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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _LINUX_FS_H
2#define _LINUX_FS_H
3
Linus Torvalds1da177e2005-04-16 15:20:36 -07004#include <linux/linkage.h>
5#include <linux/wait.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07006#include <linux/kdev_t.h>
7#include <linux/dcache.h>
Al Viro3f8206d2008-07-26 03:46:43 -04008#include <linux/path.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07009#include <linux/stat.h>
10#include <linux/cache.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/list.h>
Dave Chinnerbc3b14c2013-08-28 10:17:58 +100012#include <linux/list_lru.h>
Oleg Nesterov4f5e65a2013-07-08 14:24:16 -070013#include <linux/llist.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/radix-tree.h>
Michel Lespinasse6b2dbba2012-10-08 16:31:25 -070015#include <linux/rbtree.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/init.h>
Al Viro914e2632006-10-18 13:55:46 -040017#include <linux/pid.h>
Paul Gortmaker187f1882011-11-23 20:12:59 -050018#include <linux/bug.h>
Jes Sorensen1b1dcc12006-01-09 15:59:24 -080019#include <linux/mutex.h>
Davidlohr Buesoc8c06ef2014-12-12 16:54:24 -080020#include <linux/rwsem.h>
Satyam Sharma3bd858ab2007-07-17 15:00:08 +053021#include <linux/capability.h>
Matthew Wilcox6188e102008-04-18 22:21:05 -040022#include <linux/semaphore.h>
Mark Fashehc4b929b2008-10-08 19:44:18 -040023#include <linux/fiemap.h>
Nick Pigginceb5bdc2011-01-07 17:50:05 +110024#include <linux/rculist_bl.h>
Al Viro07b8ce12011-06-20 10:52:57 -040025#include <linux/atomic.h>
Konstantin Khlebnikov83aeead2011-12-08 14:33:54 -080026#include <linux/shrinker.h>
Stephen Rothwellc1aab022012-01-24 11:41:32 +110027#include <linux/migrate_mode.h>
Eric W. Biederman92361632012-02-08 07:07:50 -080028#include <linux/uidgid.h>
Jan Kara5accdf82012-06-12 16:20:34 +020029#include <linux/lockdep.h>
Jens Axboec2b1ad82012-09-27 09:35:03 +020030#include <linux/percpu-rwsem.h>
David Howells08cce05c2012-10-13 10:45:06 +010031#include <linux/blk_types.h>
Oleg Nesterov853b39a2015-07-22 20:21:13 +020032#include <linux/workqueue.h>
Oleg Nesterov8129ed22015-08-11 17:05:04 +020033#include <linux/percpu-rwsem.h>
Al Virofceef392015-12-29 15:58:39 -050034#include <linux/delayed_call.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include <asm/byteorder.h>
David Howells607ca462012-10-13 10:46:48 +010037#include <uapi/linux/fs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
Christoph Hellwigb83ae6d2015-01-14 10:42:37 +010039struct backing_dev_info;
Tejun Heo52ebea72015-05-22 17:13:37 -040040struct bdi_writeback;
Christoph Hellwiga5694252007-07-17 04:04:28 -070041struct export_operations;
Christoph Hellwiga885c8c2006-01-08 01:02:50 -080042struct hd_geometry;
Linus Torvalds1da177e2005-04-16 15:20:36 -070043struct iovec;
Christoph Hellwig92198f72005-06-23 22:00:59 -070044struct kiocb;
Alexey Dobriyan57cc72152011-01-10 08:18:25 +020045struct kobject;
Linus Torvalds1da177e2005-04-16 15:20:36 -070046struct pipe_inode_info;
47struct poll_table_struct;
48struct kstatfs;
49struct vm_area_struct;
50struct vfsmount;
David Howells745ca242008-11-14 10:39:22 +110051struct cred;
Mel Gormana509bc12012-07-31 16:44:57 -070052struct swap_info_struct;
Cyrill Gorcunov55985dd2012-12-17 16:04:55 -080053struct seq_file;
Christoph Hellwig7b7a8662013-09-04 15:04:39 +020054struct workqueue_struct;
Al Viro3b93f912014-02-11 21:34:08 -050055struct iov_iter;
Jaegeuk Kim0b81d072015-05-15 16:26:10 -070056struct fscrypt_info;
57struct fscrypt_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
Denis Cheng74bf17c2007-10-16 23:26:30 -070059extern void __init inode_init(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -070060extern void __init inode_init_early(void);
Mel Gorman4248b0d2015-08-06 15:46:20 -070061extern void __init files_init(void);
62extern void __init files_maxfiles_init(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
Jan Engelhardtdded4f42008-12-01 14:34:50 -080064extern struct files_stat_struct files_stat;
Eric Dumazet518de9b2010-10-26 14:22:44 -070065extern unsigned long get_max_files(void);
Jan Engelhardtdded4f42008-12-01 14:34:50 -080066extern int sysctl_nr_open;
67extern struct inodes_stat_t inodes_stat;
68extern int leases_enable, lease_break_time;
Kees Cook800179c2012-07-25 17:29:07 -070069extern int sysctl_protected_symlinks;
70extern int sysctl_protected_hardlinks;
Jan Engelhardtdded4f42008-12-01 14:34:50 -080071
Linus Torvalds1da177e2005-04-16 15:20:36 -070072struct buffer_head;
73typedef int (get_block_t)(struct inode *inode, sector_t iblock,
74 struct buffer_head *bh_result, int create);
Christoph Hellwig187372a2016-02-08 14:40:51 +110075typedef int (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
Christoph Hellwig7b7a8662013-09-04 15:04:39 +020076 ssize_t bytes, void *private);
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
David Howellsbbc10962012-10-15 16:40:35 +010078#define MAY_EXEC 0x00000001
79#define MAY_WRITE 0x00000002
80#define MAY_READ 0x00000004
81#define MAY_APPEND 0x00000008
82#define MAY_ACCESS 0x00000010
83#define MAY_OPEN 0x00000020
84#define MAY_CHDIR 0x00000040
85/* called from RCU mode, don't block */
86#define MAY_NOT_BLOCK 0x00000080
87
88/*
89 * flags in file.f_mode. Note that FMODE_READ and FMODE_WRITE must correspond
90 * to O_WRONLY and O_RDWR via the strange trick in __dentry_open()
91 */
92
93/* file is open for reading */
94#define FMODE_READ ((__force fmode_t)0x1)
95/* file is open for writing */
96#define FMODE_WRITE ((__force fmode_t)0x2)
97/* file is seekable */
98#define FMODE_LSEEK ((__force fmode_t)0x4)
99/* file can be accessed using pread */
100#define FMODE_PREAD ((__force fmode_t)0x8)
101/* file can be accessed using pwrite */
102#define FMODE_PWRITE ((__force fmode_t)0x10)
103/* File is opened for execution with sys_execve / sys_uselib */
104#define FMODE_EXEC ((__force fmode_t)0x20)
105/* File is opened with O_NDELAY (only set for block devices) */
106#define FMODE_NDELAY ((__force fmode_t)0x40)
107/* File is opened with O_EXCL (only set for block devices) */
108#define FMODE_EXCL ((__force fmode_t)0x80)
109/* File is opened using open(.., 3, ..) and is writeable only for ioctls
110 (specialy hack for floppy.c) */
111#define FMODE_WRITE_IOCTL ((__force fmode_t)0x100)
112/* 32bit hashes as llseek() offset (for directories) */
113#define FMODE_32BITHASH ((__force fmode_t)0x200)
114/* 64bit hashes as llseek() offset (for directories) */
115#define FMODE_64BITHASH ((__force fmode_t)0x400)
116
117/*
118 * Don't update ctime and mtime.
119 *
120 * Currently a special hack for the XFS open_by_handle ioctl, but we'll
121 * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon.
122 */
123#define FMODE_NOCMTIME ((__force fmode_t)0x800)
124
125/* Expect random access pattern */
126#define FMODE_RANDOM ((__force fmode_t)0x1000)
127
128/* File is huge (eg. /dev/kmem): treat loff_t as unsigned */
129#define FMODE_UNSIGNED_OFFSET ((__force fmode_t)0x2000)
130
131/* File is opened with O_PATH; almost nothing can be done with it */
132#define FMODE_PATH ((__force fmode_t)0x4000)
133
Linus Torvalds9c225f22014-03-03 09:36:58 -0800134/* File needs atomic accesses to f_pos */
135#define FMODE_ATOMIC_POS ((__force fmode_t)0x8000)
Al Viro83f936c2014-03-14 12:02:47 -0400136/* Write access to underlying fs */
137#define FMODE_WRITER ((__force fmode_t)0x10000)
Al Viro7f7f25e2014-02-11 17:49:24 -0500138/* Has read method(s) */
139#define FMODE_CAN_READ ((__force fmode_t)0x20000)
140/* Has write method(s) */
141#define FMODE_CAN_WRITE ((__force fmode_t)0x40000)
Linus Torvalds9c225f22014-03-03 09:36:58 -0800142
David Howellsbbc10962012-10-15 16:40:35 +0100143/* File was opened by fanotify and shouldn't generate fanotify events */
David Drysdale75069f22015-01-08 14:32:29 -0800144#define FMODE_NONOTIFY ((__force fmode_t)0x4000000)
David Howellsbbc10962012-10-15 16:40:35 +0100145
146/*
147 * Flag for rw_copy_check_uvector and compat_rw_copy_check_uvector
148 * that indicates that they should check the contents of the iovec are
149 * valid, but not check the memory that the iovec elements
150 * points too.
151 */
152#define CHECK_IOVEC_ONLY -1
153
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154/*
David Howells08cce05c2012-10-13 10:45:06 +0100155 * The below are the various read and write types that we support. Some of
156 * them include behavioral modifiers that send information down to the
157 * block layer and IO scheduler. Terminology:
158 *
159 * The block layer uses device plugging to defer IO a little bit, in
160 * the hope that we will see more IO very shortly. This increases
161 * coalescing of adjacent IO and thus reduces the number of IOs we
162 * have to send to the device. It also allows for better queuing,
163 * if the IO isn't mergeable. If the caller is going to be waiting
164 * for the IO, then he must ensure that the device is unplugged so
165 * that the IO is dispatched to the driver.
166 *
167 * All IO is handled async in Linux. This is fine for background
168 * writes, but for reads or writes that someone waits for completion
169 * on, we want to notify the block layer and IO scheduler so that they
170 * know about it. That allows them to make better scheduling
171 * decisions. So when the below references 'sync' and 'async', it
172 * is referencing this priority hint.
173 *
174 * With that in mind, the available types are:
175 *
176 * READ A normal read operation. Device will be plugged.
177 * READ_SYNC A synchronous read. Device is not plugged, caller can
178 * immediately wait on this read without caring about
179 * unplugging.
180 * READA Used for read-ahead operations. Lower priority, and the
181 * block layer could (in theory) choose to ignore this
182 * request if it runs into resource problems.
183 * WRITE A normal async write. Device will be plugged.
184 * WRITE_SYNC Synchronous write. Identical to WRITE, but passes down
185 * the hint that someone will be waiting on this IO
186 * shortly. The write equivalent of READ_SYNC.
187 * WRITE_ODIRECT Special case write for O_DIRECT only.
188 * WRITE_FLUSH Like WRITE_SYNC but with preceding cache flush.
189 * WRITE_FUA Like WRITE_SYNC but data is guaranteed to be on
190 * non-volatile media on completion.
191 * WRITE_FLUSH_FUA Combination of WRITE_FLUSH and FUA. The IO is preceded
192 * by a cache flush and data is guaranteed to be on
193 * non-volatile media on completion.
194 *
195 */
196#define RW_MASK REQ_WRITE
197#define RWA_MASK REQ_RAHEAD
198
199#define READ 0
200#define WRITE RW_MASK
201#define READA RWA_MASK
David Howells08cce05c2012-10-13 10:45:06 +0100202
203#define READ_SYNC (READ | REQ_SYNC)
204#define WRITE_SYNC (WRITE | REQ_SYNC | REQ_NOIDLE)
205#define WRITE_ODIRECT (WRITE | REQ_SYNC)
206#define WRITE_FLUSH (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH)
207#define WRITE_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FUA)
208#define WRITE_FLUSH_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH | REQ_FUA)
209
210/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 * Attribute flags. These should be or-ed together to figure out what
212 * has been changed!
213 */
Miklos Szeredi9767d742008-07-01 15:01:26 +0200214#define ATTR_MODE (1 << 0)
215#define ATTR_UID (1 << 1)
216#define ATTR_GID (1 << 2)
217#define ATTR_SIZE (1 << 3)
218#define ATTR_ATIME (1 << 4)
219#define ATTR_MTIME (1 << 5)
220#define ATTR_CTIME (1 << 6)
221#define ATTR_ATIME_SET (1 << 7)
222#define ATTR_MTIME_SET (1 << 8)
223#define ATTR_FORCE (1 << 9) /* Not a change, but a change it */
224#define ATTR_ATTR_FLAG (1 << 10)
225#define ATTR_KILL_SUID (1 << 11)
226#define ATTR_KILL_SGID (1 << 12)
227#define ATTR_FILE (1 << 13)
228#define ATTR_KILL_PRIV (1 << 14)
229#define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */
230#define ATTR_TIMES_SET (1 << 16)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231
232/*
Miklos Szeredi787fb6b2014-10-24 00:14:36 +0200233 * Whiteout is represented by a char device. The following constants define the
234 * mode and device number to use.
235 */
236#define WHITEOUT_MODE 0
237#define WHITEOUT_DEV 0
238
239/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 * This is the Inode Attributes structure, used for notify_change(). It
241 * uses the above definitions as flags, to know which values have changed.
242 * Also, in this manner, a Filesystem can look at only the values it cares
243 * about. Basically, these are the attributes that the VFS layer can
244 * request to change from the FS layer.
245 *
246 * Derek Atkins <warlord@MIT.EDU> 94-10-20
247 */
248struct iattr {
249 unsigned int ia_valid;
250 umode_t ia_mode;
Eric W. Biederman92361632012-02-08 07:07:50 -0800251 kuid_t ia_uid;
252 kgid_t ia_gid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 loff_t ia_size;
254 struct timespec ia_atime;
255 struct timespec ia_mtime;
256 struct timespec ia_ctime;
Miklos Szeredicc4e69d2005-11-07 00:59:49 -0800257
258 /*
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300259 * Not an attribute, but an auxiliary info for filesystems wanting to
Miklos Szeredicc4e69d2005-11-07 00:59:49 -0800260 * implement an ftruncate() like method. NOTE: filesystem should
261 * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
262 */
263 struct file *ia_file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264};
265
266/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 * Includes for diskquotas.
268 */
269#include <linux/quota.h>
270
Miklos Szeredi69c433e2014-10-24 00:14:39 +0200271/*
272 * Maximum number of layers of fs stack. Needs to be limited to
273 * prevent kernel stack overflow
274 */
275#define FILESYSTEM_MAX_STACK_DEPTH 2
276
Zach Brown994fc28c2005-12-15 14:28:17 -0800277/**
278 * enum positive_aop_returns - aop return codes with specific semantics
279 *
280 * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
281 * completed, that the page is still locked, and
282 * should be considered active. The VM uses this hint
283 * to return the page to the active list -- it won't
284 * be a candidate for writeback again in the near
285 * future. Other callers must be careful to unlock
286 * the page if they get this return. Returned by
287 * writepage();
288 *
289 * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
290 * unlocked it and the page might have been truncated.
291 * The caller should back up to acquiring a new page and
292 * trying again. The aop will be taking reasonable
293 * precautions not to livelock. If the caller held a page
294 * reference, it should drop it before retrying. Returned
Nick Piggin55144762007-10-16 01:25:26 -0700295 * by readpage().
Zach Brown994fc28c2005-12-15 14:28:17 -0800296 *
297 * address_space_operation functions return these large constants to indicate
298 * special semantics to the caller. These are much larger than the bytes in a
299 * page to allow for functions that return the number of bytes operated on in a
300 * given page.
301 */
302
303enum positive_aop_returns {
304 AOP_WRITEPAGE_ACTIVATE = 0x80000,
305 AOP_TRUNCATED_PAGE = 0x80001,
306};
307
Nick Pigginafddba42007-10-16 01:25:01 -0700308#define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */
Nick Piggin89e10782007-10-16 01:25:07 -0700309#define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */
Nick Piggin54566b22009-01-04 12:00:53 -0800310#define AOP_FLAG_NOFS 0x0004 /* used by filesystem to direct
311 * helper code (eg buffer layer)
312 * to clear GFP_FS from alloc */
Nick Pigginafddba42007-10-16 01:25:01 -0700313
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314/*
315 * oh the beauties of C type declarations.
316 */
317struct page;
318struct address_space;
319struct writeback_control;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320
Christoph Hellwige2e40f22015-02-22 08:58:50 -0800321#define IOCB_EVENTFD (1 << 0)
Al Viro2ba48ce2015-04-09 13:52:01 -0400322#define IOCB_APPEND (1 << 1)
323#define IOCB_DIRECT (1 << 2)
Christoph Hellwig97be7eb2016-03-03 16:04:01 +0100324#define IOCB_HIPRI (1 << 3)
Christoph Hellwigdde0c2e2016-04-07 08:52:00 -0700325#define IOCB_DSYNC (1 << 4)
326#define IOCB_SYNC (1 << 5)
Christoph Hellwige2e40f22015-02-22 08:58:50 -0800327
328struct kiocb {
329 struct file *ki_filp;
330 loff_t ki_pos;
331 void (*ki_complete)(struct kiocb *iocb, long ret, long ret2);
332 void *private;
333 int ki_flags;
334};
335
336static inline bool is_sync_kiocb(struct kiocb *kiocb)
337{
338 return kiocb->ki_complete == NULL;
339}
340
Al Viro2ba48ce2015-04-09 13:52:01 -0400341static inline int iocb_flags(struct file *file);
342
Christoph Hellwige2e40f22015-02-22 08:58:50 -0800343static inline void init_sync_kiocb(struct kiocb *kiocb, struct file *filp)
344{
345 *kiocb = (struct kiocb) {
346 .ki_filp = filp,
Al Viro2ba48ce2015-04-09 13:52:01 -0400347 .ki_flags = iocb_flags(filp),
Christoph Hellwige2e40f22015-02-22 08:58:50 -0800348 };
349}
350
Hisashi Hifumi8ab22b92008-07-28 15:46:36 -0700351/*
352 * "descriptor" for what we're up to with a read.
353 * This allows us to use the same read code yet
354 * have multiple different users of the data that
355 * we read from a file.
356 *
357 * The simplest case just copies the data to user
358 * mode.
359 */
360typedef struct {
361 size_t written;
362 size_t count;
363 union {
364 char __user *buf;
365 void *data;
366 } arg;
367 int error;
368} read_descriptor_t;
369
370typedef int (*read_actor_t)(read_descriptor_t *, struct page *,
371 unsigned long, unsigned long);
Nick Piggin2f718ff2007-10-16 01:24:59 -0700372
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373struct address_space_operations {
374 int (*writepage)(struct page *page, struct writeback_control *wbc);
375 int (*readpage)(struct file *, struct page *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376
377 /* Write back some dirty pages from this mapping. */
378 int (*writepages)(struct address_space *, struct writeback_control *);
379
Andrew Morton4741c9f2006-03-24 03:18:11 -0800380 /* Set a page dirty. Return true if this dirtied it */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 int (*set_page_dirty)(struct page *page);
382
383 int (*readpages)(struct file *filp, struct address_space *mapping,
384 struct list_head *pages, unsigned nr_pages);
385
Nick Pigginafddba42007-10-16 01:25:01 -0700386 int (*write_begin)(struct file *, struct address_space *mapping,
387 loff_t pos, unsigned len, unsigned flags,
388 struct page **pagep, void **fsdata);
389 int (*write_end)(struct file *, struct address_space *mapping,
390 loff_t pos, unsigned len, unsigned copied,
391 struct page *page, void *fsdata);
392
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
394 sector_t (*bmap)(struct address_space *, sector_t);
Lukas Czernerd47992f2013-05-21 23:17:23 -0400395 void (*invalidatepage) (struct page *, unsigned int, unsigned int);
Al Viro27496a82005-10-21 03:20:48 -0400396 int (*releasepage) (struct page *, gfp_t);
Linus Torvalds6072d132010-12-01 13:35:19 -0500397 void (*freepage)(struct page *);
Christoph Hellwigc8b8e322016-04-07 08:51:58 -0700398 ssize_t (*direct_IO)(struct kiocb *, struct iov_iter *iter);
Mel Gormanb969c4ab2012-01-12 17:19:34 -0800399 /*
Tang Chenef277c72013-07-08 16:00:21 -0700400 * migrate the contents of a page to the specified target. If
401 * migrate_mode is MIGRATE_ASYNC, it must not block.
Mel Gormanb969c4ab2012-01-12 17:19:34 -0800402 */
Christoph Lameter2d1db3b2006-06-23 02:03:33 -0700403 int (*migratepage) (struct address_space *,
Mel Gormana6bc32b2012-01-12 17:19:43 -0800404 struct page *, struct page *, enum migrate_mode);
Trond Myklebuste3db7692007-01-10 23:15:39 -0800405 int (*launder_page) (struct page *);
Al Viroc186afb42014-02-02 21:16:54 -0500406 int (*is_partially_uptodate) (struct page *, unsigned long,
Hisashi Hifumi8ab22b92008-07-28 15:46:36 -0700407 unsigned long);
Mel Gormanb4597222013-07-03 15:02:05 -0700408 void (*is_dirty_writeback) (struct page *, bool *, bool *);
Andi Kleen25718732009-09-16 11:50:13 +0200409 int (*error_remove_page)(struct address_space *, struct page *);
Mel Gorman62c230b2012-07-31 16:44:55 -0700410
411 /* swapfile support */
Mel Gormana509bc12012-07-31 16:44:57 -0700412 int (*swap_activate)(struct swap_info_struct *sis, struct file *file,
413 sector_t *span);
414 void (*swap_deactivate)(struct file *file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415};
416
Jens Axboe7dcda1c2011-04-05 23:51:48 +0200417extern const struct address_space_operations empty_aops;
418
Nick Pigginafddba42007-10-16 01:25:01 -0700419/*
420 * pagecache_write_begin/pagecache_write_end must be used by general code
421 * to write into the pagecache.
422 */
423int pagecache_write_begin(struct file *, struct address_space *mapping,
424 loff_t pos, unsigned len, unsigned flags,
425 struct page **pagep, void **fsdata);
426
427int pagecache_write_end(struct file *, struct address_space *mapping,
428 loff_t pos, unsigned len, unsigned copied,
429 struct page *page, void *fsdata);
430
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431struct address_space {
432 struct inode *host; /* owner: inode, block_device */
433 struct radix_tree_root page_tree; /* radix tree of all pages */
Nick Piggin19fd6232008-07-25 19:45:32 -0700434 spinlock_t tree_lock; /* and lock protecting it */
David Herrmann4bb5f5d2014-08-08 14:25:25 -0700435 atomic_t i_mmap_writable;/* count VM_SHARED mappings */
Michel Lespinasse6b2dbba2012-10-08 16:31:25 -0700436 struct rb_root i_mmap; /* tree of private and shared mappings */
Davidlohr Buesoc8c06ef2014-12-12 16:54:24 -0800437 struct rw_semaphore i_mmap_rwsem; /* protect tree, count, list */
Jan Kara08142572011-06-27 16:18:10 -0700438 /* Protected by tree_lock together with the radix tree */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 unsigned long nrpages; /* number of total pages */
Ross Zwislerf9fe48b2016-01-22 15:10:40 -0800440 /* number of shadow or DAX exceptional entries */
441 unsigned long nrexceptional;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 pgoff_t writeback_index;/* writeback starts here */
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700443 const struct address_space_operations *a_ops; /* methods */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 unsigned long flags; /* error bits/gfp mask */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 spinlock_t private_lock; /* for use by the address_space */
446 struct list_head private_list; /* ditto */
Rafael Aquini252aa6f2012-12-11 16:02:35 -0800447 void *private_data; /* ditto */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448} __attribute__((aligned(sizeof(long))));
449 /*
450 * On most architectures that alignment is already the case; but
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300451 * must be enforced here for CRIS, to let the least significant bit
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
453 */
Andi Kleen87192a22012-01-12 17:20:34 -0800454struct request_queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455
456struct block_device {
457 dev_t bd_dev; /* not a kdev_t - it's a search key */
Richard Kennedyf3ccfcd2011-03-22 16:33:56 -0700458 int bd_openers;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 struct inode * bd_inode; /* will die */
Theodore Ts'o87d8fe12009-01-03 09:47:09 -0500460 struct super_block * bd_super;
Arjan van de Venc039e312006-03-23 03:00:28 -0800461 struct mutex bd_mutex; /* open/close mutex */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 struct list_head bd_inodes;
Tejun Heo6b4517a2010-04-07 18:53:59 +0900463 void * bd_claiming;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 void * bd_holder;
465 int bd_holders;
Tejun Heo77ea8872010-12-08 20:57:37 +0100466 bool bd_write_holder;
Jun'ichi Nomura641dc632006-03-27 01:17:57 -0800467#ifdef CONFIG_SYSFS
Tejun Heo49731ba2011-01-14 18:43:57 +0100468 struct list_head bd_holder_disks;
Jun'ichi Nomura641dc632006-03-27 01:17:57 -0800469#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 struct block_device * bd_contains;
471 unsigned bd_block_size;
472 struct hd_struct * bd_part;
473 /* number of times partitions within this device have been opened. */
474 unsigned bd_part_count;
475 int bd_invalidated;
476 struct gendisk * bd_disk;
Andi Kleen87192a22012-01-12 17:20:34 -0800477 struct request_queue * bd_queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 struct list_head bd_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 /*
480 * Private data. You must have bd_claim'ed the block_device
481 * to use this. NOTE: bd_claim allows an owner to claim
482 * the same device multiple times, the owner must take special
483 * care to not mess up bd_private for that case.
484 */
485 unsigned long bd_private;
Takashi Satofcccf502009-01-09 16:40:59 -0800486
487 /* The counter of freeze processes */
488 int bd_fsfreeze_count;
489 /* Mutex for freeze */
490 struct mutex bd_fsfreeze_mutex;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491};
492
493/*
494 * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
495 * radix trees
496 */
497#define PAGECACHE_TAG_DIRTY 0
498#define PAGECACHE_TAG_WRITEBACK 1
Jan Karaf446daae2010-08-09 17:19:12 -0700499#define PAGECACHE_TAG_TOWRITE 2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500
501int mapping_tagged(struct address_space *mapping, int tag);
502
Davidlohr Bueso8b28f622014-12-12 16:54:18 -0800503static inline void i_mmap_lock_write(struct address_space *mapping)
504{
Davidlohr Buesoc8c06ef2014-12-12 16:54:24 -0800505 down_write(&mapping->i_mmap_rwsem);
Davidlohr Bueso8b28f622014-12-12 16:54:18 -0800506}
507
508static inline void i_mmap_unlock_write(struct address_space *mapping)
509{
Davidlohr Buesoc8c06ef2014-12-12 16:54:24 -0800510 up_write(&mapping->i_mmap_rwsem);
Davidlohr Bueso8b28f622014-12-12 16:54:18 -0800511}
512
Davidlohr Bueso3dec0ba2014-12-12 16:54:27 -0800513static inline void i_mmap_lock_read(struct address_space *mapping)
514{
515 down_read(&mapping->i_mmap_rwsem);
516}
517
518static inline void i_mmap_unlock_read(struct address_space *mapping)
519{
520 up_read(&mapping->i_mmap_rwsem);
521}
522
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523/*
524 * Might pages of this file be mapped into userspace?
525 */
526static inline int mapping_mapped(struct address_space *mapping)
527{
Kirill A. Shutemov27ba0642015-02-10 14:09:59 -0800528 return !RB_EMPTY_ROOT(&mapping->i_mmap);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529}
530
531/*
532 * Might pages of this file have been modified in userspace?
533 * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
534 * marks vma as VM_SHARED if it is shared, and the file was opened for
535 * writing i.e. vma may be mprotected writable even if now readonly.
David Herrmann4bb5f5d2014-08-08 14:25:25 -0700536 *
537 * If i_mmap_writable is negative, no new writable mappings are allowed. You
538 * can only deny writable mappings, if none exists right now.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 */
540static inline int mapping_writably_mapped(struct address_space *mapping)
541{
David Herrmann4bb5f5d2014-08-08 14:25:25 -0700542 return atomic_read(&mapping->i_mmap_writable) > 0;
543}
544
545static inline int mapping_map_writable(struct address_space *mapping)
546{
547 return atomic_inc_unless_negative(&mapping->i_mmap_writable) ?
548 0 : -EPERM;
549}
550
551static inline void mapping_unmap_writable(struct address_space *mapping)
552{
553 atomic_dec(&mapping->i_mmap_writable);
554}
555
556static inline int mapping_deny_writable(struct address_space *mapping)
557{
558 return atomic_dec_unless_positive(&mapping->i_mmap_writable) ?
559 0 : -EBUSY;
560}
561
562static inline void mapping_allow_writable(struct address_space *mapping)
563{
564 atomic_inc(&mapping->i_mmap_writable);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565}
566
567/*
568 * Use sequence counter to get consistent i_size on 32-bit processors.
569 */
570#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
571#include <linux/seqlock.h>
572#define __NEED_I_SIZE_ORDERED
573#define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
574#else
575#define i_size_ordered_init(inode) do { } while (0)
576#endif
577
Al Virof19d4a82009-06-08 19:50:45 -0400578struct posix_acl;
579#define ACL_NOT_CACHED ((void *)(-1))
580
Andreas Gruenbacherb8a7a3a2016-03-24 14:38:37 +0100581static inline struct posix_acl *
582uncached_acl_sentinel(struct task_struct *task)
583{
584 return (void *)task + 1;
585}
586
587static inline bool
588is_uncached_acl(struct posix_acl *acl)
589{
590 return (long)acl & 1;
591}
592
Linus Torvalds3ddcd052011-08-06 22:45:50 -0700593#define IOP_FASTPERM 0x0001
594#define IOP_LOOKUP 0x0002
595#define IOP_NOFOLLOW 0x0004
596
597/*
598 * Keep mostly read-only and often accessed (especially for
599 * the RCU path lookup and 'stat' data) fields at the beginning
600 * of the 'struct inode'
601 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602struct inode {
Nick Piggin44a7d7a2011-01-07 17:49:56 +1100603 umode_t i_mode;
Linus Torvalds3ddcd052011-08-06 22:45:50 -0700604 unsigned short i_opflags;
Eric W. Biederman92361632012-02-08 07:07:50 -0800605 kuid_t i_uid;
606 kgid_t i_gid;
Linus Torvalds3ddcd052011-08-06 22:45:50 -0700607 unsigned int i_flags;
608
609#ifdef CONFIG_FS_POSIX_ACL
610 struct posix_acl *i_acl;
611 struct posix_acl *i_default_acl;
612#endif
613
Nick Piggin44a7d7a2011-01-07 17:49:56 +1100614 const struct inode_operations *i_op;
615 struct super_block *i_sb;
Linus Torvalds3ddcd052011-08-06 22:45:50 -0700616 struct address_space *i_mapping;
Nick Piggin44a7d7a2011-01-07 17:49:56 +1100617
Linus Torvalds13e12d12011-06-08 15:18:19 -0700618#ifdef CONFIG_SECURITY
619 void *i_security;
620#endif
Nick Piggin44a7d7a2011-01-07 17:49:56 +1100621
Linus Torvalds3ddcd052011-08-06 22:45:50 -0700622 /* Stat data, not accessed from path walking */
623 unsigned long i_ino;
Miklos Szeredia78ef702011-10-28 14:13:30 +0200624 /*
625 * Filesystems may only read i_nlink directly. They shall use the
626 * following functions for modification:
627 *
628 * (set|clear|inc|drop)_nlink
629 * inode_(inc|dec)_link_count
630 */
631 union {
632 const unsigned int i_nlink;
633 unsigned int __i_nlink;
634 };
Linus Torvalds3ddcd052011-08-06 22:45:50 -0700635 dev_t i_rdev;
Linus Torvalds2f9d3df2012-06-03 14:50:19 -0700636 loff_t i_size;
Linus Torvalds3ddcd052011-08-06 22:45:50 -0700637 struct timespec i_atime;
638 struct timespec i_mtime;
639 struct timespec i_ctime;
Theodore Ts'o6cdbb0e2011-10-29 08:24:18 -0400640 spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */
641 unsigned short i_bytes;
Linus Torvalds2f9d3df2012-06-03 14:50:19 -0700642 unsigned int i_blkbits;
Linus Torvalds3ddcd052011-08-06 22:45:50 -0700643 blkcnt_t i_blocks;
644
645#ifdef __NEED_I_SIZE_ORDERED
646 seqcount_t i_size_seqcount;
647#endif
648
649 /* Misc */
650 unsigned long i_state;
Al Viro9902af72016-04-15 15:08:36 -0400651 struct rw_semaphore i_rwsem;
Linus Torvalds13e12d12011-06-08 15:18:19 -0700652
Nick Piggin44a7d7a2011-01-07 17:49:56 +1100653 unsigned long dirtied_when; /* jiffies of first dirtying */
Theodore Ts'oa2f48702015-03-17 12:23:19 -0400654 unsigned long dirtied_time_when;
Nick Piggin44a7d7a2011-01-07 17:49:56 +1100655
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656 struct hlist_node i_hash;
Dave Chinnerc7f54082015-03-04 14:07:22 -0500657 struct list_head i_io_list; /* backing dev IO list */
Tejun Heo52ebea72015-05-22 17:13:37 -0400658#ifdef CONFIG_CGROUP_WRITEBACK
659 struct bdi_writeback *i_wb; /* the associated cgroup wb */
Tejun Heo2a814902015-05-28 14:50:51 -0400660
661 /* foreign inode detection, see wbc_detach_inode() */
662 int i_wb_frn_winner;
663 u16 i_wb_frn_avg_time;
664 u16 i_wb_frn_history;
Tejun Heo52ebea72015-05-22 17:13:37 -0400665#endif
Nick Piggin7ccf19a2010-10-21 11:49:30 +1100666 struct list_head i_lru; /* inode LRU list */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667 struct list_head i_sb_list;
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100668 union {
Al Virob3d9b7a2012-06-09 13:51:19 -0400669 struct hlist_head i_dentry;
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100670 struct rcu_head i_rcu;
671 };
Jean Noel Cordenner7a224222008-01-28 23:58:27 -0500672 u64 i_version;
Linus Torvalds2f9d3df2012-06-03 14:50:19 -0700673 atomic_t i_count;
Christoph Hellwigbd5fe6c2011-06-24 14:29:43 -0400674 atomic_t i_dio_count;
Theodore Ts'o6cdbb0e2011-10-29 08:24:18 -0400675 atomic_t i_writecount;
Mimi Zohard984ea62013-12-11 15:20:54 -0500676#ifdef CONFIG_IMA
677 atomic_t i_readcount; /* struct files open RO */
678#endif
Arjan van de Ven99ac48f2006-03-28 01:56:41 -0800679 const struct file_operations *i_fop; /* former ->i_op->default_file_ops */
Jeff Layton4a075e32015-01-16 15:05:54 -0500680 struct file_lock_context *i_flctx;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681 struct address_space i_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682 struct list_head i_devices;
Theodore Ts'o4c154162006-09-27 01:50:47 -0700683 union {
684 struct pipe_inode_info *i_pipe;
Theodore Ts'oeaf796e2006-09-27 01:50:48 -0700685 struct block_device *i_bdev;
Theodore Ts'o577c4eb2006-09-27 01:50:49 -0700686 struct cdev *i_cdev;
Al Viro61ba64f2015-05-02 09:54:06 -0400687 char *i_link;
Al Viro84e710d2016-04-15 00:58:55 -0400688 unsigned i_dir_seq;
Theodore Ts'o4c154162006-09-27 01:50:47 -0700689 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690
691 __u32 i_generation;
692
Eric Paris3be25f42009-05-21 17:01:26 -0400693#ifdef CONFIG_FSNOTIFY
694 __u32 i_fsnotify_mask; /* all events this inode cares about */
Eric Parise61ce862009-12-17 21:24:24 -0500695 struct hlist_head i_fsnotify_marks;
Robert Love0eeca282005-07-12 17:06:03 -0400696#endif
697
Jaegeuk Kim0b81d072015-05-15 16:26:10 -0700698#if IS_ENABLED(CONFIG_FS_ENCRYPTION)
699 struct fscrypt_info *i_crypt_info;
700#endif
701
Theodore Ts'o8e18e292006-09-27 01:50:46 -0700702 void *i_private; /* fs or device private pointer */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703};
704
Al Viro1d3382cb2010-10-23 15:19:20 -0400705static inline int inode_unhashed(struct inode *inode)
706{
707 return hlist_unhashed(&inode->i_hash);
708}
709
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710/*
Ingo Molnarf2eace22006-07-03 00:25:05 -0700711 * inode->i_mutex nesting subclasses for the lock validator:
712 *
713 * 0: the object of the current VFS operation
714 * 1: parent
715 * 2: child/target
J. Bruce Fields40bd22c2012-04-18 15:21:34 -0400716 * 3: xattr
717 * 4: second non-directory
Miklos Szeredid1b72cc2014-10-27 15:42:01 +0100718 * 5: second parent (when locking independent directories in rename)
719 *
720 * I_MUTEX_NONDIR2 is for certain operations (such as rename) which lock two
J. Bruce Fields40bd22c2012-04-18 15:21:34 -0400721 * non-directories at once.
Ingo Molnarf2eace22006-07-03 00:25:05 -0700722 *
723 * The locking order between these classes is
Miklos Szeredid1b72cc2014-10-27 15:42:01 +0100724 * parent[2] -> child -> grandchild -> normal -> xattr -> second non-directory
Ingo Molnarf2eace22006-07-03 00:25:05 -0700725 */
726enum inode_i_mutex_lock_class
727{
728 I_MUTEX_NORMAL,
729 I_MUTEX_PARENT,
730 I_MUTEX_CHILD,
Ingo Molnar4df46242006-08-27 01:23:56 -0700731 I_MUTEX_XATTR,
Miklos Szeredid1b72cc2014-10-27 15:42:01 +0100732 I_MUTEX_NONDIR2,
733 I_MUTEX_PARENT2,
Ingo Molnarf2eace22006-07-03 00:25:05 -0700734};
735
Al Viro59551022016-01-22 15:40:57 -0500736static inline void inode_lock(struct inode *inode)
737{
Al Viro9902af72016-04-15 15:08:36 -0400738 down_write(&inode->i_rwsem);
Al Viro59551022016-01-22 15:40:57 -0500739}
740
741static inline void inode_unlock(struct inode *inode)
742{
Al Viro9902af72016-04-15 15:08:36 -0400743 up_write(&inode->i_rwsem);
744}
745
746static inline void inode_lock_shared(struct inode *inode)
747{
748 down_read(&inode->i_rwsem);
749}
750
751static inline void inode_unlock_shared(struct inode *inode)
752{
753 up_read(&inode->i_rwsem);
Al Viro59551022016-01-22 15:40:57 -0500754}
755
756static inline int inode_trylock(struct inode *inode)
757{
Al Viro9902af72016-04-15 15:08:36 -0400758 return down_write_trylock(&inode->i_rwsem);
759}
760
761static inline int inode_trylock_shared(struct inode *inode)
762{
763 return down_read_trylock(&inode->i_rwsem);
Al Viro59551022016-01-22 15:40:57 -0500764}
765
766static inline int inode_is_locked(struct inode *inode)
767{
Al Viro9902af72016-04-15 15:08:36 -0400768 return rwsem_is_locked(&inode->i_rwsem);
Al Viro59551022016-01-22 15:40:57 -0500769}
770
771static inline void inode_lock_nested(struct inode *inode, unsigned subclass)
772{
Al Viro9902af72016-04-15 15:08:36 -0400773 down_write_nested(&inode->i_rwsem, subclass);
Al Viro59551022016-01-22 15:40:57 -0500774}
775
J. Bruce Fields375e2892012-04-18 15:16:33 -0400776void lock_two_nondirectories(struct inode *, struct inode*);
777void unlock_two_nondirectories(struct inode *, struct inode*);
778
Ingo Molnarf2eace22006-07-03 00:25:05 -0700779/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780 * NOTE: in a 32bit arch with a preemptable kernel and
781 * an UP compile the i_size_read/write must be atomic
782 * with respect to the local cpu (unlike with preempt disabled),
783 * but they don't need to be atomic with respect to other cpus like in
784 * true SMP (so they need either to either locally disable irq around
785 * the read or for example on x86 they can be still implemented as a
786 * cmpxchg8b without the need of the lock prefix). For SMP compiles
787 * and 64bit archs it makes no difference if preempt is enabled or not.
788 */
Jan Engelhardt48ed2142006-12-06 20:35:37 -0800789static inline loff_t i_size_read(const struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790{
791#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
792 loff_t i_size;
793 unsigned int seq;
794
795 do {
796 seq = read_seqcount_begin(&inode->i_size_seqcount);
797 i_size = inode->i_size;
798 } while (read_seqcount_retry(&inode->i_size_seqcount, seq));
799 return i_size;
800#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
801 loff_t i_size;
802
803 preempt_disable();
804 i_size = inode->i_size;
805 preempt_enable();
806 return i_size;
807#else
808 return inode->i_size;
809#endif
810}
811
Miklos Szeredi7762f5a2006-10-17 00:10:07 -0700812/*
813 * NOTE: unlike i_size_read(), i_size_write() does need locking around it
814 * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
815 * can be lost, resulting in subsequent i_size_read() calls spinning forever.
816 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817static inline void i_size_write(struct inode *inode, loff_t i_size)
818{
819#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
Fan Du74e3d1e2013-04-30 15:27:27 -0700820 preempt_disable();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821 write_seqcount_begin(&inode->i_size_seqcount);
822 inode->i_size = i_size;
823 write_seqcount_end(&inode->i_size_seqcount);
Fan Du74e3d1e2013-04-30 15:27:27 -0700824 preempt_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
826 preempt_disable();
827 inode->i_size = i_size;
828 preempt_enable();
829#else
830 inode->i_size = i_size;
831#endif
832}
833
Eric W. Biederman92361632012-02-08 07:07:50 -0800834/* Helper functions so that in most cases filesystems will
835 * not need to deal directly with kuid_t and kgid_t and can
836 * instead deal with the raw numeric values that are stored
837 * in the filesystem.
838 */
839static inline uid_t i_uid_read(const struct inode *inode)
840{
841 return from_kuid(&init_user_ns, inode->i_uid);
842}
843
844static inline gid_t i_gid_read(const struct inode *inode)
845{
846 return from_kgid(&init_user_ns, inode->i_gid);
847}
848
849static inline void i_uid_write(struct inode *inode, uid_t uid)
850{
851 inode->i_uid = make_kuid(&init_user_ns, uid);
852}
853
854static inline void i_gid_write(struct inode *inode, gid_t gid)
855{
856 inode->i_gid = make_kgid(&init_user_ns, gid);
857}
858
Jan Engelhardt48ed2142006-12-06 20:35:37 -0800859static inline unsigned iminor(const struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860{
861 return MINOR(inode->i_rdev);
862}
863
Jan Engelhardt48ed2142006-12-06 20:35:37 -0800864static inline unsigned imajor(const struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865{
866 return MAJOR(inode->i_rdev);
867}
868
869extern struct block_device *I_BDEV(struct inode *inode);
870
871struct fown_struct {
872 rwlock_t lock; /* protects pid, uid, euid fields */
Eric W. Biederman609d7fa2006-10-02 02:17:15 -0700873 struct pid *pid; /* pid or -pgrp where SIGIO should be sent */
874 enum pid_type pid_type; /* Kind of process group SIGIO should be sent to */
Eric W. Biederman92361632012-02-08 07:07:50 -0800875 kuid_t uid, euid; /* uid/euid of process setting the owner */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876 int signum; /* posix.1b rt signal to be delivered on IO */
877};
878
879/*
880 * Track a single file's readahead state
881 */
882struct file_ra_state {
Fengguang Wu937085a2007-10-16 01:24:31 -0700883 pgoff_t start; /* where readahead started */
884 unsigned int size; /* # of readahead pages */
885 unsigned int async_size; /* do asynchronous readahead when
Fengguang Wuf9acc8c2007-07-19 01:48:08 -0700886 there are only # of pages ahead */
Fengguang Wu5ce11102007-07-19 01:47:59 -0700887
Fengguang Wu937085a2007-10-16 01:24:31 -0700888 unsigned int ra_pages; /* Maximum readahead window */
Wu Fengguang1ebf26a2009-06-16 15:31:19 -0700889 unsigned int mmap_miss; /* Cache miss stat for mmap accesses */
Fengguang Wuf4e6b492007-10-16 01:24:33 -0700890 loff_t prev_pos; /* Cache last read() position */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892
Fengguang Wu5ce11102007-07-19 01:47:59 -0700893/*
Fengguang Wu5ce11102007-07-19 01:47:59 -0700894 * Check if @index falls in the readahead windows.
895 */
896static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index)
897{
Fengguang Wuf9acc8c2007-07-19 01:48:08 -0700898 return (index >= ra->start &&
899 index < ra->start + ra->size);
Fengguang Wu5ce11102007-07-19 01:47:59 -0700900}
901
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902struct file {
Eric Dumazet2f512012005-10-30 15:02:16 -0800903 union {
Oleg Nesterov4f5e65a2013-07-08 14:24:16 -0700904 struct llist_node fu_llist;
Eric Dumazet2f512012005-10-30 15:02:16 -0800905 struct rcu_head fu_rcuhead;
906 } f_u;
Josef "Jeff" Sipek0f7fc9e2006-12-08 02:36:35 -0800907 struct path f_path;
Al Virodd379782013-03-01 19:48:30 -0500908 struct inode *f_inode; /* cached value */
Arjan van de Ven99ac48f2006-03-28 01:56:41 -0800909 const struct file_operations *f_op;
Andi Kleenef3d0fd2011-09-15 16:06:48 -0700910
911 /*
Linus Torvalds9c225f22014-03-03 09:36:58 -0800912 * Protects f_ep_links, f_flags.
Andi Kleenef3d0fd2011-09-15 16:06:48 -0700913 * Must not be taken from IRQ context.
914 */
915 spinlock_t f_lock;
Al Viro516e0cc2008-07-26 00:39:17 -0400916 atomic_long_t f_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917 unsigned int f_flags;
Al Viroaeb5d722008-09-02 15:28:45 -0400918 fmode_t f_mode;
Linus Torvalds9c225f22014-03-03 09:36:58 -0800919 struct mutex f_pos_lock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920 loff_t f_pos;
921 struct fown_struct f_owner;
David Howellsd76b0d92008-11-14 10:39:25 +1100922 const struct cred *f_cred;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923 struct file_ra_state f_ra;
924
Mathieu Desnoyers2b47c362007-10-16 23:27:21 -0700925 u64 f_version;
Alexey Dobriyan50462062006-09-29 02:00:01 -0700926#ifdef CONFIG_SECURITY
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927 void *f_security;
Alexey Dobriyan50462062006-09-29 02:00:01 -0700928#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929 /* needed for tty driver, and maybe others */
930 void *private_data;
931
932#ifdef CONFIG_EPOLL
933 /* Used by fs/eventpoll.c to link all the hooks to this file */
934 struct list_head f_ep_links;
Jason Baron28d82dc2012-01-12 17:17:43 -0800935 struct list_head f_tfile_llink;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936#endif /* #ifdef CONFIG_EPOLL */
937 struct address_space *f_mapping;
Al Virobd2a31d2014-03-04 14:54:22 -0500938} __attribute__((aligned(4))); /* lest something weird decides that 2 is OK */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939
Aneesh Kumar K.V990d6c22011-01-29 18:43:26 +0530940struct file_handle {
941 __u32 handle_bytes;
942 int handle_type;
943 /* file identifier */
944 unsigned char f_handle[0];
945};
946
Al Virocb0942b2012-08-27 14:48:26 -0400947static inline struct file *get_file(struct file *f)
948{
949 atomic_long_inc(&f->f_count);
950 return f;
951}
Konstantin Khlebnikov90f31d02015-04-16 12:47:56 -0700952#define get_file_rcu(x) atomic_long_inc_not_zero(&(x)->f_count)
Al Virod7065da2010-05-26 15:13:55 -0400953#define fput_atomic(x) atomic_long_add_unless(&(x)->f_count, -1, 1)
Al Viro516e0cc2008-07-26 00:39:17 -0400954#define file_count(x) atomic_long_read(&(x)->f_count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955
956#define MAX_NON_LFS ((1UL<<31) - 1)
957
958/* Page cache limit. The filesystems should put that into their s_maxbytes
959 limits, otherwise bad things can happen in VM. */
960#if BITS_PER_LONG==32
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300961#define MAX_LFS_FILESIZE (((loff_t)PAGE_SIZE << (BITS_PER_LONG-1))-1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962#elif BITS_PER_LONG==64
Al Viro614c3212012-10-10 01:06:20 -0400963#define MAX_LFS_FILESIZE ((loff_t)0x7fffffffffffffffLL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964#endif
965
966#define FL_POSIX 1
967#define FL_FLOCK 2
J. Bruce Fields617588d2011-07-01 15:18:34 -0400968#define FL_DELEG 4 /* NFSv4 delegation */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969#define FL_ACCESS 8 /* not trying to lock, just looking */
Trond Myklebustf475ae92006-06-29 16:38:32 -0400970#define FL_EXISTS 16 /* when unlocking, test for existence */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971#define FL_LEASE 32 /* lease held on this file */
Miklos Szeredi75e1fcc2006-06-23 02:05:12 -0700972#define FL_CLOSE 64 /* unlock on close */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973#define FL_SLEEP 128 /* A blocking lock */
J. Bruce Fields778fc542011-07-26 18:25:49 -0400974#define FL_DOWNGRADE_PENDING 256 /* Lease is being downgraded */
975#define FL_UNLOCK_PENDING 512 /* Lease is being broken */
Jeff Laytoncff2fce2014-04-22 08:24:32 -0400976#define FL_OFDLCK 1024 /* lock is "owned" by struct file */
Christoph Hellwig11afe9f2015-01-21 19:17:03 +0100977#define FL_LAYOUT 2048 /* outstanding pNFS layout */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978
979/*
Miklos Szeredibde74e42008-07-25 01:48:57 -0700980 * Special return value from posix_lock_file() and vfs_lock_file() for
981 * asynchronous locking.
982 */
983#define FILE_LOCK_DEFERRED 1
984
Jeff Layton7ca76312014-09-01 19:04:48 -0400985/* legacy typedef, should eventually be removed */
Christoph Hellwig17fa3882014-07-13 17:00:37 +0200986typedef void *fl_owner_t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987
Jeff Laytona7231a92015-01-16 15:05:56 -0500988struct file_lock;
989
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990struct file_lock_operations {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991 void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
992 void (*fl_release_private)(struct file_lock *);
993};
994
995struct lock_manager_operations {
J. Bruce Fields8fb47a42011-07-20 20:21:59 -0400996 int (*lm_compare_owner)(struct file_lock *, struct file_lock *);
Jeff Layton3999e492013-06-21 08:58:19 -0400997 unsigned long (*lm_owner_key)(struct file_lock *);
Jeff Laytoncae80b32015-04-03 09:04:04 -0400998 fl_owner_t (*lm_get_owner)(fl_owner_t);
999 void (*lm_put_owner)(fl_owner_t);
J. Bruce Fields8fb47a42011-07-20 20:21:59 -04001000 void (*lm_notify)(struct file_lock *); /* unblock callback */
Joe Perchesd0449b92014-08-22 10:18:42 -04001001 int (*lm_grant)(struct file_lock *, int);
Jeff Layton4d01b7f2014-09-01 15:06:54 -04001002 bool (*lm_break)(struct file_lock *);
Jeff Layton7448cc32015-01-16 15:05:57 -05001003 int (*lm_change)(struct file_lock *, int, struct list_head *);
Jeff Layton1c7dd2f2014-08-22 10:55:47 -04001004 void (*lm_setup)(struct file_lock *, void **);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005};
1006
J. Bruce Fieldsaf558e32007-09-06 12:34:25 -04001007struct lock_manager {
1008 struct list_head list;
J. Bruce Fieldsc87fb4a2015-08-06 12:47:02 -04001009 /*
1010 * NFSv4 and up also want opens blocked during the grace period;
1011 * NLM doesn't care:
1012 */
1013 bool block_opens;
J. Bruce Fieldsaf558e32007-09-06 12:34:25 -04001014};
1015
Stanislav Kinsbursky5ccb0062012-07-25 16:57:22 +04001016struct net;
1017void locks_start_grace(struct net *, struct lock_manager *);
J. Bruce Fieldsaf558e32007-09-06 12:34:25 -04001018void locks_end_grace(struct lock_manager *);
Stanislav Kinsbursky5ccb0062012-07-25 16:57:22 +04001019int locks_in_grace(struct net *);
J. Bruce Fieldsc87fb4a2015-08-06 12:47:02 -04001020int opens_in_grace(struct net *);
J. Bruce Fieldsaf558e32007-09-06 12:34:25 -04001021
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022/* that will die - we need it for nfs_lock_info */
1023#include <linux/nfs_fs_i.h>
1024
Jeff Layton1cb36012013-06-21 08:58:12 -04001025/*
1026 * struct file_lock represents a generic "file lock". It's used to represent
1027 * POSIX byte range locks, BSD (flock) locks, and leases. It's important to
1028 * note that the same struct is used to represent both a request for a lock and
1029 * the lock itself, but the same object is never used for both.
1030 *
1031 * FIXME: should we create a separate "struct lock_request" to help distinguish
1032 * these two uses?
1033 *
Jeff Layton8116bf42015-01-21 20:44:01 -05001034 * The varous i_flctx lists are ordered by:
Jeff Layton1cb36012013-06-21 08:58:12 -04001035 *
Jeff Layton8116bf42015-01-21 20:44:01 -05001036 * 1) lock owner
1037 * 2) lock range start
1038 * 3) lock range end
Jeff Layton1cb36012013-06-21 08:58:12 -04001039 *
1040 * Obviously, the last two criteria only matter for POSIX locks.
1041 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042struct file_lock {
1043 struct file_lock *fl_next; /* singly linked list for this inode */
Jeff Layton6dee60f2015-01-16 15:05:54 -05001044 struct list_head fl_list; /* link into file_lock_context */
Jeff Layton139ca042013-06-21 08:58:17 -04001045 struct hlist_node fl_link; /* node in global lists */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046 struct list_head fl_block; /* circular list of blocked processes */
1047 fl_owner_t fl_owner;
J. Bruce Fields710b7212011-07-26 16:28:29 -04001048 unsigned int fl_flags;
Richard Kennedyafc12462008-07-11 17:20:49 -07001049 unsigned char fl_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050 unsigned int fl_pid;
Jeff Layton7012b022013-06-21 08:58:22 -04001051 int fl_link_cpu; /* what cpu's list is this on? */
Vitaliy Gusevab1f1612008-01-17 00:07:08 +00001052 struct pid *fl_nspid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053 wait_queue_head_t fl_wait;
1054 struct file *fl_file;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001055 loff_t fl_start;
1056 loff_t fl_end;
1057
1058 struct fasync_struct * fl_fasync; /* for lease break notifications */
J. Bruce Fields778fc542011-07-26 18:25:49 -04001059 /* for lease breaks: */
1060 unsigned long fl_break_time;
1061 unsigned long fl_downgrade_time;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062
Alexey Dobriyan6aed6282009-09-21 17:01:11 -07001063 const struct file_lock_operations *fl_ops; /* Callbacks for filesystems */
Alexey Dobriyan7b021962009-09-21 17:01:12 -07001064 const struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065 union {
1066 struct nfs_lock_info nfs_fl;
Trond Myklebust8d0a8a92005-06-22 17:16:32 +00001067 struct nfs4_lock_info nfs4_fl;
David Howellse8d6c552007-07-15 23:40:12 -07001068 struct {
1069 struct list_head link; /* link in AFS vnode's pending_locks list */
1070 int state; /* state of grant or error if -ve */
1071 } afs;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072 } fl_u;
1073};
1074
Jeff Layton4a075e32015-01-16 15:05:54 -05001075struct file_lock_context {
Jeff Layton6109c852015-01-16 15:05:57 -05001076 spinlock_t flc_lock;
Jeff Layton4a075e32015-01-16 15:05:54 -05001077 struct list_head flc_flock;
Jeff Laytonbd61e0a2015-01-16 15:05:55 -05001078 struct list_head flc_posix;
Jeff Layton8634b512015-01-16 15:05:55 -05001079 struct list_head flc_lease;
Jeff Layton4a075e32015-01-16 15:05:54 -05001080};
1081
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082/* The following constant reflects the upper bound of the file/locking space */
1083#ifndef OFFSET_MAX
1084#define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
1085#define OFFSET_MAX INT_LIMIT(loff_t)
1086#define OFFT_OFFSET_MAX INT_LIMIT(off_t)
1087#endif
1088
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089#include <linux/fcntl.h>
1090
Thomas Petazzonibfcd17a2008-08-06 15:12:22 +02001091extern void send_sigio(struct fown_struct *fown, int fd, int band);
1092
Thomas Petazzonibfcd17a2008-08-06 15:12:22 +02001093#ifdef CONFIG_FILE_LOCKING
Jeff Laytonc1e62b82014-02-03 12:13:09 -05001094extern int fcntl_getlk(struct file *, unsigned int, struct flock __user *);
Peter Staubachc2936212005-07-27 11:45:09 -07001095extern int fcntl_setlk(unsigned int, struct file *, unsigned int,
1096 struct flock __user *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097
1098#if BITS_PER_LONG == 32
Jeff Laytonc1e62b82014-02-03 12:13:09 -05001099extern int fcntl_getlk64(struct file *, unsigned int, struct flock64 __user *);
Peter Staubachc2936212005-07-27 11:45:09 -07001100extern int fcntl_setlk64(unsigned int, struct file *, unsigned int,
1101 struct flock64 __user *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102#endif
1103
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg);
1105extern int fcntl_getlease(struct file *filp);
1106
1107/* fs/locks.c */
Jeff Laytonf27a0fe2016-01-07 15:08:51 -05001108void locks_free_lock_context(struct inode *inode);
J. Bruce Fields05fa3132010-10-30 17:31:15 -04001109void locks_free_lock(struct file_lock *fl);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110extern void locks_init_lock(struct file_lock *);
Arnd Bergmannc5b1f0d2010-10-27 15:46:08 +02001111extern struct file_lock * locks_alloc_lock(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001112extern void locks_copy_lock(struct file_lock *, struct file_lock *);
Kinglong Mee3fe0fff12014-08-22 10:18:42 -04001113extern void locks_copy_conflock(struct file_lock *, struct file_lock *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114extern void locks_remove_posix(struct file *, fl_owner_t);
Jeff Layton78ed8a12014-02-03 12:13:08 -05001115extern void locks_remove_file(struct file *);
Felix Blyakhera9e61e22009-03-31 15:12:56 -05001116extern void locks_release_private(struct file_lock *);
J. Bruce Fields6d34ac12007-05-11 16:09:32 -04001117extern void posix_test_lock(struct file *, struct file_lock *);
Marc Eshel150b3932007-01-18 16:15:35 -05001118extern int posix_lock_file(struct file *, struct file_lock *, struct file_lock *);
Jeff Laytonf891a292013-06-21 08:58:09 -04001119extern int posix_unblock_lock(struct file_lock *);
J. Bruce Fields3ee17ab2007-02-21 00:58:50 -05001120extern int vfs_test_lock(struct file *, struct file_lock *);
Marc Eshel150b3932007-01-18 16:15:35 -05001121extern int vfs_lock_file(struct file *, unsigned int, struct file_lock *, struct file_lock *);
Marc Eshel9b9d2ab2007-01-18 17:52:58 -05001122extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl);
Benjamin Coddingtone55c34a2015-10-22 13:38:13 -04001123extern int locks_lock_inode_wait(struct inode *inode, struct file_lock *fl);
J. Bruce Fieldsdf4e8d22012-03-05 13:18:59 -05001124extern int __break_lease(struct inode *inode, unsigned int flags, unsigned int type);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125extern void lease_get_mtime(struct inode *, struct timespec *time);
Jeff Laytone6f5c782014-08-22 10:40:25 -04001126extern int generic_setlease(struct file *, long, struct file_lock **, void **priv);
1127extern int vfs_setlease(struct file *, long, struct file_lock **, void **);
Jeff Layton7448cc32015-01-16 15:05:57 -05001128extern int lease_modify(struct file_lock *, int, struct list_head *);
Andrey Vagin6c8c9032015-04-16 12:49:38 -07001129struct files_struct;
1130extern void show_fd_locks(struct seq_file *f,
1131 struct file *filp, struct files_struct *files);
Thomas Petazzonibfcd17a2008-08-06 15:12:22 +02001132#else /* !CONFIG_FILE_LOCKING */
Jeff Laytonc1e62b82014-02-03 12:13:09 -05001133static inline int fcntl_getlk(struct file *file, unsigned int cmd,
1134 struct flock __user *user)
Steven Whitehousec2aca5e2009-01-20 10:29:45 +00001135{
1136 return -EINVAL;
1137}
1138
1139static inline int fcntl_setlk(unsigned int fd, struct file *file,
1140 unsigned int cmd, struct flock __user *user)
1141{
1142 return -EACCES;
1143}
1144
Thomas Petazzonibfcd17a2008-08-06 15:12:22 +02001145#if BITS_PER_LONG == 32
Jeff Laytonc1e62b82014-02-03 12:13:09 -05001146static inline int fcntl_getlk64(struct file *file, unsigned int cmd,
1147 struct flock64 __user *user)
Steven Whitehousec2aca5e2009-01-20 10:29:45 +00001148{
1149 return -EINVAL;
1150}
1151
1152static inline int fcntl_setlk64(unsigned int fd, struct file *file,
1153 unsigned int cmd, struct flock64 __user *user)
1154{
1155 return -EACCES;
1156}
Thomas Petazzonibfcd17a2008-08-06 15:12:22 +02001157#endif
Steven Whitehousec2aca5e2009-01-20 10:29:45 +00001158static inline int fcntl_setlease(unsigned int fd, struct file *filp, long arg)
1159{
Jeff Layton1b2b32d2014-09-24 08:38:44 -04001160 return -EINVAL;
Steven Whitehousec2aca5e2009-01-20 10:29:45 +00001161}
1162
1163static inline int fcntl_getlease(struct file *filp)
1164{
Jeff Layton1b2b32d2014-09-24 08:38:44 -04001165 return F_UNLCK;
Steven Whitehousec2aca5e2009-01-20 10:29:45 +00001166}
1167
Jeff Layton4a075e32015-01-16 15:05:54 -05001168static inline void
Jeff Laytonf27a0fe2016-01-07 15:08:51 -05001169locks_free_lock_context(struct inode *inode)
Jeff Layton4a075e32015-01-16 15:05:54 -05001170{
1171}
1172
Steven Whitehousec2aca5e2009-01-20 10:29:45 +00001173static inline void locks_init_lock(struct file_lock *fl)
1174{
1175 return;
1176}
1177
Kinglong Mee3fe0fff12014-08-22 10:18:42 -04001178static inline void locks_copy_conflock(struct file_lock *new, struct file_lock *fl)
Steven Whitehousec2aca5e2009-01-20 10:29:45 +00001179{
1180 return;
1181}
1182
1183static inline void locks_copy_lock(struct file_lock *new, struct file_lock *fl)
1184{
1185 return;
1186}
1187
1188static inline void locks_remove_posix(struct file *filp, fl_owner_t owner)
1189{
1190 return;
1191}
1192
Jeff Layton78ed8a12014-02-03 12:13:08 -05001193static inline void locks_remove_file(struct file *filp)
Steven Whitehousec2aca5e2009-01-20 10:29:45 +00001194{
1195 return;
1196}
1197
1198static inline void posix_test_lock(struct file *filp, struct file_lock *fl)
1199{
1200 return;
1201}
1202
1203static inline int posix_lock_file(struct file *filp, struct file_lock *fl,
1204 struct file_lock *conflock)
1205{
1206 return -ENOLCK;
1207}
1208
Jeff Laytonf891a292013-06-21 08:58:09 -04001209static inline int posix_unblock_lock(struct file_lock *waiter)
Steven Whitehousec2aca5e2009-01-20 10:29:45 +00001210{
1211 return -ENOENT;
1212}
1213
1214static inline int vfs_test_lock(struct file *filp, struct file_lock *fl)
1215{
1216 return 0;
1217}
1218
1219static inline int vfs_lock_file(struct file *filp, unsigned int cmd,
1220 struct file_lock *fl, struct file_lock *conf)
1221{
1222 return -ENOLCK;
1223}
1224
1225static inline int vfs_cancel_lock(struct file *filp, struct file_lock *fl)
1226{
1227 return 0;
1228}
1229
Benjamin Coddingtone55c34a2015-10-22 13:38:13 -04001230static inline int locks_lock_inode_wait(struct inode *inode, struct file_lock *fl)
1231{
1232 return -ENOLCK;
1233}
1234
J. Bruce Fieldsdf4e8d22012-03-05 13:18:59 -05001235static inline int __break_lease(struct inode *inode, unsigned int mode, unsigned int type)
Steven Whitehousec2aca5e2009-01-20 10:29:45 +00001236{
1237 return 0;
1238}
1239
1240static inline void lease_get_mtime(struct inode *inode, struct timespec *time)
1241{
1242 return;
1243}
1244
1245static inline int generic_setlease(struct file *filp, long arg,
Jeff Laytone6f5c782014-08-22 10:40:25 -04001246 struct file_lock **flp, void **priv)
Steven Whitehousec2aca5e2009-01-20 10:29:45 +00001247{
1248 return -EINVAL;
1249}
1250
1251static inline int vfs_setlease(struct file *filp, long arg,
Jeff Laytone6f5c782014-08-22 10:40:25 -04001252 struct file_lock **lease, void **priv)
Steven Whitehousec2aca5e2009-01-20 10:29:45 +00001253{
1254 return -EINVAL;
1255}
1256
Jeff Layton7448cc32015-01-16 15:05:57 -05001257static inline int lease_modify(struct file_lock *fl, int arg,
Jeff Laytonc45198e2014-09-01 07:12:07 -04001258 struct list_head *dispose)
Steven Whitehousec2aca5e2009-01-20 10:29:45 +00001259{
1260 return -EINVAL;
1261}
Andrey Vagin6c8c9032015-04-16 12:49:38 -07001262
1263struct files_struct;
1264static inline void show_fd_locks(struct seq_file *f,
1265 struct file *filp, struct files_struct *files) {}
Thomas Petazzonibfcd17a2008-08-06 15:12:22 +02001266#endif /* !CONFIG_FILE_LOCKING */
1267
Jeff Laytonee296d72015-07-11 06:43:03 -04001268static inline struct inode *file_inode(const struct file *f)
1269{
1270 return f->f_inode;
1271}
1272
Miklos Szeredid101a122016-03-26 16:14:37 -04001273static inline struct dentry *file_dentry(const struct file *file)
1274{
Miklos Szeredi2d902672016-06-30 08:53:27 +02001275 return d_real(file->f_path.dentry, file_inode(file), 0);
Miklos Szeredid101a122016-03-26 16:14:37 -04001276}
1277
Benjamin Coddingtone55c34a2015-10-22 13:38:13 -04001278static inline int locks_lock_file_wait(struct file *filp, struct file_lock *fl)
1279{
1280 return locks_lock_inode_wait(file_inode(filp), fl);
1281}
1282
Linus Torvalds1da177e2005-04-16 15:20:36 -07001283struct fasync_struct {
Eric Dumazet989a2972010-04-14 09:55:35 +00001284 spinlock_t fa_lock;
1285 int magic;
1286 int fa_fd;
1287 struct fasync_struct *fa_next; /* singly linked list */
1288 struct file *fa_file;
1289 struct rcu_head fa_rcu;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001290};
1291
1292#define FASYNC_MAGIC 0x4601
1293
1294/* SMP safe fasync helpers: */
1295extern int fasync_helper(int, struct file *, int, struct fasync_struct **);
Linus Torvaldsf7347ce2010-10-27 12:38:12 -04001296extern struct fasync_struct *fasync_insert_entry(int, struct file *, struct fasync_struct **, struct fasync_struct *);
1297extern int fasync_remove_entry(struct file *, struct fasync_struct **);
1298extern struct fasync_struct *fasync_alloc(void);
1299extern void fasync_free(struct fasync_struct *);
1300
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301/* can be called from interrupts */
1302extern void kill_fasync(struct fasync_struct **, int, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303
Jeff Laytone0b93ed2014-08-22 11:27:32 -04001304extern void __f_setown(struct file *filp, struct pid *, enum pid_type, int force);
1305extern void f_setown(struct file *filp, unsigned long arg, int force);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306extern void f_delown(struct file *filp);
Eric W. Biederman609d7fa2006-10-02 02:17:15 -07001307extern pid_t f_getown(struct file *filp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001308extern int send_sigurg(struct fown_struct *fown);
1309
Jan Kara5accdf82012-06-12 16:20:34 +02001310struct mm_struct;
1311
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312/*
1313 * Umount options
1314 */
1315
1316#define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
1317#define MNT_DETACH 0x00000002 /* Just detach from the tree */
1318#define MNT_EXPIRE 0x00000004 /* Mark for expiry */
Miklos Szeredidb1f05b2010-02-10 12:15:53 +01001319#define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */
1320#define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321
Tejun Heo46b15ca2015-06-16 18:48:31 -04001322/* sb->s_iflags */
1323#define SB_I_CGROUPWB 0x00000001 /* cgroup-aware writeback enabled */
Eric W. Biederman90f85722015-06-29 14:42:03 -05001324#define SB_I_NOEXEC 0x00000002 /* Ignore executables on this fs */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325
Jan Kara5accdf82012-06-12 16:20:34 +02001326/* Possible states of 'frozen' field */
1327enum {
1328 SB_UNFROZEN = 0, /* FS is unfrozen */
1329 SB_FREEZE_WRITE = 1, /* Writes, dir ops, ioctls frozen */
Jan Kara5accdf82012-06-12 16:20:34 +02001330 SB_FREEZE_PAGEFAULT = 2, /* Page faults stopped as well */
1331 SB_FREEZE_FS = 3, /* For internal FS use (e.g. to stop
1332 * internal threads if needed) */
1333 SB_FREEZE_COMPLETE = 4, /* ->freeze_fs finished successfully */
1334};
1335
1336#define SB_FREEZE_LEVELS (SB_FREEZE_COMPLETE - 1)
1337
1338struct sb_writers {
Oleg Nesterov8129ed22015-08-11 17:05:04 +02001339 int frozen; /* Is sb frozen? */
1340 wait_queue_head_t wait_unfrozen; /* for get_super_thawed() */
1341 struct percpu_rw_semaphore rw_sem[SB_FREEZE_LEVELS];
Jan Kara5accdf82012-06-12 16:20:34 +02001342};
1343
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344struct super_block {
1345 struct list_head s_list; /* Keep this first */
1346 dev_t s_dev; /* search index; _not_ kdev_t */
Richard Kennedy270ba5f2010-01-26 14:12:43 +00001347 unsigned char s_blocksize_bits;
1348 unsigned long s_blocksize;
Jeff Layton42cb56a2009-09-18 13:05:53 -07001349 loff_t s_maxbytes; /* Max file size */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350 struct file_system_type *s_type;
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -08001351 const struct super_operations *s_op;
Alexey Dobriyan61e225d2009-09-21 17:01:08 -07001352 const struct dquot_operations *dq_op;
Alexey Dobriyan0d54b212009-09-21 17:01:09 -07001353 const struct quotactl_ops *s_qcop;
Christoph Hellwig39655162007-10-21 16:42:17 -07001354 const struct export_operations *s_export_op;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001355 unsigned long s_flags;
Tejun Heo46b15ca2015-06-16 18:48:31 -04001356 unsigned long s_iflags; /* internal SB_I_* flags */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001357 unsigned long s_magic;
1358 struct dentry *s_root;
1359 struct rw_semaphore s_umount;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001360 int s_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001361 atomic_t s_active;
Alexey Dobriyan50462062006-09-29 02:00:01 -07001362#ifdef CONFIG_SECURITY
Linus Torvalds1da177e2005-04-16 15:20:36 -07001363 void *s_security;
Alexey Dobriyan50462062006-09-29 02:00:01 -07001364#endif
Stephen Hemmingerbb435452010-05-13 17:53:14 -07001365 const struct xattr_handler **s_xattr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001366
Jaegeuk Kim0b81d072015-05-15 16:26:10 -07001367 const struct fscrypt_operations *s_cop;
1368
Nick Pigginceb5bdc2011-01-07 17:50:05 +11001369 struct hlist_bl_head s_anon; /* anonymous dentries for (nfs) exporting */
Miklos Szeredi39f7c4d2011-11-21 12:11:30 +01001370 struct list_head s_mounts; /* list of mounts; _not_ for fs use */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371 struct block_device *s_bdev;
Jens Axboe32a88aa2009-09-16 15:02:33 +02001372 struct backing_dev_info *s_bdi;
David Howellsacaebfd2007-05-10 22:51:50 -07001373 struct mtd_info *s_mtd;
Al Viroa5166162011-12-12 22:53:00 -05001374 struct hlist_node s_instances;
Jan Kara2c5f6482014-09-30 10:43:09 +02001375 unsigned int s_quota_types; /* Bitmask of supported quota types */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376 struct quota_info s_dquot; /* Diskquota specific options */
1377
Jan Kara5accdf82012-06-12 16:20:34 +02001378 struct sb_writers s_writers;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379
1380 char s_id[32]; /* Informational name */
Linus Torvalds0bba0162011-04-12 15:21:04 -07001381 u8 s_uuid[16]; /* UUID */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001382
1383 void *s_fs_info; /* Filesystem private info */
Al Viro8de52772012-02-06 12:45:27 -05001384 unsigned int s_max_links;
Al Viro30c40d22008-02-22 19:50:45 -05001385 fmode_t s_mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386
Richard Kennedy270ba5f2010-01-26 14:12:43 +00001387 /* Granularity of c/m/atime in ns.
1388 Cannot be worse than a second */
1389 u32 s_time_gran;
1390
Linus Torvalds1da177e2005-04-16 15:20:36 -07001391 /*
1392 * The next field is for VFS *only*. No filesystems have any business
1393 * even looking at it. You had been warned.
1394 */
Arjan van de Vena11f3a02006-03-23 03:00:33 -08001395 struct mutex s_vfs_rename_mutex; /* Kludge */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001396
Miklos Szeredi79c0b2d2007-05-08 00:25:43 -07001397 /*
1398 * Filesystem subtype. If non-empty the filesystem type field
1399 * in /proc/mounts will be "type.subtype"
1400 */
1401 char *s_subtype;
Miklos Szeredib3b304a2008-02-08 04:21:35 -08001402
1403 /*
1404 * Saved mount options for lazy filesystems using
1405 * generic_show_options()
1406 */
Arnd Bergmann4d2deb42010-02-24 20:01:56 +01001407 char __rcu *s_options;
Al Viroc8aebb02010-12-18 10:22:30 -05001408 const struct dentry_operations *s_d_op; /* default d_op for dentries */
Dan Magenheimer9fdfdcf2011-05-26 10:01:19 -06001409
1410 /*
1411 * Saved pool identifier for cleancache (-1 means none)
1412 */
1413 int cleancache_poolid;
Dave Chinnerb0d40c92011-07-08 14:14:42 +10001414
1415 struct shrinker s_shrink; /* per-sb shrinker handle */
Miklos Szeredi4ed5e82f2011-11-21 12:11:31 +01001416
Miklos Szeredi7ada4db2011-11-21 12:11:32 +01001417 /* Number of inodes with nlink == 0 but still referenced */
1418 atomic_long_t s_remove_count;
1419
Miklos Szeredi4ed5e82f2011-11-21 12:11:31 +01001420 /* Being remounted read-only */
1421 int s_readonly_remount;
Christoph Hellwig7b7a8662013-09-04 15:04:39 +02001422
1423 /* AIO completions deferred from interrupt context */
1424 struct workqueue_struct *s_dio_done_wq;
Al Viro215752f2014-08-07 06:23:41 -04001425 struct hlist_head s_pins;
Dave Chinnerf6041562013-08-28 10:18:00 +10001426
1427 /*
1428 * Keep the lru lists last in the structure so they always sit on their
1429 * own individual cachelines.
1430 */
1431 struct list_lru s_dentry_lru ____cacheline_aligned_in_smp;
1432 struct list_lru s_inode_lru ____cacheline_aligned_in_smp;
Al Viroe2fec7c2013-10-04 17:06:56 -04001433 struct rcu_head rcu;
Oleg Nesterov853b39a2015-07-22 20:21:13 +02001434 struct work_struct destroy_work;
Miklos Szeredi69c433e2014-10-24 00:14:39 +02001435
Dave Chinnere97fedb2015-03-04 13:40:00 -05001436 struct mutex s_sync_lock; /* sync serialisation lock */
Miklos Szeredi69c433e2014-10-24 00:14:39 +02001437
1438 /*
1439 * Indicates how deep in a filesystem stack this SB is
1440 */
1441 int s_stack_depth;
Dave Chinner74278da2015-03-04 12:37:22 -05001442
1443 /* s_inode_list_lock protects s_inodes */
1444 spinlock_t s_inode_list_lock ____cacheline_aligned_in_smp;
1445 struct list_head s_inodes; /* all inodes */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001446};
1447
1448extern struct timespec current_fs_time(struct super_block *sb);
1449
1450/*
1451 * Snapshotting support.
1452 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001453
Jan Kara5accdf82012-06-12 16:20:34 +02001454void __sb_end_write(struct super_block *sb, int level);
1455int __sb_start_write(struct super_block *sb, int level, bool wait);
1456
Oleg Nesterovbee91822015-07-19 23:48:20 +02001457#define __sb_writers_acquired(sb, lev) \
Oleg Nesterov8129ed22015-08-11 17:05:04 +02001458 percpu_rwsem_acquire(&(sb)->s_writers.rw_sem[(lev)-1], 1, _THIS_IP_)
Oleg Nesterovbee91822015-07-19 23:48:20 +02001459#define __sb_writers_release(sb, lev) \
Oleg Nesterov8129ed22015-08-11 17:05:04 +02001460 percpu_rwsem_release(&(sb)->s_writers.rw_sem[(lev)-1], 1, _THIS_IP_)
Oleg Nesterovbee91822015-07-19 23:48:20 +02001461
Jan Kara5accdf82012-06-12 16:20:34 +02001462/**
1463 * sb_end_write - drop write access to a superblock
1464 * @sb: the super we wrote to
1465 *
1466 * Decrement number of writers to the filesystem. Wake up possible waiters
1467 * wanting to freeze the filesystem.
1468 */
1469static inline void sb_end_write(struct super_block *sb)
1470{
1471 __sb_end_write(sb, SB_FREEZE_WRITE);
1472}
1473
1474/**
1475 * sb_end_pagefault - drop write access to a superblock from a page fault
1476 * @sb: the super we wrote to
1477 *
1478 * Decrement number of processes handling write page fault to the filesystem.
1479 * Wake up possible waiters wanting to freeze the filesystem.
1480 */
1481static inline void sb_end_pagefault(struct super_block *sb)
1482{
1483 __sb_end_write(sb, SB_FREEZE_PAGEFAULT);
1484}
1485
1486/**
1487 * sb_end_intwrite - drop write access to a superblock for internal fs purposes
1488 * @sb: the super we wrote to
1489 *
1490 * Decrement fs-internal number of writers to the filesystem. Wake up possible
1491 * waiters wanting to freeze the filesystem.
1492 */
1493static inline void sb_end_intwrite(struct super_block *sb)
1494{
1495 __sb_end_write(sb, SB_FREEZE_FS);
1496}
1497
1498/**
1499 * sb_start_write - get write access to a superblock
1500 * @sb: the super we write to
1501 *
1502 * When a process wants to write data or metadata to a file system (i.e. dirty
1503 * a page or an inode), it should embed the operation in a sb_start_write() -
1504 * sb_end_write() pair to get exclusion against file system freezing. This
1505 * function increments number of writers preventing freezing. If the file
1506 * system is already frozen, the function waits until the file system is
1507 * thawed.
1508 *
1509 * Since freeze protection behaves as a lock, users have to preserve
1510 * ordering of freeze protection and other filesystem locks. Generally,
1511 * freeze protection should be the outermost lock. In particular, we have:
1512 *
1513 * sb_start_write
1514 * -> i_mutex (write path, truncate, directory ops, ...)
1515 * -> s_umount (freeze_super, thaw_super)
1516 */
1517static inline void sb_start_write(struct super_block *sb)
1518{
1519 __sb_start_write(sb, SB_FREEZE_WRITE, true);
1520}
1521
1522static inline int sb_start_write_trylock(struct super_block *sb)
1523{
1524 return __sb_start_write(sb, SB_FREEZE_WRITE, false);
1525}
1526
1527/**
1528 * sb_start_pagefault - get write access to a superblock from a page fault
1529 * @sb: the super we write to
1530 *
1531 * When a process starts handling write page fault, it should embed the
1532 * operation into sb_start_pagefault() - sb_end_pagefault() pair to get
1533 * exclusion against file system freezing. This is needed since the page fault
1534 * is going to dirty a page. This function increments number of running page
1535 * faults preventing freezing. If the file system is already frozen, the
1536 * function waits until the file system is thawed.
1537 *
1538 * Since page fault freeze protection behaves as a lock, users have to preserve
1539 * ordering of freeze protection and other filesystem locks. It is advised to
1540 * put sb_start_pagefault() close to mmap_sem in lock ordering. Page fault
1541 * handling code implies lock dependency:
1542 *
1543 * mmap_sem
1544 * -> sb_start_pagefault
1545 */
1546static inline void sb_start_pagefault(struct super_block *sb)
1547{
1548 __sb_start_write(sb, SB_FREEZE_PAGEFAULT, true);
1549}
1550
1551/*
1552 * sb_start_intwrite - get write access to a superblock for internal fs purposes
1553 * @sb: the super we write to
1554 *
1555 * This is the third level of protection against filesystem freezing. It is
1556 * free for use by a filesystem. The only requirement is that it must rank
1557 * below sb_start_pagefault.
1558 *
1559 * For example filesystem can call sb_start_intwrite() when starting a
1560 * transaction which somewhat eases handling of freezing for internal sources
1561 * of filesystem changes (internal fs threads, discarding preallocation on file
1562 * close, etc.).
1563 */
1564static inline void sb_start_intwrite(struct super_block *sb)
1565{
1566 __sb_start_write(sb, SB_FREEZE_FS, true);
1567}
1568
Linus Torvalds1da177e2005-04-16 15:20:36 -07001569
Serge E. Hallyn2e149672011-03-23 16:43:26 -07001570extern bool inode_owner_or_capable(const struct inode *inode);
Satyam Sharma3bd858ab2007-07-17 15:00:08 +05301571
Linus Torvalds1da177e2005-04-16 15:20:36 -07001572/*
1573 * VFS helper functions..
1574 */
Al Viro312b63f2012-06-10 18:09:36 -04001575extern int vfs_create(struct inode *, struct dentry *, umode_t, bool);
Al Viro18bb1db2011-07-26 01:41:39 -04001576extern int vfs_mkdir(struct inode *, struct dentry *, umode_t);
Al Viro1a67aaf2011-07-26 01:52:52 -04001577extern int vfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
Miklos Szeredidb2e7472008-06-24 16:50:16 +02001578extern int vfs_symlink(struct inode *, struct dentry *, const char *);
J. Bruce Fields146a8592011-09-20 17:14:31 -04001579extern int vfs_link(struct dentry *, struct inode *, struct dentry *, struct inode **);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001580extern int vfs_rmdir(struct inode *, struct dentry *);
J. Bruce Fieldsb21996e2011-09-20 09:14:34 -04001581extern int vfs_unlink(struct inode *, struct dentry *, struct inode **);
Miklos Szeredi520c8b12014-04-01 17:08:42 +02001582extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *, struct inode **, unsigned int);
Miklos Szeredi787fb6b2014-10-24 00:14:36 +02001583extern int vfs_whiteout(struct inode *, struct dentry *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001584
1585/*
Christoph Hellwig8c744fb2005-11-08 21:35:04 -08001586 * VFS file helper functions.
1587 */
Dmitry Monakhova1bd1202010-03-04 17:29:14 +03001588extern void inode_init_owner(struct inode *inode, const struct inode *dir,
Al Viro62bb1092011-07-24 23:20:18 -04001589 umode_t mode);
Christoph Hellwig8c744fb2005-11-08 21:35:04 -08001590/*
Mark Fashehc4b929b2008-10-08 19:44:18 -04001591 * VFS FS_IOC_FIEMAP helper definitions.
1592 */
1593struct fiemap_extent_info {
1594 unsigned int fi_flags; /* Flags as passed from user */
1595 unsigned int fi_extents_mapped; /* Number of mapped extents */
1596 unsigned int fi_extents_max; /* Size of fiemap_extent array */
Namhyung Kimecf56322011-01-16 23:28:17 +09001597 struct fiemap_extent __user *fi_extents_start; /* Start of
1598 fiemap_extent array */
Mark Fashehc4b929b2008-10-08 19:44:18 -04001599};
1600int fiemap_fill_next_extent(struct fiemap_extent_info *info, u64 logical,
1601 u64 phys, u64 len, u32 flags);
1602int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags);
1603
1604/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001605 * File types
1606 *
1607 * NOTE! These match bits 12..15 of stat.st_mode
1608 * (ie "(i_mode >> 12) & 15").
1609 */
1610#define DT_UNKNOWN 0
1611#define DT_FIFO 1
1612#define DT_CHR 2
1613#define DT_DIR 4
1614#define DT_BLK 6
1615#define DT_REG 8
1616#define DT_LNK 10
1617#define DT_SOCK 12
1618#define DT_WHT 14
1619
Linus Torvalds1da177e2005-04-16 15:20:36 -07001620/*
1621 * This is the "filldir" function type, used by readdir() to let
1622 * the kernel specify what kind of dirent layout it wants to have.
1623 * This allows the kernel to read directories into kernel space or
1624 * to have different dirent layouts depending on the binary type.
1625 */
Miklos Szerediac7576f2014-10-30 17:37:34 +01001626struct dir_context;
1627typedef int (*filldir_t)(struct dir_context *, const char *, int, loff_t, u64,
1628 unsigned);
1629
Al Viro5c0ba4e2013-05-15 13:52:59 -04001630struct dir_context {
Al Viroac6614b2013-05-22 22:22:04 -04001631 const filldir_t actor;
Al Virobb6f6192013-05-15 18:49:12 -04001632 loff_t pos;
Al Viro5c0ba4e2013-05-15 13:52:59 -04001633};
Al Virobb6f6192013-05-15 18:49:12 -04001634
Al Viro08f85852007-10-08 13:26:20 -04001635struct block_device_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001636
Linus Torvalds1da177e2005-04-16 15:20:36 -07001637/* These macros are for out of kernel modules to test that
1638 * the kernel supports the unlocked_ioctl and compat_ioctl
1639 * fields in struct file_operations. */
1640#define HAVE_COMPAT_IOCTL 1
1641#define HAVE_UNLOCKED_IOCTL 1
1642
Christoph Hellwigb4caecd2015-01-14 10:42:32 +01001643/*
1644 * These flags let !MMU mmap() govern direct device mapping vs immediate
1645 * copying more easily for MAP_PRIVATE, especially for ROM filesystems.
1646 *
1647 * NOMMU_MAP_COPY: Copy can be mapped (MAP_PRIVATE)
1648 * NOMMU_MAP_DIRECT: Can be mapped directly (MAP_SHARED)
1649 * NOMMU_MAP_READ: Can be mapped for reading
1650 * NOMMU_MAP_WRITE: Can be mapped for writing
1651 * NOMMU_MAP_EXEC: Can be mapped for execution
1652 */
1653#define NOMMU_MAP_COPY 0x00000001
1654#define NOMMU_MAP_DIRECT 0x00000008
1655#define NOMMU_MAP_READ VM_MAYREAD
1656#define NOMMU_MAP_WRITE VM_MAYWRITE
1657#define NOMMU_MAP_EXEC VM_MAYEXEC
1658
1659#define NOMMU_VMFLAGS \
1660 (NOMMU_MAP_READ | NOMMU_MAP_WRITE | NOMMU_MAP_EXEC)
1661
1662
Al Viro293bc982014-02-11 18:37:41 -05001663struct iov_iter;
1664
Linus Torvalds1da177e2005-04-16 15:20:36 -07001665struct file_operations {
1666 struct module *owner;
1667 loff_t (*llseek) (struct file *, loff_t, int);
1668 ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001669 ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
Al Viro293bc982014-02-11 18:37:41 -05001670 ssize_t (*read_iter) (struct kiocb *, struct iov_iter *);
1671 ssize_t (*write_iter) (struct kiocb *, struct iov_iter *);
Al Virobb6f6192013-05-15 18:49:12 -04001672 int (*iterate) (struct file *, struct dir_context *);
Al Viro61922692016-04-20 23:08:32 -04001673 int (*iterate_shared) (struct file *, struct dir_context *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001674 unsigned int (*poll) (struct file *, struct poll_table_struct *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001675 long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
1676 long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
1677 int (*mmap) (struct file *, struct vm_area_struct *);
1678 int (*open) (struct inode *, struct file *);
Miklos Szeredi75e1fcc2006-06-23 02:05:12 -07001679 int (*flush) (struct file *, fl_owner_t id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001680 int (*release) (struct inode *, struct file *);
Josef Bacik02c24a82011-07-16 20:44:56 -04001681 int (*fsync) (struct file *, loff_t, loff_t, int datasync);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001682 int (*aio_fsync) (struct kiocb *, int datasync);
1683 int (*fasync) (int, struct file *, int);
1684 int (*lock) (struct file *, int, struct file_lock *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001685 ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
1686 unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
1687 int (*check_flags)(int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001688 int (*flock) (struct file *, int, struct file_lock *);
Jens Axboecbb7e572006-04-11 14:57:50 +02001689 ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int);
1690 ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int);
Jeff Laytone6f5c782014-08-22 10:40:25 -04001691 int (*setlease)(struct file *, long, struct file_lock **, void **);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01001692 long (*fallocate)(struct file *file, int mode, loff_t offset,
1693 loff_t len);
Joe Perchesa3816ab2014-09-29 16:08:25 -07001694 void (*show_fdinfo)(struct seq_file *m, struct file *f);
Christoph Hellwigb4caecd2015-01-14 10:42:32 +01001695#ifndef CONFIG_MMU
1696 unsigned (*mmap_capabilities)(struct file *);
1697#endif
Christoph Hellwig04b38d62015-12-03 12:59:50 +01001698 ssize_t (*copy_file_range)(struct file *, loff_t, struct file *,
1699 loff_t, size_t, unsigned int);
1700 int (*clone_file_range)(struct file *, loff_t, struct file *, loff_t,
1701 u64);
Darrick J. Wong54dbc152015-12-19 00:55:59 -08001702 ssize_t (*dedupe_file_range)(struct file *, u64, u64, struct file *,
1703 u64);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001704};
1705
1706struct inode_operations {
Al Viro00cd8dd2012-06-10 17:13:09 -04001707 struct dentry * (*lookup) (struct inode *,struct dentry *, unsigned int);
Al Virofceef392015-12-29 15:58:39 -05001708 const char * (*get_link) (struct dentry *, struct inode *, struct delayed_call *);
Al Viro10556cb22011-06-20 19:28:19 -04001709 int (*permission) (struct inode *, int);
Christoph Hellwig4e34e712011-07-23 17:37:31 +02001710 struct posix_acl * (*get_acl)(struct inode *, int);
Nick Piggin44a7d7a2011-01-07 17:49:56 +11001711
1712 int (*readlink) (struct dentry *, char __user *,int);
Nick Piggin44a7d7a2011-01-07 17:49:56 +11001713
Al Viroebfc3b42012-06-10 18:05:36 -04001714 int (*create) (struct inode *,struct dentry *, umode_t, bool);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001715 int (*link) (struct dentry *,struct inode *,struct dentry *);
1716 int (*unlink) (struct inode *,struct dentry *);
1717 int (*symlink) (struct inode *,struct dentry *,const char *);
Al Viro18bb1db2011-07-26 01:41:39 -04001718 int (*mkdir) (struct inode *,struct dentry *,umode_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001719 int (*rmdir) (struct inode *,struct dentry *);
Al Viro1a67aaf2011-07-26 01:52:52 -04001720 int (*mknod) (struct inode *,struct dentry *,umode_t,dev_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001721 int (*rename) (struct inode *, struct dentry *,
1722 struct inode *, struct dentry *);
Miklos Szeredi520c8b12014-04-01 17:08:42 +02001723 int (*rename2) (struct inode *, struct dentry *,
1724 struct inode *, struct dentry *, unsigned int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001725 int (*setattr) (struct dentry *, struct iattr *);
1726 int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *);
Al Viro3767e252016-05-27 11:06:05 -04001727 int (*setxattr) (struct dentry *, struct inode *,
1728 const char *, const void *, size_t, int);
Al Viroce23e642016-04-11 00:48:00 -04001729 ssize_t (*getxattr) (struct dentry *, struct inode *,
1730 const char *, void *, size_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001731 ssize_t (*listxattr) (struct dentry *, char *, size_t);
1732 int (*removexattr) (struct dentry *, const char *);
Mark Fashehc4b929b2008-10-08 19:44:18 -04001733 int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start,
1734 u64 len);
Josef Bacikc3b2da32012-03-26 09:59:21 -04001735 int (*update_time)(struct inode *, struct timespec *, int);
Al Virod9585272012-06-22 12:39:14 +04001736 int (*atomic_open)(struct inode *, struct dentry *,
Al Viro30d90492012-06-22 12:40:19 +04001737 struct file *, unsigned open_flag,
Al Virod9585272012-06-22 12:39:14 +04001738 umode_t create_mode, int *opened);
Al Viro60545d02013-06-07 01:20:27 -04001739 int (*tmpfile) (struct inode *, struct dentry *, umode_t);
Christoph Hellwig893d46e2013-12-20 05:16:39 -08001740 int (*set_acl)(struct inode *, struct posix_acl *, int);
Nick Piggin44a7d7a2011-01-07 17:49:56 +11001741} ____cacheline_aligned;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001742
Badari Pulavartyeed4e512006-09-30 23:28:49 -07001743ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
Christopher Yeohfcf63402011-10-31 17:06:39 -07001744 unsigned long nr_segs, unsigned long fast_segs,
1745 struct iovec *fast_pointer,
Christopher Yeohac34ebb2012-05-31 16:26:42 -07001746 struct iovec **ret_pointer);
Badari Pulavartyeed4e512006-09-30 23:28:49 -07001747
Dmitry Kasatkin6fb50322014-11-05 17:01:17 +02001748extern ssize_t __vfs_read(struct file *, char __user *, size_t, loff_t *);
Al Viro493c84c2015-04-03 15:06:43 -04001749extern ssize_t __vfs_write(struct file *, const char __user *, size_t, loff_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001750extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
1751extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);
1752extern ssize_t vfs_readv(struct file *, const struct iovec __user *,
Christoph Hellwig793b80e2016-03-03 16:03:58 +01001753 unsigned long, loff_t *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001754extern ssize_t vfs_writev(struct file *, const struct iovec __user *,
Christoph Hellwig793b80e2016-03-03 16:03:58 +01001755 unsigned long, loff_t *, int);
Zach Brown29732932015-11-10 16:53:30 -05001756extern ssize_t vfs_copy_file_range(struct file *, loff_t , struct file *,
1757 loff_t, size_t, unsigned int);
Christoph Hellwig04b38d62015-12-03 12:59:50 +01001758extern int vfs_clone_file_range(struct file *file_in, loff_t pos_in,
1759 struct file *file_out, loff_t pos_out, u64 len);
Darrick J. Wong54dbc152015-12-19 00:55:59 -08001760extern int vfs_dedupe_file_range(struct file *file,
1761 struct file_dedupe_range *same);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001762
Linus Torvalds1da177e2005-04-16 15:20:36 -07001763struct super_operations {
1764 struct inode *(*alloc_inode)(struct super_block *sb);
1765 void (*destroy_inode)(struct inode *);
1766
Christoph Hellwigaa385722011-05-27 06:53:02 -04001767 void (*dirty_inode) (struct inode *, int flags);
Christoph Hellwiga9185b42010-03-05 09:21:37 +01001768 int (*write_inode) (struct inode *, struct writeback_control *wbc);
Al Viro45321ac2010-06-07 13:43:19 -04001769 int (*drop_inode) (struct inode *);
Al Virobe7ce412010-06-04 19:40:39 -04001770 void (*evict_inode) (struct inode *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001771 void (*put_super) (struct super_block *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001772 int (*sync_fs)(struct super_block *sb, int wait);
Benjamin Marzinski48b6bca2014-11-13 20:42:03 -06001773 int (*freeze_super) (struct super_block *);
Takashi Satoc4be0c12009-01-09 16:40:58 -08001774 int (*freeze_fs) (struct super_block *);
Benjamin Marzinski48b6bca2014-11-13 20:42:03 -06001775 int (*thaw_super) (struct super_block *);
Takashi Satoc4be0c12009-01-09 16:40:58 -08001776 int (*unfreeze_fs) (struct super_block *);
David Howells726c3342006-06-23 02:02:58 -07001777 int (*statfs) (struct dentry *, struct kstatfs *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001778 int (*remount_fs) (struct super_block *, int *, char *);
Al Viro42faad92008-04-24 07:21:56 -04001779 void (*umount_begin) (struct super_block *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001780
Al Viro34c80b12011-12-08 21:32:45 -05001781 int (*show_options)(struct seq_file *, struct dentry *);
Al Virod861c632011-12-08 21:32:45 -05001782 int (*show_devname)(struct seq_file *, struct dentry *);
Al Viroa6322de2011-12-08 21:37:57 -05001783 int (*show_path)(struct seq_file *, struct dentry *);
Al Viro64132372011-12-08 20:51:13 -05001784 int (*show_stats)(struct seq_file *, struct dentry *);
Alexey Dobriyan0e51a722006-09-29 01:59:56 -07001785#ifdef CONFIG_QUOTA
Linus Torvalds1da177e2005-04-16 15:20:36 -07001786 ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t);
1787 ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t);
Jan Kara2d0fa462014-09-25 16:36:14 +02001788 struct dquot **(*get_dquots)(struct inode *);
Alexey Dobriyan0e51a722006-09-29 01:59:56 -07001789#endif
Theodore Ts'o87d8fe12009-01-03 09:47:09 -05001790 int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t);
Vladimir Davydov4101b622015-02-12 14:58:51 -08001791 long (*nr_cached_objects)(struct super_block *,
1792 struct shrink_control *);
1793 long (*free_cached_objects)(struct super_block *,
1794 struct shrink_control *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001795};
1796
Joern Engel1c0eeaf2007-10-16 23:30:44 -07001797/*
David Howellsbbc10962012-10-15 16:40:35 +01001798 * Inode flags - they have no relation to superblock flags now
1799 */
1800#define S_SYNC 1 /* Writes are synced at once */
1801#define S_NOATIME 2 /* Do not update access times */
1802#define S_APPEND 4 /* Append-only file */
1803#define S_IMMUTABLE 8 /* Immutable file */
1804#define S_DEAD 16 /* removed, but still open directory */
1805#define S_NOQUOTA 32 /* Inode is not counted to quota */
1806#define S_DIRSYNC 64 /* Directory modifications are synchronous */
1807#define S_NOCMTIME 128 /* Do not update file c/mtime */
1808#define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */
1809#define S_PRIVATE 512 /* Inode is fs-internal */
1810#define S_IMA 1024 /* Inode has an associated IMA struct */
1811#define S_AUTOMOUNT 2048 /* Automount/referral quasi-directory */
1812#define S_NOSEC 4096 /* no suid or xattr security attributes */
Matthew Wilcox6cd176a2015-02-16 15:59:25 -08001813#ifdef CONFIG_FS_DAX
Matthew Wilcoxfbbbad42015-02-16 15:58:53 -08001814#define S_DAX 8192 /* Direct Access, avoiding the page cache */
1815#else
1816#define S_DAX 0 /* Make all the DAX code disappear */
1817#endif
David Howellsbbc10962012-10-15 16:40:35 +01001818
1819/*
1820 * Note that nosuid etc flags are inode-specific: setting some file-system
1821 * flags just means all the inodes inherit those flags by default. It might be
1822 * possible to override it selectively if you really wanted to with some
1823 * ioctl() that is not currently implemented.
1824 *
1825 * Exception: MS_RDONLY is always applied to the entire file system.
1826 *
1827 * Unfortunately, it is possible to change a filesystems flags with it mounted
1828 * with files in use. This means that all of the inodes will not have their
1829 * i_flags updated. Hence, i_flags no longer inherit the superblock mount
1830 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
1831 */
1832#define __IS_FLG(inode, flg) ((inode)->i_sb->s_flags & (flg))
1833
1834#define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY)
1835#define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \
1836 ((inode)->i_flags & S_SYNC))
1837#define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
1838 ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
1839#define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
1840#define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME)
1841#define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION)
1842
1843#define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
1844#define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
1845#define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
1846#define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL)
1847
1848#define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
1849#define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
1850#define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE)
1851#define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE)
1852#define IS_IMA(inode) ((inode)->i_flags & S_IMA)
1853#define IS_AUTOMOUNT(inode) ((inode)->i_flags & S_AUTOMOUNT)
1854#define IS_NOSEC(inode) ((inode)->i_flags & S_NOSEC)
Matthew Wilcoxfbbbad42015-02-16 15:58:53 -08001855#define IS_DAX(inode) ((inode)->i_flags & S_DAX)
David Howellsbbc10962012-10-15 16:40:35 +01001856
Miklos Szeredi787fb6b2014-10-24 00:14:36 +02001857#define IS_WHITEOUT(inode) (S_ISCHR(inode->i_mode) && \
1858 (inode)->i_rdev == WHITEOUT_DEV)
1859
David Howellsbbc10962012-10-15 16:40:35 +01001860/*
Dave Chinner250df6e2011-03-22 22:23:36 +11001861 * Inode state bits. Protected by inode->i_lock
Joern Engel1c0eeaf2007-10-16 23:30:44 -07001862 *
1863 * Three bits determine the dirty state of the inode, I_DIRTY_SYNC,
1864 * I_DIRTY_DATASYNC and I_DIRTY_PAGES.
1865 *
1866 * Four bits define the lifetime of an inode. Initially, inodes are I_NEW,
1867 * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at
1868 * various stages of removing an inode.
1869 *
Christoph Hellwigeaff8072009-12-17 14:25:01 +01001870 * Two bits are used for locking and completion notification, I_NEW and I_SYNC.
Joern Engel1c0eeaf2007-10-16 23:30:44 -07001871 *
Joern Engele7ca2d42008-02-06 01:36:59 -08001872 * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on
1873 * fdatasync(). i_atime is the usual cause.
Jan Kara000cb482008-02-14 19:31:32 -08001874 * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of
1875 * these changes separately from I_DIRTY_SYNC so that we
1876 * don't have to write inode on fdatasync() when only
1877 * mtime has changed in it.
Joern Engel1c0eeaf2007-10-16 23:30:44 -07001878 * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean.
Christoph Hellwigeaff8072009-12-17 14:25:01 +01001879 * I_NEW Serves as both a mutex and completion notification.
1880 * New inodes set I_NEW. If two processes both create
1881 * the same inode, one of them will release its inode and
1882 * wait for I_NEW to be released before returning.
1883 * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can
1884 * also cause waiting on I_NEW, without I_NEW actually
1885 * being set. find_inode() uses this to prevent returning
1886 * nearly-dead inodes.
Joern Engel1c0eeaf2007-10-16 23:30:44 -07001887 * I_WILL_FREE Must be set when calling write_inode_now() if i_count
1888 * is zero. I_FREEING must be set when I_WILL_FREE is
1889 * cleared.
1890 * I_FREEING Set when inode is about to be freed but still has dirty
1891 * pages or buffers attached or the inode itself is still
1892 * dirty.
Jan Karadbd57682012-05-03 14:48:02 +02001893 * I_CLEAR Added by clear_inode(). In this state the inode is
1894 * clean and can be destroyed. Inode keeps I_FREEING.
Joern Engel1c0eeaf2007-10-16 23:30:44 -07001895 *
1896 * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are
1897 * prohibited for many purposes. iget() must wait for
1898 * the inode to be completely released, then create it
1899 * anew. Other functions will just ignore such inodes,
Christoph Hellwigeaff8072009-12-17 14:25:01 +01001900 * if appropriate. I_NEW is used for waiting.
Joern Engel1c0eeaf2007-10-16 23:30:44 -07001901 *
Jan Kara169ebd92012-05-03 14:48:03 +02001902 * I_SYNC Writeback of inode is running. The bit is set during
1903 * data writeback, and cleared with a wakeup on the bit
1904 * address once it is done. The bit is also used to pin
1905 * the inode in memory for flusher thread.
Joern Engel1c0eeaf2007-10-16 23:30:44 -07001906 *
Christoph Hellwigbd5fe6c2011-06-24 14:29:43 -04001907 * I_REFERENCED Marks the inode as recently references on the LRU list.
1908 *
1909 * I_DIO_WAKEUP Never set. Only used as a key for wait_on_bit().
1910 *
Tejun Heo682aa8e2015-05-28 14:50:53 -04001911 * I_WB_SWITCH Cgroup bdi_writeback switching in progress. Used to
1912 * synchronize competing switching instances and to tell
1913 * wb stat updates to grab mapping->tree_lock. See
1914 * inode_switch_wb_work_fn() for details.
1915 *
Joern Engel1c0eeaf2007-10-16 23:30:44 -07001916 * Q: What is the difference between I_WILL_FREE and I_FREEING?
Joern Engel1c0eeaf2007-10-16 23:30:44 -07001917 */
Nick Piggin9e38d862010-10-23 06:55:17 -04001918#define I_DIRTY_SYNC (1 << 0)
1919#define I_DIRTY_DATASYNC (1 << 1)
1920#define I_DIRTY_PAGES (1 << 2)
Christoph Hellwigeaff8072009-12-17 14:25:01 +01001921#define __I_NEW 3
1922#define I_NEW (1 << __I_NEW)
Nick Piggin9e38d862010-10-23 06:55:17 -04001923#define I_WILL_FREE (1 << 4)
1924#define I_FREEING (1 << 5)
1925#define I_CLEAR (1 << 6)
Christoph Hellwigeaff8072009-12-17 14:25:01 +01001926#define __I_SYNC 7
Joern Engel1c0eeaf2007-10-16 23:30:44 -07001927#define I_SYNC (1 << __I_SYNC)
Nick Piggin9e38d862010-10-23 06:55:17 -04001928#define I_REFERENCED (1 << 8)
Christoph Hellwigbd5fe6c2011-06-24 14:29:43 -04001929#define __I_DIO_WAKEUP 9
Eric Sandeenac74d8d2015-04-16 15:04:56 -05001930#define I_DIO_WAKEUP (1 << __I_DIO_WAKEUP)
Al Virof4e0c302013-06-11 08:34:36 +04001931#define I_LINKABLE (1 << 10)
Theodore Ts'o0ae45f62015-02-02 00:37:00 -05001932#define I_DIRTY_TIME (1 << 11)
1933#define __I_DIRTY_TIME_EXPIRED 12
1934#define I_DIRTY_TIME_EXPIRED (1 << __I_DIRTY_TIME_EXPIRED)
Tejun Heo682aa8e2015-05-28 14:50:53 -04001935#define I_WB_SWITCH (1 << 13)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001936
1937#define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
Theodore Ts'o0ae45f62015-02-02 00:37:00 -05001938#define I_DIRTY_ALL (I_DIRTY | I_DIRTY_TIME)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001939
1940extern void __mark_inode_dirty(struct inode *, int);
1941static inline void mark_inode_dirty(struct inode *inode)
1942{
1943 __mark_inode_dirty(inode, I_DIRTY);
1944}
1945
1946static inline void mark_inode_dirty_sync(struct inode *inode)
1947{
1948 __mark_inode_dirty(inode, I_DIRTY_SYNC);
1949}
1950
Miklos Szeredi7ada4db2011-11-21 12:11:32 +01001951extern void inc_nlink(struct inode *inode);
1952extern void drop_nlink(struct inode *inode);
1953extern void clear_nlink(struct inode *inode);
1954extern void set_nlink(struct inode *inode, unsigned int nlink);
Dave Hansend8c76e62006-09-30 23:29:04 -07001955
1956static inline void inode_inc_link_count(struct inode *inode)
1957{
1958 inc_nlink(inode);
Alexey Dobriyan66d21732006-03-23 03:00:51 -08001959 mark_inode_dirty(inode);
1960}
1961
Dave Hansen9a53c3a2006-09-30 23:29:03 -07001962static inline void inode_dec_link_count(struct inode *inode)
1963{
1964 drop_nlink(inode);
Alexey Dobriyan66d21732006-03-23 03:00:51 -08001965 mark_inode_dirty(inode);
1966}
1967
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -05001968/**
1969 * inode_inc_iversion - increments i_version
1970 * @inode: inode that need to be updated
1971 *
1972 * Every time the inode is modified, the i_version field will be incremented.
1973 * The filesystem has to be mounted with i_version flag
1974 */
1975
1976static inline void inode_inc_iversion(struct inode *inode)
1977{
1978 spin_lock(&inode->i_lock);
1979 inode->i_version++;
1980 spin_unlock(&inode->i_lock);
1981}
1982
Josef Bacikc3b2da32012-03-26 09:59:21 -04001983enum file_time_flags {
1984 S_ATIME = 1,
1985 S_MTIME = 2,
1986 S_CTIME = 4,
1987 S_VERSION = 8,
1988};
1989
NeilBrown8fa9dd22015-03-23 13:37:40 +11001990extern bool atime_needs_update(const struct path *, struct inode *);
Al Virobadcf2b2013-07-16 18:15:46 +04001991extern void touch_atime(const struct path *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001992static inline void file_accessed(struct file *file)
1993{
1994 if (!(file->f_flags & O_NOATIME))
Al Viro68ac1232012-03-15 08:21:57 -04001995 touch_atime(&file->f_path);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001996}
1997
1998int sync_inode(struct inode *inode, struct writeback_control *wbc);
Christoph Hellwigc37650162010-10-06 10:48:20 +02001999int sync_inode_metadata(struct inode *inode, int wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002000
Linus Torvalds1da177e2005-04-16 15:20:36 -07002001struct file_system_type {
2002 const char *name;
2003 int fs_flags;
David Howellsbbc10962012-10-15 16:40:35 +01002004#define FS_REQUIRES_DEV 1
2005#define FS_BINARY_MOUNTDATA 2
2006#define FS_HAS_SUBTYPE 4
Eric W. Biederman0c55cfc2012-07-26 21:42:03 -07002007#define FS_USERNS_MOUNT 8 /* Can be mounted by userns root */
2008#define FS_USERNS_DEV_MOUNT 16 /* A userns mount does not imply MNT_NODEV */
Eric W. Biederman1b852bc2015-05-08 23:22:29 -05002009#define FS_USERNS_VISIBLE 32 /* FS must already be visible */
David Howellsbbc10962012-10-15 16:40:35 +01002010#define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move() during rename() internally. */
Al Viroc96e41e2010-07-25 00:17:56 +04002011 struct dentry *(*mount) (struct file_system_type *, int,
2012 const char *, void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002013 void (*kill_sb) (struct super_block *);
2014 struct module *owner;
2015 struct file_system_type * next;
Al Viroa5166162011-12-12 22:53:00 -05002016 struct hlist_head fs_supers;
Peter Zijlstrad475fd42007-10-15 14:51:31 +02002017
Ingo Molnarcf516242006-07-03 00:25:27 -07002018 struct lock_class_key s_lock_key;
Arjan van de Ven897c6ff2006-07-03 00:25:28 -07002019 struct lock_class_key s_umount_key;
Roland Dreier51ee0492010-04-27 14:23:57 -07002020 struct lock_class_key s_vfs_rename_key;
Jan Kara5accdf82012-06-12 16:20:34 +02002021 struct lock_class_key s_writers_key[SB_FREEZE_LEVELS];
Peter Zijlstrad475fd42007-10-15 14:51:31 +02002022
2023 struct lock_class_key i_lock_key;
2024 struct lock_class_key i_mutex_key;
Peter Zijlstra14358e62007-10-14 01:38:33 +02002025 struct lock_class_key i_mutex_dir_key;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002026};
2027
Eric W. Biederman7f78e032013-03-02 19:39:14 -08002028#define MODULE_ALIAS_FS(NAME) MODULE_ALIAS("fs-" NAME)
2029
Al Viroceefda62010-07-26 13:16:50 +04002030extern struct dentry *mount_ns(struct file_system_type *fs_type, int flags,
2031 void *data, int (*fill_super)(struct super_block *, void *, int));
Al Viro152a0832010-07-25 00:46:55 +04002032extern struct dentry *mount_bdev(struct file_system_type *fs_type,
2033 int flags, const char *dev_name, void *data,
2034 int (*fill_super)(struct super_block *, void *, int));
Al Virofc14f2f2010-07-25 01:48:30 +04002035extern struct dentry *mount_single(struct file_system_type *fs_type,
2036 int flags, void *data,
2037 int (*fill_super)(struct super_block *, void *, int));
Al Viro3c26ff62010-07-25 11:46:36 +04002038extern struct dentry *mount_nodev(struct file_system_type *fs_type,
2039 int flags, void *data,
2040 int (*fill_super)(struct super_block *, void *, int));
Al Viroea441d12011-11-16 21:43:59 -05002041extern struct dentry *mount_subtree(struct vfsmount *mnt, const char *path);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002042void generic_shutdown_super(struct super_block *sb);
2043void kill_block_super(struct super_block *sb);
2044void kill_anon_super(struct super_block *sb);
2045void kill_litter_super(struct super_block *sb);
2046void deactivate_super(struct super_block *sb);
Al Viro74dbbdd2009-05-06 01:07:50 -04002047void deactivate_locked_super(struct super_block *sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002048int set_anon_super(struct super_block *s, void *data);
Al Viro0ee5dc62011-07-07 15:44:25 -04002049int get_anon_bdev(dev_t *);
2050void free_anon_bdev(dev_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002051struct super_block *sget(struct file_system_type *type,
2052 int (*test)(struct super_block *,void *),
2053 int (*set)(struct super_block *,void *),
David Howells9249e172012-06-25 12:55:37 +01002054 int flags, void *data);
Al Viro51139ad2010-07-25 23:47:46 +04002055extern struct dentry *mount_pseudo(struct file_system_type *, char *,
Al Viroc74a1cb2011-01-12 16:59:34 -05002056 const struct super_operations *ops,
2057 const struct dentry_operations *dops,
2058 unsigned long);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002059
2060/* Alas, no aliases. Too much hassle with bringing module.h everywhere */
2061#define fops_get(fops) \
2062 (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
2063#define fops_put(fops) \
2064 do { if (fops) module_put((fops)->owner); } while(0)
Al Viroe84f9e52013-09-22 14:17:15 -04002065/*
2066 * This one is to be used *ONLY* from ->open() instances.
2067 * fops must be non-NULL, pinned down *and* module dependencies
2068 * should be sufficient to pin the caller down as well.
2069 */
2070#define replace_fops(f, fops) \
2071 do { \
2072 struct file *__file = (f); \
2073 fops_put(__file->f_op); \
2074 BUG_ON(!(__file->f_op = (fops))); \
2075 } while(0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002076
2077extern int register_filesystem(struct file_system_type *);
2078extern int unregister_filesystem(struct file_system_type *);
Pavel Emelyanov8bf97252007-10-18 23:40:02 -07002079extern struct vfsmount *kern_mount_data(struct file_system_type *, void *data);
2080#define kern_mount(type) kern_mount_data(type, NULL)
Tim Chen423e0ab2011-07-19 09:32:38 -07002081extern void kern_unmount(struct vfsmount *mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002082extern int may_umount_tree(struct vfsmount *);
2083extern int may_umount(struct vfsmount *);
Seunghun Lee5e6123f2014-09-14 22:15:10 +09002084extern long do_mount(const char *, const char __user *,
2085 const char *, unsigned long, void *);
Al Viro589ff872009-04-18 03:28:19 -04002086extern struct vfsmount *collect_mounts(struct path *);
Al Viro8aec0802007-06-07 12:20:32 -04002087extern void drop_collected_mounts(struct vfsmount *);
Al Viro1f707132010-01-30 22:51:25 -05002088extern int iterate_mounts(int (*)(struct vfsmount *, void *), void *,
2089 struct vfsmount *);
Christoph Hellwigebabe9a2010-07-07 18:53:11 +02002090extern int vfs_statfs(struct path *, struct kstatfs *);
Al Viroc8b91ac2011-03-12 10:41:39 -05002091extern int user_statfs(const char __user *, struct kstatfs *);
2092extern int fd_statfs(int, struct kstatfs *);
Al Virocf31e702012-01-02 22:28:36 -05002093extern int vfs_ustat(dev_t, struct kstatfs *);
Josef Bacik18e9e512010-03-23 10:34:56 -04002094extern int freeze_super(struct super_block *super);
2095extern int thaw_super(struct super_block *super);
Al Viro02125a82011-12-05 08:43:34 -05002096extern bool our_mnt(struct vfsmount *mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002097
Al Viroce3b0f82009-03-29 19:08:22 -04002098extern int current_umask(void);
2099
J. Bruce Fields5a146962012-08-28 07:50:40 -07002100extern void ihold(struct inode * inode);
2101extern void iput(struct inode *);
Theodore Ts'o0ae45f62015-02-02 00:37:00 -05002102extern int generic_update_time(struct inode *, struct timespec *, int);
J. Bruce Fields5a146962012-08-28 07:50:40 -07002103
Miklos Szeredif87fd4c2006-01-16 22:14:23 -08002104/* /sys/fs */
Greg Kroah-Hartman00d26662007-10-29 14:17:23 -06002105extern struct kobject *fs_kobj;
Miklos Szeredif87fd4c2006-01-16 22:14:23 -08002106
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +03002107#define MAX_RW_COUNT (INT_MAX & PAGE_MASK)
Thomas Petazzonibfcd17a2008-08-06 15:12:22 +02002108
Jeff Layton9e8925b2015-11-16 09:49:34 -05002109#ifdef CONFIG_MANDATORY_FILE_LOCKING
Jeff Laytond7a06982014-03-10 09:54:15 -04002110extern int locks_mandatory_locked(struct file *);
Christoph Hellwigacc15572015-12-03 12:59:49 +01002111extern int locks_mandatory_area(struct inode *, struct file *, loff_t, loff_t, unsigned char);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002112
2113/*
2114 * Candidates for mandatory locking have the setgid bit set
2115 * but no group execute bit - an otherwise meaningless combination.
2116 */
Pavel Emelyanova16877c2007-10-01 14:41:11 -07002117
2118static inline int __mandatory_lock(struct inode *ino)
2119{
2120 return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID;
2121}
2122
2123/*
2124 * ... and these candidates should be on MS_MANDLOCK mounted fs,
2125 * otherwise these will be advisory locks
2126 */
2127
2128static inline int mandatory_lock(struct inode *ino)
2129{
2130 return IS_MANDLOCK(ino) && __mandatory_lock(ino);
2131}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002132
Jeff Laytond7a06982014-03-10 09:54:15 -04002133static inline int locks_verify_locked(struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002134{
Jeff Laytond7a06982014-03-10 09:54:15 -04002135 if (mandatory_lock(file_inode(file)))
2136 return locks_mandatory_locked(file);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002137 return 0;
2138}
2139
Linus Torvalds1da177e2005-04-16 15:20:36 -07002140static inline int locks_verify_truncate(struct inode *inode,
Christoph Hellwigacc15572015-12-03 12:59:49 +01002141 struct file *f,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002142 loff_t size)
2143{
Christoph Hellwigacc15572015-12-03 12:59:49 +01002144 if (!inode->i_flctx || !mandatory_lock(inode))
2145 return 0;
2146
2147 if (size < inode->i_size) {
2148 return locks_mandatory_area(inode, f, size, inode->i_size - 1,
2149 F_WRLCK);
2150 } else {
2151 return locks_mandatory_area(inode, f, inode->i_size, size - 1,
2152 F_WRLCK);
2153 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002154}
2155
Jeff Layton9e8925b2015-11-16 09:49:34 -05002156#else /* !CONFIG_MANDATORY_FILE_LOCKING */
2157
2158static inline int locks_mandatory_locked(struct file *file)
2159{
2160 return 0;
2161}
2162
Linus Torvaldsfce205e2016-01-12 16:30:34 -08002163static inline int locks_mandatory_area(struct inode *inode, struct file *filp,
2164 loff_t start, loff_t end, unsigned char type)
Jeff Layton9e8925b2015-11-16 09:49:34 -05002165{
2166 return 0;
2167}
2168
2169static inline int __mandatory_lock(struct inode *inode)
2170{
2171 return 0;
2172}
2173
2174static inline int mandatory_lock(struct inode *inode)
2175{
2176 return 0;
2177}
2178
2179static inline int locks_verify_locked(struct file *file)
2180{
2181 return 0;
2182}
2183
2184static inline int locks_verify_truncate(struct inode *inode, struct file *filp,
2185 size_t size)
2186{
2187 return 0;
2188}
2189
2190#endif /* CONFIG_MANDATORY_FILE_LOCKING */
2191
2192
2193#ifdef CONFIG_FILE_LOCKING
Linus Torvalds1da177e2005-04-16 15:20:36 -07002194static inline int break_lease(struct inode *inode, unsigned int mode)
2195{
Jeff Layton24cbe782014-02-03 12:13:06 -05002196 /*
2197 * Since this check is lockless, we must ensure that any refcounts
Jeff Layton8116bf42015-01-21 20:44:01 -05002198 * taken are done before checking i_flctx->flc_lease. Otherwise, we
2199 * could end up racing with tasks trying to set a new lease on this
2200 * file.
Jeff Layton24cbe782014-02-03 12:13:06 -05002201 */
2202 smp_mb();
Jeff Layton8634b512015-01-16 15:05:55 -05002203 if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease))
J. Bruce Fieldsdf4e8d22012-03-05 13:18:59 -05002204 return __break_lease(inode, mode, FL_LEASE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002205 return 0;
2206}
J. Bruce Fieldsdf4e8d22012-03-05 13:18:59 -05002207
2208static inline int break_deleg(struct inode *inode, unsigned int mode)
2209{
Jeff Layton962bd402014-06-10 12:24:40 -04002210 /*
2211 * Since this check is lockless, we must ensure that any refcounts
Jeff Layton8116bf42015-01-21 20:44:01 -05002212 * taken are done before checking i_flctx->flc_lease. Otherwise, we
2213 * could end up racing with tasks trying to set a new lease on this
2214 * file.
Jeff Layton962bd402014-06-10 12:24:40 -04002215 */
2216 smp_mb();
Jeff Layton8634b512015-01-16 15:05:55 -05002217 if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease))
J. Bruce Fieldsdf4e8d22012-03-05 13:18:59 -05002218 return __break_lease(inode, mode, FL_DELEG);
2219 return 0;
2220}
2221
J. Bruce Fields5a146962012-08-28 07:50:40 -07002222static inline int try_break_deleg(struct inode *inode, struct inode **delegated_inode)
2223{
2224 int ret;
2225
2226 ret = break_deleg(inode, O_WRONLY|O_NONBLOCK);
2227 if (ret == -EWOULDBLOCK && delegated_inode) {
2228 *delegated_inode = inode;
2229 ihold(inode);
2230 }
2231 return ret;
2232}
2233
2234static inline int break_deleg_wait(struct inode **delegated_inode)
2235{
2236 int ret;
2237
2238 ret = break_deleg(*delegated_inode, O_WRONLY);
2239 iput(*delegated_inode);
2240 *delegated_inode = NULL;
2241 return ret;
2242}
2243
Christoph Hellwig11afe9f2015-01-21 19:17:03 +01002244static inline int break_layout(struct inode *inode, bool wait)
2245{
2246 smp_mb();
2247 if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease))
2248 return __break_lease(inode,
2249 wait ? O_WRONLY : O_WRONLY | O_NONBLOCK,
2250 FL_LAYOUT);
2251 return 0;
2252}
2253
Thomas Petazzonibfcd17a2008-08-06 15:12:22 +02002254#else /* !CONFIG_FILE_LOCKING */
Steven Whitehouseaf5df562009-01-20 10:29:46 +00002255static inline int break_lease(struct inode *inode, unsigned int mode)
2256{
2257 return 0;
2258}
2259
J. Bruce Fieldsdf4e8d22012-03-05 13:18:59 -05002260static inline int break_deleg(struct inode *inode, unsigned int mode)
2261{
2262 return 0;
2263}
J. Bruce Fields5a146962012-08-28 07:50:40 -07002264
2265static inline int try_break_deleg(struct inode *inode, struct inode **delegated_inode)
2266{
2267 return 0;
2268}
2269
2270static inline int break_deleg_wait(struct inode **delegated_inode)
2271{
2272 BUG();
2273 return 0;
2274}
2275
Christoph Hellwig11afe9f2015-01-21 19:17:03 +01002276static inline int break_layout(struct inode *inode, bool wait)
2277{
2278 return 0;
2279}
2280
Thomas Petazzonibfcd17a2008-08-06 15:12:22 +02002281#endif /* CONFIG_FILE_LOCKING */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002282
2283/* fs/open.c */
Jeff Laytonadb5c242012-10-10 16:43:13 -04002284struct audit_names;
Jeff Layton91a27b22012-10-10 15:25:28 -04002285struct filename {
Jeff Laytonadb5c242012-10-10 16:43:13 -04002286 const char *name; /* pointer to actual string */
2287 const __user char *uptr; /* original userland pointer */
2288 struct audit_names *aname;
Paul Moore55422d02015-01-22 00:00:23 -05002289 int refcnt;
Al Virofd2f7cb2015-02-22 20:07:13 -05002290 const char iname[];
Jeff Layton91a27b22012-10-10 15:25:28 -04002291};
Linus Torvalds1da177e2005-04-16 15:20:36 -07002292
Al Viro7df818b2016-03-25 14:24:09 -04002293extern long vfs_truncate(const struct path *, loff_t);
NeilBrown4a301312006-01-08 01:02:39 -08002294extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs,
2295 struct file *filp);
Anna Schumaker72c72bd2014-11-07 14:44:25 -05002296extern int vfs_fallocate(struct file *file, int mode, loff_t offset,
Ankit Jain3e63cbb2009-06-19 14:28:07 -04002297 loff_t len);
Jason Uhlenkott8e8a1402007-10-20 03:16:18 +02002298extern long do_sys_open(int dfd, const char __user *filename, int flags,
Al Viroa218d0f2011-11-21 14:59:34 -05002299 umode_t mode);
Jeff Layton669abf42012-10-10 16:43:10 -04002300extern struct file *file_open_name(struct filename *, int, umode_t);
Al Viroa218d0f2011-11-21 14:59:34 -05002301extern struct file *filp_open(const char *, int, umode_t);
Al Viro73d049a2011-03-11 12:08:24 -05002302extern struct file *file_open_root(struct dentry *, struct vfsmount *,
Jann Horn378c6522016-03-22 14:25:36 -07002303 const char *, int, umode_t);
Al Viro765927b2012-06-26 21:58:53 +04002304extern struct file * dentry_open(const struct path *, int, const struct cred *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002305extern int filp_close(struct file *, fl_owner_t id);
Jeff Layton91a27b22012-10-10 15:25:28 -04002306
David Drysdale51f39a12014-12-12 16:57:29 -08002307extern struct filename *getname_flags(const char __user *, int, int *);
Jeff Layton91a27b22012-10-10 15:25:28 -04002308extern struct filename *getname(const char __user *);
Linus Torvaldsc4ad8f92014-02-05 12:54:53 -08002309extern struct filename *getname_kernel(const char *);
Paul Moore55422d02015-01-22 00:00:23 -05002310extern void putname(struct filename *name);
Jeff Layton91a27b22012-10-10 15:25:28 -04002311
Al Viro47237682012-06-10 05:01:45 -04002312enum {
2313 FILE_CREATED = 1,
2314 FILE_OPENED = 2
2315};
Al Viro30d90492012-06-22 12:40:19 +04002316extern int finish_open(struct file *file, struct dentry *dentry,
2317 int (*open)(struct inode *, struct file *),
2318 int *opened);
Al Viroe45198a2012-06-10 06:48:09 -04002319extern int finish_no_open(struct file *file, struct dentry *dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002320
Ankit Jain3e63cbb2009-06-19 14:28:07 -04002321/* fs/ioctl.c */
2322
2323extern int ioctl_preallocate(struct file *filp, void __user *argp);
2324
Linus Torvalds1da177e2005-04-16 15:20:36 -07002325/* fs/dcache.c */
2326extern void __init vfs_caches_init_early(void);
Mel Gorman4248b0d2015-08-06 15:46:20 -07002327extern void __init vfs_caches_init(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002328
Christoph Lameterb86c0892006-12-06 20:32:57 -08002329extern struct kmem_cache *names_cachep;
2330
Jeff Laytona608ca22012-10-10 15:25:26 -04002331#define __getname() kmem_cache_alloc(names_cachep, GFP_KERNEL)
Vegard Nossum3446a8a2009-05-16 11:22:14 +02002332#define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002333
David Howells93614012006-09-30 20:45:40 +02002334#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -07002335extern int register_blkdev(unsigned int, const char *);
Akinobu Mitaf4480242007-07-17 04:03:47 -07002336extern void unregister_blkdev(unsigned int, const char *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002337extern struct block_device *bdget(dev_t);
Alan Jenkinsdddac6a2009-07-29 21:07:55 +02002338extern struct block_device *bdgrab(struct block_device *bdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002339extern void bd_set_size(struct block_device *, loff_t size);
2340extern void bd_forget(struct inode *inode);
2341extern void bdput(struct block_device *);
Nick Piggin585d3bc2009-02-25 10:44:19 +01002342extern void invalidate_bdev(struct block_device *);
Jan Kara5c0d6b62012-07-03 16:45:31 +02002343extern void iterate_bdevs(void (*)(struct block_device *, void *), void *);
Nick Piggin585d3bc2009-02-25 10:44:19 +01002344extern int sync_blockdev(struct block_device *bdev);
Al Viroff01bb42011-09-16 02:31:11 -04002345extern void kill_bdev(struct block_device *);
Nick Piggin585d3bc2009-02-25 10:44:19 +01002346extern struct super_block *freeze_bdev(struct block_device *);
Eric Sandeenc2d75432009-03-31 15:23:46 -07002347extern void emergency_thaw_all(void);
Nick Piggin585d3bc2009-02-25 10:44:19 +01002348extern int thaw_bdev(struct block_device *bdev, struct super_block *sb);
2349extern int fsync_bdev(struct block_device *);
Tejun Heoa212b102015-05-22 17:13:33 -04002350
2351extern struct super_block *blockdev_superblock;
2352
2353static inline bool sb_is_blkdev_sb(struct super_block *sb)
2354{
2355 return sb == blockdev_superblock;
2356}
David Howells93614012006-09-30 20:45:40 +02002357#else
2358static inline void bd_forget(struct inode *inode) {}
Al Viro47e44912009-04-01 07:07:16 -04002359static inline int sync_blockdev(struct block_device *bdev) { return 0; }
Al Viroff01bb42011-09-16 02:31:11 -04002360static inline void kill_bdev(struct block_device *bdev) {}
Al Viro47e44912009-04-01 07:07:16 -04002361static inline void invalidate_bdev(struct block_device *bdev) {}
2362
2363static inline struct super_block *freeze_bdev(struct block_device *sb)
2364{
2365 return NULL;
2366}
2367
2368static inline int thaw_bdev(struct block_device *bdev, struct super_block *sb)
2369{
2370 return 0;
2371}
Jan Kara5c0d6b62012-07-03 16:45:31 +02002372
2373static inline void iterate_bdevs(void (*f)(struct block_device *, void *), void *arg)
2374{
2375}
Jan Karaa8855992013-07-09 22:36:45 +08002376
Yaowei Bai3e004ee2015-11-17 14:40:09 +08002377static inline bool sb_is_blkdev_sb(struct super_block *sb)
Jan Karaa8855992013-07-09 22:36:45 +08002378{
Yaowei Bai3e004ee2015-11-17 14:40:09 +08002379 return false;
Jan Karaa8855992013-07-09 22:36:45 +08002380}
David Howells93614012006-09-30 20:45:40 +02002381#endif
Jan Kara60b06802009-04-27 16:43:53 +02002382extern int sync_filesystem(struct super_block *);
David Howells93614012006-09-30 20:45:40 +02002383extern const struct file_operations def_blk_fops;
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08002384extern const struct file_operations def_chr_fops;
David Howells93614012006-09-30 20:45:40 +02002385#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -07002386extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long);
Al Viro56b26ad2008-09-19 03:17:36 -04002387extern int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002388extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long);
Tejun Heoe525fd82010-11-13 11:55:17 +01002389extern int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder);
Tejun Heod4d77622010-11-13 11:55:18 +01002390extern struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
2391 void *holder);
2392extern struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode,
2393 void *holder);
Al Viro4385bab2013-05-05 22:11:03 -04002394extern void blkdev_put(struct block_device *bdev, fmode_t mode);
Jarod Wilsonbe324172015-05-06 12:26:22 +08002395extern int __blkdev_reread_part(struct block_device *bdev);
2396extern int blkdev_reread_part(struct block_device *bdev);
2397
Jun'ichi Nomura641dc632006-03-27 01:17:57 -08002398#ifdef CONFIG_SYSFS
Tejun Heoe09b4572010-11-13 11:55:17 +01002399extern int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk);
Tejun Heo49731ba2011-01-14 18:43:57 +01002400extern void bd_unlink_disk_holder(struct block_device *bdev,
2401 struct gendisk *disk);
Jun'ichi Nomura641dc632006-03-27 01:17:57 -08002402#else
Tejun Heoe09b4572010-11-13 11:55:17 +01002403static inline int bd_link_disk_holder(struct block_device *bdev,
2404 struct gendisk *disk)
2405{
2406 return 0;
2407}
Tejun Heo49731ba2011-01-14 18:43:57 +01002408static inline void bd_unlink_disk_holder(struct block_device *bdev,
2409 struct gendisk *disk)
2410{
2411}
Jun'ichi Nomura641dc632006-03-27 01:17:57 -08002412#endif
David Howells93614012006-09-30 20:45:40 +02002413#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002414
2415/* fs/char_dev.c */
Joe Korty68eef3b2006-03-31 02:30:32 -08002416#define CHRDEV_MAJOR_HASH_SIZE 255
Linus Walleij49db08c2016-02-19 15:36:07 +01002417/* Marks the bottom of the first segment of free char majors */
2418#define CHRDEV_MAJOR_DYN_END 234
Linus Torvalds1da177e2005-04-16 15:20:36 -07002419extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *);
2420extern int register_chrdev_region(dev_t, unsigned, const char *);
Tejun Heo1905b1b2009-08-06 18:13:23 +09002421extern int __register_chrdev(unsigned int major, unsigned int baseminor,
2422 unsigned int count, const char *name,
2423 const struct file_operations *fops);
2424extern void __unregister_chrdev(unsigned int major, unsigned int baseminor,
2425 unsigned int count, const char *name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002426extern void unregister_chrdev_region(dev_t, unsigned);
Joe Korty68eef3b2006-03-31 02:30:32 -08002427extern void chrdev_show(struct seq_file *,off_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002428
Tejun Heo1905b1b2009-08-06 18:13:23 +09002429static inline int register_chrdev(unsigned int major, const char *name,
2430 const struct file_operations *fops)
2431{
2432 return __register_chrdev(major, 0, 256, name, fops);
2433}
2434
2435static inline void unregister_chrdev(unsigned int major, const char *name)
2436{
2437 __unregister_chrdev(major, 0, 256, name);
2438}
2439
Linus Torvalds1da177e2005-04-16 15:20:36 -07002440/* fs/block_dev.c */
2441#define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
Tejun Heo1f014292008-08-25 19:47:23 +09002442#define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
David Howells93614012006-09-30 20:45:40 +02002443
2444#ifdef CONFIG_BLOCK
2445#define BLKDEV_MAJOR_HASH_SIZE 255
Linus Torvalds1da177e2005-04-16 15:20:36 -07002446extern const char *__bdevname(dev_t, char *buffer);
2447extern const char *bdevname(struct block_device *bdev, char *buffer);
2448extern struct block_device *lookup_bdev(const char *);
Joe Korty68eef3b2006-03-31 02:30:32 -08002449extern void blkdev_show(struct seq_file *,off_t);
Al Viro30c40d22008-02-22 19:50:45 -05002450
David Howells93614012006-09-30 20:45:40 +02002451#else
2452#define BLKDEV_MAJOR_HASH_SIZE 0
2453#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002454
2455extern void init_special_inode(struct inode *, umode_t, dev_t);
2456
2457/* Invalid inode operations -- fs/bad_inode.c */
2458extern void make_bad_inode(struct inode *);
Yaowei Bai0e3ef1f2015-11-19 21:00:11 +08002459extern bool is_bad_inode(struct inode *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002460
David Howells93614012006-09-30 20:45:40 +02002461#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -07002462/*
2463 * return READ, READA, or WRITE
2464 */
2465#define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK))
2466
2467/*
2468 * return data direction, READ or WRITE
2469 */
2470#define bio_data_dir(bio) ((bio)->bi_rw & 1)
2471
Andrew Pattersonc3279d12008-09-04 14:27:25 -06002472extern void check_disk_size_change(struct gendisk *disk,
2473 struct block_device *bdev);
Andrew Patterson0c002c22008-09-04 14:27:20 -06002474extern int revalidate_disk(struct gendisk *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002475extern int check_disk_change(struct block_device *);
NeilBrown93b270f2011-02-24 17:25:47 +11002476extern int __invalidate_device(struct block_device *, bool);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002477extern int invalidate_partition(struct gendisk *, int);
David Howells93614012006-09-30 20:45:40 +02002478#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002479unsigned long invalidate_mapping_pages(struct address_space *mapping,
2480 pgoff_t start, pgoff_t end);
Anton Altaparmakov54bc4852007-02-10 01:45:38 -08002481
Linus Torvalds1da177e2005-04-16 15:20:36 -07002482static inline void invalidate_remote_inode(struct inode *inode)
2483{
2484 if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
2485 S_ISLNK(inode->i_mode))
Andrew Mortonfc0ecff2007-02-10 01:45:39 -08002486 invalidate_mapping_pages(inode->i_mapping, 0, -1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002487}
2488extern int invalidate_inode_pages2(struct address_space *mapping);
2489extern int invalidate_inode_pages2_range(struct address_space *mapping,
2490 pgoff_t start, pgoff_t end);
2491extern int write_inode_now(struct inode *, int);
2492extern int filemap_fdatawrite(struct address_space *);
2493extern int filemap_flush(struct address_space *);
2494extern int filemap_fdatawait(struct address_space *);
Junichi Nomuraaa750fd2015-11-05 18:47:23 -08002495extern void filemap_fdatawait_keep_errors(struct address_space *);
Jan Karad3bccb6f2009-08-17 19:30:27 +02002496extern int filemap_fdatawait_range(struct address_space *, loff_t lstart,
2497 loff_t lend);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002498extern int filemap_write_and_wait(struct address_space *mapping);
2499extern int filemap_write_and_wait_range(struct address_space *mapping,
2500 loff_t lstart, loff_t lend);
Andrew Mortonebcf28e2006-03-24 03:18:04 -08002501extern int __filemap_fdatawrite_range(struct address_space *mapping,
2502 loff_t start, loff_t end, int sync_mode);
Jan Karaf4c0a0f2008-07-11 19:27:31 -04002503extern int filemap_fdatawrite_range(struct address_space *mapping,
2504 loff_t start, loff_t end);
Andrew Mortonebcf28e2006-03-24 03:18:04 -08002505
Christoph Hellwig8018ab02010-03-22 17:32:25 +01002506extern int vfs_fsync_range(struct file *file, loff_t start, loff_t end,
2507 int datasync);
2508extern int vfs_fsync(struct file *file, int datasync);
Christoph Hellwige2592212016-04-07 08:52:01 -07002509
2510/*
2511 * Sync the bytes written if this was a synchronous write. Expect ki_pos
2512 * to already be updated for the write, and will return either the amount
2513 * of bytes passed in, or an error if syncing the file failed.
2514 */
2515static inline ssize_t generic_write_sync(struct kiocb *iocb, ssize_t count)
Al Virod311d792014-02-09 15:18:09 -05002516{
Christoph Hellwige2592212016-04-07 08:52:01 -07002517 if (iocb->ki_flags & IOCB_DSYNC) {
2518 int ret = vfs_fsync_range(iocb->ki_filp,
2519 iocb->ki_pos - count, iocb->ki_pos - 1,
2520 (iocb->ki_flags & IOCB_SYNC) ? 0 : 1);
2521 if (ret)
2522 return ret;
2523 }
2524
2525 return count;
Al Virod311d792014-02-09 15:18:09 -05002526}
Christoph Hellwige2592212016-04-07 08:52:01 -07002527
Linus Torvalds1da177e2005-04-16 15:20:36 -07002528extern void emergency_sync(void);
2529extern void emergency_remount(void);
David Howells93614012006-09-30 20:45:40 +02002530#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -07002531extern sector_t bmap(struct inode *, sector_t);
David Howells93614012006-09-30 20:45:40 +02002532#endif
J. Bruce Fields27ac0ff2011-09-20 17:19:26 -04002533extern int notify_change(struct dentry *, struct iattr *, struct inode **);
Al Virof419a2e2008-07-22 00:07:17 -04002534extern int inode_permission(struct inode *, int);
Miklos Szeredibd5d0852014-10-24 00:14:35 +02002535extern int __inode_permission(struct inode *, int);
Al Viro2830ba72011-06-20 19:16:29 -04002536extern int generic_permission(struct inode *, int);
Miklos Szeredicbdf35b2014-10-24 00:14:36 +02002537extern int __check_sticky(struct inode *dir, struct inode *inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002538
Miklos Szeredif696a362008-07-31 13:41:58 +02002539static inline bool execute_ok(struct inode *inode)
2540{
2541 return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode);
2542}
2543
Al Viro8d71db42013-03-19 21:01:03 -04002544static inline void file_start_write(struct file *file)
2545{
2546 if (!S_ISREG(file_inode(file)->i_mode))
2547 return;
2548 __sb_start_write(file_inode(file)->i_sb, SB_FREEZE_WRITE, true);
2549}
2550
Jan Kara5ae98f12013-05-04 00:11:23 +02002551static inline bool file_start_write_trylock(struct file *file)
2552{
2553 if (!S_ISREG(file_inode(file)->i_mode))
2554 return true;
2555 return __sb_start_write(file_inode(file)->i_sb, SB_FREEZE_WRITE, false);
2556}
2557
Al Viro8d71db42013-03-19 21:01:03 -04002558static inline void file_end_write(struct file *file)
2559{
2560 if (!S_ISREG(file_inode(file)->i_mode))
2561 return;
2562 __sb_end_write(file_inode(file)->i_sb, SB_FREEZE_WRITE);
2563}
2564
Al Viro07b8ce12011-06-20 10:52:57 -04002565/*
2566 * get_write_access() gets write permission for a file.
2567 * put_write_access() releases this write permission.
2568 * This is used for regular files.
2569 * We cannot support write (and maybe mmap read-write shared) accesses and
2570 * MAP_DENYWRITE mmappings simultaneously. The i_writecount field of an inode
2571 * can have the following values:
2572 * 0: no writers, no VM_DENYWRITE mappings
2573 * < 0: (-i_writecount) vm_area_structs with VM_DENYWRITE set exist
2574 * > 0: (i_writecount) users are writing to the file.
2575 *
2576 * Normally we operate on that counter with atomic_{inc,dec} and it's safe
2577 * except for the cases where we don't hold i_writecount yet. Then we need to
2578 * use {get,deny}_write_access() - these functions check the sign and refuse
2579 * to do the change if sign is wrong.
2580 */
2581static inline int get_write_access(struct inode *inode)
2582{
2583 return atomic_inc_unless_negative(&inode->i_writecount) ? 0 : -ETXTBSY;
2584}
2585static inline int deny_write_access(struct file *file)
2586{
Al Viro496ad9a2013-01-23 17:07:38 -05002587 struct inode *inode = file_inode(file);
Al Viro07b8ce12011-06-20 10:52:57 -04002588 return atomic_dec_unless_positive(&inode->i_writecount) ? 0 : -ETXTBSY;
2589}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002590static inline void put_write_access(struct inode * inode)
2591{
2592 atomic_dec(&inode->i_writecount);
2593}
2594static inline void allow_write_access(struct file *file)
2595{
2596 if (file)
Al Viro496ad9a2013-01-23 17:07:38 -05002597 atomic_inc(&file_inode(file)->i_writecount);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002598}
David Howellsf1fe29b2013-09-27 11:20:03 +01002599static inline bool inode_is_open_for_write(const struct inode *inode)
2600{
2601 return atomic_read(&inode->i_writecount) > 0;
2602}
2603
Mimi Zohara5c96eb2010-11-02 10:11:37 -04002604#ifdef CONFIG_IMA
2605static inline void i_readcount_dec(struct inode *inode)
2606{
2607 BUG_ON(!atomic_read(&inode->i_readcount));
2608 atomic_dec(&inode->i_readcount);
2609}
2610static inline void i_readcount_inc(struct inode *inode)
2611{
2612 atomic_inc(&inode->i_readcount);
2613}
2614#else
2615static inline void i_readcount_dec(struct inode *inode)
2616{
2617 return;
2618}
2619static inline void i_readcount_inc(struct inode *inode)
2620{
2621 return;
2622}
2623#endif
Ulrich Dreppered8cae82008-07-23 21:29:30 -07002624extern int do_pipe_flags(int *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002625
Mimi Zohar1284ab52016-04-20 15:46:27 -07002626#define __kernel_read_file_id(id) \
2627 id(UNKNOWN, unknown) \
2628 id(FIRMWARE, firmware) \
2629 id(MODULE, kernel-module) \
2630 id(KEXEC_IMAGE, kexec-image) \
2631 id(KEXEC_INITRAMFS, kexec-initramfs) \
2632 id(POLICY, security-policy) \
2633 id(MAX_ID, )
2634
2635#define __fid_enumify(ENUM, dummy) READING_ ## ENUM,
2636#define __fid_stringify(dummy, str) #str,
2637
Mimi Zoharbc8ca5b2016-01-24 10:07:32 -05002638enum kernel_read_file_id {
Mimi Zohar1284ab52016-04-20 15:46:27 -07002639 __kernel_read_file_id(__fid_enumify)
Mimi Zoharbc8ca5b2016-01-24 10:07:32 -05002640};
2641
Mimi Zohar1284ab52016-04-20 15:46:27 -07002642static const char * const kernel_read_file_str[] = {
2643 __kernel_read_file_id(__fid_stringify)
2644};
2645
Kees Cookda20dfe2016-04-21 12:53:29 -07002646static inline const char *kernel_read_file_id_str(enum kernel_read_file_id id)
Mimi Zohar1284ab52016-04-20 15:46:27 -07002647{
2648 if (id < 0 || id >= READING_MAX_ID)
2649 return kernel_read_file_str[READING_UNKNOWN];
2650
2651 return kernel_read_file_str[id];
2652}
2653
Mimi Zohar6777d772009-08-21 14:32:48 -04002654extern int kernel_read(struct file *, loff_t, char *, unsigned long);
Mimi Zoharbc8ca5b2016-01-24 10:07:32 -05002655extern int kernel_read_file(struct file *, void **, loff_t *, loff_t,
2656 enum kernel_read_file_id);
Mimi Zohar09596b92015-11-19 12:39:22 -05002657extern int kernel_read_file_from_path(char *, void **, loff_t *, loff_t,
2658 enum kernel_read_file_id);
Mimi Zoharb844f0e2016-02-01 08:36:21 -05002659extern int kernel_read_file_from_fd(int, void **, loff_t *, loff_t,
2660 enum kernel_read_file_id);
Al Viro7bb307e2013-02-23 14:51:48 -05002661extern ssize_t kernel_write(struct file *, const char *, size_t, loff_t);
Al Viroed447242014-04-19 14:37:20 -04002662extern ssize_t __kernel_write(struct file *, const char *, size_t, loff_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002663extern struct file * open_exec(const char *);
2664
2665/* fs/dcache.c -- generic fs support functions */
Yaowei Baia6e57872015-11-17 14:40:11 +08002666extern bool is_subdir(struct dentry *, struct dentry *);
Yaowei Bai25ab4c92015-11-17 14:40:10 +08002667extern bool path_is_under(struct path *, struct path *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002668
Miklos Szeredi9bf39ab2015-06-19 10:29:13 +02002669extern char *file_path(struct file *, char *, int);
2670
Linus Torvalds1da177e2005-04-16 15:20:36 -07002671#include <linux/err.h>
2672
2673/* needed for stackable file system support */
Andrew Morton965c8e52012-12-17 15:59:39 -08002674extern loff_t default_llseek(struct file *file, loff_t offset, int whence);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002675
Andrew Morton965c8e52012-12-17 15:59:39 -08002676extern loff_t vfs_llseek(struct file *file, loff_t offset, int whence);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002677
Christoph Hellwig54e34622009-08-07 14:38:25 -03002678extern int inode_init_always(struct super_block *, struct inode *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002679extern void inode_init_once(struct inode *);
Miklos Szeredi2aa15892011-02-23 13:49:47 +01002680extern void address_space_init_once(struct address_space *mapping);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002681extern struct inode * igrab(struct inode *);
2682extern ino_t iunique(struct super_block *, ino_t);
2683extern int inode_needs_sync(struct inode *inode);
Al Viro45321ac2010-06-07 13:43:19 -04002684extern int generic_delete_inode(struct inode *inode);
Al Viro9bcb4b72012-02-12 19:43:17 -05002685static inline int generic_drop_inode(struct inode *inode)
2686{
2687 return !inode->i_nlink || inode_unhashed(inode);
2688}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002689
Anton Altaparmakov88bd5122005-07-13 01:10:44 -07002690extern struct inode *ilookup5_nowait(struct super_block *sb,
2691 unsigned long hashval, int (*test)(struct inode *, void *),
2692 void *data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002693extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval,
2694 int (*test)(struct inode *, void *), void *data);
2695extern struct inode *ilookup(struct super_block *sb, unsigned long ino);
2696
2697extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *);
2698extern struct inode * iget_locked(struct super_block *, unsigned long);
Theodore Ts'ofe032c42015-02-02 00:37:01 -05002699extern struct inode *find_inode_nowait(struct super_block *,
2700 unsigned long,
2701 int (*match)(struct inode *,
2702 unsigned long, void *),
2703 void *data);
Al Viro261bca82008-12-30 01:48:21 -05002704extern int insert_inode_locked4(struct inode *, unsigned long, int (*test)(struct inode *, void *), void *);
2705extern int insert_inode_locked(struct inode *);
Josh Boyere096d0c2011-08-25 07:48:12 -04002706#ifdef CONFIG_DEBUG_LOCK_ALLOC
2707extern void lockdep_annotate_inode_mutex_key(struct inode *inode);
2708#else
2709static inline void lockdep_annotate_inode_mutex_key(struct inode *inode) { };
2710#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002711extern void unlock_new_inode(struct inode *);
Christoph Hellwig85fe4022010-10-23 11:19:54 -04002712extern unsigned int get_next_ino(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002713
Linus Torvalds1da177e2005-04-16 15:20:36 -07002714extern void __iget(struct inode * inode);
David Howellsb46980f2008-02-07 00:15:27 -08002715extern void iget_failed(struct inode *);
Jan Karadbd57682012-05-03 14:48:02 +02002716extern void clear_inode(struct inode *);
Christoph Hellwig2e00c972009-08-07 14:38:29 -03002717extern void __destroy_inode(struct inode *);
Eric Dumazeta209dfc2011-07-26 11:36:34 +02002718extern struct inode *new_inode_pseudo(struct super_block *sb);
2719extern struct inode *new_inode(struct super_block *sb);
Nick Pigginff0c7d12011-01-07 17:49:50 +11002720extern void free_inode_nonrcu(struct inode *inode);
Jens Axboe01de85e2006-10-17 19:50:36 +02002721extern int should_remove_suid(struct dentry *);
Jan Kara5fa8e0a2015-05-21 16:05:53 +02002722extern int file_remove_privs(struct file *);
Jan Kara45f147a2015-05-21 16:05:55 +02002723extern int dentry_needs_remove_privs(struct dentry *dentry);
2724static inline int file_needs_remove_privs(struct file *file)
2725{
2726 return dentry_needs_remove_privs(file->f_path.dentry);
2727}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002728
2729extern void __insert_inode_hash(struct inode *, unsigned long hashval);
Christoph Hellwig646ec462010-10-23 07:15:32 -04002730static inline void insert_inode_hash(struct inode *inode)
2731{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002732 __insert_inode_hash(inode, inode->i_ino);
2733}
Eric Dumazetf2ee7ab2011-07-28 06:41:09 +02002734
2735extern void __remove_inode_hash(struct inode *);
2736static inline void remove_inode_hash(struct inode *inode)
2737{
Josef Bacikcbedaac2015-03-12 08:19:11 -04002738 if (!inode_unhashed(inode) && !hlist_fake(&inode->i_hash))
Eric Dumazetf2ee7ab2011-07-28 06:41:09 +02002739 __remove_inode_hash(inode);
2740}
2741
Christoph Hellwig646ec462010-10-23 07:15:32 -04002742extern void inode_sb_list_add(struct inode *inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002743
David Howells93614012006-09-30 20:45:40 +02002744#ifdef CONFIG_BLOCK
Jens Axboedece1632015-11-05 10:41:16 -07002745extern blk_qc_t submit_bio(int, struct bio *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002746extern int bdev_read_only(struct block_device *);
David Howells93614012006-09-30 20:45:40 +02002747#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002748extern int set_blocksize(struct block_device *, int);
2749extern int sb_set_blocksize(struct super_block *, int);
2750extern int sb_min_blocksize(struct super_block *, int);
2751
2752extern int generic_file_mmap(struct file *, struct vm_area_struct *);
2753extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *);
Al Viro3309dd02015-04-09 12:55:47 -04002754extern ssize_t generic_write_checks(struct kiocb *, struct iov_iter *);
Al Viroed978a82014-03-05 22:53:04 -05002755extern ssize_t generic_file_read_iter(struct kiocb *, struct iov_iter *);
Al Viro81742022014-04-03 03:17:43 -04002756extern ssize_t __generic_file_write_iter(struct kiocb *, struct iov_iter *);
Al Viro81742022014-04-03 03:17:43 -04002757extern ssize_t generic_file_write_iter(struct kiocb *, struct iov_iter *);
Christoph Hellwig1af5bb42016-04-07 08:51:56 -07002758extern ssize_t generic_file_direct_write(struct kiocb *, struct iov_iter *);
Al Viro3b93f912014-02-11 21:34:08 -05002759extern ssize_t generic_perform_write(struct file *, struct iov_iter *, loff_t);
Andrew Morton88e6fae2006-04-11 13:59:36 +02002760
Christoph Hellwigdbe4e192015-01-25 21:11:59 +01002761ssize_t vfs_iter_read(struct file *file, struct iov_iter *iter, loff_t *ppos);
2762ssize_t vfs_iter_write(struct file *file, struct iov_iter *iter, loff_t *ppos);
2763
Christoph Hellwigeef99382009-08-20 17:43:41 +02002764/* fs/block_dev.c */
David Jefferyb2de5252014-09-29 10:21:10 -04002765extern ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to);
Al Viro1456c0a2014-04-03 03:21:50 -04002766extern ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from);
Josef Bacik02c24a82011-07-16 20:44:56 -04002767extern int blkdev_fsync(struct file *filp, loff_t start, loff_t end,
2768 int datasync);
Al Viroff01bb42011-09-16 02:31:11 -04002769extern void block_sync_page(struct page *page);
Christoph Hellwigeef99382009-08-20 17:43:41 +02002770
Andrew Morton88e6fae2006-04-11 13:59:36 +02002771/* fs/splice.c */
Jens Axboecbb7e572006-04-11 14:57:50 +02002772extern ssize_t generic_file_splice_read(struct file *, loff_t *,
Andrew Morton88e6fae2006-04-11 13:59:36 +02002773 struct pipe_inode_info *, size_t, unsigned int);
Miklos Szeredi68181732009-05-07 15:37:36 +02002774extern ssize_t default_file_splice_read(struct file *, loff_t *,
2775 struct pipe_inode_info *, size_t, unsigned int);
Al Viro8d020762014-04-05 04:27:08 -04002776extern ssize_t iter_file_splice_write(struct pipe_inode_info *,
Jens Axboecbb7e572006-04-11 14:57:50 +02002777 struct file *, loff_t *, size_t, unsigned int);
Andrew Morton88e6fae2006-04-11 13:59:36 +02002778extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe,
Jens Axboecbb7e572006-04-11 14:57:50 +02002779 struct file *out, loff_t *, size_t len, unsigned int flags);
Miklos Szeredi1c118592014-10-24 00:14:35 +02002780extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
2781 loff_t *opos, size_t len, unsigned int flags);
2782
Andrew Morton88e6fae2006-04-11 13:59:36 +02002783
Linus Torvalds1da177e2005-04-16 15:20:36 -07002784extern void
2785file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
Andrew Morton965c8e52012-12-17 15:59:39 -08002786extern loff_t noop_llseek(struct file *file, loff_t offset, int whence);
2787extern loff_t no_llseek(struct file *file, loff_t offset, int whence);
Jie Liu46a1c2c2013-06-25 12:02:13 +08002788extern loff_t vfs_setpos(struct file *file, loff_t offset, loff_t maxsize);
Andrew Morton965c8e52012-12-17 15:59:39 -08002789extern loff_t generic_file_llseek(struct file *file, loff_t offset, int whence);
Andi Kleen57604952011-09-15 16:06:50 -07002790extern loff_t generic_file_llseek_size(struct file *file, loff_t offset,
Andrew Morton965c8e52012-12-17 15:59:39 -08002791 int whence, loff_t maxsize, loff_t eof);
Al Viro1bf9d142013-06-16 20:27:42 +04002792extern loff_t fixed_size_llseek(struct file *file, loff_t offset,
2793 int whence, loff_t size);
Al Virob25472f2015-12-05 22:04:48 -05002794extern loff_t no_seek_end_llseek_size(struct file *, loff_t, int, loff_t);
2795extern loff_t no_seek_end_llseek(struct file *, loff_t, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002796extern int generic_file_open(struct inode * inode, struct file * filp);
2797extern int nonseekable_open(struct inode * inode, struct file * filp);
2798
David Howells93614012006-09-30 20:45:40 +02002799#ifdef CONFIG_BLOCK
Josef Bacikfacd07b2010-05-23 11:00:55 -04002800typedef void (dio_submit_t)(int rw, struct bio *bio, struct inode *inode,
2801 loff_t file_offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002802
2803enum {
Christoph Hellwig1e431f52009-11-03 16:44:53 +01002804 /* need locking between buffered and direct access */
2805 DIO_LOCKING = 0x01,
2806
2807 /* filesystem does not support filling holes */
2808 DIO_SKIP_HOLES = 0x02,
Christoph Hellwig60392572014-02-10 10:27:11 +11002809
2810 /* filesystem can handle aio writes beyond i_size */
2811 DIO_ASYNC_EXTEND = 0x04,
Jens Axboefe0f07d2015-04-15 17:05:48 -06002812
2813 /* inode/fs/bdev does not need truncate protection */
2814 DIO_SKIP_DIO_COUNT = 0x08,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002815};
2816
Christoph Hellwigeafdc7d2010-06-04 11:29:53 +02002817void dio_end_io(struct bio *bio, int error);
npiggin@suse.de7bb46a62010-05-27 01:05:33 +10002818
Omar Sandoval17f8c842015-03-16 04:33:50 -07002819ssize_t __blockdev_direct_IO(struct kiocb *iocb, struct inode *inode,
2820 struct block_device *bdev, struct iov_iter *iter,
Christoph Hellwigc8b8e322016-04-07 08:51:58 -07002821 get_block_t get_block,
Omar Sandoval17f8c842015-03-16 04:33:50 -07002822 dio_iodone_t end_io, dio_submit_t submit_io,
2823 int flags);
Christoph Hellwigeafdc7d2010-06-04 11:29:53 +02002824
Omar Sandoval17f8c842015-03-16 04:33:50 -07002825static inline ssize_t blockdev_direct_IO(struct kiocb *iocb,
2826 struct inode *inode,
Christoph Hellwigc8b8e322016-04-07 08:51:58 -07002827 struct iov_iter *iter,
Omar Sandoval17f8c842015-03-16 04:33:50 -07002828 get_block_t get_block)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002829{
Omar Sandoval17f8c842015-03-16 04:33:50 -07002830 return __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev, iter,
Christoph Hellwigc8b8e322016-04-07 08:51:58 -07002831 get_block, NULL, NULL, DIO_LOCKING | DIO_SKIP_HOLES);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002832}
David Howells93614012006-09-30 20:45:40 +02002833#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002834
Trond Myklebust1d59d612012-05-31 12:22:33 -04002835void inode_dio_wait(struct inode *inode);
Jens Axboefe0f07d2015-04-15 17:05:48 -06002836
2837/*
2838 * inode_dio_begin - signal start of a direct I/O requests
2839 * @inode: inode the direct I/O happens on
2840 *
2841 * This is called once we've finished processing a direct I/O request,
2842 * and is used to wake up callers waiting for direct I/O to be quiesced.
2843 */
2844static inline void inode_dio_begin(struct inode *inode)
2845{
2846 atomic_inc(&inode->i_dio_count);
2847}
2848
2849/*
2850 * inode_dio_end - signal finish of a direct I/O requests
2851 * @inode: inode the direct I/O happens on
2852 *
2853 * This is called once we've finished processing a direct I/O request,
2854 * and is used to wake up callers waiting for direct I/O to be quiesced.
2855 */
2856static inline void inode_dio_end(struct inode *inode)
2857{
2858 if (atomic_dec_and_test(&inode->i_dio_count))
2859 wake_up_bit(&inode->i_state, __I_DIO_WAKEUP);
2860}
Trond Myklebust1d59d612012-05-31 12:22:33 -04002861
Theodore Ts'o5f16f322014-03-24 14:43:12 -04002862extern void inode_set_flags(struct inode *inode, unsigned int flags,
2863 unsigned int mask);
2864
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08002865extern const struct file_operations generic_ro_fops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002866
2867#define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
2868
Al Viro5d826c82014-03-14 13:42:45 -04002869extern int readlink_copy(char __user *, int, const char *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002870extern int page_readlink(struct dentry *, char __user *, int);
Al Virofceef392015-12-29 15:58:39 -05002871extern const char *page_get_link(struct dentry *, struct inode *,
2872 struct delayed_call *);
2873extern void page_put_link(void *);
Kirill Korotaev0adb25d2006-03-11 03:27:13 -08002874extern int __page_symlink(struct inode *inode, const char *symname, int len,
Nick Piggin54566b22009-01-04 12:00:53 -08002875 int nofs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002876extern int page_symlink(struct inode *inode, const char *symname, int len);
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08002877extern const struct inode_operations page_symlink_inode_operations;
Al Virofceef392015-12-29 15:58:39 -05002878extern void kfree_link(void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002879extern int generic_readlink(struct dentry *, char __user *, int);
2880extern void generic_fillattr(struct inode *, struct kstat *);
J. Bruce Fieldsb7a6ec52013-10-02 17:01:18 -04002881int vfs_getattr_nosec(struct path *path, struct kstat *stat);
Al Viro3dadecc2013-01-24 02:18:08 -05002882extern int vfs_getattr(struct path *, struct kstat *);
Dmitry Monakhovb4627072009-12-14 15:21:12 +03002883void __inode_add_bytes(struct inode *inode, loff_t bytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002884void inode_add_bytes(struct inode *inode, loff_t bytes);
Jan Kara1c8924e2013-08-17 09:32:32 -04002885void __inode_sub_bytes(struct inode *inode, loff_t bytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002886void inode_sub_bytes(struct inode *inode, loff_t bytes);
2887loff_t inode_get_bytes(struct inode *inode);
2888void inode_set_bytes(struct inode *inode, loff_t bytes);
Al Virofceef392015-12-29 15:58:39 -05002889const char *simple_get_link(struct dentry *, struct inode *,
2890 struct delayed_call *);
Al Viro61ba64f2015-05-02 09:54:06 -04002891extern const struct inode_operations simple_symlink_inode_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002892
Al Viro5c0ba4e2013-05-15 13:52:59 -04002893extern int iterate_dir(struct file *, struct dir_context *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002894
David Howellsc7887322010-08-11 11:26:22 +01002895extern int vfs_stat(const char __user *, struct kstat *);
2896extern int vfs_lstat(const char __user *, struct kstat *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002897extern int vfs_fstat(unsigned int, struct kstat *);
David Howellsc7887322010-08-11 11:26:22 +01002898extern int vfs_fstatat(int , const char __user *, struct kstat *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002899
Steven Whitehousee9079cc2008-10-14 14:43:29 +01002900extern int __generic_block_fiemap(struct inode *inode,
Josef Bacik3a3076f2010-04-23 12:17:17 -04002901 struct fiemap_extent_info *fieinfo,
2902 loff_t start, loff_t len,
2903 get_block_t *get_block);
Josef Bacik68c9d702008-10-03 17:32:43 -04002904extern int generic_block_fiemap(struct inode *inode,
2905 struct fiemap_extent_info *fieinfo, u64 start,
2906 u64 len, get_block_t *get_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002907
Miklos Szeredic18479f2007-10-18 23:39:11 -07002908extern void get_filesystem(struct file_system_type *fs);
2909extern void put_filesystem(struct file_system_type *fs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002910extern struct file_system_type *get_fs_type(const char *name);
2911extern struct super_block *get_super(struct block_device *);
Jan Kara6b6dc832012-02-10 11:03:00 +01002912extern struct super_block *get_super_thawed(struct block_device *);
Christoph Hellwig45042302009-08-03 23:28:35 +02002913extern struct super_block *get_active_super(struct block_device *bdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002914extern void drop_super(struct super_block *sb);
Al Viro01a05b32010-03-23 06:06:58 -04002915extern void iterate_supers(void (*)(struct super_block *, void *), void *);
Al Viro43e15cd2011-06-03 20:16:57 -04002916extern void iterate_supers_type(struct file_system_type *,
2917 void (*)(struct super_block *, void *), void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002918
2919extern int dcache_dir_open(struct inode *, struct file *);
2920extern int dcache_dir_close(struct inode *, struct file *);
2921extern loff_t dcache_dir_lseek(struct file *, loff_t, int);
Al Viro5f99f4e2013-05-15 20:23:06 -04002922extern int dcache_readdir(struct file *, struct dir_context *);
npiggin@suse.de7bb46a62010-05-27 01:05:33 +10002923extern int simple_setattr(struct dentry *, struct iattr *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002924extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *);
David Howells726c3342006-06-23 02:02:58 -07002925extern int simple_statfs(struct dentry *, struct kstatfs *);
Stephen Boyd20955e82012-04-05 14:25:09 -07002926extern int simple_open(struct inode *inode, struct file *file);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002927extern int simple_link(struct dentry *, struct inode *, struct dentry *);
2928extern int simple_unlink(struct inode *, struct dentry *);
2929extern int simple_rmdir(struct inode *, struct dentry *);
2930extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
Josef Bacik02c24a82011-07-16 20:44:56 -04002931extern int noop_fsync(struct file *, loff_t, loff_t, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002932extern int simple_empty(struct dentry *);
2933extern int simple_readpage(struct file *file, struct page *page);
Nick Pigginafddba42007-10-16 01:25:01 -07002934extern int simple_write_begin(struct file *file, struct address_space *mapping,
2935 loff_t pos, unsigned len, unsigned flags,
2936 struct page **pagep, void **fsdata);
2937extern int simple_write_end(struct file *file, struct address_space *mapping,
2938 loff_t pos, unsigned len, unsigned copied,
2939 struct page *page, void *fsdata);
Al Virob26d4cd2013-10-25 18:47:37 -04002940extern int always_delete_dentry(const struct dentry *);
Al Viro69878432013-10-02 22:35:11 -04002941extern struct inode *alloc_anon_inode(struct super_block *);
Jeff Laytone6f5c782014-08-22 10:40:25 -04002942extern int simple_nosetlease(struct file *, long, struct file_lock **, void **);
Al Virob26d4cd2013-10-25 18:47:37 -04002943extern const struct dentry_operations simple_dentry_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002944
Al Viro00cd8dd2012-06-10 17:13:09 -04002945extern struct dentry *simple_lookup(struct inode *, struct dentry *, unsigned int flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002946extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *);
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08002947extern const struct file_operations simple_dir_operations;
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08002948extern const struct inode_operations simple_dir_inode_operations;
Eric W. Biedermanfbabfd02015-05-09 15:54:49 -05002949extern void make_empty_dir_inode(struct inode *inode);
2950extern bool is_empty_dir_inode(struct inode *inode);
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08002951struct tree_descr { char *name; const struct file_operations *ops; int mode; };
Linus Torvalds1da177e2005-04-16 15:20:36 -07002952struct dentry *d_alloc_name(struct dentry *, const char *);
Roberto Sassu7d683a02010-06-03 11:58:28 +02002953extern int simple_fill_super(struct super_block *, unsigned long, struct tree_descr *);
Trond Myklebust1f5ce9e2006-06-09 09:34:16 -04002954extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002955extern void simple_release_fs(struct vfsmount **mount, int *count);
2956
Akinobu Mita93b07112008-06-05 22:46:21 -07002957extern ssize_t simple_read_from_buffer(void __user *to, size_t count,
2958 loff_t *ppos, const void *from, size_t available);
Jiri Slaby6a727b42010-05-01 23:51:22 +02002959extern ssize_t simple_write_to_buffer(void *to, size_t available, loff_t *ppos,
2960 const void __user *from, size_t count);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002961
Fabian Frederickac13a822014-06-04 16:06:27 -07002962extern int __generic_file_fsync(struct file *, loff_t, loff_t, int);
Josef Bacik02c24a82011-07-16 20:44:56 -04002963extern int generic_file_fsync(struct file *, loff_t, loff_t, int);
Al Virod5aacad2009-06-07 14:56:44 -04002964
Patrick J. LoPresti30ca22c2010-07-22 15:03:41 -07002965extern int generic_check_addressable(unsigned, u64);
2966
Christoph Lametere965f962006-02-01 03:05:41 -08002967#ifdef CONFIG_MIGRATION
Christoph Lameter2d1db3b2006-06-23 02:03:33 -07002968extern int buffer_migrate_page(struct address_space *,
Mel Gormana6bc32b2012-01-12 17:19:43 -08002969 struct page *, struct page *,
2970 enum migrate_mode);
Christoph Lametere965f962006-02-01 03:05:41 -08002971#else
2972#define buffer_migrate_page NULL
2973#endif
2974
npiggin@suse.de25d9e2d2009-08-21 02:35:05 +10002975extern int inode_change_ok(const struct inode *, struct iattr *);
2976extern int inode_newsize_ok(const struct inode *, loff_t offset);
Christoph Hellwig6a1a90a2010-06-04 11:30:00 +02002977extern void setattr_copy(struct inode *inode, const struct iattr *attr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002978
Josef Bacikc3b2da32012-03-26 09:59:21 -04002979extern int file_update_time(struct file *file);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002980
Al Viro34c80b12011-12-08 21:32:45 -05002981extern int generic_show_options(struct seq_file *m, struct dentry *root);
Miklos Szeredib3b304a2008-02-08 04:21:35 -08002982extern void save_mount_options(struct super_block *sb, char *options);
Al Viro2a32ceb2009-05-08 16:05:57 -04002983extern void replace_mount_options(struct super_block *sb, char *options);
Miklos Szeredib3b304a2008-02-08 04:21:35 -08002984
Matthew Wilcoxd475c632015-02-16 15:58:56 -08002985static inline bool io_is_direct(struct file *filp)
2986{
Dan Williams65f87ee2016-01-25 17:23:18 -08002987 return (filp->f_flags & O_DIRECT) || IS_DAX(filp->f_mapping->host);
Matthew Wilcoxd475c632015-02-16 15:58:56 -08002988}
2989
Al Viro2ba48ce2015-04-09 13:52:01 -04002990static inline int iocb_flags(struct file *file)
2991{
2992 int res = 0;
2993 if (file->f_flags & O_APPEND)
2994 res |= IOCB_APPEND;
2995 if (io_is_direct(file))
2996 res |= IOCB_DIRECT;
Christoph Hellwigdde0c2e2016-04-07 08:52:00 -07002997 if ((file->f_flags & O_DSYNC) || IS_SYNC(file->f_mapping->host))
2998 res |= IOCB_DSYNC;
2999 if (file->f_flags & __O_SYNC)
3000 res |= IOCB_SYNC;
Al Viro2ba48ce2015-04-09 13:52:01 -04003001 return res;
3002}
3003
Linus Torvalds1da177e2005-04-16 15:20:36 -07003004static inline ino_t parent_ino(struct dentry *dentry)
3005{
3006 ino_t res;
3007
Nick Pigginb5c84bf2011-01-07 17:49:38 +11003008 /*
3009 * Don't strictly need d_lock here? If the parent ino could change
3010 * then surely we'd have a deeper race in the caller?
3011 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003012 spin_lock(&dentry->d_lock);
3013 res = dentry->d_parent->d_inode->i_ino;
3014 spin_unlock(&dentry->d_lock);
3015 return res;
3016}
3017
Linus Torvalds1da177e2005-04-16 15:20:36 -07003018/* Transaction based IO helpers */
3019
3020/*
3021 * An argresp is stored in an allocated page and holds the
3022 * size of the argument or response, along with its content
3023 */
3024struct simple_transaction_argresp {
3025 ssize_t size;
3026 char data[0];
3027};
3028
3029#define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))
3030
3031char *simple_transaction_get(struct file *file, const char __user *buf,
3032 size_t size);
3033ssize_t simple_transaction_read(struct file *file, char __user *buf,
3034 size_t size, loff_t *pos);
3035int simple_transaction_release(struct inode *inode, struct file *file);
3036
Ingo Molnar76791ab2009-03-25 16:48:35 +01003037void simple_transaction_set(struct file *file, size_t n);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003038
Arnd Bergmannacaefc22005-05-18 14:40:59 +02003039/*
3040 * simple attribute files
3041 *
3042 * These attributes behave similar to those in sysfs:
3043 *
3044 * Writing to an attribute immediately sets a value, an open file can be
3045 * written to multiple times.
3046 *
3047 * Reading from an attribute creates a buffer from the value that might get
3048 * read with multiple read calls. When the attribute has been read
3049 * completely, no further read calls are possible until the file is opened
3050 * again.
3051 *
3052 * All attributes contain a text representation of a numeric value
3053 * that are accessed with the get() and set() functions.
3054 */
3055#define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \
3056static int __fops ## _open(struct inode *inode, struct file *file) \
3057{ \
3058 __simple_attr_check_format(__fmt, 0ull); \
3059 return simple_attr_open(inode, file, __get, __set, __fmt); \
3060} \
Alexey Dobriyan828c0952009-10-01 15:43:56 -07003061static const struct file_operations __fops = { \
Arnd Bergmannacaefc22005-05-18 14:40:59 +02003062 .owner = THIS_MODULE, \
3063 .open = __fops ## _open, \
Christoph Hellwig74bedc42008-02-08 04:20:28 -08003064 .release = simple_attr_release, \
Arnd Bergmannacaefc22005-05-18 14:40:59 +02003065 .read = simple_attr_read, \
3066 .write = simple_attr_write, \
Arnd Bergmann1ec55842010-08-15 21:50:52 +02003067 .llseek = generic_file_llseek, \
Joe Perches68be3022014-08-06 16:08:45 -07003068}
Arnd Bergmannacaefc22005-05-18 14:40:59 +02003069
Joe Perchesb9075fa2011-10-31 17:11:33 -07003070static inline __printf(1, 2)
3071void __simple_attr_check_format(const char *fmt, ...)
Arnd Bergmannacaefc22005-05-18 14:40:59 +02003072{
3073 /* don't do anything, just let the compiler check the arguments; */
3074}
3075
3076int simple_attr_open(struct inode *inode, struct file *file,
Christoph Hellwig8b88b092008-02-08 04:20:26 -08003077 int (*get)(void *, u64 *), int (*set)(void *, u64),
Arnd Bergmannacaefc22005-05-18 14:40:59 +02003078 const char *fmt);
Christoph Hellwig74bedc42008-02-08 04:20:28 -08003079int simple_attr_release(struct inode *inode, struct file *file);
Arnd Bergmannacaefc22005-05-18 14:40:59 +02003080ssize_t simple_attr_read(struct file *file, char __user *buf,
3081 size_t len, loff_t *ppos);
3082ssize_t simple_attr_write(struct file *file, const char __user *buf,
3083 size_t len, loff_t *ppos);
3084
Alexey Dobriyan4be28542007-10-16 23:26:21 -07003085struct ctl_table;
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07003086int proc_nr_files(struct ctl_table *table, int write,
Adrian Bunk62239ac2007-07-17 04:03:45 -07003087 void __user *buffer, size_t *lenp, loff_t *ppos);
Christoph Hellwig312d3ca2010-10-10 05:36:23 -04003088int proc_nr_dentry(struct ctl_table *table, int write,
3089 void __user *buffer, size_t *lenp, loff_t *ppos);
Dave Chinnercffbc8a2010-10-23 05:03:02 -04003090int proc_nr_inodes(struct ctl_table *table, int write,
3091 void __user *buffer, size_t *lenp, loff_t *ppos);
Tetsuo Handa38e23c92009-04-09 20:17:52 +09003092int __init get_filesystem_list(char *buf);
Adrian Bunk62239ac2007-07-17 04:03:45 -07003093
Namhyung Kim3cd90ea2011-02-01 15:52:46 -08003094#define __FMODE_EXEC ((__force int) FMODE_EXEC)
Namhyung Kim1a44bc82011-02-01 15:52:46 -08003095#define __FMODE_NONOTIFY ((__force int) FMODE_NONOTIFY)
3096
Al Viro6d125522009-12-24 06:58:56 -05003097#define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE])
Eric Parisecf081d2009-12-17 21:24:25 -05003098#define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \
Namhyung Kim1a44bc82011-02-01 15:52:46 -08003099 (flag & __FMODE_NONOTIFY)))
Al Viro53009902009-12-19 10:15:07 -05003100
Yaowei Baid37177b2015-11-19 21:00:12 +08003101static inline bool is_sxid(umode_t mode)
Andi Kleen69b45732011-05-28 08:25:51 -07003102{
3103 return (mode & S_ISUID) || ((mode & S_ISGID) && (mode & S_IXGRP));
3104}
3105
Miklos Szeredicbdf35b2014-10-24 00:14:36 +02003106static inline int check_sticky(struct inode *dir, struct inode *inode)
3107{
3108 if (!(dir->i_mode & S_ISVTX))
3109 return 0;
3110
3111 return __check_sticky(dir, inode);
3112}
3113
Andi Kleen69b45732011-05-28 08:25:51 -07003114static inline void inode_has_no_xattr(struct inode *inode)
3115{
Al Viro9e1f1de2011-06-03 18:24:58 -04003116 if (!is_sxid(inode->i_mode) && (inode->i_sb->s_flags & MS_NOSEC))
Andi Kleen69b45732011-05-28 08:25:51 -07003117 inode->i_flags |= S_NOSEC;
3118}
3119
Al Viroa7400222014-10-21 15:20:42 -04003120static inline bool is_root_inode(struct inode *inode)
3121{
3122 return inode == inode->i_sb->s_root->d_inode;
3123}
3124
Al Viro5f99f4e2013-05-15 20:23:06 -04003125static inline bool dir_emit(struct dir_context *ctx,
3126 const char *name, int namelen,
3127 u64 ino, unsigned type)
3128{
3129 return ctx->actor(ctx, name, namelen, ctx->pos, ino, type) == 0;
3130}
3131static inline bool dir_emit_dot(struct file *file, struct dir_context *ctx)
3132{
3133 return ctx->actor(ctx, ".", 1, ctx->pos,
3134 file->f_path.dentry->d_inode->i_ino, DT_DIR) == 0;
3135}
3136static inline bool dir_emit_dotdot(struct file *file, struct dir_context *ctx)
3137{
3138 return ctx->actor(ctx, "..", 2, ctx->pos,
3139 parent_ino(file->f_path.dentry), DT_DIR) == 0;
3140}
3141static inline bool dir_emit_dots(struct file *file, struct dir_context *ctx)
3142{
3143 if (ctx->pos == 0) {
3144 if (!dir_emit_dot(file, ctx))
3145 return false;
3146 ctx->pos = 1;
3147 }
3148 if (ctx->pos == 1) {
3149 if (!dir_emit_dotdot(file, ctx))
3150 return false;
3151 ctx->pos = 2;
3152 }
3153 return true;
3154}
Al Viro5ded75e2013-05-15 21:02:48 -04003155static inline bool dir_relax(struct inode *inode)
3156{
Al Viro59551022016-01-22 15:40:57 -05003157 inode_unlock(inode);
3158 inode_lock(inode);
Al Viro5ded75e2013-05-15 21:02:48 -04003159 return !IS_DEADDIR(inode);
3160}
Al Viro5f99f4e2013-05-15 20:23:06 -04003161
Al Viroae053272016-05-12 20:36:01 -04003162static inline bool dir_relax_shared(struct inode *inode)
3163{
3164 inode_unlock_shared(inode);
3165 inode_lock_shared(inode);
3166 return !IS_DEADDIR(inode);
3167}
3168
Eric W. Biederman90f85722015-06-29 14:42:03 -05003169extern bool path_noexec(const struct path *path);
Al Viro21fc61c2015-11-17 01:07:57 -05003170extern void inode_nohighmem(struct inode *inode);
Eric W. Biederman90f85722015-06-29 14:42:03 -05003171
Linus Torvalds1da177e2005-04-16 15:20:36 -07003172#endif /* _LINUX_FS_H */