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v6.9.4
  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
  4 * All Rights Reserved.
  5 */
  6#ifndef	__XFS_INODE_H__
  7#define	__XFS_INODE_H__
  8
  9#include "xfs_inode_buf.h"
 10#include "xfs_inode_fork.h"
 
 11
 12/*
 13 * Kernel only inode definitions
 14 */
 15struct xfs_dinode;
 16struct xfs_inode;
 17struct xfs_buf;
 18struct xfs_bmbt_irec;
 19struct xfs_inode_log_item;
 20struct xfs_mount;
 21struct xfs_trans;
 22struct xfs_dquot;
 23
 24typedef struct xfs_inode {
 25	/* Inode linking and identification information. */
 26	struct xfs_mount	*i_mount;	/* fs mount struct ptr */
 27	struct xfs_dquot	*i_udquot;	/* user dquot */
 28	struct xfs_dquot	*i_gdquot;	/* group dquot */
 29	struct xfs_dquot	*i_pdquot;	/* project dquot */
 30
 31	/* Inode location stuff */
 32	xfs_ino_t		i_ino;		/* inode number (agno/agino)*/
 33	struct xfs_imap		i_imap;		/* location for xfs_imap() */
 34
 35	/* Extent information. */
 36	struct xfs_ifork	*i_cowfp;	/* copy on write extents */
 37	struct xfs_ifork	i_df;		/* data fork */
 38	struct xfs_ifork	i_af;		/* attribute fork */
 39
 40	/* Transaction and locking information. */
 41	struct xfs_inode_log_item *i_itemp;	/* logging information */
 42	struct rw_semaphore	i_lock;		/* inode lock */
 43	atomic_t		i_pincount;	/* inode pin count */
 44	struct llist_node	i_gclist;	/* deferred inactivation list */
 45
 46	/*
 47	 * Bitsets of inode metadata that have been checked and/or are sick.
 48	 * Callers must hold i_flags_lock before accessing this field.
 49	 */
 50	uint16_t		i_checked;
 51	uint16_t		i_sick;
 52
 53	spinlock_t		i_flags_lock;	/* inode i_flags lock */
 54	/* Miscellaneous state. */
 55	unsigned long		i_flags;	/* see defined flags below */
 56	uint64_t		i_delayed_blks;	/* count of delay alloc blks */
 57	xfs_fsize_t		i_disk_size;	/* number of bytes in file */
 58	xfs_rfsblock_t		i_nblocks;	/* # of direct & btree blocks */
 59	prid_t			i_projid;	/* owner's project id */
 60	xfs_extlen_t		i_extsize;	/* basic/minimum extent size */
 61	/* cowextsize is only used for v3 inodes, flushiter for v1/2 */
 62	union {
 63		xfs_extlen_t	i_cowextsize;	/* basic cow extent size */
 64		uint16_t	i_flushiter;	/* incremented on flush */
 65	};
 66	uint8_t			i_forkoff;	/* attr fork offset >> 3 */
 
 67	uint16_t		i_diflags;	/* XFS_DIFLAG_... */
 68	uint64_t		i_diflags2;	/* XFS_DIFLAG2_... */
 69	struct timespec64	i_crtime;	/* time created */
 70
 71	/*
 72	 * Unlinked list pointers.  These point to the next and previous inodes
 73	 * in the AGI unlinked bucket list, respectively.  These fields can
 74	 * only be updated with the AGI locked.
 75	 *
 76	 * i_next_unlinked caches di_next_unlinked.
 77	 */
 78	xfs_agino_t		i_next_unlinked;
 79
 80	/*
 81	 * If the inode is not on an unlinked list, this field is zero.  If the
 82	 * inode is the first element in an unlinked list, this field is
 83	 * NULLAGINO.  Otherwise, i_prev_unlinked points to the previous inode
 84	 * in the unlinked list.
 85	 */
 86	xfs_agino_t		i_prev_unlinked;
 87
 88	/* VFS inode */
 89	struct inode		i_vnode;	/* embedded VFS inode */
 90
 91	/* pending io completions */
 92	spinlock_t		i_ioend_lock;
 93	struct work_struct	i_ioend_work;
 94	struct list_head	i_ioend_list;
 95} xfs_inode_t;
 96
 97static inline bool xfs_inode_on_unlinked_list(const struct xfs_inode *ip)
 98{
 99	return ip->i_prev_unlinked != 0;
100}
101
102static inline bool xfs_inode_has_attr_fork(struct xfs_inode *ip)
103{
104	return ip->i_forkoff > 0;
105}
106
107static inline struct xfs_ifork *
108xfs_ifork_ptr(
109	struct xfs_inode	*ip,
110	int			whichfork)
111{
112	switch (whichfork) {
113	case XFS_DATA_FORK:
114		return &ip->i_df;
115	case XFS_ATTR_FORK:
116		if (!xfs_inode_has_attr_fork(ip))
117			return NULL;
118		return &ip->i_af;
119	case XFS_COW_FORK:
120		return ip->i_cowfp;
121	default:
122		ASSERT(0);
123		return NULL;
124	}
125}
126
127static inline unsigned int xfs_inode_fork_boff(struct xfs_inode *ip)
128{
129	return ip->i_forkoff << 3;
130}
131
132static inline unsigned int xfs_inode_data_fork_size(struct xfs_inode *ip)
133{
134	if (xfs_inode_has_attr_fork(ip))
135		return xfs_inode_fork_boff(ip);
136
137	return XFS_LITINO(ip->i_mount);
138}
139
140static inline unsigned int xfs_inode_attr_fork_size(struct xfs_inode *ip)
141{
142	if (xfs_inode_has_attr_fork(ip))
143		return XFS_LITINO(ip->i_mount) - xfs_inode_fork_boff(ip);
144	return 0;
145}
146
147static inline unsigned int
148xfs_inode_fork_size(
149	struct xfs_inode	*ip,
150	int			whichfork)
151{
152	switch (whichfork) {
153	case XFS_DATA_FORK:
154		return xfs_inode_data_fork_size(ip);
155	case XFS_ATTR_FORK:
156		return xfs_inode_attr_fork_size(ip);
157	default:
158		return 0;
159	}
160}
161
162/* Convert from vfs inode to xfs inode */
163static inline struct xfs_inode *XFS_I(struct inode *inode)
164{
165	return container_of(inode, struct xfs_inode, i_vnode);
166}
167
168/* convert from xfs inode to vfs inode */
169static inline struct inode *VFS_I(struct xfs_inode *ip)
170{
171	return &ip->i_vnode;
172}
173
174/* convert from const xfs inode to const vfs inode */
175static inline const struct inode *VFS_IC(const struct xfs_inode *ip)
176{
177	return &ip->i_vnode;
178}
179
180/*
181 * For regular files we only update the on-disk filesize when actually
182 * writing data back to disk.  Until then only the copy in the VFS inode
183 * is uptodate.
184 */
185static inline xfs_fsize_t XFS_ISIZE(struct xfs_inode *ip)
186{
187	if (S_ISREG(VFS_I(ip)->i_mode))
188		return i_size_read(VFS_I(ip));
189	return ip->i_disk_size;
190}
191
192/*
193 * If this I/O goes past the on-disk inode size update it unless it would
194 * be past the current in-core inode size.
195 */
196static inline xfs_fsize_t
197xfs_new_eof(struct xfs_inode *ip, xfs_fsize_t new_size)
198{
199	xfs_fsize_t i_size = i_size_read(VFS_I(ip));
200
201	if (new_size > i_size || new_size < 0)
202		new_size = i_size;
203	return new_size > ip->i_disk_size ? new_size : 0;
204}
205
206/*
207 * i_flags helper functions
208 */
209static inline void
210__xfs_iflags_set(xfs_inode_t *ip, unsigned short flags)
211{
212	ip->i_flags |= flags;
213}
214
215static inline void
216xfs_iflags_set(xfs_inode_t *ip, unsigned short flags)
217{
218	spin_lock(&ip->i_flags_lock);
219	__xfs_iflags_set(ip, flags);
220	spin_unlock(&ip->i_flags_lock);
221}
222
223static inline void
224xfs_iflags_clear(xfs_inode_t *ip, unsigned short flags)
225{
226	spin_lock(&ip->i_flags_lock);
227	ip->i_flags &= ~flags;
228	spin_unlock(&ip->i_flags_lock);
229}
230
231static inline int
232__xfs_iflags_test(xfs_inode_t *ip, unsigned short flags)
233{
234	return (ip->i_flags & flags);
235}
236
237static inline int
238xfs_iflags_test(xfs_inode_t *ip, unsigned short flags)
239{
240	int ret;
241	spin_lock(&ip->i_flags_lock);
242	ret = __xfs_iflags_test(ip, flags);
243	spin_unlock(&ip->i_flags_lock);
244	return ret;
245}
246
247static inline int
248xfs_iflags_test_and_clear(xfs_inode_t *ip, unsigned short flags)
249{
250	int ret;
251
252	spin_lock(&ip->i_flags_lock);
253	ret = ip->i_flags & flags;
254	if (ret)
255		ip->i_flags &= ~flags;
256	spin_unlock(&ip->i_flags_lock);
257	return ret;
258}
259
260static inline int
261xfs_iflags_test_and_set(xfs_inode_t *ip, unsigned short flags)
262{
263	int ret;
264
265	spin_lock(&ip->i_flags_lock);
266	ret = ip->i_flags & flags;
267	if (!ret)
268		ip->i_flags |= flags;
269	spin_unlock(&ip->i_flags_lock);
270	return ret;
271}
272
273static inline prid_t
274xfs_get_initial_prid(struct xfs_inode *dp)
275{
276	if (dp->i_diflags & XFS_DIFLAG_PROJINHERIT)
277		return dp->i_projid;
278
279	return XFS_PROJID_DEFAULT;
280}
281
282static inline bool xfs_is_reflink_inode(struct xfs_inode *ip)
283{
284	return ip->i_diflags2 & XFS_DIFLAG2_REFLINK;
285}
286
287static inline bool xfs_is_metadata_inode(struct xfs_inode *ip)
288{
289	struct xfs_mount	*mp = ip->i_mount;
290
291	return ip == mp->m_rbmip || ip == mp->m_rsumip ||
292		xfs_is_quota_inode(&mp->m_sb, ip->i_ino);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
293}
294
295/*
296 * Check if an inode has any data in the COW fork.  This might be often false
297 * even for inodes with the reflink flag when there is no pending COW operation.
298 */
299static inline bool xfs_inode_has_cow_data(struct xfs_inode *ip)
300{
301	return ip->i_cowfp && ip->i_cowfp->if_bytes;
302}
303
304static inline bool xfs_inode_has_bigtime(struct xfs_inode *ip)
305{
306	return ip->i_diflags2 & XFS_DIFLAG2_BIGTIME;
307}
308
309static inline bool xfs_inode_has_large_extent_counts(struct xfs_inode *ip)
310{
311	return ip->i_diflags2 & XFS_DIFLAG2_NREXT64;
312}
313
314/*
 
 
 
 
 
 
 
 
 
315 * Return the buftarg used for data allocations on a given inode.
316 */
317#define xfs_inode_buftarg(ip) \
318	(XFS_IS_REALTIME_INODE(ip) ? \
319		(ip)->i_mount->m_rtdev_targp : (ip)->i_mount->m_ddev_targp)
320
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
321/*
322 * In-core inode flags.
323 */
324#define XFS_IRECLAIM		(1 << 0) /* started reclaiming this inode */
325#define XFS_ISTALE		(1 << 1) /* inode has been staled */
326#define XFS_IRECLAIMABLE	(1 << 2) /* inode can be reclaimed */
327#define XFS_INEW		(1 << 3) /* inode has just been allocated */
328#define XFS_IPRESERVE_DM_FIELDS	(1 << 4) /* has legacy DMAPI fields set */
329#define XFS_ITRUNCATED		(1 << 5) /* truncated down so flush-on-close */
330#define XFS_IDIRTY_RELEASE	(1 << 6) /* dirty release already seen */
331#define XFS_IFLUSHING		(1 << 7) /* inode is being flushed */
332#define __XFS_IPINNED_BIT	8	 /* wakeup key for zero pin count */
333#define XFS_IPINNED		(1 << __XFS_IPINNED_BIT)
334#define XFS_IEOFBLOCKS		(1 << 9) /* has the preallocblocks tag set */
335#define XFS_NEED_INACTIVE	(1 << 10) /* see XFS_INACTIVATING below */
336/*
337 * If this unlinked inode is in the middle of recovery, don't let drop_inode
338 * truncate and free the inode.  This can happen if we iget the inode during
339 * log recovery to replay a bmap operation on the inode.
340 */
341#define XFS_IRECOVERY		(1 << 11)
342#define XFS_ICOWBLOCKS		(1 << 12)/* has the cowblocks tag set */
343
344/*
345 * If we need to update on-disk metadata before this IRECLAIMABLE inode can be
346 * freed, then NEED_INACTIVE will be set.  Once we start the updates, the
347 * INACTIVATING bit will be set to keep iget away from this inode.  After the
348 * inactivation completes, both flags will be cleared and the inode is a
349 * plain old IRECLAIMABLE inode.
350 */
351#define XFS_INACTIVATING	(1 << 13)
352
353/* Quotacheck is running but inode has not been added to quota counts. */
354#define XFS_IQUOTAUNCHECKED	(1 << 14)
355
356/*
357 * Remap in progress. Callers that wish to update file data while
358 * holding a shared IOLOCK or MMAPLOCK must drop the lock and retake
359 * the lock in exclusive mode. Relocking the file will block until
360 * IREMAPPING is cleared.
361 */
362#define XFS_IREMAPPING		(1U << 15)
363
364/* All inode state flags related to inode reclaim. */
365#define XFS_ALL_IRECLAIM_FLAGS	(XFS_IRECLAIMABLE | \
366				 XFS_IRECLAIM | \
367				 XFS_NEED_INACTIVE | \
368				 XFS_INACTIVATING)
369
370/*
371 * Per-lifetime flags need to be reset when re-using a reclaimable inode during
372 * inode lookup. This prevents unintended behaviour on the new inode from
373 * ocurring.
374 */
375#define XFS_IRECLAIM_RESET_FLAGS	\
376	(XFS_IRECLAIMABLE | XFS_IRECLAIM | \
377	 XFS_IDIRTY_RELEASE | XFS_ITRUNCATED | XFS_NEED_INACTIVE | \
378	 XFS_INACTIVATING | XFS_IQUOTAUNCHECKED)
379
380/*
381 * Flags for inode locking.
382 * Bit ranges:	1<<1  - 1<<16-1 -- iolock/ilock modes (bitfield)
383 *		1<<16 - 1<<32-1 -- lockdep annotation (integers)
384 */
385#define	XFS_IOLOCK_EXCL		(1u << 0)
386#define	XFS_IOLOCK_SHARED	(1u << 1)
387#define	XFS_ILOCK_EXCL		(1u << 2)
388#define	XFS_ILOCK_SHARED	(1u << 3)
389#define	XFS_MMAPLOCK_EXCL	(1u << 4)
390#define	XFS_MMAPLOCK_SHARED	(1u << 5)
391
392#define XFS_LOCK_MASK		(XFS_IOLOCK_EXCL | XFS_IOLOCK_SHARED \
393				| XFS_ILOCK_EXCL | XFS_ILOCK_SHARED \
394				| XFS_MMAPLOCK_EXCL | XFS_MMAPLOCK_SHARED)
395
396#define XFS_LOCK_FLAGS \
397	{ XFS_IOLOCK_EXCL,	"IOLOCK_EXCL" }, \
398	{ XFS_IOLOCK_SHARED,	"IOLOCK_SHARED" }, \
399	{ XFS_ILOCK_EXCL,	"ILOCK_EXCL" }, \
400	{ XFS_ILOCK_SHARED,	"ILOCK_SHARED" }, \
401	{ XFS_MMAPLOCK_EXCL,	"MMAPLOCK_EXCL" }, \
402	{ XFS_MMAPLOCK_SHARED,	"MMAPLOCK_SHARED" }
403
404
405/*
406 * Flags for lockdep annotations.
407 *
408 * XFS_LOCK_PARENT - for directory operations that require locking a
409 * parent directory inode and a child entry inode. IOLOCK requires nesting,
410 * MMAPLOCK does not support this class, ILOCK requires a single subclass
411 * to differentiate parent from child.
412 *
413 * XFS_LOCK_RTBITMAP/XFS_LOCK_RTSUM - the realtime device bitmap and summary
414 * inodes do not participate in the normal lock order, and thus have their
415 * own subclasses.
416 *
417 * XFS_LOCK_INUMORDER - for locking several inodes at the some time
418 * with xfs_lock_inodes().  This flag is used as the starting subclass
419 * and each subsequent lock acquired will increment the subclass by one.
420 * However, MAX_LOCKDEP_SUBCLASSES == 8, which means we are greatly
421 * limited to the subclasses we can represent via nesting. We need at least
422 * 5 inodes nest depth for the ILOCK through rename, and we also have to support
423 * XFS_ILOCK_PARENT, which gives 6 subclasses. Then we have XFS_ILOCK_RTBITMAP
424 * and XFS_ILOCK_RTSUM, which are another 2 unique subclasses, so that's all
425 * 8 subclasses supported by lockdep.
426 *
427 * This also means we have to number the sub-classes in the lowest bits of
428 * the mask we keep, and we have to ensure we never exceed 3 bits of lockdep
429 * mask and we can't use bit-masking to build the subclasses. What a mess.
430 *
431 * Bit layout:
432 *
433 * Bit		Lock Region
434 * 16-19	XFS_IOLOCK_SHIFT dependencies
435 * 20-23	XFS_MMAPLOCK_SHIFT dependencies
436 * 24-31	XFS_ILOCK_SHIFT dependencies
437 *
438 * IOLOCK values
439 *
440 * 0-3		subclass value
441 * 4-7		unused
442 *
443 * MMAPLOCK values
444 *
445 * 0-3		subclass value
446 * 4-7		unused
447 *
448 * ILOCK values
449 * 0-4		subclass values
450 * 5		PARENT subclass (not nestable)
451 * 6		RTBITMAP subclass (not nestable)
452 * 7		RTSUM subclass (not nestable)
453 * 
454 */
455#define XFS_IOLOCK_SHIFT		16
456#define XFS_IOLOCK_MAX_SUBCLASS		3
457#define XFS_IOLOCK_DEP_MASK		0x000f0000u
458
459#define XFS_MMAPLOCK_SHIFT		20
460#define XFS_MMAPLOCK_NUMORDER		0
461#define XFS_MMAPLOCK_MAX_SUBCLASS	3
462#define XFS_MMAPLOCK_DEP_MASK		0x00f00000u
463
464#define XFS_ILOCK_SHIFT			24
465#define XFS_ILOCK_PARENT_VAL		5u
466#define XFS_ILOCK_MAX_SUBCLASS		(XFS_ILOCK_PARENT_VAL - 1)
467#define XFS_ILOCK_RTBITMAP_VAL		6u
468#define XFS_ILOCK_RTSUM_VAL		7u
469#define XFS_ILOCK_DEP_MASK		0xff000000u
470#define	XFS_ILOCK_PARENT		(XFS_ILOCK_PARENT_VAL << XFS_ILOCK_SHIFT)
471#define	XFS_ILOCK_RTBITMAP		(XFS_ILOCK_RTBITMAP_VAL << XFS_ILOCK_SHIFT)
472#define	XFS_ILOCK_RTSUM			(XFS_ILOCK_RTSUM_VAL << XFS_ILOCK_SHIFT)
473
474#define XFS_LOCK_SUBCLASS_MASK	(XFS_IOLOCK_DEP_MASK | \
475				 XFS_MMAPLOCK_DEP_MASK | \
476				 XFS_ILOCK_DEP_MASK)
477
478#define XFS_IOLOCK_DEP(flags)	(((flags) & XFS_IOLOCK_DEP_MASK) \
479					>> XFS_IOLOCK_SHIFT)
480#define XFS_MMAPLOCK_DEP(flags)	(((flags) & XFS_MMAPLOCK_DEP_MASK) \
481					>> XFS_MMAPLOCK_SHIFT)
482#define XFS_ILOCK_DEP(flags)	(((flags) & XFS_ILOCK_DEP_MASK) \
483					>> XFS_ILOCK_SHIFT)
484
485/*
486 * Layouts are broken in the BREAK_WRITE case to ensure that
487 * layout-holders do not collide with local writes. Additionally,
488 * layouts are broken in the BREAK_UNMAP case to make sure the
489 * layout-holder has a consistent view of the file's extent map. While
490 * BREAK_WRITE breaks can be satisfied by recalling FL_LAYOUT leases,
491 * BREAK_UNMAP breaks additionally require waiting for busy dax-pages to
492 * go idle.
493 */
494enum layout_break_reason {
495        BREAK_WRITE,
496        BREAK_UNMAP,
497};
498
499/*
500 * For multiple groups support: if S_ISGID bit is set in the parent
501 * directory, group of new file is set to that of the parent, and
502 * new subdirectory gets S_ISGID bit from parent.
503 */
504#define XFS_INHERIT_GID(pip)	\
505	(xfs_has_grpid((pip)->i_mount) || (VFS_I(pip)->i_mode & S_ISGID))
506
507int		xfs_release(struct xfs_inode *ip);
508int		xfs_inactive(struct xfs_inode *ip);
509int		xfs_lookup(struct xfs_inode *dp, const struct xfs_name *name,
510			   struct xfs_inode **ipp, struct xfs_name *ci_name);
511int		xfs_create(struct mnt_idmap *idmap,
512			   struct xfs_inode *dp, struct xfs_name *name,
513			   umode_t mode, dev_t rdev, bool need_xattr,
514			   struct xfs_inode **ipp);
515int		xfs_create_tmpfile(struct mnt_idmap *idmap,
516			   struct xfs_inode *dp, umode_t mode,
517			   struct xfs_inode **ipp);
518int		xfs_remove(struct xfs_inode *dp, struct xfs_name *name,
519			   struct xfs_inode *ip);
520int		xfs_link(struct xfs_inode *tdp, struct xfs_inode *sip,
521			 struct xfs_name *target_name);
522int		xfs_rename(struct mnt_idmap *idmap,
523			   struct xfs_inode *src_dp, struct xfs_name *src_name,
524			   struct xfs_inode *src_ip, struct xfs_inode *target_dp,
525			   struct xfs_name *target_name,
526			   struct xfs_inode *target_ip, unsigned int flags);
527
528void		xfs_ilock(xfs_inode_t *, uint);
529int		xfs_ilock_nowait(xfs_inode_t *, uint);
530void		xfs_iunlock(xfs_inode_t *, uint);
531void		xfs_ilock_demote(xfs_inode_t *, uint);
532void		xfs_assert_ilocked(struct xfs_inode *, uint);
533uint		xfs_ilock_data_map_shared(struct xfs_inode *);
534uint		xfs_ilock_attr_map_shared(struct xfs_inode *);
535
536uint		xfs_ip2xflags(struct xfs_inode *);
537int		xfs_ifree(struct xfs_trans *, struct xfs_inode *);
538int		xfs_itruncate_extents_flags(struct xfs_trans **,
539				struct xfs_inode *, int, xfs_fsize_t, int);
540void		xfs_iext_realloc(xfs_inode_t *, int, int);
541
542int		xfs_log_force_inode(struct xfs_inode *ip);
543void		xfs_iunpin_wait(xfs_inode_t *);
544#define xfs_ipincount(ip)	((unsigned int) atomic_read(&ip->i_pincount))
545
546int		xfs_iflush_cluster(struct xfs_buf *);
547void		xfs_lock_two_inodes(struct xfs_inode *ip0, uint ip0_mode,
548				struct xfs_inode *ip1, uint ip1_mode);
549
550xfs_extlen_t	xfs_get_extsz_hint(struct xfs_inode *ip);
551xfs_extlen_t	xfs_get_cowextsz_hint(struct xfs_inode *ip);
552
553int xfs_init_new_inode(struct mnt_idmap *idmap, struct xfs_trans *tp,
554		struct xfs_inode *pip, xfs_ino_t ino, umode_t mode,
555		xfs_nlink_t nlink, dev_t rdev, prid_t prid, bool init_xattrs,
556		struct xfs_inode **ipp);
557
558static inline int
559xfs_itruncate_extents(
560	struct xfs_trans	**tpp,
561	struct xfs_inode	*ip,
562	int			whichfork,
563	xfs_fsize_t		new_size)
564{
565	return xfs_itruncate_extents_flags(tpp, ip, whichfork, new_size, 0);
566}
567
568/* from xfs_file.c */
569int	xfs_break_dax_layouts(struct inode *inode, bool *retry);
570int	xfs_break_layouts(struct inode *inode, uint *iolock,
571		enum layout_break_reason reason);
572
573/* from xfs_iops.c */
574extern void xfs_setup_inode(struct xfs_inode *ip);
575extern void xfs_setup_iops(struct xfs_inode *ip);
576extern void xfs_diflags_to_iflags(struct xfs_inode *ip, bool init);
577
578static inline void xfs_update_stable_writes(struct xfs_inode *ip)
579{
580	if (bdev_stable_writes(xfs_inode_buftarg(ip)->bt_bdev))
581		mapping_set_stable_writes(VFS_I(ip)->i_mapping);
582	else
583		mapping_clear_stable_writes(VFS_I(ip)->i_mapping);
584}
585
586/*
587 * When setting up a newly allocated inode, we need to call
588 * xfs_finish_inode_setup() once the inode is fully instantiated at
589 * the VFS level to prevent the rest of the world seeing the inode
590 * before we've completed instantiation. Otherwise we can do it
591 * the moment the inode lookup is complete.
592 */
593static inline void xfs_finish_inode_setup(struct xfs_inode *ip)
594{
595	xfs_iflags_clear(ip, XFS_INEW);
596	barrier();
597	unlock_new_inode(VFS_I(ip));
598}
599
600static inline void xfs_setup_existing_inode(struct xfs_inode *ip)
601{
602	xfs_setup_inode(ip);
603	xfs_setup_iops(ip);
604	xfs_finish_inode_setup(ip);
605}
606
607void xfs_irele(struct xfs_inode *ip);
608
609extern struct kmem_cache	*xfs_inode_cache;
610
611/* The default CoW extent size hint. */
612#define XFS_DEFAULT_COWEXTSZ_HINT 32
613
614bool xfs_inode_needs_inactive(struct xfs_inode *ip);
615
 
 
 
 
616void xfs_end_io(struct work_struct *work);
617
618int xfs_ilock2_io_mmap(struct xfs_inode *ip1, struct xfs_inode *ip2);
619void xfs_iunlock2_io_mmap(struct xfs_inode *ip1, struct xfs_inode *ip2);
620void xfs_iunlock2_remapping(struct xfs_inode *ip1, struct xfs_inode *ip2);
 
 
621
622static inline bool
623xfs_inode_unlinked_incomplete(
624	struct xfs_inode	*ip)
625{
626	return VFS_I(ip)->i_nlink == 0 && !xfs_inode_on_unlinked_list(ip);
627}
628int xfs_inode_reload_unlinked_bucket(struct xfs_trans *tp, struct xfs_inode *ip);
629int xfs_inode_reload_unlinked(struct xfs_inode *ip);
630
631bool xfs_ifork_zapped(const struct xfs_inode *ip, int whichfork);
632void xfs_inode_count_blocks(struct xfs_trans *tp, struct xfs_inode *ip,
633		xfs_filblks_t *dblocks, xfs_filblks_t *rblocks);
 
634
635struct xfs_dir_update_params {
636	const struct xfs_inode	*dp;
637	const struct xfs_inode	*ip;
638	const struct xfs_name	*name;
639	int			delta;
640};
641
642#ifdef CONFIG_XFS_LIVE_HOOKS
643void xfs_dir_update_hook(struct xfs_inode *dp, struct xfs_inode *ip,
644		int delta, const struct xfs_name *name);
645
646struct xfs_dir_hook {
647	struct xfs_hook		dirent_hook;
648};
649
650void xfs_dir_hook_disable(void);
651void xfs_dir_hook_enable(void);
652
653int xfs_dir_hook_add(struct xfs_mount *mp, struct xfs_dir_hook *hook);
654void xfs_dir_hook_del(struct xfs_mount *mp, struct xfs_dir_hook *hook);
655void xfs_dir_hook_setup(struct xfs_dir_hook *hook, notifier_fn_t mod_fn);
656#else
657# define xfs_dir_update_hook(dp, ip, delta, name)	((void)0)
658#endif /* CONFIG_XFS_LIVE_HOOKS */
659
660#endif	/* __XFS_INODE_H__ */
v6.13.7
  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
  4 * All Rights Reserved.
  5 */
  6#ifndef	__XFS_INODE_H__
  7#define	__XFS_INODE_H__
  8
  9#include "xfs_inode_buf.h"
 10#include "xfs_inode_fork.h"
 11#include "xfs_inode_util.h"
 12
 13/*
 14 * Kernel only inode definitions
 15 */
 16struct xfs_dinode;
 17struct xfs_inode;
 18struct xfs_buf;
 19struct xfs_bmbt_irec;
 20struct xfs_inode_log_item;
 21struct xfs_mount;
 22struct xfs_trans;
 23struct xfs_dquot;
 24
 25typedef struct xfs_inode {
 26	/* Inode linking and identification information. */
 27	struct xfs_mount	*i_mount;	/* fs mount struct ptr */
 28	struct xfs_dquot	*i_udquot;	/* user dquot */
 29	struct xfs_dquot	*i_gdquot;	/* group dquot */
 30	struct xfs_dquot	*i_pdquot;	/* project dquot */
 31
 32	/* Inode location stuff */
 33	xfs_ino_t		i_ino;		/* inode number (agno/agino)*/
 34	struct xfs_imap		i_imap;		/* location for xfs_imap() */
 35
 36	/* Extent information. */
 37	struct xfs_ifork	*i_cowfp;	/* copy on write extents */
 38	struct xfs_ifork	i_df;		/* data fork */
 39	struct xfs_ifork	i_af;		/* attribute fork */
 40
 41	/* Transaction and locking information. */
 42	struct xfs_inode_log_item *i_itemp;	/* logging information */
 43	struct rw_semaphore	i_lock;		/* inode lock */
 44	atomic_t		i_pincount;	/* inode pin count */
 45	struct llist_node	i_gclist;	/* deferred inactivation list */
 46
 47	/*
 48	 * Bitsets of inode metadata that have been checked and/or are sick.
 49	 * Callers must hold i_flags_lock before accessing this field.
 50	 */
 51	uint16_t		i_checked;
 52	uint16_t		i_sick;
 53
 54	spinlock_t		i_flags_lock;	/* inode i_flags lock */
 55	/* Miscellaneous state. */
 56	unsigned long		i_flags;	/* see defined flags below */
 57	uint64_t		i_delayed_blks;	/* count of delay alloc blks */
 58	xfs_fsize_t		i_disk_size;	/* number of bytes in file */
 59	xfs_rfsblock_t		i_nblocks;	/* # of direct & btree blocks */
 60	prid_t			i_projid;	/* owner's project id */
 61	xfs_extlen_t		i_extsize;	/* basic/minimum extent size */
 62	/* cowextsize is only used for v3 inodes, flushiter for v1/2 */
 63	union {
 64		xfs_extlen_t	i_cowextsize;	/* basic cow extent size */
 65		uint16_t	i_flushiter;	/* incremented on flush */
 66	};
 67	uint8_t			i_forkoff;	/* attr fork offset >> 3 */
 68	enum xfs_metafile_type	i_metatype;	/* XFS_METAFILE_* */
 69	uint16_t		i_diflags;	/* XFS_DIFLAG_... */
 70	uint64_t		i_diflags2;	/* XFS_DIFLAG2_... */
 71	struct timespec64	i_crtime;	/* time created */
 72
 73	/*
 74	 * Unlinked list pointers.  These point to the next and previous inodes
 75	 * in the AGI unlinked bucket list, respectively.  These fields can
 76	 * only be updated with the AGI locked.
 77	 *
 78	 * i_next_unlinked caches di_next_unlinked.
 79	 */
 80	xfs_agino_t		i_next_unlinked;
 81
 82	/*
 83	 * If the inode is not on an unlinked list, this field is zero.  If the
 84	 * inode is the first element in an unlinked list, this field is
 85	 * NULLAGINO.  Otherwise, i_prev_unlinked points to the previous inode
 86	 * in the unlinked list.
 87	 */
 88	xfs_agino_t		i_prev_unlinked;
 89
 90	/* VFS inode */
 91	struct inode		i_vnode;	/* embedded VFS inode */
 92
 93	/* pending io completions */
 94	spinlock_t		i_ioend_lock;
 95	struct work_struct	i_ioend_work;
 96	struct list_head	i_ioend_list;
 97} xfs_inode_t;
 98
 99static inline bool xfs_inode_on_unlinked_list(const struct xfs_inode *ip)
100{
101	return ip->i_prev_unlinked != 0;
102}
103
104static inline bool xfs_inode_has_attr_fork(const struct xfs_inode *ip)
105{
106	return ip->i_forkoff > 0;
107}
108
109static inline struct xfs_ifork *
110xfs_ifork_ptr(
111	struct xfs_inode	*ip,
112	int			whichfork)
113{
114	switch (whichfork) {
115	case XFS_DATA_FORK:
116		return &ip->i_df;
117	case XFS_ATTR_FORK:
118		if (!xfs_inode_has_attr_fork(ip))
119			return NULL;
120		return &ip->i_af;
121	case XFS_COW_FORK:
122		return ip->i_cowfp;
123	default:
124		ASSERT(0);
125		return NULL;
126	}
127}
128
129static inline unsigned int xfs_inode_fork_boff(struct xfs_inode *ip)
130{
131	return ip->i_forkoff << 3;
132}
133
134static inline unsigned int xfs_inode_data_fork_size(struct xfs_inode *ip)
135{
136	if (xfs_inode_has_attr_fork(ip))
137		return xfs_inode_fork_boff(ip);
138
139	return XFS_LITINO(ip->i_mount);
140}
141
142static inline unsigned int xfs_inode_attr_fork_size(struct xfs_inode *ip)
143{
144	if (xfs_inode_has_attr_fork(ip))
145		return XFS_LITINO(ip->i_mount) - xfs_inode_fork_boff(ip);
146	return 0;
147}
148
149static inline unsigned int
150xfs_inode_fork_size(
151	struct xfs_inode	*ip,
152	int			whichfork)
153{
154	switch (whichfork) {
155	case XFS_DATA_FORK:
156		return xfs_inode_data_fork_size(ip);
157	case XFS_ATTR_FORK:
158		return xfs_inode_attr_fork_size(ip);
159	default:
160		return 0;
161	}
162}
163
164/* Convert from vfs inode to xfs inode */
165static inline struct xfs_inode *XFS_I(struct inode *inode)
166{
167	return container_of(inode, struct xfs_inode, i_vnode);
168}
169
170/* convert from xfs inode to vfs inode */
171static inline struct inode *VFS_I(struct xfs_inode *ip)
172{
173	return &ip->i_vnode;
174}
175
176/* convert from const xfs inode to const vfs inode */
177static inline const struct inode *VFS_IC(const struct xfs_inode *ip)
178{
179	return &ip->i_vnode;
180}
181
182/*
183 * For regular files we only update the on-disk filesize when actually
184 * writing data back to disk.  Until then only the copy in the VFS inode
185 * is uptodate.
186 */
187static inline xfs_fsize_t XFS_ISIZE(struct xfs_inode *ip)
188{
189	if (S_ISREG(VFS_I(ip)->i_mode))
190		return i_size_read(VFS_I(ip));
191	return ip->i_disk_size;
192}
193
194/*
195 * If this I/O goes past the on-disk inode size update it unless it would
196 * be past the current in-core inode size.
197 */
198static inline xfs_fsize_t
199xfs_new_eof(struct xfs_inode *ip, xfs_fsize_t new_size)
200{
201	xfs_fsize_t i_size = i_size_read(VFS_I(ip));
202
203	if (new_size > i_size || new_size < 0)
204		new_size = i_size;
205	return new_size > ip->i_disk_size ? new_size : 0;
206}
207
208/*
209 * i_flags helper functions
210 */
211static inline void
212__xfs_iflags_set(xfs_inode_t *ip, unsigned long flags)
213{
214	ip->i_flags |= flags;
215}
216
217static inline void
218xfs_iflags_set(xfs_inode_t *ip, unsigned long flags)
219{
220	spin_lock(&ip->i_flags_lock);
221	__xfs_iflags_set(ip, flags);
222	spin_unlock(&ip->i_flags_lock);
223}
224
225static inline void
226xfs_iflags_clear(xfs_inode_t *ip, unsigned long flags)
227{
228	spin_lock(&ip->i_flags_lock);
229	ip->i_flags &= ~flags;
230	spin_unlock(&ip->i_flags_lock);
231}
232
233static inline int
234__xfs_iflags_test(const struct xfs_inode *ip, unsigned long flags)
235{
236	return (ip->i_flags & flags);
237}
238
239static inline int
240xfs_iflags_test(xfs_inode_t *ip, unsigned long flags)
241{
242	int ret;
243	spin_lock(&ip->i_flags_lock);
244	ret = __xfs_iflags_test(ip, flags);
245	spin_unlock(&ip->i_flags_lock);
246	return ret;
247}
248
249static inline int
250xfs_iflags_test_and_clear(xfs_inode_t *ip, unsigned long flags)
251{
252	int ret;
253
254	spin_lock(&ip->i_flags_lock);
255	ret = ip->i_flags & flags;
256	if (ret)
257		ip->i_flags &= ~flags;
258	spin_unlock(&ip->i_flags_lock);
259	return ret;
260}
261
262static inline int
263xfs_iflags_test_and_set(xfs_inode_t *ip, unsigned long flags)
264{
265	int ret;
266
267	spin_lock(&ip->i_flags_lock);
268	ret = ip->i_flags & flags;
269	if (!ret)
270		ip->i_flags |= flags;
271	spin_unlock(&ip->i_flags_lock);
272	return ret;
273}
274
275static inline bool xfs_is_reflink_inode(const struct xfs_inode *ip)
 
276{
277	return ip->i_diflags2 & XFS_DIFLAG2_REFLINK;
 
 
 
278}
279
280static inline bool xfs_is_metadir_inode(const struct xfs_inode *ip)
281{
282	return ip->i_diflags2 & XFS_DIFLAG2_METADATA;
283}
284
285static inline bool xfs_is_internal_inode(const struct xfs_inode *ip)
286{
287	struct xfs_mount	*mp = ip->i_mount;
288
289	/* Any file in the metadata directory tree is a metadata inode. */
290	if (xfs_has_metadir(mp))
291		return xfs_is_metadir_inode(ip);
292
293	/*
294	 * Before metadata directories, the only metadata inodes were the
295	 * three quota files, the realtime bitmap, and the realtime summary.
296	 */
297	return ip->i_ino == mp->m_sb.sb_rbmino ||
298	       ip->i_ino == mp->m_sb.sb_rsumino ||
299	       xfs_is_quota_inode(&mp->m_sb, ip->i_ino);
300}
301
302bool xfs_is_always_cow_inode(const struct xfs_inode *ip);
303
304static inline bool xfs_is_cow_inode(const struct xfs_inode *ip)
305{
306	return xfs_is_reflink_inode(ip) || xfs_is_always_cow_inode(ip);
307}
308
309static inline bool xfs_inode_has_filedata(const struct xfs_inode *ip)
310{
311	return ip->i_df.if_nextents > 0 || ip->i_delayed_blks > 0;
312}
313
314/*
315 * Check if an inode has any data in the COW fork.  This might be often false
316 * even for inodes with the reflink flag when there is no pending COW operation.
317 */
318static inline bool xfs_inode_has_cow_data(const struct xfs_inode *ip)
319{
320	return ip->i_cowfp && ip->i_cowfp->if_bytes;
321}
322
323static inline bool xfs_inode_has_bigtime(const struct xfs_inode *ip)
324{
325	return ip->i_diflags2 & XFS_DIFLAG2_BIGTIME;
326}
327
328static inline bool xfs_inode_has_large_extent_counts(const struct xfs_inode *ip)
329{
330	return ip->i_diflags2 & XFS_DIFLAG2_NREXT64;
331}
332
333/*
334 * Decide if this file is a realtime file whose data allocation unit is larger
335 * than a single filesystem block.
336 */
337static inline bool xfs_inode_has_bigrtalloc(const struct xfs_inode *ip)
338{
339	return XFS_IS_REALTIME_INODE(ip) && ip->i_mount->m_sb.sb_rextsize > 1;
340}
341
342/*
343 * Return the buftarg used for data allocations on a given inode.
344 */
345#define xfs_inode_buftarg(ip) \
346	(XFS_IS_REALTIME_INODE(ip) ? \
347		(ip)->i_mount->m_rtdev_targp : (ip)->i_mount->m_ddev_targp)
348
349static inline bool
350xfs_inode_can_atomicwrite(
351	struct xfs_inode	*ip)
352{
353	struct xfs_mount	*mp = ip->i_mount;
354	struct xfs_buftarg	*target = xfs_inode_buftarg(ip);
355
356	if (mp->m_sb.sb_blocksize < target->bt_bdev_awu_min)
357		return false;
358	if (mp->m_sb.sb_blocksize > target->bt_bdev_awu_max)
359		return false;
360
361	return true;
362}
363
364/*
365 * In-core inode flags.
366 */
367#define XFS_IRECLAIM		(1 << 0) /* started reclaiming this inode */
368#define XFS_ISTALE		(1 << 1) /* inode has been staled */
369#define XFS_IRECLAIMABLE	(1 << 2) /* inode can be reclaimed */
370#define XFS_INEW		(1 << 3) /* inode has just been allocated */
371#define XFS_IPRESERVE_DM_FIELDS	(1 << 4) /* has legacy DMAPI fields set */
372#define XFS_ITRUNCATED		(1 << 5) /* truncated down so flush-on-close */
373#define XFS_EOFBLOCKS_RELEASED	(1 << 6) /* eofblocks were freed in ->release */
374#define XFS_IFLUSHING		(1 << 7) /* inode is being flushed */
375#define __XFS_IPINNED_BIT	8	 /* wakeup key for zero pin count */
376#define XFS_IPINNED		(1 << __XFS_IPINNED_BIT)
377#define XFS_IEOFBLOCKS		(1 << 9) /* has the preallocblocks tag set */
378#define XFS_NEED_INACTIVE	(1 << 10) /* see XFS_INACTIVATING below */
379/*
380 * If this unlinked inode is in the middle of recovery, don't let drop_inode
381 * truncate and free the inode.  This can happen if we iget the inode during
382 * log recovery to replay a bmap operation on the inode.
383 */
384#define XFS_IRECOVERY		(1 << 11)
385#define XFS_ICOWBLOCKS		(1 << 12)/* has the cowblocks tag set */
386
387/*
388 * If we need to update on-disk metadata before this IRECLAIMABLE inode can be
389 * freed, then NEED_INACTIVE will be set.  Once we start the updates, the
390 * INACTIVATING bit will be set to keep iget away from this inode.  After the
391 * inactivation completes, both flags will be cleared and the inode is a
392 * plain old IRECLAIMABLE inode.
393 */
394#define XFS_INACTIVATING	(1 << 13)
395
396/* Quotacheck is running but inode has not been added to quota counts. */
397#define XFS_IQUOTAUNCHECKED	(1 << 14)
398
399/*
400 * Remap in progress. Callers that wish to update file data while
401 * holding a shared IOLOCK or MMAPLOCK must drop the lock and retake
402 * the lock in exclusive mode. Relocking the file will block until
403 * IREMAPPING is cleared.
404 */
405#define XFS_IREMAPPING		(1U << 15)
406
407/* All inode state flags related to inode reclaim. */
408#define XFS_ALL_IRECLAIM_FLAGS	(XFS_IRECLAIMABLE | \
409				 XFS_IRECLAIM | \
410				 XFS_NEED_INACTIVE | \
411				 XFS_INACTIVATING)
412
413/*
414 * Per-lifetime flags need to be reset when re-using a reclaimable inode during
415 * inode lookup. This prevents unintended behaviour on the new inode from
416 * ocurring.
417 */
418#define XFS_IRECLAIM_RESET_FLAGS	\
419	(XFS_IRECLAIMABLE | XFS_IRECLAIM | \
420	 XFS_EOFBLOCKS_RELEASED | XFS_ITRUNCATED | XFS_NEED_INACTIVE | \
421	 XFS_INACTIVATING | XFS_IQUOTAUNCHECKED)
422
423/*
424 * Flags for inode locking.
425 * Bit ranges:	1<<1  - 1<<16-1 -- iolock/ilock modes (bitfield)
426 *		1<<16 - 1<<32-1 -- lockdep annotation (integers)
427 */
428#define	XFS_IOLOCK_EXCL		(1u << 0)
429#define	XFS_IOLOCK_SHARED	(1u << 1)
430#define	XFS_ILOCK_EXCL		(1u << 2)
431#define	XFS_ILOCK_SHARED	(1u << 3)
432#define	XFS_MMAPLOCK_EXCL	(1u << 4)
433#define	XFS_MMAPLOCK_SHARED	(1u << 5)
434
435#define XFS_LOCK_MASK		(XFS_IOLOCK_EXCL | XFS_IOLOCK_SHARED \
436				| XFS_ILOCK_EXCL | XFS_ILOCK_SHARED \
437				| XFS_MMAPLOCK_EXCL | XFS_MMAPLOCK_SHARED)
438
439#define XFS_LOCK_FLAGS \
440	{ XFS_IOLOCK_EXCL,	"IOLOCK_EXCL" }, \
441	{ XFS_IOLOCK_SHARED,	"IOLOCK_SHARED" }, \
442	{ XFS_ILOCK_EXCL,	"ILOCK_EXCL" }, \
443	{ XFS_ILOCK_SHARED,	"ILOCK_SHARED" }, \
444	{ XFS_MMAPLOCK_EXCL,	"MMAPLOCK_EXCL" }, \
445	{ XFS_MMAPLOCK_SHARED,	"MMAPLOCK_SHARED" }
446
447
448/*
449 * Flags for lockdep annotations.
450 *
451 * XFS_LOCK_PARENT - for directory operations that require locking a
452 * parent directory inode and a child entry inode. IOLOCK requires nesting,
453 * MMAPLOCK does not support this class, ILOCK requires a single subclass
454 * to differentiate parent from child.
455 *
456 * XFS_LOCK_RTBITMAP/XFS_LOCK_RTSUM - the realtime device bitmap and summary
457 * inodes do not participate in the normal lock order, and thus have their
458 * own subclasses.
459 *
460 * XFS_LOCK_INUMORDER - for locking several inodes at the some time
461 * with xfs_lock_inodes().  This flag is used as the starting subclass
462 * and each subsequent lock acquired will increment the subclass by one.
463 * However, MAX_LOCKDEP_SUBCLASSES == 8, which means we are greatly
464 * limited to the subclasses we can represent via nesting. We need at least
465 * 5 inodes nest depth for the ILOCK through rename, and we also have to support
466 * XFS_ILOCK_PARENT, which gives 6 subclasses.  That's 6 of the 8 subclasses
467 * supported by lockdep.
 
468 *
469 * This also means we have to number the sub-classes in the lowest bits of
470 * the mask we keep, and we have to ensure we never exceed 3 bits of lockdep
471 * mask and we can't use bit-masking to build the subclasses. What a mess.
472 *
473 * Bit layout:
474 *
475 * Bit		Lock Region
476 * 16-19	XFS_IOLOCK_SHIFT dependencies
477 * 20-23	XFS_MMAPLOCK_SHIFT dependencies
478 * 24-31	XFS_ILOCK_SHIFT dependencies
479 *
480 * IOLOCK values
481 *
482 * 0-3		subclass value
483 * 4-7		unused
484 *
485 * MMAPLOCK values
486 *
487 * 0-3		subclass value
488 * 4-7		unused
489 *
490 * ILOCK values
491 * 0-4		subclass values
492 * 5		PARENT subclass (not nestable)
493 * 6		unused
494 * 7		unused
495 * 
496 */
497#define XFS_IOLOCK_SHIFT		16
498#define XFS_IOLOCK_MAX_SUBCLASS		3
499#define XFS_IOLOCK_DEP_MASK		0x000f0000u
500
501#define XFS_MMAPLOCK_SHIFT		20
502#define XFS_MMAPLOCK_NUMORDER		0
503#define XFS_MMAPLOCK_MAX_SUBCLASS	3
504#define XFS_MMAPLOCK_DEP_MASK		0x00f00000u
505
506#define XFS_ILOCK_SHIFT			24
507#define XFS_ILOCK_PARENT_VAL		5u
508#define XFS_ILOCK_MAX_SUBCLASS		(XFS_ILOCK_PARENT_VAL - 1)
 
 
509#define XFS_ILOCK_DEP_MASK		0xff000000u
510#define	XFS_ILOCK_PARENT		(XFS_ILOCK_PARENT_VAL << XFS_ILOCK_SHIFT)
 
 
511
512#define XFS_LOCK_SUBCLASS_MASK	(XFS_IOLOCK_DEP_MASK | \
513				 XFS_MMAPLOCK_DEP_MASK | \
514				 XFS_ILOCK_DEP_MASK)
515
516#define XFS_IOLOCK_DEP(flags)	(((flags) & XFS_IOLOCK_DEP_MASK) \
517					>> XFS_IOLOCK_SHIFT)
518#define XFS_MMAPLOCK_DEP(flags)	(((flags) & XFS_MMAPLOCK_DEP_MASK) \
519					>> XFS_MMAPLOCK_SHIFT)
520#define XFS_ILOCK_DEP(flags)	(((flags) & XFS_ILOCK_DEP_MASK) \
521					>> XFS_ILOCK_SHIFT)
522
523/*
524 * Layouts are broken in the BREAK_WRITE case to ensure that
525 * layout-holders do not collide with local writes. Additionally,
526 * layouts are broken in the BREAK_UNMAP case to make sure the
527 * layout-holder has a consistent view of the file's extent map. While
528 * BREAK_WRITE breaks can be satisfied by recalling FL_LAYOUT leases,
529 * BREAK_UNMAP breaks additionally require waiting for busy dax-pages to
530 * go idle.
531 */
532enum layout_break_reason {
533        BREAK_WRITE,
534        BREAK_UNMAP,
535};
536
537/*
538 * For multiple groups support: if S_ISGID bit is set in the parent
539 * directory, group of new file is set to that of the parent, and
540 * new subdirectory gets S_ISGID bit from parent.
541 */
542#define XFS_INHERIT_GID(pip)	\
543	(xfs_has_grpid((pip)->i_mount) || (VFS_I(pip)->i_mode & S_ISGID))
544
 
545int		xfs_inactive(struct xfs_inode *ip);
546int		xfs_lookup(struct xfs_inode *dp, const struct xfs_name *name,
547			   struct xfs_inode **ipp, struct xfs_name *ci_name);
548int		xfs_create(const struct xfs_icreate_args *iargs,
549			   struct xfs_name *name, struct xfs_inode **ipp);
550int		xfs_create_tmpfile(const struct xfs_icreate_args *iargs,
 
 
 
551			   struct xfs_inode **ipp);
552int		xfs_remove(struct xfs_inode *dp, struct xfs_name *name,
553			   struct xfs_inode *ip);
554int		xfs_link(struct xfs_inode *tdp, struct xfs_inode *sip,
555			 struct xfs_name *target_name);
556int		xfs_rename(struct mnt_idmap *idmap,
557			   struct xfs_inode *src_dp, struct xfs_name *src_name,
558			   struct xfs_inode *src_ip, struct xfs_inode *target_dp,
559			   struct xfs_name *target_name,
560			   struct xfs_inode *target_ip, unsigned int flags);
561
562void		xfs_ilock(xfs_inode_t *, uint);
563int		xfs_ilock_nowait(xfs_inode_t *, uint);
564void		xfs_iunlock(xfs_inode_t *, uint);
565void		xfs_ilock_demote(xfs_inode_t *, uint);
566void		xfs_assert_ilocked(struct xfs_inode *, uint);
567uint		xfs_ilock_data_map_shared(struct xfs_inode *);
568uint		xfs_ilock_attr_map_shared(struct xfs_inode *);
569
 
570int		xfs_ifree(struct xfs_trans *, struct xfs_inode *);
571int		xfs_itruncate_extents_flags(struct xfs_trans **,
572				struct xfs_inode *, int, xfs_fsize_t, int);
573void		xfs_iext_realloc(xfs_inode_t *, int, int);
574
575int		xfs_log_force_inode(struct xfs_inode *ip);
576void		xfs_iunpin_wait(xfs_inode_t *);
577#define xfs_ipincount(ip)	((unsigned int) atomic_read(&ip->i_pincount))
578
579int		xfs_iflush_cluster(struct xfs_buf *);
580void		xfs_lock_two_inodes(struct xfs_inode *ip0, uint ip0_mode,
581				struct xfs_inode *ip1, uint ip1_mode);
582
583int xfs_icreate(struct xfs_trans *tp, xfs_ino_t ino,
584		const struct xfs_icreate_args *args, struct xfs_inode **ipp);
 
 
 
 
 
585
586static inline int
587xfs_itruncate_extents(
588	struct xfs_trans	**tpp,
589	struct xfs_inode	*ip,
590	int			whichfork,
591	xfs_fsize_t		new_size)
592{
593	return xfs_itruncate_extents_flags(tpp, ip, whichfork, new_size, 0);
594}
595
 
596int	xfs_break_dax_layouts(struct inode *inode, bool *retry);
597int	xfs_break_layouts(struct inode *inode, uint *iolock,
598		enum layout_break_reason reason);
599
 
 
 
 
 
600static inline void xfs_update_stable_writes(struct xfs_inode *ip)
601{
602	if (bdev_stable_writes(xfs_inode_buftarg(ip)->bt_bdev))
603		mapping_set_stable_writes(VFS_I(ip)->i_mapping);
604	else
605		mapping_clear_stable_writes(VFS_I(ip)->i_mapping);
606}
607
608/*
609 * When setting up a newly allocated inode, we need to call
610 * xfs_finish_inode_setup() once the inode is fully instantiated at
611 * the VFS level to prevent the rest of the world seeing the inode
612 * before we've completed instantiation. Otherwise we can do it
613 * the moment the inode lookup is complete.
614 */
615static inline void xfs_finish_inode_setup(struct xfs_inode *ip)
616{
617	xfs_iflags_clear(ip, XFS_INEW);
618	barrier();
619	unlock_new_inode(VFS_I(ip));
620}
621
622static inline void xfs_setup_existing_inode(struct xfs_inode *ip)
623{
624	xfs_setup_inode(ip);
625	xfs_setup_iops(ip);
626	xfs_finish_inode_setup(ip);
627}
628
629void xfs_irele(struct xfs_inode *ip);
630
631extern struct kmem_cache	*xfs_inode_cache;
632
633/* The default CoW extent size hint. */
634#define XFS_DEFAULT_COWEXTSZ_HINT 32
635
636bool xfs_inode_needs_inactive(struct xfs_inode *ip);
637
638struct xfs_inode *xfs_iunlink_lookup(struct xfs_perag *pag, xfs_agino_t agino);
639int xfs_iunlink_reload_next(struct xfs_trans *tp, struct xfs_buf *agibp,
640		xfs_agino_t prev_agino, xfs_agino_t next_agino);
641
642void xfs_end_io(struct work_struct *work);
643
644int xfs_ilock2_io_mmap(struct xfs_inode *ip1, struct xfs_inode *ip2);
645void xfs_iunlock2_io_mmap(struct xfs_inode *ip1, struct xfs_inode *ip2);
646void xfs_iunlock2_remapping(struct xfs_inode *ip1, struct xfs_inode *ip2);
647void xfs_lock_inodes(struct xfs_inode **ips, int inodes, uint lock_mode);
648void xfs_sort_inodes(struct xfs_inode **i_tab, unsigned int num_inodes);
649
650static inline bool
651xfs_inode_unlinked_incomplete(
652	const struct xfs_inode	*ip)
653{
654	return VFS_IC(ip)->i_nlink == 0 && !xfs_inode_on_unlinked_list(ip);
655}
656int xfs_inode_reload_unlinked_bucket(struct xfs_trans *tp, struct xfs_inode *ip);
657int xfs_inode_reload_unlinked(struct xfs_inode *ip);
658
659bool xfs_ifork_zapped(const struct xfs_inode *ip, int whichfork);
660void xfs_inode_count_blocks(struct xfs_trans *tp, struct xfs_inode *ip,
661		xfs_filblks_t *dblocks, xfs_filblks_t *rblocks);
662unsigned int xfs_inode_alloc_unitsize(struct xfs_inode *ip);
663
664int xfs_icreate_dqalloc(const struct xfs_icreate_args *args,
665		struct xfs_dquot **udqpp, struct xfs_dquot **gdqpp,
666		struct xfs_dquot **pdqpp);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
667
668#endif	/* __XFS_INODE_H__ */