1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
6 #ifndef __XFS_INODE_H__
7 #define __XFS_INODE_H__
9 #include "xfs_inode_buf.h"
10 #include "xfs_inode_fork.h"
13 * Kernel only inode definitions
20 struct xfs_inode_log_item;
25 typedef 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 */
32 /* Inode location stuff */
33 xfs_ino_t i_ino; /* inode number (agno/agino)*/
34 struct xfs_imap i_imap; /* location for xfs_imap() */
36 /* Extent information. */
37 xfs_ifork_t *i_afp; /* attribute fork pointer */
38 xfs_ifork_t *i_cowfp; /* copy on write extents */
39 xfs_ifork_t i_df; /* data fork */
41 /* operations vectors */
42 const struct xfs_dir_ops *d_ops; /* directory ops vector */
44 /* Transaction and locking information. */
45 struct xfs_inode_log_item *i_itemp; /* logging information */
46 mrlock_t i_lock; /* inode lock */
47 mrlock_t i_mmaplock; /* inode mmap IO lock */
48 atomic_t i_pincount; /* inode pin count */
49 spinlock_t i_flags_lock; /* inode i_flags lock */
50 /* Miscellaneous state. */
51 unsigned long i_flags; /* see defined flags below */
52 unsigned int i_delayed_blks; /* count of delay alloc blks */
54 struct xfs_icdinode i_d; /* most of ondisk inode */
56 xfs_extnum_t i_cnextents; /* # of extents in cow fork */
57 unsigned int i_cformat; /* format of cow fork */
60 struct inode i_vnode; /* embedded VFS inode */
63 /* Convert from vfs inode to xfs inode */
64 static inline struct xfs_inode *XFS_I(struct inode *inode)
66 return container_of(inode, struct xfs_inode, i_vnode);
69 /* convert from xfs inode to vfs inode */
70 static inline struct inode *VFS_I(struct xfs_inode *ip)
76 * For regular files we only update the on-disk filesize when actually
77 * writing data back to disk. Until then only the copy in the VFS inode
80 static inline xfs_fsize_t XFS_ISIZE(struct xfs_inode *ip)
82 if (S_ISREG(VFS_I(ip)->i_mode))
83 return i_size_read(VFS_I(ip));
84 return ip->i_d.di_size;
88 * If this I/O goes past the on-disk inode size update it unless it would
89 * be past the current in-core inode size.
91 static inline xfs_fsize_t
92 xfs_new_eof(struct xfs_inode *ip, xfs_fsize_t new_size)
94 xfs_fsize_t i_size = i_size_read(VFS_I(ip));
96 if (new_size > i_size || new_size < 0)
98 return new_size > ip->i_d.di_size ? new_size : 0;
102 * i_flags helper functions
105 __xfs_iflags_set(xfs_inode_t *ip, unsigned short flags)
107 ip->i_flags |= flags;
111 xfs_iflags_set(xfs_inode_t *ip, unsigned short flags)
113 spin_lock(&ip->i_flags_lock);
114 __xfs_iflags_set(ip, flags);
115 spin_unlock(&ip->i_flags_lock);
119 xfs_iflags_clear(xfs_inode_t *ip, unsigned short flags)
121 spin_lock(&ip->i_flags_lock);
122 ip->i_flags &= ~flags;
123 spin_unlock(&ip->i_flags_lock);
127 __xfs_iflags_test(xfs_inode_t *ip, unsigned short flags)
129 return (ip->i_flags & flags);
133 xfs_iflags_test(xfs_inode_t *ip, unsigned short flags)
136 spin_lock(&ip->i_flags_lock);
137 ret = __xfs_iflags_test(ip, flags);
138 spin_unlock(&ip->i_flags_lock);
143 xfs_iflags_test_and_clear(xfs_inode_t *ip, unsigned short flags)
147 spin_lock(&ip->i_flags_lock);
148 ret = ip->i_flags & flags;
150 ip->i_flags &= ~flags;
151 spin_unlock(&ip->i_flags_lock);
156 xfs_iflags_test_and_set(xfs_inode_t *ip, unsigned short flags)
160 spin_lock(&ip->i_flags_lock);
161 ret = ip->i_flags & flags;
163 ip->i_flags |= flags;
164 spin_unlock(&ip->i_flags_lock);
169 * Project quota id helpers (previously projid was 16bit only
170 * and using two 16bit values to hold new 32bit projid was chosen
171 * to retain compatibility with "old" filesystems).
174 xfs_get_projid(struct xfs_inode *ip)
176 return (prid_t)ip->i_d.di_projid_hi << 16 | ip->i_d.di_projid_lo;
180 xfs_set_projid(struct xfs_inode *ip,
183 ip->i_d.di_projid_hi = (uint16_t) (projid >> 16);
184 ip->i_d.di_projid_lo = (uint16_t) (projid & 0xffff);
188 xfs_get_initial_prid(struct xfs_inode *dp)
190 if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
191 return xfs_get_projid(dp);
193 return XFS_PROJID_DEFAULT;
196 static inline bool xfs_is_reflink_inode(struct xfs_inode *ip)
198 return ip->i_d.di_flags2 & XFS_DIFLAG2_REFLINK;
202 * In-core inode flags.
204 #define XFS_IRECLAIM (1 << 0) /* started reclaiming this inode */
205 #define XFS_ISTALE (1 << 1) /* inode has been staled */
206 #define XFS_IRECLAIMABLE (1 << 2) /* inode can be reclaimed */
207 #define __XFS_INEW_BIT 3 /* inode has just been allocated */
208 #define XFS_INEW (1 << __XFS_INEW_BIT)
209 #define XFS_ITRUNCATED (1 << 5) /* truncated down so flush-on-close */
210 #define XFS_IDIRTY_RELEASE (1 << 6) /* dirty release already seen */
211 #define __XFS_IFLOCK_BIT 7 /* inode is being flushed right now */
212 #define XFS_IFLOCK (1 << __XFS_IFLOCK_BIT)
213 #define __XFS_IPINNED_BIT 8 /* wakeup key for zero pin count */
214 #define XFS_IPINNED (1 << __XFS_IPINNED_BIT)
215 #define XFS_IDONTCACHE (1 << 9) /* don't cache the inode long term */
216 #define XFS_IEOFBLOCKS (1 << 10)/* has the preallocblocks tag set */
218 * If this unlinked inode is in the middle of recovery, don't let drop_inode
219 * truncate and free the inode. This can happen if we iget the inode during
220 * log recovery to replay a bmap operation on the inode.
222 #define XFS_IRECOVERY (1 << 11)
223 #define XFS_ICOWBLOCKS (1 << 12)/* has the cowblocks tag set */
226 * Per-lifetime flags need to be reset when re-using a reclaimable inode during
227 * inode lookup. This prevents unintended behaviour on the new inode from
230 #define XFS_IRECLAIM_RESET_FLAGS \
231 (XFS_IRECLAIMABLE | XFS_IRECLAIM | \
232 XFS_IDIRTY_RELEASE | XFS_ITRUNCATED)
235 * Synchronize processes attempting to flush the in-core inode back to disk.
238 static inline int xfs_isiflocked(struct xfs_inode *ip)
240 return xfs_iflags_test(ip, XFS_IFLOCK);
243 extern void __xfs_iflock(struct xfs_inode *ip);
245 static inline int xfs_iflock_nowait(struct xfs_inode *ip)
247 return !xfs_iflags_test_and_set(ip, XFS_IFLOCK);
250 static inline void xfs_iflock(struct xfs_inode *ip)
252 if (!xfs_iflock_nowait(ip))
256 static inline void xfs_ifunlock(struct xfs_inode *ip)
258 ASSERT(xfs_isiflocked(ip));
259 xfs_iflags_clear(ip, XFS_IFLOCK);
261 wake_up_bit(&ip->i_flags, __XFS_IFLOCK_BIT);
265 * Flags for inode locking.
266 * Bit ranges: 1<<1 - 1<<16-1 -- iolock/ilock modes (bitfield)
267 * 1<<16 - 1<<32-1 -- lockdep annotation (integers)
269 #define XFS_IOLOCK_EXCL (1<<0)
270 #define XFS_IOLOCK_SHARED (1<<1)
271 #define XFS_ILOCK_EXCL (1<<2)
272 #define XFS_ILOCK_SHARED (1<<3)
273 #define XFS_MMAPLOCK_EXCL (1<<4)
274 #define XFS_MMAPLOCK_SHARED (1<<5)
276 #define XFS_LOCK_MASK (XFS_IOLOCK_EXCL | XFS_IOLOCK_SHARED \
277 | XFS_ILOCK_EXCL | XFS_ILOCK_SHARED \
278 | XFS_MMAPLOCK_EXCL | XFS_MMAPLOCK_SHARED)
280 #define XFS_LOCK_FLAGS \
281 { XFS_IOLOCK_EXCL, "IOLOCK_EXCL" }, \
282 { XFS_IOLOCK_SHARED, "IOLOCK_SHARED" }, \
283 { XFS_ILOCK_EXCL, "ILOCK_EXCL" }, \
284 { XFS_ILOCK_SHARED, "ILOCK_SHARED" }, \
285 { XFS_MMAPLOCK_EXCL, "MMAPLOCK_EXCL" }, \
286 { XFS_MMAPLOCK_SHARED, "MMAPLOCK_SHARED" }
290 * Flags for lockdep annotations.
292 * XFS_LOCK_PARENT - for directory operations that require locking a
293 * parent directory inode and a child entry inode. IOLOCK requires nesting,
294 * MMAPLOCK does not support this class, ILOCK requires a single subclass
295 * to differentiate parent from child.
297 * XFS_LOCK_RTBITMAP/XFS_LOCK_RTSUM - the realtime device bitmap and summary
298 * inodes do not participate in the normal lock order, and thus have their
301 * XFS_LOCK_INUMORDER - for locking several inodes at the some time
302 * with xfs_lock_inodes(). This flag is used as the starting subclass
303 * and each subsequent lock acquired will increment the subclass by one.
304 * However, MAX_LOCKDEP_SUBCLASSES == 8, which means we are greatly
305 * limited to the subclasses we can represent via nesting. We need at least
306 * 5 inodes nest depth for the ILOCK through rename, and we also have to support
307 * XFS_ILOCK_PARENT, which gives 6 subclasses. Then we have XFS_ILOCK_RTBITMAP
308 * and XFS_ILOCK_RTSUM, which are another 2 unique subclasses, so that's all
309 * 8 subclasses supported by lockdep.
311 * This also means we have to number the sub-classes in the lowest bits of
312 * the mask we keep, and we have to ensure we never exceed 3 bits of lockdep
313 * mask and we can't use bit-masking to build the subclasses. What a mess.
318 * 16-19 XFS_IOLOCK_SHIFT dependencies
319 * 20-23 XFS_MMAPLOCK_SHIFT dependencies
320 * 24-31 XFS_ILOCK_SHIFT dependencies
333 * 0-4 subclass values
334 * 5 PARENT subclass (not nestable)
335 * 6 RTBITMAP subclass (not nestable)
336 * 7 RTSUM subclass (not nestable)
339 #define XFS_IOLOCK_SHIFT 16
340 #define XFS_IOLOCK_MAX_SUBCLASS 3
341 #define XFS_IOLOCK_DEP_MASK 0x000f0000
343 #define XFS_MMAPLOCK_SHIFT 20
344 #define XFS_MMAPLOCK_NUMORDER 0
345 #define XFS_MMAPLOCK_MAX_SUBCLASS 3
346 #define XFS_MMAPLOCK_DEP_MASK 0x00f00000
348 #define XFS_ILOCK_SHIFT 24
349 #define XFS_ILOCK_PARENT_VAL 5
350 #define XFS_ILOCK_MAX_SUBCLASS (XFS_ILOCK_PARENT_VAL - 1)
351 #define XFS_ILOCK_RTBITMAP_VAL 6
352 #define XFS_ILOCK_RTSUM_VAL 7
353 #define XFS_ILOCK_DEP_MASK 0xff000000
354 #define XFS_ILOCK_PARENT (XFS_ILOCK_PARENT_VAL << XFS_ILOCK_SHIFT)
355 #define XFS_ILOCK_RTBITMAP (XFS_ILOCK_RTBITMAP_VAL << XFS_ILOCK_SHIFT)
356 #define XFS_ILOCK_RTSUM (XFS_ILOCK_RTSUM_VAL << XFS_ILOCK_SHIFT)
358 #define XFS_LOCK_SUBCLASS_MASK (XFS_IOLOCK_DEP_MASK | \
359 XFS_MMAPLOCK_DEP_MASK | \
362 #define XFS_IOLOCK_DEP(flags) (((flags) & XFS_IOLOCK_DEP_MASK) \
364 #define XFS_MMAPLOCK_DEP(flags) (((flags) & XFS_MMAPLOCK_DEP_MASK) \
365 >> XFS_MMAPLOCK_SHIFT)
366 #define XFS_ILOCK_DEP(flags) (((flags) & XFS_ILOCK_DEP_MASK) \
370 * Layouts are broken in the BREAK_WRITE case to ensure that
371 * layout-holders do not collide with local writes. Additionally,
372 * layouts are broken in the BREAK_UNMAP case to make sure the
373 * layout-holder has a consistent view of the file's extent map. While
374 * BREAK_WRITE breaks can be satisfied by recalling FL_LAYOUT leases,
375 * BREAK_UNMAP breaks additionally require waiting for busy dax-pages to
378 enum layout_break_reason {
384 * For multiple groups support: if S_ISGID bit is set in the parent
385 * directory, group of new file is set to that of the parent, and
386 * new subdirectory gets S_ISGID bit from parent.
388 #define XFS_INHERIT_GID(pip) \
389 (((pip)->i_mount->m_flags & XFS_MOUNT_GRPID) || \
390 (VFS_I(pip)->i_mode & S_ISGID))
392 int xfs_release(struct xfs_inode *ip);
393 void xfs_inactive(struct xfs_inode *ip);
394 int xfs_lookup(struct xfs_inode *dp, struct xfs_name *name,
395 struct xfs_inode **ipp, struct xfs_name *ci_name);
396 int xfs_create(struct xfs_inode *dp, struct xfs_name *name,
397 umode_t mode, dev_t rdev, struct xfs_inode **ipp);
398 int xfs_create_tmpfile(struct xfs_inode *dp, umode_t mode,
399 struct xfs_inode **ipp);
400 int xfs_remove(struct xfs_inode *dp, struct xfs_name *name,
401 struct xfs_inode *ip);
402 int xfs_link(struct xfs_inode *tdp, struct xfs_inode *sip,
403 struct xfs_name *target_name);
404 int xfs_rename(struct xfs_inode *src_dp, struct xfs_name *src_name,
405 struct xfs_inode *src_ip, struct xfs_inode *target_dp,
406 struct xfs_name *target_name,
407 struct xfs_inode *target_ip, unsigned int flags);
409 void xfs_ilock(xfs_inode_t *, uint);
410 int xfs_ilock_nowait(xfs_inode_t *, uint);
411 void xfs_iunlock(xfs_inode_t *, uint);
412 void xfs_ilock_demote(xfs_inode_t *, uint);
413 int xfs_isilocked(xfs_inode_t *, uint);
414 uint xfs_ilock_data_map_shared(struct xfs_inode *);
415 uint xfs_ilock_attr_map_shared(struct xfs_inode *);
417 uint xfs_ip2xflags(struct xfs_inode *);
418 int xfs_ifree(struct xfs_trans *, struct xfs_inode *);
419 int xfs_itruncate_extents_flags(struct xfs_trans **,
420 struct xfs_inode *, int, xfs_fsize_t, int);
421 void xfs_iext_realloc(xfs_inode_t *, int, int);
423 void xfs_iunpin_wait(xfs_inode_t *);
424 #define xfs_ipincount(ip) ((unsigned int) atomic_read(&ip->i_pincount))
426 int xfs_iflush(struct xfs_inode *, struct xfs_buf **);
427 void xfs_lock_two_inodes(struct xfs_inode *ip0, uint ip0_mode,
428 struct xfs_inode *ip1, uint ip1_mode);
430 xfs_extlen_t xfs_get_extsz_hint(struct xfs_inode *ip);
431 xfs_extlen_t xfs_get_cowextsz_hint(struct xfs_inode *ip);
433 int xfs_dir_ialloc(struct xfs_trans **, struct xfs_inode *, umode_t,
434 xfs_nlink_t, dev_t, prid_t,
435 struct xfs_inode **);
438 xfs_itruncate_extents(
439 struct xfs_trans **tpp,
440 struct xfs_inode *ip,
442 xfs_fsize_t new_size)
444 return xfs_itruncate_extents_flags(tpp, ip, whichfork, new_size, 0);
447 /* from xfs_file.c */
448 enum xfs_prealloc_flags {
449 XFS_PREALLOC_SET = (1 << 1),
450 XFS_PREALLOC_CLEAR = (1 << 2),
451 XFS_PREALLOC_SYNC = (1 << 3),
452 XFS_PREALLOC_INVISIBLE = (1 << 4),
455 int xfs_update_prealloc_flags(struct xfs_inode *ip,
456 enum xfs_prealloc_flags flags);
457 int xfs_break_layouts(struct inode *inode, uint *iolock,
458 enum layout_break_reason reason);
460 /* from xfs_iops.c */
461 extern void xfs_setup_inode(struct xfs_inode *ip);
462 extern void xfs_setup_iops(struct xfs_inode *ip);
465 * When setting up a newly allocated inode, we need to call
466 * xfs_finish_inode_setup() once the inode is fully instantiated at
467 * the VFS level to prevent the rest of the world seeing the inode
468 * before we've completed instantiation. Otherwise we can do it
469 * the moment the inode lookup is complete.
471 static inline void xfs_finish_inode_setup(struct xfs_inode *ip)
473 xfs_iflags_clear(ip, XFS_INEW);
475 unlock_new_inode(VFS_I(ip));
476 wake_up_bit(&ip->i_flags, __XFS_INEW_BIT);
479 static inline void xfs_setup_existing_inode(struct xfs_inode *ip)
483 xfs_finish_inode_setup(ip);
488 ASSERT(atomic_read(&VFS_I(ip)->i_count) > 0) ; \
490 trace_xfs_ihold(ip, _THIS_IP_); \
495 trace_xfs_irele(ip, _THIS_IP_); \
499 extern struct kmem_zone *xfs_inode_zone;
501 /* The default CoW extent size hint. */
502 #define XFS_DEFAULT_COWEXTSZ_HINT 32
504 bool xfs_inode_verify_forks(struct xfs_inode *ip);
506 #endif /* __XFS_INODE_H__ */