root/fs/xfs/xfs_inode.h

INCLUDED FROM

DEFINITIONS

1. XFS_I
2. VFS_I
3. XFS_ISIZE
4. xfs_new_eof
5. __xfs_iflags_set
6. xfs_iflags_set
7. xfs_iflags_clear
8. __xfs_iflags_test
9. xfs_iflags_test
10. xfs_iflags_test_and_clear
11. xfs_iflags_test_and_set
12. xfs_get_projid
13. xfs_set_projid
14. xfs_get_initial_prid
15. xfs_is_reflink_inode
16. xfs_inode_has_cow_data
17. xfs_isiflocked
18. xfs_iflock_nowait
19. xfs_iflock
20. xfs_ifunlock
21. xfs_itruncate_extents
22. xfs_finish_inode_setup
23. xfs_setup_existing_inode

   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  */
  15 struct xfs_dinode;
  16 struct xfs_inode;
  17 struct xfs_buf;
  18 struct xfs_bmbt_irec;
  19 struct xfs_inode_log_item;
  20 struct xfs_mount;
  21 struct xfs_trans;
  22 struct xfs_dquot;
  23 
  24 typedef 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_afp;         /* attribute fork pointer */
  37         struct xfs_ifork        *i_cowfp;       /* copy on write extents */
  38         struct xfs_ifork        i_df;           /* data fork */
  39 
  40         /* operations vectors */
  41         const struct xfs_dir_ops *d_ops;                /* directory ops vector */
  42 
  43         /* Transaction and locking information. */
  44         struct xfs_inode_log_item *i_itemp;     /* logging information */
  45         mrlock_t                i_lock;         /* inode lock */
  46         mrlock_t                i_mmaplock;     /* inode mmap IO lock */
  47         atomic_t                i_pincount;     /* inode pin count */
  48 
  49         /*
  50          * Bitsets of inode metadata that have been checked and/or are sick.
  51          * Callers must hold i_flags_lock before accessing this field.
  52          */
  53         uint16_t                i_checked;
  54         uint16_t                i_sick;
  55 
  56         spinlock_t              i_flags_lock;   /* inode i_flags lock */
  57         /* Miscellaneous state. */
  58         unsigned long           i_flags;        /* see defined flags below */
  59         uint64_t                i_delayed_blks; /* count of delay alloc blks */
  60 
  61         struct xfs_icdinode     i_d;            /* most of ondisk inode */
  62 
  63         xfs_extnum_t            i_cnextents;    /* # of extents in cow fork */
  64         unsigned int            i_cformat;      /* format of cow fork */
  65 
  66         /* VFS inode */
  67         struct inode            i_vnode;        /* embedded VFS inode */
  68 
  69         /* pending io completions */
  70         spinlock_t              i_ioend_lock;
  71         struct work_struct      i_ioend_work;
  72         struct list_head        i_ioend_list;
  73 } xfs_inode_t;
  74 
  75 /* Convert from vfs inode to xfs inode */
  76 static inline struct xfs_inode *XFS_I(struct inode *inode)
  77 {
  78         return container_of(inode, struct xfs_inode, i_vnode);
  79 }
  80 
  81 /* convert from xfs inode to vfs inode */
  82 static inline struct inode *VFS_I(struct xfs_inode *ip)
  83 {
  84         return &ip->i_vnode;
  85 }
  86 
  87 /*
  88  * For regular files we only update the on-disk filesize when actually
  89  * writing data back to disk.  Until then only the copy in the VFS inode
  90  * is uptodate.
  91  */
  92 static inline xfs_fsize_t XFS_ISIZE(struct xfs_inode *ip)
  93 {
  94         if (S_ISREG(VFS_I(ip)->i_mode))
  95                 return i_size_read(VFS_I(ip));
  96         return ip->i_d.di_size;
  97 }
  98 
  99 /*
 100  * If this I/O goes past the on-disk inode size update it unless it would
 101  * be past the current in-core inode size.
 102  */
 103 static inline xfs_fsize_t
 104 xfs_new_eof(struct xfs_inode *ip, xfs_fsize_t new_size)
 105 {
 106         xfs_fsize_t i_size = i_size_read(VFS_I(ip));
 107 
 108         if (new_size > i_size || new_size < 0)
 109                 new_size = i_size;
 110         return new_size > ip->i_d.di_size ? new_size : 0;
 111 }
 112 
 113 /*
 114  * i_flags helper functions
 115  */
 116 static inline void
 117 __xfs_iflags_set(xfs_inode_t *ip, unsigned short flags)
 118 {
 119         ip->i_flags |= flags;
 120 }
 121 
 122 static inline void
 123 xfs_iflags_set(xfs_inode_t *ip, unsigned short flags)
 124 {
 125         spin_lock(&ip->i_flags_lock);
 126         __xfs_iflags_set(ip, flags);
 127         spin_unlock(&ip->i_flags_lock);
 128 }
 129 
 130 static inline void
 131 xfs_iflags_clear(xfs_inode_t *ip, unsigned short flags)
 132 {
 133         spin_lock(&ip->i_flags_lock);
 134         ip->i_flags &= ~flags;
 135         spin_unlock(&ip->i_flags_lock);
 136 }
 137 
 138 static inline int
 139 __xfs_iflags_test(xfs_inode_t *ip, unsigned short flags)
 140 {
 141         return (ip->i_flags & flags);
 142 }
 143 
 144 static inline int
 145 xfs_iflags_test(xfs_inode_t *ip, unsigned short flags)
 146 {
 147         int ret;
 148         spin_lock(&ip->i_flags_lock);
 149         ret = __xfs_iflags_test(ip, flags);
 150         spin_unlock(&ip->i_flags_lock);
 151         return ret;
 152 }
 153 
 154 static inline int
 155 xfs_iflags_test_and_clear(xfs_inode_t *ip, unsigned short flags)
 156 {
 157         int ret;
 158 
 159         spin_lock(&ip->i_flags_lock);
 160         ret = ip->i_flags & flags;
 161         if (ret)
 162                 ip->i_flags &= ~flags;
 163         spin_unlock(&ip->i_flags_lock);
 164         return ret;
 165 }
 166 
 167 static inline int
 168 xfs_iflags_test_and_set(xfs_inode_t *ip, unsigned short flags)
 169 {
 170         int ret;
 171 
 172         spin_lock(&ip->i_flags_lock);
 173         ret = ip->i_flags & flags;
 174         if (!ret)
 175                 ip->i_flags |= flags;
 176         spin_unlock(&ip->i_flags_lock);
 177         return ret;
 178 }
 179 
 180 /*
 181  * Project quota id helpers (previously projid was 16bit only
 182  * and using two 16bit values to hold new 32bit projid was chosen
 183  * to retain compatibility with "old" filesystems).
 184  */
 185 static inline prid_t
 186 xfs_get_projid(struct xfs_inode *ip)
 187 {
 188         return (prid_t)ip->i_d.di_projid_hi << 16 | ip->i_d.di_projid_lo;
 189 }
 190 
 191 static inline void
 192 xfs_set_projid(struct xfs_inode *ip,
 193                 prid_t projid)
 194 {
 195         ip->i_d.di_projid_hi = (uint16_t) (projid >> 16);
 196         ip->i_d.di_projid_lo = (uint16_t) (projid & 0xffff);
 197 }
 198 
 199 static inline prid_t
 200 xfs_get_initial_prid(struct xfs_inode *dp)
 201 {
 202         if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
 203                 return xfs_get_projid(dp);
 204 
 205         return XFS_PROJID_DEFAULT;
 206 }
 207 
 208 static inline bool xfs_is_reflink_inode(struct xfs_inode *ip)
 209 {
 210         return ip->i_d.di_flags2 & XFS_DIFLAG2_REFLINK;
 211 }
 212 
 213 /*
 214  * Check if an inode has any data in the COW fork.  This might be often false
 215  * even for inodes with the reflink flag when there is no pending COW operation.
 216  */
 217 static inline bool xfs_inode_has_cow_data(struct xfs_inode *ip)
 218 {
 219         return ip->i_cowfp && ip->i_cowfp->if_bytes;
 220 }
 221 
 222 /*
 223  * In-core inode flags.
 224  */
 225 #define XFS_IRECLAIM            (1 << 0) /* started reclaiming this inode */
 226 #define XFS_ISTALE              (1 << 1) /* inode has been staled */
 227 #define XFS_IRECLAIMABLE        (1 << 2) /* inode can be reclaimed */
 228 #define __XFS_INEW_BIT          3        /* inode has just been allocated */
 229 #define XFS_INEW                (1 << __XFS_INEW_BIT)
 230 #define XFS_ITRUNCATED          (1 << 5) /* truncated down so flush-on-close */
 231 #define XFS_IDIRTY_RELEASE      (1 << 6) /* dirty release already seen */
 232 #define __XFS_IFLOCK_BIT        7        /* inode is being flushed right now */
 233 #define XFS_IFLOCK              (1 << __XFS_IFLOCK_BIT)
 234 #define __XFS_IPINNED_BIT       8        /* wakeup key for zero pin count */
 235 #define XFS_IPINNED             (1 << __XFS_IPINNED_BIT)
 236 #define XFS_IDONTCACHE          (1 << 9) /* don't cache the inode long term */
 237 #define XFS_IEOFBLOCKS          (1 << 10)/* has the preallocblocks tag set */
 238 /*
 239  * If this unlinked inode is in the middle of recovery, don't let drop_inode
 240  * truncate and free the inode.  This can happen if we iget the inode during
 241  * log recovery to replay a bmap operation on the inode.
 242  */
 243 #define XFS_IRECOVERY           (1 << 11)
 244 #define XFS_ICOWBLOCKS          (1 << 12)/* has the cowblocks tag set */
 245 
 246 /*
 247  * Per-lifetime flags need to be reset when re-using a reclaimable inode during
 248  * inode lookup. This prevents unintended behaviour on the new inode from
 249  * ocurring.
 250  */
 251 #define XFS_IRECLAIM_RESET_FLAGS        \
 252         (XFS_IRECLAIMABLE | XFS_IRECLAIM | \
 253          XFS_IDIRTY_RELEASE | XFS_ITRUNCATED)
 254 
 255 /*
 256  * Synchronize processes attempting to flush the in-core inode back to disk.
 257  */
 258 
 259 static inline int xfs_isiflocked(struct xfs_inode *ip)
 260 {
 261         return xfs_iflags_test(ip, XFS_IFLOCK);
 262 }
 263 
 264 extern void __xfs_iflock(struct xfs_inode *ip);
 265 
 266 static inline int xfs_iflock_nowait(struct xfs_inode *ip)
 267 {
 268         return !xfs_iflags_test_and_set(ip, XFS_IFLOCK);
 269 }
 270 
 271 static inline void xfs_iflock(struct xfs_inode *ip)
 272 {
 273         if (!xfs_iflock_nowait(ip))
 274                 __xfs_iflock(ip);
 275 }
 276 
 277 static inline void xfs_ifunlock(struct xfs_inode *ip)
 278 {
 279         ASSERT(xfs_isiflocked(ip));
 280         xfs_iflags_clear(ip, XFS_IFLOCK);
 281         smp_mb();
 282         wake_up_bit(&ip->i_flags, __XFS_IFLOCK_BIT);
 283 }
 284 
 285 /*
 286  * Flags for inode locking.
 287  * Bit ranges:  1<<1  - 1<<16-1 -- iolock/ilock modes (bitfield)
 288  *              1<<16 - 1<<32-1 -- lockdep annotation (integers)
 289  */
 290 #define XFS_IOLOCK_EXCL         (1<<0)
 291 #define XFS_IOLOCK_SHARED       (1<<1)
 292 #define XFS_ILOCK_EXCL          (1<<2)
 293 #define XFS_ILOCK_SHARED        (1<<3)
 294 #define XFS_MMAPLOCK_EXCL       (1<<4)
 295 #define XFS_MMAPLOCK_SHARED     (1<<5)
 296 
 297 #define XFS_LOCK_MASK           (XFS_IOLOCK_EXCL | XFS_IOLOCK_SHARED \
 298                                 | XFS_ILOCK_EXCL | XFS_ILOCK_SHARED \
 299                                 | XFS_MMAPLOCK_EXCL | XFS_MMAPLOCK_SHARED)
 300 
 301 #define XFS_LOCK_FLAGS \
 302         { XFS_IOLOCK_EXCL,      "IOLOCK_EXCL" }, \
 303         { XFS_IOLOCK_SHARED,    "IOLOCK_SHARED" }, \
 304         { XFS_ILOCK_EXCL,       "ILOCK_EXCL" }, \
 305         { XFS_ILOCK_SHARED,     "ILOCK_SHARED" }, \
 306         { XFS_MMAPLOCK_EXCL,    "MMAPLOCK_EXCL" }, \
 307         { XFS_MMAPLOCK_SHARED,  "MMAPLOCK_SHARED" }
 308 
 309 
 310 /*
 311  * Flags for lockdep annotations.
 312  *
 313  * XFS_LOCK_PARENT - for directory operations that require locking a
 314  * parent directory inode and a child entry inode. IOLOCK requires nesting,
 315  * MMAPLOCK does not support this class, ILOCK requires a single subclass
 316  * to differentiate parent from child.
 317  *
 318  * XFS_LOCK_RTBITMAP/XFS_LOCK_RTSUM - the realtime device bitmap and summary
 319  * inodes do not participate in the normal lock order, and thus have their
 320  * own subclasses.
 321  *
 322  * XFS_LOCK_INUMORDER - for locking several inodes at the some time
 323  * with xfs_lock_inodes().  This flag is used as the starting subclass
 324  * and each subsequent lock acquired will increment the subclass by one.
 325  * However, MAX_LOCKDEP_SUBCLASSES == 8, which means we are greatly
 326  * limited to the subclasses we can represent via nesting. We need at least
 327  * 5 inodes nest depth for the ILOCK through rename, and we also have to support
 328  * XFS_ILOCK_PARENT, which gives 6 subclasses. Then we have XFS_ILOCK_RTBITMAP
 329  * and XFS_ILOCK_RTSUM, which are another 2 unique subclasses, so that's all
 330  * 8 subclasses supported by lockdep.
 331  *
 332  * This also means we have to number the sub-classes in the lowest bits of
 333  * the mask we keep, and we have to ensure we never exceed 3 bits of lockdep
 334  * mask and we can't use bit-masking to build the subclasses. What a mess.
 335  *
 336  * Bit layout:
 337  *
 338  * Bit          Lock Region
 339  * 16-19        XFS_IOLOCK_SHIFT dependencies
 340  * 20-23        XFS_MMAPLOCK_SHIFT dependencies
 341  * 24-31        XFS_ILOCK_SHIFT dependencies
 342  *
 343  * IOLOCK values
 344  *
 345  * 0-3          subclass value
 346  * 4-7          unused
 347  *
 348  * MMAPLOCK values
 349  *
 350  * 0-3          subclass value
 351  * 4-7          unused
 352  *
 353  * ILOCK values
 354  * 0-4          subclass values
 355  * 5            PARENT subclass (not nestable)
 356  * 6            RTBITMAP subclass (not nestable)
 357  * 7            RTSUM subclass (not nestable)
 358  * 
 359  */
 360 #define XFS_IOLOCK_SHIFT                16
 361 #define XFS_IOLOCK_MAX_SUBCLASS         3
 362 #define XFS_IOLOCK_DEP_MASK             0x000f0000
 363 
 364 #define XFS_MMAPLOCK_SHIFT              20
 365 #define XFS_MMAPLOCK_NUMORDER           0
 366 #define XFS_MMAPLOCK_MAX_SUBCLASS       3
 367 #define XFS_MMAPLOCK_DEP_MASK           0x00f00000
 368 
 369 #define XFS_ILOCK_SHIFT                 24
 370 #define XFS_ILOCK_PARENT_VAL            5
 371 #define XFS_ILOCK_MAX_SUBCLASS          (XFS_ILOCK_PARENT_VAL - 1)
 372 #define XFS_ILOCK_RTBITMAP_VAL          6
 373 #define XFS_ILOCK_RTSUM_VAL             7
 374 #define XFS_ILOCK_DEP_MASK              0xff000000
 375 #define XFS_ILOCK_PARENT                (XFS_ILOCK_PARENT_VAL << XFS_ILOCK_SHIFT)
 376 #define XFS_ILOCK_RTBITMAP              (XFS_ILOCK_RTBITMAP_VAL << XFS_ILOCK_SHIFT)
 377 #define XFS_ILOCK_RTSUM                 (XFS_ILOCK_RTSUM_VAL << XFS_ILOCK_SHIFT)
 378 
 379 #define XFS_LOCK_SUBCLASS_MASK  (XFS_IOLOCK_DEP_MASK | \
 380                                  XFS_MMAPLOCK_DEP_MASK | \
 381                                  XFS_ILOCK_DEP_MASK)
 382 
 383 #define XFS_IOLOCK_DEP(flags)   (((flags) & XFS_IOLOCK_DEP_MASK) \
 384                                         >> XFS_IOLOCK_SHIFT)
 385 #define XFS_MMAPLOCK_DEP(flags) (((flags) & XFS_MMAPLOCK_DEP_MASK) \
 386                                         >> XFS_MMAPLOCK_SHIFT)
 387 #define XFS_ILOCK_DEP(flags)    (((flags) & XFS_ILOCK_DEP_MASK) \
 388                                         >> XFS_ILOCK_SHIFT)
 389 
 390 /*
 391  * Layouts are broken in the BREAK_WRITE case to ensure that
 392  * layout-holders do not collide with local writes. Additionally,
 393  * layouts are broken in the BREAK_UNMAP case to make sure the
 394  * layout-holder has a consistent view of the file's extent map. While
 395  * BREAK_WRITE breaks can be satisfied by recalling FL_LAYOUT leases,
 396  * BREAK_UNMAP breaks additionally require waiting for busy dax-pages to
 397  * go idle.
 398  */
 399 enum layout_break_reason {
 400         BREAK_WRITE,
 401         BREAK_UNMAP,
 402 };
 403 
 404 /*
 405  * For multiple groups support: if S_ISGID bit is set in the parent
 406  * directory, group of new file is set to that of the parent, and
 407  * new subdirectory gets S_ISGID bit from parent.
 408  */
 409 #define XFS_INHERIT_GID(pip)    \
 410         (((pip)->i_mount->m_flags & XFS_MOUNT_GRPID) || \
 411          (VFS_I(pip)->i_mode & S_ISGID))
 412 
 413 int             xfs_release(struct xfs_inode *ip);
 414 void            xfs_inactive(struct xfs_inode *ip);
 415 int             xfs_lookup(struct xfs_inode *dp, struct xfs_name *name,
 416                            struct xfs_inode **ipp, struct xfs_name *ci_name);
 417 int             xfs_create(struct xfs_inode *dp, struct xfs_name *name,
 418                            umode_t mode, dev_t rdev, struct xfs_inode **ipp);
 419 int             xfs_create_tmpfile(struct xfs_inode *dp, umode_t mode,
 420                            struct xfs_inode **ipp);
 421 int             xfs_remove(struct xfs_inode *dp, struct xfs_name *name,
 422                            struct xfs_inode *ip);
 423 int             xfs_link(struct xfs_inode *tdp, struct xfs_inode *sip,
 424                          struct xfs_name *target_name);
 425 int             xfs_rename(struct xfs_inode *src_dp, struct xfs_name *src_name,
 426                            struct xfs_inode *src_ip, struct xfs_inode *target_dp,
 427                            struct xfs_name *target_name,
 428                            struct xfs_inode *target_ip, unsigned int flags);
 429 
 430 void            xfs_ilock(xfs_inode_t *, uint);
 431 int             xfs_ilock_nowait(xfs_inode_t *, uint);
 432 void            xfs_iunlock(xfs_inode_t *, uint);
 433 void            xfs_ilock_demote(xfs_inode_t *, uint);
 434 int             xfs_isilocked(xfs_inode_t *, uint);
 435 uint            xfs_ilock_data_map_shared(struct xfs_inode *);
 436 uint            xfs_ilock_attr_map_shared(struct xfs_inode *);
 437 
 438 uint            xfs_ip2xflags(struct xfs_inode *);
 439 int             xfs_ifree(struct xfs_trans *, struct xfs_inode *);
 440 int             xfs_itruncate_extents_flags(struct xfs_trans **,
 441                                 struct xfs_inode *, int, xfs_fsize_t, int);
 442 void            xfs_iext_realloc(xfs_inode_t *, int, int);
 443 
 444 void            xfs_iunpin_wait(xfs_inode_t *);
 445 #define xfs_ipincount(ip)       ((unsigned int) atomic_read(&ip->i_pincount))
 446 
 447 int             xfs_iflush(struct xfs_inode *, struct xfs_buf **);
 448 void            xfs_lock_two_inodes(struct xfs_inode *ip0, uint ip0_mode,
 449                                 struct xfs_inode *ip1, uint ip1_mode);
 450 
 451 xfs_extlen_t    xfs_get_extsz_hint(struct xfs_inode *ip);
 452 xfs_extlen_t    xfs_get_cowextsz_hint(struct xfs_inode *ip);
 453 
 454 int             xfs_dir_ialloc(struct xfs_trans **, struct xfs_inode *, umode_t,
 455                                xfs_nlink_t, dev_t, prid_t,
 456                                struct xfs_inode **);
 457 
 458 static inline int
 459 xfs_itruncate_extents(
 460         struct xfs_trans        **tpp,
 461         struct xfs_inode        *ip,
 462         int                     whichfork,
 463         xfs_fsize_t             new_size)
 464 {
 465         return xfs_itruncate_extents_flags(tpp, ip, whichfork, new_size, 0);
 466 }
 467 
 468 /* from xfs_file.c */
 469 enum xfs_prealloc_flags {
 470         XFS_PREALLOC_SET        = (1 << 1),
 471         XFS_PREALLOC_CLEAR      = (1 << 2),
 472         XFS_PREALLOC_SYNC       = (1 << 3),
 473         XFS_PREALLOC_INVISIBLE  = (1 << 4),
 474 };
 475 
 476 int     xfs_update_prealloc_flags(struct xfs_inode *ip,
 477                                   enum xfs_prealloc_flags flags);
 478 int     xfs_break_layouts(struct inode *inode, uint *iolock,
 479                 enum layout_break_reason reason);
 480 
 481 /* from xfs_iops.c */
 482 extern void xfs_setup_inode(struct xfs_inode *ip);
 483 extern void xfs_setup_iops(struct xfs_inode *ip);
 484 
 485 /*
 486  * When setting up a newly allocated inode, we need to call
 487  * xfs_finish_inode_setup() once the inode is fully instantiated at
 488  * the VFS level to prevent the rest of the world seeing the inode
 489  * before we've completed instantiation. Otherwise we can do it
 490  * the moment the inode lookup is complete.
 491  */
 492 static inline void xfs_finish_inode_setup(struct xfs_inode *ip)
 493 {
 494         xfs_iflags_clear(ip, XFS_INEW);
 495         barrier();
 496         unlock_new_inode(VFS_I(ip));
 497         wake_up_bit(&ip->i_flags, __XFS_INEW_BIT);
 498 }
 499 
 500 static inline void xfs_setup_existing_inode(struct xfs_inode *ip)
 501 {
 502         xfs_setup_inode(ip);
 503         xfs_setup_iops(ip);
 504         xfs_finish_inode_setup(ip);
 505 }
 506 
 507 void xfs_irele(struct xfs_inode *ip);
 508 
 509 extern struct kmem_zone *xfs_inode_zone;
 510 
 511 /* The default CoW extent size hint. */
 512 #define XFS_DEFAULT_COWEXTSZ_HINT 32
 513 
 514 bool xfs_inode_verify_forks(struct xfs_inode *ip);
 515 
 516 int xfs_iunlink_init(struct xfs_perag *pag);
 517 void xfs_iunlink_destroy(struct xfs_perag *pag);
 518 
 519 void xfs_end_io(struct work_struct *work);
 520 
 521 #endif  /* __XFS_INODE_H__ */