fs/xfs/xfs_inode.h

   1 /*
   2  * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #ifndef __XFS_INODE_H__
  19 #define __XFS_INODE_H__
  20
  21 struct posix_acl;
  22 struct xfs_dinode;
  23 struct xfs_inode;
  24
  25 /*
  26  * Fork identifiers.
  27  */
  28 #define XFS_DATA_FORK   0
  29 #define XFS_ATTR_FORK   1
  30
  31 /*
  32  * The following xfs_ext_irec_t struct introduces a second (top) level
  33  * to the in-core extent allocation scheme. These structs are allocated
  34  * in a contiguous block, creating an indirection array where each entry
  35  * (irec) contains a pointer to a buffer of in-core extent records which
  36  * it manages. Each extent buffer is 4k in size, since 4k is the system
  37  * page size on Linux i386 and systems with larger page sizes don't seem
  38  * to gain much, if anything, by using their native page size as the
  39  * extent buffer size. Also, using 4k extent buffers everywhere provides
  40  * a consistent interface for CXFS across different platforms.
  41  *
  42  * There is currently no limit on the number of irec's (extent lists)
  43  * allowed, so heavily fragmented files may require an indirection array
  44  * which spans multiple system pages of memory. The number of extents
  45  * which would require this amount of contiguous memory is very large
  46  * and should not cause problems in the foreseeable future. However,
  47  * if the memory needed for the contiguous array ever becomes a problem,
  48  * it is possible that a third level of indirection may be required.
  49  */
  50 typedef struct xfs_ext_irec {
  51         xfs_bmbt_rec_host_t *er_extbuf; /* block of extent records */
  52         xfs_extnum_t    er_extoff;      /* extent offset in file */
  53         xfs_extnum_t    er_extcount;    /* number of extents in page/block */
  54 } xfs_ext_irec_t;
  55
  56 /*
  57  * File incore extent information, present for each of data & attr forks.
  58  */
  59 #define XFS_IEXT_BUFSZ          4096
  60 #define XFS_LINEAR_EXTS         (XFS_IEXT_BUFSZ / (uint)sizeof(xfs_bmbt_rec_t))
  61 #define XFS_INLINE_EXTS         2
  62 #define XFS_INLINE_DATA         32
  63 typedef struct xfs_ifork {
  64         int                     if_bytes;       /* bytes in if_u1 */
  65         int                     if_real_bytes;  /* bytes allocated in if_u1 */
  66         struct xfs_btree_block  *if_broot;      /* file's incore btree root */
  67         short                   if_broot_bytes; /* bytes allocated for root */
  68         unsigned char           if_flags;       /* per-fork flags */
  69         union {
  70                 xfs_bmbt_rec_host_t *if_extents;/* linear map file exts */
  71                 xfs_ext_irec_t  *if_ext_irec;   /* irec map file exts */
  72                 char            *if_data;       /* inline file data */
  73         } if_u1;
  74         union {
  75                 xfs_bmbt_rec_host_t if_inline_ext[XFS_INLINE_EXTS];
  76                                                 /* very small file extents */
  77                 char            if_inline_data[XFS_INLINE_DATA];
  78                                                 /* very small file data */
  79                 xfs_dev_t       if_rdev;        /* dev number if special */
  80                 uuid_t          if_uuid;        /* mount point value */
  81         } if_u2;
  82 } xfs_ifork_t;
  83
  84 /*
  85  * Inode location information.  Stored in the inode and passed to
  86  * xfs_imap_to_bp() to get a buffer and dinode for a given inode.
  87  */
  88 struct xfs_imap {
  89         xfs_daddr_t     im_blkno;       /* starting BB of inode chunk */
  90         ushort          im_len;         /* length in BBs of inode chunk */
  91         ushort          im_boffset;     /* inode offset in block in bytes */
  92 };
  93
  94 /*
  95  * This is the xfs in-core inode structure.
  96  * Most of the on-disk inode is embedded in the i_d field.
  97  *
  98  * The extent pointers/inline file space, however, are managed
  99  * separately.  The memory for this information is pointed to by
 100  * the if_u1 unions depending on the type of the data.
 101  * This is used to linearize the array of extents for fast in-core
 102  * access.  This is used until the file's number of extents
 103  * surpasses XFS_MAX_INCORE_EXTENTS, at which point all extent pointers
 104  * are accessed through the buffer cache.
 105  *
 106  * Other state kept in the in-core inode is used for identification,
 107  * locking, transactional updating, etc of the inode.
 108  *
 109  * Generally, we do not want to hold the i_rlock while holding the
 110  * i_ilock. Hierarchy is i_iolock followed by i_rlock.
 111  *
 112  * xfs_iptr_t contains all the inode fields up to and including the
 113  * i_mnext and i_mprev fields, it is used as a marker in the inode
 114  * chain off the mount structure by xfs_sync calls.
 115  */
 116
 117 typedef struct xfs_ictimestamp {
 118         __int32_t       t_sec;          /* timestamp seconds */
 119         __int32_t       t_nsec;         /* timestamp nanoseconds */
 120 } xfs_ictimestamp_t;
 121
 122 /*
 123  * NOTE:  This structure must be kept identical to struct xfs_dinode
 124  *        in xfs_dinode.h except for the endianness annotations.
 125  */
 126 typedef struct xfs_icdinode {
 127         __uint16_t      di_magic;       /* inode magic # = XFS_DINODE_MAGIC */
 128         __uint16_t      di_mode;        /* mode and type of file */
 129         __int8_t        di_version;     /* inode version */
 130         __int8_t        di_format;      /* format of di_c data */
 131         __uint16_t      di_onlink;      /* old number of links to file */
 132         __uint32_t      di_uid;         /* owner's user id */
 133         __uint32_t      di_gid;         /* owner's group id */
 134         __uint32_t      di_nlink;       /* number of links to file */
 135         __uint16_t      di_projid_lo;   /* lower part of owner's project id */
 136         __uint16_t      di_projid_hi;   /* higher part of owner's project id */
 137         __uint8_t       di_pad[6];      /* unused, zeroed space */
 138         __uint16_t      di_flushiter;   /* incremented on flush */
 139         xfs_ictimestamp_t di_atime;     /* time last accessed */
 140         xfs_ictimestamp_t di_mtime;     /* time last modified */
 141         xfs_ictimestamp_t di_ctime;     /* time created/inode modified */
 142         xfs_fsize_t     di_size;        /* number of bytes in file */
 143         xfs_drfsbno_t   di_nblocks;     /* # of direct & btree blocks used */
 144         xfs_extlen_t    di_extsize;     /* basic/minimum extent size for file */
 145         xfs_extnum_t    di_nextents;    /* number of extents in data fork */
 146         xfs_aextnum_t   di_anextents;   /* number of extents in attribute fork*/
 147         __uint8_t       di_forkoff;     /* attr fork offs, <<3 for 64b align */
 148         __int8_t        di_aformat;     /* format of attr fork's data */
 149         __uint32_t      di_dmevmask;    /* DMIG event mask */
 150         __uint16_t      di_dmstate;     /* DMIG state info */
 151         __uint16_t      di_flags;       /* random flags, XFS_DIFLAG_... */
 152         __uint32_t      di_gen;         /* generation number */
 153
 154         /* di_next_unlinked is the only non-core field in the old dinode */
 155         xfs_agino_t     di_next_unlinked;/* agi unlinked list ptr */
 156
 157         /* start of the extended dinode, writable fields */
 158         __uint32_t      di_crc;         /* CRC of the inode */
 159         __uint64_t      di_changecount; /* number of attribute changes */
 160         xfs_lsn_t       di_lsn;         /* flush sequence */
 161         __uint64_t      di_flags2;      /* more random flags */
 162         __uint8_t       di_pad2[16];    /* more padding for future expansion */
 163
 164         /* fields only written to during inode creation */
 165         xfs_ictimestamp_t di_crtime;    /* time created */
 166         xfs_ino_t       di_ino;         /* inode number */
 167         uuid_t          di_uuid;        /* UUID of the filesystem */
 168
 169         /* structure must be padded to 64 bit alignment */
 170 } xfs_icdinode_t;
 171
 172 static inline uint xfs_icdinode_size(int version)
 173 {
 174         if (version == 3)
 175                 return sizeof(struct xfs_icdinode);
 176         return offsetof(struct xfs_icdinode, di_next_unlinked);
 177 }
 178
 179 /*
 180  * Flags for xfs_ichgtime().
 181  */
 182 #define XFS_ICHGTIME_MOD        0x1     /* data fork modification timestamp */
 183 #define XFS_ICHGTIME_CHG        0x2     /* inode field change timestamp */
 184 #define XFS_ICHGTIME_CREATE     0x4     /* inode create timestamp */
 185
 186 /*
 187  * Per-fork incore inode flags.
 188  */
 189 #define XFS_IFINLINE    0x01    /* Inline data is read in */
 190 #define XFS_IFEXTENTS   0x02    /* All extent pointers are read in */
 191 #define XFS_IFBROOT     0x04    /* i_broot points to the bmap b-tree root */
 192 #define XFS_IFEXTIREC   0x08    /* Indirection array of extent blocks */
 193
 194 /*
 195  * Fork handling.
 196  */
 197
 198 #define XFS_IFORK_Q(ip)                 ((ip)->i_d.di_forkoff != 0)
 199 #define XFS_IFORK_BOFF(ip)              ((int)((ip)->i_d.di_forkoff << 3))
 200
 201 #define XFS_IFORK_PTR(ip,w)             \
 202         ((w) == XFS_DATA_FORK ? \
 203                 &(ip)->i_df : \
 204                 (ip)->i_afp)
 205 #define XFS_IFORK_DSIZE(ip) \
 206         (XFS_IFORK_Q(ip) ? \
 207                 XFS_IFORK_BOFF(ip) : \
 208                 XFS_LITINO((ip)->i_mount, (ip)->i_d.di_version))
 209 #define XFS_IFORK_ASIZE(ip) \
 210         (XFS_IFORK_Q(ip) ? \
 211                 XFS_LITINO((ip)->i_mount, (ip)->i_d.di_version) - \
 212                         XFS_IFORK_BOFF(ip) : \
 213                 0)
 214 #define XFS_IFORK_SIZE(ip,w) \
 215         ((w) == XFS_DATA_FORK ? \
 216                 XFS_IFORK_DSIZE(ip) : \
 217                 XFS_IFORK_ASIZE(ip))
 218 #define XFS_IFORK_FORMAT(ip,w) \
 219         ((w) == XFS_DATA_FORK ? \
 220                 (ip)->i_d.di_format : \
 221                 (ip)->i_d.di_aformat)
 222 #define XFS_IFORK_FMT_SET(ip,w,n) \
 223         ((w) == XFS_DATA_FORK ? \
 224                 ((ip)->i_d.di_format = (n)) : \
 225                 ((ip)->i_d.di_aformat = (n)))
 226 #define XFS_IFORK_NEXTENTS(ip,w) \
 227         ((w) == XFS_DATA_FORK ? \
 228                 (ip)->i_d.di_nextents : \
 229                 (ip)->i_d.di_anextents)
 230 #define XFS_IFORK_NEXT_SET(ip,w,n) \
 231         ((w) == XFS_DATA_FORK ? \
 232                 ((ip)->i_d.di_nextents = (n)) : \
 233                 ((ip)->i_d.di_anextents = (n)))
 234 #define XFS_IFORK_MAXEXT(ip, w) \
 235         (XFS_IFORK_SIZE(ip, w) / sizeof(xfs_bmbt_rec_t))
 236
 237
 238 #ifdef __KERNEL__
 239
 240 struct xfs_buf;
 241 struct xfs_bmap_free;
 242 struct xfs_bmbt_irec;
 243 struct xfs_inode_log_item;
 244 struct xfs_mount;
 245 struct xfs_trans;
 246 struct xfs_dquot;
 247
 248 typedef struct xfs_inode {
 249         /* Inode linking and identification information. */
 250         struct xfs_mount        *i_mount;       /* fs mount struct ptr */
 251         struct xfs_dquot        *i_udquot;      /* user dquot */
 252         struct xfs_dquot        *i_gdquot;      /* group dquot */
 253         struct xfs_dquot        *i_pdquot;      /* project dquot */
 254
 255         /* Inode location stuff */
 256         xfs_ino_t               i_ino;          /* inode number (agno/agino)*/
 257         struct xfs_imap         i_imap;         /* location for xfs_imap() */
 258
 259         /* Extent information. */
 260         xfs_ifork_t             *i_afp;         /* attribute fork pointer */
 261         xfs_ifork_t             i_df;           /* data fork */
 262
 263         /* Transaction and locking information. */
 264         struct xfs_inode_log_item *i_itemp;     /* logging information */
 265         mrlock_t                i_lock;         /* inode lock */
 266         mrlock_t                i_iolock;       /* inode IO lock */
 267         atomic_t                i_pincount;     /* inode pin count */
 268         spinlock_t              i_flags_lock;   /* inode i_flags lock */
 269         /* Miscellaneous state. */
 270         unsigned long           i_flags;        /* see defined flags below */
 271         unsigned int            i_delayed_blks; /* count of delay alloc blks */
 272
 273         xfs_icdinode_t          i_d;            /* most of ondisk inode */
 274
 275         /* VFS inode */
 276         struct inode            i_vnode;        /* embedded VFS inode */
 277 } xfs_inode_t;
 278
 279 /* Convert from vfs inode to xfs inode */
 280 static inline struct xfs_inode *XFS_I(struct inode *inode)
 281 {
 282         return container_of(inode, struct xfs_inode, i_vnode);
 283 }
 284
 285 /* convert from xfs inode to vfs inode */
 286 static inline struct inode *VFS_I(struct xfs_inode *ip)
 287 {
 288         return &ip->i_vnode;
 289 }
 290
 291 /*
 292  * For regular files we only update the on-disk filesize when actually
 293  * writing data back to disk.  Until then only the copy in the VFS inode
 294  * is uptodate.
 295  */
 296 static inline xfs_fsize_t XFS_ISIZE(struct xfs_inode *ip)
 297 {
 298         if (S_ISREG(ip->i_d.di_mode))
 299                 return i_size_read(VFS_I(ip));
 300         return ip->i_d.di_size;
 301 }
 302
 303 /*
 304  * If this I/O goes past the on-disk inode size update it unless it would
 305  * be past the current in-core inode size.
 306  */
 307 static inline xfs_fsize_t
 308 xfs_new_eof(struct xfs_inode *ip, xfs_fsize_t new_size)
 309 {
 310         xfs_fsize_t i_size = i_size_read(VFS_I(ip));
 311
 312         if (new_size > i_size)
 313                 new_size = i_size;
 314         return new_size > ip->i_d.di_size ? new_size : 0;
 315 }
 316
 317 /*
 318  * i_flags helper functions
 319  */
 320 static inline void
 321 __xfs_iflags_set(xfs_inode_t *ip, unsigned short flags)
 322 {
 323         ip->i_flags |= flags;
 324 }
 325
 326 static inline void
 327 xfs_iflags_set(xfs_inode_t *ip, unsigned short flags)
 328 {
 329         spin_lock(&ip->i_flags_lock);
 330         __xfs_iflags_set(ip, flags);
 331         spin_unlock(&ip->i_flags_lock);
 332 }
 333
 334 static inline void
 335 xfs_iflags_clear(xfs_inode_t *ip, unsigned short flags)
 336 {
 337         spin_lock(&ip->i_flags_lock);
 338         ip->i_flags &= ~flags;
 339         spin_unlock(&ip->i_flags_lock);
 340 }
 341
 342 static inline int
 343 __xfs_iflags_test(xfs_inode_t *ip, unsigned short flags)
 344 {
 345         return (ip->i_flags & flags);
 346 }
 347
 348 static inline int
 349 xfs_iflags_test(xfs_inode_t *ip, unsigned short flags)
 350 {
 351         int ret;
 352         spin_lock(&ip->i_flags_lock);
 353         ret = __xfs_iflags_test(ip, flags);
 354         spin_unlock(&ip->i_flags_lock);
 355         return ret;
 356 }
 357
 358 static inline int
 359 xfs_iflags_test_and_clear(xfs_inode_t *ip, unsigned short flags)
 360 {
 361         int ret;
 362
 363         spin_lock(&ip->i_flags_lock);
 364         ret = ip->i_flags & flags;
 365         if (ret)
 366                 ip->i_flags &= ~flags;
 367         spin_unlock(&ip->i_flags_lock);
 368         return ret;
 369 }
 370
 371 static inline int
 372 xfs_iflags_test_and_set(xfs_inode_t *ip, unsigned short flags)
 373 {
 374         int ret;
 375
 376         spin_lock(&ip->i_flags_lock);
 377         ret = ip->i_flags & flags;
 378         if (!ret)
 379                 ip->i_flags |= flags;
 380         spin_unlock(&ip->i_flags_lock);
 381         return ret;
 382 }
 383
 384 /*
 385  * Project quota id helpers (previously projid was 16bit only
 386  * and using two 16bit values to hold new 32bit projid was chosen
 387  * to retain compatibility with "old" filesystems).
 388  */
 389 static inline prid_t
 390 xfs_get_projid(struct xfs_inode *ip)
 391 {
 392         return (prid_t)ip->i_d.di_projid_hi << 16 | ip->i_d.di_projid_lo;
 393 }
 394
 395 static inline void
 396 xfs_set_projid(struct xfs_inode *ip,
 397                 prid_t projid)
 398 {
 399         ip->i_d.di_projid_hi = (__uint16_t) (projid >> 16);
 400         ip->i_d.di_projid_lo = (__uint16_t) (projid & 0xffff);
 401 }
 402
 403 /*
 404  * In-core inode flags.
 405  */
 406 #define XFS_IRECLAIM            (1 << 0) /* started reclaiming this inode */
 407 #define XFS_ISTALE              (1 << 1) /* inode has been staled */
 408 #define XFS_IRECLAIMABLE        (1 << 2) /* inode can be reclaimed */
 409 #define XFS_INEW                (1 << 3) /* inode has just been allocated */
 410 #define XFS_IFILESTREAM         (1 << 4) /* inode is in a filestream dir. */
 411 #define XFS_ITRUNCATED          (1 << 5) /* truncated down so flush-on-close */
 412 #define XFS_IDIRTY_RELEASE      (1 << 6) /* dirty release already seen */
 413 #define __XFS_IFLOCK_BIT        7        /* inode is being flushed right now */
 414 #define XFS_IFLOCK              (1 << __XFS_IFLOCK_BIT)
 415 #define __XFS_IPINNED_BIT       8        /* wakeup key for zero pin count */
 416 #define XFS_IPINNED             (1 << __XFS_IPINNED_BIT)
 417 #define XFS_IDONTCACHE          (1 << 9) /* don't cache the inode long term */
 418
 419 /*
 420  * Per-lifetime flags need to be reset when re-using a reclaimable inode during
 421  * inode lookup. This prevents unintended behaviour on the new inode from
 422  * ocurring.
 423  */
 424 #define XFS_IRECLAIM_RESET_FLAGS        \
 425         (XFS_IRECLAIMABLE | XFS_IRECLAIM | \
 426          XFS_IDIRTY_RELEASE | XFS_ITRUNCATED | \
 427          XFS_IFILESTREAM);
 428
 429 /*
 430  * Synchronize processes attempting to flush the in-core inode back to disk.
 431  */
 432
 433 extern void __xfs_iflock(struct xfs_inode *ip);
 434
 435 static inline int xfs_iflock_nowait(struct xfs_inode *ip)
 436 {
 437         return !xfs_iflags_test_and_set(ip, XFS_IFLOCK);
 438 }
 439
 440 static inline void xfs_iflock(struct xfs_inode *ip)
 441 {
 442         if (!xfs_iflock_nowait(ip))
 443                 __xfs_iflock(ip);
 444 }
 445
 446 static inline void xfs_ifunlock(struct xfs_inode *ip)
 447 {
 448         xfs_iflags_clear(ip, XFS_IFLOCK);
 449         smp_mb();
 450         wake_up_bit(&ip->i_flags, __XFS_IFLOCK_BIT);
 451 }
 452
 453 static inline int xfs_isiflocked(struct xfs_inode *ip)
 454 {
 455         return xfs_iflags_test(ip, XFS_IFLOCK);
 456 }
 457
 458 /*
 459  * Flags for inode locking.
 460  * Bit ranges:  1<<1  - 1<<16-1 -- iolock/ilock modes (bitfield)
 461  *              1<<16 - 1<<32-1 -- lockdep annotation (integers)
 462  */
 463 #define XFS_IOLOCK_EXCL         (1<<0)
 464 #define XFS_IOLOCK_SHARED       (1<<1)
 465 #define XFS_ILOCK_EXCL          (1<<2)
 466 #define XFS_ILOCK_SHARED        (1<<3)
 467
 468 #define XFS_LOCK_MASK           (XFS_IOLOCK_EXCL | XFS_IOLOCK_SHARED \
 469                                 | XFS_ILOCK_EXCL | XFS_ILOCK_SHARED)
 470
 471 #define XFS_LOCK_FLAGS \
 472         { XFS_IOLOCK_EXCL,      "IOLOCK_EXCL" }, \
 473         { XFS_IOLOCK_SHARED,    "IOLOCK_SHARED" }, \
 474         { XFS_ILOCK_EXCL,       "ILOCK_EXCL" }, \
 475         { XFS_ILOCK_SHARED,     "ILOCK_SHARED" }
 476
 477
 478 /*
 479  * Flags for lockdep annotations.
 480  *
 481  * XFS_LOCK_PARENT - for directory operations that require locking a
 482  * parent directory inode and a child entry inode.  The parent gets locked
 483  * with this flag so it gets a lockdep subclass of 1 and the child entry
 484  * lock will have a lockdep subclass of 0.
 485  *
 486  * XFS_LOCK_RTBITMAP/XFS_LOCK_RTSUM - the realtime device bitmap and summary
 487  * inodes do not participate in the normal lock order, and thus have their
 488  * own subclasses.
 489  *
 490  * XFS_LOCK_INUMORDER - for locking several inodes at the some time
 491  * with xfs_lock_inodes().  This flag is used as the starting subclass
 492  * and each subsequent lock acquired will increment the subclass by one.
 493  * So the first lock acquired will have a lockdep subclass of 4, the
 494  * second lock will have a lockdep subclass of 5, and so on. It is
 495  * the responsibility of the class builder to shift this to the correct
 496  * portion of the lock_mode lockdep mask.
 497  */
 498 #define XFS_LOCK_PARENT         1
 499 #define XFS_LOCK_RTBITMAP       2
 500 #define XFS_LOCK_RTSUM          3
 501 #define XFS_LOCK_INUMORDER      4
 502
 503 #define XFS_IOLOCK_SHIFT        16
 504 #define XFS_IOLOCK_PARENT       (XFS_LOCK_PARENT << XFS_IOLOCK_SHIFT)
 505
 506 #define XFS_ILOCK_SHIFT         24
 507 #define XFS_ILOCK_PARENT        (XFS_LOCK_PARENT << XFS_ILOCK_SHIFT)
 508 #define XFS_ILOCK_RTBITMAP      (XFS_LOCK_RTBITMAP << XFS_ILOCK_SHIFT)
 509 #define XFS_ILOCK_RTSUM         (XFS_LOCK_RTSUM << XFS_ILOCK_SHIFT)
 510
 511 #define XFS_IOLOCK_DEP_MASK     0x00ff0000
 512 #define XFS_ILOCK_DEP_MASK      0xff000000
 513 #define XFS_LOCK_DEP_MASK       (XFS_IOLOCK_DEP_MASK | XFS_ILOCK_DEP_MASK)
 514
 515 #define XFS_IOLOCK_DEP(flags)   (((flags) & XFS_IOLOCK_DEP_MASK) >> XFS_IOLOCK_SHIFT)
 516 #define XFS_ILOCK_DEP(flags)    (((flags) & XFS_ILOCK_DEP_MASK) >> XFS_ILOCK_SHIFT)
 517
 518 /*
 519  * For multiple groups support: if S_ISGID bit is set in the parent
 520  * directory, group of new file is set to that of the parent, and
 521  * new subdirectory gets S_ISGID bit from parent.
 522  */
 523 #define XFS_INHERIT_GID(pip)    \
 524         (((pip)->i_mount->m_flags & XFS_MOUNT_GRPID) || \
 525          ((pip)->i_d.di_mode & S_ISGID))
 526
 527
 528 /*
 529  * xfs_inode.c prototypes.
 530  */
 531 void            xfs_ilock(xfs_inode_t *, uint);
 532 int             xfs_ilock_nowait(xfs_inode_t *, uint);
 533 void            xfs_iunlock(xfs_inode_t *, uint);
 534 void            xfs_ilock_demote(xfs_inode_t *, uint);
 535 int             xfs_isilocked(xfs_inode_t *, uint);
 536 uint            xfs_ilock_map_shared(xfs_inode_t *);
 537 void            xfs_iunlock_map_shared(xfs_inode_t *, uint);
 538 int             xfs_ialloc(struct xfs_trans *, xfs_inode_t *, umode_t,
 539                            xfs_nlink_t, xfs_dev_t, prid_t, int,
 540                            struct xfs_buf **, xfs_inode_t **);
 541
 542 uint            xfs_ip2xflags(struct xfs_inode *);
 543 uint            xfs_dic2xflags(struct xfs_dinode *);
 544 int             xfs_ifree(struct xfs_trans *, xfs_inode_t *,
 545                            struct xfs_bmap_free *);
 546 int             xfs_itruncate_extents(struct xfs_trans **, struct xfs_inode *,
 547                                       int, xfs_fsize_t);
 548 int             xfs_iunlink(struct xfs_trans *, xfs_inode_t *);
 549
 550 void            xfs_iext_realloc(xfs_inode_t *, int, int);
 551 void            xfs_iunpin_wait(xfs_inode_t *);
 552 int             xfs_iflush(struct xfs_inode *, struct xfs_buf **);
 553 void            xfs_lock_inodes(xfs_inode_t **, int, uint);
 554 void            xfs_lock_two_inodes(xfs_inode_t *, xfs_inode_t *, uint);
 555
 556 xfs_extlen_t    xfs_get_extsz_hint(struct xfs_inode *ip);
 557
 558 #define IHOLD(ip) \
 559 do { \
 560         ASSERT(atomic_read(&VFS_I(ip)->i_count) > 0) ; \
 561         ihold(VFS_I(ip)); \
 562         trace_xfs_ihold(ip, _THIS_IP_); \
 563 } while (0)
 564
 565 #define IRELE(ip) \
 566 do { \
 567         trace_xfs_irele(ip, _THIS_IP_); \
 568         iput(VFS_I(ip)); \
 569 } while (0)
 570
 571 #endif /* __KERNEL__ */
 572
 573 /*
 574  * Flags for xfs_iget()
 575  */
 576 #define XFS_IGET_CREATE         0x1
 577 #define XFS_IGET_UNTRUSTED      0x2
 578 #define XFS_IGET_DONTCACHE      0x4
 579
 580 int             xfs_imap_to_bp(struct xfs_mount *, struct xfs_trans *,
 581                                struct xfs_imap *, struct xfs_dinode **,
 582                                struct xfs_buf **, uint, uint);
 583 int             xfs_iread(struct xfs_mount *, struct xfs_trans *,
 584                           struct xfs_inode *, uint);
 585 void            xfs_dinode_calc_crc(struct xfs_mount *, struct xfs_dinode *);
 586 void            xfs_dinode_to_disk(struct xfs_dinode *,
 587                                    struct xfs_icdinode *);
 588 void            xfs_idestroy_fork(struct xfs_inode *, int);
 589 void            xfs_idata_realloc(struct xfs_inode *, int, int);
 590 void            xfs_iroot_realloc(struct xfs_inode *, int, int);
 591 int             xfs_iread_extents(struct xfs_trans *, struct xfs_inode *, int);
 592 int             xfs_iextents_copy(struct xfs_inode *, xfs_bmbt_rec_t *, int);
 593
 594 xfs_bmbt_rec_host_t *xfs_iext_get_ext(xfs_ifork_t *, xfs_extnum_t);
 595 void            xfs_iext_insert(xfs_inode_t *, xfs_extnum_t, xfs_extnum_t,
 596                                 xfs_bmbt_irec_t *, int);
 597 void            xfs_iext_add(xfs_ifork_t *, xfs_extnum_t, int);
 598 void            xfs_iext_add_indirect_multi(xfs_ifork_t *, int, xfs_extnum_t, int);
 599 void            xfs_iext_remove(xfs_inode_t *, xfs_extnum_t, int, int);
 600 void            xfs_iext_remove_inline(xfs_ifork_t *, xfs_extnum_t, int);
 601 void            xfs_iext_remove_direct(xfs_ifork_t *, xfs_extnum_t, int);
 602 void            xfs_iext_remove_indirect(xfs_ifork_t *, xfs_extnum_t, int);
 603 void            xfs_iext_realloc_direct(xfs_ifork_t *, int);
 604 void            xfs_iext_direct_to_inline(xfs_ifork_t *, xfs_extnum_t);
 605 void            xfs_iext_inline_to_direct(xfs_ifork_t *, int);
 606 void            xfs_iext_destroy(xfs_ifork_t *);
 607 xfs_bmbt_rec_host_t *xfs_iext_bno_to_ext(xfs_ifork_t *, xfs_fileoff_t, int *);
 608 xfs_ext_irec_t  *xfs_iext_bno_to_irec(xfs_ifork_t *, xfs_fileoff_t, int *);
 609 xfs_ext_irec_t  *xfs_iext_idx_to_irec(xfs_ifork_t *, xfs_extnum_t *, int *, int);
 610 void            xfs_iext_irec_init(xfs_ifork_t *);
 611 xfs_ext_irec_t *xfs_iext_irec_new(xfs_ifork_t *, int);
 612 void            xfs_iext_irec_remove(xfs_ifork_t *, int);
 613 void            xfs_iext_irec_compact(xfs_ifork_t *);
 614 void            xfs_iext_irec_compact_pages(xfs_ifork_t *);
 615 void            xfs_iext_irec_compact_full(xfs_ifork_t *);
 616 void            xfs_iext_irec_update_extoffs(xfs_ifork_t *, int, int);
 617 bool            xfs_can_free_eofblocks(struct xfs_inode *, bool);
 618
 619 #define xfs_ipincount(ip)       ((unsigned int) atomic_read(&ip->i_pincount))
 620
 621 #if defined(DEBUG)
 622 void            xfs_inobp_check(struct xfs_mount *, struct xfs_buf *);
 623 #else
 624 #define xfs_inobp_check(mp, bp)
 625 #endif /* DEBUG */
 626
 627 extern struct kmem_zone *xfs_ifork_zone;
 628 extern struct kmem_zone *xfs_inode_zone;
 629 extern struct kmem_zone *xfs_ili_zone;
 630 extern const struct xfs_buf_ops xfs_inode_buf_ops;
 631
 632 #endif  /* __XFS_INODE_H__ */