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 /*
  22  * Fork identifiers.
  23  */
  24 #define XFS_DATA_FORK   0
  25 #define XFS_ATTR_FORK   1
  26
  27 /*
  28  * File incore extent information, present for each of data & attr forks.
  29  */
  30 #define XFS_INLINE_EXTS 2
  31 #define XFS_INLINE_DATA 32
  32 typedef struct xfs_ifork {
  33         int                     if_bytes;       /* bytes in if_u1 */
  34         int                     if_real_bytes;  /* bytes allocated in if_u1 */
  35         xfs_bmbt_block_t        *if_broot;      /* file's incore btree root */
  36         short                   if_broot_bytes; /* bytes allocated for root */
  37         unsigned char           if_flags;       /* per-fork flags */
  38         unsigned char           if_ext_max;     /* max # of extent records */
  39         xfs_extnum_t            if_lastex;      /* last if_extents used */
  40         union {
  41                 xfs_bmbt_rec_t  *if_extents;    /* linear map file exts */
  42                 char            *if_data;       /* inline file data */
  43         } if_u1;
  44         union {
  45                 xfs_bmbt_rec_t  if_inline_ext[XFS_INLINE_EXTS];
  46                                                 /* very small file extents */
  47                 char            if_inline_data[XFS_INLINE_DATA];
  48                                                 /* very small file data */
  49                 xfs_dev_t       if_rdev;        /* dev number if special */
  50                 uuid_t          if_uuid;        /* mount point value */
  51         } if_u2;
  52 } xfs_ifork_t;
  53
  54 /*
  55  * Flags for xfs_ichgtime().
  56  */
  57 #define XFS_ICHGTIME_MOD        0x1     /* data fork modification timestamp */
  58 #define XFS_ICHGTIME_ACC        0x2     /* data fork access timestamp */
  59 #define XFS_ICHGTIME_CHG        0x4     /* inode field change timestamp */
  60
  61 /*
  62  * Per-fork incore inode flags.
  63  */
  64 #define XFS_IFINLINE    0x0001  /* Inline data is read in */
  65 #define XFS_IFEXTENTS   0x0002  /* All extent pointers are read in */
  66 #define XFS_IFBROOT     0x0004  /* i_broot points to the bmap b-tree root */
  67
  68 /*
  69  * Flags for xfs_imap() and xfs_dilocate().
  70  */
  71 #define XFS_IMAP_LOOKUP         0x1
  72
  73 /*
  74  * Maximum number of extent pointers in if_u1.if_extents.
  75  */
  76 #define XFS_MAX_INCORE_EXTENTS  32768
  77
  78
  79 #ifdef __KERNEL__
  80 struct bhv_desc;
  81 struct cred;
  82 struct ktrace;
  83 struct vnode;
  84 struct xfs_buf;
  85 struct xfs_bmap_free;
  86 struct xfs_bmbt_irec;
  87 struct xfs_bmbt_block;
  88 struct xfs_inode;
  89 struct xfs_inode_log_item;
  90 struct xfs_mount;
  91 struct xfs_trans;
  92 struct xfs_dquot;
  93
  94 #if defined(XFS_ILOCK_TRACE)
  95 #define XFS_ILOCK_KTRACE_SIZE   32
  96 extern ktrace_t *xfs_ilock_trace_buf;
  97 extern void xfs_ilock_trace(struct xfs_inode *, int, unsigned int, inst_t *);
  98 #else
  99 #define xfs_ilock_trace(i,n,f,ra)
 100 #endif
 101
 102 typedef struct dm_attrs_s {
 103         __uint32_t      da_dmevmask;    /* DMIG event mask */
 104         __uint16_t      da_dmstate;     /* DMIG state info */
 105         __uint16_t      da_pad;         /* DMIG extra padding */
 106 } dm_attrs_t;
 107
 108 typedef struct xfs_iocore {
 109         void                    *io_obj;        /* pointer to container
 110                                                  * inode or dcxvn structure */
 111         struct xfs_mount        *io_mount;      /* fs mount struct ptr */
 112 #ifdef DEBUG
 113         mrlock_t                *io_lock;       /* inode IO lock */
 114         mrlock_t                *io_iolock;     /* inode IO lock */
 115 #endif
 116
 117         /* I/O state */
 118         xfs_fsize_t             io_new_size;    /* sz when write completes */
 119
 120         /* Miscellaneous state. */
 121         unsigned int            io_flags;       /* IO related flags */
 122
 123         /* DMAPI state */
 124         dm_attrs_t              io_dmattrs;
 125
 126 } xfs_iocore_t;
 127
 128 #define        io_dmevmask     io_dmattrs.da_dmevmask
 129 #define        io_dmstate      io_dmattrs.da_dmstate
 130
 131 #define XFS_IO_INODE(io)        ((xfs_inode_t *) ((io)->io_obj))
 132 #define XFS_IO_DCXVN(io)        ((dcxvn_t *) ((io)->io_obj))
 133
 134 /*
 135  * Flags in the flags field
 136  */
 137
 138 #define XFS_IOCORE_RT           0x1
 139
 140 /*
 141  * xfs_iocore prototypes
 142  */
 143
 144 extern void xfs_iocore_inode_init(struct xfs_inode *);
 145 extern void xfs_iocore_inode_reinit(struct xfs_inode *);
 146
 147
 148 /*
 149  * This is the type used in the xfs inode hash table.
 150  * An array of these is allocated for each mounted
 151  * file system to hash the inodes for that file system.
 152  */
 153 typedef struct xfs_ihash {
 154         struct xfs_inode        *ih_next;
 155         rwlock_t                ih_lock;
 156         uint                    ih_version;
 157 } xfs_ihash_t;
 158
 159 #define XFS_IHASH(mp,ino) ((mp)->m_ihash + (((uint)(ino)) % (mp)->m_ihsize))
 160
 161 /*
 162  * This is the xfs inode cluster hash.  This hash is used by xfs_iflush to
 163  * find inodes that share a cluster and can be flushed to disk at the same
 164  * time.
 165  */
 166 typedef struct xfs_chashlist {
 167         struct xfs_chashlist    *chl_next;
 168         struct xfs_inode        *chl_ip;
 169         xfs_daddr_t             chl_blkno;      /* starting block number of
 170                                                  * the cluster */
 171         struct xfs_buf          *chl_buf;       /* the inode buffer */
 172 } xfs_chashlist_t;
 173
 174 typedef struct xfs_chash {
 175         xfs_chashlist_t         *ch_list;
 176         lock_t                  ch_lock;
 177 } xfs_chash_t;
 178
 179 #define XFS_CHASH(mp,blk) ((mp)->m_chash + (((uint)blk) % (mp)->m_chsize))
 180
 181
 182 /*
 183  * This is the xfs in-core inode structure.
 184  * Most of the on-disk inode is embedded in the i_d field.
 185  *
 186  * The extent pointers/inline file space, however, are managed
 187  * separately.  The memory for this information is pointed to by
 188  * the if_u1 unions depending on the type of the data.
 189  * This is used to linearize the array of extents for fast in-core
 190  * access.  This is used until the file's number of extents
 191  * surpasses XFS_MAX_INCORE_EXTENTS, at which point all extent pointers
 192  * are accessed through the buffer cache.
 193  *
 194  * Other state kept in the in-core inode is used for identification,
 195  * locking, transactional updating, etc of the inode.
 196  *
 197  * Generally, we do not want to hold the i_rlock while holding the
 198  * i_ilock. Hierarchy is i_iolock followed by i_rlock.
 199  *
 200  * xfs_iptr_t contains all the inode fields upto and including the
 201  * i_mnext and i_mprev fields, it is used as a marker in the inode
 202  * chain off the mount structure by xfs_sync calls.
 203  */
 204
 205 typedef struct {
 206         struct xfs_ihash        *ip_hash;       /* pointer to hash header */
 207         struct xfs_inode        *ip_next;       /* inode hash link forw */
 208         struct xfs_inode        *ip_mnext;      /* next inode in mount list */
 209         struct xfs_inode        *ip_mprev;      /* ptr to prev inode */
 210         struct xfs_inode        **ip_prevp;     /* ptr to prev i_next */
 211         struct xfs_mount        *ip_mount;      /* fs mount struct ptr */
 212 } xfs_iptr_t;
 213
 214 typedef struct xfs_inode {
 215         /* Inode linking and identification information. */
 216         struct xfs_ihash        *i_hash;        /* pointer to hash header */
 217         struct xfs_inode        *i_next;        /* inode hash link forw */
 218         struct xfs_inode        *i_mnext;       /* next inode in mount list */
 219         struct xfs_inode        *i_mprev;       /* ptr to prev inode */
 220         struct xfs_inode        **i_prevp;      /* ptr to prev i_next */
 221         struct xfs_mount        *i_mount;       /* fs mount struct ptr */
 222         struct list_head        i_reclaim;      /* reclaim list */
 223         struct bhv_desc         i_bhv_desc;     /* inode behavior descriptor*/
 224         struct xfs_dquot        *i_udquot;      /* user dquot */
 225         struct xfs_dquot        *i_gdquot;      /* group dquot */
 226
 227         /* Inode location stuff */
 228         xfs_ino_t               i_ino;          /* inode number (agno/agino)*/
 229         xfs_daddr_t             i_blkno;        /* blkno of inode buffer */
 230         ushort                  i_len;          /* len of inode buffer */
 231         ushort                  i_boffset;      /* off of inode in buffer */
 232
 233         /* Extent information. */
 234         xfs_ifork_t             *i_afp;         /* attribute fork pointer */
 235         xfs_ifork_t             i_df;           /* data fork */
 236
 237         /* Transaction and locking information. */
 238         struct xfs_trans        *i_transp;      /* ptr to owning transaction*/
 239         struct xfs_inode_log_item *i_itemp;     /* logging information */
 240         mrlock_t                i_lock;         /* inode lock */
 241         mrlock_t                i_iolock;       /* inode IO lock */
 242         sema_t                  i_flock;        /* inode flush lock */
 243         atomic_t                i_pincount;     /* inode pin count */
 244         wait_queue_head_t       i_ipin_wait;    /* inode pinning wait queue */
 245 #ifdef HAVE_REFCACHE
 246         struct xfs_inode        **i_refcache;   /* ptr to entry in ref cache */
 247         struct xfs_inode        *i_release;     /* inode to unref */
 248 #endif
 249         /* I/O state */
 250         xfs_iocore_t            i_iocore;       /* I/O core */
 251
 252         /* Miscellaneous state. */
 253         unsigned short          i_flags;        /* see defined flags below */
 254         unsigned char           i_update_core;  /* timestamps/size is dirty */
 255         unsigned char           i_update_size;  /* di_size field is dirty */
 256         unsigned int            i_gen;          /* generation count */
 257         unsigned int            i_delayed_blks; /* count of delay alloc blks */
 258
 259         xfs_dinode_core_t       i_d;            /* most of ondisk inode */
 260         xfs_chashlist_t         *i_chash;       /* cluster hash list header */
 261         struct xfs_inode        *i_cnext;       /* cluster hash link forward */
 262         struct xfs_inode        *i_cprev;       /* cluster hash link backward */
 263
 264         /* Trace buffers per inode. */
 265 #ifdef XFS_BMAP_TRACE
 266         struct ktrace           *i_xtrace;      /* inode extent list trace */
 267 #endif
 268 #ifdef XFS_BMBT_TRACE
 269         struct ktrace           *i_btrace;      /* inode bmap btree trace */
 270 #endif
 271 #ifdef XFS_RW_TRACE
 272         struct ktrace           *i_rwtrace;     /* inode read/write trace */
 273 #endif
 274 #ifdef XFS_ILOCK_TRACE
 275         struct ktrace           *i_lock_trace;  /* inode lock/unlock trace */
 276 #endif
 277 #ifdef XFS_DIR2_TRACE
 278         struct ktrace           *i_dir_trace;   /* inode directory trace */
 279 #endif
 280 } xfs_inode_t;
 281
 282 #endif  /* __KERNEL__ */
 283
 284
 285 /*
 286  * Fork handling.
 287  */
 288 #define XFS_IFORK_PTR(ip,w)             \
 289         ((w) == XFS_DATA_FORK ? &(ip)->i_df : (ip)->i_afp)
 290 #define XFS_IFORK_Q(ip)                 XFS_CFORK_Q(&(ip)->i_d)
 291 #define XFS_IFORK_DSIZE(ip)             XFS_CFORK_DSIZE(&ip->i_d, ip->i_mount)
 292 #define XFS_IFORK_ASIZE(ip)             XFS_CFORK_ASIZE(&ip->i_d, ip->i_mount)
 293 #define XFS_IFORK_SIZE(ip,w)            XFS_CFORK_SIZE(&ip->i_d, ip->i_mount, w)
 294 #define XFS_IFORK_FORMAT(ip,w)          XFS_CFORK_FORMAT(&ip->i_d, w)
 295 #define XFS_IFORK_FMT_SET(ip,w,n)       XFS_CFORK_FMT_SET(&ip->i_d, w, n)
 296 #define XFS_IFORK_NEXTENTS(ip,w)        XFS_CFORK_NEXTENTS(&ip->i_d, w)
 297 #define XFS_IFORK_NEXT_SET(ip,w,n)      XFS_CFORK_NEXT_SET(&ip->i_d, w, n)
 298
 299
 300 #ifdef __KERNEL__
 301
 302 /*
 303  * In-core inode flags.
 304  */
 305 #define XFS_IGRIO       0x0001  /* inode used for guaranteed rate i/o */
 306 #define XFS_IUIOSZ      0x0002  /* inode i/o sizes have been explicitly set */
 307 #define XFS_IQUIESCE    0x0004  /* we have started quiescing for this inode */
 308 #define XFS_IRECLAIM    0x0008  /* we have started reclaiming this inode    */
 309 #define XFS_ISTALE      0x0010  /* inode has been staled */
 310 #define XFS_IRECLAIMABLE 0x0020 /* inode can be reclaimed */
 311 #define XFS_INEW        0x0040
 312
 313 /*
 314  * Flags for inode locking.
 315  */
 316 #define XFS_IOLOCK_EXCL         0x001
 317 #define XFS_IOLOCK_SHARED       0x002
 318 #define XFS_ILOCK_EXCL          0x004
 319 #define XFS_ILOCK_SHARED        0x008
 320 #define XFS_IUNLOCK_NONOTIFY    0x010
 321 /*      XFS_IOLOCK_NESTED       0x020 */
 322 #define XFS_EXTENT_TOKEN_RD     0x040
 323 #define XFS_SIZE_TOKEN_RD       0x080
 324 #define XFS_EXTSIZE_RD          (XFS_EXTENT_TOKEN_RD|XFS_SIZE_TOKEN_RD)
 325 #define XFS_WILLLEND            0x100   /* Always acquire tokens for lending */
 326 #define XFS_EXTENT_TOKEN_WR     (XFS_EXTENT_TOKEN_RD | XFS_WILLLEND)
 327 #define XFS_SIZE_TOKEN_WR       (XFS_SIZE_TOKEN_RD | XFS_WILLLEND)
 328 #define XFS_EXTSIZE_WR          (XFS_EXTSIZE_RD | XFS_WILLLEND)
 329 /*      XFS_SIZE_TOKEN_WANT     0x200 */
 330
 331 #define XFS_LOCK_MASK   \
 332         (XFS_IOLOCK_EXCL | XFS_IOLOCK_SHARED | XFS_ILOCK_EXCL | \
 333          XFS_ILOCK_SHARED | XFS_EXTENT_TOKEN_RD | XFS_SIZE_TOKEN_RD | \
 334          XFS_WILLLEND)
 335
 336 /*
 337  * Flags for xfs_iflush()
 338  */
 339 #define XFS_IFLUSH_DELWRI_ELSE_SYNC     1
 340 #define XFS_IFLUSH_DELWRI_ELSE_ASYNC    2
 341 #define XFS_IFLUSH_SYNC                 3
 342 #define XFS_IFLUSH_ASYNC                4
 343 #define XFS_IFLUSH_DELWRI               5
 344
 345 /*
 346  * Flags for xfs_itruncate_start().
 347  */
 348 #define XFS_ITRUNC_DEFINITE     0x1
 349 #define XFS_ITRUNC_MAYBE        0x2
 350
 351 #define XFS_ITOV(ip)            BHV_TO_VNODE(XFS_ITOBHV(ip))
 352 #define XFS_ITOV_NULL(ip)       BHV_TO_VNODE_NULL(XFS_ITOBHV(ip))
 353 #define XFS_ITOBHV(ip)          ((struct bhv_desc *)(&((ip)->i_bhv_desc)))
 354 #define XFS_BHVTOI(bhvp)        ((xfs_inode_t *)((char *)(bhvp) - \
 355                                 (char *)&(((xfs_inode_t *)0)->i_bhv_desc)))
 356 #define BHV_IS_XFS(bdp)         (BHV_OPS(bdp) == &xfs_vnodeops)
 357
 358 /*
 359  * For multiple groups support: if S_ISGID bit is set in the parent
 360  * directory, group of new file is set to that of the parent, and
 361  * new subdirectory gets S_ISGID bit from parent.
 362  */
 363 #define XFS_INHERIT_GID(pip, vfsp)      \
 364         (((vfsp)->vfs_flag & VFS_GRPID) || ((pip)->i_d.di_mode & S_ISGID))
 365
 366 /*
 367  * xfs_iget.c prototypes.
 368  */
 369
 370 #define IGET_CREATE     1
 371
 372 void            xfs_ihash_init(struct xfs_mount *);
 373 void            xfs_ihash_free(struct xfs_mount *);
 374 void            xfs_chash_init(struct xfs_mount *);
 375 void            xfs_chash_free(struct xfs_mount *);
 376 xfs_inode_t     *xfs_inode_incore(struct xfs_mount *, xfs_ino_t,
 377                                   struct xfs_trans *);
 378 void            xfs_inode_lock_init(xfs_inode_t *, struct vnode *);
 379 int             xfs_iget(struct xfs_mount *, struct xfs_trans *, xfs_ino_t,
 380                          uint, uint, xfs_inode_t **, xfs_daddr_t);
 381 void            xfs_iput(xfs_inode_t *, uint);
 382 void            xfs_iput_new(xfs_inode_t *, uint);
 383 void            xfs_ilock(xfs_inode_t *, uint);
 384 int             xfs_ilock_nowait(xfs_inode_t *, uint);
 385 void            xfs_iunlock(xfs_inode_t *, uint);
 386 void            xfs_ilock_demote(xfs_inode_t *, uint);
 387 void            xfs_iflock(xfs_inode_t *);
 388 int             xfs_iflock_nowait(xfs_inode_t *);
 389 uint            xfs_ilock_map_shared(xfs_inode_t *);
 390 void            xfs_iunlock_map_shared(xfs_inode_t *, uint);
 391 void            xfs_ifunlock(xfs_inode_t *);
 392 void            xfs_ireclaim(xfs_inode_t *);
 393 int             xfs_finish_reclaim(xfs_inode_t *, int, int);
 394 int             xfs_finish_reclaim_all(struct xfs_mount *, int);
 395
 396 /*
 397  * xfs_inode.c prototypes.
 398  */
 399 int             xfs_itobp(struct xfs_mount *, struct xfs_trans *,
 400                           xfs_inode_t *, xfs_dinode_t **, struct xfs_buf **,
 401                           xfs_daddr_t);
 402 int             xfs_iread(struct xfs_mount *, struct xfs_trans *, xfs_ino_t,
 403                           xfs_inode_t **, xfs_daddr_t);
 404 int             xfs_iread_extents(struct xfs_trans *, xfs_inode_t *, int);
 405 int             xfs_ialloc(struct xfs_trans *, xfs_inode_t *, mode_t,
 406                            xfs_nlink_t, xfs_dev_t, struct cred *, xfs_prid_t,
 407                            int, struct xfs_buf **, boolean_t *, xfs_inode_t **);
 408 void            xfs_xlate_dinode_core(xfs_caddr_t, struct xfs_dinode_core *,
 409                                         int);
 410 uint            xfs_ip2xflags(struct xfs_inode *);
 411 uint            xfs_dic2xflags(struct xfs_dinode_core *);
 412 int             xfs_ifree(struct xfs_trans *, xfs_inode_t *,
 413                            struct xfs_bmap_free *);
 414 void            xfs_itruncate_start(xfs_inode_t *, uint, xfs_fsize_t);
 415 int             xfs_itruncate_finish(struct xfs_trans **, xfs_inode_t *,
 416                                      xfs_fsize_t, int, int);
 417 int             xfs_iunlink(struct xfs_trans *, xfs_inode_t *);
 418 int             xfs_igrow_start(xfs_inode_t *, xfs_fsize_t, struct cred *);
 419 void            xfs_igrow_finish(struct xfs_trans *, xfs_inode_t *,
 420                                  xfs_fsize_t, int);
 421
 422 void            xfs_idestroy_fork(xfs_inode_t *, int);
 423 void            xfs_idestroy(xfs_inode_t *);
 424 void            xfs_idata_realloc(xfs_inode_t *, int, int);
 425 void            xfs_iextract(xfs_inode_t *);
 426 void            xfs_iext_realloc(xfs_inode_t *, int, int);
 427 void            xfs_iroot_realloc(xfs_inode_t *, int, int);
 428 void            xfs_ipin(xfs_inode_t *);
 429 void            xfs_iunpin(xfs_inode_t *);
 430 int             xfs_iextents_copy(xfs_inode_t *, xfs_bmbt_rec_t *, int);
 431 int             xfs_iflush(xfs_inode_t *, uint);
 432 void            xfs_iflush_all(struct xfs_mount *);
 433 int             xfs_iaccess(xfs_inode_t *, mode_t, cred_t *);
 434 uint            xfs_iroundup(uint);
 435 void            xfs_ichgtime(xfs_inode_t *, int);
 436 xfs_fsize_t     xfs_file_last_byte(xfs_inode_t *);
 437 void            xfs_lock_inodes(xfs_inode_t **, int, int, uint);
 438
 439 #define xfs_ipincount(ip)       ((unsigned int) atomic_read(&ip->i_pincount))
 440
 441 #ifdef DEBUG
 442 void            xfs_isize_check(struct xfs_mount *, xfs_inode_t *, xfs_fsize_t);
 443 #else   /* DEBUG */
 444 #define xfs_isize_check(mp, ip, isize)
 445 #endif  /* DEBUG */
 446
 447 #if defined(DEBUG)
 448 void            xfs_inobp_check(struct xfs_mount *, struct xfs_buf *);
 449 #else
 450 #define xfs_inobp_check(mp, bp)
 451 #endif /* DEBUG */
 452
 453 extern struct kmem_zone *xfs_chashlist_zone;
 454 extern struct kmem_zone *xfs_ifork_zone;
 455 extern struct kmem_zone *xfs_inode_zone;
 456 extern struct kmem_zone *xfs_ili_zone;
 457 extern struct vnodeops  xfs_vnodeops;
 458
 459 #endif  /* __KERNEL__ */
 460
 461 #endif  /* __XFS_INODE_H__ */