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 #include "xfs_inode_buf.h"
  22 #include "xfs_inode_fork.h"
  23
  24 /*
  25  * Kernel only inode definitions
  26  */
  27 struct xfs_dinode;
  28 struct xfs_inode;
  29 struct xfs_buf;
  30 struct xfs_bmap_free;
  31 struct xfs_bmbt_irec;
  32 struct xfs_inode_log_item;
  33 struct xfs_mount;
  34 struct xfs_trans;
  35 struct xfs_dquot;
  36
  37 typedef struct xfs_inode {
  38         /* Inode linking and identification information. */
  39         struct xfs_mount        *i_mount;       /* fs mount struct ptr */
  40         struct xfs_dquot        *i_udquot;      /* user dquot */
  41         struct xfs_dquot        *i_gdquot;      /* group dquot */
  42         struct xfs_dquot        *i_pdquot;      /* project dquot */
  43
  44         /* Inode location stuff */
  45         xfs_ino_t               i_ino;          /* inode number (agno/agino)*/
  46         struct xfs_imap         i_imap;         /* location for xfs_imap() */
  47
  48         /* Extent information. */
  49         xfs_ifork_t             *i_afp;         /* attribute fork pointer */
  50         xfs_ifork_t             i_df;           /* data fork */
  51
  52         /* operations vectors */
  53         const struct xfs_dir_ops *d_ops;                /* directory ops vector */
  54
  55         /* Transaction and locking information. */
  56         struct xfs_inode_log_item *i_itemp;     /* logging information */
  57         mrlock_t                i_lock;         /* inode lock */
  58         mrlock_t                i_iolock;       /* inode IO lock */
  59         mrlock_t                i_mmaplock;     /* inode mmap IO lock */
  60         atomic_t                i_pincount;     /* inode pin count */
  61         spinlock_t              i_flags_lock;   /* inode i_flags lock */
  62         /* Miscellaneous state. */
  63         unsigned long           i_flags;        /* see defined flags below */
  64         unsigned int            i_delayed_blks; /* count of delay alloc blks */
  65
  66         struct xfs_icdinode     i_d;            /* most of ondisk inode */
  67
  68         /* VFS inode */
  69         struct inode            i_vnode;        /* embedded VFS inode */
  70 } xfs_inode_t;
  71
  72 /* Convert from vfs inode to xfs inode */
  73 static inline struct xfs_inode *XFS_I(struct inode *inode)
  74 {
  75         return container_of(inode, struct xfs_inode, i_vnode);
  76 }
  77
  78 /* convert from xfs inode to vfs inode */
  79 static inline struct inode *VFS_I(struct xfs_inode *ip)
  80 {
  81         return &ip->i_vnode;
  82 }
  83
  84 /*
  85  * For regular files we only update the on-disk filesize when actually
  86  * writing data back to disk.  Until then only the copy in the VFS inode
  87  * is uptodate.
  88  */
  89 static inline xfs_fsize_t XFS_ISIZE(struct xfs_inode *ip)
  90 {
  91         if (S_ISREG(VFS_I(ip)->i_mode))
  92                 return i_size_read(VFS_I(ip));
  93         return ip->i_d.di_size;
  94 }
  95
  96 /*
  97  * If this I/O goes past the on-disk inode size update it unless it would
  98  * be past the current in-core inode size.
  99  */
 100 static inline xfs_fsize_t
 101 xfs_new_eof(struct xfs_inode *ip, xfs_fsize_t new_size)
 102 {
 103         xfs_fsize_t i_size = i_size_read(VFS_I(ip));
 104
 105         if (new_size > i_size || new_size < 0)
 106                 new_size = i_size;
 107         return new_size > ip->i_d.di_size ? new_size : 0;
 108 }
 109
 110 /*
 111  * i_flags helper functions
 112  */
 113 static inline void
 114 __xfs_iflags_set(xfs_inode_t *ip, unsigned short flags)
 115 {
 116         ip->i_flags |= flags;
 117 }
 118
 119 static inline void
 120 xfs_iflags_set(xfs_inode_t *ip, unsigned short flags)
 121 {
 122         spin_lock(&ip->i_flags_lock);
 123         __xfs_iflags_set(ip, flags);
 124         spin_unlock(&ip->i_flags_lock);
 125 }
 126
 127 static inline void
 128 xfs_iflags_clear(xfs_inode_t *ip, unsigned short flags)
 129 {
 130         spin_lock(&ip->i_flags_lock);
 131         ip->i_flags &= ~flags;
 132         spin_unlock(&ip->i_flags_lock);
 133 }
 134
 135 static inline int
 136 __xfs_iflags_test(xfs_inode_t *ip, unsigned short flags)
 137 {
 138         return (ip->i_flags & flags);
 139 }
 140
 141 static inline int
 142 xfs_iflags_test(xfs_inode_t *ip, unsigned short flags)
 143 {
 144         int ret;
 145         spin_lock(&ip->i_flags_lock);
 146         ret = __xfs_iflags_test(ip, flags);
 147         spin_unlock(&ip->i_flags_lock);
 148         return ret;
 149 }
 150
 151 static inline int
 152 xfs_iflags_test_and_clear(xfs_inode_t *ip, unsigned short flags)
 153 {
 154         int ret;
 155
 156         spin_lock(&ip->i_flags_lock);
 157         ret = ip->i_flags & flags;
 158         if (ret)
 159                 ip->i_flags &= ~flags;
 160         spin_unlock(&ip->i_flags_lock);
 161         return ret;
 162 }
 163
 164 static inline int
 165 xfs_iflags_test_and_set(xfs_inode_t *ip, unsigned short flags)
 166 {
 167         int ret;
 168
 169         spin_lock(&ip->i_flags_lock);
 170         ret = ip->i_flags & flags;
 171         if (!ret)
 172                 ip->i_flags |= flags;
 173         spin_unlock(&ip->i_flags_lock);
 174         return ret;
 175 }
 176
 177 /*
 178  * Project quota id helpers (previously projid was 16bit only
 179  * and using two 16bit values to hold new 32bit projid was chosen
 180  * to retain compatibility with "old" filesystems).
 181  */
 182 static inline prid_t
 183 xfs_get_projid(struct xfs_inode *ip)
 184 {
 185         return (prid_t)ip->i_d.di_projid_hi << 16 | ip->i_d.di_projid_lo;
 186 }
 187
 188 static inline void
 189 xfs_set_projid(struct xfs_inode *ip,
 190                 prid_t projid)
 191 {
 192         ip->i_d.di_projid_hi = (__uint16_t) (projid >> 16);
 193         ip->i_d.di_projid_lo = (__uint16_t) (projid & 0xffff);
 194 }
 195
 196 static inline prid_t
 197 xfs_get_initial_prid(struct xfs_inode *dp)
 198 {
 199         if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
 200                 return xfs_get_projid(dp);
 201
 202         return XFS_PROJID_DEFAULT;
 203 }
 204
 205 /*
 206  * In-core inode flags.
 207  */
 208 #define XFS_IRECLAIM            (1 << 0) /* started reclaiming this inode */
 209 #define XFS_ISTALE              (1 << 1) /* inode has been staled */
 210 #define XFS_IRECLAIMABLE        (1 << 2) /* inode can be reclaimed */
 211 #define XFS_INEW                (1 << 3) /* inode has just been allocated */
 212 #define XFS_ITRUNCATED          (1 << 5) /* truncated down so flush-on-close */
 213 #define XFS_IDIRTY_RELEASE      (1 << 6) /* dirty release already seen */
 214 #define __XFS_IFLOCK_BIT        7        /* inode is being flushed right now */
 215 #define XFS_IFLOCK              (1 << __XFS_IFLOCK_BIT)
 216 #define __XFS_IPINNED_BIT       8        /* wakeup key for zero pin count */
 217 #define XFS_IPINNED             (1 << __XFS_IPINNED_BIT)
 218 #define XFS_IDONTCACHE          (1 << 9) /* don't cache the inode long term */
 219
 220 /*
 221  * Per-lifetime flags need to be reset when re-using a reclaimable inode during
 222  * inode lookup. This prevents unintended behaviour on the new inode from
 223  * ocurring.
 224  */
 225 #define XFS_IRECLAIM_RESET_FLAGS        \
 226         (XFS_IRECLAIMABLE | XFS_IRECLAIM | \
 227          XFS_IDIRTY_RELEASE | XFS_ITRUNCATED)
 228
 229 /*
 230  * Synchronize processes attempting to flush the in-core inode back to disk.
 231  */
 232
 233 extern void __xfs_iflock(struct xfs_inode *ip);
 234
 235 static inline int xfs_iflock_nowait(struct xfs_inode *ip)
 236 {
 237         return !xfs_iflags_test_and_set(ip, XFS_IFLOCK);
 238 }
 239
 240 static inline void xfs_iflock(struct xfs_inode *ip)
 241 {
 242         if (!xfs_iflock_nowait(ip))
 243                 __xfs_iflock(ip);
 244 }
 245
 246 static inline void xfs_ifunlock(struct xfs_inode *ip)
 247 {
 248         xfs_iflags_clear(ip, XFS_IFLOCK);
 249         smp_mb();
 250         wake_up_bit(&ip->i_flags, __XFS_IFLOCK_BIT);
 251 }
 252
 253 static inline int xfs_isiflocked(struct xfs_inode *ip)
 254 {
 255         return xfs_iflags_test(ip, XFS_IFLOCK);
 256 }
 257
 258 /*
 259  * Flags for inode locking.
 260  * Bit ranges:  1<<1  - 1<<16-1 -- iolock/ilock modes (bitfield)
 261  *              1<<16 - 1<<32-1 -- lockdep annotation (integers)
 262  */
 263 #define XFS_IOLOCK_EXCL         (1<<0)
 264 #define XFS_IOLOCK_SHARED       (1<<1)
 265 #define XFS_ILOCK_EXCL          (1<<2)
 266 #define XFS_ILOCK_SHARED        (1<<3)
 267 #define XFS_MMAPLOCK_EXCL       (1<<4)
 268 #define XFS_MMAPLOCK_SHARED     (1<<5)
 269
 270 #define XFS_LOCK_MASK           (XFS_IOLOCK_EXCL | XFS_IOLOCK_SHARED \
 271                                 | XFS_ILOCK_EXCL | XFS_ILOCK_SHARED \
 272                                 | XFS_MMAPLOCK_EXCL | XFS_MMAPLOCK_SHARED)
 273
 274 #define XFS_LOCK_FLAGS \
 275         { XFS_IOLOCK_EXCL,      "IOLOCK_EXCL" }, \
 276         { XFS_IOLOCK_SHARED,    "IOLOCK_SHARED" }, \
 277         { XFS_ILOCK_EXCL,       "ILOCK_EXCL" }, \
 278         { XFS_ILOCK_SHARED,     "ILOCK_SHARED" }, \
 279         { XFS_MMAPLOCK_EXCL,    "MMAPLOCK_EXCL" }, \
 280         { XFS_MMAPLOCK_SHARED,  "MMAPLOCK_SHARED" }
 281
 282
 283 /*
 284  * Flags for lockdep annotations.
 285  *
 286  * XFS_LOCK_PARENT - for directory operations that require locking a
 287  * parent directory inode and a child entry inode. IOLOCK requires nesting,
 288  * MMAPLOCK does not support this class, ILOCK requires a single subclass
 289  * to differentiate parent from child.
 290  *
 291  * XFS_LOCK_RTBITMAP/XFS_LOCK_RTSUM - the realtime device bitmap and summary
 292  * inodes do not participate in the normal lock order, and thus have their
 293  * own subclasses.
 294  *
 295  * XFS_LOCK_INUMORDER - for locking several inodes at the some time
 296  * with xfs_lock_inodes().  This flag is used as the starting subclass
 297  * and each subsequent lock acquired will increment the subclass by one.
 298  * However, MAX_LOCKDEP_SUBCLASSES == 8, which means we are greatly
 299  * limited to the subclasses we can represent via nesting. We need at least
 300  * 5 inodes nest depth for the ILOCK through rename, and we also have to support
 301  * XFS_ILOCK_PARENT, which gives 6 subclasses. Then we have XFS_ILOCK_RTBITMAP
 302  * and XFS_ILOCK_RTSUM, which are another 2 unique subclasses, so that's all
 303  * 8 subclasses supported by lockdep.
 304  *
 305  * This also means we have to number the sub-classes in the lowest bits of
 306  * the mask we keep, and we have to ensure we never exceed 3 bits of lockdep
 307  * mask and we can't use bit-masking to build the subclasses. What a mess.
 308  *
 309  * Bit layout:
 310  *
 311  * Bit          Lock Region
 312  * 16-19        XFS_IOLOCK_SHIFT dependencies
 313  * 20-23        XFS_MMAPLOCK_SHIFT dependencies
 314  * 24-31        XFS_ILOCK_SHIFT dependencies
 315  *
 316  * IOLOCK values
 317  *
 318  * 0-3          subclass value
 319  * 4-7          PARENT subclass values
 320  *
 321  * MMAPLOCK values
 322  *
 323  * 0-3          subclass value
 324  * 4-7          unused
 325  *
 326  * ILOCK values
 327  * 0-4          subclass values
 328  * 5            PARENT subclass (not nestable)
 329  * 6            RTBITMAP subclass (not nestable)
 330  * 7            RTSUM subclass (not nestable)
 331  *
 332  */
 333 #define XFS_IOLOCK_SHIFT                16
 334 #define XFS_IOLOCK_PARENT_VAL           4
 335 #define XFS_IOLOCK_MAX_SUBCLASS         (XFS_IOLOCK_PARENT_VAL - 1)
 336 #define XFS_IOLOCK_DEP_MASK             0x000f0000
 337 #define XFS_IOLOCK_PARENT               (XFS_IOLOCK_PARENT_VAL << XFS_IOLOCK_SHIFT)
 338
 339 #define XFS_MMAPLOCK_SHIFT              20
 340 #define XFS_MMAPLOCK_NUMORDER           0
 341 #define XFS_MMAPLOCK_MAX_SUBCLASS       3
 342 #define XFS_MMAPLOCK_DEP_MASK           0x00f00000
 343
 344 #define XFS_ILOCK_SHIFT                 24
 345 #define XFS_ILOCK_PARENT_VAL            5
 346 #define XFS_ILOCK_MAX_SUBCLASS          (XFS_ILOCK_PARENT_VAL - 1)
 347 #define XFS_ILOCK_RTBITMAP_VAL          6
 348 #define XFS_ILOCK_RTSUM_VAL             7
 349 #define XFS_ILOCK_DEP_MASK              0xff000000
 350 #define XFS_ILOCK_PARENT                (XFS_ILOCK_PARENT_VAL << XFS_ILOCK_SHIFT)
 351 #define XFS_ILOCK_RTBITMAP              (XFS_ILOCK_RTBITMAP_VAL << XFS_ILOCK_SHIFT)
 352 #define XFS_ILOCK_RTSUM                 (XFS_ILOCK_RTSUM_VAL << XFS_ILOCK_SHIFT)
 353
 354 #define XFS_LOCK_SUBCLASS_MASK  (XFS_IOLOCK_DEP_MASK | \
 355                                  XFS_MMAPLOCK_DEP_MASK | \
 356                                  XFS_ILOCK_DEP_MASK)
 357
 358 #define XFS_IOLOCK_DEP(flags)   (((flags) & XFS_IOLOCK_DEP_MASK) \
 359                                         >> XFS_IOLOCK_SHIFT)
 360 #define XFS_MMAPLOCK_DEP(flags) (((flags) & XFS_MMAPLOCK_DEP_MASK) \
 361                                         >> XFS_MMAPLOCK_SHIFT)
 362 #define XFS_ILOCK_DEP(flags)    (((flags) & XFS_ILOCK_DEP_MASK) \
 363                                         >> XFS_ILOCK_SHIFT)
 364
 365 /*
 366  * For multiple groups support: if S_ISGID bit is set in the parent
 367  * directory, group of new file is set to that of the parent, and
 368  * new subdirectory gets S_ISGID bit from parent.
 369  */
 370 #define XFS_INHERIT_GID(pip)    \
 371         (((pip)->i_mount->m_flags & XFS_MOUNT_GRPID) || \
 372          (VFS_I(pip)->i_mode & S_ISGID))
 373
 374 int             xfs_release(struct xfs_inode *ip);
 375 void            xfs_inactive(struct xfs_inode *ip);
 376 int             xfs_lookup(struct xfs_inode *dp, struct xfs_name *name,
 377                            struct xfs_inode **ipp, struct xfs_name *ci_name);
 378 int             xfs_create(struct xfs_inode *dp, struct xfs_name *name,
 379                            umode_t mode, xfs_dev_t rdev, struct xfs_inode **ipp);
 380 int             xfs_create_tmpfile(struct xfs_inode *dp, struct dentry *dentry,
 381                            umode_t mode, struct xfs_inode **ipp);
 382 int             xfs_remove(struct xfs_inode *dp, struct xfs_name *name,
 383                            struct xfs_inode *ip);
 384 int             xfs_link(struct xfs_inode *tdp, struct xfs_inode *sip,
 385                          struct xfs_name *target_name);
 386 int             xfs_rename(struct xfs_inode *src_dp, struct xfs_name *src_name,
 387                            struct xfs_inode *src_ip, struct xfs_inode *target_dp,
 388                            struct xfs_name *target_name,
 389                            struct xfs_inode *target_ip, unsigned int flags);
 390
 391 void            xfs_ilock(xfs_inode_t *, uint);
 392 int             xfs_ilock_nowait(xfs_inode_t *, uint);
 393 void            xfs_iunlock(xfs_inode_t *, uint);
 394 void            xfs_ilock_demote(xfs_inode_t *, uint);
 395 int             xfs_isilocked(xfs_inode_t *, uint);
 396 uint            xfs_ilock_data_map_shared(struct xfs_inode *);
 397 uint            xfs_ilock_attr_map_shared(struct xfs_inode *);
 398 int             xfs_ialloc(struct xfs_trans *, xfs_inode_t *, umode_t,
 399                            xfs_nlink_t, xfs_dev_t, prid_t, int,
 400                            struct xfs_buf **, xfs_inode_t **);
 401
 402 uint            xfs_ip2xflags(struct xfs_inode *);
 403 uint            xfs_dic2xflags(struct xfs_dinode *);
 404 int             xfs_ifree(struct xfs_trans *, xfs_inode_t *,
 405                            struct xfs_bmap_free *);
 406 int             xfs_itruncate_extents(struct xfs_trans **, struct xfs_inode *,
 407                                       int, xfs_fsize_t);
 408 void            xfs_iext_realloc(xfs_inode_t *, int, int);
 409
 410 void            xfs_iunpin_wait(xfs_inode_t *);
 411 #define xfs_ipincount(ip)       ((unsigned int) atomic_read(&ip->i_pincount))
 412
 413 int             xfs_iflush(struct xfs_inode *, struct xfs_buf **);
 414 void            xfs_lock_inodes(xfs_inode_t **, int, uint);
 415 void            xfs_lock_two_inodes(xfs_inode_t *, xfs_inode_t *, uint);
 416
 417 xfs_extlen_t    xfs_get_extsz_hint(struct xfs_inode *ip);
 418
 419 int             xfs_dir_ialloc(struct xfs_trans **, struct xfs_inode *, umode_t,
 420                                xfs_nlink_t, xfs_dev_t, prid_t, int,
 421                                struct xfs_inode **, int *);
 422 int             xfs_droplink(struct xfs_trans *, struct xfs_inode *);
 423 int             xfs_bumplink(struct xfs_trans *, struct xfs_inode *);
 424
 425 /* from xfs_file.c */
 426 enum xfs_prealloc_flags {
 427         XFS_PREALLOC_SET        = (1 << 1),
 428         XFS_PREALLOC_CLEAR      = (1 << 2),
 429         XFS_PREALLOC_SYNC       = (1 << 3),
 430         XFS_PREALLOC_INVISIBLE  = (1 << 4),
 431 };
 432
 433 int     xfs_update_prealloc_flags(struct xfs_inode *ip,
 434                                   enum xfs_prealloc_flags flags);
 435 int     xfs_zero_eof(struct xfs_inode *ip, xfs_off_t offset,
 436                      xfs_fsize_t isize, bool *did_zeroing);
 437 int     xfs_iozero(struct xfs_inode *ip, loff_t pos, size_t count);
 438 loff_t  __xfs_seek_hole_data(struct inode *inode, loff_t start,
 439                              loff_t eof, int whence);
 440
 441
 442 /* from xfs_iops.c */
 443 /*
 444  * When setting up a newly allocated inode, we need to call
 445  * xfs_finish_inode_setup() once the inode is fully instantiated at
 446  * the VFS level to prevent the rest of the world seeing the inode
 447  * before we've completed instantiation. Otherwise we can do it
 448  * the moment the inode lookup is complete.
 449  */
 450 extern void xfs_setup_inode(struct xfs_inode *ip);
 451 static inline void xfs_finish_inode_setup(struct xfs_inode *ip)
 452 {
 453         xfs_iflags_clear(ip, XFS_INEW);
 454         barrier();
 455         unlock_new_inode(VFS_I(ip));
 456 }
 457
 458 static inline void xfs_setup_existing_inode(struct xfs_inode *ip)
 459 {
 460         xfs_setup_inode(ip);
 461         xfs_finish_inode_setup(ip);
 462 }
 463
 464 #define IHOLD(ip) \
 465 do { \
 466         ASSERT(atomic_read(&VFS_I(ip)->i_count) > 0) ; \
 467         ihold(VFS_I(ip)); \
 468         trace_xfs_ihold(ip, _THIS_IP_); \
 469 } while (0)
 470
 471 #define IRELE(ip) \
 472 do { \
 473         trace_xfs_irele(ip, _THIS_IP_); \
 474         iput(VFS_I(ip)); \
 475 } while (0)
 476
 477 extern struct kmem_zone *xfs_inode_zone;
 478
 479 /*
 480  * Flags for read/write calls
 481  */
 482 #define XFS_IO_ISDIRECT 0x00001         /* bypass page cache */
 483 #define XFS_IO_INVIS    0x00002         /* don't update inode timestamps */
 484
 485 #define XFS_IO_FLAGS \
 486         { XFS_IO_ISDIRECT,      "DIRECT" }, \
 487         { XFS_IO_INVIS,         "INVIS"}
 488
 489 #endif  /* __XFS_INODE_H__ */