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         /* Transaction and locking information. */
  53         struct xfs_inode_log_item *i_itemp;     /* logging information */
  54         mrlock_t                i_lock;         /* inode lock */
  55         mrlock_t                i_iolock;       /* inode IO lock */
  56         atomic_t                i_pincount;     /* inode pin count */
  57         spinlock_t              i_flags_lock;   /* inode i_flags lock */
  58         /* Miscellaneous state. */
  59         unsigned long           i_flags;        /* see defined flags below */
  60         unsigned int            i_delayed_blks; /* count of delay alloc blks */
  61
  62         xfs_icdinode_t          i_d;            /* most of ondisk inode */
  63
  64         /* VFS inode */
  65         struct inode            i_vnode;        /* embedded VFS inode */
  66 } xfs_inode_t;
  67
  68 /* Convert from vfs inode to xfs inode */
  69 static inline struct xfs_inode *XFS_I(struct inode *inode)
  70 {
  71         return container_of(inode, struct xfs_inode, i_vnode);
  72 }
  73
  74 /* convert from xfs inode to vfs inode */
  75 static inline struct inode *VFS_I(struct xfs_inode *ip)
  76 {
  77         return &ip->i_vnode;
  78 }
  79
  80 /*
  81  * For regular files we only update the on-disk filesize when actually
  82  * writing data back to disk.  Until then only the copy in the VFS inode
  83  * is uptodate.
  84  */
  85 static inline xfs_fsize_t XFS_ISIZE(struct xfs_inode *ip)
  86 {
  87         if (S_ISREG(ip->i_d.di_mode))
  88                 return i_size_read(VFS_I(ip));
  89         return ip->i_d.di_size;
  90 }
  91
  92 /*
  93  * If this I/O goes past the on-disk inode size update it unless it would
  94  * be past the current in-core inode size.
  95  */
  96 static inline xfs_fsize_t
  97 xfs_new_eof(struct xfs_inode *ip, xfs_fsize_t new_size)
  98 {
  99         xfs_fsize_t i_size = i_size_read(VFS_I(ip));
 100
 101         if (new_size > i_size)
 102                 new_size = i_size;
 103         return new_size > ip->i_d.di_size ? new_size : 0;
 104 }
 105
 106 /*
 107  * i_flags helper functions
 108  */
 109 static inline void
 110 __xfs_iflags_set(xfs_inode_t *ip, unsigned short flags)
 111 {
 112         ip->i_flags |= flags;
 113 }
 114
 115 static inline void
 116 xfs_iflags_set(xfs_inode_t *ip, unsigned short flags)
 117 {
 118         spin_lock(&ip->i_flags_lock);
 119         __xfs_iflags_set(ip, flags);
 120         spin_unlock(&ip->i_flags_lock);
 121 }
 122
 123 static inline void
 124 xfs_iflags_clear(xfs_inode_t *ip, unsigned short flags)
 125 {
 126         spin_lock(&ip->i_flags_lock);
 127         ip->i_flags &= ~flags;
 128         spin_unlock(&ip->i_flags_lock);
 129 }
 130
 131 static inline int
 132 __xfs_iflags_test(xfs_inode_t *ip, unsigned short flags)
 133 {
 134         return (ip->i_flags & flags);
 135 }
 136
 137 static inline int
 138 xfs_iflags_test(xfs_inode_t *ip, unsigned short flags)
 139 {
 140         int ret;
 141         spin_lock(&ip->i_flags_lock);
 142         ret = __xfs_iflags_test(ip, flags);
 143         spin_unlock(&ip->i_flags_lock);
 144         return ret;
 145 }
 146
 147 static inline int
 148 xfs_iflags_test_and_clear(xfs_inode_t *ip, unsigned short flags)
 149 {
 150         int ret;
 151
 152         spin_lock(&ip->i_flags_lock);
 153         ret = ip->i_flags & flags;
 154         if (ret)
 155                 ip->i_flags &= ~flags;
 156         spin_unlock(&ip->i_flags_lock);
 157         return ret;
 158 }
 159
 160 static inline int
 161 xfs_iflags_test_and_set(xfs_inode_t *ip, unsigned short flags)
 162 {
 163         int ret;
 164
 165         spin_lock(&ip->i_flags_lock);
 166         ret = ip->i_flags & flags;
 167         if (!ret)
 168                 ip->i_flags |= flags;
 169         spin_unlock(&ip->i_flags_lock);
 170         return ret;
 171 }
 172
 173 /*
 174  * Project quota id helpers (previously projid was 16bit only
 175  * and using two 16bit values to hold new 32bit projid was chosen
 176  * to retain compatibility with "old" filesystems).
 177  */
 178 static inline prid_t
 179 xfs_get_projid(struct xfs_inode *ip)
 180 {
 181         return (prid_t)ip->i_d.di_projid_hi << 16 | ip->i_d.di_projid_lo;
 182 }
 183
 184 static inline void
 185 xfs_set_projid(struct xfs_inode *ip,
 186                 prid_t projid)
 187 {
 188         ip->i_d.di_projid_hi = (__uint16_t) (projid >> 16);
 189         ip->i_d.di_projid_lo = (__uint16_t) (projid & 0xffff);
 190 }
 191
 192 /*
 193  * In-core inode flags.
 194  */
 195 #define XFS_IRECLAIM            (1 << 0) /* started reclaiming this inode */
 196 #define XFS_ISTALE              (1 << 1) /* inode has been staled */
 197 #define XFS_IRECLAIMABLE        (1 << 2) /* inode can be reclaimed */
 198 #define XFS_INEW                (1 << 3) /* inode has just been allocated */
 199 #define XFS_IFILESTREAM         (1 << 4) /* inode is in a filestream dir. */
 200 #define XFS_ITRUNCATED          (1 << 5) /* truncated down so flush-on-close */
 201 #define XFS_IDIRTY_RELEASE      (1 << 6) /* dirty release already seen */
 202 #define __XFS_IFLOCK_BIT        7        /* inode is being flushed right now */
 203 #define XFS_IFLOCK              (1 << __XFS_IFLOCK_BIT)
 204 #define __XFS_IPINNED_BIT       8        /* wakeup key for zero pin count */
 205 #define XFS_IPINNED             (1 << __XFS_IPINNED_BIT)
 206 #define XFS_IDONTCACHE          (1 << 9) /* don't cache the inode long term */
 207
 208 /*
 209  * Per-lifetime flags need to be reset when re-using a reclaimable inode during
 210  * inode lookup. This prevents unintended behaviour on the new inode from
 211  * ocurring.
 212  */
 213 #define XFS_IRECLAIM_RESET_FLAGS        \
 214         (XFS_IRECLAIMABLE | XFS_IRECLAIM | \
 215          XFS_IDIRTY_RELEASE | XFS_ITRUNCATED | \
 216          XFS_IFILESTREAM);
 217
 218 /*
 219  * Synchronize processes attempting to flush the in-core inode back to disk.
 220  */
 221
 222 extern void __xfs_iflock(struct xfs_inode *ip);
 223
 224 static inline int xfs_iflock_nowait(struct xfs_inode *ip)
 225 {
 226         return !xfs_iflags_test_and_set(ip, XFS_IFLOCK);
 227 }
 228
 229 static inline void xfs_iflock(struct xfs_inode *ip)
 230 {
 231         if (!xfs_iflock_nowait(ip))
 232                 __xfs_iflock(ip);
 233 }
 234
 235 static inline void xfs_ifunlock(struct xfs_inode *ip)
 236 {
 237         xfs_iflags_clear(ip, XFS_IFLOCK);
 238         smp_mb();
 239         wake_up_bit(&ip->i_flags, __XFS_IFLOCK_BIT);
 240 }
 241
 242 static inline int xfs_isiflocked(struct xfs_inode *ip)
 243 {
 244         return xfs_iflags_test(ip, XFS_IFLOCK);
 245 }
 246
 247 /*
 248  * Flags for inode locking.
 249  * Bit ranges:  1<<1  - 1<<16-1 -- iolock/ilock modes (bitfield)
 250  *              1<<16 - 1<<32-1 -- lockdep annotation (integers)
 251  */
 252 #define XFS_IOLOCK_EXCL         (1<<0)
 253 #define XFS_IOLOCK_SHARED       (1<<1)
 254 #define XFS_ILOCK_EXCL          (1<<2)
 255 #define XFS_ILOCK_SHARED        (1<<3)
 256
 257 #define XFS_LOCK_MASK           (XFS_IOLOCK_EXCL | XFS_IOLOCK_SHARED \
 258                                 | XFS_ILOCK_EXCL | XFS_ILOCK_SHARED)
 259
 260 #define XFS_LOCK_FLAGS \
 261         { XFS_IOLOCK_EXCL,      "IOLOCK_EXCL" }, \
 262         { XFS_IOLOCK_SHARED,    "IOLOCK_SHARED" }, \
 263         { XFS_ILOCK_EXCL,       "ILOCK_EXCL" }, \
 264         { XFS_ILOCK_SHARED,     "ILOCK_SHARED" }
 265
 266
 267 /*
 268  * Flags for lockdep annotations.
 269  *
 270  * XFS_LOCK_PARENT - for directory operations that require locking a
 271  * parent directory inode and a child entry inode.  The parent gets locked
 272  * with this flag so it gets a lockdep subclass of 1 and the child entry
 273  * lock will have a lockdep subclass of 0.
 274  *
 275  * XFS_LOCK_RTBITMAP/XFS_LOCK_RTSUM - the realtime device bitmap and summary
 276  * inodes do not participate in the normal lock order, and thus have their
 277  * own subclasses.
 278  *
 279  * XFS_LOCK_INUMORDER - for locking several inodes at the some time
 280  * with xfs_lock_inodes().  This flag is used as the starting subclass
 281  * and each subsequent lock acquired will increment the subclass by one.
 282  * So the first lock acquired will have a lockdep subclass of 4, the
 283  * second lock will have a lockdep subclass of 5, and so on. It is
 284  * the responsibility of the class builder to shift this to the correct
 285  * portion of the lock_mode lockdep mask.
 286  */
 287 #define XFS_LOCK_PARENT         1
 288 #define XFS_LOCK_RTBITMAP       2
 289 #define XFS_LOCK_RTSUM          3
 290 #define XFS_LOCK_INUMORDER      4
 291
 292 #define XFS_IOLOCK_SHIFT        16
 293 #define XFS_IOLOCK_PARENT       (XFS_LOCK_PARENT << XFS_IOLOCK_SHIFT)
 294
 295 #define XFS_ILOCK_SHIFT         24
 296 #define XFS_ILOCK_PARENT        (XFS_LOCK_PARENT << XFS_ILOCK_SHIFT)
 297 #define XFS_ILOCK_RTBITMAP      (XFS_LOCK_RTBITMAP << XFS_ILOCK_SHIFT)
 298 #define XFS_ILOCK_RTSUM         (XFS_LOCK_RTSUM << XFS_ILOCK_SHIFT)
 299
 300 #define XFS_IOLOCK_DEP_MASK     0x00ff0000
 301 #define XFS_ILOCK_DEP_MASK      0xff000000
 302 #define XFS_LOCK_DEP_MASK       (XFS_IOLOCK_DEP_MASK | XFS_ILOCK_DEP_MASK)
 303
 304 #define XFS_IOLOCK_DEP(flags)   (((flags) & XFS_IOLOCK_DEP_MASK) >> XFS_IOLOCK_SHIFT)
 305 #define XFS_ILOCK_DEP(flags)    (((flags) & XFS_ILOCK_DEP_MASK) >> XFS_ILOCK_SHIFT)
 306
 307 /*
 308  * For multiple groups support: if S_ISGID bit is set in the parent
 309  * directory, group of new file is set to that of the parent, and
 310  * new subdirectory gets S_ISGID bit from parent.
 311  */
 312 #define XFS_INHERIT_GID(pip)    \
 313         (((pip)->i_mount->m_flags & XFS_MOUNT_GRPID) || \
 314          ((pip)->i_d.di_mode & S_ISGID))
 315
 316
 317 int             xfs_release(struct xfs_inode *ip);
 318 void            xfs_inactive(struct xfs_inode *ip);
 319 int             xfs_lookup(struct xfs_inode *dp, struct xfs_name *name,
 320                            struct xfs_inode **ipp, struct xfs_name *ci_name);
 321 int             xfs_create(struct xfs_inode *dp, struct xfs_name *name,
 322                            umode_t mode, xfs_dev_t rdev, struct xfs_inode **ipp);
 323 int             xfs_remove(struct xfs_inode *dp, struct xfs_name *name,
 324                            struct xfs_inode *ip);
 325 int             xfs_link(struct xfs_inode *tdp, struct xfs_inode *sip,
 326                          struct xfs_name *target_name);
 327 int             xfs_rename(struct xfs_inode *src_dp, struct xfs_name *src_name,
 328                            struct xfs_inode *src_ip, struct xfs_inode *target_dp,
 329                            struct xfs_name *target_name,
 330                            struct xfs_inode *target_ip);
 331
 332 void            xfs_ilock(xfs_inode_t *, uint);
 333 int             xfs_ilock_nowait(xfs_inode_t *, uint);
 334 void            xfs_iunlock(xfs_inode_t *, uint);
 335 void            xfs_ilock_demote(xfs_inode_t *, uint);
 336 int             xfs_isilocked(xfs_inode_t *, uint);
 337 uint            xfs_ilock_map_shared(xfs_inode_t *);
 338 void            xfs_iunlock_map_shared(xfs_inode_t *, uint);
 339 int             xfs_ialloc(struct xfs_trans *, xfs_inode_t *, umode_t,
 340                            xfs_nlink_t, xfs_dev_t, prid_t, int,
 341                            struct xfs_buf **, xfs_inode_t **);
 342
 343 uint            xfs_ip2xflags(struct xfs_inode *);
 344 uint            xfs_dic2xflags(struct xfs_dinode *);
 345 int             xfs_ifree(struct xfs_trans *, xfs_inode_t *,
 346                            struct xfs_bmap_free *);
 347 int             xfs_itruncate_extents(struct xfs_trans **, struct xfs_inode *,
 348                                       int, xfs_fsize_t);
 349 int             xfs_iunlink(struct xfs_trans *, xfs_inode_t *);
 350
 351 void            xfs_iext_realloc(xfs_inode_t *, int, int);
 352
 353 void            xfs_iunpin_wait(xfs_inode_t *);
 354 #define xfs_ipincount(ip)       ((unsigned int) atomic_read(&ip->i_pincount))
 355
 356 int             xfs_iflush(struct xfs_inode *, struct xfs_buf **);
 357 void            xfs_lock_inodes(xfs_inode_t **, int, uint);
 358 void            xfs_lock_two_inodes(xfs_inode_t *, xfs_inode_t *, uint);
 359
 360 xfs_extlen_t    xfs_get_extsz_hint(struct xfs_inode *ip);
 361
 362 int             xfs_dir_ialloc(struct xfs_trans **, struct xfs_inode *, umode_t,
 363                                xfs_nlink_t, xfs_dev_t, prid_t, int,
 364                                struct xfs_inode **, int *);
 365 int             xfs_droplink(struct xfs_trans *, struct xfs_inode *);
 366 int             xfs_bumplink(struct xfs_trans *, struct xfs_inode *);
 367 void            xfs_bump_ino_vers2(struct xfs_trans *, struct xfs_inode *);
 368
 369 /* from xfs_file.c */
 370 int             xfs_zero_eof(struct xfs_inode *, xfs_off_t, xfs_fsize_t);
 371 int             xfs_iozero(struct xfs_inode *, loff_t, size_t);
 372
 373
 374 #define IHOLD(ip) \
 375 do { \
 376         ASSERT(atomic_read(&VFS_I(ip)->i_count) > 0) ; \
 377         ihold(VFS_I(ip)); \
 378         trace_xfs_ihold(ip, _THIS_IP_); \
 379 } while (0)
 380
 381 #define IRELE(ip) \
 382 do { \
 383         trace_xfs_irele(ip, _THIS_IP_); \
 384         iput(VFS_I(ip)); \
 385 } while (0)
 386
 387 extern struct kmem_zone *xfs_inode_zone;
 388
 389 #endif  /* __XFS_INODE_H__ */