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
  28 struct xfs_dinode;
  29 struct xfs_inode;
  30 struct xfs_buf;
  31 struct xfs_bmap_free;
  32 struct xfs_bmbt_irec;
  33 struct xfs_inode_log_item;
  34 struct xfs_mount;
  35 struct xfs_trans;
  36 struct xfs_dquot;
  37
  38 typedef struct xfs_inode {
  39         /* Inode linking and identification information. */
  40         struct xfs_mount        *i_mount;       /* fs mount struct ptr */
  41         struct xfs_dquot        *i_udquot;      /* user dquot */
  42         struct xfs_dquot        *i_gdquot;      /* group dquot */
  43         struct xfs_dquot        *i_pdquot;      /* project dquot */
  44
  45         /* Inode location stuff */
  46         xfs_ino_t               i_ino;          /* inode number (agno/agino)*/
  47         struct xfs_imap         i_imap;         /* location for xfs_imap() */
  48
  49         /* Extent information. */
  50         xfs_ifork_t             *i_afp;         /* attribute fork pointer */
  51         xfs_ifork_t             i_df;           /* data fork */
  52
  53         /* Transaction and locking information. */
  54         struct xfs_inode_log_item *i_itemp;     /* logging information */
  55         mrlock_t                i_lock;         /* inode lock */
  56         mrlock_t                i_iolock;       /* inode IO lock */
  57         atomic_t                i_pincount;     /* inode pin count */
  58         spinlock_t              i_flags_lock;   /* inode i_flags lock */
  59         /* Miscellaneous state. */
  60         unsigned long           i_flags;        /* see defined flags below */
  61         unsigned int            i_delayed_blks; /* count of delay alloc blks */
  62
  63         xfs_icdinode_t          i_d;            /* most of ondisk inode */
  64
  65         /* VFS inode */
  66         struct inode            i_vnode;        /* embedded VFS inode */
  67 } xfs_inode_t;
  68
  69 /* Convert from vfs inode to xfs inode */
  70 static inline struct xfs_inode *XFS_I(struct inode *inode)
  71 {
  72         return container_of(inode, struct xfs_inode, i_vnode);
  73 }
  74
  75 /* convert from xfs inode to vfs inode */
  76 static inline struct inode *VFS_I(struct xfs_inode *ip)
  77 {
  78         return &ip->i_vnode;
  79 }
  80
  81 /*
  82  * For regular files we only update the on-disk filesize when actually
  83  * writing data back to disk.  Until then only the copy in the VFS inode
  84  * is uptodate.
  85  */
  86 static inline xfs_fsize_t XFS_ISIZE(struct xfs_inode *ip)
  87 {
  88         if (S_ISREG(ip->i_d.di_mode))
  89                 return i_size_read(VFS_I(ip));
  90         return ip->i_d.di_size;
  91 }
  92
  93 /*
  94  * If this I/O goes past the on-disk inode size update it unless it would
  95  * be past the current in-core inode size.
  96  */
  97 static inline xfs_fsize_t
  98 xfs_new_eof(struct xfs_inode *ip, xfs_fsize_t new_size)
  99 {
 100         xfs_fsize_t i_size = i_size_read(VFS_I(ip));
 101
 102         if (new_size > i_size)
 103                 new_size = i_size;
 104         return new_size > ip->i_d.di_size ? new_size : 0;
 105 }
 106
 107 /*
 108  * i_flags helper functions
 109  */
 110 static inline void
 111 __xfs_iflags_set(xfs_inode_t *ip, unsigned short flags)
 112 {
 113         ip->i_flags |= flags;
 114 }
 115
 116 static inline void
 117 xfs_iflags_set(xfs_inode_t *ip, unsigned short flags)
 118 {
 119         spin_lock(&ip->i_flags_lock);
 120         __xfs_iflags_set(ip, flags);
 121         spin_unlock(&ip->i_flags_lock);
 122 }
 123
 124 static inline void
 125 xfs_iflags_clear(xfs_inode_t *ip, unsigned short flags)
 126 {
 127         spin_lock(&ip->i_flags_lock);
 128         ip->i_flags &= ~flags;
 129         spin_unlock(&ip->i_flags_lock);
 130 }
 131
 132 static inline int
 133 __xfs_iflags_test(xfs_inode_t *ip, unsigned short flags)
 134 {
 135         return (ip->i_flags & flags);
 136 }
 137
 138 static inline int
 139 xfs_iflags_test(xfs_inode_t *ip, unsigned short flags)
 140 {
 141         int ret;
 142         spin_lock(&ip->i_flags_lock);
 143         ret = __xfs_iflags_test(ip, flags);
 144         spin_unlock(&ip->i_flags_lock);
 145         return ret;
 146 }
 147
 148 static inline int
 149 xfs_iflags_test_and_clear(xfs_inode_t *ip, unsigned short flags)
 150 {
 151         int ret;
 152
 153         spin_lock(&ip->i_flags_lock);
 154         ret = ip->i_flags & flags;
 155         if (ret)
 156                 ip->i_flags &= ~flags;
 157         spin_unlock(&ip->i_flags_lock);
 158         return ret;
 159 }
 160
 161 static inline int
 162 xfs_iflags_test_and_set(xfs_inode_t *ip, unsigned short flags)
 163 {
 164         int ret;
 165
 166         spin_lock(&ip->i_flags_lock);
 167         ret = ip->i_flags & flags;
 168         if (!ret)
 169                 ip->i_flags |= flags;
 170         spin_unlock(&ip->i_flags_lock);
 171         return ret;
 172 }
 173
 174 /*
 175  * Project quota id helpers (previously projid was 16bit only
 176  * and using two 16bit values to hold new 32bit projid was chosen
 177  * to retain compatibility with "old" filesystems).
 178  */
 179 static inline prid_t
 180 xfs_get_projid(struct xfs_inode *ip)
 181 {
 182         return (prid_t)ip->i_d.di_projid_hi << 16 | ip->i_d.di_projid_lo;
 183 }
 184
 185 static inline void
 186 xfs_set_projid(struct xfs_inode *ip,
 187                 prid_t projid)
 188 {
 189         ip->i_d.di_projid_hi = (__uint16_t) (projid >> 16);
 190         ip->i_d.di_projid_lo = (__uint16_t) (projid & 0xffff);
 191 }
 192
 193 /*
 194  * In-core inode flags.
 195  */
 196 #define XFS_IRECLAIM            (1 << 0) /* started reclaiming this inode */
 197 #define XFS_ISTALE              (1 << 1) /* inode has been staled */
 198 #define XFS_IRECLAIMABLE        (1 << 2) /* inode can be reclaimed */
 199 #define XFS_INEW                (1 << 3) /* inode has just been allocated */
 200 #define XFS_IFILESTREAM         (1 << 4) /* inode is in a filestream dir. */
 201 #define XFS_ITRUNCATED          (1 << 5) /* truncated down so flush-on-close */
 202 #define XFS_IDIRTY_RELEASE      (1 << 6) /* dirty release already seen */
 203 #define __XFS_IFLOCK_BIT        7        /* inode is being flushed right now */
 204 #define XFS_IFLOCK              (1 << __XFS_IFLOCK_BIT)
 205 #define __XFS_IPINNED_BIT       8        /* wakeup key for zero pin count */
 206 #define XFS_IPINNED             (1 << __XFS_IPINNED_BIT)
 207 #define XFS_IDONTCACHE          (1 << 9) /* don't cache the inode long term */
 208
 209 /*
 210  * Per-lifetime flags need to be reset when re-using a reclaimable inode during
 211  * inode lookup. This prevents unintended behaviour on the new inode from
 212  * ocurring.
 213  */
 214 #define XFS_IRECLAIM_RESET_FLAGS        \
 215         (XFS_IRECLAIMABLE | XFS_IRECLAIM | \
 216          XFS_IDIRTY_RELEASE | XFS_ITRUNCATED | \
 217          XFS_IFILESTREAM);
 218
 219 /*
 220  * Synchronize processes attempting to flush the in-core inode back to disk.
 221  */
 222
 223 extern void __xfs_iflock(struct xfs_inode *ip);
 224
 225 static inline int xfs_iflock_nowait(struct xfs_inode *ip)
 226 {
 227         return !xfs_iflags_test_and_set(ip, XFS_IFLOCK);
 228 }
 229
 230 static inline void xfs_iflock(struct xfs_inode *ip)
 231 {
 232         if (!xfs_iflock_nowait(ip))
 233                 __xfs_iflock(ip);
 234 }
 235
 236 static inline void xfs_ifunlock(struct xfs_inode *ip)
 237 {
 238         xfs_iflags_clear(ip, XFS_IFLOCK);
 239         smp_mb();
 240         wake_up_bit(&ip->i_flags, __XFS_IFLOCK_BIT);
 241 }
 242
 243 static inline int xfs_isiflocked(struct xfs_inode *ip)
 244 {
 245         return xfs_iflags_test(ip, XFS_IFLOCK);
 246 }
 247
 248 /*
 249  * Flags for inode locking.
 250  * Bit ranges:  1<<1  - 1<<16-1 -- iolock/ilock modes (bitfield)
 251  *              1<<16 - 1<<32-1 -- lockdep annotation (integers)
 252  */
 253 #define XFS_IOLOCK_EXCL         (1<<0)
 254 #define XFS_IOLOCK_SHARED       (1<<1)
 255 #define XFS_ILOCK_EXCL          (1<<2)
 256 #define XFS_ILOCK_SHARED        (1<<3)
 257
 258 #define XFS_LOCK_MASK           (XFS_IOLOCK_EXCL | XFS_IOLOCK_SHARED \
 259                                 | XFS_ILOCK_EXCL | XFS_ILOCK_SHARED)
 260
 261 #define XFS_LOCK_FLAGS \
 262         { XFS_IOLOCK_EXCL,      "IOLOCK_EXCL" }, \
 263         { XFS_IOLOCK_SHARED,    "IOLOCK_SHARED" }, \
 264         { XFS_ILOCK_EXCL,       "ILOCK_EXCL" }, \
 265         { XFS_ILOCK_SHARED,     "ILOCK_SHARED" }
 266
 267
 268 /*
 269  * Flags for lockdep annotations.
 270  *
 271  * XFS_LOCK_PARENT - for directory operations that require locking a
 272  * parent directory inode and a child entry inode.  The parent gets locked
 273  * with this flag so it gets a lockdep subclass of 1 and the child entry
 274  * lock will have a lockdep subclass of 0.
 275  *
 276  * XFS_LOCK_RTBITMAP/XFS_LOCK_RTSUM - the realtime device bitmap and summary
 277  * inodes do not participate in the normal lock order, and thus have their
 278  * own subclasses.
 279  *
 280  * XFS_LOCK_INUMORDER - for locking several inodes at the some time
 281  * with xfs_lock_inodes().  This flag is used as the starting subclass
 282  * and each subsequent lock acquired will increment the subclass by one.
 283  * So the first lock acquired will have a lockdep subclass of 4, the
 284  * second lock will have a lockdep subclass of 5, and so on. It is
 285  * the responsibility of the class builder to shift this to the correct
 286  * portion of the lock_mode lockdep mask.
 287  */
 288 #define XFS_LOCK_PARENT         1
 289 #define XFS_LOCK_RTBITMAP       2
 290 #define XFS_LOCK_RTSUM          3
 291 #define XFS_LOCK_INUMORDER      4
 292
 293 #define XFS_IOLOCK_SHIFT        16
 294 #define XFS_IOLOCK_PARENT       (XFS_LOCK_PARENT << XFS_IOLOCK_SHIFT)
 295
 296 #define XFS_ILOCK_SHIFT         24
 297 #define XFS_ILOCK_PARENT        (XFS_LOCK_PARENT << XFS_ILOCK_SHIFT)
 298 #define XFS_ILOCK_RTBITMAP      (XFS_LOCK_RTBITMAP << XFS_ILOCK_SHIFT)
 299 #define XFS_ILOCK_RTSUM         (XFS_LOCK_RTSUM << XFS_ILOCK_SHIFT)
 300
 301 #define XFS_IOLOCK_DEP_MASK     0x00ff0000
 302 #define XFS_ILOCK_DEP_MASK      0xff000000
 303 #define XFS_LOCK_DEP_MASK       (XFS_IOLOCK_DEP_MASK | XFS_ILOCK_DEP_MASK)
 304
 305 #define XFS_IOLOCK_DEP(flags)   (((flags) & XFS_IOLOCK_DEP_MASK) >> XFS_IOLOCK_SHIFT)
 306 #define XFS_ILOCK_DEP(flags)    (((flags) & XFS_ILOCK_DEP_MASK) >> XFS_ILOCK_SHIFT)
 307
 308 /*
 309  * For multiple groups support: if S_ISGID bit is set in the parent
 310  * directory, group of new file is set to that of the parent, and
 311  * new subdirectory gets S_ISGID bit from parent.
 312  */
 313 #define XFS_INHERIT_GID(pip)    \
 314         (((pip)->i_mount->m_flags & XFS_MOUNT_GRPID) || \
 315          ((pip)->i_d.di_mode & S_ISGID))
 316
 317
 318 int             xfs_release(struct xfs_inode *ip);
 319 int             xfs_inactive(struct xfs_inode *ip);
 320 int             xfs_lookup(struct xfs_inode *dp, struct xfs_name *name,
 321                            struct xfs_inode **ipp, struct xfs_name *ci_name);
 322 int             xfs_create(struct xfs_inode *dp, struct xfs_name *name,
 323                            umode_t mode, xfs_dev_t rdev, struct xfs_inode **ipp);
 324 int             xfs_remove(struct xfs_inode *dp, struct xfs_name *name,
 325                            struct xfs_inode *ip);
 326 int             xfs_link(struct xfs_inode *tdp, struct xfs_inode *sip,
 327                          struct xfs_name *target_name);
 328 int             xfs_rename(struct xfs_inode *src_dp, struct xfs_name *src_name,
 329                            struct xfs_inode *src_ip, struct xfs_inode *target_dp,
 330                            struct xfs_name *target_name,
 331                            struct xfs_inode *target_ip);
 332
 333 void            xfs_ilock(xfs_inode_t *, uint);
 334 int             xfs_ilock_nowait(xfs_inode_t *, uint);
 335 void            xfs_iunlock(xfs_inode_t *, uint);
 336 void            xfs_ilock_demote(xfs_inode_t *, uint);
 337 int             xfs_isilocked(xfs_inode_t *, uint);
 338 uint            xfs_ilock_map_shared(xfs_inode_t *);
 339 void            xfs_iunlock_map_shared(xfs_inode_t *, uint);
 340 int             xfs_ialloc(struct xfs_trans *, xfs_inode_t *, umode_t,
 341                            xfs_nlink_t, xfs_dev_t, prid_t, int,
 342                            struct xfs_buf **, xfs_inode_t **);
 343
 344 uint            xfs_ip2xflags(struct xfs_inode *);
 345 uint            xfs_dic2xflags(struct xfs_dinode *);
 346 int             xfs_ifree(struct xfs_trans *, xfs_inode_t *,
 347                            struct xfs_bmap_free *);
 348 int             xfs_itruncate_extents(struct xfs_trans **, struct xfs_inode *,
 349                                       int, xfs_fsize_t);
 350 int             xfs_iunlink(struct xfs_trans *, xfs_inode_t *);
 351
 352 void            xfs_iext_realloc(xfs_inode_t *, int, int);
 353
 354 void            xfs_iunpin_wait(xfs_inode_t *);
 355 #define xfs_ipincount(ip)       ((unsigned int) atomic_read(&ip->i_pincount))
 356
 357 int             xfs_iflush(struct xfs_inode *, struct xfs_buf **);
 358 void            xfs_lock_inodes(xfs_inode_t **, int, uint);
 359 void            xfs_lock_two_inodes(xfs_inode_t *, xfs_inode_t *, uint);
 360
 361 xfs_extlen_t    xfs_get_extsz_hint(struct xfs_inode *ip);
 362
 363 int             xfs_dir_ialloc(struct xfs_trans **, struct xfs_inode *, umode_t,
 364                                xfs_nlink_t, xfs_dev_t, prid_t, int,
 365                                struct xfs_inode **, int *);
 366 int             xfs_droplink(struct xfs_trans *, struct xfs_inode *);
 367 int             xfs_bumplink(struct xfs_trans *, struct xfs_inode *);
 368 void            xfs_bump_ino_vers2(struct xfs_trans *, struct xfs_inode *);
 369
 370 /* from xfs_file.c */
 371 int             xfs_zero_eof(struct xfs_inode *, xfs_off_t, xfs_fsize_t);
 372 int             xfs_iozero(struct xfs_inode *, loff_t, size_t);
 373
 374
 375 #define IHOLD(ip) \
 376 do { \
 377         ASSERT(atomic_read(&VFS_I(ip)->i_count) > 0) ; \
 378         ihold(VFS_I(ip)); \
 379         trace_xfs_ihold(ip, _THIS_IP_); \
 380 } while (0)
 381
 382 #define IRELE(ip) \
 383 do { \
 384         trace_xfs_irele(ip, _THIS_IP_); \
 385         iput(VFS_I(ip)); \
 386 } while (0)
 387
 388 extern struct kmem_zone *xfs_inode_zone;
 389
 390 #endif  /* __XFS_INODE_H__ */