xfs_inode.h

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/*
 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#ifndef __XFS_INODE_H__
#define __XFS_INODE_H__

struct posix_acl;
struct xfs_dinode;
struct xfs_inode;

/*
 * Fork identifiers.
 */
#define XFS_DATA_FORK   0
#define XFS_ATTR_FORK   1

/*
 * The following xfs_ext_irec_t struct introduces a second (top) level
 * to the in-core extent allocation scheme. These structs are allocated
 * in a contiguous block, creating an indirection array where each entry
 * (irec) contains a pointer to a buffer of in-core extent records which
 * it manages. Each extent buffer is 4k in size, since 4k is the system
 * page size on Linux i386 and systems with larger page sizes don't seem
 * to gain much, if anything, by using their native page size as the
 * extent buffer size. Also, using 4k extent buffers everywhere provides
 * a consistent interface for CXFS across different platforms.
 *
 * There is currently no limit on the number of irec's (extent lists)
 * allowed, so heavily fragmented files may require an indirection array
 * which spans multiple system pages of memory. The number of extents
 * which would require this amount of contiguous memory is very large
 * and should not cause problems in the foreseeable future. However,
 * if the memory needed for the contiguous array ever becomes a problem,
 * it is possible that a third level of indirection may be required.
 */
typedef struct xfs_ext_irec {
    xfs_bmbt_rec_host_t *er_extbuf; /* block of extent records */
    xfs_extnum_t    er_extoff;  /* extent offset in file */
    xfs_extnum_t    er_extcount;    /* number of extents in page/block */
} xfs_ext_irec_t;

/*
 * File incore extent information, present for each of data & attr forks.
 */
#define XFS_IEXT_BUFSZ      4096
#define XFS_LINEAR_EXTS     (XFS_IEXT_BUFSZ / (uint)sizeof(xfs_bmbt_rec_t))
#define XFS_INLINE_EXTS     2
#define XFS_INLINE_DATA     32
typedef struct xfs_ifork {
    int         if_bytes;   /* bytes in if_u1 */
    int         if_real_bytes;  /* bytes allocated in if_u1 */
    struct xfs_btree_block  *if_broot;  /* file's incore btree root */
    short           if_broot_bytes; /* bytes allocated for root */
    unsigned char       if_flags;   /* per-fork flags */
    union {
        xfs_bmbt_rec_host_t *if_extents;/* linear map file exts */
        xfs_ext_irec_t  *if_ext_irec;   /* irec map file exts */
        char        *if_data;   /* inline file data */
    } if_u1;
    union {
        xfs_bmbt_rec_host_t if_inline_ext[XFS_INLINE_EXTS];
                        /* very small file extents */
        char        if_inline_data[XFS_INLINE_DATA];
                        /* very small file data */
        xfs_dev_t   if_rdev;    /* dev number if special */
        uuid_t      if_uuid;    /* mount point value */
    } if_u2;
} xfs_ifork_t;

/*
 * Inode location information.  Stored in the inode and passed to
 * xfs_imap_to_bp() to get a buffer and dinode for a given inode.
 */
struct xfs_imap {
    xfs_daddr_t im_blkno;   /* starting BB of inode chunk */
    ushort      im_len;     /* length in BBs of inode chunk */
    ushort      im_boffset; /* inode offset in block in bytes */
};

/*
 * This is the xfs in-core inode structure.
 * Most of the on-disk inode is embedded in the i_d field.
 *
 * The extent pointers/inline file space, however, are managed
 * separately.  The memory for this information is pointed to by
 * the if_u1 unions depending on the type of the data.
 * This is used to linearize the array of extents for fast in-core
 * access.  This is used until the file's number of extents
 * surpasses XFS_MAX_INCORE_EXTENTS, at which point all extent pointers
 * are accessed through the buffer cache.
 *
 * Other state kept in the in-core inode is used for identification,
 * locking, transactional updating, etc of the inode.
 *
 * Generally, we do not want to hold the i_rlock while holding the
 * i_ilock. Hierarchy is i_iolock followed by i_rlock.
 *
 * xfs_iptr_t contains all the inode fields up to and including the
 * i_mnext and i_mprev fields, it is used as a marker in the inode
 * chain off the mount structure by xfs_sync calls.
 */

typedef struct xfs_ictimestamp {
    __int32_t   t_sec;      /* timestamp seconds */
    __int32_t   t_nsec;     /* timestamp nanoseconds */
} xfs_ictimestamp_t;

/*
 * NOTE:  This structure must be kept identical to struct xfs_dinode
 *    in xfs_dinode.h except for the endianness annotations.
 */
typedef struct xfs_icdinode {
    __uint16_t  di_magic;   /* inode magic # = XFS_DINODE_MAGIC */
    __uint16_t  di_mode;    /* mode and type of file */
    __int8_t    di_version; /* inode version */
    __int8_t    di_format;  /* format of di_c data */
    __uint16_t  di_onlink;  /* old number of links to file */
    __uint32_t  di_uid;     /* owner's user id */
    __uint32_t  di_gid;     /* owner's group id */
    __uint32_t  di_nlink;   /* number of links to file */
    __uint16_t  di_projid_lo;   /* lower part of owner's project id */
    __uint16_t  di_projid_hi;   /* higher part of owner's project id */
    __uint8_t   di_pad[6];  /* unused, zeroed space */
    __uint16_t  di_flushiter;   /* incremented on flush */
    xfs_ictimestamp_t di_atime; /* time last accessed */
    xfs_ictimestamp_t di_mtime; /* time last modified */
    xfs_ictimestamp_t di_ctime; /* time created/inode modified */
    xfs_fsize_t di_size;    /* number of bytes in file */
    xfs_drfsbno_t   di_nblocks; /* # of direct & btree blocks used */
    xfs_extlen_t    di_extsize; /* basic/minimum extent size for file */
    xfs_extnum_t    di_nextents;    /* number of extents in data fork */
    xfs_aextnum_t   di_anextents;   /* number of extents in attribute fork*/
    __uint8_t   di_forkoff; /* attr fork offs, <<3 for 64b align */
    __int8_t    di_aformat; /* format of attr fork's data */
    __uint32_t  di_dmevmask;    /* DMIG event mask */
    __uint16_t  di_dmstate; /* DMIG state info */
    __uint16_t  di_flags;   /* random flags, XFS_DIFLAG_... */
    __uint32_t  di_gen;     /* generation number */
} xfs_icdinode_t;

/*
 * Flags for xfs_ichgtime().
 */
#define XFS_ICHGTIME_MOD    0x1 /* data fork modification timestamp */
#define XFS_ICHGTIME_CHG    0x2 /* inode field change timestamp */

/*
 * Per-fork incore inode flags.
 */
#define XFS_IFINLINE    0x01    /* Inline data is read in */
#define XFS_IFEXTENTS   0x02    /* All extent pointers are read in */
#define XFS_IFBROOT 0x04    /* i_broot points to the bmap b-tree root */
#define XFS_IFEXTIREC   0x08    /* Indirection array of extent blocks */

/*
 * Fork handling.
 */

#define XFS_IFORK_Q(ip)         ((ip)->i_d.di_forkoff != 0)
#define XFS_IFORK_BOFF(ip)      ((int)((ip)->i_d.di_forkoff << 3))

#define XFS_IFORK_PTR(ip,w)     \
    ((w) == XFS_DATA_FORK ? \
        &(ip)->i_df : \
        (ip)->i_afp)
#define XFS_IFORK_DSIZE(ip) \
    (XFS_IFORK_Q(ip) ? \
        XFS_IFORK_BOFF(ip) : \
        XFS_LITINO((ip)->i_mount))
#define XFS_IFORK_ASIZE(ip) \
    (XFS_IFORK_Q(ip) ? \
        XFS_LITINO((ip)->i_mount) - XFS_IFORK_BOFF(ip) : \
        0)
#define XFS_IFORK_SIZE(ip,w) \
    ((w) == XFS_DATA_FORK ? \
        XFS_IFORK_DSIZE(ip) : \
        XFS_IFORK_ASIZE(ip))
#define XFS_IFORK_FORMAT(ip,w) \
    ((w) == XFS_DATA_FORK ? \
        (ip)->i_d.di_format : \
        (ip)->i_d.di_aformat)
#define XFS_IFORK_FMT_SET(ip,w,n) \
    ((w) == XFS_DATA_FORK ? \
        ((ip)->i_d.di_format = (n)) : \
        ((ip)->i_d.di_aformat = (n)))
#define XFS_IFORK_NEXTENTS(ip,w) \
    ((w) == XFS_DATA_FORK ? \
        (ip)->i_d.di_nextents : \
        (ip)->i_d.di_anextents)
#define XFS_IFORK_NEXT_SET(ip,w,n) \
    ((w) == XFS_DATA_FORK ? \
        ((ip)->i_d.di_nextents = (n)) : \
        ((ip)->i_d.di_anextents = (n)))
#define XFS_IFORK_MAXEXT(ip, w) \
    (XFS_IFORK_SIZE(ip, w) / sizeof(xfs_bmbt_rec_t))


#ifdef __KERNEL__

struct xfs_buf;
struct xfs_bmap_free;
struct xfs_bmbt_irec;
struct xfs_inode_log_item;
struct xfs_mount;
struct xfs_trans;
struct xfs_dquot;

typedef struct xfs_inode {
    /* Inode linking and identification information. */
    struct xfs_mount    *i_mount;   /* fs mount struct ptr */
    struct xfs_dquot    *i_udquot;  /* user dquot */
    struct xfs_dquot    *i_gdquot;  /* group dquot */

    /* Inode location stuff */
    xfs_ino_t       i_ino;      /* inode number (agno/agino)*/
    struct xfs_imap     i_imap;     /* location for xfs_imap() */

    /* Extent information. */
    xfs_ifork_t     *i_afp;     /* attribute fork pointer */
    xfs_ifork_t     i_df;       /* data fork */

    /* Transaction and locking information. */
    struct xfs_inode_log_item *i_itemp; /* logging information */
    mrlock_t        i_lock;     /* inode lock */
    mrlock_t        i_iolock;   /* inode IO lock */
    atomic_t        i_pincount; /* inode pin count */
    spinlock_t      i_flags_lock;   /* inode i_flags lock */
    /* Miscellaneous state. */
    unsigned long       i_flags;    /* see defined flags below */
    unsigned int        i_delayed_blks; /* count of delay alloc blks */

    xfs_icdinode_t      i_d;        /* most of ondisk inode */

    /* VFS inode */
    struct inode        i_vnode;    /* embedded VFS inode */
} xfs_inode_t;

/* Convert from vfs inode to xfs inode */
static inline struct xfs_inode *XFS_I(struct inode *inode)
{
    return container_of(inode, struct xfs_inode, i_vnode);
}

/* convert from xfs inode to vfs inode */
static inline struct inode *VFS_I(struct xfs_inode *ip)
{
    return &ip->i_vnode;
}

/*
 * For regular files we only update the on-disk filesize when actually
 * writing data back to disk.  Until then only the copy in the VFS inode
 * is uptodate.
 */
static inline xfs_fsize_t XFS_ISIZE(struct xfs_inode *ip)
{
    if (S_ISREG(ip->i_d.di_mode))
        return i_size_read(VFS_I(ip));
    return ip->i_d.di_size;
}

/*
 * If this I/O goes past the on-disk inode size update it unless it would
 * be past the current in-core inode size.
 */
static inline xfs_fsize_t
xfs_new_eof(struct xfs_inode *ip, xfs_fsize_t new_size)
{
    xfs_fsize_t i_size = i_size_read(VFS_I(ip));

    if (new_size > i_size)
        new_size = i_size;
    return new_size > ip->i_d.di_size ? new_size : 0;
}

/*
 * i_flags helper functions
 */
static inline void
__xfs_iflags_set(xfs_inode_t *ip, unsigned short flags)
{
    ip->i_flags |= flags;
}

static inline void
xfs_iflags_set(xfs_inode_t *ip, unsigned short flags)
{
    spin_lock(&ip->i_flags_lock);
    __xfs_iflags_set(ip, flags);
    spin_unlock(&ip->i_flags_lock);
}

static inline void
xfs_iflags_clear(xfs_inode_t *ip, unsigned short flags)
{
    spin_lock(&ip->i_flags_lock);
    ip->i_flags &= ~flags;
    spin_unlock(&ip->i_flags_lock);
}

static inline int
__xfs_iflags_test(xfs_inode_t *ip, unsigned short flags)
{
    return (ip->i_flags & flags);
}

static inline int
xfs_iflags_test(xfs_inode_t *ip, unsigned short flags)
{
    int ret;
    spin_lock(&ip->i_flags_lock);
    ret = __xfs_iflags_test(ip, flags);
    spin_unlock(&ip->i_flags_lock);
    return ret;
}

static inline int
xfs_iflags_test_and_clear(xfs_inode_t *ip, unsigned short flags)
{
    int ret;

    spin_lock(&ip->i_flags_lock);
    ret = ip->i_flags & flags;
    if (ret)
        ip->i_flags &= ~flags;
    spin_unlock(&ip->i_flags_lock);
    return ret;
}

static inline int
xfs_iflags_test_and_set(xfs_inode_t *ip, unsigned short flags)
{
    int ret;

    spin_lock(&ip->i_flags_lock);
    ret = ip->i_flags & flags;
    if (!ret)
        ip->i_flags |= flags;
    spin_unlock(&ip->i_flags_lock);
    return ret;
}

/*
 * Project quota id helpers (previously projid was 16bit only
 * and using two 16bit values to hold new 32bit projid was chosen
 * to retain compatibility with "old" filesystems).
 */
static inline prid_t
xfs_get_projid(struct xfs_inode *ip)
{
    return (prid_t)ip->i_d.di_projid_hi << 16 | ip->i_d.di_projid_lo;
}

static inline void
xfs_set_projid(struct xfs_inode *ip,
        prid_t projid)
{
    ip->i_d.di_projid_hi = (__uint16_t) (projid >> 16);
    ip->i_d.di_projid_lo = (__uint16_t) (projid & 0xffff);
}

/*
 * In-core inode flags.
 */
#define XFS_IRECLAIM        (1 << 0) /* started reclaiming this inode */
#define XFS_ISTALE      (1 << 1) /* inode has been staled */
#define XFS_IRECLAIMABLE    (1 << 2) /* inode can be reclaimed */
#define XFS_INEW        (1 << 3) /* inode has just been allocated */
#define XFS_IFILESTREAM     (1 << 4) /* inode is in a filestream dir. */
#define XFS_ITRUNCATED      (1 << 5) /* truncated down so flush-on-close */
#define XFS_IDIRTY_RELEASE  (1 << 6) /* dirty release already seen */
#define __XFS_IFLOCK_BIT    7    /* inode is being flushed right now */
#define XFS_IFLOCK      (1 << __XFS_IFLOCK_BIT)
#define __XFS_IPINNED_BIT   8    /* wakeup key for zero pin count */
#define XFS_IPINNED     (1 << __XFS_IPINNED_BIT)
#define XFS_IDONTCACHE      (1 << 9) /* don't cache the inode long term */

/*
 * Per-lifetime flags need to be reset when re-using a reclaimable inode during
 * inode lookup. This prevents unintended behaviour on the new inode from
 * ocurring.
 */
#define XFS_IRECLAIM_RESET_FLAGS    \
    (XFS_IRECLAIMABLE | XFS_IRECLAIM | \
     XFS_IDIRTY_RELEASE | XFS_ITRUNCATED | \
     XFS_IFILESTREAM);

/*
 * Synchronize processes attempting to flush the in-core inode back to disk.
 */

extern void __xfs_iflock(struct xfs_inode *ip);

static inline int xfs_iflock_nowait(struct xfs_inode *ip)
{
    return !xfs_iflags_test_and_set(ip, XFS_IFLOCK);
}

static inline void xfs_iflock(struct xfs_inode *ip)
{
    if (!xfs_iflock_nowait(ip))
        __xfs_iflock(ip);
}

static inline void xfs_ifunlock(struct xfs_inode *ip)
{
    xfs_iflags_clear(ip, XFS_IFLOCK);
    wake_up_bit(&ip->i_flags, __XFS_IFLOCK_BIT);
}

static inline int xfs_isiflocked(struct xfs_inode *ip)
{
    return xfs_iflags_test(ip, XFS_IFLOCK);
}

/*
 * Flags for inode locking.
 * Bit ranges:  1<<1  - 1<<16-1 -- iolock/ilock modes (bitfield)
 *      1<<16 - 1<<32-1 -- lockdep annotation (integers)
 */
#define XFS_IOLOCK_EXCL     (1<<0)
#define XFS_IOLOCK_SHARED   (1<<1)
#define XFS_ILOCK_EXCL      (1<<2)
#define XFS_ILOCK_SHARED    (1<<3)

#define XFS_LOCK_MASK       (XFS_IOLOCK_EXCL | XFS_IOLOCK_SHARED \
                | XFS_ILOCK_EXCL | XFS_ILOCK_SHARED)

#define XFS_LOCK_FLAGS \
    { XFS_IOLOCK_EXCL,  "IOLOCK_EXCL" }, \
    { XFS_IOLOCK_SHARED,    "IOLOCK_SHARED" }, \
    { XFS_ILOCK_EXCL,   "ILOCK_EXCL" }, \
    { XFS_ILOCK_SHARED, "ILOCK_SHARED" }


/*
 * Flags for lockdep annotations.
 *
 * XFS_LOCK_PARENT - for directory operations that require locking a
 * parent directory inode and a child entry inode.  The parent gets locked
 * with this flag so it gets a lockdep subclass of 1 and the child entry
 * lock will have a lockdep subclass of 0.
 *
 * XFS_LOCK_RTBITMAP/XFS_LOCK_RTSUM - the realtime device bitmap and summary
 * inodes do not participate in the normal lock order, and thus have their
 * own subclasses.
 *
 * XFS_LOCK_INUMORDER - for locking several inodes at the some time
 * with xfs_lock_inodes().  This flag is used as the starting subclass
 * and each subsequent lock acquired will increment the subclass by one.
 * So the first lock acquired will have a lockdep subclass of 4, the
 * second lock will have a lockdep subclass of 5, and so on. It is
 * the responsibility of the class builder to shift this to the correct
 * portion of the lock_mode lockdep mask.
 */
#define XFS_LOCK_PARENT     1
#define XFS_LOCK_RTBITMAP   2
#define XFS_LOCK_RTSUM      3
#define XFS_LOCK_INUMORDER  4

#define XFS_IOLOCK_SHIFT    16
#define XFS_IOLOCK_PARENT   (XFS_LOCK_PARENT << XFS_IOLOCK_SHIFT)

#define XFS_ILOCK_SHIFT     24
#define XFS_ILOCK_PARENT    (XFS_LOCK_PARENT << XFS_ILOCK_SHIFT)
#define XFS_ILOCK_RTBITMAP  (XFS_LOCK_RTBITMAP << XFS_ILOCK_SHIFT)
#define XFS_ILOCK_RTSUM     (XFS_LOCK_RTSUM << XFS_ILOCK_SHIFT)

#define XFS_IOLOCK_DEP_MASK 0x00ff0000
#define XFS_ILOCK_DEP_MASK  0xff000000
#define XFS_LOCK_DEP_MASK   (XFS_IOLOCK_DEP_MASK | XFS_ILOCK_DEP_MASK)

#define XFS_IOLOCK_DEP(flags)   (((flags) & XFS_IOLOCK_DEP_MASK) >> XFS_IOLOCK_SHIFT)
#define XFS_ILOCK_DEP(flags)    (((flags) & XFS_ILOCK_DEP_MASK) >> XFS_ILOCK_SHIFT)

/*
 * For multiple groups support: if S_ISGID bit is set in the parent
 * directory, group of new file is set to that of the parent, and
 * new subdirectory gets S_ISGID bit from parent.
 */
#define XFS_INHERIT_GID(pip)    \
    (((pip)->i_mount->m_flags & XFS_MOUNT_GRPID) || \
     ((pip)->i_d.di_mode & S_ISGID))

/*
 * xfs_iget.c prototypes.
 */
int     xfs_iget(struct xfs_mount *, struct xfs_trans *, xfs_ino_t,
             uint, uint, xfs_inode_t **);
void        xfs_ilock(xfs_inode_t *, uint);
int     xfs_ilock_nowait(xfs_inode_t *, uint);
void        xfs_iunlock(xfs_inode_t *, uint);
void        xfs_ilock_demote(xfs_inode_t *, uint);
int     xfs_isilocked(xfs_inode_t *, uint);
uint        xfs_ilock_map_shared(xfs_inode_t *);
void        xfs_iunlock_map_shared(xfs_inode_t *, uint);
void        xfs_inode_free(struct xfs_inode *ip);

/*
 * xfs_inode.c prototypes.
 */
int     xfs_ialloc(struct xfs_trans *, xfs_inode_t *, umode_t,
               xfs_nlink_t, xfs_dev_t, prid_t, int,
               struct xfs_buf **, xfs_inode_t **);

uint        xfs_ip2xflags(struct xfs_inode *);
uint        xfs_dic2xflags(struct xfs_dinode *);
int     xfs_ifree(struct xfs_trans *, xfs_inode_t *,
               struct xfs_bmap_free *);
int     xfs_itruncate_extents(struct xfs_trans **, struct xfs_inode *,
                      int, xfs_fsize_t);
int     xfs_iunlink(struct xfs_trans *, xfs_inode_t *);

void        xfs_iext_realloc(xfs_inode_t *, int, int);
void        xfs_iunpin_wait(xfs_inode_t *);
int     xfs_iflush(struct xfs_inode *, struct xfs_buf **);
void        xfs_lock_inodes(xfs_inode_t **, int, uint);
void        xfs_lock_two_inodes(xfs_inode_t *, xfs_inode_t *, uint);

xfs_extlen_t    xfs_get_extsz_hint(struct xfs_inode *ip);

#define IHOLD(ip) \
do { \
    ASSERT(atomic_read(&VFS_I(ip)->i_count) > 0) ; \
    ihold(VFS_I(ip)); \
    trace_xfs_ihold(ip, _THIS_IP_); \
} while (0)

#define IRELE(ip) \
do { \
    trace_xfs_irele(ip, _THIS_IP_); \
    iput(VFS_I(ip)); \
} while (0)

#endif /* __KERNEL__ */

/*
 * Flags for xfs_iget()
 */
#define XFS_IGET_CREATE     0x1
#define XFS_IGET_UNTRUSTED  0x2
#define XFS_IGET_DONTCACHE  0x4

int     xfs_imap_to_bp(struct xfs_mount *, struct xfs_trans *,
                   struct xfs_imap *, struct xfs_dinode **,
                   struct xfs_buf **, uint, uint);
int     xfs_iread(struct xfs_mount *, struct xfs_trans *,
              struct xfs_inode *, uint);
void        xfs_dinode_to_disk(struct xfs_dinode *,
                   struct xfs_icdinode *);
void        xfs_idestroy_fork(struct xfs_inode *, int);
void        xfs_idata_realloc(struct xfs_inode *, int, int);
void        xfs_iroot_realloc(struct xfs_inode *, int, int);
int     xfs_iread_extents(struct xfs_trans *, struct xfs_inode *, int);
int     xfs_iextents_copy(struct xfs_inode *, xfs_bmbt_rec_t *, int);

xfs_bmbt_rec_host_t *xfs_iext_get_ext(xfs_ifork_t *, xfs_extnum_t);
void        xfs_iext_insert(xfs_inode_t *, xfs_extnum_t, xfs_extnum_t,
                xfs_bmbt_irec_t *, int);
void        xfs_iext_add(xfs_ifork_t *, xfs_extnum_t, int);
void        xfs_iext_add_indirect_multi(xfs_ifork_t *, int, xfs_extnum_t, int);
void        xfs_iext_remove(xfs_inode_t *, xfs_extnum_t, int, int);
void        xfs_iext_remove_inline(xfs_ifork_t *, xfs_extnum_t, int);
void        xfs_iext_remove_direct(xfs_ifork_t *, xfs_extnum_t, int);
void        xfs_iext_remove_indirect(xfs_ifork_t *, xfs_extnum_t, int);
void        xfs_iext_realloc_direct(xfs_ifork_t *, int);
void        xfs_iext_direct_to_inline(xfs_ifork_t *, xfs_extnum_t);
void        xfs_iext_inline_to_direct(xfs_ifork_t *, int);
void        xfs_iext_destroy(xfs_ifork_t *);
xfs_bmbt_rec_host_t *xfs_iext_bno_to_ext(xfs_ifork_t *, xfs_fileoff_t, int *);
xfs_ext_irec_t  *xfs_iext_bno_to_irec(xfs_ifork_t *, xfs_fileoff_t, int *);
xfs_ext_irec_t  *xfs_iext_idx_to_irec(xfs_ifork_t *, xfs_extnum_t *, int *, int);
void        xfs_iext_irec_init(xfs_ifork_t *);
xfs_ext_irec_t *xfs_iext_irec_new(xfs_ifork_t *, int);
void        xfs_iext_irec_remove(xfs_ifork_t *, int);
void        xfs_iext_irec_compact(xfs_ifork_t *);
void        xfs_iext_irec_compact_pages(xfs_ifork_t *);
void        xfs_iext_irec_compact_full(xfs_ifork_t *);
void        xfs_iext_irec_update_extoffs(xfs_ifork_t *, int, int);

#define xfs_ipincount(ip)   ((unsigned int) atomic_read(&ip->i_pincount))

#if defined(DEBUG)
void        xfs_inobp_check(struct xfs_mount *, struct xfs_buf *);
#else
#define xfs_inobp_check(mp, bp)
#endif /* DEBUG */

extern struct kmem_zone *xfs_ifork_zone;
extern struct kmem_zone *xfs_inode_zone;
extern struct kmem_zone *xfs_ili_zone;

#endif  /* __XFS_INODE_H__ */