diff options
Diffstat (limited to 'module/zfs/zfs_vnops.c')
| -rw-r--r-- | module/zfs/zfs_vnops.c | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/module/zfs/zfs_vnops.c b/module/zfs/zfs_vnops.c index 9029f83c3..83e08630b 100644 --- a/module/zfs/zfs_vnops.c +++ b/module/zfs/zfs_vnops.c @@ -74,6 +74,96 @@ zfs_fsync(znode_t *zp, int syncflag, cred_t *cr) return (0); } + +#if defined(SEEK_HOLE) && defined(SEEK_DATA) +/* + * Lseek support for finding holes (cmd == SEEK_HOLE) and + * data (cmd == SEEK_DATA). "off" is an in/out parameter. + */ +static int +zfs_holey_common(znode_t *zp, ulong_t cmd, loff_t *off) +{ + uint64_t noff = (uint64_t)*off; /* new offset */ + uint64_t file_sz; + int error; + boolean_t hole; + + file_sz = zp->z_size; + if (noff >= file_sz) { + return (SET_ERROR(ENXIO)); + } + + if (cmd == F_SEEK_HOLE) + hole = B_TRUE; + else + hole = B_FALSE; + + error = dmu_offset_next(ZTOZSB(zp)->z_os, zp->z_id, hole, &noff); + + if (error == ESRCH) + return (SET_ERROR(ENXIO)); + + /* file was dirty, so fall back to using generic logic */ + if (error == EBUSY) { + if (hole) + *off = file_sz; + + return (0); + } + + /* + * We could find a hole that begins after the logical end-of-file, + * because dmu_offset_next() only works on whole blocks. If the + * EOF falls mid-block, then indicate that the "virtual hole" + * at the end of the file begins at the logical EOF, rather than + * at the end of the last block. + */ + if (noff > file_sz) { + ASSERT(hole); + noff = file_sz; + } + + if (noff < *off) + return (error); + *off = noff; + return (error); +} + +int +zfs_holey(znode_t *zp, ulong_t cmd, loff_t *off) +{ + zfsvfs_t *zfsvfs = ZTOZSB(zp); + int error; + + ZFS_ENTER(zfsvfs); + ZFS_VERIFY_ZP(zp); + + error = zfs_holey_common(zp, cmd, off); + + ZFS_EXIT(zfsvfs); + return (error); +} +#endif /* SEEK_HOLE && SEEK_DATA */ + +/*ARGSUSED*/ +int +zfs_access(znode_t *zp, int mode, int flag, cred_t *cr) +{ + zfsvfs_t *zfsvfs = ZTOZSB(zp); + int error; + + ZFS_ENTER(zfsvfs); + ZFS_VERIFY_ZP(zp); + + if (flag & V_ACE_MASK) + error = zfs_zaccess(zp, mode, flag, B_FALSE, cr); + else + error = zfs_zaccess_rwx(zp, mode, flag, cr); + + ZFS_EXIT(zfsvfs); + return (error); +} + static unsigned long zfs_vnops_read_chunk_size = 1024 * 1024; /* Tunable */ /* @@ -637,7 +727,9 @@ zfs_setsecattr(znode_t *zp, vsecattr_t *vsecp, int flag, cred_t *cr) return (error); } +EXPORT_SYMBOL(zfs_access); EXPORT_SYMBOL(zfs_fsync); +EXPORT_SYMBOL(zfs_holey); EXPORT_SYMBOL(zfs_read); EXPORT_SYMBOL(zfs_write); EXPORT_SYMBOL(zfs_getsecattr); |