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Readd zfs_holey() from OpenSolaris

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This patch restores the zfs_holey() function from OpenSolaris.
This was removed by commit 3558fd7 because it wasn't clear we
had a use for it in ZoL.  However, this functionality is a
prerequisite for adding SEEK_DATA/SEEK_HOLE support to the ZPL.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Richard Yao <ryao@gentoo.org>
Issue #1384
This commit is contained in:
Matthew Ahrens 2013-07-01 09:24:43 -07:00 committed by Brian Behlendorf
parent 0a6bef26ec
commit cf91b2b6b2
1 changed files with 45 additions and 0 deletions
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45
module/zfs/zfs_vnops.c
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@ -240,6 +240,51 @@ zfs_close(struct inode *ip, int flag, cred_t *cr)
}
EXPORT_SYMBOL(zfs_close);
#if 0
/*
* Lseek support for finding holes (cmd == _FIO_SEEK_HOLE) and
* data (cmd == _FIO_SEEK_DATA). "off" is an in/out parameter.
*/
static int
zfs_holey(vnode_t *vp, int cmd, offset_t *off)
{
znode_t *zp = VTOZ(vp);
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 == _FIO_SEEK_HOLE)
hole = B_TRUE;
else
hole = B_FALSE;
error = dmu_offset_next(zp->z_zfsvfs->z_os, zp->z_id, hole, &noff);
/* end of file? */
if ((error == ESRCH) || (noff > file_sz)) {
/*
* Handle the virtual hole at the end of file.
*/
if (hole) {
*off = file_sz;
return (0);
}
return (SET_ERROR(ENXIO));
}
if (noff < *off)
return (error);
*off = noff;
return (error);
}
#endif
#if defined(_KERNEL)
/*
* When a file is memory mapped, we must keep the IO data synchronized