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Add more constraints for block cloning.

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- We cannot clone into files with smaller block size if there is
more than one block, since we can not grow the block size.
 - Block size must be power-of-2 if destination offset != 0, since
there can be no multiple blocks of non-power-of-2 size.

The first should handle the case when destination file has several
blocks but still is not bigger than one block of the source file.
The second fixes panic in dmu_buf_hold_array_by_dnode() on attempt
to concatenate files with equal but non-power-of-2 block sizes.

While there, assert that error is reported if we made no progress.

Signed-off-by:	Alexander Motin <mav@FreeBSD.org>
Sponsored by:	iXsystems, Inc.
This commit is contained in:
Alexander Motin 2023-09-08 17:25:43 -04:00 committed by Brian Behlendorf
parent 739db06ce7
commit e96fbdba34
1 changed files with 19 additions and 2 deletions
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21
module/zfs/zfs_vnops.c
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@ -1172,9 +1172,20 @@ zfs_clone_range(znode_t *inzp, uint64_t *inoffp, znode_t *outzp,
inblksz = inzp->z_blksz;
/*
* We cannot clone into files with different block size.
* We cannot clone into files with different block size if we can't
* grow it (block size is already bigger or more than one block).
*/
if (inblksz != outzp->z_blksz && outzp->z_size > inblksz) {
if (inblksz != outzp->z_blksz && (outzp->z_size > outzp->z_blksz ||
outzp->z_size > inblksz)) {
error = SET_ERROR(EINVAL);
goto unlock;
}
/*
* Block size must be power-of-2 if destination offset != 0.
* There can be no multiple blocks of non-power-of-2 size.
*/
if (outoff != 0 && !ISP2(inblksz)) {
error = SET_ERROR(EINVAL);
goto unlock;
}
@ -1358,6 +1369,12 @@ unlock:
*inoffp += done;
*outoffp += done;
*lenp = done;
} else {
/*
* If we made no progress, there must be a good reason.
* EOF is handled explicitly above, before the loop.
*/
ASSERT3S(error, !=, 0);
}
zfs_exit_two(inzfsvfs, outzfsvfs, FTAG);