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l2arc: do not call trim_map_free() for blocks with zero b_asize

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b_asize can be zero if the block is compressed into an empty block
(ZIO_COMPRESS_EMPTY) and the trim code asserts that meaningless
zero-sized trimming is not attempted.
The logic for calling trim_map_free() is extracted into a new function
l2arc_trim() to minimize code duplication.

PR:		203473
Reported by:	Willem Jan Withagen <wjw@digiware.nl>
Tested by:	Willem Jan Withagen <wjw@digiware.nl>
MFC after:	11 days
This commit is contained in:
avg 2015-10-30 12:00:34 +00:00
parent 0cf826b2c1
commit 2b14b99e0a
1 changed files with 21 additions and 10 deletions
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31
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c
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@ -1131,6 +1131,24 @@ static boolean_t l2arc_compress_buf(arc_buf_hdr_t *);
static void l2arc_decompress_zio(zio_t *, arc_buf_hdr_t *, enum zio_compress);
static void l2arc_release_cdata_buf(arc_buf_hdr_t *);
static void
l2arc_trim(const arc_buf_hdr_t *hdr)
{
l2arc_dev_t *dev = hdr->b_l2hdr.b_dev;
ASSERT(HDR_HAS_L2HDR(hdr));
ASSERT(MUTEX_HELD(&dev->l2ad_mtx));
if (hdr->b_l2hdr.b_daddr == L2ARC_ADDR_UNSET)
return;
if (hdr->b_l2hdr.b_asize != 0) {
trim_map_free(dev->l2ad_vdev, hdr->b_l2hdr.b_daddr,
hdr->b_l2hdr.b_asize, 0);
} else {
ASSERT3U(hdr->b_l2hdr.b_compress, ==, ZIO_COMPRESS_EMPTY);
}
}
static uint64_t
buf_hash(uint64_t spa, const dva_t *dva, uint64_t birth)
{
@ -2403,10 +2421,7 @@ arc_hdr_destroy(arc_buf_hdr_t *hdr)
* want to re-destroy the header's L2 portion.
*/
if (HDR_HAS_L2HDR(hdr)) {
if (hdr->b_l2hdr.b_daddr != L2ARC_ADDR_UNSET)
trim_map_free(dev->l2ad_vdev,
hdr->b_l2hdr.b_daddr,
hdr->b_l2hdr.b_asize, 0);
l2arc_trim(hdr);
arc_hdr_l2hdr_destroy(hdr);
}
@ -4776,10 +4791,7 @@ arc_release(arc_buf_t *buf, void *tag)
* to acquire the l2ad_mtx.
*/
if (HDR_HAS_L2HDR(hdr)) {
if (hdr->b_l2hdr.b_daddr != L2ARC_ADDR_UNSET)
trim_map_free(hdr->b_l2hdr.b_dev->l2ad_vdev,
hdr->b_l2hdr.b_daddr,
hdr->b_l2hdr.b_asize, 0);
l2arc_trim(hdr);
arc_hdr_l2hdr_destroy(hdr);
}
@ -5966,8 +5978,7 @@ l2arc_write_done(zio_t *zio)
* Error - drop L2ARC entry.
*/
list_remove(buflist, hdr);
trim_map_free(hdr->b_l2hdr.b_dev->l2ad_vdev,
hdr->b_l2hdr.b_daddr, hdr->b_l2hdr.b_asize, 0);
l2arc_trim(hdr);
hdr->b_flags &= ~ARC_FLAG_HAS_L2HDR;
ARCSTAT_INCR(arcstat_l2_asize, -hdr->b_l2hdr.b_asize);