Author: avg Date: Fri Oct 30 12:00:34 2015 New Revision: 290191 URL: https://svnweb.freebsd.org/changeset/base/290191
Log: l2arc: do not call trim_map_free() for blocks with zero b_asize 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 <[email protected]> Tested by: Willem Jan Withagen <[email protected]> MFC after: 11 days Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c ============================================================================== --- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c Fri Oct 30 10:09:04 2015 (r290190) +++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c Fri Oct 30 12:00:34 2015 (r290191) @@ -1131,6 +1131,24 @@ static boolean_t l2arc_compress_buf(arc_ 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 @@ top: * 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); _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "[email protected]"
