Date: Tue, 19 Sep 2017 09:07:51 +0000 (UTC) From: Andriy Gapon <avg@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r323754 - stable/11/sys/cddl/contrib/opensolaris/uts/common/fs/zfs Message-ID: <201709190907.v8J97pxL052024@repo.freebsd.org>
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Author: avg Date: Tue Sep 19 09:07:51 2017 New Revision: 323754 URL: https://svnweb.freebsd.org/changeset/base/323754 Log: MFC r322222: MFV r322221: 7910 l2arc_write_buffers() may write beyond target_sz FreeBD note: the essence of this change was committed to FreeBSD in r314274. This commit catches up with differences between what was committed to FreeBSD and what was committed to OpenZFS, mainly more logical variable names. illumos/illumos-gate@16a7e5ac116c85d965007a5f201104b564e82210 https://github.com/illumos/illumos-gate/commit/16a7e5ac116c85d965007a5f201104b564e82210 https://www.illumos.org/issues/7910 It seems that the change in issue #6950 resurrected the problem that was earlier fixed by the change in issue #5219. Please also see the following FreeBSD bug report: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=216178 Reviewed by: George Wilson <george.wilson@delphix.com> Reviewed by: Dan Kimmel <dan.kimmel@delphix.com> Approved by: Robert Mustacchi <rm@joyent.com> Author: Andriy Gapon <avg@FreeBSD.org> Modified: stable/11/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c Directory Properties: stable/11/ (props changed) Modified: stable/11/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c ============================================================================== --- stable/11/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c Tue Sep 19 09:04:29 2017 (r323753) +++ stable/11/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c Tue Sep 19 09:07:51 2017 (r323754) @@ -722,8 +722,8 @@ typedef struct arc_stats { kstat_named_t arcstat_l2_abort_lowmem; kstat_named_t arcstat_l2_cksum_bad; kstat_named_t arcstat_l2_io_error; - kstat_named_t arcstat_l2_size; - kstat_named_t arcstat_l2_asize; + kstat_named_t arcstat_l2_lsize; + kstat_named_t arcstat_l2_psize; kstat_named_t arcstat_l2_hdr_size; kstat_named_t arcstat_l2_write_trylock_fail; kstat_named_t arcstat_l2_write_passed_headroom; @@ -3366,19 +3366,19 @@ arc_hdr_l2hdr_destroy(arc_buf_hdr_t *hdr) { l2arc_buf_hdr_t *l2hdr = &hdr->b_l2hdr; l2arc_dev_t *dev = l2hdr->b_dev; - uint64_t asize = arc_hdr_size(hdr); + uint64_t psize = arc_hdr_size(hdr); ASSERT(MUTEX_HELD(&dev->l2ad_mtx)); ASSERT(HDR_HAS_L2HDR(hdr)); list_remove(&dev->l2ad_buflist, hdr); - ARCSTAT_INCR(arcstat_l2_asize, -asize); - ARCSTAT_INCR(arcstat_l2_size, -HDR_GET_LSIZE(hdr)); + ARCSTAT_INCR(arcstat_l2_psize, -psize); + ARCSTAT_INCR(arcstat_l2_lsize, -HDR_GET_LSIZE(hdr)); - vdev_space_update(dev->l2ad_vdev, -asize, 0, 0); + vdev_space_update(dev->l2ad_vdev, -psize, 0, 0); - (void) refcount_remove_many(&dev->l2ad_alloc, asize, hdr); + (void) refcount_remove_many(&dev->l2ad_alloc, psize, hdr); arc_hdr_clear_flags(hdr, ARC_FLAG_HAS_L2HDR); } @@ -7081,8 +7081,8 @@ top: l2arc_trim(hdr); arc_hdr_clear_flags(hdr, ARC_FLAG_HAS_L2HDR); - ARCSTAT_INCR(arcstat_l2_asize, -arc_hdr_size(hdr)); - ARCSTAT_INCR(arcstat_l2_size, -HDR_GET_LSIZE(hdr)); + ARCSTAT_INCR(arcstat_l2_psize, -arc_hdr_size(hdr)); + ARCSTAT_INCR(arcstat_l2_lsize, -HDR_GET_LSIZE(hdr)); bytes_dropped += arc_hdr_size(hdr); (void) refcount_remove_many(&dev->l2ad_alloc, @@ -7338,7 +7338,7 @@ top: /* * This doesn't exist in the ARC. Destroy. * arc_hdr_destroy() will call list_remove() - * and decrement arcstat_l2_size. + * and decrement arcstat_l2_lsize. */ arc_change_state(arc_anon, hdr, hash_lock); arc_hdr_destroy(hdr); @@ -7377,7 +7377,7 @@ static uint64_t l2arc_write_buffers(spa_t *spa, l2arc_dev_t *dev, uint64_t target_sz) { arc_buf_hdr_t *hdr, *hdr_prev, *head; - uint64_t write_asize, write_psize, write_sz, headroom; + uint64_t write_asize, write_psize, write_lsize, headroom; boolean_t full; l2arc_write_callback_t *cb; zio_t *pio, *wzio; @@ -7387,7 +7387,7 @@ l2arc_write_buffers(spa_t *spa, l2arc_dev_t *dev, uint ASSERT3P(dev->l2ad_vdev, !=, NULL); pio = NULL; - write_sz = write_asize = write_psize = 0; + write_lsize = write_asize = write_psize = 0; full = B_FALSE; head = kmem_cache_alloc(hdr_l2only_cache, KM_PUSHPAGE); arc_hdr_set_flags(head, ARC_FLAG_L2_WRITE_HEAD | ARC_FLAG_HAS_L2HDR); @@ -7464,11 +7464,11 @@ l2arc_write_buffers(spa_t *spa, l2arc_dev_t *dev, uint ASSERT3U(HDR_GET_PSIZE(hdr), >, 0); ASSERT3P(hdr->b_l1hdr.b_pabd, !=, NULL); ASSERT3U(arc_hdr_size(hdr), >, 0); - uint64_t size = arc_hdr_size(hdr); + uint64_t psize = arc_hdr_size(hdr); uint64_t asize = vdev_psize_to_asize(dev->l2ad_vdev, - size); + psize); - if ((write_psize + asize) > target_sz) { + if ((write_asize + asize) > target_sz) { full = B_TRUE; mutex_exit(hash_lock); ARCSTAT_BUMP(arcstat_l2_write_full); @@ -7503,7 +7503,7 @@ l2arc_write_buffers(spa_t *spa, l2arc_dev_t *dev, uint list_insert_head(&dev->l2ad_buflist, hdr); mutex_exit(&dev->l2ad_mtx); - (void) refcount_add_many(&dev->l2ad_alloc, size, hdr); + (void) refcount_add_many(&dev->l2ad_alloc, psize, hdr); /* * Normally the L2ARC can use the hdr's data, but if @@ -7520,15 +7520,15 @@ l2arc_write_buffers(spa_t *spa, l2arc_dev_t *dev, uint * add it to the l2arc_free_on_write queue. */ abd_t *to_write; - if (!HDR_SHARED_DATA(hdr) && size == asize) { + if (!HDR_SHARED_DATA(hdr) && psize == asize) { to_write = hdr->b_l1hdr.b_pabd; } else { to_write = abd_alloc_for_io(asize, HDR_ISTYPE_METADATA(hdr)); - abd_copy(to_write, hdr->b_l1hdr.b_pabd, size); - if (asize != size) { - abd_zero_off(to_write, size, - asize - size); + abd_copy(to_write, hdr->b_l1hdr.b_pabd, psize); + if (asize != psize) { + abd_zero_off(to_write, psize, + asize - psize); } l2arc_free_abd_on_write(to_write, asize, arc_buf_type(hdr)); @@ -7539,12 +7539,12 @@ l2arc_write_buffers(spa_t *spa, l2arc_dev_t *dev, uint ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_CANFAIL, B_FALSE); - write_sz += HDR_GET_LSIZE(hdr); + write_lsize += HDR_GET_LSIZE(hdr); DTRACE_PROBE2(l2arc__write, vdev_t *, dev->l2ad_vdev, zio_t *, wzio); - write_asize += size; - write_psize += asize; + write_psize += psize; + write_asize += asize; dev->l2ad_hand += asize; mutex_exit(hash_lock); @@ -7560,7 +7560,7 @@ l2arc_write_buffers(spa_t *spa, l2arc_dev_t *dev, uint /* No buffers selected for writing? */ if (pio == NULL) { - ASSERT0(write_sz); + ASSERT0(write_lsize); ASSERT(!HDR_HAS_L1HDR(head)); kmem_cache_free(hdr_l2only_cache, head); return (0); @@ -7568,10 +7568,10 @@ l2arc_write_buffers(spa_t *spa, l2arc_dev_t *dev, uint ASSERT3U(write_psize, <=, target_sz); ARCSTAT_BUMP(arcstat_l2_writes_sent); - ARCSTAT_INCR(arcstat_l2_write_bytes, write_asize); - ARCSTAT_INCR(arcstat_l2_size, write_sz); - ARCSTAT_INCR(arcstat_l2_asize, write_asize); - vdev_space_update(dev->l2ad_vdev, write_asize, 0, 0); + ARCSTAT_INCR(arcstat_l2_write_bytes, write_psize); + ARCSTAT_INCR(arcstat_l2_lsize, write_lsize); + ARCSTAT_INCR(arcstat_l2_psize, write_psize); + vdev_space_update(dev->l2ad_vdev, write_psize, 0, 0); /* * Bump device hand to the device start if it is approaching the end.
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