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MFV r267569:

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4897 Space accounting mismatch in L2ARC/zpool

illumos/illumos-dist@3038a2b421

MFC after:	2 weeks
This commit is contained in:
Xin LI 2014-07-01 08:28:49 +00:00
commit 3a0f8ff95e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=268085
1 changed files with 13 additions and 5 deletions
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18
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c
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@ -22,7 +22,7 @@
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2013 by Delphix. All rights reserved.
* Copyright (c) 2014 by Saso Kiselkov. All rights reserved.
* Copyright 2013 Nexenta Systems, Inc. All rights reserved.
* Copyright 2014 Nexenta Systems, Inc. All rights reserved.
*/
/*
@ -1746,6 +1746,8 @@ arc_hdr_destroy(arc_buf_hdr_t *hdr)
list_remove(l2hdr->b_dev->l2ad_buflist, hdr);
ARCSTAT_INCR(arcstat_l2_size, -hdr->b_size);
ARCSTAT_INCR(arcstat_l2_asize, -l2hdr->b_asize);
vdev_space_update(l2hdr->b_dev->l2ad_vdev,
-l2hdr->b_asize, 0, 0);
kmem_free(l2hdr, sizeof (l2arc_buf_hdr_t));
if (hdr->b_state == arc_l2c_only)
l2arc_hdr_stat_remove();
@ -3699,6 +3701,8 @@ arc_release(arc_buf_t *buf, void *tag)
if (l2hdr) {
ARCSTAT_INCR(arcstat_l2_asize, -l2hdr->b_asize);
vdev_space_update(l2hdr->b_dev->l2ad_vdev,
-l2hdr->b_asize, 0, 0);
trim_map_free(l2hdr->b_dev->l2ad_vdev, l2hdr->b_daddr,
hdr->b_size, 0);
kmem_free(l2hdr, sizeof (l2arc_buf_hdr_t));
@ -4600,6 +4604,7 @@ l2arc_write_done(zio_t *zio)
arc_buf_hdr_t *head, *ab, *ab_prev;
l2arc_buf_hdr_t *abl2;
kmutex_t *hash_lock;
int64_t bytes_dropped = 0;
cb = zio->io_private;
ASSERT(cb != NULL);
@ -4647,6 +4652,7 @@ l2arc_write_done(zio_t *zio)
*/
list_remove(buflist, ab);
ARCSTAT_INCR(arcstat_l2_asize, -abl2->b_asize);
bytes_dropped += abl2->b_asize;
ab->b_l2hdr = NULL;
trim_map_free(abl2->b_dev->l2ad_vdev, abl2->b_daddr,
ab->b_size, 0);
@ -4667,6 +4673,8 @@ l2arc_write_done(zio_t *zio)
kmem_cache_free(hdr_cache, head);
mutex_exit(&l2arc_buflist_mtx);
vdev_space_update(dev->l2ad_vdev, -bytes_dropped, 0, 0);
l2arc_do_free_on_write();
kmem_free(cb, sizeof (l2arc_write_callback_t));
@ -4806,6 +4814,7 @@ l2arc_evict(l2arc_dev_t *dev, uint64_t distance, boolean_t all)
arc_buf_hdr_t *ab, *ab_prev;
kmutex_t *hash_lock;
uint64_t taddr;
int64_t bytes_evicted = 0;
buflist = dev->l2ad_buflist;
@ -4904,6 +4913,7 @@ l2arc_evict(l2arc_dev_t *dev, uint64_t distance, boolean_t all)
if (ab->b_l2hdr != NULL) {
abl2 = ab->b_l2hdr;
ARCSTAT_INCR(arcstat_l2_asize, -abl2->b_asize);
bytes_evicted += abl2->b_asize;
ab->b_l2hdr = NULL;
kmem_free(abl2, sizeof (l2arc_buf_hdr_t));
ARCSTAT_INCR(arcstat_l2_size, -ab->b_size);
@ -4920,7 +4930,7 @@ l2arc_evict(l2arc_dev_t *dev, uint64_t distance, boolean_t all)
}
mutex_exit(&l2arc_buflist_mtx);
vdev_space_update(dev->l2ad_vdev, -(taddr - dev->l2ad_evict), 0, 0);
vdev_space_update(dev->l2ad_vdev, -bytes_evicted, 0, 0);
dev->l2ad_evict = taddr;
}
@ -5173,15 +5183,13 @@ l2arc_write_buffers(spa_t *spa, l2arc_dev_t *dev, uint64_t target_sz,
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_psize, 0, 0);
vdev_space_update(dev->l2ad_vdev, write_asize, 0, 0);
/*
* Bump device hand to the device start if it is approaching the end.
* l2arc_evict() will already have evicted ahead for this case.
*/
if (dev->l2ad_hand >= (dev->l2ad_end - target_sz)) {
vdev_space_update(dev->l2ad_vdev,
dev->l2ad_end - dev->l2ad_hand, 0, 0);
dev->l2ad_hand = dev->l2ad_start;
dev->l2ad_evict = dev->l2ad_start;
dev->l2ad_first = B_FALSE;