Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

ZFS Encryption #4329

wants to merge 10 commits into from

fix for small race condition in arc.c that would occasionally trigger…

… assert
  • Loading branch information...
tcaputi committed Jan 17, 2017
commit 2b761791ebb32d8641a826bf28623e31d0da6910
@@ -3204,12 +3204,6 @@ arc_hdr_realloc_crypt(arc_buf_hdr_t *hdr, boolean_t encrypt)
nhdr = kmem_cache_alloc(ncache, KM_PUSHPAGE);
bcopy(hdr, nhdr, HDR_L2ONLY_SIZE);
nhdr->b_l1hdr.b_freeze_cksum = hdr->b_l1hdr.b_freeze_cksum;

nhdr->b_l1hdr.b_buf = hdr->b_l1hdr.b_buf;
for (buf = nhdr->b_l1hdr.b_buf; buf != NULL; buf = buf->b_next) {
buf->b_hdr = nhdr;

nhdr->b_l1hdr.b_bufcnt = hdr->b_l1hdr.b_bufcnt;
nhdr->b_l1hdr.b_byteswap = hdr->b_l1hdr.b_byteswap;
nhdr->b_l1hdr.b_state = hdr->b_l1hdr.b_state;
@@ -3219,9 +3213,25 @@ arc_hdr_realloc_crypt(arc_buf_hdr_t *hdr, boolean_t encrypt)
nhdr->b_l1hdr.b_mfu_hits = hdr->b_l1hdr.b_mfu_hits;
nhdr->b_l1hdr.b_mfu_ghost_hits = hdr->b_l1hdr.b_mfu_ghost_hits;
nhdr->b_l1hdr.b_l2_hits = hdr->b_l1hdr.b_l2_hits;
refcount_transfer(&nhdr->b_l1hdr.b_refcnt, &hdr->b_l1hdr.b_refcnt);
nhdr->b_l1hdr.b_acb = hdr->b_l1hdr.b_acb;
nhdr->b_l1hdr.b_pabd = hdr->b_l1hdr.b_pabd;
nhdr->b_l1hdr.b_buf = hdr->b_l1hdr.b_buf;

* This refcount_add() exists only to ensure that the individual
* arc buffers always point to a header that is referenced, avoiding
* a small race condition that could trigger ASSERTs.
(void) refcount_add(&nhdr->b_l1hdr.b_refcnt, FTAG);

for (buf = nhdr->b_l1hdr.b_buf; buf != NULL; buf = buf->b_next) {
buf->b_hdr = nhdr;

refcount_transfer(&nhdr->b_l1hdr.b_refcnt, &hdr->b_l1hdr.b_refcnt);
(void) refcount_remove(&nhdr->b_l1hdr.b_refcnt, FTAG);

if (encrypt) {
arc_hdr_set_flags(nhdr, ARC_FLAG_ENCRYPT);
ProTip! Use n and p to navigate between commits in a pull request.
You can’t perform that action at this time.