The patch titled Subject: ocfs2: ac->ac_allow_chain_relink=0 won't disable group relink has been removed from the -mm tree. Its filename was ocfs2-ac-ac_allow_chain_relink=0-wont-disable-group-relink.patch This patch was dropped because it was merged into mainline or a subsystem tree ------------------------------------------------------ From: "Xiaowei.Hu" <xiaowei.hu@xxxxxxxxxx> Subject: ocfs2: ac->ac_allow_chain_relink=0 won't disable group relink ocfs2_block_group_alloc_discontig() disables chain relink by setting ac->ac_allow_chain_relink = 0 because it grabs clusters from multiple cluster groups. It doesn't keep the credits for all chain relink,but ocfs2_claim_suballoc_bits overrides this in this call trace: ocfs2_block_group_claim_bits()->ocfs2_claim_clusters()-> __ocfs2_claim_clusters()->ocfs2_claim_suballoc_bits() ocfs2_claim_suballoc_bits set ac->ac_allow_chain_relink = 1; then call ocfs2_search_chain() one time and disable it again, and then we run out of credits. Fix is to allow relink by default and disable it in ocfs2_block_group_alloc_discontig. Without this patch, End-users will run into a crash due to run out of credits, backtrace like this: RIP: 0010:[<ffffffffa0808b14>] [<ffffffffa0808b14>] jbd2_journal_dirty_metadata+0x164/0x170 [jbd2] RSP: 0018:ffff8801b919b5b8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff88022139ddc0 RCX: ffff880159f652d0 RDX: ffff880178aa3000 RSI: ffff880159f652d0 RDI: ffff880087f09bf8 RBP: ffff8801b919b5e8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000001e00 R11: 00000000000150b0 R12: ffff880159f652d0 R13: ffff8801a0cae908 R14: ffff880087f09bf8 R15: ffff88018d177800 FS: 00007fc9b0b6b6e0(0000) GS:ffff88022fd40000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: 000000000040819c CR3: 0000000184017000 CR4: 00000000000006e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process dd (pid: 9945, threadinfo ffff8801b919a000, task ffff880149a264c0) Stack: 00000001b919b5c8 ffff880159f652d0 ffff8801f565cc70 ffff880087f09bf8 000000000010e000 ffff88016da2f000 ffff8801b919b618 ffffffffa0865e4f 0000000000000000 ffff8801f565cc70 ffff880159f652d0 ffff8801fdc76e40 Call Trace: [<ffffffffa0865e4f>] ocfs2_journal_dirty+0x2f/0x70 [ocfs2] [<ffffffffa0889441>] ocfs2_relink_block_group+0x111/0x480 [ocfs2] [<ffffffffa088cda5>] ocfs2_search_chain+0x455/0x9a0 [ocfs2] ... Signed-off-by: Xiaowei.Hu <xiaowei.hu@xxxxxxxxxx> Reviewed-by: Srinivas Eeda <srinivas.eeda@xxxxxxxxxx> Cc: Mark Fasheh <mfasheh@xxxxxxxx> Cc: Joel Becker <jlbec@xxxxxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- fs/ocfs2/suballoc.c | 7 +++---- fs/ocfs2/suballoc.h | 2 +- 2 files changed, 4 insertions(+), 5 deletions(-) diff -puN fs/ocfs2/suballoc.c~ocfs2-ac-ac_allow_chain_relink=0-wont-disable-group-relink fs/ocfs2/suballoc.c --- a/fs/ocfs2/suballoc.c~ocfs2-ac-ac_allow_chain_relink=0-wont-disable-group-relink +++ a/fs/ocfs2/suballoc.c @@ -642,7 +642,7 @@ ocfs2_block_group_alloc_discontig(handle * cluster groups will be staying in cache for the duration of * this operation. */ - ac->ac_allow_chain_relink = 0; + ac->ac_disable_chain_relink = 1; /* Claim the first region */ status = ocfs2_block_group_claim_bits(osb, handle, ac, min_bits, @@ -1823,7 +1823,7 @@ static int ocfs2_search_chain(struct ocf * Do this *after* figuring out how many bits we're taking out * of our target group. */ - if (ac->ac_allow_chain_relink && + if (!ac->ac_disable_chain_relink && (prev_group_bh) && (ocfs2_block_group_reasonably_empty(bg, res->sr_bits))) { status = ocfs2_relink_block_group(handle, alloc_inode, @@ -1928,7 +1928,6 @@ static int ocfs2_claim_suballoc_bits(str victim = ocfs2_find_victim_chain(cl); ac->ac_chain = victim; - ac->ac_allow_chain_relink = 1; status = ocfs2_search_chain(ac, handle, bits_wanted, min_bits, res, &bits_left); @@ -1947,7 +1946,7 @@ static int ocfs2_claim_suballoc_bits(str * searching each chain in order. Don't allow chain relinking * because we only calculate enough journal credits for one * relink per alloc. */ - ac->ac_allow_chain_relink = 0; + ac->ac_disable_chain_relink = 1; for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i ++) { if (i == victim) continue; diff -puN fs/ocfs2/suballoc.h~ocfs2-ac-ac_allow_chain_relink=0-wont-disable-group-relink fs/ocfs2/suballoc.h --- a/fs/ocfs2/suballoc.h~ocfs2-ac-ac_allow_chain_relink=0-wont-disable-group-relink +++ a/fs/ocfs2/suballoc.h @@ -49,7 +49,7 @@ struct ocfs2_alloc_context { /* these are used by the chain search */ u16 ac_chain; - int ac_allow_chain_relink; + int ac_disable_chain_relink; group_search_t *ac_group_search; u64 ac_last_group; _ Patches currently in -mm which might be from xiaowei.hu@xxxxxxxxxx are origin.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html