add cherry-picks for OCFS2 bug
see https://forum.proxmox.com/threads/ocfs2-kernel-bug.39163/
This commit is contained in:
Fabian Grünbichler
parent
863ccb9670
commit
3323a8b78c
@ -0,0 +1,61 @@
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Changwei Ge <ge.changwei@h3c.com>
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Date: Wed, 31 Jan 2018 16:15:02 -0800
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Subject: [PATCH] ocfs2: make metadata estimation accurate and clear
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Current code assume that ::w_unwritten_list always has only one item on.
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This is not right and hard to get understood. So improve how to count
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unwritten item.
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Link: http://lkml.kernel.org/r/1515479070-32653-1-git-send-email-ge.changwei@h3c.com
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Signed-off-by: Changwei Ge <ge.changwei@h3c.com>
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Reported-by: John Lightsey <john@nixnuts.net>
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Tested-by: John Lightsey <john@nixnuts.net>
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Cc: Mark Fasheh <mfasheh@versity.com>
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Cc: Joseph Qi <jiangqi903@gmail.com>
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Cc: Junxiao Bi <junxiao.bi@oracle.com>
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Cc: Joel Becker <jlbec@evilplan.org>
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Cc: Changwei Ge <ge.changwei@h3c.com>
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Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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(cherry picked from commit 63de8bd9328bf2a778fc277503da163ae3defa3c)
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Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
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---
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fs/ocfs2/aops.c | 4 +++-
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1 file changed, 3 insertions(+), 1 deletion(-)
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diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
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index 88a31e9340a0..77ec9b495027 100644
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--- a/fs/ocfs2/aops.c
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+++ b/fs/ocfs2/aops.c
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@@ -784,6 +784,7 @@ struct ocfs2_write_ctxt {
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struct ocfs2_cached_dealloc_ctxt w_dealloc;
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struct list_head w_unwritten_list;
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+ unsigned int w_unwritten_count;
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};
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void ocfs2_unlock_and_free_pages(struct page **pages, int num_pages)
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@@ -1373,6 +1374,7 @@ static int ocfs2_unwritten_check(struct inode *inode,
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desc->c_clear_unwritten = 0;
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list_add_tail(&new->ue_ip_node, &oi->ip_unwritten_list);
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list_add_tail(&new->ue_node, &wc->w_unwritten_list);
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+ wc->w_unwritten_count++;
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new = NULL;
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unlock:
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spin_unlock(&oi->ip_lock);
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@@ -2246,7 +2248,7 @@ static int ocfs2_dio_get_block(struct inode *inode, sector_t iblock,
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ue->ue_phys = desc->c_phys;
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list_splice_tail_init(&wc->w_unwritten_list, &dwc->dw_zero_list);
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- dwc->dw_zero_count++;
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+ dwc->dw_zero_count += wc->w_unwritten_count;
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}
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ret = ocfs2_write_end_nolock(inode->i_mapping, pos, len, len, wc);
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--
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2.14.2
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@ -0,0 +1,370 @@
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Changwei Ge <ge.changwei@h3c.com>
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Date: Wed, 31 Jan 2018 16:15:06 -0800
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Subject: [PATCH] ocfs2: try to reuse extent block in dealloc without
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meta_alloc
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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A crash issue was reported by John Lightsey with a call trace as follows:
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ocfs2_split_extent+0x1ad3/0x1b40 [ocfs2]
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ocfs2_change_extent_flag+0x33a/0x470 [ocfs2]
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ocfs2_mark_extent_written+0x172/0x220 [ocfs2]
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ocfs2_dio_end_io+0x62d/0x910 [ocfs2]
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dio_complete+0x19a/0x1a0
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do_blockdev_direct_IO+0x19dd/0x1eb0
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__blockdev_direct_IO+0x43/0x50
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ocfs2_direct_IO+0x8f/0xa0 [ocfs2]
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generic_file_direct_write+0xb2/0x170
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__generic_file_write_iter+0xc3/0x1b0
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ocfs2_file_write_iter+0x4bb/0xca0 [ocfs2]
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__vfs_write+0xae/0xf0
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vfs_write+0xb8/0x1b0
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SyS_write+0x4f/0xb0
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system_call_fastpath+0x16/0x75
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The BUG code told that extent tree wants to grow but no metadata was
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reserved ahead of time. From my investigation into this issue, the root
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cause it that although enough metadata is not reserved, there should be
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enough for following use. Rightmost extent is merged into its left one
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due to a certain times of marking extent written. Because during
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marking extent written, we got many physically continuous extents. At
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last, an empty extent showed up and the rightmost path is removed from
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extent tree.
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Add a new mechanism to reuse extent block cached in dealloc which were
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just unlinked from extent tree to solve this crash issue.
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Criteria is that during marking extents *written*, if extent rotation
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and merging results in unlinking extent with growing extent tree later
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without any metadata reserved ahead of time, try to reuse those extents
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in dealloc in which deleted extents are cached.
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Also, this patch addresses the issue John reported that ::dw_zero_count
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is not calculated properly.
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After applying this patch, the issue John reported was gone. Thanks for
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the reproducer provided by John. And this patch has passed
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ocfs2-test(29 cases) suite running by New H3C Group.
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[ge.changwei@h3c.com: fix static checker warnning]
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Link: http://lkml.kernel.org/r/63ADC13FD55D6546B7DECE290D39E373F29196AE@H3CMLB12-EX.srv.huawei-3com.com
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[akpm@linux-foundation.org: brelse(NULL) is legal]
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Link: http://lkml.kernel.org/r/1515479070-32653-2-git-send-email-ge.changwei@h3c.com
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Signed-off-by: Changwei Ge <ge.changwei@h3c.com>
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Reported-by: John Lightsey <john@nixnuts.net>
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Tested-by: John Lightsey <john@nixnuts.net>
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Cc: Joel Becker <jlbec@evilplan.org>
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Cc: Joseph Qi <jiangqi903@gmail.com>
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Cc: Junxiao Bi <junxiao.bi@oracle.com>
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Cc: Dan Carpenter <dan.carpenter@oracle.com>
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Cc: Mark Fasheh <mfasheh@versity.com>
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Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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(cherry picked from commit 71a36944042b7d9dd71f6a5d1c5ea1c2353b5d42)
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Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
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---
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fs/ocfs2/alloc.h | 1 +
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fs/ocfs2/alloc.c | 206 ++++++++++++++++++++++++++++++++++++++++++++++++++++---
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fs/ocfs2/aops.c | 6 ++
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3 files changed, 203 insertions(+), 10 deletions(-)
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diff --git a/fs/ocfs2/alloc.h b/fs/ocfs2/alloc.h
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index 4a5152ec88a3..571692171dd1 100644
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--- a/fs/ocfs2/alloc.h
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+++ b/fs/ocfs2/alloc.h
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@@ -61,6 +61,7 @@ struct ocfs2_extent_tree {
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ocfs2_journal_access_func et_root_journal_access;
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void *et_object;
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unsigned int et_max_leaf_clusters;
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+ struct ocfs2_cached_dealloc_ctxt *et_dealloc;
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};
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/*
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diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
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index 386aecce881d..9b5e7d8ba710 100644
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--- a/fs/ocfs2/alloc.c
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+++ b/fs/ocfs2/alloc.c
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@@ -165,6 +165,13 @@ static int ocfs2_dinode_insert_check(struct ocfs2_extent_tree *et,
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struct ocfs2_extent_rec *rec);
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static int ocfs2_dinode_sanity_check(struct ocfs2_extent_tree *et);
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static void ocfs2_dinode_fill_root_el(struct ocfs2_extent_tree *et);
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+
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+static int ocfs2_reuse_blk_from_dealloc(handle_t *handle,
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+ struct ocfs2_extent_tree *et,
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+ struct buffer_head **new_eb_bh,
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+ int blk_wanted, int *blk_given);
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+static int ocfs2_is_dealloc_empty(struct ocfs2_extent_tree *et);
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+
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static const struct ocfs2_extent_tree_operations ocfs2_dinode_et_ops = {
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.eo_set_last_eb_blk = ocfs2_dinode_set_last_eb_blk,
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.eo_get_last_eb_blk = ocfs2_dinode_get_last_eb_blk,
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@@ -448,6 +455,7 @@ static void __ocfs2_init_extent_tree(struct ocfs2_extent_tree *et,
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if (!obj)
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obj = (void *)bh->b_data;
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et->et_object = obj;
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+ et->et_dealloc = NULL;
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et->et_ops->eo_fill_root_el(et);
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if (!et->et_ops->eo_fill_max_leaf_clusters)
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@@ -1159,7 +1167,7 @@ static int ocfs2_add_branch(handle_t *handle,
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struct buffer_head **last_eb_bh,
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struct ocfs2_alloc_context *meta_ac)
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{
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- int status, new_blocks, i;
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+ int status, new_blocks, i, block_given = 0;
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u64 next_blkno, new_last_eb_blk;
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struct buffer_head *bh;
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struct buffer_head **new_eb_bhs = NULL;
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@@ -1214,11 +1222,31 @@ static int ocfs2_add_branch(handle_t *handle,
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goto bail;
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}
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- status = ocfs2_create_new_meta_bhs(handle, et, new_blocks,
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- meta_ac, new_eb_bhs);
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- if (status < 0) {
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- mlog_errno(status);
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- goto bail;
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+ /* Firstyly, try to reuse dealloc since we have already estimated how
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+ * many extent blocks we may use.
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+ */
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+ if (!ocfs2_is_dealloc_empty(et)) {
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+ status = ocfs2_reuse_blk_from_dealloc(handle, et,
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+ new_eb_bhs, new_blocks,
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+ &block_given);
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+ if (status < 0) {
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+ mlog_errno(status);
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+ goto bail;
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+ }
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+ }
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+
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+ BUG_ON(block_given > new_blocks);
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+
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+ if (block_given < new_blocks) {
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+ BUG_ON(!meta_ac);
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+ status = ocfs2_create_new_meta_bhs(handle, et,
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+ new_blocks - block_given,
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+ meta_ac,
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+ &new_eb_bhs[block_given]);
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+ if (status < 0) {
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+ mlog_errno(status);
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+ goto bail;
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+ }
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}
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/* Note: new_eb_bhs[new_blocks - 1] is the guy which will be
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@@ -1341,15 +1369,25 @@ static int ocfs2_shift_tree_depth(handle_t *handle,
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struct ocfs2_alloc_context *meta_ac,
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struct buffer_head **ret_new_eb_bh)
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{
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- int status, i;
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+ int status, i, block_given = 0;
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u32 new_clusters;
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struct buffer_head *new_eb_bh = NULL;
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struct ocfs2_extent_block *eb;
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struct ocfs2_extent_list *root_el;
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struct ocfs2_extent_list *eb_el;
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- status = ocfs2_create_new_meta_bhs(handle, et, 1, meta_ac,
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- &new_eb_bh);
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+ if (!ocfs2_is_dealloc_empty(et)) {
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+ status = ocfs2_reuse_blk_from_dealloc(handle, et,
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+ &new_eb_bh, 1,
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+ &block_given);
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+ } else if (meta_ac) {
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+ status = ocfs2_create_new_meta_bhs(handle, et, 1, meta_ac,
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+ &new_eb_bh);
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+
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+ } else {
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+ BUG();
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+ }
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+
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if (status < 0) {
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mlog_errno(status);
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goto bail;
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@@ -1512,7 +1550,7 @@ static int ocfs2_grow_tree(handle_t *handle, struct ocfs2_extent_tree *et,
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int depth = le16_to_cpu(el->l_tree_depth);
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struct buffer_head *bh = NULL;
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- BUG_ON(meta_ac == NULL);
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+ BUG_ON(meta_ac == NULL && ocfs2_is_dealloc_empty(et));
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shift = ocfs2_find_branch_target(et, &bh);
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if (shift < 0) {
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@@ -6593,6 +6631,154 @@ ocfs2_find_per_slot_free_list(int type,
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return fl;
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}
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+static struct ocfs2_per_slot_free_list *
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+ocfs2_find_preferred_free_list(int type,
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+ int preferred_slot,
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+ int *real_slot,
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+ struct ocfs2_cached_dealloc_ctxt *ctxt)
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+{
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+ struct ocfs2_per_slot_free_list *fl = ctxt->c_first_suballocator;
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+
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+ while (fl) {
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+ if (fl->f_inode_type == type && fl->f_slot == preferred_slot) {
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+ *real_slot = fl->f_slot;
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+ return fl;
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+ }
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+
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+ fl = fl->f_next_suballocator;
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+ }
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+
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+ /* If we can't find any free list matching preferred slot, just use
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+ * the first one.
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+ */
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+ fl = ctxt->c_first_suballocator;
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+ *real_slot = fl->f_slot;
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+
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+ return fl;
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+}
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+
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+/* Return Value 1 indicates empty */
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+static int ocfs2_is_dealloc_empty(struct ocfs2_extent_tree *et)
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+{
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+ struct ocfs2_per_slot_free_list *fl = NULL;
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+
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+ if (!et->et_dealloc)
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+ return 1;
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+
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+ fl = et->et_dealloc->c_first_suballocator;
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+ if (!fl)
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+ return 1;
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+
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+ if (!fl->f_first)
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+ return 1;
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+
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+ return 0;
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+}
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+
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+/* If extent was deleted from tree due to extent rotation and merging, and
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+ * no metadata is reserved ahead of time. Try to reuse some extents
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+ * just deleted. This is only used to reuse extent blocks.
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+ * It is supposed to find enough extent blocks in dealloc if our estimation
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+ * on metadata is accurate.
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+ */
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+static int ocfs2_reuse_blk_from_dealloc(handle_t *handle,
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+ struct ocfs2_extent_tree *et,
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+ struct buffer_head **new_eb_bh,
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+ int blk_wanted, int *blk_given)
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+{
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+ int i, status = 0, real_slot;
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+ struct ocfs2_cached_dealloc_ctxt *dealloc;
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+ struct ocfs2_per_slot_free_list *fl;
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+ struct ocfs2_cached_block_free *bf;
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+ struct ocfs2_extent_block *eb;
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+ struct ocfs2_super *osb =
|
||||||
|
+ OCFS2_SB(ocfs2_metadata_cache_get_super(et->et_ci));
|
||||||
|
+
|
||||||
|
+ *blk_given = 0;
|
||||||
|
+
|
||||||
|
+ /* If extent tree doesn't have a dealloc, this is not faulty. Just
|
||||||
|
+ * tell upper caller dealloc can't provide any block and it should
|
||||||
|
+ * ask for alloc to claim more space.
|
||||||
|
+ */
|
||||||
|
+ dealloc = et->et_dealloc;
|
||||||
|
+ if (!dealloc)
|
||||||
|
+ goto bail;
|
||||||
|
+
|
||||||
|
+ for (i = 0; i < blk_wanted; i++) {
|
||||||
|
+ /* Prefer to use local slot */
|
||||||
|
+ fl = ocfs2_find_preferred_free_list(EXTENT_ALLOC_SYSTEM_INODE,
|
||||||
|
+ osb->slot_num, &real_slot,
|
||||||
|
+ dealloc);
|
||||||
|
+ /* If no more block can be reused, we should claim more
|
||||||
|
+ * from alloc. Just return here normally.
|
||||||
|
+ */
|
||||||
|
+ if (!fl) {
|
||||||
|
+ status = 0;
|
||||||
|
+ break;
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ bf = fl->f_first;
|
||||||
|
+ fl->f_first = bf->free_next;
|
||||||
|
+
|
||||||
|
+ new_eb_bh[i] = sb_getblk(osb->sb, bf->free_blk);
|
||||||
|
+ if (new_eb_bh[i] == NULL) {
|
||||||
|
+ status = -ENOMEM;
|
||||||
|
+ mlog_errno(status);
|
||||||
|
+ goto bail;
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ mlog(0, "Reusing block(%llu) from "
|
||||||
|
+ "dealloc(local slot:%d, real slot:%d)\n",
|
||||||
|
+ bf->free_blk, osb->slot_num, real_slot);
|
||||||
|
+
|
||||||
|
+ ocfs2_set_new_buffer_uptodate(et->et_ci, new_eb_bh[i]);
|
||||||
|
+
|
||||||
|
+ status = ocfs2_journal_access_eb(handle, et->et_ci,
|
||||||
|
+ new_eb_bh[i],
|
||||||
|
+ OCFS2_JOURNAL_ACCESS_CREATE);
|
||||||
|
+ if (status < 0) {
|
||||||
|
+ mlog_errno(status);
|
||||||
|
+ goto bail;
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ memset(new_eb_bh[i]->b_data, 0, osb->sb->s_blocksize);
|
||||||
|
+ eb = (struct ocfs2_extent_block *) new_eb_bh[i]->b_data;
|
||||||
|
+
|
||||||
|
+ /* We can't guarantee that buffer head is still cached, so
|
||||||
|
+ * polutlate the extent block again.
|
||||||
|
+ */
|
||||||
|
+ strcpy(eb->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE);
|
||||||
|
+ eb->h_blkno = cpu_to_le64(bf->free_blk);
|
||||||
|
+ eb->h_fs_generation = cpu_to_le32(osb->fs_generation);
|
||||||
|
+ eb->h_suballoc_slot = cpu_to_le16(real_slot);
|
||||||
|
+ eb->h_suballoc_loc = cpu_to_le64(bf->free_bg);
|
||||||
|
+ eb->h_suballoc_bit = cpu_to_le16(bf->free_bit);
|
||||||
|
+ eb->h_list.l_count =
|
||||||
|
+ cpu_to_le16(ocfs2_extent_recs_per_eb(osb->sb));
|
||||||
|
+
|
||||||
|
+ /* We'll also be dirtied by the caller, so
|
||||||
|
+ * this isn't absolutely necessary.
|
||||||
|
+ */
|
||||||
|
+ ocfs2_journal_dirty(handle, new_eb_bh[i]);
|
||||||
|
+
|
||||||
|
+ if (!fl->f_first) {
|
||||||
|
+ dealloc->c_first_suballocator = fl->f_next_suballocator;
|
||||||
|
+ kfree(fl);
|
||||||
|
+ }
|
||||||
|
+ kfree(bf);
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ *blk_given = i;
|
||||||
|
+
|
||||||
|
+bail:
|
||||||
|
+ if (unlikely(status < 0)) {
|
||||||
|
+ for (i = 0; i < blk_wanted; i++)
|
||||||
|
+ brelse(new_eb_bh[i]);
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ return status;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
int ocfs2_cache_block_dealloc(struct ocfs2_cached_dealloc_ctxt *ctxt,
|
||||||
|
int type, int slot, u64 suballoc,
|
||||||
|
u64 blkno, unsigned int bit)
|
||||||
|
diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
|
||||||
|
index 77ec9b495027..2ff02dda97d8 100644
|
||||||
|
--- a/fs/ocfs2/aops.c
|
||||||
|
+++ b/fs/ocfs2/aops.c
|
||||||
|
@@ -2322,6 +2322,12 @@ static int ocfs2_dio_end_io_write(struct inode *inode,
|
||||||
|
|
||||||
|
ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), di_bh);
|
||||||
|
|
||||||
|
+ /* Attach dealloc with extent tree in case that we may reuse extents
|
||||||
|
+ * which are already unlinked from current extent tree due to extent
|
||||||
|
+ * rotation and merging.
|
||||||
|
+ */
|
||||||
|
+ et.et_dealloc = &dealloc;
|
||||||
|
+
|
||||||
|
ret = ocfs2_lock_allocators(inode, &et, 0, dwc->dw_zero_count*2,
|
||||||
|
&data_ac, &meta_ac);
|
||||||
|
if (ret) {
|
||||||
|
--
|
||||||
|
2.14.2
|
||||||
|
|
||||||
Loading…
Reference in New Issue
Block a user