From fccb0272b539368be564a8d09ae4b71134a237d3 Mon Sep 17 00:00:00 2001 From: Eric Sandeen Date: Tue, 2 Jun 2009 08:09:13 -0400 Subject: [PATCH] ext4: fix ext4_free_inode() vs. ext4_claim_inode() race (cherry picked from commit 7ce9d5d1f3c8736511daa413c64985a05b2feee3) I was seeing fsck errors on inode bitmaps after a 4 thread dbench run on a 4 cpu machine: Inode bitmap differences: -50736 -(50752--50753) etc... I believe that this is because ext4_free_inode() uses atomic bitops, and although ext4_new_inode() *used* to also use atomic bitops for synchronization, commit 393418676a7602e1d7d3f6e560159c65c8cbd50e changed this to use the sb_bgl_lock, so that we could also synchronize against read_inode_bitmap and initialization of uninit inode tables. However, that change left ext4_free_inode using atomic bitops, which I think leaves no synchronization between setting & unsetting bits in the inode table. The below patch fixes it for me, although I wonder if we're getting at all heavy-handed with this spinlock... Signed-off-by: Eric Sandeen Reviewed-by: Aneesh Kumar K.V Signed-off-by: "Theodore Ts'o" Signed-off-by: Greg Kroah-Hartman --- fs/ext4/ialloc.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c index cce841fe4490..f9b9fad959dc 100644 --- a/fs/ext4/ialloc.c +++ b/fs/ext4/ialloc.c @@ -188,7 +188,7 @@ void ext4_free_inode (handle_t *handle, struct inode * inode) struct ext4_group_desc * gdp; struct ext4_super_block * es; struct ext4_sb_info *sbi; - int fatal = 0, err; + int fatal = 0, err, cleared; ext4_group_t flex_group; if (atomic_read(&inode->i_count) > 1) { @@ -242,10 +242,12 @@ void ext4_free_inode (handle_t *handle, struct inode * inode) goto error_return; /* Ok, now we can actually update the inode bitmaps.. */ - if (!ext4_clear_bit_atomic(sb_bgl_lock(sbi, block_group), - bit, bitmap_bh->b_data)) - ext4_error (sb, "ext4_free_inode", - "bit already cleared for inode %lu", ino); + spin_lock(sb_bgl_lock(sbi, block_group)); + cleared = ext4_clear_bit(bit, bitmap_bh->b_data); + spin_unlock(sb_bgl_lock(sbi, block_group)); + if (!cleared) + ext4_error(sb, "ext4_free_inode", + "bit already cleared for inode %lu", ino); else { gdp = ext4_get_group_desc (sb, block_group, &bh2); -- 2.39.2