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Date: Sun, 2 Sep 2012 17:45:09 +0800 From: Yongqiang Yang <xiaoqiangnk@...il.com> To: linux-ext4@...r.kernel.org Cc: tytso@....edu, Yongqiang Yang <xiaoqiangnk@...il.com> Subject: [PATCH 2/2] ext4: check free inode count before allocaing an inode Recnetly, I ecountered some corrupted filesystems in which some groups' free inode counts were negative, it seemed that free inode count was overflow. This patch teaches ext4 to check free inode count before allocaing an inode. Signed-off-by: Yongqiang Yang <xiaoqiangnk@...il.com> --- fs/ext4/ialloc.c | 9 +++++++++ 1 files changed, 9 insertions(+), 0 deletions(-) diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c index 26154b8..fa36372 100644 --- a/fs/ext4/ialloc.c +++ b/fs/ext4/ialloc.c @@ -697,6 +697,15 @@ got_group: if (!gdp) goto fail; + /* + * Check free inodes count before loading bitmap. + */ + if (ext4_free_inodes_count(sb, gdp) == 0) { + if (++group == ngroups) + group = 0; + continue; + } + brelse(inode_bitmap_bh); inode_bitmap_bh = ext4_read_inode_bitmap(sb, group); if (!inode_bitmap_bh) -- 1.7.5.1 -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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