From f2a09af645b762f8230e7eba7fee3b6f7e6e96e7 Mon Sep 17 00:00:00 2001 From: Yongqiang Yang Date: Sun, 23 Sep 2012 23:16:03 -0400 Subject: [PATCH] ext4: check free inode count before allocating an inode Recently, I ecountered some corrupted filesystems in which some groups' free inode counts were 65535, 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 Signed-off-by: "Theodore Ts'o" --- fs/ext4/ialloc.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c index 26154b81b836..fa36372f3fdf 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)