From f9195e3761173e161b5a8d8a0692bc83fd980725 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) -- 2.39.5