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authorYongqiang Yang <xiaoqiangnk@gmail.com>2012-09-05 01:21:50 -0400
committerTheodore Ts'o <tytso@mit.edu>2012-09-05 01:21:50 -0400
commit03c1c29053f678234dbd51bf3d65f3b7529021de (patch)
tree7f46e690871d24c4bc28911685ea2662d66688e5 /fs/ext4/resize.c
parent8a2f8460e816f4786939a0cefbda35af6bd1a1c5 (diff)
ext4: ignore last group w/o enough space when resizing instead of BUG'ing
If the last group does not have enough space for group tables, ignore it instead of calling BUG_ON(). Reported-by: Daniel Drake <dsd@laptop.org> Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Cc: stable@vger.kernel.org
Diffstat (limited to 'fs/ext4/resize.c')
-rw-r--r--fs/ext4/resize.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index 41f6ef68e2e1..28031c4e15e9 100644
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -200,8 +200,11 @@ static void free_flex_gd(struct ext4_new_flex_group_data *flex_gd)
* be a partial of a flex group.
*
* @sb: super block of fs to which the groups belongs
+ *
+ * Returns 0 on a successful allocation of the metadata blocks in the
+ * block group.
*/
-static void ext4_alloc_group_tables(struct super_block *sb,
+static int ext4_alloc_group_tables(struct super_block *sb,
struct ext4_new_flex_group_data *flex_gd,
int flexbg_size)
{
@@ -226,6 +229,8 @@ static void ext4_alloc_group_tables(struct super_block *sb,
(last_group & ~(flexbg_size - 1))));
next_group:
group = group_data[0].group;
+ if (src_group >= group_data[0].group + flex_gd->count)
+ return -ENOSPC;
start_blk = ext4_group_first_block_no(sb, src_group);
last_blk = start_blk + group_data[src_group - group].blocks_count;
@@ -235,7 +240,6 @@ next_group:
start_blk += overhead;
- BUG_ON(src_group >= group_data[0].group + flex_gd->count);
/* We collect contiguous blocks as much as possible. */
src_group++;
for (; src_group <= last_group; src_group++)
@@ -300,6 +304,7 @@ next_group:
group_data[i].free_blocks_count);
}
}
+ return 0;
}
static struct buffer_head *bclean(handle_t *handle, struct super_block *sb,
@@ -1729,7 +1734,8 @@ int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count)
*/
while (ext4_setup_next_flex_gd(sb, flex_gd, n_blocks_count,
flexbg_size)) {
- ext4_alloc_group_tables(sb, flex_gd, flexbg_size);
+ if (ext4_alloc_group_tables(sb, flex_gd, flexbg_size) != 0)
+ break;
err = ext4_flex_group_add(sb, resize_inode, flex_gd);
if (unlikely(err))
break;