On Tue 21-09-21 23:32:33, Dan Carpenter wrote:
> The ext2_error() function syncs the filesystem so it sleeps. The caller
> is holding a spinlock so it's not allowed to sleep.
>
> ext2_statfs() <- disables preempt
> -> ext2_count_free_blocks()
> -> ext2_get_group_desc()
>
> Fix this by using WARN() to print an error message and a stack trace
> instead of using ext2_error().
>
> Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Thanks! I've added the patch to my tree.
Honza
> ---
> v2: The first version disabled the sync in ext2_error()
>
> fs/ext2/balloc.c | 14 ++++++--------
> 1 file changed, 6 insertions(+), 8 deletions(-)
>
> diff --git a/fs/ext2/balloc.c b/fs/ext2/balloc.c
> index 1f3f4326bf3c..c17ccc19b938 100644
> --- a/fs/ext2/balloc.c
> +++ b/fs/ext2/balloc.c
> @@ -48,10 +48,9 @@ struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb,
> struct ext2_sb_info *sbi = EXT2_SB(sb);
>
> if (block_group >= sbi->s_groups_count) {
> - ext2_error (sb, "ext2_get_group_desc",
> - "block_group >= groups_count - "
> - "block_group = %d, groups_count = %lu",
> - block_group, sbi->s_groups_count);
> + WARN(1, "block_group >= groups_count - "
> + "block_group = %d, groups_count = %lu",
> + block_group, sbi->s_groups_count);
>
> return NULL;
> }
> @@ -59,10 +58,9 @@ struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb,
> group_desc = block_group >> EXT2_DESC_PER_BLOCK_BITS(sb);
> offset = block_group & (EXT2_DESC_PER_BLOCK(sb) - 1);
> if (!sbi->s_group_desc[group_desc]) {
> - ext2_error (sb, "ext2_get_group_desc",
> - "Group descriptor not loaded - "
> - "block_group = %d, group_desc = %lu, desc = %lu",
> - block_group, group_desc, offset);
> + WARN(1, "Group descriptor not loaded - "
> + "block_group = %d, group_desc = %lu, desc = %lu",
> + block_group, group_desc, offset);
> return NULL;
> }
>
> --
> 2.20.1
>
--
Jan Kara <jack@xxxxxxxx>
SUSE Labs, CR
