Commit 907ea529 authored by Theodore Ts'o's avatar Theodore Ts'o

ext4: convert BUG_ON's to WARN_ON's in mballoc.c

If the in-core buddy bitmap gets corrupted (or out of sync with the
block bitmap), issue a WARN_ON and try to recover.  In most cases this
involves skipping trying to allocate out of a particular block group.
We can end up declaring the file system corrupted, which is fair,
since the file system probably should be checked before we proceed any

Google-Bug-Id: 34811296
Google-Bug-Id: 34639169
Signed-off-by: default avatarTheodore Ts'o <>
parent a17a9d93
......@@ -1943,7 +1943,8 @@ void ext4_mb_complex_scan_group(struct ext4_allocation_context *ac,
int free;
free = e4b->bd_info->bb_free;
BUG_ON(free <= 0);
if (WARN_ON(free <= 0))
i = e4b->bd_info->bb_first_free;
......@@ -1966,7 +1967,8 @@ void ext4_mb_complex_scan_group(struct ext4_allocation_context *ac,
mb_find_extent(e4b, i, ac->ac_g_ex.fe_len, &ex);
BUG_ON(ex.fe_len <= 0);
if (WARN_ON(ex.fe_len <= 0))
if (free < ex.fe_len) {
ext4_grp_locked_error(sb, e4b->bd_group, 0, 0,
"%d free clusters as per "
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