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| author | Theodore Ts'o <tytso@mit.edu> | 2009-04-23 05:00:36 +0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2009-04-23 05:00:36 +0400 |
| commit | b5451f7b2694b04d9f912f6cf09db1729f291996 (patch) | |
| tree | a1221f12730bc54357fc7600de2b5fbcce97cac3 /fs/ext4 | |
| parent | e84a26ce178345498a7eca0590852bcc36f1092f (diff) | |
| download | linux-b5451f7b2694b04d9f912f6cf09db1729f291996.tar.xz | |
ext4: Fix potential inode allocation soft lockup in Orlov allocator
If the Orlov allocator is having trouble finding an appropriate block
group, the fallback code could loop forever, causing a soft lockup
warning in find_group_orlov():
BUG: soft lockup - CPU#0 stuck for 61s! [cp:11728]
...
Pid: 11728, comm: cp Not tainted (2.6.30-rc1-dirty #77) Lenovo
EIP: 0060:[<c021650e>] EFLAGS: 00000246 CPU: 0
EIP is at ext4_get_group_desc+0x54/0x9d
...
Call Trace:
[<c0218021>] find_group_orlov+0x2ee/0x334
[<c0120a5f>] ? sched_clock+0x8/0xb
[<c02188e3>] ext4_new_inode+0x2cf/0xb1a
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4')
| -rw-r--r-- | fs/ext4/ialloc.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c index cbce5aa6b927..f18e0a08a6b5 100644 --- a/fs/ext4/ialloc.c +++ b/fs/ext4/ialloc.c @@ -585,6 +585,7 @@ static int find_group_orlov(struct super_block *sb, struct inode *parent, fallback: ngroups = sbi->s_groups_count; avefreei = freei / ngroups; +fallback_retry: parent_group = EXT4_I(parent)->i_block_group; for (i = 0; i < ngroups; i++) { grp = (parent_group + i) % ngroups; @@ -602,7 +603,7 @@ fallback: * filesystems the above test can fail to find any blockgroups */ avefreei = 0; - goto fallback; + goto fallback_retry; } return -1; |