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| author | Jan Kara <jack@suse.cz> | 2017-05-21 22:31:23 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2017-05-21 22:31:23 -0400 |
| commit | 964edf66bf9ab70cb387b27946c0aef7b94c4d1b (patch) | |
| tree | 1c7bc7711f0199abf6ccf5f87a9c45fbc1f261a8 /fs/ext4 | |
| parent | 08332893e37af6ae779367e78e444f8f9571511d (diff) | |
| download | linux-0-day-964edf66bf9ab70cb387b27946c0aef7b94c4d1b.tar.gz linux-0-day-964edf66bf9ab70cb387b27946c0aef7b94c4d1b.tar.xz | |
ext4: clear lockdep subtype for quota files on quota off
Quota files have special ranking of i_data_sem lock. We inform lockdep
about it when turning on quotas however when turning quotas off, we
don't clear the lockdep subclass from i_data_sem lock and thus when the
inode gets later reused for a normal file or directory, lockdep gets
confused and complains about possible deadlocks. Fix the problem by
resetting lockdep subclass of i_data_sem on quota off.
Cc: stable@vger.kernel.org
Fixes: daf647d2dd58cec59570d7698a45b98e580f2076
Reported-and-tested-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Reviewed-by: Andreas Dilger <adilger@dilger.ca>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4')
| -rw-r--r-- | fs/ext4/super.c | 14 |
1 files changed, 5 insertions, 9 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 0b177da9ea827..8f05c72bc4ec7 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -848,14 +848,9 @@ static inline void ext4_quota_off_umount(struct super_block *sb) { int type; - if (ext4_has_feature_quota(sb)) { - dquot_disable(sb, -1, - DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); - } else { - /* Use our quota_off function to clear inode flags etc. */ - for (type = 0; type < EXT4_MAXQUOTAS; type++) - ext4_quota_off(sb, type); - } + /* Use our quota_off function to clear inode flags etc. */ + for (type = 0; type < EXT4_MAXQUOTAS; type++) + ext4_quota_off(sb, type); } #else static inline void ext4_quota_off_umount(struct super_block *sb) @@ -5485,7 +5480,7 @@ static int ext4_quota_off(struct super_block *sb, int type) goto out; err = dquot_quota_off(sb, type); - if (err) + if (err || ext4_has_feature_quota(sb)) goto out_put; inode_lock(inode); @@ -5505,6 +5500,7 @@ static int ext4_quota_off(struct super_block *sb, int type) out_unlock: inode_unlock(inode); out_put: + lockdep_set_quota_inode(inode, I_DATA_SEM_NORMAL); iput(inode); return err; out: |