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| author | Jan Kara <jack@suse.cz> | 2017-06-08 14:39:48 +0200 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2017-08-17 18:52:48 +0200 |
| commit | bc8230ee8e2ba967af780cdaf2dcc0f8e5eb45ca (patch) | |
| tree | e35a0236c766c6e9db88548fb8ff0dc7861119e2 /fs/ext4 | |
| parent | aae4e7a8bc44722fe70d58920a36916b1043195e (diff) | |
| download | linux-bc8230ee8e2ba967af780cdaf2dcc0f8e5eb45ca.tar.gz linux-bc8230ee8e2ba967af780cdaf2dcc0f8e5eb45ca.tar.bz2 linux-bc8230ee8e2ba967af780cdaf2dcc0f8e5eb45ca.zip | |
quota: Convert dqio_mutex to rwsem
Convert dqio_mutex to rwsem and call it dqio_sem. No functional changes
yet.
Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/ext4')
| -rw-r--r-- | fs/ext4/super.c | 13 |
1 files changed, 4 insertions, 9 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c index d61a70e2193a..4c168b90903c 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -5263,18 +5263,13 @@ static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf) return 0; } -/* Helper function for writing quotas on sync - we need to start transaction - * before quota file is locked for write. Otherwise the are possible deadlocks: - * Process 1 Process 2 - * ext4_create() quota_sync() - * jbd2_journal_start() write_dquot() - * dquot_initialize() down(dqio_mutex) - * down(dqio_mutex) jbd2_journal_start() - * - */ #ifdef CONFIG_QUOTA +/* + * Helper functions so that transaction is started before we acquire dqio_sem + * to keep correct lock ordering of transaction > dqio_sem + */ static inline struct inode *dquot_to_inode(struct dquot *dquot) { return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type]; |