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>
diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index 53a1749..29d4475 100644
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -120,7 +120,7 @@
* spinlock to internal buffers before writing.
*
* Lock ordering (including related VFS locks) is the following:
- * s_umount > i_mutex > journal_lock > dquot->dq_lock > dqio_mutex
+ * s_umount > i_mutex > journal_lock > dquot->dq_lock > dqio_sem
*/
static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_list_lock);
@@ -406,7 +406,7 @@
struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
mutex_lock(&dquot->dq_lock);
- mutex_lock(&dqopt->dqio_mutex);
+ down_write(&dqopt->dqio_sem);
if (!test_bit(DQ_READ_B, &dquot->dq_flags))
ret = dqopt->ops[dquot->dq_id.type]->read_dqblk(dquot);
if (ret < 0)
@@ -436,7 +436,7 @@
smp_mb__before_atomic();
set_bit(DQ_ACTIVE_B, &dquot->dq_flags);
out_iolock:
- mutex_unlock(&dqopt->dqio_mutex);
+ up_write(&dqopt->dqio_sem);
mutex_unlock(&dquot->dq_lock);
return ret;
}
@@ -450,7 +450,7 @@
int ret = 0;
struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
- mutex_lock(&dqopt->dqio_mutex);
+ down_write(&dqopt->dqio_sem);
spin_lock(&dq_list_lock);
if (!clear_dquot_dirty(dquot)) {
spin_unlock(&dq_list_lock);
@@ -464,7 +464,7 @@
else
ret = -EIO;
out_sem:
- mutex_unlock(&dqopt->dqio_mutex);
+ up_write(&dqopt->dqio_sem);
return ret;
}
EXPORT_SYMBOL(dquot_commit);
@@ -481,7 +481,7 @@
/* Check whether we are not racing with some other dqget() */
if (atomic_read(&dquot->dq_count) > 1)
goto out_dqlock;
- mutex_lock(&dqopt->dqio_mutex);
+ down_write(&dqopt->dqio_sem);
if (dqopt->ops[dquot->dq_id.type]->release_dqblk) {
ret = dqopt->ops[dquot->dq_id.type]->release_dqblk(dquot);
/* Write the info */
@@ -493,7 +493,7 @@
ret = ret2;
}
clear_bit(DQ_ACTIVE_B, &dquot->dq_flags);
- mutex_unlock(&dqopt->dqio_mutex);
+ up_write(&dqopt->dqio_sem);
out_dqlock:
mutex_unlock(&dquot->dq_lock);
return ret;
@@ -2060,9 +2060,9 @@
int ret;
struct quota_info *dqopt = sb_dqopt(sb);
- mutex_lock(&dqopt->dqio_mutex);
+ down_write(&dqopt->dqio_sem);
ret = dqopt->ops[type]->write_file_info(sb, type);
- mutex_unlock(&dqopt->dqio_mutex);
+ up_write(&dqopt->dqio_sem);
return ret;
}
EXPORT_SYMBOL(dquot_commit_info);
@@ -2076,9 +2076,9 @@
return -ESRCH;
if (!dqopt->ops[qid->type]->get_next_id)
return -ENOSYS;
- mutex_lock(&dqopt->dqio_mutex);
+ down_write(&dqopt->dqio_sem);
err = dqopt->ops[qid->type]->get_next_id(sb, qid);
- mutex_unlock(&dqopt->dqio_mutex);
+ up_write(&dqopt->dqio_sem);
return err;
}
EXPORT_SYMBOL(dquot_get_next_id);
@@ -2328,15 +2328,15 @@
dqopt->info[type].dqi_format = fmt;
dqopt->info[type].dqi_fmt_id = format_id;
INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list);
- mutex_lock(&dqopt->dqio_mutex);
+ down_write(&dqopt->dqio_sem);
error = dqopt->ops[type]->read_file_info(sb, type);
if (error < 0) {
- mutex_unlock(&dqopt->dqio_mutex);
+ up_write(&dqopt->dqio_sem);
goto out_file_init;
}
if (dqopt->flags & DQUOT_QUOTA_SYS_FILE)
dqopt->info[type].dqi_flags |= DQF_SYS_FILE;
- mutex_unlock(&dqopt->dqio_mutex);
+ up_write(&dqopt->dqio_sem);
spin_lock(&dq_state_lock);
dqopt->flags |= dquot_state_flag(flags, type);
spin_unlock(&dq_state_lock);