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quota: Acquire dqio_sem for reading in vfs_load_quota_inode()

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vfs_load_quota_inode() needs dqio_sem only for reading. In fact dqio_sem
is not needed there at all since the function can be called only during
quota on when quota file cannot be modified but let's leave the
protection there since it is logical and the path is in no way
performance critical.

Reviewed-by: Andreas Dilger <[email protected]>
Signed-off-by: Jan Kara <[email protected]>
This commit is contained in:
Jan Kara 2017-06-08 15:06:28 +02:00
commit d6ab366102
2 changed files with 6 additions and 6 deletions
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6
fs/quota/dquot.c
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@ -2331,15 +2331,15 @@ static int vfs_load_quota_inode(struct inode *inode, int type, int format_id,
dqopt->info[type].dqi_format = fmt;
dqopt->info[type].dqi_fmt_id = format_id;
INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list);
down_write(&dqopt->dqio_sem);
down_read(&dqopt->dqio_sem);
error = dqopt->ops[type]->read_file_info(sb, type);
if (error < 0) {
up_write(&dqopt->dqio_sem);
up_read(&dqopt->dqio_sem);
goto out_file_init;
}
if (dqopt->flags & DQUOT_QUOTA_SYS_FILE)
dqopt->info[type].dqi_flags |= DQF_SYS_FILE;
up_write(&dqopt->dqio_sem);
up_read(&dqopt->dqio_sem);
spin_lock(&dq_state_lock);
dqopt->flags |= dquot_state_flag(flags, type);
spin_unlock(&dq_state_lock);