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quota: Remove locking for reading from the old quota format 

The old quota format has fixed offset in quota file based on ID so
there's no locking needed against concurrent modifications of the file
(locking against concurrent IO on the same dquot is still provided by
dq_lock).

Reviewed-by: Andreas Dilger <adilger@dilger.ca>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara 2017-06-08 15:43:13 +02:00
parent e342e38df9
commit 47cdc11dee
1 changed files with 0 additions and 2 deletions
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2
fs/quota/quota_v1.c
View File

@ -61,7 +61,6 @@ static int v1_read_dqblk(struct dquot *dquot)
if (!dqopt->files[type])
return -EINVAL;
down_read(&dqopt->dqio_sem);
/* Set structure to 0s in case read fails/is after end of file */
memset(&dqblk, 0, sizeof(struct v1_disk_dqblk));
dquot->dq_sb->s_op->quota_read(dquot->dq_sb, type, (char *)&dqblk,
@ -75,7 +74,6 @@ static int v1_read_dqblk(struct dquot *dquot)
dquot->dq_dqb.dqb_isoftlimit == 0)
set_bit(DQ_FAKE_B, &dquot->dq_flags);
dqstats_inc(DQST_READS);
up_read(&dqopt->dqio_sem);
return 0;
}