quota: remove dqptr_sem

Remove dqptr_sem to make quota code scalable: Remove the dqptr_sem,
accessing inode->i_dquot now protected by dquot_srcu, and changing
inode->i_dquot is now serialized by dq_data_lock.

Signed-off-by: Lai Siyao <lai.siyao@intel.com>
Signed-off-by: Niu Yawei <yawei.niu@intel.com>
Signed-off-by: Jan Kara <jack@suse.cz>

1 files changed, 0 insertions, 1 deletions

diff --git a/include/linux/quota.h b/include/linux/quota.h
index 0f3c5d38da1f..80d345a3524c 100644
--- a/include/linux/quota.h
+++ b/include/linux/quota.h
@@ -390,7 +390,6 @@ struct quota_info {
         unsigned int flags;                     /* Flags for diskquotas on this device */
         struct mutex dqio_mutex;                /* lock device while I/O in progress */
         struct mutex dqonoff_mutex;             /* Serialize quotaon & quotaoff */
-        struct rw_semaphore dqptr_sem;          /* serialize ops using quota_info struct, pointers from inode to dquots */
         struct inode *files[MAXQUOTAS];         /* inodes of quotafiles */
         struct mem_dqinfo info[MAXQUOTAS];      /* Information for each quota type */
         const struct quota_format_ops *ops[MAXQUOTAS];  /* Operations for each type */