ceph: quota: add counter for snaprealms with quota

By keeping a counter with the number of snaprealms that have quota set
allows to optimize the functions that need to walk throught the realms
hierarchy looking for quotas.  Thus, if this counter is zero it's safe to
assume that there are no realms with quota.

Signed-off-by: Luis Henriques <lhenriques@suse.com>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

1 files changed, 24 insertions, 5 deletions

diff --git a/fs/ceph/quota.c b/fs/ceph/quota.c
index c561a85ea8b1..588744b4665f 100644
--- a/fs/ceph/quota.c
+++ b/fs/ceph/quota.c
@@ -21,9 +21,19 @@
 #include "super.h"
 #include "mds_client.h"
 
-static inline bool ceph_has_quota(struct ceph_inode_info *ci)
+void ceph_adjust_quota_realms_count(struct inode *inode, bool inc)
 {
-	return (ci && (ci->i_max_files || ci->i_max_bytes));
+	struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
+	if (inc)
+		atomic64_inc(&mdsc->quotarealms_count);
+	else
+		atomic64_dec(&mdsc->quotarealms_count);
+}
+
+static inline bool ceph_has_realms_with_quotas(struct inode *inode)
+{
+	struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
+	return atomic64_read(&mdsc->quotarealms_count) > 0;
 }
 
 void ceph_handle_quota(struct ceph_mds_client *mdsc,
@@ -62,8 +72,8 @@ void ceph_handle_quota(struct ceph_mds_client *mdsc,
 	ci->i_rbytes = le64_to_cpu(h->rbytes);
 	ci->i_rfiles = le64_to_cpu(h->rfiles);
 	ci->i_rsubdirs = le64_to_cpu(h->rsubdirs);
-	ci->i_max_bytes = le64_to_cpu(h->max_bytes);
-	ci->i_max_files = le64_to_cpu(h->max_files);
+	__ceph_update_quota(ci, le64_to_cpu(h->max_bytes),
+		            le64_to_cpu(h->max_files));
 	spin_unlock(&ci->i_ceph_lock);
 
 	iput(inode);
@@ -103,7 +113,7 @@ static struct ceph_snap_realm *get_quota_realm(struct ceph_mds_client *mdsc,
 			break;
 
 		ci = ceph_inode(in);
-		has_quota = ceph_has_quota(ci);
+		has_quota = __ceph_has_any_quota(ci);
 		iput(in);
 
 		next = realm->parent;
@@ -241,6 +251,9 @@ static bool check_quota_exceeded(struct inode *inode, enum quota_check_op op,
  */
 bool ceph_quota_is_max_files_exceeded(struct inode *inode)
 {
+	if (!ceph_has_realms_with_quotas(inode))
+		return false;
+
 	WARN_ON(!S_ISDIR(inode->i_mode));
 
 	return check_quota_exceeded(inode, QUOTA_CHECK_MAX_FILES_OP, 0);
@@ -258,6 +271,9 @@ bool ceph_quota_is_max_bytes_exceeded(struct inode *inode, loff_t newsize)
 {
 	loff_t size = i_size_read(inode);
 
+	if (!ceph_has_realms_with_quotas(inode))
+		return false;
+
 	/* return immediately if we're decreasing file size */
 	if (newsize <= size)
 		return false;
@@ -277,6 +293,9 @@ bool ceph_quota_is_max_bytes_approaching(struct inode *inode, loff_t newsize)
 {
 	loff_t size = ceph_inode(inode)->i_reported_size;
 
+	if (!ceph_has_realms_with_quotas(inode))
+		return false;
+
 	/* return immediately if we're decreasing file size */
 	if (newsize <= size)
 		return false;