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authorDave Chinner <dchinner@redhat.com>2015-03-04 12:37:22 -0500
committerJosef Bacik <jbacik@fb.com>2015-08-17 18:39:46 -0400
commit74278da9f70d84d715601fe794567a6d2bfdf078 (patch)
tree49262a88fc42b85bfe4930f5cd7a832d5ba647c6 /fs/quota
parentcbedaac63481dea52327127a9f1c60f092bd6b07 (diff)
downloadop-kernel-dev-74278da9f70d84d715601fe794567a6d2bfdf078.zip
op-kernel-dev-74278da9f70d84d715601fe794567a6d2bfdf078.tar.gz
inode: convert inode_sb_list_lock to per-sb
The process of reducing contention on per-superblock inode lists starts with moving the locking to match the per-superblock inode list. This takes the global lock out of the picture and reduces the contention problems to within a single filesystem. This doesn't get rid of contention as the locks still have global CPU scope, but it does isolate operations on different superblocks form each other. Signed-off-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Josef Bacik <jbacik@fb.com> Reviewed-by: Jan Kara <jack@suse.cz> Reviewed-by: Christoph Hellwig <hch@lst.de> Tested-by: Dave Chinner <dchinner@redhat.com>
Diffstat (limited to 'fs/quota')
-rw-r--r--fs/quota/dquot.c16
1 files changed, 8 insertions, 8 deletions
diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index 20d1f74..2863ec6 100644
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -923,7 +923,7 @@ static void add_dquot_ref(struct super_block *sb, int type)
int reserved = 0;
#endif
- spin_lock(&inode_sb_list_lock);
+ spin_lock(&sb->s_inode_list_lock);
list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
spin_lock(&inode->i_lock);
if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) ||
@@ -934,7 +934,7 @@ static void add_dquot_ref(struct super_block *sb, int type)
}
__iget(inode);
spin_unlock(&inode->i_lock);
- spin_unlock(&inode_sb_list_lock);
+ spin_unlock(&sb->s_inode_list_lock);
#ifdef CONFIG_QUOTA_DEBUG
if (unlikely(inode_get_rsv_space(inode) > 0))
@@ -946,15 +946,15 @@ static void add_dquot_ref(struct super_block *sb, int type)
/*
* We hold a reference to 'inode' so it couldn't have been
* removed from s_inodes list while we dropped the
- * inode_sb_list_lock We cannot iput the inode now as we can be
+ * s_inode_list_lock. We cannot iput the inode now as we can be
* holding the last reference and we cannot iput it under
- * inode_sb_list_lock. So we keep the reference and iput it
+ * s_inode_list_lock. So we keep the reference and iput it
* later.
*/
old_inode = inode;
- spin_lock(&inode_sb_list_lock);
+ spin_lock(&sb->s_inode_list_lock);
}
- spin_unlock(&inode_sb_list_lock);
+ spin_unlock(&sb->s_inode_list_lock);
iput(old_inode);
#ifdef CONFIG_QUOTA_DEBUG
@@ -1023,7 +1023,7 @@ static void remove_dquot_ref(struct super_block *sb, int type,
struct inode *inode;
int reserved = 0;
- spin_lock(&inode_sb_list_lock);
+ spin_lock(&sb->s_inode_list_lock);
list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
/*
* We have to scan also I_NEW inodes because they can already
@@ -1039,7 +1039,7 @@ static void remove_dquot_ref(struct super_block *sb, int type,
}
spin_unlock(&dq_data_lock);
}
- spin_unlock(&inode_sb_list_lock);
+ spin_unlock(&sb->s_inode_list_lock);
#ifdef CONFIG_QUOTA_DEBUG
if (reserved) {
printk(KERN_WARNING "VFS (%s): Writes happened after quota"
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