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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/notify
parentcbedaac63481dea52327127a9f1c60f092bd6b07 (diff)
downloadlinux-74278da9f70d84d715601fe794567a6d2bfdf078.tar.bz2
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/notify')
-rw-r--r--fs/notify/inode_mark.c20
1 files changed, 10 insertions, 10 deletions
diff --git a/fs/notify/inode_mark.c b/fs/notify/inode_mark.c
index 3daf513ee99e..a4e1a8f6c329 100644
--- a/fs/notify/inode_mark.c
+++ b/fs/notify/inode_mark.c
@@ -163,17 +163,17 @@ int fsnotify_add_inode_mark(struct fsnotify_mark *mark,
/**
* fsnotify_unmount_inodes - an sb is unmounting. handle any watched inodes.
- * @list: list of inodes being unmounted (sb->s_inodes)
+ * @sb: superblock being unmounted.
*
* Called during unmount with no locks held, so needs to be safe against
- * concurrent modifiers. We temporarily drop inode_sb_list_lock and CAN block.
+ * concurrent modifiers. We temporarily drop sb->s_inode_list_lock and CAN block.
*/
-void fsnotify_unmount_inodes(struct list_head *list)
+void fsnotify_unmount_inodes(struct super_block *sb)
{
struct inode *inode, *next_i, *need_iput = NULL;
- spin_lock(&inode_sb_list_lock);
- list_for_each_entry_safe(inode, next_i, list, i_sb_list) {
+ spin_lock(&sb->s_inode_list_lock);
+ list_for_each_entry_safe(inode, next_i, &sb->s_inodes, i_sb_list) {
struct inode *need_iput_tmp;
/*
@@ -209,7 +209,7 @@ void fsnotify_unmount_inodes(struct list_head *list)
spin_unlock(&inode->i_lock);
/* In case the dropping of a reference would nuke next_i. */
- while (&next_i->i_sb_list != list) {
+ while (&next_i->i_sb_list != &sb->s_inodes) {
spin_lock(&next_i->i_lock);
if (!(next_i->i_state & (I_FREEING | I_WILL_FREE)) &&
atomic_read(&next_i->i_count)) {
@@ -224,12 +224,12 @@ void fsnotify_unmount_inodes(struct list_head *list)
}
/*
- * We can safely drop inode_sb_list_lock here because either
+ * We can safely drop s_inode_list_lock here because either
* we actually hold references on both inode and next_i or
* end of list. Also no new inodes will be added since the
* umount has begun.
*/
- spin_unlock(&inode_sb_list_lock);
+ spin_unlock(&sb->s_inode_list_lock);
if (need_iput_tmp)
iput(need_iput_tmp);
@@ -241,7 +241,7 @@ void fsnotify_unmount_inodes(struct list_head *list)
iput(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);
}