inode: move to per-sb LRU locks

With the inode LRUs moving to per-sb structures, there is no longer
a need for a global inode_lru_lock. The locking can be made more
fine-grained by moving to a per-sb LRU lock, isolating the LRU
operations of different filesytsems completely from each other.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

3 files changed, 16 insertions, 15 deletions

diff --git a/fs/inode.c b/fs/inode.c
index 8c3491302e0c..0450e25aeda0 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -33,7 +33,7 @@
  *
  * inode->i_lock protects:
  *   inode->i_state, inode->i_hash, __iget()
- * inode_lru_lock protects:
+ * inode->i_sb->s_inode_lru_lock protects:
  *   inode->i_sb->s_inode_lru, inode->i_lru
  * inode_sb_list_lock protects:
  *   sb->s_inodes, inode->i_sb_list
@@ -46,7 +46,7 @@
  *
  * inode_sb_list_lock
  *   inode->i_lock
- *     inode_lru_lock
+ *     inode->i_sb->s_inode_lru_lock
  *
  * inode_wb_list_lock
  *   inode->i_lock
@@ -64,8 +64,6 @@ static unsigned int i_hash_shift __read_mostly;
 static struct hlist_head *inode_hashtable __read_mostly;
 static __cacheline_aligned_in_smp DEFINE_SPINLOCK(inode_hash_lock);
 
-static DEFINE_SPINLOCK(inode_lru_lock);
-
 __cacheline_aligned_in_smp DEFINE_SPINLOCK(inode_sb_list_lock);
 __cacheline_aligned_in_smp DEFINE_SPINLOCK(inode_wb_list_lock);
 
@@ -342,24 +340,24 @@ EXPORT_SYMBOL(ihold);
 
 static void inode_lru_list_add(struct inode *inode)
 {
-        spin_lock(&inode_lru_lock);
+        spin_lock(&inode->i_sb->s_inode_lru_lock);
         if (list_empty(&inode->i_lru)) {
                 list_add(&inode->i_lru, &inode->i_sb->s_inode_lru);
                 inode->i_sb->s_nr_inodes_unused++;
                 this_cpu_inc(nr_unused);
         }
-        spin_unlock(&inode_lru_lock);
+        spin_unlock(&inode->i_sb->s_inode_lru_lock);
 }
 
 static void inode_lru_list_del(struct inode *inode)
 {
-        spin_lock(&inode_lru_lock);
+        spin_lock(&inode->i_sb->s_inode_lru_lock);
         if (!list_empty(&inode->i_lru)) {
                 list_del_init(&inode->i_lru);
                 inode->i_sb->s_nr_inodes_unused--;
                 this_cpu_dec(nr_unused);
         }
-        spin_unlock(&inode_lru_lock);
+        spin_unlock(&inode->i_sb->s_inode_lru_lock);
 }
 
 /**
@@ -615,7 +613,8 @@ static int can_unuse(struct inode *inode)
 
 /*
  * Scan `goal' inodes on the unused list for freeable ones. They are moved to a
- * temporary list and then are freed outside inode_lru_lock by dispose_list().
+ * temporary list and then are freed outside sb->s_inode_lru_lock by
+ * dispose_list().
  *
  * Any inodes which are pinned purely because of attached pagecache have their
  * pagecache removed.  If the inode has metadata buffers attached to
@@ -635,7 +634,7 @@ static void shrink_icache_sb(struct super_block *sb, int *nr_to_scan)
         int nr_scanned;
         unsigned long reap = 0;
 
-        spin_lock(&inode_lru_lock);
+        spin_lock(&sb->s_inode_lru_lock);
         for (nr_scanned = *nr_to_scan; nr_scanned >= 0; nr_scanned--) {
                 struct inode *inode;
 
@@ -645,7 +644,7 @@ static void shrink_icache_sb(struct super_block *sb, int *nr_to_scan)
                 inode = list_entry(sb->s_inode_lru.prev, struct inode, i_lru);
 
                 /*
-                 * we are inverting the inode_lru_lock/inode->i_lock here,
+                 * we are inverting the sb->s_inode_lru_lock/inode->i_lock here,
                  * so use a trylock. If we fail to get the lock, just move the
                  * inode to the back of the list so we don't spin on it.
                  */
@@ -677,12 +676,12 @@ static void shrink_icache_sb(struct super_block *sb, int *nr_to_scan)
                 if (inode_has_buffers(inode) || inode->i_data.nrpages) {
                         __iget(inode);
                         spin_unlock(&inode->i_lock);
-                        spin_unlock(&inode_lru_lock);
+                        spin_unlock(&sb->s_inode_lru_lock);
                         if (remove_inode_buffers(inode))
                                 reap += invalidate_mapping_pages(&inode->i_data,
                                                                 0, -1);
                         iput(inode);
-                        spin_lock(&inode_lru_lock);
+                        spin_lock(&sb->s_inode_lru_lock);
 
                         if (inode != list_entry(sb->s_inode_lru.next,
                                                 struct inode, i_lru))
@@ -707,7 +706,7 @@ static void shrink_icache_sb(struct super_block *sb, int *nr_to_scan)
                 __count_vm_events(KSWAPD_INODESTEAL, reap);
         else
                 __count_vm_events(PGINODESTEAL, reap);
-        spin_unlock(&inode_lru_lock);
+        spin_unlock(&sb->s_inode_lru_lock);
         *nr_to_scan = nr_scanned;
 
         dispose_list(&freeable);
diff --git a/fs/super.c b/fs/super.c
index e8e6dbfefe8c..73ab9f9b3571 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -78,6 +78,7 @@ static struct super_block *alloc_super(struct file_system_type *type)
                 INIT_LIST_HEAD(&s->s_inodes);
                 INIT_LIST_HEAD(&s->s_dentry_lru);
                 INIT_LIST_HEAD(&s->s_inode_lru);
+                spin_lock_init(&s->s_inode_lru_lock);
                 init_rwsem(&s->s_umount);
                 mutex_init(&s->s_lock);
                 lockdep_set_class(&s->s_umount, &type->s_umount_key);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 9724f0a48742..460d2cc21ec6 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1397,7 +1397,8 @@ struct super_block {
         struct list_head        s_dentry_lru;   /* unused dentry lru */
         int                     s_nr_dentry_unused;     /* # of dentry on lru */
 
-        /* inode_lru_lock protects s_inode_lru and s_nr_inodes_unused */
+        /* s_inode_lru_lock protects s_inode_lru and s_nr_inodes_unused */
+        spinlock_t              s_inode_lru_lock ____cacheline_aligned_in_smp;
         struct list_head        s_inode_lru;            /* unused inode lru */
         int                     s_nr_inodes_unused;     /* # of inodes on lru */