f2fs: replace rw semaphore extent_tree_lock with mutex lock
This patch replace rw semaphore extent_tree_lock with mutex lock
for no read cases with this lock.
Signed-off-by: Yunlei He <heyunlei@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
diff --git a/fs/f2fs/extent_cache.c b/fs/f2fs/extent_cache.c
index 6ed6424..0ab5518 100644
--- a/fs/f2fs/extent_cache.c
+++ b/fs/f2fs/extent_cache.c
@@ -77,7 +77,7 @@
struct extent_tree *et;
nid_t ino = inode->i_ino;
- down_write(&sbi->extent_tree_lock);
+ mutex_lock(&sbi->extent_tree_lock);
et = radix_tree_lookup(&sbi->extent_tree_root, ino);
if (!et) {
et = f2fs_kmem_cache_alloc(extent_tree_slab, GFP_NOFS);
@@ -94,7 +94,7 @@
atomic_dec(&sbi->total_zombie_tree);
list_del_init(&et->list);
}
- up_write(&sbi->extent_tree_lock);
+ mutex_unlock(&sbi->extent_tree_lock);
/* never died until evict_inode */
F2FS_I(inode)->extent_tree = et;
@@ -548,7 +548,7 @@
if (!atomic_read(&sbi->total_zombie_tree))
goto free_node;
- if (!down_write_trylock(&sbi->extent_tree_lock))
+ if (!mutex_trylock(&sbi->extent_tree_lock))
goto out;
/* 1. remove unreferenced extent tree */
@@ -570,11 +570,11 @@
goto unlock_out;
cond_resched();
}
- up_write(&sbi->extent_tree_lock);
+ mutex_unlock(&sbi->extent_tree_lock);
free_node:
/* 2. remove LRU extent entries */
- if (!down_write_trylock(&sbi->extent_tree_lock))
+ if (!mutex_trylock(&sbi->extent_tree_lock))
goto out;
remained = nr_shrink - (node_cnt + tree_cnt);
@@ -604,7 +604,7 @@
spin_unlock(&sbi->extent_lock);
unlock_out:
- up_write(&sbi->extent_tree_lock);
+ mutex_unlock(&sbi->extent_tree_lock);
out:
trace_f2fs_shrink_extent_tree(sbi, node_cnt, tree_cnt);
@@ -651,10 +651,10 @@
if (inode->i_nlink && !is_bad_inode(inode) &&
atomic_read(&et->node_cnt)) {
- down_write(&sbi->extent_tree_lock);
+ mutex_lock(&sbi->extent_tree_lock);
list_add_tail(&et->list, &sbi->zombie_list);
atomic_inc(&sbi->total_zombie_tree);
- up_write(&sbi->extent_tree_lock);
+ mutex_unlock(&sbi->extent_tree_lock);
return;
}
@@ -662,12 +662,12 @@
node_cnt = f2fs_destroy_extent_node(inode);
/* delete extent tree entry in radix tree */
- down_write(&sbi->extent_tree_lock);
+ mutex_lock(&sbi->extent_tree_lock);
f2fs_bug_on(sbi, atomic_read(&et->node_cnt));
radix_tree_delete(&sbi->extent_tree_root, inode->i_ino);
kmem_cache_free(extent_tree_slab, et);
atomic_dec(&sbi->total_ext_tree);
- up_write(&sbi->extent_tree_lock);
+ mutex_unlock(&sbi->extent_tree_lock);
F2FS_I(inode)->extent_tree = NULL;
@@ -714,7 +714,7 @@
void init_extent_cache_info(struct f2fs_sb_info *sbi)
{
INIT_RADIX_TREE(&sbi->extent_tree_root, GFP_NOIO);
- init_rwsem(&sbi->extent_tree_lock);
+ mutex_init(&sbi->extent_tree_lock);
INIT_LIST_HEAD(&sbi->extent_list);
spin_lock_init(&sbi->extent_lock);
atomic_set(&sbi->total_ext_tree, 0);
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 6efb2d9..e26cc69 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -844,7 +844,7 @@
/* for extent tree cache */
struct radix_tree_root extent_tree_root;/* cache extent cache entries */
- struct rw_semaphore extent_tree_lock; /* locking extent radix tree */
+ struct mutex extent_tree_lock; /* locking extent radix tree */
struct list_head extent_list; /* lru list for shrinker */
spinlock_t extent_lock; /* locking extent lru list */
atomic_t total_ext_tree; /* extent tree count */