This simple patch includes serveral improvements:
1. iget5_locked in bdget really needs blockdev_superblock, instead of bd_mnt,
so bd_mnt could be just a local variable;
2. blockdev_superblock really needs __read_mostly, while local var bd_mnt not;
3. make use of sb_is_blkdev_sb in bd_forget, instead of direct reference to
blockdev_superblock.
Signed-off-by: Denis ChengRq <crquan@xxxxxxxxx>
---
fs/block_dev.c | 9 +++++----
1 files changed, 5 insertions(+), 4 deletions(-)
diff --git a/fs/block_dev.c b/fs/block_dev.c
index aff5421..6d8a3ca 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -326,12 +326,13 @@ static struct file_system_type bd_type = {
.kill_sb = kill_anon_super,
};
-static struct vfsmount *bd_mnt __read_mostly;
-struct super_block *blockdev_superblock;
+struct super_block *blockdev_superblock __read_mostly;
void __init bdev_cache_init(void)
{
int err;
+ struct vfsmount *bd_mnt;
+
bdev_cachep = kmem_cache_create("bdev_cache", sizeof(struct bdev_inode),
0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
SLAB_MEM_SPREAD|SLAB_PANIC),
@@ -373,7 +374,7 @@ struct block_device *bdget(dev_t dev)
struct block_device *bdev;
struct inode *inode;
- inode = iget5_locked(bd_mnt->mnt_sb, hash(dev),
+ inode = iget5_locked(blockdev_superblock, hash(dev),
bdev_test, bdev_set, &dev);
if (!inode)
@@ -463,7 +464,7 @@ void bd_forget(struct inode *inode)
spin_lock(&bdev_lock);
if (inode->i_bdev) {
- if (inode->i_sb != blockdev_superblock)
+ if (!sb_is_blkdev_sb(inode->i_sb))
bdev = inode->i_bdev;
__bd_forget(inode);
}
--
1.5.6.3
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