BKL: Remove BKL from OCFS2

The BKL in ocfs2/dlmfs is used in put_super, fill_super and remount_fs
that are all three protected by the superblocks s_umount rw_semaphore.

The use in ocfs2_control_open is evidently unrelated and the function
is protected by ocfs2_control_lock.

Therefore it is safe to remove the BKL entirely.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Joel Becker <joel.becker@oracle.com>

3 files changed, 1 insertions, 23 deletions

diff --git a/fs/ocfs2/dlmfs/dlmfs.c b/fs/ocfs2/dlmfs/dlmfs.c
index 667d7ceba8c9..c2903b84bb7a 100644
--- a/fs/ocfs2/dlmfs/dlmfs.c
+++ b/fs/ocfs2/dlmfs/dlmfs.c
@@ -44,7 +44,6 @@
 #include <linux/string.h>
 #include <linux/backing-dev.h>
 #include <linux/poll.h>
-#include <linux/smp_lock.h>
 
 #include <asm/uaccess.h>
 
@@ -589,27 +588,21 @@ static int dlmfs_fill_super(struct super_block * sb,
         struct inode * inode;
         struct dentry * root;
 
-        lock_kernel();
-
         sb->s_maxbytes = MAX_LFS_FILESIZE;
         sb->s_blocksize = PAGE_CACHE_SIZE;
         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
         sb->s_magic = DLMFS_MAGIC;
         sb->s_op = &dlmfs_ops;
         inode = dlmfs_get_root_inode(sb);
-        if (!inode) {
-                unlock_kernel();
+        if (!inode)
                 return -ENOMEM;
-        }
 
         root = d_alloc_root(inode);
         if (!root) {
                 iput(inode);
-                unlock_kernel();
                 return -ENOMEM;
         }
         sb->s_root = root;
-        unlock_kernel();
         return 0;
 }
 
diff --git a/fs/ocfs2/stack_user.c b/fs/ocfs2/stack_user.c
index 2dc57bca0688..0e68f542ef2e 100644
--- a/fs/ocfs2/stack_user.c
+++ b/fs/ocfs2/stack_user.c
@@ -22,7 +22,6 @@
 #include <linux/miscdevice.h>
 #include <linux/mutex.h>
 #include <linux/slab.h>
-#include <linux/smp_lock.h>
 #include <linux/reboot.h>
 #include <asm/uaccess.h>
 
@@ -612,12 +611,10 @@ static int ocfs2_control_open(struct inode *inode, struct file *file)
                 return -ENOMEM;
         p->op_this_node = -1;
 
-        lock_kernel();
         mutex_lock(&ocfs2_control_lock);
         file->private_data = p;
         list_add(&p->op_list, &ocfs2_control_private_list);
         mutex_unlock(&ocfs2_control_lock);
-        unlock_kernel();
 
         return 0;
 }
diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index b7e4f2d19d40..b7d724393b5a 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -609,8 +609,6 @@ static int ocfs2_remount(struct super_block *sb, int *flags, char *data)
         struct mount_options parsed_options;
         struct ocfs2_super *osb = OCFS2_SB(sb);
 
-        lock_kernel();
-
         if (!ocfs2_parse_options(sb, data, &parsed_options, 1) ||
             !ocfs2_check_set_options(sb, &parsed_options)) {
                 ret = -EINVAL;
@@ -717,7 +715,6 @@ unlock_osb:
                                                         MS_POSIXACL : 0);
         }
 out:
-        unlock_kernel();
         return ret;
 }
 
@@ -1002,8 +999,6 @@ static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
         char nodestr[8];
         struct ocfs2_blockcheck_stats stats;
 
-        lock_kernel();
-
         mlog_entry("%p, %p, %i", sb, data, silent);
 
         if (!ocfs2_parse_options(sb, data, &parsed_options, 0)) {
@@ -1181,7 +1176,6 @@ static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
                         atomic_set(&osb->vol_state, VOLUME_DISABLED);
                         wake_up(&osb->osb_mount_event);
                         mlog_exit(status);
-                        unlock_kernel();
                         return status;
                 }
         }
@@ -1196,7 +1190,6 @@ static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
         ocfs2_orphan_scan_start(osb);
 
         mlog_exit(status);
-        unlock_kernel();
         return status;
 
 read_super_error:
@@ -1212,7 +1205,6 @@ read_super_error:
         }
 
         mlog_exit(status);
-        unlock_kernel();
         return status;
 }
 
@@ -1645,13 +1637,9 @@ static void ocfs2_put_super(struct super_block *sb)
 {
         mlog_entry("(0x%p)\n", sb);
 
-        lock_kernel();
-
         ocfs2_sync_blockdev(sb);
         ocfs2_dismount_volume(sb, 0);
 
-        unlock_kernel();
-
         mlog_exit_void();
 }