BKL: Remove BKL from NILFS2

The BKL is only used in put_super, fill_super and remount_fs that are all
three protected by the superblocks s_umount rw_semaphore. Therefore it is
safe to remove the BKL entirely.

Signed-off-by: Jan Blunck <jblunck@infradead.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

diff --git a/fs/nilfs2/ioctl.c b/fs/nilfs2/ioctl.c
index f90a33d..0442ee3 100644 (file)
--- a/fs/nilfs2/ioctl.c
+++ b/fs/nilfs2/ioctl.c
@@ -22,7 +22,6 @@
 
 #include <linux/fs.h>
 #include <linux/wait.h>
-#include <linux/smp_lock.h>    /* lock_kernel(), unlock_kernel() */
 #include <linux/slab.h>
 #include <linux/capability.h>  /* capable() */
 #include <linux/uaccess.h>     /* copy_from_user(), copy_to_user() */

diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c
index 0d573c2..9f4913f 100644 (file)
--- a/fs/nilfs2/super.c
+++ b/fs/nilfs2/super.c
@@ -45,7 +45,6 @@
 #include <linux/parser.h>
 #include <linux/random.h>
 #include <linux/crc32.h>
-#include <linux/smp_lock.h>
 #include <linux/vfs.h>
 #include <linux/writeback.h>
 #include <linux/kobject.h>
@@ -342,8 +341,6 @@ static void nilfs_put_super(struct super_block *sb)
        struct nilfs_sb_info *sbi = NILFS_SB(sb);
        struct the_nilfs *nilfs = sbi->s_nilfs;
 
-       lock_kernel();
-
        nilfs_detach_segment_constructor(sbi);
 
        if (!(sb->s_flags & MS_RDONLY)) {
@@ -361,8 +358,6 @@ static void nilfs_put_super(struct super_block *sb)
        sbi->s_super = NULL;
        sb->s_fs_info = NULL;
        nilfs_put_sbinfo(sbi);
-
-       unlock_kernel();
 }
 
 static int nilfs_sync_fs(struct super_block *sb, int wait)
@@ -949,8 +944,6 @@ static int nilfs_remount(struct super_block *sb, int *flags, char *data)
        struct nilfs_mount_options old_opts;
        int was_snapshot, err;
 
-       lock_kernel();
-
        down_write(&nilfs->ns_super_sem);
        old_sb_flags = sb->s_flags;
        old_opts.mount_opt = sbi->s_mount_opt;
@@ -1024,7 +1017,6 @@ static int nilfs_remount(struct super_block *sb, int *flags, char *data)
        }
  out:
        up_write(&nilfs->ns_super_sem);
-       unlock_kernel();
        return 0;
 
  restore_opts:
@@ -1032,7 +1024,6 @@ static int nilfs_remount(struct super_block *sb, int *flags, char *data)
        sbi->s_mount_opt = old_opts.mount_opt;
        sbi->s_snapshot_cno = old_opts.snapshot_cno;
        up_write(&nilfs->ns_super_sem);
-       unlock_kernel();
        return err;
 }
 
@@ -1113,12 +1104,9 @@ nilfs_get_sb(struct file_system_type *fs_type, int flags,
        if (!(flags & MS_RDONLY))
                mode |= FMODE_WRITE;
 
-       lock_kernel();
        sd.bdev = open_bdev_exclusive(dev_name, mode, fs_type);
-       if (IS_ERR(sd.bdev)) {
-               unlock_kernel();
+       if (IS_ERR(sd.bdev))
                return PTR_ERR(sd.bdev);
-       }
 
        /*
         * To get mount instance using sget() vfs-routine, NILFS needs
@@ -1201,7 +1189,6 @@ nilfs_get_sb(struct file_system_type *fs_type, int flags,
        if (need_to_close)
                close_bdev_exclusive(sd.bdev, mode);
        simple_set_mnt(mnt, s);
-       unlock_kernel();
        return 0;
 
  failed_unlock:
@@ -1209,8 +1196,6 @@ nilfs_get_sb(struct file_system_type *fs_type, int flags,
        put_nilfs(nilfs);
  failed:
        close_bdev_exclusive(sd.bdev, mode);
-
-       unlock_kernel();
        return err;
 
  cancel_new:
@@ -1223,7 +1208,6 @@ nilfs_get_sb(struct file_system_type *fs_type, int flags,
         * We must finish all post-cleaning before this call;
         * put_nilfs() needs the block device.
         */
-       unlock_kernel();
        return err;
 }