bfs: kill BKL

Replace the BKL-based locking scheme used in the bfs driver by a private
filesystem-wide mutex.

Signed-off-by: Dmitri Vorobiev <dmitri.vorobiev@movial.fi>
Cc: Tigran Aivazian <tigran_aivazian@symantec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 15 insertions, 9 deletions

diff --git a/fs/bfs/inode.c b/fs/bfs/inode.c
index c8b3982e11ca..053e690ec9ed 100644
--- a/fs/bfs/inode.c
+++ b/fs/bfs/inode.c
@@ -104,6 +104,7 @@ static int bfs_write_inode(struct inode *inode, int unused)
         struct bfs_inode *di;
         struct buffer_head *bh;
         int block, off;
+        struct bfs_sb_info *info = BFS_SB(inode->i_sb);
 
         dprintf("ino=%08x\n", ino);
 
@@ -112,13 +113,13 @@ static int bfs_write_inode(struct inode *inode, int unused)
                 return -EIO;
         }
 
-        lock_kernel();
+        mutex_lock(&info->bfs_lock);
         block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
         bh = sb_bread(inode->i_sb, block);
         if (!bh) {
                 printf("Unable to read inode %s:%08x\n",
                                 inode->i_sb->s_id, ino);
-                unlock_kernel();
+                mutex_unlock(&info->bfs_lock);
                 return -EIO;
         }
 
@@ -145,7 +146,7 @@ static int bfs_write_inode(struct inode *inode, int unused)
 
         mark_buffer_dirty(bh);
         brelse(bh);
-        unlock_kernel();
+        mutex_unlock(&info->bfs_lock);
         return 0;
 }
 
@@ -170,7 +171,7 @@ static void bfs_delete_inode(struct inode *inode)
         
         inode->i_size = 0;
         inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
-        lock_kernel();
+        mutex_lock(&info->bfs_lock);
         mark_inode_dirty(inode);
 
         block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
@@ -178,7 +179,7 @@ static void bfs_delete_inode(struct inode *inode)
         if (!bh) {
                 printf("Unable to read inode %s:%08lx\n",
                                         inode->i_sb->s_id, ino);
-                unlock_kernel();
+                mutex_unlock(&info->bfs_lock);
                 return;
         }
         off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
@@ -204,14 +205,16 @@ static void bfs_delete_inode(struct inode *inode)
                 info->si_lf_eblk = bi->i_sblock - 1;
                 mark_buffer_dirty(info->si_sbh);
         }
-        unlock_kernel();
+        mutex_unlock(&info->bfs_lock);
         clear_inode(inode);
 }
 
 static void bfs_put_super(struct super_block *s)
 {
         struct bfs_sb_info *info = BFS_SB(s);
+
         brelse(info->si_sbh);
+        mutex_destroy(&info->bfs_lock);
         kfree(info->si_imap);
         kfree(info);
         s->s_fs_info = NULL;
@@ -236,11 +239,13 @@ static int bfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 
 static void bfs_write_super(struct super_block *s)
 {
-        lock_kernel();
+        struct bfs_sb_info *info = BFS_SB(s);
+
+        mutex_lock(&info->bfs_lock);
         if (!(s->s_flags & MS_RDONLY))
-                mark_buffer_dirty(BFS_SB(s)->si_sbh);
+                mark_buffer_dirty(info->si_sbh);
         s->s_dirt = 0;
-        unlock_kernel();
+        mutex_unlock(&info->bfs_lock);
 }
 
 static struct kmem_cache *bfs_inode_cachep;
@@ -409,6 +414,7 @@ static int bfs_fill_super(struct super_block *s, void *data, int silent)
                 s->s_dirt = 1;
         } 
         dump_imap("read_super", s);
+        mutex_init(&info->bfs_lock);
         return 0;
 
 out: