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Message-Id: <201010211550.34289.arnd@arndb.de>
Date: Thu, 21 Oct 2010 15:50:34 +0200
From: Arnd Bergmann <arnd@...db.de>
To: Christoph Hellwig <hch@...radead.org>,
Anders Larsen <al@...rsen.net>
Cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: [PATCH 1/2] BKL: remove BKL from qnx4
All uses of the BKL in qnx4 were the result of a pushdown into
code that doesn't really need it. As Christoph points out, this
is a read-only file system, which eliminates most of the races in
readdir/lookup.
Signed-off-by: Arnd Bergmann <arnd@...db.de>
Cc: Anders Larsen <al@...rsen.net>
Cc: Christoph Hellwig <hch@...radead.org>
---
fs/qnx4/dir.c | 3 ---
fs/qnx4/inode.c | 14 +-------------
fs/qnx4/namei.c | 4 ----
3 files changed, 1 insertions(+), 20 deletions(-)
diff --git a/fs/qnx4/dir.c b/fs/qnx4/dir.c
index 6e8fc62..06de116 100644
--- a/fs/qnx4/dir.c
+++ b/fs/qnx4/dir.c
@@ -11,7 +11,6 @@
* 20-06-1998 by Frank Denis : Linux 2.1.99+ & dcache support.
*/
-#include <linux/smp_lock.h>
#include <linux/buffer_head.h>
#include "qnx4.h"
@@ -29,8 +28,6 @@ static int qnx4_readdir(struct file *filp, void *dirent, filldir_t filldir)
QNX4DEBUG((KERN_INFO "qnx4_readdir:i_size = %ld\n", (long) inode->i_size));
QNX4DEBUG((KERN_INFO "filp->f_pos = %ld\n", (long) filp->f_pos));
- lock_kernel();
-
while (filp->f_pos < inode->i_size) {
blknum = qnx4_block_map( inode, filp->f_pos >> QNX4_BLOCK_SIZE_BITS );
bh = sb_bread(inode->i_sb, blknum);
diff --git a/fs/qnx4/inode.c b/fs/qnx4/inode.c
index 86a7be1..01bad30 100644
--- a/fs/qnx4/inode.c
+++ b/fs/qnx4/inode.c
@@ -16,7 +16,6 @@
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/highuid.h>
-#include <linux/smp_lock.h>
#include <linux/pagemap.h>
#include <linux/buffer_head.h>
#include <linux/writeback.h>
@@ -157,8 +156,6 @@ static int qnx4_statfs(struct dentry *dentry, struct kstatfs *buf)
struct super_block *sb = dentry->d_sb;
u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
- lock_kernel();
-
buf->f_type = sb->s_magic;
buf->f_bsize = sb->s_blocksize;
buf->f_blocks = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size) * 8;
@@ -168,8 +165,6 @@ static int qnx4_statfs(struct dentry *dentry, struct kstatfs *buf)
buf->f_fsid.val[0] = (u32)id;
buf->f_fsid.val[1] = (u32)(id >> 32);
- unlock_kernel();
-
return 0;
}
@@ -234,13 +229,9 @@ static int qnx4_fill_super(struct super_block *s, void *data, int silent)
struct qnx4_sb_info *qs;
int ret = -EINVAL;
- lock_kernel();
-
qs = kzalloc(sizeof(struct qnx4_sb_info), GFP_KERNEL);
- if (!qs) {
- unlock_kernel();
+ if (!qs)
return -ENOMEM;
- }
s->s_fs_info = qs;
sb_set_blocksize(s, QNX4_BLOCK_SIZE);
@@ -287,8 +278,6 @@ static int qnx4_fill_super(struct super_block *s, void *data, int silent)
goto outi;
brelse(bh);
-
- unlock_kernel();
return 0;
outi:
@@ -298,7 +287,6 @@ static int qnx4_fill_super(struct super_block *s, void *data, int silent)
outnobh:
kfree(qs);
s->s_fs_info = NULL;
- unlock_kernel();
return ret;
}
diff --git a/fs/qnx4/namei.c b/fs/qnx4/namei.c
index 58703eb..275327b 100644
--- a/fs/qnx4/namei.c
+++ b/fs/qnx4/namei.c
@@ -12,7 +12,6 @@
* 04-07-1998 by Frank Denis : first step for rmdir/unlink.
*/
-#include <linux/smp_lock.h>
#include <linux/buffer_head.h>
#include "qnx4.h"
@@ -109,7 +108,6 @@ struct dentry * qnx4_lookup(struct inode *dir, struct dentry *dentry, struct nam
int len = dentry->d_name.len;
struct inode *foundinode = NULL;
- lock_kernel();
if (!(bh = qnx4_find_entry(len, dir, name, &de, &ino)))
goto out;
/* The entry is linked, let's get the real info */
@@ -123,13 +121,11 @@ struct dentry * qnx4_lookup(struct inode *dir, struct dentry *dentry, struct nam
foundinode = qnx4_iget(dir->i_sb, ino);
if (IS_ERR(foundinode)) {
- unlock_kernel();
QNX4DEBUG((KERN_ERR "qnx4: lookup->iget -> error %ld\n",
PTR_ERR(foundinode)));
return ERR_CAST(foundinode);
}
out:
- unlock_kernel();
d_add(dentry, foundinode);
return NULL;
--
1.7.1
--
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