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authorArnd Bergmann <arnd@arndb.de>2011-01-22 20:26:12 +0100
committerArnd Bergmann <arnd@arndb.de>2011-03-02 22:27:36 +0100
commit9a311b96c3065f362e3348cb5d7af1a57ca6bff9 (patch)
treeaed281e9ff7c5e689895ff838e886dff77e3e2e9 /fs/hpfs/super.c
parent5edc341313a188d94cde7ef87ac31647cea8601a (diff)
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hpfs: remove the BKL
This removes the BKL in hpfs in a rather awful way, by making the code only work on uniprocessor systems without kernel preemption, as suggested by Andi Kleen. The HPFS code probably has close to zero remaining users on current kernels, all archeological uses of the file system can probably be done with the significant restrictions. The hpfs_lock/hpfs_unlock functions are left in the code, sincen Mikulas has indicated that he is still interested in fixing it in a better way. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Andi Kleen <ak@linux.intel.com> Cc: Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz> Cc: linux-fsdevel@vger.kernel.org
Diffstat (limited to 'fs/hpfs/super.c')
-rw-r--r--fs/hpfs/super.c23
1 files changed, 9 insertions, 14 deletions
diff --git a/fs/hpfs/super.c b/fs/hpfs/super.c
index b30426b1fc97..c89b40808587 100644
--- a/fs/hpfs/super.c
+++ b/fs/hpfs/super.c
@@ -13,7 +13,6 @@
#include <linux/statfs.h>
#include <linux/magic.h>
#include <linux/sched.h>
-#include <linux/smp_lock.h>
#include <linux/bitmap.h>
#include <linux/slab.h>
@@ -103,15 +102,11 @@ static void hpfs_put_super(struct super_block *s)
{
struct hpfs_sb_info *sbi = hpfs_sb(s);
- lock_kernel();
-
kfree(sbi->sb_cp_table);
kfree(sbi->sb_bmp_dir);
unmark_dirty(s);
s->s_fs_info = NULL;
kfree(sbi);
-
- unlock_kernel();
}
unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
@@ -143,7 +138,7 @@ static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
struct super_block *s = dentry->d_sb;
struct hpfs_sb_info *sbi = hpfs_sb(s);
u64 id = huge_encode_dev(s->s_bdev->bd_dev);
- lock_kernel();
+ hpfs_lock(s);
/*if (sbi->sb_n_free == -1) {*/
sbi->sb_n_free = count_bitmaps(s);
@@ -160,7 +155,7 @@ static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
buf->f_fsid.val[1] = (u32)(id >> 32);
buf->f_namelen = 254;
- unlock_kernel();
+ hpfs_unlock(s);
return 0;
}
@@ -406,7 +401,7 @@ static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
*flags |= MS_NOATIME;
- lock_kernel();
+ hpfs_lock(s);
lock_super(s);
uid = sbi->sb_uid; gid = sbi->sb_gid;
umask = 0777 & ~sbi->sb_mode;
@@ -441,12 +436,12 @@ static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
replace_mount_options(s, new_opts);
unlock_super(s);
- unlock_kernel();
+ hpfs_unlock(s);
return 0;
out_err:
unlock_super(s);
- unlock_kernel();
+ hpfs_unlock(s);
kfree(new_opts);
return -EINVAL;
}
@@ -484,13 +479,15 @@ static int hpfs_fill_super(struct super_block *s, void *options, int silent)
int o;
- lock_kernel();
+ if (num_possible_cpus() > 1) {
+ printk(KERN_ERR "HPFS is not SMP safe\n");
+ return -EINVAL;
+ }
save_mount_options(s, options);
sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
if (!sbi) {
- unlock_kernel();
return -ENOMEM;
}
s->s_fs_info = sbi;
@@ -677,7 +674,6 @@ static int hpfs_fill_super(struct super_block *s, void *options, int silent)
root->i_blocks = 5;
hpfs_brelse4(&qbh);
}
- unlock_kernel();
return 0;
bail4: brelse(bh2);
@@ -689,7 +685,6 @@ bail0:
kfree(sbi->sb_cp_table);
s->s_fs_info = NULL;
kfree(sbi);
- unlock_kernel();
return -EINVAL;
}