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authorJan Blunck <jblunck@suse.de>2010-04-14 14:38:39 +0200
committerJan Kara <jack@suse.cz>2010-05-21 19:30:40 +0200
commite0a5cbac029db69032758000c67465c2ed7a5736 (patch)
tree14d81b8fee8d43674acd4c63a2e994bdc3da774c /fs/ext2/super.c
parentc15271f4e74cd6dbdf461335d6d1450949c4b956 (diff)
BKL: Remove BKL from ext2 filesystem
The BKL is still used in ext2_put_super(), ext2_fill_super(), ext2_sync_fs() ext2_remount() and ext2_write_inode(). From these calls ext2_put_super(), ext2_fill_super() and ext2_remount() are protected against each other by the struct super_block s_umount rw semaphore. The call in ext2_write_inode() could only protect the modification of the ext2_sb_info through ext2_update_dynamic_rev() against concurrent ext2_sync_fs() or ext2_remount(). ext2_fill_super() and ext2_put_super() can be left out because you need a valid filesystem reference in all three cases, which you do not have when you are one of these functions. If the BKL is only protecting the modification of the ext2_sb_info it can safely be removed since this is protected by the struct ext2_sb_info s_lock. Signed-off-by: Jan Blunck <jblunck@suse.de> Cc: Jan Kara <jack@suse.cz> Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/ext2/super.c')
-rw-r--r--fs/ext2/super.c13
1 files changed, 0 insertions, 13 deletions
diff --git a/fs/ext2/super.c b/fs/ext2/super.c
index 28f65609589..71e9eb1fa69 100644
--- a/fs/ext2/super.c
+++ b/fs/ext2/super.c
@@ -26,7 +26,6 @@
#include <linux/random.h>
#include <linux/buffer_head.h>
#include <linux/exportfs.h>
-#include <linux/smp_lock.h>
#include <linux/vfs.h>
#include <linux/seq_file.h>
#include <linux/mount.h>
@@ -120,8 +119,6 @@ static void ext2_put_super (struct super_block * sb)
int i;
struct ext2_sb_info *sbi = EXT2_SB(sb);
- lock_kernel();
-
if (sb->s_dirt)
ext2_write_super(sb);
@@ -147,8 +144,6 @@ static void ext2_put_super (struct super_block * sb)
sb->s_fs_info = NULL;
kfree(sbi->s_blockgroup_lock);
kfree(sbi);
-
- unlock_kernel();
}
static struct kmem_cache * ext2_inode_cachep;
@@ -1170,7 +1165,6 @@ static int ext2_sync_fs(struct super_block *sb, int wait)
struct ext2_sb_info *sbi = EXT2_SB(sb);
struct ext2_super_block *es = EXT2_SB(sb)->s_es;
- lock_kernel();
spin_lock(&sbi->s_lock);
if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) {
ext2_debug("setting valid to 0\n");
@@ -1178,8 +1172,6 @@ static int ext2_sync_fs(struct super_block *sb, int wait)
}
spin_unlock(&sbi->s_lock);
ext2_sync_super(sb, es, wait);
- unlock_kernel();
-
return 0;
}
@@ -1201,7 +1193,6 @@ static int ext2_remount (struct super_block * sb, int * flags, char * data)
unsigned long old_sb_flags;
int err;
- lock_kernel();
spin_lock(&sbi->s_lock);
/* Store the old options */
@@ -1242,14 +1233,12 @@ static int ext2_remount (struct super_block * sb, int * flags, char * data)
}
if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) {
spin_unlock(&sbi->s_lock);
- unlock_kernel();
return 0;
}
if (*flags & MS_RDONLY) {
if (le16_to_cpu(es->s_state) & EXT2_VALID_FS ||
!(sbi->s_mount_state & EXT2_VALID_FS)) {
spin_unlock(&sbi->s_lock);
- unlock_kernel();
return 0;
}
/*
@@ -1282,7 +1271,6 @@ static int ext2_remount (struct super_block * sb, int * flags, char * data)
spin_unlock(&sbi->s_lock);
ext2_write_super(sb);
}
- unlock_kernel();
return 0;
restore_opts:
sbi->s_mount_opt = old_opts.s_mount_opt;
@@ -1290,7 +1278,6 @@ restore_opts:
sbi->s_resgid = old_opts.s_resgid;
sb->s_flags = old_sb_flags;
spin_unlock(&sbi->s_lock);
- unlock_kernel();
return err;
}