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authorJan Blunck <jblunck@infradead.org>2010-08-15 22:51:10 +0200
committerArnd Bergmann <arnd@arndb.de>2010-10-04 21:10:10 +0200
commitdb71922217a214e5c9268448e537b54fc1f301ea (patch)
tree9c9afbf29411547891f6968e5ade29ce59d66c07 /fs/ntfs
parent899611ee7d373e5eeda08e9a8632684e1ebbbf00 (diff)
downloadvexpress-lsk-db71922217a214e5c9268448e537b54fc1f301ea.tar.gz
BKL: Explicitly add BKL around get_sb/fill_super
This patch is a preparation necessary to remove the BKL from do_new_mount(). It explicitly adds calls to lock_kernel()/unlock_kernel() around get_sb/fill_super operations for filesystems that still uses the BKL. I've read through all the code formerly covered by the BKL inside do_kern_mount() and have satisfied myself that it doesn't need the BKL any more. do_kern_mount() is already called without the BKL when mounting the rootfs and in nfsctl. do_kern_mount() calls vfs_kern_mount(), which is called from various places without BKL: simple_pin_fs(), nfs_do_clone_mount() through nfs_follow_mountpoint(), afs_mntpt_do_automount() through afs_mntpt_follow_link(). Both later functions are actually the filesystems follow_link inode operation. vfs_kern_mount() is calling the specified get_sb function and lets the filesystem do its job by calling the given fill_super function. Therefore I think it is safe to push down the BKL from the VFS to the low-level filesystems get_sb/fill_super operation. [arnd: do not add the BKL to those file systems that already don't use it elsewhere] Signed-off-by: Jan Blunck <jblunck@infradead.org> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Matthew Wilcox <matthew@wil.cx> Cc: Christoph Hellwig <hch@infradead.org>
Diffstat (limited to 'fs/ntfs')
-rw-r--r--fs/ntfs/super.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/ntfs/super.c b/fs/ntfs/super.c
index 512806171bf..1f31e77fc41 100644
--- a/fs/ntfs/super.c
+++ b/fs/ntfs/super.c
@@ -2732,6 +2732,8 @@ static int ntfs_fill_super(struct super_block *sb, void *opt, const int silent)
struct inode *tmp_ino;
int blocksize, result;
+ lock_kernel();
+
/*
* We do a pretty difficult piece of bootstrap by reading the
* MFT (and other metadata) from disk into memory. We'll only
@@ -2755,6 +2757,7 @@ static int ntfs_fill_super(struct super_block *sb, void *opt, const int silent)
ntfs_error(sb, "Allocation of NTFS volume structure "
"failed. Aborting mount...");
lockdep_on();
+ unlock_kernel();
return -ENOMEM;
}
/* Initialize ntfs_volume structure. */
@@ -2942,6 +2945,7 @@ static int ntfs_fill_super(struct super_block *sb, void *opt, const int silent)
sb->s_export_op = &ntfs_export_ops;
lock_kernel();
lockdep_on();
+ unlock_kernel();
return 0;
}
ntfs_error(sb, "Failed to allocate root directory.");
@@ -3062,6 +3066,7 @@ err_out_now:
kfree(vol);
ntfs_debug("Failed, returning -EINVAL.");
lockdep_on();
+ unlock_kernel();
return -EINVAL;
}