Re: [PATCH 01/27] BKL: Push down BKL from do_new_mount() to the filesystems get_sb/fill_super operation

From: Jan Blunck
Date: Mon Nov 02 2009 - 12:12:06 EST

On Mon, Nov 02, Jan Blunck wrote:

> 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.
> Signed-off-by: Jan Blunck <jblunck@xxxxxxx>
> Cc: Matthew Wilcox <matthew@xxxxxx>

Attached is a new version of the patch that includes the changes for
filesystems outside of fs/ directory as well. Besides that I trimmed the CC
list this time.