Patch from Maneesh Soni <maneesh@in.ibm.com>
The following patch should enable smalldevfs to work with dcache_rcu. The
locking problem is because smalldevfs is written keeping fastwalk
in mind where as dcache_rcu backs out fastwalk code to 2.5.10 level.
devfs/base.c | 13 +++++--------
1 files changed, 5 insertions(+), 8 deletions(-)
diff -puN fs/devfs/base.c~smalldevfs-dcache_rcu-fix fs/devfs/base.c
--- 25/fs/devfs/base.c~smalldevfs-dcache_rcu-fix 2003-02-20 01:15:23.000000000 -0800
+++ 25-akpm/fs/devfs/base.c 2003-02-20 01:15:23.000000000 -0800
@@ -60,8 +60,7 @@ static int walk_parents_mkdir(const char
memcpy(buf, *path, len);
buf[len] = '\0';
- spin_lock(&dcache_lock);
- err = link_path_walk(buf, nd); /* releases dcache_lock */
+ err = link_path_walk(buf, nd);
if (err)
return err;
@@ -101,14 +100,13 @@ static int devfs_decode(devfs_handle_t d
memset(&nd, 0, sizeof(nd));
nd.flags = LOOKUP_PARENT;
- nd.mnt = devfs_vfsmount;
- nd.dentry = dir;
+ nd.mnt = mntget(devfs_vfsmount);
+ nd.dentry = dget(dir);
err = walk_parents_mkdir(&name, &nd, is_dir);
if (err)
return err;
- spin_lock(&dcache_lock);
err = link_path_walk(name, &nd);
if (err)
return err;
@@ -247,10 +245,9 @@ void devfs_remove(const char *fmt, ...)
buf[sizeof(buf)-1] = '\0';
memset(&nd, 0, sizeof(nd));
- nd.mnt = devfs_vfsmount;
- nd.dentry = devfs_vfsmount->mnt_sb->s_root;
+ nd.mnt = mntget(devfs_vfsmount);
+ nd.dentry = dget(devfs_vfsmount->mnt_sb->s_root);
- spin_lock(&dcache_lock);
err = link_path_walk(buf, &nd);
if (!err) {
devfs_unregister(nd.dentry);
_