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authorSerge E. Hallyn <serue@us.ibm.com>2009-04-06 19:01:07 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-07 08:31:09 -0700
commit909e6d94795654040ed416ac69858d5d2ce66dd3 (patch)
treec0d873c341e3419c3bb54cffd964bbe850bbb4ab
parent7ce5ba3c7ef26284f60babbe4465259d1f9968f3 (diff)
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namespaces: move proc_net_get_sb to a generic fs/super.c helper
The mqueuefs filesystem will use this helper as well. Proc's main get_sb could also be made to use it, but that will require a bit more rework. Signed-off-by: Serge E. Hallyn <serue@us.ibm.com> Cc: Cedric Le Goater <clg@fr.ibm.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: "David S. Miller" <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/super.c40
-rw-r--r--include/linux/fs.h3
2 files changed, 43 insertions, 0 deletions
diff --git a/fs/super.c b/fs/super.c
index 77cb4ec919b..786fe7d7279 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -771,6 +771,46 @@ void kill_litter_super(struct super_block *sb)
EXPORT_SYMBOL(kill_litter_super);
+static int ns_test_super(struct super_block *sb, void *data)
+{
+ return sb->s_fs_info == data;
+}
+
+static int ns_set_super(struct super_block *sb, void *data)
+{
+ sb->s_fs_info = data;
+ return set_anon_super(sb, NULL);
+}
+
+int get_sb_ns(struct file_system_type *fs_type, int flags, void *data,
+ int (*fill_super)(struct super_block *, void *, int),
+ struct vfsmount *mnt)
+{
+ struct super_block *sb;
+
+ sb = sget(fs_type, ns_test_super, ns_set_super, data);
+ if (IS_ERR(sb))
+ return PTR_ERR(sb);
+
+ if (!sb->s_root) {
+ int err;
+ sb->s_flags = flags;
+ err = fill_super(sb, data, flags & MS_SILENT ? 1 : 0);
+ if (err) {
+ up_write(&sb->s_umount);
+ deactivate_super(sb);
+ return err;
+ }
+
+ sb->s_flags |= MS_ACTIVE;
+ }
+
+ simple_set_mnt(mnt, sb);
+ return 0;
+}
+
+EXPORT_SYMBOL(get_sb_ns);
+
#ifdef CONFIG_BLOCK
static int set_bdev_super(struct super_block *s, void *data)
{
diff --git a/include/linux/fs.h b/include/linux/fs.h
index bce40a2207e..562d2855cf3 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1699,6 +1699,9 @@ struct file_system_type {
struct lock_class_key i_alloc_sem_key;
};
+extern int get_sb_ns(struct file_system_type *fs_type, int flags, void *data,
+ int (*fill_super)(struct super_block *, void *, int),
+ struct vfsmount *mnt);
extern int get_sb_bdev(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data,
int (*fill_super)(struct super_block *, void *, int),