From 43e15cdbefea4ce6d68113de98d4f61c0cf45687 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Fri, 3 Jun 2011 20:16:57 -0400 Subject: new helper: iterate_supers_type() Call the given function for all superblocks of given type. Function gets a superblock (with s_umount locked shared) and (void *) argument supplied by caller of iterator. Signed-off-by: Al Viro --- fs/super.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) (limited to 'fs/super.c') diff --git a/fs/super.c b/fs/super.c index ab3d672db0de..444da9579068 100644 --- a/fs/super.c +++ b/fs/super.c @@ -451,6 +451,42 @@ void iterate_supers(void (*f)(struct super_block *, void *), void *arg) spin_unlock(&sb_lock); } +/** + * iterate_supers_type - call function for superblocks of given type + * @type: fs type + * @f: function to call + * @arg: argument to pass to it + * + * Scans the superblock list and calls given function, passing it + * locked superblock and given argument. + */ +void iterate_supers_type(struct file_system_type *type, + void (*f)(struct super_block *, void *), void *arg) +{ + struct super_block *sb, *p = NULL; + + spin_lock(&sb_lock); + list_for_each_entry(sb, &type->fs_supers, s_instances) { + sb->s_count++; + spin_unlock(&sb_lock); + + down_read(&sb->s_umount); + if (sb->s_root) + f(sb, arg); + up_read(&sb->s_umount); + + spin_lock(&sb_lock); + if (p) + __put_super(p); + p = sb; + } + if (p) + __put_super(p); + spin_unlock(&sb_lock); +} + +EXPORT_SYMBOL(iterate_supers_type); + /** * get_super - get the superblock of a device * @bdev: device to get the superblock for -- cgit v1.2.3-59-g8ed1b