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authorAl Viro <viro@zeniv.linux.org.uk>2011-06-03 20:16:57 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2011-07-20 01:43:04 -0400
commit43e15cdbefea4ce6d68113de98d4f61c0cf45687 (patch)
tree75676aae179fc56bbb9d861c0ab656a9edaa7ca4 /fs
parent44396f4b5cb8566f7118aec55eeac99be7ad94cb (diff)
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 <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs')
-rw-r--r--fs/super.c36
1 files changed, 36 insertions, 0 deletions
diff --git a/fs/super.c b/fs/super.c
index ab3d672db0de..444da9579068 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -452,6 +452,42 @@ void iterate_supers(void (*f)(struct super_block *, void *), void *arg)
452} 452}
453 453
454/** 454/**
455 * iterate_supers_type - call function for superblocks of given type
456 * @type: fs type
457 * @f: function to call
458 * @arg: argument to pass to it
459 *
460 * Scans the superblock list and calls given function, passing it
461 * locked superblock and given argument.
462 */
463void iterate_supers_type(struct file_system_type *type,
464 void (*f)(struct super_block *, void *), void *arg)
465{
466 struct super_block *sb, *p = NULL;
467
468 spin_lock(&sb_lock);
469 list_for_each_entry(sb, &type->fs_supers, s_instances) {
470 sb->s_count++;
471 spin_unlock(&sb_lock);
472
473 down_read(&sb->s_umount);
474 if (sb->s_root)
475 f(sb, arg);
476 up_read(&sb->s_umount);
477
478 spin_lock(&sb_lock);
479 if (p)
480 __put_super(p);
481 p = sb;
482 }
483 if (p)
484 __put_super(p);
485 spin_unlock(&sb_lock);
486}
487
488EXPORT_SYMBOL(iterate_supers_type);
489
490/**
455 * get_super - get the superblock of a device 491 * get_super - get the superblock of a device
456 * @bdev: device to get the superblock for 492 * @bdev: device to get the superblock for
457 * 493 *