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new helper: iterate_supers()

Browse source 
... and switch the simple "loop over superblocks and do something"
loops to it.

Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Al Viro 2010-03-23 06:06:58 -04:00
commit 01a05b337a
6 changed files with 56 additions and 82 deletions
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30
fs/super.c
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@ -391,6 +391,36 @@ void sync_supers(void)
spin_unlock(&sb_lock);
}
/**
* iterate_supers - call function for all active superblocks
* @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(void (*f)(struct super_block *, void *), void *arg)
{
struct super_block *sb, *n;
spin_lock(&sb_lock);
list_for_each_entry_safe(sb, n, &super_blocks, s_list) {
if (list_empty(&sb->s_instances))
continue;
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);
__put_super(sb);
}
spin_unlock(&sb_lock);
}
/**
* get_super - get the superblock of a device
* @bdev: device to get the superblock for