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new helper: iterate_supers()

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

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2010-03-23 06:06:58 -04:00
parent 35cf7ba0b4
commit 01a05b337a
6 changed files with 57 additions and 83 deletions
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fs/sync.c
+6 -19
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@@ -77,31 +77,18 @@ int sync_filesystem(struct super_block *sb)
}
EXPORT_SYMBOL_GPL(sync_filesystem);
static void sync_one_sb(struct super_block *sb, void *arg)
{
if (!(sb->s_flags & MS_RDONLY) && sb->s_bdi)
__sync_filesystem(sb, *(int *)arg);
}
/*
* Sync all the data for all the filesystems (called by sys_sync() and
* emergency sync)
*/
static void sync_filesystems(int wait)
{
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_flags & MS_RDONLY) && sb->s_root && sb->s_bdi)
__sync_filesystem(sb, wait);
up_read(&sb->s_umount);
/* restart only when sb is no longer on the list */
spin_lock(&sb_lock);
__put_super(sb);
}
spin_unlock(&sb_lock);
iterate_supers(sync_one_sb, &wait);
}
/*