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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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33
fs/quota/quota.c
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@@ -18,7 +18,6 @@
#include <linux/quotaops.h>
#include <linux/types.h>
#include <linux/writeback.h>
#include "../internal.h"
static int check_quotactl_permission(struct super_block *sb, int type, int cmd,
qid_t id)
@@ -46,36 +45,22 @@ static int check_quotactl_permission(struct super_block *sb, int type, int cmd,
return security_quotactl(cmd, type, id, sb);
}
static void quota_sync_one(struct super_block *sb, void *arg)
{
if (sb->s_qcop && sb->s_qcop->quota_sync)
sb->s_qcop->quota_sync(sb, *(int *)arg, 1);
}
static int quota_sync_all(int type)
{
struct super_block *sb, *n;
int ret;
if (type >= MAXQUOTAS)
return -EINVAL;
ret = security_quotactl(Q_SYNC, type, 0, NULL);
if (ret)
return ret;
spin_lock(&sb_lock);
list_for_each_entry_safe(sb, n, &super_blocks, s_list) {
if (list_empty(&sb->s_instances))
continue;
if (!sb->s_qcop || !sb->s_qcop->quota_sync)
continue;
sb->s_count++;
spin_unlock(&sb_lock);
down_read(&sb->s_umount);
if (sb->s_root)
sb->s_qcop->quota_sync(sb, type, 1);
up_read(&sb->s_umount);
spin_lock(&sb_lock);
__put_super(sb);
}
spin_unlock(&sb_lock);
return 0;
if (!ret)
iterate_supers(quota_sync_one, &type);
return ret;
}
static int quota_quotaon(struct super_block *sb, int type, int cmd, qid_t id,