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NFS: Add timeout to submounts

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Make automounted partitions expire using the mark_mounts_for_expiry()
function. The timeout is controlled via a sysctl.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust
2006-06-09 09:34:20 -04:00
parent 55a975937d
commit 51d8fa6a10
4 changed files with 40 additions and 1 deletions
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25
fs/nfs/namespace.c
View File

@@ -18,6 +18,11 @@
#define NFSDBG_FACILITY NFSDBG_VFS
LIST_HEAD(nfs_automount_list);
static void nfs_expire_automounts(void *list);
static DECLARE_WORK(nfs_automount_task, nfs_expire_automounts, &nfs_automount_list);
int nfs_mountpoint_expiry_timeout = 500 * HZ;
/*
* nfs_follow_mountpoint - handle crossing a mountpoint on the server
* @dentry - dentry of mountpoint
@@ -59,7 +64,7 @@ static void * nfs_follow_mountpoint(struct dentry *dentry, struct nameidata *nd)
goto out_err;
mntget(mnt);
err = do_add_mount(mnt, nd, nd->mnt->mnt_flags, NULL);
err = do_add_mount(mnt, nd, nd->mnt->mnt_flags|MNT_SHRINKABLE, &nfs_automount_list);
if (err < 0) {
mntput(mnt);
if (err == -EBUSY)
@@ -70,6 +75,7 @@ static void * nfs_follow_mountpoint(struct dentry *dentry, struct nameidata *nd)
dput(nd->dentry);
nd->mnt = mnt;
nd->dentry = dget(mnt->mnt_root);
schedule_delayed_work(&nfs_automount_task, nfs_mountpoint_expiry_timeout);
out:
dprintk("%s: done, returned %d\n", __FUNCTION__, err);
return ERR_PTR(err);
@@ -87,3 +93,20 @@ struct inode_operations nfs_mountpoint_inode_operations = {
.follow_link = nfs_follow_mountpoint,
.getattr = nfs_getattr,
};
static void nfs_expire_automounts(void *data)
{
struct list_head *list = (struct list_head *)data;
mark_mounts_for_expiry(list);
if (!list_empty(list))
schedule_delayed_work(&nfs_automount_task, nfs_mountpoint_expiry_timeout);
}
void nfs_release_automount_timer(void)
{
if (list_empty(&nfs_automount_list)) {
cancel_delayed_work(&nfs_automount_task);
flush_scheduled_work();
}
}