-/* mntpt.c: mountpoint management
+/* mountpoint management
*
* Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
-#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
#include <linux/mount.h>
#include <linux/namei.h>
#include <linux/mnt_namespace.h>
-#include "super.h"
-#include "cell.h"
-#include "volume.h"
-#include "vnode.h"
#include "internal.h"
struct nameidata *nd);
static int afs_mntpt_open(struct inode *inode, struct file *file);
static void *afs_mntpt_follow_link(struct dentry *dentry, struct nameidata *nd);
+static void afs_mntpt_expiry_timed_out(struct work_struct *work);
const struct file_operations afs_mntpt_file_operations = {
.open = afs_mntpt_open,
};
-struct inode_operations afs_mntpt_inode_operations = {
+const struct inode_operations afs_mntpt_inode_operations = {
.lookup = afs_mntpt_lookup,
.follow_link = afs_mntpt_follow_link,
.readlink = page_readlink,
};
static LIST_HEAD(afs_vfsmounts);
+static DECLARE_DELAYED_WORK(afs_mntpt_expiry_timer, afs_mntpt_expiry_timed_out);
-static void afs_mntpt_expiry_timed_out(struct afs_timer *timer);
+unsigned long afs_mntpt_expiry_timeout = 10 * 60;
-struct afs_timer_ops afs_mntpt_expiry_timer_ops = {
- .timed_out = afs_mntpt_expiry_timed_out,
-};
-
-struct afs_timer afs_mntpt_expiry_timer;
-
-unsigned long afs_mntpt_expiry_timeout = 20;
-
-/*****************************************************************************/
/*
* check a symbolic link to see whether it actually encodes a mountpoint
* - sets the AFS_VNODE_MOUNTPOINT flag on the vnode appropriately
*/
-int afs_mntpt_check_symlink(struct afs_vnode *vnode)
+int afs_mntpt_check_symlink(struct afs_vnode *vnode, struct key *key)
{
+ struct file file = {
+ .private_data = key,
+ };
struct page *page;
size_t size;
char *buf;
_enter("{%u,%u}", vnode->fid.vnode, vnode->fid.unique);
/* read the contents of the symlink into the pagecache */
- page = read_mapping_page(AFS_VNODE_TO_I(vnode)->i_mapping, 0, NULL);
+ page = read_mapping_page(AFS_VNODE_TO_I(vnode)->i_mapping, 0, &file);
if (IS_ERR(page)) {
ret = PTR_ERR(page);
goto out;
}
ret = -EIO;
- wait_on_page_locked(page);
- buf = kmap(page);
- if (!PageUptodate(page))
- goto out_free;
if (PageError(page))
goto out_free;
+ buf = kmap(page);
+
/* examine the symlink's contents */
size = vnode->status.size;
- _debug("symlink to %*.*s", size, (int) size, buf);
+ _debug("symlink to %*.*s", (int) size, (int) size, buf);
if (size > 2 &&
(buf[0] == '%' || buf[0] == '#') &&
) {
_debug("symlink is a mountpoint");
spin_lock(&vnode->lock);
- vnode->flags |= AFS_VNODE_MOUNTPOINT;
+ set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
spin_unlock(&vnode->lock);
}
ret = 0;
- out_free:
kunmap(page);
+out_free:
page_cache_release(page);
- out:
+out:
_leave(" = %d", ret);
return ret;
+}
-} /* end afs_mntpt_check_symlink() */
-
-/*****************************************************************************/
/*
* no valid lookup procedure on this sort of dir
*/
struct dentry *dentry,
struct nameidata *nd)
{
- kenter("%p,%p{%p{%s},%s}",
+ _enter("%p,%p{%p{%s},%s}",
dir,
dentry,
dentry->d_parent,
dentry->d_name.name);
return ERR_PTR(-EREMOTE);
-} /* end afs_mntpt_lookup() */
+}
-/*****************************************************************************/
/*
* no valid open procedure on this sort of dir
*/
static int afs_mntpt_open(struct inode *inode, struct file *file)
{
- kenter("%p,%p{%p{%s},%s}",
+ _enter("%p,%p{%p{%s},%s}",
inode, file,
file->f_path.dentry->d_parent,
file->f_path.dentry->d_parent ?
file->f_path.dentry->d_name.name);
return -EREMOTE;
-} /* end afs_mntpt_open() */
+}
-/*****************************************************************************/
/*
* create a vfsmount to be automounted
*/
char *buf, *devname = NULL, *options = NULL;
int ret;
- kenter("{%s}", mntpt->d_name.name);
+ _enter("{%s}", mntpt->d_name.name);
BUG_ON(!mntpt->d_inode);
}
ret = -EIO;
- wait_on_page_locked(page);
- if (!PageUptodate(page) || PageError(page))
+ if (PageError(page))
goto error;
buf = kmap(page);
strcat(options, ",rwpath");
/* try and do the mount */
- kdebug("--- attempting mount %s -o %s ---", devname, options);
+ _debug("--- attempting mount %s -o %s ---", devname, options);
mnt = vfs_kern_mount(&afs_fs_type, 0, devname, options);
- kdebug("--- mount result %p ---", mnt);
+ _debug("--- mount result %p ---", mnt);
free_page((unsigned long) devname);
free_page((unsigned long) options);
- kleave(" = %p", mnt);
+ _leave(" = %p", mnt);
return mnt;
- error:
+error:
if (page)
page_cache_release(page);
if (devname)
free_page((unsigned long) devname);
if (options)
free_page((unsigned long) options);
- kleave(" = %d", ret);
+ _leave(" = %d", ret);
return ERR_PTR(ret);
-} /* end afs_mntpt_do_automount() */
+}
-/*****************************************************************************/
/*
* follow a link from a mountpoint directory, thus causing it to be mounted
*/
static void *afs_mntpt_follow_link(struct dentry *dentry, struct nameidata *nd)
{
struct vfsmount *newmnt;
- struct dentry *old_dentry;
int err;
- kenter("%p{%s},{%s:%p{%s}}",
+ _enter("%p{%s},{%s:%p{%s},}",
dentry,
dentry->d_name.name,
nd->mnt->mnt_devname,
dentry,
nd->dentry->d_name.name);
- newmnt = afs_mntpt_do_automount(dentry);
+ dput(nd->dentry);
+ nd->dentry = dget(dentry);
+
+ newmnt = afs_mntpt_do_automount(nd->dentry);
if (IS_ERR(newmnt)) {
path_release(nd);
return (void *)newmnt;
}
- old_dentry = nd->dentry;
- nd->dentry = dentry;
- err = do_add_mount(newmnt, nd, 0, &afs_vfsmounts);
- nd->dentry = old_dentry;
-
- path_release(nd);
-
- if (!err) {
- mntget(newmnt);
+ mntget(newmnt);
+ err = do_add_mount(newmnt, nd, MNT_SHRINKABLE, &afs_vfsmounts);
+ switch (err) {
+ case 0:
+ mntput(nd->mnt);
+ dput(nd->dentry);
nd->mnt = newmnt;
- dget(newmnt->mnt_root);
- nd->dentry = newmnt->mnt_root;
+ nd->dentry = dget(newmnt->mnt_root);
+ schedule_delayed_work(&afs_mntpt_expiry_timer,
+ afs_mntpt_expiry_timeout * HZ);
+ break;
+ case -EBUSY:
+ /* someone else made a mount here whilst we were busy */
+ while (d_mountpoint(nd->dentry) &&
+ follow_down(&nd->mnt, &nd->dentry))
+ ;
+ err = 0;
+ default:
+ mntput(newmnt);
+ break;
}
- kleave(" = %d", err);
+ _leave(" = %d", err);
return ERR_PTR(err);
-} /* end afs_mntpt_follow_link() */
+}
-/*****************************************************************************/
/*
* handle mountpoint expiry timer going off
*/
-static void afs_mntpt_expiry_timed_out(struct afs_timer *timer)
+static void afs_mntpt_expiry_timed_out(struct work_struct *work)
{
- kenter("");
+ _enter("");
- mark_mounts_for_expiry(&afs_vfsmounts);
+ if (!list_empty(&afs_vfsmounts)) {
+ mark_mounts_for_expiry(&afs_vfsmounts);
+ schedule_delayed_work(&afs_mntpt_expiry_timer,
+ afs_mntpt_expiry_timeout * HZ);
+ }
- afs_kafstimod_add_timer(&afs_mntpt_expiry_timer,
- afs_mntpt_expiry_timeout * HZ);
+ _leave("");
+}
- kleave("");
-} /* end afs_mntpt_expiry_timed_out() */
+/*
+ * kill the AFS mountpoint timer if it's still running
+ */
+void afs_mntpt_kill_timer(void)
+{
+ _enter("");
+
+ ASSERT(list_empty(&afs_vfsmounts));
+ cancel_delayed_work(&afs_mntpt_expiry_timer);
+ flush_scheduled_work();
+}
+
+/*
+ * begin unmount by attempting to remove all automounted mountpoints we added
+ */
+void afs_umount_begin(struct vfsmount *vfsmnt, int flags)
+{
+ shrink_submounts(vfsmnt, &afs_vfsmounts);
+}
git.openpandora.org / pandora-kernel.git / blobdiff