[AF_RXRPC]: Make the in-kernel AFS filesystem use AF_RXRPC.

[powerpc.git] / fs / afs / mntpt.c

diff --git a/fs/afs/mntpt.c b/fs/afs/mntpt.c
index ca3fa81..08c11a0 100644 (file)
--- a/fs/afs/mntpt.c
+++ b/fs/afs/mntpt.c
@@ -18,10 +18,6 @@
 #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"
 
 
@@ -30,6 +26,7 @@ static struct dentry *afs_mntpt_lookup(struct inode *dir,
                                       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,
@@ -43,16 +40,9 @@ const struct inode_operations afs_mntpt_inode_operations = {
 };
 
 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);
-
-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;
+unsigned long afs_mntpt_expiry_timeout = 10 * 60;
 
 /*
  * check a symbolic link to see whether it actually encodes a mountpoint
@@ -84,7 +74,7 @@ int afs_mntpt_check_symlink(struct afs_vnode *vnode)
 
        /* 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] == '#') &&
@@ -92,7 +82,7 @@ int afs_mntpt_check_symlink(struct afs_vnode *vnode)
            ) {
                _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);
        }
 
@@ -113,7 +103,7 @@ static struct dentry *afs_mntpt_lookup(struct inode *dir,
                                       struct dentry *dentry,
                                       struct nameidata *nd)
 {
-       kenter("%p,%p{%p{%s},%s}",
+       _enter("%p,%p{%p{%s},%s}",
               dir,
               dentry,
               dentry->d_parent,
@@ -129,7 +119,7 @@ static struct dentry *afs_mntpt_lookup(struct inode *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 ?
@@ -152,7 +142,7 @@ static struct vfsmount *afs_mntpt_do_automount(struct dentry *mntpt)
        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);
 
@@ -196,13 +186,13 @@ static struct vfsmount *afs_mntpt_do_automount(struct dentry *mntpt)
                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:
@@ -212,7 +202,7 @@ error:
                free_page((unsigned long) devname);
        if (options)
                free_page((unsigned long) options);
-       kleave(" = %d", ret);
+       _leave(" = %d", ret);
        return ERR_PTR(ret);
 }
 
@@ -222,51 +212,81 @@ error:
 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:
+               path_release(nd);
                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);
 }
 
 /*
  * 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("");
+
+       if (!list_empty(&afs_vfsmounts)) {
+               mark_mounts_for_expiry(&afs_vfsmounts);
+               schedule_delayed_work(&afs_mntpt_expiry_timer,
+                                     afs_mntpt_expiry_timeout * HZ);
+       }
+
+       _leave("");
+}
 
-       mark_mounts_for_expiry(&afs_vfsmounts);
+/*
+ * kill the AFS mountpoint timer if it's still running
+ */
+void afs_mntpt_kill_timer(void)
+{
+       _enter("");
 
-       afs_kafstimod_add_timer(&afs_mntpt_expiry_timer,
-                               afs_mntpt_expiry_timeout * HZ);
+       ASSERT(list_empty(&afs_vfsmounts));
+       cancel_delayed_work(&afs_mntpt_expiry_timer);
+       flush_scheduled_work();
+}
 
-       kleave("");
+/*
+ * 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);
 }