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authorDavid Howells <dhowells@redhat.com>2011-01-14 22:10:03 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2011-01-16 04:07:48 +0300
commitea5b778a8b98c85a87d66bf844904f9c3802b869 (patch)
treebaa56cbe1a907d76341f2cad53e16569cc1d3288 /fs/cifs/cifs_dfs_ref.c
parentab90911ff90cdab59b31c045c3f0ae480d14f29d (diff)
downloadlinux-ea5b778a8b98c85a87d66bf844904f9c3802b869.tar.xz
Unexport do_add_mount() and add in follow_automount(), not ->d_automount()
Unexport do_add_mount() and make ->d_automount() return the vfsmount to be added rather than calling do_add_mount() itself. follow_automount() will then do the addition. This slightly complicates things as ->d_automount() normally wants to add the new vfsmount to an expiration list and start an expiration timer. The problem with that is that the vfsmount will be deleted if it has a refcount of 1 and the timer will not repeat if the expiration list is empty. To this end, we require the vfsmount to be returned from d_automount() with a refcount of (at least) 2. One of these refs will be dropped unconditionally. In addition, follow_automount() must get a 3rd ref around the call to do_add_mount() lest it eat a ref and return an error, leaving the mount we have open to being expired as we would otherwise have only 1 ref on it. d_automount() should also add the the vfsmount to the expiration list (by calling mnt_set_expiry()) and start the expiration timer before returning, if this mechanism is to be used. The vfsmount will be unlinked from the expiration list by follow_automount() if do_add_mount() fails. This patch also fixes the call to do_add_mount() for AFS to propagate the mount flags from the parent vfsmount. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/cifs/cifs_dfs_ref.c')
-rw-r--r--fs/cifs/cifs_dfs_ref.c26
1 files changed, 6 insertions, 20 deletions
diff --git a/fs/cifs/cifs_dfs_ref.c b/fs/cifs/cifs_dfs_ref.c
index 0fc163808de3..7ed36536e754 100644
--- a/fs/cifs/cifs_dfs_ref.c
+++ b/fs/cifs/cifs_dfs_ref.c
@@ -351,7 +351,6 @@ free_xid:
struct vfsmount *cifs_dfs_d_automount(struct path *path)
{
struct vfsmount *newmnt;
- int err;
cFYI(1, "in %s", __func__);
@@ -361,25 +360,12 @@ struct vfsmount *cifs_dfs_d_automount(struct path *path)
return newmnt;
}
- mntget(newmnt);
- err = do_add_mount(newmnt, path, path->mnt->mnt_flags | MNT_SHRINKABLE,
- &cifs_dfs_automount_list);
- switch (err) {
- case 0:
- schedule_delayed_work(&cifs_dfs_automount_task,
- cifs_dfs_mountpoint_expiry_timeout);
- cFYI(1, "leaving %s [ok]" , __func__);
- return newmnt;
- case -EBUSY:
- /* someone else made a mount here whilst we were busy */
- mntput(newmnt);
- cFYI(1, "leaving %s [EBUSY]" , __func__);
- return NULL;
- default:
- mntput(newmnt);
- cFYI(1, "leaving %s [error %d]" , __func__, err);
- return ERR_PTR(err);
- }
+ mntget(newmnt); /* prevent immediate expiration */
+ mnt_set_expiry(newmnt, &cifs_dfs_automount_list);
+ schedule_delayed_work(&cifs_dfs_automount_task,
+ cifs_dfs_mountpoint_expiry_timeout);
+ cFYI(1, "leaving %s [ok]" , __func__);
+ return newmnt;
}
const struct inode_operations cifs_dfs_referral_inode_operations = {