1. 15 Jan, 2011 13 commits
    • Ian Kent's avatar
      autofs4: Clean up dentry operations · 71e469db
      Ian Kent authored
      
      
      There are now two distinct dentry operations uses. One for dentrys
      that trigger mounts and one for dentrys that do not.
      
      Rationalize the use of these dentry operations and rename them to
      reflect their function.
      
      Signed-off-by: default avatarIan Kent <raven@themaw.net>
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      71e469db
    • Ian Kent's avatar
      autofs4: Clean up inode operations · e61da20a
      Ian Kent authored
      
      
      Since the use of ->follow_link() has been eliminated there is no
      need to separate the indirect and direct inode operations.
      
      Signed-off-by: default avatarIan Kent <raven@themaw.net>
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      e61da20a
    • Ian Kent's avatar
      autofs4: Remove unused code · 8c13a676
      Ian Kent authored
      
      
      Remove code that is not used due to the use of ->d_automount()
      and ->d_manage().
      
      Signed-off-by: default avatarIan Kent <raven@themaw.net>
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      8c13a676
    • Ian Kent's avatar
      autofs4: Add d_manage() dentry operation · b5b80177
      Ian Kent authored
      
      
      This patch required a previous patch to add the ->d_automount()
      dentry operation.
      
      Add a function to use the newly defined ->d_manage() dentry operation
      for blocking during mount and expire.
      
      Whether the VFS calls the dentry operations d_automount() and d_manage()
      is controled by the DMANAGED_AUTOMOUNT and DMANAGED_TRANSIT flags. autofs
      uses the d_automount() operation to callback to user space to request
      mount operations and the d_manage() operation to block walks into mounts
      that are under construction or destruction.
      
      In order to prevent these functions from being called unnecessarily the
      DMANAGED_* flags are cleared for cases which would cause this. In the
      common case the DMANAGED_AUTOMOUNT and DMANAGED_TRANSIT flags are both
      set for dentrys waiting to be mounted. The DMANAGED_TRANSIT flag is
      cleared upon successful mount request completion and set during expire
      runs, both during the dentry expire check, and if selected for expire,
      is left set until a subsequent successful mount request completes.
      
      The exception to this is the so-called rootless multi-mount which has
      no actual mount at its base. In this case the DMANAGED_AUTOMOUNT flag
      is cleared upon successful mount request completion as well and set
      again after a successful expire.
      
      Signed-off-by: default avatarIan Kent <raven@themaw.net>
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      b5b80177
    • Ian Kent's avatar
      autofs4: Add d_automount() dentry operation · 10584211
      Ian Kent authored
      
      
      Add a function to use the newly defined ->d_automount() dentry operation
      for triggering mounts instead of doing the user space callback in ->lookup()
      and ->d_revalidate().
      
      Note, to be useful the subsequent patch to add the ->d_manage() dentry
      operation is also needed so the discussion of functionality is deferred to
      that patch.
      
      Signed-off-by: default avatarIan Kent <raven@themaw.net>
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      10584211
    • David Howells's avatar
      Remove the automount through follow_link() kludge code from pathwalk · db372915
      David Howells authored
      
      
      Remove the automount through follow_link() kludge code from pathwalk in favour
      of using d_automount().
      
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Acked-by: default avatarIan Kent <raven@themaw.net>
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      db372915
    • David Howells's avatar
      CIFS: Use d_automount() rather than abusing follow_link() · 01c64fea
      David Howells authored
      
      
      Make CIFS use the new d_automount() dentry operation rather than abusing
      follow_link() on directories.
      
      [NOTE: THIS IS UNTESTED!]
      
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Cc: Steve French <sfrench@samba.org>
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      01c64fea
    • David Howells's avatar
      NFS: Use d_automount() rather than abusing follow_link() · 36d43a43
      David Howells authored
      
      
      Make NFS use the new d_automount() dentry operation rather than abusing
      follow_link() on directories.
      
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Acked-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
      Acked-by: default avatarIan Kent <raven@themaw.net>
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      36d43a43
    • David Howells's avatar
      AFS: Use d_automount() rather than abusing follow_link() · d18610b0
      David Howells authored
      
      
      Make AFS use the new d_automount() dentry operation rather than abusing
      follow_link() on directories.
      
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      d18610b0
    • David Howells's avatar
      Add an AT_NO_AUTOMOUNT flag to suppress terminal automount · 6f45b656
      David Howells authored
      
      
      Add an AT_NO_AUTOMOUNT flag to suppress terminal automounting of automount
      point directories.  This can be used by fstatat() users to permit the
      gathering of attributes on an automount point and also prevent
      mass-automounting of a directory of automount points by ls.
      
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Acked-by: default avatarIan Kent <raven@themaw.net>
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      6f45b656
    • David Howells's avatar
      Add a dentry op to allow processes to be held during pathwalk transit · cc53ce53
      David Howells authored
      
      
      Add a dentry op (d_manage) to permit a filesystem to hold a process and make it
      sleep when it tries to transit away from one of that filesystem's directories
      during a pathwalk.  The operation is keyed off a new dentry flag
      (DCACHE_MANAGE_TRANSIT).
      
      The filesystem is allowed to be selective about which processes it holds and
      which it permits to continue on or prohibits from transiting from each flagged
      directory.  This will allow autofs to hold up client processes whilst letting
      its userspace daemon through to maintain the directory or the stuff behind it
      or mounted upon it.
      
      The ->d_manage() dentry operation:
      
      	int (*d_manage)(struct path *path, bool mounting_here);
      
      takes a pointer to the directory about to be transited away from and a flag
      indicating whether the transit is undertaken by do_add_mount() or
      do_move_mount() skipping through a pile of filesystems mounted on a mountpoint.
      
      It should return 0 if successful and to let the process continue on its way;
      -EISDIR to prohibit the caller from skipping to overmounted filesystems or
      automounting, and to use this directory; or some other error code to return to
      the user.
      
      ->d_manage() is called with namespace_sem writelocked if mounting_here is true
      and no other locks held, so it may sleep.  However, if mounting_here is true,
      it may not initiate or wait for a mount or unmount upon the parameter
      directory, even if the act is actually performed by userspace.
      
      Within fs/namei.c, follow_managed() is extended to check with d_manage() first
      on each managed directory, before transiting away from it or attempting to
      automount upon it.
      
      follow_down() is renamed follow_down_one() and should only be used where the
      filesystem deliberately intends to avoid management steps (e.g. autofs).
      
      A new follow_down() is added that incorporates the loop done by all other
      callers of follow_down() (do_add/move_mount(), autofs and NFSD; whilst AFS, NFS
      and CIFS do use it, their use is removed by converting them to use
      d_automount()).  The new follow_down() calls d_manage() as appropriate.  It
      also takes an extra parameter to indicate if it is being called from mount code
      (with namespace_sem writelocked) which it passes to d_manage().  follow_down()
      ignores automount points so that it can be used to mount on them.
      
      __follow_mount_rcu() is made to abort rcu-walk mode if it hits a directory with
      DCACHE_MANAGE_TRANSIT set on the basis that we're probably going to have to
      sleep.  It would be possible to enter d_manage() in rcu-walk mode too, and have
      that determine whether to abort or not itself.  That would allow the autofs
      daemon to continue on in rcu-walk mode.
      
      Note that DCACHE_MANAGE_TRANSIT on a directory should be cleared when it isn't
      required as every tranist from that directory will cause d_manage() to be
      invoked.  It can always be set again when necessary.
      
      ==========================
      WHAT THIS MEANS FOR AUTOFS
      ==========================
      
      Autofs currently uses the lookup() inode op and the d_revalidate() dentry op to
      trigger the automounting of indirect mounts, and both of these can be called
      with i_mutex held.
      
      autofs knows that the i_mutex will be held by the caller in lookup(), and so
      can drop it before invoking the daemon - but this isn't so for d_revalidate(),
      since the lock is only held on _some_ of the code paths that call it.  This
      means that autofs can't risk dropping i_mutex from its d_revalidate() function
      before it calls the daemon.
      
      The bug could manifest itself as, for example, a process that's trying to
      validate an automount dentry that gets made to wait because that dentry is
      expired and needs cleaning up:
      
      	mkdir         S ffffffff8014e05a     0 32580  24956
      	Call Trace:
      	 [<ffffffff885371fd>] :autofs4:autofs4_wait+0x674/0x897
      	 [<ffffffff80127f7d>] avc_has_perm+0x46/0x58
      	 [<ffffffff8009fdcf>] autoremove_wake_function+0x0/0x2e
      	 [<ffffffff88537be6>] :autofs4:autofs4_expire_wait+0x41/0x6b
      	 [<ffffffff88535cfc>] :autofs4:autofs4_revalidate+0x91/0x149
      	 [<ffffffff80036d96>] __lookup_hash+0xa0/0x12f
      	 [<ffffffff80057a2f>] lookup_create+0x46/0x80
      	 [<ffffffff800e6e31>] sys_mkdirat+0x56/0xe4
      
      versus the automount daemon which wants to remove that dentry, but can't
      because the normal process is holding the i_mutex lock:
      
      	automount     D ffffffff8014e05a     0 32581      1              32561
      	Call Trace:
      	 [<ffffffff80063c3f>] __mutex_lock_slowpath+0x60/0x9b
      	 [<ffffffff8000ccf1>] do_path_lookup+0x2ca/0x2f1
      	 [<ffffffff80063c89>] .text.lock.mutex+0xf/0x14
      	 [<ffffffff800e6d55>] do_rmdir+0x77/0xde
      	 [<ffffffff8005d229>] tracesys+0x71/0xe0
      	 [<ffffffff8005d28d>] tracesys+0xd5/0xe0
      
      which means that the system is deadlocked.
      
      This patch allows autofs to hold up normal processes whilst the daemon goes
      ahead and does things to the dentry tree behind the automouter point without
      risking a deadlock as almost no locks are held in d_manage() and none in
      d_automount().
      
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Was-Acked-by: default avatarIan Kent <raven@themaw.net>
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      cc53ce53
    • David Howells's avatar
      Add a dentry op to handle automounting rather than abusing follow_link() · 9875cf80
      David Howells authored
      
      
      Add a dentry op (d_automount) to handle automounting directories rather than
      abusing the follow_link() inode operation.  The operation is keyed off a new
      dentry flag (DCACHE_NEED_AUTOMOUNT).
      
      This also makes it easier to add an AT_ flag to suppress terminal segment
      automount during pathwalk and removes the need for the kludge code in the
      pathwalk algorithm to handle directories with follow_link() semantics.
      
      The ->d_automount() dentry operation:
      
      	struct vfsmount *(*d_automount)(struct path *mountpoint);
      
      takes a pointer to the directory to be mounted upon, which is expected to
      provide sufficient data to determine what should be mounted.  If successful, it
      should return the vfsmount struct it creates (which it should also have added
      to the namespace using do_add_mount() or similar).  If there's a collision with
      another automount attempt, NULL should be returned.  If the directory specified
      by the parameter should be used directly rather than being mounted upon,
      -EISDIR should be returned.  In any other case, an error code should be
      returned.
      
      The ->d_automount() operation is called with no locks held and may sleep.  At
      this point the pathwalk algorithm will be in ref-walk mode.
      
      Within fs/namei.c itself, a new pathwalk subroutine (follow_automount()) is
      added to handle mountpoints.  It will return -EREMOTE if the automount flag was
      set, but no d_automount() op was supplied, -ELOOP if we've encountered too many
      symlinks or mountpoints, -EISDIR if the walk point should be used without
      mounting and 0 if successful.  The path will be updated to point to the mounted
      filesystem if a successful automount took place.
      
      __follow_mount() is replaced by follow_managed() which is more generic
      (especially with the patch that adds ->d_manage()).  This handles transits from
      directories during pathwalk, including automounting and skipping over
      mountpoints (and holding processes with the next patch).
      
      __follow_mount_rcu() will jump out of RCU-walk mode if it encounters an
      automount point with nothing mounted on it.
      
      follow_dotdot*() does not handle automounts as you don't want to trigger them
      whilst following "..".
      
      I've also extracted the mount/don't-mount logic from autofs4 and included it
      here.  It makes the mount go ahead anyway if someone calls open() or creat(),
      tries to traverse the directory, tries to chdir/chroot/etc. into the directory,
      or sticks a '/' on the end of the pathname.  If they do a stat(), however,
      they'll only trigger the automount if they didn't also say O_NOFOLLOW.
      
      I've also added an inode flag (S_AUTOMOUNT) so that filesystems can mark their
      inodes as automount points.  This flag is automatically propagated to the
      dentry as DCACHE_NEED_AUTOMOUNT by __d_instantiate().  This saves NFS and could
      save AFS a private flag bit apiece, but is not strictly necessary.  It would be
      preferable to do the propagation in d_set_d_op(), but that doesn't normally
      have access to the inode.
      
      [AV: fixed breakage in case if __follow_mount_rcu() fails and nameidata_drop_rcu()
      succeeds in RCU case of do_lookup(); we need to fall through to non-RCU case after
      that, rather than just returning with ungrabbed *path]
      
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Was-Acked-by: default avatarIan Kent <raven@themaw.net>
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      9875cf80
    • Al Viro's avatar
      do_lookup() fix · 1a8edf40
      Al Viro authored
      
      
      do_lookup() has a path leading from LOOKUP_RCU case to non-RCU
      crossing of mountpoints, which breaks things badly.  If we
      hit need_revalidate: and do nothing in there, we need to come
      back into LOOKUP_RCU half of things, not to done: in non-RCU
      one.
      
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      1a8edf40
  2. 14 Jan, 2011 27 commits