1. 01 Jul, 2006 2 commits
  2. 30 Jun, 2006 2 commits
  3. 27 Jun, 2006 1 commit
  4. 23 Jun, 2006 1 commit
    • David Howells's avatar
      [PATCH] VFS: Permit filesystem to override root dentry on mount · 454e2398
      David Howells authored
      
      
      Extend the get_sb() filesystem operation to take an extra argument that
      permits the VFS to pass in the target vfsmount that defines the mountpoint.
      
      The filesystem is then required to manually set the superblock and root dentry
      pointers.  For most filesystems, this should be done with simple_set_mnt()
      which will set the superblock pointer and then set the root dentry to the
      superblock's s_root (as per the old default behaviour).
      
      The get_sb() op now returns an integer as there's now no need to return the
      superblock pointer.
      
      This patch permits a superblock to be implicitly shared amongst several mount
      points, such as can be done with NFS to avoid potential inode aliasing.  In
      such a case, simple_set_mnt() would not be called, and instead the mnt_root
      and mnt_sb would be set directly.
      
      The patch also makes the following changes:
      
       (*) the get_sb_*() convenience functions in the core kernel now take a vfsmount
           pointer argument and return an integer, so most filesystems have to change
           very little.
      
       (*) If one of the convenience function is not used, then get_sb() should
           normally call simple_set_mnt() to instantiate the vfsmount. This will
           always return 0, and so can be tail-called from get_sb().
      
       (*) generic_shutdown_super() now calls shrink_dcache_sb() to clean up the
           dcache upon superblock destruction rather than shrink_dcache_anon().
      
           This is required because the superblock may now have multiple trees that
           aren't actually bound to s_root, but that still need to be cleaned up. The
           currently called functions assume that the whole tree is rooted at s_root,
           and that anonymous dentries are not the roots of trees which results in
           dentries being left unculled.
      
           However, with the way NFS superblock sharing are currently set to be
           implemented, these assumptions are violated: the root of the filesystem is
           simply a dummy dentry and inode (the real inode for '/' may well be
           inaccessible), and all the vfsmounts are rooted on anonymous[*] dentries
           with child trees.
      
           [*] Anonymous until discovered from another tree.
      
       (*) The documentation has been adjusted, including the additional bit of
           changing ext2_* into foo_* in the documentation.
      
      [akpm@osdl.org: convert ipath_fs, do other stuff]
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Acked-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      Cc: Nathan Scott <nathans@sgi.com>
      Cc: Roland Dreier <rolandd@cisco.com>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      454e2398
  5. 17 Jun, 2006 10 commits
  6. 24 May, 2006 1 commit
  7. 23 May, 2006 10 commits
  8. 18 May, 2006 1 commit
  9. 17 May, 2006 1 commit
    • Roland Dreier's avatar
      IB/mthca: Make fw_cmd_doorbell default to 0 · 1db76c14
      Roland Dreier authored
      
      
      Setting fw_cmd_doorbell allows FW command to be queued using posted
      writes instead of requiring polling on a "go" bit, so it should be a
      performance boost.  However, the option causes problems with at least
      some device/firmware combinations, so set the default to 0 until we
      understand what's going on better.
      Signed-off-by: default avatarRoland Dreier <rolandd@cisco.com>
      1db76c14
  10. 12 May, 2006 1 commit
    • Roland Dreier's avatar
      IB/ipath: Properly terminate PCI ID table · 6f4bb3d8
      Roland Dreier authored
      
      
      The ipath driver's table of PCI IDs needs a { 0, } entry at the end.
      This makes all of the device aliases visible to userspace so hotplug
      loads the module for all supported devices.  Without the patch,
      modinfo ipath_core only shows:
      
          alias:          pci:v00001FC1d0000000Dsv*sd*bc*sc*i*
      
      instead of the correct:
      
          alias:          pci:v00001FC1d00000010sv*sd*bc*sc*i*
          alias:          pci:v00001FC1d0000000Dsv*sd*bc*sc*i*
      Signed-off-by: default avatarRoland Dreier <rolandd@cisco.com>
      Signed-off-by: default avatarBryan O'Sullivan <bos@pathscale.com>
      6f4bb3d8
  11. 10 May, 2006 1 commit
  12. 09 May, 2006 1 commit
    • Roland Dreier's avatar
      IB/mthca: Fix race in reference counting · a3285aa4
      Roland Dreier authored
      
      
      Fix races in in destroying various objects.  If a destroy routine
      waits for an object to become free by doing
      
      	wait_event(&obj->wait, !atomic_read(&obj->refcount));
      	/* now clean up and destroy the object */
      
      and another place drops a reference to the object by doing
      
      	if (atomic_dec_and_test(&obj->refcount))
      		wake_up(&obj->wait);
      
      then this is susceptible to a race where the wait_event() and final
      freeing of the object occur between the atomic_dec_and_test() and the
      wake_up().  And this is a use-after-free, since wake_up() will be
      called on part of the already-freed object.
      
      Fix this in mthca by replacing the atomic_t refcounts with plain old
      integers protected by a spinlock.  This makes it possible to do the
      decrement of the reference count and the wake_up() so that it appears
      as a single atomic operation to the code waiting on the wait queue.
      
      While touching this code, also simplify mthca_cq_clean(): the CQ being
      cleaned cannot go away, because it still has a QP attached to it.  So
      there's no reason to be paranoid and look up the CQ by number; it's
      perfectly safe to use the pointer that the callers already have.
      Signed-off-by: default avatarRoland Dreier <rolandd@cisco.com>
      a3285aa4
  13. 01 May, 2006 8 commits