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  1. 23 9月, 2006 13 次提交
  3. 15 9月, 2006 1 次提交
  5. 17 8月, 2006 1 次提交
  7. 04 8月, 2006 2 次提交
  9. 03 8月, 2006 1 次提交
  11. 25 7月, 2006 1 次提交
  13. 24 7月, 2006 2 次提交
  15. 15 7月, 2006 5 次提交
  17. 01 7月, 2006 2 次提交
  19. 27 6月, 2006 2 次提交
  21. 23 6月, 2006 1 次提交
    • D
      [PATCH] VFS: Permit filesystem to override root dentry on mount · 454e2398
      由 David Howells 提交于 
      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: NDavid Howells <dhowells@redhat.com>
Acked-by: NAl Viro <viro@zeniv.linux.org.uk>
Cc: Nathan Scott <nathans@sgi.com>
Cc: Roland Dreier <rolandd@cisco.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      454e2398
  23. 22 6月, 2006 2 次提交
    • R
      IB/uverbs: Remove unnecessary list_del()s · 9b8efc02
      由 Roland Dreier 提交于 
      In ib_uverbs_cleanup_ucontext(), when iterating through the lists of
objects, there's no reason to do list_del() to remove the objects,
since both the objects and the lists that contain them are about to be
freed anyway.  Since list_del() is a moderately big inline function,
getting rid of this extra work saves quite a bit of .text:

add/remove: 0/0 grow/shrink: 1/2 up/down: 3/-217 (-214)
function                                     old     new   delta
ib_uverbs_comp_handler                       225     228      +3
ib_uverbs_async_handler                      256     255      -1
ib_uverbs_close                              905     689    -216
Signed-off-by: NRoland Dreier <rolandd@cisco.com>
      9b8efc02
    • K
      IB/uverbs: Don't free wr list when it's known to be empty · 18320828
      由 Krishna Kumar 提交于 
      In ib_uverbs_post_send(), move the "out:" label after the loop that
frees the list of work requests, since the only place that jumps there
is before any work requests could possibly be added to the list.

This removes a compile warning: "is_ud might be used uninitialized in
this function".
Signed-off-by: NKrishna Kumar <krkumar2@in.ibm.com>
Signed-off-by: NRoland Dreier <rolandd@cisco.com>
      18320828
  25. 18 6月, 2006 7 次提交
    • R
      IB/uverbs: Don't serialize with ib_uverbs_idr_mutex · 9ead190b
      由 Roland Dreier 提交于 
      Currently, all userspace verbs operations that call into the kernel
are serialized by ib_uverbs_idr_mutex.  This can be a scalability
issue for some workloads, especially for devices driven by the ipath
driver, which needs to call into the kernel even for datapath
operations.

Fix this by adding reference counts to the userspace objects, and then
converting ib_uverbs_idr_mutex into a spinlock that only protects the
idrs long enough to take a reference on the object being looked up.
Because remove operations may fail, we have to do a slightly funky
two-step deletion, which is described in the comments at the top of
uverbs_cmd.c.

This also still leaves ib_uverbs_idr_lock as a single lock that is
possibly subject to contention.  However, the lock hold time will only
be a single idr operation, so multiple threads should still be able to
make progress, even if ib_uverbs_idr_lock is being ping-ponged.

Surprisingly, these changes even shrink the object code:

add/remove: 23/5 grow/shrink: 4/21 up/down: 633/-693 (-60)
Signed-off-by: NRoland Dreier <rolandd@cisco.com>
      9ead190b
    • R
      IB/uverbs: Factor out common idr code · 3463175d
      由 Roland Dreier 提交于 
      Factor out common code for adding a userspace object to an idr into a
function idr_add_uobj().  This shrinks both the source and object code:

add/remove: 1/0 grow/shrink: 0/6 up/down: 57/-220 (-163)
function                                     old     new   delta
idr_add_uobj                                   -      57     +57
ib_uverbs_create_ah                          543     512     -31
ib_uverbs_create_srq                         662     630     -32
ib_uverbs_reg_mr                             737     699     -38
ib_uverbs_create_cq                          639     600     -39
ib_uverbs_alloc_pd                           485     446     -39
ib_uverbs_create_qp                         1020     979     -41
Signed-off-by: NRoland Dreier <rolandd@cisco.com>
      3463175d
    • R
      IB/uverbs: Don't decrement usecnt on error paths · 92b15822
      由 Roland Dreier 提交于 
      In error paths when destroying an object, uverbs should not decrement
associated objects' usecnt, since ib_dereg_mr(), ib_destroy_qp(),
etc. already do that.
Signed-off-by: NRoland Dreier <rolandd@cisco.com>
      92b15822
    • G
      IB/uverbs: Release lock on error path · 77f76013
      由 Ganapathi CH 提交于 
      If ibdev->alloc_ucontext() fails then ib_uverbs_get_context() does not
unlock file->mutex before returning error.

Signed-off by: Ganapathi CH <cganapathi@novell.com>
Signed-off-by: NRoland Dreier <rolandd@cisco.com>
      77f76013
    • S
      IB/cm: Use address handle helpers · ca222c6b
      由 Sean Hefty 提交于 
      Use new ib_init_ah_from_wc() and ib_init_ah_from_path() helper
functions to clean up the IB CM.
Signed-off-by: NSean Hefty <sean.hefty@intel.com>
Signed-off-by: NRoland Dreier <rolandd@cisco.com>
      ca222c6b
    • S
      IB/sa: Add ib_init_ah_from_path() · 6d969a47
      由 Sean Hefty 提交于 
      Add a call to initialize address handle attributes given a path record.
This is used by the CM, and would be useful for users of UD QPs.
Signed-off-by: NSean Hefty <sean.hefty@intel.com>
Signed-off-by: NRoland Dreier <rolandd@cisco.com>
      6d969a47
    • S
      IB: Add ib_init_ah_from_wc() · 4e00d694
      由 Sean Hefty 提交于 
      Add a function to initialize address handle attributes from a work
completion.  This functionality is duplicated by both verbs and the CM.
Signed-off-by: NSean Hefty <sean.hefty@intel.com>
Signed-off-by: NRoland Dreier <rolandd@cisco.com>
      4e00d694