Commit Graph

52 Commits

Author SHA1 Message Date
Michel Lespinasse 4c199a93a2 rbtree: empty nodes have no color
Empty nodes have no color.  We can make use of this property to simplify
the code emitted by the RB_EMPTY_NODE and RB_CLEAR_NODE macros.  Also,
we can get rid of the rb_init_node function which had been introduced by
commit 88d19cf379 ("timers: Add rb_init_node() to allow for stack
allocated rb nodes") to avoid some issue with the empty node's color not
being initialized.

I'm not sure what the RB_EMPTY_NODE checks in rb_prev() / rb_next() are
doing there, though.  axboe introduced them in commit 10fd48f237
("rbtree: fixed reversed RB_EMPTY_NODE and rb_next/prev").  The way I
see it, the 'empty node' abstraction is only used by rbtree users to
flag nodes that they haven't inserted in any rbtree, so asking the
predecessor or successor of such nodes doesn't make any sense.

One final rb_init_node() caller was recently added in sysctl code to
implement faster sysctl name lookups.  This code doesn't make use of
RB_EMPTY_NODE at all, and from what I could see it only called
rb_init_node() under the mistaken assumption that such initialization was
required before node insertion.

[sfr@canb.auug.org.au: fix net/ceph/osd_client.c build]
Signed-off-by: Michel Lespinasse <walken@google.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Acked-by: David Woodhouse <David.Woodhouse@intel.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Daniel Santos <daniel.santos@pobox.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: John Stultz <john.stultz@linaro.org>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-10-09 16:22:32 +09:00
Sage Weil 6816282dab ceph: propagate layout error on osd request creation
If we are creating an osd request and get an invalid layout, return
an EINVAL to the caller.  We switch up the return to have an error
code instead of NULL implying -ENOMEM.

Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Alex Elder <elder@inktank.com>
2012-10-01 17:20:00 -05:00
Sage Weil d63b77f4c5 libceph: check for invalid mapping
If we encounter an invalid (e.g., zeroed) mapping, return an error
and avoid a divide by zero.

Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Alex Elder <elder@inktank.com>
2012-10-01 17:20:00 -05:00
Sage Weil 756a16a5d5 libceph: be less chatty about stray replies
There are many (normal) conditions that can lead to us getting
unexpected replies, include cluster topology changes, osd failures,
and timeouts.  There's no need to spam the console about it.

Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Alex Elder <elder@inktank.com>
2012-07-30 18:16:03 -07:00
Jiaju Zhang 048a9d2d06 libceph: trivial fix for the incorrect debug output
This is a trivial fix for the debug output, as it is inconsistent
with the function name so may confuse people when debugging.

[elder@inktank.com: switched to use __func__]

Signed-off-by: Jiaju Zhang <jjzhang@suse.de>
Reviewed-by: Alex Elder <elder@inktank.com>
2012-07-30 18:15:36 -07:00
Sage Weil 6194ea895e libceph: resubmit linger ops when pg mapping changes
The linger op registration (i.e., watch) modifies the object state.  As
such, the OSD will reply with success if it has already applied without
doing the associated side-effects (setting up the watch session state).
If we lose the ACK and resubmit, we will see success but the watch will not
be correctly registered and we won't get notifies.

To fix this, always resubmit the linger op with a new tid.  We accomplish
this by re-registering as a linger (i.e., 'registered') if we are not yet
registered.  Then the second loop will treat this just like a normal
case of re-registering.

This mirrors a similar fix on the userland ceph.git, commit 5dd68b95, and
ceph bug #2796.

Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Alex Elder <elder@inktank.com>
Reviewed-by: Yehuda Sadeh <yehuda@inktank.com>
2012-07-30 18:15:31 -07:00
Sage Weil cd43045c2d libceph: initialize rb, list nodes in ceph_osd_request
These don't strictly need to be initialized based on how they are used, but
it is good practice to do so.

Reported-by: Alex Elder <elder@inktank.com>
Signed-off-by: Sage Weil <sage@inktank.com>
2012-07-30 09:29:51 -07:00
Sage Weil d50b409fb8 libceph: initialize msgpool message types
Initialize the type field for messages in a msgpool.  The caller was doing
this for osd ops, but not for the reply messages.

Reported-by: Alex Elder <elder@inktank.com>
Signed-off-by: Sage Weil <sage@inktank.com>
2012-07-30 09:29:50 -07:00
Sage Weil b7a9e5dd40 libceph: set peer name on con_open, not init
The peer name may change on each open attempt, even when the connection is
reused.

Signed-off-by: Sage Weil <sage@inktank.com>
2012-07-05 21:14:35 -07:00
Sage Weil 9a64e8e0ac Linux 3.5-rc1
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Merge tag 'v3.5-rc1'

Linux 3.5-rc1

Conflicts:
	net/ceph/messenger.c
2012-06-15 12:32:04 -07:00
Alex Elder 8921d114f5 libceph: make ceph_con_revoke_message() a msg op
ceph_con_revoke_message() is passed both a message and a ceph
connection.  A ceph_msg allocated for incoming messages on a
connection always has a pointer to that connection, so there's no
need to provide the connection when revoking such a message.

Note that the existing logic does not preclude the message supplied
being a null/bogus message pointer.  The only user of this interface
is the OSD client, and the only value an osd client passes is a
request's r_reply field.  That is always non-null (except briefly in
an error path in ceph_osdc_alloc_request(), and that drops the
only reference so the request won't ever have a reply to revoke).
So we can safely assume the passed-in message is non-null, but add a
BUG_ON() to make it very obvious we are imposing this restriction.

Rename the function ceph_msg_revoke_incoming() to reflect that it is
really an operation on an incoming message.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
2012-06-06 09:23:55 -05:00
Alex Elder 6740a845b2 libceph: make ceph_con_revoke() a msg operation
ceph_con_revoke() is passed both a message and a ceph connection.
Now that any message associated with a connection holds a pointer
to that connection, there's no need to provide the connection when
revoking a message.

This has the added benefit of precluding the possibility of the
providing the wrong connection pointer.  If the message's connection
pointer is null, it is not being tracked by any connection, so
revoking it is a no-op.  This is supported as a convenience for
upper layers, so they can revoke a message that is not actually
"in flight."

Rename the function ceph_msg_revoke() to reflect that it is really
an operation on a message, not a connection.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
2012-06-06 09:23:54 -05:00
Alex Elder 1c20f2d267 libceph: tweak ceph_alloc_msg()
The function ceph_alloc_msg() is only used to allocate a message
that will be assigned to a connection's in_msg pointer.  Rename the
function so this implied usage is more clear.

In addition, make that assignment inside the function (again, since
that's precisely what it's intended to be used for).  This allows us
to return what is now provided via the passed-in address of a "skip"
variable.  The return type is now Boolean to be explicit that there
are only two possible outcomes.

Make sure the result of an ->alloc_msg method call always sets the
value of *skip properly.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
2012-06-06 09:23:54 -05:00
Alex Elder 1bfd89f4e6 libceph: fully initialize connection in con_init()
Move the initialization of a ceph connection's private pointer,
operations vector pointer, and peer name information into
ceph_con_init().  Rearrange the arguments so the connection pointer
is first.  Hide the byte-swapping of the peer entity number inside
ceph_con_init()

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
2012-06-06 09:23:54 -05:00
Sage Weil 0d47766f14 libceph: use con get/put ops from osd_client
There were a few direct calls to ceph_con_{get,put}() instead of the con
ops from osd_client.c.  This is a bug since those ops aren't defined to
be ceph_con_get/put.

This breaks refcounting on the ceph_osd structs that contain the
ceph_connections, and could lead to all manner of strangeness.

The purpose of the ->get and ->put methods in a ceph connection are
to allow the connection to indicate it has a reference to something
external to the messaging system, *not* to indicate something
external has a reference to the connection.

[elder@inktank.com: added that last sentence]

Signed-off-by: Sage Weil <sage@newdream.net>
Reviewed-by: Alex Elder <elder@inktank.com>
2012-06-06 09:23:54 -05:00
Alex Elder ab8cb34a4b libceph: osd_client: don't drop reply reference too early
In ceph_osdc_release_request(), a reference to the r_reply message
is dropped.  But just after that, that same message is revoked if it
was in use to receive an incoming reply.  Reorder these so we are
sure we hold a reference until we're actually done with the message.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
2012-06-06 09:23:54 -05:00
Alex Elder e10006f807 libceph: provide osd number when creating osd
Pass the osd number to the create_osd() routine, and move the
initialization of fields that depend on it therein.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
2012-06-01 08:37:56 -05:00
Alex Elder 15d9882c33 libceph: embed ceph messenger structure in ceph_client
A ceph client has a pointer to a ceph messenger structure in it.
There is always exactly one ceph messenger for a ceph client, so
there is no need to allocate it separate from the ceph client
structure.

Switch the ceph_client structure to embed its ceph_messenger
structure.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Yehuda Sadeh <yehuda@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
2012-06-01 08:37:56 -05:00
Linus Torvalds af56e0aa35 Merge git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client
Pull ceph updates from Sage Weil:
 "There are some updates and cleanups to the CRUSH placement code, a bug
  fix with incremental maps, several cleanups and fixes from Josh Durgin
  in the RBD block device code, a series of cleanups and bug fixes from
  Alex Elder in the messenger code, and some miscellaneous bounds
  checking and gfp cleanups/fixes."

Fix up trivial conflicts in net/ceph/{messenger.c,osdmap.c} due to the
networking people preferring "unsigned int" over just "unsigned".

* git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client: (45 commits)
  libceph: fix pg_temp updates
  libceph: avoid unregistering osd request when not registered
  ceph: add auth buf in prepare_write_connect()
  ceph: rename prepare_connect_authorizer()
  ceph: return pointer from prepare_connect_authorizer()
  ceph: use info returned by get_authorizer
  ceph: have get_authorizer methods return pointers
  ceph: ensure auth ops are defined before use
  ceph: messenger: reduce args to create_authorizer
  ceph: define ceph_auth_handshake type
  ceph: messenger: check return from get_authorizer
  ceph: messenger: rework prepare_connect_authorizer()
  ceph: messenger: check prepare_write_connect() result
  ceph: don't set WRITE_PENDING too early
  ceph: drop msgr argument from prepare_write_connect()
  ceph: messenger: send banner in process_connect()
  ceph: messenger: reset connection kvec caller
  libceph: don't reset kvec in prepare_write_banner()
  ceph: ignore preferred_osd field
  ceph: fully initialize new layout
  ...
2012-05-30 11:17:19 -07:00
Sage Weil 35f9f8a09e libceph: avoid unregistering osd request when not registered
There is a race between two __unregister_request() callers: the
reply path and the ceph_osdc_wait_request().  If we get a reply
*and* the timeout expires at roughly the same time, both callers
will try to unregister the request, and the second one will do bad
things.

Simply check if the request is still already unregistered; if so,
return immediately and do nothing.

Fixes http://tracker.newdream.net/issues/2420

Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Alex Elder <elder@inktank.com>
2012-05-18 17:36:00 -07:00
Alex Elder 8f43fb5389 ceph: use info returned by get_authorizer
Rather than passing a bunch of arguments to be filled in with the
content of the ceph_auth_handshake buffer now returned by the
get_authorizer method, just use the returned information in the
caller, and drop the unnecessary arguments.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
2012-05-17 08:18:13 -05:00
Alex Elder a3530df33e ceph: have get_authorizer methods return pointers
Have the get_authorizer auth_client method return a ceph_auth
pointer rather than an integer, pointer-encoding any returned
error value.  This is to pave the way for making use of the
returned value in an upcoming patch.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
2012-05-17 08:18:13 -05:00
Alex Elder a255651d4c ceph: ensure auth ops are defined before use
In the create_authorizer method for both the mds and osd clients,
the auth_client->ops pointer is blindly dereferenced.  There is no
obvious guarantee that this pointer has been assigned.  And
furthermore, even if the ops pointer is non-null there is definitely
no guarantee that the create_authorizer or destroy_authorizer
methods are defined.

Add checks in both routines to make sure they are defined (non-null)
before use.  Add similar checks in a few other spots in these files
while we're at it.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
2012-05-17 08:18:13 -05:00
Alex Elder 74f1869f76 ceph: messenger: reduce args to create_authorizer
Make use of the new ceph_auth_handshake structure in order to reduce
the number of arguments passed to the create_authorizor method in
ceph_auth_client_ops.  Use a local variable of that type as a
shorthand in the get_authorizer method definitions.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
2012-05-17 08:18:12 -05:00
Alex Elder 6c4a19158b ceph: define ceph_auth_handshake type
The definitions for the ceph_mds_session and ceph_osd both contain
five fields related only to "authorizers."  Encapsulate those fields
into their own struct type, allowing for better isolation in some
upcoming patches.

Fix the #includes in "linux/ceph/osd_client.h" to lay out their more
complete canonical path.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
2012-05-17 08:18:12 -05:00
Alex Elder 065a68f916 ceph: osd_client: fix endianness bug in osd_req_encode_op()
From Al Viro <viro@zeniv.linux.org.uk>

Al Viro noticed that we were using a non-cpu-encoded value in
a switch statement in osd_req_encode_op().  The result would
clearly not work correctly on a big-endian machine.

Signed-off-by: Alex Elder <elder@dreamhost.com>
2012-05-14 12:12:22 -05:00
Eric Dumazet 95c9617472 net: cleanup unsigned to unsigned int
Use of "unsigned int" is preferred to bare "unsigned" in net tree.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-04-15 12:44:40 -04:00
Sage Weil 56e925b677 libceph: remove useless return value for osd_client __send_request()
Signed-off-by: Sage Weil <sage@newdream.net>
2012-01-10 08:57:03 -08:00
Stratos Psomadakis 224736d911 libceph: Allocate larger oid buffer in request msgs
ceph_osd_request struct allocates a 40-byte buffer for object names.
RBD image names can be up to 96 chars long (100 with the .rbd suffix),
which results in the object name for the image being truncated, and a
subsequent map failure.

Increase the oid buffer in request messages, in order to avoid the
truncation.

Signed-off-by: Stratos Psomadakis <psomas@grnet.gr>
Signed-off-by: Sage Weil <sage@newdream.net>
2011-11-11 09:50:19 -08:00
Sage Weil 38d6453ca3 libceph: force resend of osd requests if we skip an osdmap
If we skip over one or more map epochs, we need to resend all osd requests
because it is possible they remapped to other servers and then back.

Signed-off-by: Sage Weil <sage@newdream.net>
2011-10-25 16:10:17 -07:00
Sage Weil b61c27636f libceph: don't complain on msgpool alloc failures
The pool allocation failures are masked by the pool; there is no need to
spam the console about them.  (That's the whole point of having the pool
in the first place.)

Mark msg allocations whose failure is safely handled as such.

Signed-off-by: Sage Weil <sage@newdream.net>
2011-10-25 16:10:15 -07:00
Sage Weil 935b639a04 libceph: fix linger request requeuing
The r_req_lru_item list node moves between several lists, and that cycle
is not directly related (and does not begin) with __register_request().
Initialize it in the request constructor, not __register_request(). This
fixes later badness (below) when OSDs restart underneath an rbd mount.

Crashes we've seen due to this include:

[  213.974288] kernel BUG at net/ceph/messenger.c:2193!

and

[  144.035274] BUG: unable to handle kernel NULL pointer dereference at 0000000000000048
[  144.035278] IP: [<ffffffffa036c053>] con_work+0x1463/0x2ce0 [libceph]

Signed-off-by: Sage Weil <sage@newdream.net>
2011-09-16 11:13:17 -07:00
Sage Weil aca420bc51 libceph: fix leak of osd structs during shutdown
We want to remove all OSDs, not just those on the idle LRU.

Signed-off-by: Sage Weil <sage@newdream.net>
2011-08-31 15:22:46 -07:00
Sage Weil 4cf9d54463 libceph: don't time out osd requests that haven't been received
Keep track of when an outgoing message is ACKed (i.e., the server fully
received it and, presumably, queued it for processing).  Time out OSD
requests only if it's been too long since they've been received.

This prevents timeouts and connection thrashing when the OSDs are simply
busy and are throttling the requests they read off the network.

Reviewed-by: Yehuda Sadeh <yehuda@hq.newdream.net>
Signed-off-by: Sage Weil <sage@newdream.net>
2011-07-26 11:27:24 -07:00
Sage Weil 9bb0ce2b0b libceph: fix page calculation for non-page-aligned io
Set the page count correctly for non-page-aligned IO.  We were already
doing this correctly for alignment, but not the page count.  Fixes
DIRECT_IO writes from unaligned pages.

Signed-off-by: Sage Weil <sage@newdream.net>
2011-06-13 16:26:17 -07:00
Sage Weil 2584547230 ceph: fix sync vs canceled write
If we cancel a write, trigger the safe completions to prevent a sync from
blocking indefinitely in ceph_osdc_sync().

Signed-off-by: Sage Weil <sage@newdream.net>
2011-06-07 21:34:13 -07:00
Sage Weil cd634fb6ee libceph: subscribe to osdmap when cluster is full
When the cluster is marked full, subscribe to subsequent map updates to
ensure we find out promptly when it is no longer full.  This will prevent
us from spewing ENOSPC for (much) longer than necessary.

Signed-off-by: Sage Weil <sage@newdream.net>
2011-05-24 11:52:11 -07:00
Sage Weil 9d6fcb081a ceph: check return value for start_request in writepages
Since we pass the nofail arg, we should never get an error; BUG if we do.
(And fix the function to not return an error if __map_request fails.)

Signed-off-by: Sage Weil <sage@newdream.net>
2011-05-19 11:25:05 -07:00
Sage Weil 2dab036b8c libceph: use snprintf for formatting object name
Signed-off-by: Sage Weil <sage@newdream.net>
2011-05-19 11:25:02 -07:00
Sage Weil 4ad12621e4 libceph: fix ceph_osdc_alloc_request error checks
ceph_osdc_alloc_request returns NULL on failure.

Signed-off-by: Sage Weil <sage@newdream.net>
2011-05-03 09:28:13 -07:00
Linus Torvalds e6d2831834 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client:
  libceph: fix linger request requeueing
2011-04-14 19:02:55 -07:00
Linus Torvalds 42933bac11 Merge branch 'for-linus2' of git://git.profusion.mobi/users/lucas/linux-2.6
* 'for-linus2' of git://git.profusion.mobi/users/lucas/linux-2.6:
  Fix common misspellings
2011-04-07 11:14:49 -07:00
Sage Weil 77f38e0eea libceph: fix linger request requeueing
Fix the request transition from linger -> normal request.  The key is to
preserve r_osd and requeue on the same OSD.  Reregister as a normal request,
add the request to the proper queues, then unregister the linger.  Fix the
unregister helper to avoid clearing r_osd (and also simplify the parallel
check in __unregister_request()).

Reported-by: Henry Chang <henry.cy.chang@gmail.com>
Signed-off-by: Sage Weil <sage@newdream.net>
2011-04-06 09:09:16 -07:00
Lucas De Marchi 25985edced Fix common misspellings
Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
2011-03-31 11:26:23 -03:00
Sage Weil fbdb919048 libceph: fix null dereference when unregistering linger requests
We should only clear r_osd if we are neither registered as a linger or a
regular request.  We may unregister as a linger while still registered as
a regular request (e.g., in reset_osd).  Incorrectly clearing r_osd there
leads to a null pointer dereference in __send_request.

Also simplify the parallel check in __unregister_request() where we just
removed r_osd_item and know it's empty.

Signed-off-by: Sage Weil <sage@newdream.net>
2011-03-29 12:11:06 -07:00
Dan Carpenter 234af26ff1 ceph: unlock on error in ceph_osdc_start_request()
There was a missing unlock on the error path if __map_request() failed.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Sage Weil <sage@newdream.net>
2011-03-29 08:59:54 -07:00
Mariusz Kozlowski 6b0ae4097c ceph: fix possible NULL pointer dereference
This patch fixes 'event_work' dereference before it is checked for NULL.

Signed-off-by: Mariusz Kozlowski <mk@lab.zgora.pl>
Signed-off-by: Sage Weil <sage@newdream.net>
2011-03-26 13:41:20 -07:00
Yehuda Sadeh a40c4f10e3 libceph: add lingering request and watch/notify event framework
Lingering requests are requests that are sent to the OSD normally but
tracked also after we get a successful request.  This keeps the OSD
connection open and resends the original request if the object moves to
another OSD.  The OSD can then send notification messages back to us
if another client initiates a notify.

This framework will be used by RBD so that the client gets notification
when a snapshot is created by another node or tool.

Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net>
Signed-off-by: Sage Weil <sage@newdream.net>
2011-03-22 11:33:55 -07:00
Sage Weil 6f6c700675 libceph: fix osd request queuing on osdmap updates
If we send a request to osd A, and the request's pg remaps to osd B and
then back to A in quick succession, we need to resend the request to A. The
old code was only calling kick_requests after processing all incremental
maps in a message, so it was very possible to not resend a request that
needed to be resent.  This would make the osd eventually time out (at least
with the current default of osd timeouts enabled).

The correct approach is to scan requests on every map incremental.  This
patch refactors the kick code in a few ways:
 - all requests are either on req_lru (in flight), req_unsent (ready to
   send), or req_notarget (currently map to no up osd)
 - mapping always done by map_request (previous map_osds)
 - if the mapping changes, we requeue.  requests are resent only after all
   map incrementals are processed.
 - some osd reset code is moved out of kick_requests into a separate
   function
 - the "kick this osd" functionality is moved to kick_osd_requests, as it
   is unrelated to scanning for request->pg->osd mapping changes

Signed-off-by: Sage Weil <sage@newdream.net>
2011-03-21 12:24:19 -07:00
Sage Weil c5c6b19d4b ceph: explicitly specify page alignment in network messages
The alignment used for reading data into or out of pages used to be taken
from the data_off field in the message header.  This only worked as long
as the page alignment matched the object offset, breaking direct io to
non-page aligned offsets.

Instead, explicitly specify the page alignment next to the page vector
in the ceph_msg struct, and use that instead of the message header (which
probably shouldn't be trusted).  The alloc_msg callback is responsible for
filling in this field properly when it sets up the page vector.

Signed-off-by: Sage Weil <sage@newdream.net>
2010-11-09 12:43:17 -08:00