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Alex Elder [Sat, 27 Apr 2013 14:59:30 +0000 (09:59 -0500)]
rbd: set mapping info earlier
Set the mapping size and features earlier in rbd_dev_probe_finish().
Define rbd_dev_mapping_clear() as an inverse for setting those
fields, and use it both in error handling in rbd_dev_image_probe()
and in the final cleanup in rbd_dev_release(). Change the name
of rbd_dev_set_mapping() to of rbd_dev_mapping_set().
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 26 Apr 2013 20:44:36 +0000 (15:44 -0500)]
rbd: encapsulate removing parent devices
Encapsulate the code that removes an rbd device's parent images into
a new function, rbd_dev_remove_parent().
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 26 Apr 2013 20:44:36 +0000 (15:44 -0500)]
rbd: encapsulate probing for parent devices
Encapsulate the code that probes for an rbd device's parent images
into a new function, rbd_dev_probe_parent().
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 26 Apr 2013 20:44:36 +0000 (15:44 -0500)]
rbd: defer setting disk capacity
Don't set the disk capacity until right before we announce the
device as available for use.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 26 Apr 2013 20:44:36 +0000 (15:44 -0500)]
rbd: only set device exists flag when ready
Hold off setting the EXISTS rbd device flag until just before we
announce the disk as available for use. There's no point in doing
so any earlier than that, and at that point the device truly is
fully set up and ready to use.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 26 Apr 2013 20:44:36 +0000 (15:44 -0500)]
rbd: fix up some sysfs stuff
This just tweaks a few things in the routines that implement
rbd sysfs files.
All of the entries for an rbd device in /sys/bus/rbd/devices/<id>/
will represent information whose valid values are known by the time
they are accessible.
Right now we get the size of the mapped image by a call to
get_capacity(). There's no need to do this, because that will
return what we last set the capacity to, which is just the size
recorded for the mapping. So just show that value instead.
We also get this under protection of the header semaphore, in order
to provide a precisely correct value. This isn't really necessary;
these files are really informational only and it's not necessary to
be so careful.
Finally, print a special value in case the major device number is
not recorded. Right now that won't matter much but soon the parent
images won't have devices associated with them.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 26 Apr 2013 20:44:35 +0000 (15:44 -0500)]
rbd: fix a bug in resizing a mapping
When a snapshot context update occurs, rbd_update_mapping_size() is
called to set the capacity of the disk to record the updated
size of the image in case it has changed.
There's a bug though. The mapping size is in units of *bytes*. The
code that updates the mapping size field is assigning a value that
has been scaled down to *sectors*.
Fix that. Also, check to see if the size has actually changed, and
don't bother updating things (specifically, calling set_capacity())
if it has not.
This resolves:
http://tracker.ceph.com/issues/4833
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 26 Apr 2013 14:43:48 +0000 (09:43 -0500)]
rbd: refactor rbd_dev_probe_update_spec()
Fairly straightforward refactoring of rbd_dev_probe_update_spec().
The name is changed to rbd_dev_spec_update().
Rearrange it so nothing gets assigned to the spec until all of the
names have been successfully acquired.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 26 Apr 2013 14:43:48 +0000 (09:43 -0500)]
rbd: rename rbd_dev_probe()
Rename rbd_dev_probe() to be rbd_dev_image_probe(). Its purpose
will eventually be to probe for the existence of a valid rbd image
for the rbd device--focusing only on the ceph side and not the Linux
device side of initialization.
For now the two "sides" are not fully separated, and this function
is still the entry point for initializing the full rbd device.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 26 Apr 2013 14:43:47 +0000 (09:43 -0500)]
rbd: make rbd_dev_destroy() match rbd_dev_create()
Currently, rbd_dev_destroy() does more than just the inverse of what
rbd_dev_create() does. Stop doing that, and move the two extra
things it does into the three call sites.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 26 Apr 2013 14:43:47 +0000 (09:43 -0500)]
rbd: define rbd snap context routines
Encapsulate the creation of a snapshot context for rbd in a new
function rbd_snap_context_create(). Define rbd wrappers for getting
and dropping references to them once they're created.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 26 Apr 2013 14:43:47 +0000 (09:43 -0500)]
rbd: use rbd_warn(), not WARN_ON()
Change some calls to WARN_ON() so they use rbd_warn() instead, so we
get consistent messaging. A few remain but they can probably just
go away eventually.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 26 Apr 2013 14:43:47 +0000 (09:43 -0500)]
rbd: move stripe_unit and stripe_count into header
This commit added fetching if fancy striping parameters:
09186ddb rbd: get and check striping parameters
They are almost unused, but the two fields storing the information
really belonged in the rbd_image_header structure.
This patch moves them there.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 26 Apr 2013 14:43:47 +0000 (09:43 -0500)]
rbd: make rbd spec names pointer to const
Make the names and image id in an rbd_spec be pointers to constant
data. This required the use of a local variable to hold the
snapshot name in rbd_add_parse_args() to avoid a warning.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 26 Apr 2013 04:15:08 +0000 (23:15 -0500)]
rbd: set snapshot id in rbd_dev_probe_update_spec()
Set the rbd spec's snapshot id for an image getting mapped in
rbd_dev_probe_update_spec() rather than rbd_dev_set_mapping().
This is the more logical place for that to happen (even though
it means we might look up the snapshot by name twice).
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 26 Apr 2013 04:15:08 +0000 (23:15 -0500)]
rbd: have snap_by_name() return a snapshot
A function called snap_by_name() ought to just look up a snapshot by
name. It does that, but then it assigns some stuff to the rbd
device structure as well.
Change the function to do just the lookup, and have the caller do
the assignments that follow.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 26 Apr 2013 04:15:08 +0000 (23:15 -0500)]
rbd: fix image id leak in initial probe
If a format 2 image id is found for an image being mapped, but the
subsequent probe of the image fails, rbd_dev_probe() quits without
freeing the image id. Fix that.
Also drop a redundant hunk of code in rbd_dev_image_id().
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 26 Apr 2013 04:15:08 +0000 (23:15 -0500)]
rbd: have rbd_dev_image_id() set format 1 image id
Currently, rbd_dev_probe() assumes that any error returned by
rbd_dev_image_id() is most likely -ENOENT, and responds by
calling the format 1 probe routine, rbd_dev_v1_probe(). Then,
at the top of rbd_dev_v1_probe(), an empty string is allocated
for the image id.
This is sort of unbalanced. Fix this by having rbd_dev_image_id()
look for -ENOENT from its "get_id" method call. If that is seen,
have it allocate the empty string there rather than depending on
rbd_dev_v1_probe() to do it.
Given that this is effectively defining the format of the image,
set rbd_dev->image_format inside rbd_dev_image_id() rather than in
the format-specific probe routines.
Also drop a redundant hunk of code in rbd_dev_image_id().
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 26 Apr 2013 04:15:08 +0000 (23:15 -0500)]
rbd: avoid dropping extra reference in rbd_free_disk()
I found during some failure injection testing that the call to
rbd_free_disk() in the error path of rbd_dev_probe_finish() was
dropping an extra reference to the disk queue. The problem
occurred when put_disk tried to drop a reference to the disk's
queue. A call to blk_cleanup_queue() just prior to that will have
also dropped a reference to the queue.
The problem is that the reference dropped by put_disk() is assumed
to have been taken by add_disk(). Our code has error paths that can
occur after the disk and its queue are initialized, but before the
call to add_disk(), and in those paths we won't have that extra
reference.
The fix is easy though. In rbd_free_disk() we're already checking
the disk's GENHD_FL_UP flag. That flag is an indication that
add_disk() has been called, so just call blk_cleanup_queue()
conditional on that flag being set.
This resolves:
http://tracker.ceph.com/issues/4800
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Thu, 25 Apr 2013 20:09:42 +0000 (15:09 -0500)]
rbd: use rbd_obj_method_sync() return value
Now that rbd_obj_method_sync() returns the number of bytes
returned by the method call, that value should be used by
callers to ensure we don't overrun the valid portion of the
buffer.
Fix the two spots that remained that weren't doing that,
rbd_dev_image_name() and rbd_dev_v2_snap_name().
Rearrange the error path slightly in rbd_dev_v2_snap_name().
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Thu, 25 Apr 2013 20:09:42 +0000 (15:09 -0500)]
rbd: fix leak of format 2 snapshot names
When the snapshot context for an rbd device gets updated (or the
initial one is recorded) a a list of snapshot structures is created
to represent them, one entry per snapshot. Each entry includes a
dynamically-allocated copy of the snapshot name.
Currently the name is allocated in rbd_snap_create(), as a duplicate
of the passed-in name.
For format 1 images, the snapshot name provided is just a pointer to
an existing name. But for format 2 images, the passed-in name is
already dynamically allocated, and in the the process of duplicating
it here we are leaking the passed-in name.
Fix this by dynamically allocating the name for format 1 snapshots
also, and then stop allocating a duplicate in rbd_snap_create().
Change rbd_dev_v1_snap_info() so none of its parameters is
side-effected unless it's going to return success.
This is part of:
http://tracker.ceph.com/issues/4803
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Thu, 25 Apr 2013 20:09:41 +0000 (15:09 -0500)]
rbd: rename __rbd_add_snap_dev()
Rename __rbd_add_snap_dev() to be rbd_snap_create(). We no longer
have devices for non-mapped snapshots, and we're not actually
"adding" it to the list in this function, just creating it.
Rename rbd_remove_snap_dev() to be rbd_snap_destroy() for reasons
similar to the above. Stop having this function delete the snapshot
from its list (to be symmetrical with its create counterpart) and do
that in the caller instead.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Thu, 25 Apr 2013 20:09:41 +0000 (15:09 -0500)]
rbd: only update values on snap_info success
Change rbd_dev_v2_snap_info() so it only ever sets values of the
size and features parameters if looking up the snapshot name was
successful.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Thu, 25 Apr 2013 20:09:41 +0000 (15:09 -0500)]
rbd: make snap_size order parameter optional
Only one of the two callers of _rbd_dev_v2_snap_size() needs the
order value returned. So make that an optional argument--a null
pointer if the caller doesn't need it.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Thu, 25 Apr 2013 20:09:41 +0000 (15:09 -0500)]
rbd: fix leak of snapshots during initial probe
When an rbd image is initially mapped, its snapshot context is
collected, and then a list of snapshot entries representing the
snapshots in that context is created. The list is created using
rbd_dev_snaps_update(). (This function also supports updating an
existing snapshot list based on a new snapshot context.)
If an error occurs, updating the list is aborted, and the list is
currently left as-is, in an inconsistent state. At that point,
there may be a partially-constructed list, but the calling functions
(rbd_dev_probe_finish() from rbd_dev_probe() from rbd_add()) never
clean them up. So this constitutes a leak.
A snapshot list that is inconsistent with the current snapshot
context is of no use, and might even be actively bad. So rather
than just having the caller clean it up, have rbd_dev_snaps_update()
just clear out the entire snapshot list in the event an error
occurs.
The other place rbd_dev_snaps_update() is used is when a refresh is
triggered, either because of a watch callback or via a write to the
/sys/bus/rbd/devices/<id>/refresh interface. An error while
updating the snapshots has no substantive effect in either of those
cases, but one of them issues a warning. Move that warning to the
common rbd_dev_refresh() function so it gets issued regardless of
how it got initiated.
This is part of:
http://tracker.ceph.com/issues/4803
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Tue, 23 Apr 2013 18:52:53 +0000 (13:52 -0500)]
rbd: don't create sysfs entries for non-mapped snapshots
When an rbd image gets mapped a device entry gets created for it
under /sys/bus/rbd/devices/<id>/. Inside that directory there are
sysfs files that contain information about the image: its size,
feature bits, major device number, and so on.
Additionally, if that image has any snapshots, a device entry gets
created for each of those as a "child" of the mapped device. Each
of these is a subdirectory of the mapped device, and each directory
contains a few files with information about the snapshot (its
snapshot id, size, and feature mask).
There is no clear benefit to having those device entries for the
snapshots. The information provided via sysfs of of little real
value--and all of it is available via rbd CLI commands. If we
still wanted to see the kernel's view of this information it could
be done much more simply by including it in a single sysfs file for
the mapped image.
But there *is* a clear cost to supporting them. Every time a snapshot
context changes, these entries need to be updated (deleted snapshots
removed, new snapshots created). The rbd driver is notified of
changes to the snapshot context via callbacks from an osd, and care
must be taken to coordinate removal of snapshot data structures
with the possibility of one these notifications occurring.
Things would be considerably simpler if we just didn't have to
maintain device entries for the snapshots.
So get rid of them.
The ability to map a snapshot of an rbd image will remain; the only
thing lost will be the ability to query these sysfs directories for
information about snapshots of mapped images.
This resolves:
http://tracker.ceph.com/issues/4796
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Sun, 21 Apr 2013 21:51:50 +0000 (16:51 -0500)]
libceph: fix byte order mismatch
A WATCH op includes an object version. The version that's supplied
is incorrectly byte-swapped osd_req_op_watch_init() where it's first
assigned (it's been this way since that code was first added).
The result is that the version sent to the osd is wrong, because
that value gets byte-swapped again in osd_req_encode_op(). This
is the source of a sparse warning related to improper byte order in
the assignment.
The approach of using the version to avoid a race is deprecated
(see http://tracker.ceph.com/issues/3871), and the watch parameter
is no longer even examined by the osd. So fix the assignment in
osd_req_op_watch_init() so it no longer does the byte swap.
This resolves:
http://tracker.ceph.com/issues/3847
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 26 Oct 2012 04:34:40 +0000 (23:34 -0500)]
rbd: activate support for layered images
Now that we have most everything in place to support layered rbd
images, enable support for them in the kernel client. Issue a
warning to the log that the support is considered experimental
whenever a format 2 layered image is mapped.
Note that we also have to claim to support the STRIPINGV2 feature,
due to a mistake in the way the rbd CLI set up those flags. This
feature can work if it has the right parameters, and safeguards
have been put in place to reject those images that do not have
compatible parameters.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Sun, 21 Apr 2013 17:14:45 +0000 (12:14 -0500)]
rbd: get and check striping parameters
If an rbd format 2 image indicates it supports the STRIPINGV2
feature we need to find out its stripe unit and stripe count in
order to know whether we can use it. We don't yet support fancy
striping fully, but if the default parameters are used the behavior
is indistinguishible from non-fancy striping.
This is necessary because some images require the STRIPINGV2 feature
even if they use the default parameters. (Which is to say the feature
bit was erroneously set even if the feature was not used.)
This resolves:
http://tracker.ceph.com/issues/4709
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Sun, 21 Apr 2013 17:14:45 +0000 (12:14 -0500)]
rbd: have rbd_obj_method_sync() return transfer count
Callers of rbd_obj_method_sync() don't know how many bytes of data
got returned by the class method call. As a result, they have been
assuming enough got returned to decode whatever was expected.
This isn't safe. We know how many bytes got transferred, so have
rbd_obj_method_sync() return that amount (rather than just 0) if
the call is successful.
Change all callers to use this return value to ensure decoding of
the results is done safely.
On the other hand, most callers of rbd_obj_method_sync() only
indicate success or failure, so all of *their* callers can simply
test for non-zero result.
This resolves:
http://tracker.ceph.com/issues/4773
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Sun, 21 Apr 2013 17:14:45 +0000 (12:14 -0500)]
rbd: void data pointers for rbd_obj_method_sync()
Make the inbound and outbound data parameters have void rather than
character type for rbd_obj_method_sync(). This makes it more clear
they don't expect typed data, and eliminates the need for some silly
type casts.
One more unrelated change: define the features buffer used in
_rbd_dev_v2_snap_features() to be a packed data structure.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Sun, 21 Apr 2013 17:14:45 +0000 (12:14 -0500)]
rbd: give rbd_obj_read_sync() buffer void type
Make the buf parameter into which the data is to be read have type
void pointer.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 19 Apr 2013 20:34:50 +0000 (15:34 -0500)]
libceph: validate timespec conversions
A ceph timespec contains 32-bit unsigned values for its seconds and
nanoseconds components. For a standard timespec, both fields are
signed, and the seconds field is almost surely 64 bits.
Add some explicit casts so the fact that this conversion is taking
place is obvious. Also trip a bug if we ever try to put out of
range (negative or too big) values into a ceph timespec.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 19 Apr 2013 20:34:50 +0000 (15:34 -0500)]
libceph: add signed type limits
Flesh out the limits defined in <linux/ceph/decode.h> to include the
maximum and minimum values for signed type S8, S16, S32, and S64.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Sun, 21 Apr 2013 05:32:07 +0000 (00:32 -0500)]
rbd: enforce parent overlap
A clone image has a defined overlap point with its parent image.
That is the byte offset beyond which the parent image has no
defined data to back the clone, and anything thereafter can be
viewed as being zero-filled by the clone image.
This is needed because a clone image can be resized. If it gets
resized larger than the snapshot it is based on, the overlap defines
the original size. If the clone gets resized downward below the
original size the new clone size defines the overlap. If the clone
is subsequently resized to be larger, the overlap won't be increased
because the previous resize invalidated any parent data beyond that
point.
This resolves:
http://tracker.ceph.com/issues/4724
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 19 Apr 2013 20:34:50 +0000 (15:34 -0500)]
rbd: issue a copyup for layered writes
This implements the main copyup functionality for layered writes.
Here we add a copyup_pages field to the object request, which is
used only for copyup requests to keep track of the page array
containing data read from the parent image.
A copyup request is currently the only request rbd has that requires
two osd operations. Because of this we handle copyup specially.
All image object requests get an osd request allocated when they are
created. For a write request, if a copyup is required, the osd
request originally allocated is released, and a new one (with room
for two osd ops) is allocated to replace it. A new function
rbd_osd_req_create_copyup() allocates an osd request suitable for
a copyup request.
The first op is then filled with a copyup object class method call,
supplying the array of pages containing data read from the parent.
The second op is filled in with the original write request.
The original request otherwise remains intact, and it describes the
original write request (found in the second osd op). The presence
of the copyup op is sort of implicit; a non-null copyup_pages field
could be used to distinguish between a "normal" write request and a
request containing both a copyup call and a write.
This resolves:
http://tracker.ceph.com/issues/3419
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 19 Apr 2013 20:34:50 +0000 (15:34 -0500)]
rbd: implement full object parent reads
As a step toward implementing layered writes, implement reading the
data for a target object from the parent image for a write request
whose target object is known to not exist. Add a copyup_pages field
to an image request to track the page array used (only) for such a
request.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Laurent Barbe [Wed, 10 Apr 2013 22:47:46 +0000 (17:47 -0500)]
rbd: revalidate_disk upon rbd resize
If rbd disk is open and rbd resize is done, new size is not
visible by filesystem. Like is done in virtio-blk and dm driver,
revalidate_disk() permits to update the bd_inode size.
Signed-off-by: Laurent Barbe <laurent@ksperis.com>
Reviewed-by: Alex Elder <elder@inktank.com>
Alex Elder [Fri, 19 Apr 2013 20:34:50 +0000 (15:34 -0500)]
rbd: support page array image requests
This patch adds the ability to build an image request whose data
will be written from or read into memory described by a page array.
(Previously only bio lists were supported.)
Originally this was going to define a new function for this purpose
but it was largely identical to the rbd_img_request_fill_bio(). So
instead, rbd_img_request_fill_bio() has been generalized to handle
both types of image request.
For the moment we still only fill image requests with bio data.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 19 Apr 2013 20:34:50 +0000 (15:34 -0500)]
rbd: define zero_pages()
Define a new function zero_pages() that zeroes a range of memory
defined by a page array, along the lines of zero_bio_chain(). It
saves and the irq flags like bvec_kmap_irq() does, though I'm not
sure at this point that it's necessary.
Update rbd_img_obj_request_read_callback() to use the new function
if the object request contains page rather than bio data.
For the moment, only bio data is used for osd READ ops.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 19 Apr 2013 20:34:50 +0000 (15:34 -0500)]
rbd: encapsulate submission of image object requests
Object requests that are part of an image request are subject to
some additional handling. Define rbd_img_obj_request_submit() to
encapsulate that, and use it when initially submitting an image
object request, and when re-submitting it during callback of
an object existence check.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 19 Apr 2013 20:34:50 +0000 (15:34 -0500)]
rbd: define separate read and write format funcs
Separate rbd_osd_req_format() into two functions, one for read
requests and the other for write requests.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 19 Apr 2013 20:34:49 +0000 (15:34 -0500)]
libceph: support pages for class request data
Add the ability to provide an array of pages as outbound request
data for object class method calls.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 19 Apr 2013 20:34:49 +0000 (15:34 -0500)]
libceph: fix two messenger bugs
This patch makes four small changes in the ceph messenger.
While getting copyup functionality working I found two bugs in the
messenger. Existing paths through the code did not trigger these
problems, but they're fixed here:
- In ceph_msg_data_pagelist_cursor_init(), the cursor's
last_piece field was being checked against the length
supplied. This was OK until this commit:
ccba6d98 libceph:
implement multiple data items in a message That commit changed
the cursor init routines to allow lengths to be supplied that
exceeded the size of the current data item. Because of this,
we have to use the assigned cursor resid field rather than the
provided length in determining whether the cursor points to
the last piece of a data item.
- In ceph_msg_data_add_pages(), a BUG_ON() was erroneously
catching attempts to add page data to a message if the message
already had data assigned to it. That was OK until that same
commit, at which point it was fine for messages to have
multiple data items. It slipped through because that BUG_ON()
call was present twice in that function. (You can never be too
careful.)
In addition two other minor things are changed:
- In ceph_msg_data_cursor_init(), the local variable "data" was
getting assigned twice.
- In ceph_msg_data_advance(), it was assumed that the
type-specific advance routine would set new_piece to true
after it advanced past the last piece. That may have been
fine, but since we check for that case we might as well set it
explicitly in ceph_msg_data_advance().
This resolves:
http://tracker.ceph.com/issues/4762
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Mon, 11 Feb 2013 18:33:24 +0000 (12:33 -0600)]
rbd: issue stat request before layered write
This is a step toward fully implementing layered writes.
Add checks before request submission for the object(s) associated
with an image request. For write requests, if we don't know that
the target object exists, issue a STAT request to find out. When
that request completes, mark the known and exists flags for the
original object request accordingly and re-submit the object
request. (Note that this still does the existence check only; the
copyup operation is not yet done.)
A new object request is created to perform the existence check. A
pointer to the original request is added to that object request to
allow the stat request to re-issue the original request after
updating its flags. If there is a failure with the stat request
the error code is stored with the original request, which is then
completed.
This resolves:
http://tracker.ceph.com/issues/3418
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Mon, 11 Feb 2013 18:33:24 +0000 (12:33 -0600)]
rbd: add target object existence flags
This creates two new flags for object requests to indicate what is
known about the existence of the object to which a request is to be
sent. The KNOWN flag will be true if the the EXISTS flag is
meaningful. That is:
KNOWN EXISTS
----- ------
0 0 don't know whether the object exists
0 1 (not used/invalid)
1 0 object is known to not exist
1 0 object is known to exist
This will be used in determining how to handle write requests for
data objects for layered rbd images.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Mon, 11 Feb 2013 18:33:24 +0000 (12:33 -0600)]
rbd: always check IMG_DATA flag
In a few spots, whether the an object request's img_request pointer
is null is used to determine whether an object request is being done
as part of an image data request.
Stop doing that, and instead always use the object request IMG_DATA
flag for that purpose. Swap the order of the definition of the
IMG_DATA and DONE flag helpers, because obj_request_done_set() now
refers to obj_request_img_data_set() to get its rbd_dev value.
This will become important because the img_request pointer is
about to become part of a union.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Mon, 15 Apr 2013 19:50:37 +0000 (14:50 -0500)]
rbd: adjust image object request ref counting
An extra reference is taken when an object request is added as one
of the requests making up an image object. A reference is dropped
again when the image's object requests get submitted.
The original reference for the object request will remain throughout
this period, so we don't need to add and then take away an extra
one.
This can be interpreted as the image request inheriting the original
object request's reference.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Mon, 11 Feb 2013 18:33:24 +0000 (12:33 -0600)]
libceph: support raw data requests
Allow osd request ops that aren't otherwise structured (not class,
extent, or watch ops) to specify "raw" data to be used to hold
incoming data for the op. Make use of this capability for the osd
STAT op.
Prefix the name of the private function osd_req_op_init() with "_",
and expose a new function by that (earlier) name whose purpose is to
initialize osd ops with (only) implied data.
For now we'll just support the use of a page array for an osd op
with incoming raw data.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Mon, 15 Apr 2013 19:50:36 +0000 (14:50 -0500)]
libceph: clean up osd data field access functions
There are a bunch of functions defined to encapsulate getting the
address of a data field for a particular op in an osd request.
They're all defined the same way, so create a macro to take the
place of all of them.
Two of these are used outside the osd client code, so preserve them
(but convert them to use the new macro internally). Stop exporting
the ones that aren't used elsewhere.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Mon, 15 Apr 2013 19:50:36 +0000 (14:50 -0500)]
libceph: kill off osd data write_request parameters
In the incremental move toward supporting distinct data items in an
osd request some of the functions had "write_request" parameters to
indicate, basically, whether the data belonged to in_data or the
out_data. Now that we maintain the data fields in the op structure
there is no need to indicate the direction, so get rid of the
"write_request" parameters.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Randy Dunlap [Fri, 19 Apr 2013 21:20:07 +0000 (14:20 -0700)]
ceph: fix printk format warnings in file.c
Fix printk format warnings by using %zd for 'ssize_t' variables:
fs/ceph/file.c:751:2: warning: format '%ld' expects argument of type 'long int', but argument 11 has type 'ssize_t' [-Wformat]
fs/ceph/file.c:762:2: warning: format '%ld' expects argument of type 'long int', but argument 11 has type 'ssize_t' [-Wformat]
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: ceph-devel@vger.kernel.org
Signed-off-by: Sage Weil <sage@inktank.com>
Yan, Zheng [Fri, 12 Apr 2013 13:45:42 +0000 (21:45 +0800)]
ceph: fix race between writepages and truncate
ceph_writepages_start() reads inode->i_size in two places. It can get
different values between successive read, because truncate can change
inode->i_size at any time. The race can lead to mismatch between data
length of osd request and pages marked as writeback. When osd request
finishes, it clear writeback page according to its data length. So
some pages can be left in writeback state forever. The fix is only
read inode->i_size once, save its value to a local variable and use
the local variable when i_size is needed.
Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
Reviewed-by: Alex Elder <elder@inktank.com>
Yan, Zheng [Fri, 12 Apr 2013 08:11:13 +0000 (16:11 +0800)]
ceph: apply write checks in ceph_aio_write
copy write checks in __generic_file_aio_write to ceph_aio_write.
To make these checks cover sync write path.
Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
Reviewed-by: Alex Elder <elder@inktank.com>
Yan, Zheng [Fri, 12 Apr 2013 08:11:10 +0000 (16:11 +0800)]
ceph: take i_mutex before getting Fw cap
There is deadlock as illustrated bellow. The fix is taking i_mutex
before getting Fw cap reference.
write truncate MDS
--------------------- -------------------- --------------
get Fw cap
lock i_mutex
lock i_mutex (blocked)
request setattr.size ->
<- revoke Fw cap
Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
Reviewed-by: Alex Elder <elder@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
Alex Elder [Mon, 15 Apr 2013 16:20:42 +0000 (11:20 -0500)]
libceph: change how "safe" callback is used
An osd request currently has two callbacks. They inform the
initiator of the request when we've received confirmation for the
target osd that a request was received, and when the osd indicates
all changes described by the request are durable.
The only time the second callback is used is in the ceph file system
for a synchronous write. There's a race that makes some handling of
this case unsafe. This patch addresses this problem. The error
handling for this callback is also kind of gross, and this patch
changes that as well.
In ceph_sync_write(), if a safe callback is requested we want to add
the request on the ceph inode's unsafe items list. Because items on
this list must have their tid set (by ceph_osd_start_request()), the
request added *after* the call to that function returns. The
problem with this is that there's a race between starting the
request and adding it to the unsafe items list; the request may
already be complete before ceph_sync_write() even begins to put it
on the list.
To address this, we change the way the "safe" callback is used.
Rather than just calling it when the request is "safe", we use it to
notify the initiator the bounds (start and end) of the period during
which the request is *unsafe*. So the initiator gets notified just
before the request gets sent to the osd (when it is "unsafe"), and
again when it's known the results are durable (it's no longer
unsafe). The first call will get made in __send_request(), just
before the request message gets sent to the messenger for the first
time. That function is only called by __send_queued(), which is
always called with the osd client's request mutex held.
We then have this callback function insert the request on the ceph
inode's unsafe list when we're told the request is unsafe. This
will avoid the race because this call will be made under protection
of the osd client's request mutex. It also nicely groups the setup
and cleanup of the state associated with managing unsafe requests.
The name of the "safe" callback field is changed to "unsafe" to
better reflect its new purpose. It has a Boolean "unsafe" parameter
to indicate whether the request is becoming unsafe or is now safe.
Because the "msg" parameter wasn't used, we drop that.
This resolves the original problem reportedin:
http://tracker.ceph.com/issues/4706
Reported-by: Yan, Zheng <zheng.z.yan@intel.com>
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Yan, Zheng <zheng.z.yan@intel.com>
Reviewed-by: Sage Weil <sage@inktank.com>
Alex Elder [Mon, 15 Apr 2013 16:18:01 +0000 (11:18 -0500)]
ceph: let osd client clean up for interrupted request
In ceph_sync_write(), if a safe callback is supplied with a request,
and an error is returned by ceph_osdc_wait_request(), a block of
code is executed to remove the request from the unsafe writes list
and drop references to capabilities acquired just prior to a call to
ceph_osdc_wait_request().
The only function used for this callback is sync_write_commit(),
and it does *exactly* what that block of error handling code does.
Now in ceph_osdc_wait_request(), if an error occurs (due to an
interupt during a wait_for_completion_interruptible() call),
complete_request() gets called, and that calls the request's
safe_callback method if it's defined.
So this means that this cleanup activity gets called twice in this
case, which is erroneous (and in fact leads to a crash).
Fix this by just letting the osd client handle the cleanup in
the event of an interrupt.
This resolves one problem mentioned in:
http://tracker.ceph.com/issues/4706
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Yan, Zheng <zheng.z.yan@intel.com>
Yan, Zheng [Sun, 7 Apr 2013 08:28:49 +0000 (16:28 +0800)]
ceph: fix symlink inode operations
add getattr/setattr and xattrs related methods.
Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
Reviewed-by: Greg Farnum <greg@inktank.com>
Sam Lang [Tue, 9 Apr 2013 21:49:11 +0000 (16:49 -0500)]
ceph: Use pseudo-random numbers to choose mds
We don't need to use up entropy to choose an mds,
so use prandom_u32() to get a pseudo-random number.
Also, we don't need to choose a random mds if only
one mds is available, so add special casing for the
common case.
Fixes http://tracker.ceph.com/issues/3579
Signed-off-by: Sam Lang <sam.lang@inktank.com>
Reviewed-by: Greg Farnum <greg@inktank.com>
Reviewed-by: Alex Elder <elder@inktank.com>
Alex Elder [Thu, 24 Jan 2013 22:13:36 +0000 (16:13 -0600)]
rbd: implement layered reads
Implement layered read requests for format 2 rbd images.
If an rbd image is a clone of a snapshot, the snapshot will be the
clone's "parent" image. When an object read request on a clone
comes back with ENOENT it indicates that the clone is not yet
populated with that portion of the image's data, and the parent
image should be consulted to satisfy the read.
When this occurs, a new image request is created, directed to the
parent image. The offset and length of the image are the same as
the image-relative offset and length of the object request that
produced ENOENT. Data from the parent image therefore satisfies the
object read request for the original image request.
While this code works, it will not be active until we enable the
layering feature (by adding RBD_FEATURE_LAYERING to the value of
RBD_FEATURES_SUPPORTED).
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Wed, 31 Oct 2012 00:40:33 +0000 (19:40 -0500)]
rbd: probe the parent of an image if present
Call the probe function for the parent device if one is present.
Since we don't formally support the layering feature we won't
be using this functionality just yet.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Mon, 11 Feb 2013 18:33:24 +0000 (12:33 -0600)]
rbd: add an object request flag for image data objects
Add a flag to distinguish between object requests being done on
standalone objects and requests being sent for objects representing
rbd image data (i.e., object requests that are the result of image
request).
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Mon, 11 Feb 2013 18:33:24 +0000 (12:33 -0600)]
rbd: define an rbd object request flags field
We're going to need some more Boolean values for object requests,
so create a flags bit field and use it to record whether the request
is done.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 8 Feb 2013 15:55:49 +0000 (09:55 -0600)]
rbd: encapsulate image object end request handling
Encapsulate the code that completes processing of an object request
that's part of an image request.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Thu, 24 Jan 2013 22:13:36 +0000 (16:13 -0600)]
rbd: define image request layered flag
Define a flag indicating whether an image request is for a layered
image (one with a parent image to which requests will be redirected
if the target object of a request does not exist). The code that
checks this flag will be added shortly.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Thu, 24 Jan 2013 22:13:36 +0000 (16:13 -0600)]
rbd: define image request originator flag
Define a flag indicating whether an image request originated from
the Linux block layer (from blk_fetch_request()) or whether it was
initiated in order to satisfy an object request for a child image
of a layered rbd device. For image requests initiated by objects of
child images we'll save a pointer to the object request rather than
the Linux block request.
For now, only block requests are used.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 8 Feb 2013 15:55:49 +0000 (09:55 -0600)]
rbd: define image request flags
There are several Boolean values we'll be maintaining for image
requests. Switch from the single write_request field to a
general-purpose flags field, and use one if its bits to represent
the direction of I/O for the image request. Define helper functions
for setting and testing that flag.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Thu, 24 Jan 2013 22:13:36 +0000 (16:13 -0600)]
rbd: record image-relative offset in object requests
For an image object request we will need to know what offset within
the rbd image the request covers. Record that when the object
request gets created.
Update the I/O error warnings so they use this so what's reported
is more informative.
Rename a local variable to fit the convention used everywhere else.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Wed, 10 Apr 2013 17:34:25 +0000 (12:34 -0500)]
rbd: record aggregate image transfer count
Compute the total number of bytes transferred for an image
request--the sum across each of the request's object requests.
To avoid contention do it only when all object requests are
complete, in rbd_img_request_complete().
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Thu, 24 Jan 2013 22:13:36 +0000 (16:13 -0600)]
rbd: record overall image request result
If any image object request produces a non-zero result, preserve
that as the result of the overall image request. If multiple
objects have non-zero results, save only the first one.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Thu, 11 Apr 2013 14:29:48 +0000 (09:29 -0500)]
rbd: update feature bits
There is a new rbd feature bit defined for "fancy striping." Add
it to the ones defined in the kernel client.
Change RBD_FEATURES_ALL so it represents the set of all feature
bits (rather than just the ones we support). Define a new symbol
RBD_FEATURES_SUPPORTED to indicate the supported ones.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 5 Apr 2013 19:46:02 +0000 (14:46 -0500)]
libceph: make method call data be a separate data item
Right now the data for a method call is specified via a pointer and
length, and it's copied--along with the class and method name--into
a pagelist data item to be sent to the osd. Instead, encode the
data in a data item separate from the class and method names.
This will allow large amounts of data to be supplied to methods
without copying. Only rbd uses the class functionality right now,
and when it really needs this it will probably need to use a page
array rather than a page list. But this simple implementation
demonstrates the functionality on the osd client, and that's enough
for now.
This resolves:
http://tracker.ceph.com/issues/4104
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 5 Apr 2013 19:46:01 +0000 (14:46 -0500)]
libceph: add, don't set data for a message
Change the names of the functions that put data on a pagelist to
reflect that we're adding to whatever's already there rather than
just setting it to the one thing. Currently only one data item is
ever added to a message, but that's about to change.
This resolves:
http://tracker.ceph.com/issues/2770
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 5 Apr 2013 19:46:01 +0000 (14:46 -0500)]
libceph: implement multiple data items in a message
This patch adds support to the messenger for more than one data item
in its data list.
A message data cursor has two more fields to support this:
- a count of the number of bytes left to be consumed across
all data items in the list, "total_resid"
- a pointer to the head of the list (for validation only)
The cursor initialization routine has been split into two parts: the
outer one, which initializes the cursor for traversing the entire
list of data items; and the inner one, which initializes the cursor
to start processing a single data item.
When a message cursor is first initialized, the outer initialization
routine sets total_resid to the length provided. The data pointer
is initialized to the first data item on the list. From there, the
inner initialization routine finishes by setting up to process the
data item the cursor points to.
Advancing the cursor consumes bytes in total_resid. If the resid
field reaches zero, it means the current data item is fully
consumed. If total_resid indicates there is more data, the cursor
is advanced to point to the next data item, and then the inner
initialization routine prepares for using that. (A check is made at
this point to make sure we don't wrap around the front of the list.)
The type-specific init routines are modified so they can be given a
length that's larger than what the data item can support. The resid
field is initialized to the smaller of the provided length and the
length of the entire data item.
When total_resid reaches zero, we're done.
This resolves:
http://tracker.ceph.com/issues/3761
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Thu, 14 Mar 2013 19:09:06 +0000 (14:09 -0500)]
libceph: replace message data pointer with list
In place of the message data pointer, use a list head which links
through message data items. For now we only support a single entry
on that list.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Thu, 14 Mar 2013 19:09:06 +0000 (14:09 -0500)]
libceph: have cursor point to data
Rather than having a ceph message data item point to the cursor it's
associated with, have the cursor point to a data item. This will
allow a message cursor to be used for more than one data item.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Thu, 14 Mar 2013 19:09:06 +0000 (14:09 -0500)]
libceph: move cursor into message
A message will only be processing a single data item at a time, so
there's no need for each data item to have its own cursor.
Move the cursor embedded in the message data structure into the
message itself. To minimize the impact, keep the data->cursor
field, but make it be a pointer to the cursor in the message.
Move the definition of ceph_msg_data above ceph_msg_data_cursor so
the cursor can point to the data without a forward definition rather
than vice-versa.
This and the upcoming patches are part of:
http://tracker.ceph.com/issues/3761
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 5 Apr 2013 19:46:01 +0000 (14:46 -0500)]
libceph: record bio length
The bio is the only data item type that doesn't record its full
length. Fix that.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 5 Apr 2013 19:46:01 +0000 (14:46 -0500)]
libceph: skip message if too big to receive
We know the length of our message buffers. If we get a message
that's too long, just dump it and ignore it. If skip was set
then con->in_msg won't be valid, so be careful not to dereference
a null pointer in the process.
This resolves:
http://tracker.ceph.com/issues/4664
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 5 Apr 2013 19:46:01 +0000 (14:46 -0500)]
libceph: fix possible CONFIG_BLOCK build problem
This patch:
15a0d7b libceph: record message data length
did not enclose some bio-specific code inside CONFIG_BLOCK as
it should have. Fix that.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 5 Apr 2013 06:27:12 +0000 (01:27 -0500)]
libceph: kill off osd request r_data_in and r_data_out
Finally! Convert the osd op data pointers into real structures, and
make the switch over to using them instead of having all ops share
the in and/or out data structures in the osd request.
Set up a new function to traverse the set of ops and release any
data associated with them (pages).
This and the patches leading up to it resolve:
http://tracker.ceph.com/issues/4657
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 5 Apr 2013 06:27:12 +0000 (01:27 -0500)]
libceph: set the data pointers when encoding ops
Still using the osd request r_data_in and r_data_out pointer, but
we're basically only referring to it via the data pointers in the
osd ops. And we're transferring that information to the request
or reply message only when the op indicates it's needed, in
osd_req_encode_op().
To avoid a forward reference, ceph_osdc_msg_data_set() was moved up
in the file.
Don't bother calling ceph_osd_data_init(), in ceph_osd_alloc(),
because the ops array will already be zeroed anyway.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 5 Apr 2013 06:27:12 +0000 (01:27 -0500)]
libceph: combine initializing and setting osd data
This ends up being a rather large patch but what it's doing is
somewhat straightforward.
Basically, this is replacing two calls with one. The first of the
two calls is initializing a struct ceph_osd_data with data (either a
page array, a page list, or a bio list); the second is setting an
osd request op so it associates that data with one of the op's
parameters. In place of those two will be a single function that
initializes the op directly.
That means we sort of fan out a set of the needed functions:
- extent ops with pages data
- extent ops with pagelist data
- extent ops with bio list data
and
- class ops with page data for receiving a response
We also have define another one, but it's only used internally:
- class ops with pagelist data for request parameters
Note that we *still* haven't gotten rid of the osd request's
r_data_in and r_data_out fields. All the osd ops refer to them for
their data. For now, these data fields are pointers assigned to the
appropriate r_data_* field when these new functions are called.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 5 Apr 2013 06:27:12 +0000 (01:27 -0500)]
libceph: set message data when building osd request
All calls of ceph_osdc_start_request() are preceded (in the case of
rbd, almost) immediately by a call to ceph_osdc_build_request().
Move the build calls at the top of ceph_osdc_start_request() out of
there and into the ceph_osdc_build_request(). Nothing prevents
moving these calls to the top of ceph_osdc_build_request(), either
(and we're going to want them there in the next patch) so put them
at the top.
This and the next patch are related to:
http://tracker.ceph.com/issues/4657
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 5 Apr 2013 06:27:12 +0000 (01:27 -0500)]
libceph: move ceph_osdc_build_request()
This simply moves ceph_osdc_build_request() later in its source
file without any change. Done as a separate patch to facilitate
review of the change in the next patch.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 5 Apr 2013 06:27:12 +0000 (01:27 -0500)]
libceph: format class info at init time
An object class method is formatted using a pagelist which contains
the class name, the method name, and the data concatenated into an
osd request's outbound data.
Currently when a class op is initialized in osd_req_op_cls_init(),
the lengths of and pointers to these three items are recorded.
Later, when the op is getting formatted into the request message, a
new pagelist is created and that is when these items get copied into
the pagelist.
This patch makes it so the pagelist to hold these items is created
when the op is initialized instead.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 5 Apr 2013 06:27:12 +0000 (01:27 -0500)]
rbd: rearrange some code for consistency
This patch just trivially moves around some code for consistency.
In preparation for initializing osd request data fields in
ceph_osdc_build_request(), I wanted to verify that rbd did in fact
call that immediately before it called ceph_osdc_start_request().
It was true (although image requests are built in a group and then
started as a group). But I made the changes here just to make
it more obvious, by making all of the calls follow a common
sequence:
osd_req_op_<optype>_init();
ceph_osd_data_<type>_init()
osd_req_op_<optype>_<datafield>()
rbd_osd_req_format()
...
ret = rbd_obj_request_submit()
I moved the initialization of the callback for image object requests
into rbd_img_request_fill_bio(), again, for consistency. To avoid
a forward reference, I moved the definition of rbd_img_obj_callback()
up in the file.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 5 Apr 2013 06:27:12 +0000 (01:27 -0500)]
rbd: separate initialization of osd data
The osd data for a request is currently initialized inside
rbd_osd_req_create(), but that assumes an object request's data
belongs in the osd request's data in or data out field.
There are only three places where requests with data are set up, and
it turns out it's easier to call just the osd data init routines
directly there rather than handling it in rbd_osd_req_create().
(The real motivation here is moving toward getting rid of the
osd request in and out data fields.)
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 5 Apr 2013 06:27:12 +0000 (01:27 -0500)]
rbd: don't set data in rbd_osd_req_format_op()
Currently an object request has its osd request's data field set in
rbd_osd_req_format_op(). That assumes a single osd op per object
request, and that won't be the case for long.
Move the code that sets this out and into the caller.
Rename rbd_osd_req_format_op() to be just rbd_osd_req_format(),
removing the notion that it's doing anything op-specific.
This and the next patch resolve:
http://tracker.ceph.com/issues/4658
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 5 Apr 2013 06:27:11 +0000 (01:27 -0500)]
libceph: specify osd op by index in request
An osd request now holds all of its source op structures, and every
place that initializes one of these is in fact initializing one
of the entries in the the osd request's array.
So rather than supplying the address of the op to initialize, have
caller specify the osd request and an indication of which op it
would like to initialize. This better hides the details the
op structure (and faciltates moving the data pointers they use).
Since osd_req_op_init() is a common routine, and it's not used
outside the osd client code, give it static scope. Also make
it return the address of the specified op (so all the other
init routines don't have to repeat that code).
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Wed, 3 Apr 2013 06:28:58 +0000 (01:28 -0500)]
libceph: add data pointers in osd op structures
An extent type osd operation currently implies that there will
be corresponding data supplied in the data portion of the request
(for write) or response (for read) message. Similarly, an osd class
method operation implies a data item will be supplied to receive
the response data from the operation.
Add a ceph_osd_data pointer to each of those structures, and assign
it to point to eithre the incoming or the outgoing data structure in
the osd message. The data is not always available when an op is
initially set up, so add two new functions to allow setting them
after the op has been initialized.
Begin to make use of the data item pointer available in the osd
operation rather than the request data in or out structure in
places where it's convenient. Add some assertions to verify
pointers are always set the way they're expected to be.
This is a sort of stepping stone toward really moving the data
into the osd request ops, to allow for some validation before
making that jump.
This is the first in a series of patches that resolve:
http://tracker.ceph.com/issues/4657
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Wed, 3 Apr 2013 06:28:58 +0000 (01:28 -0500)]
libceph: rename data out field in osd request op
There are fields "indata" and "indata_len" defined the ceph osd
request op structure. The "in" part is with from the point of view
of the osd server, but is a little confusing here on the client
side. Change their names to use "request" instead of "in" to
indicate that it defines data provided with the request (as opposed
the data returned in the response).
Rename the local variable in osd_req_encode_op() to match.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Thu, 4 Apr 2013 02:32:51 +0000 (21:32 -0500)]
libceph: keep source rather than message osd op array
An osd request keeps a pointer to the osd operations (ops) array
that it builds in its request message.
In order to allow each op in the array to have its own distinct
data, we will need to keep track of each op's data, and that
information does not go over the wire.
As long as we're tracking the data we might as well just track the
entire (source) op definition for each of the ops. And if we're
doing that, we'll have no more need to keep a pointer to the
wire-encoded version.
This patch makes the array of source ops be kept with the osd
request structure, and uses that instead of the version encoded in
the message in places where that was previously used. The array
will be embedded in the request structure, and the maximum number of
ops we ever actually use is currently 2. So reduce CEPH_OSD_MAX_OP
to 2 to reduce the size of the structure.
The result of doing this sort of ripples back up, and as a result
various function parameters and local variables become unnecessary.
Make r_num_ops be unsigned, and move the definition of struct
ceph_osd_req_op earlier to ensure it's defined where needed.
It does not yet add per-op data, that's coming soon.
This resolves:
http://tracker.ceph.com/issues/4656
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Thu, 4 Apr 2013 02:32:51 +0000 (21:32 -0500)]
rbd: define rbd_osd_req_format_op()
Define rbd_osd_req_format_op(), which encapsulates formatting
an osd op into an object request's osd request message. Only
one op is supported right now.
Stop calling ceph_osdc_build_request() in rbd_osd_req_create().
Instead, call rbd_osd_req_format_op() in each of the callers of
rbd_osd_req_create().
This is to prepare for the next patch, in which the source ops for
an osd request will be held in the osd request itself. Because of
that, we won't have the source op to work with until after the
request is created, so we can't format the op until then.
This an the next patch resolve:
http://tracker.ceph.com/issues/4656
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Wed, 3 Apr 2013 06:28:58 +0000 (01:28 -0500)]
libceph: a few more osd data cleanups
These are very small changes that make use osd_data local pointers
as shorthands for structures being operated on.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Wed, 3 Apr 2013 06:28:58 +0000 (01:28 -0500)]
libceph: define ceph_osd_data_length()
One more osd data helper, which returns the length of the
data item, regardless of its type.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Wed, 3 Apr 2013 06:28:57 +0000 (01:28 -0500)]
libceph: define a few more helpers
Define ceph_osd_data_init() and ceph_osd_data_release() to clean up
a little code.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Wed, 3 Apr 2013 06:28:57 +0000 (01:28 -0500)]
libceph: define osd data initialization helpers
Define and use functions that encapsulate the initializion of a
ceph_osd_data structure.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Wed, 3 Apr 2013 06:28:57 +0000 (01:28 -0500)]
libceph: compute incoming bytes once
This is a simple change, extracting the number of incoming data
bytes just once in handle_reply().
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Alex Elder [Fri, 5 Apr 2013 06:27:11 +0000 (01:27 -0500)]
rbd: define inbound data size for method ops
When rbd creates an object request containing an object method call
operation it is passing 0 for the size. I originally thought this
was because the length was not needed for method calls, but I think
it really should be supplied, to describe how much space is
available to receive response data. So provide the supplied length.
This resolves:
http://tracker.ceph.com/issues/4659
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>