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Use bsearch(3) to make snapshot lookup by id more efficient. (There
could be thousands of snapshots, and conceivably many more.)
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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This functionality inadvertently disappeared in the last patch.
Image snapshots can get removed at just about any time. In
particular it can disappear even if it is in use by an rbd
client as a mapped image.
The rbd client deals with such a disappearance by responding to new
requests with ENXIO. This is implemented by each rbd device
maintaining an EXISTS flag, which is normally set but cleared if a
snapshot disappears.
This patch (re-)implements the clearing of that flag.
Whenever mapped image header information is refreshed, if the
mapping is for a snapshot, verify the mapped snapshot is still
present in the updated snapshot context. If it is not, clear the
flag.
It is not necessary to check this in the initial probe, because the
probe will not succeed if the snapshot doesn't exist.
This resolves:
http://tracker.ceph.com/issues/4880
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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We no longer use the snapshot list for anything. When we need to
look up a snapshot name, id, size, or feature mask, we just do it
directly rather than relying on this list being updated with every
refresh. The main reason it existed was for the benefit of the
device/sysfs entries that previously were associated with snapshots.
So get rid of the snapshot list, and struct rbd_snap, and the
hundreds of lines of code that supported them.
This resolves:
http://tracker.ceph.com/issues/4868
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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This patch defines a handful of new functions that will allow
us to get rid of the rbd device structure's list of snapshots.
Define rbd_snap_id_by_name() to look up a snapshot id given its
name. This is efficient for format 1 images but not for format 2.
Fortunately it only gets called at mapping time so it's not that
critical.
Use rbd_snap_id_by_name() to find out the id for a snapshot getting
mapped, and pass that id to new functions rbd_snap_size() and
rbd_snap_features() to look up information about a given snapshot's
size and feature mask given its snapshot id. All this gets done
in rbd_dev_mapping_set().
As a result, snap_by_name() is no longer needed, so get rid of it.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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In order to align with what was needed for format 1 rbd images,
rbd_dev_v2_snap_info() was set up to take as argument an index into
the array of snapshot ids in a rbd device's snapshot context.
This switches that around, so we pass the snapshot id instead.
In doing this, rbd_snap_name() now returns a dynamically-allocated
string rather than a fixed one, so there's no need to make a
duplicate in its caller, rbd_dev_spec_update().
This means the following functions take a snapshot id where they
previously used an index value:
rbd_dev_snap_info()
rbd_dev_v1_snap_info()
rbd_dev_v2_snap_info()
A new function, rbd_dev_snap_index(), determines the snap index for
format 1 images and uses it to look up the name.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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Rather than scanning the list of snapshot structures for it, scan
the snapshot context buffer containing snapshot names in order to
determine for a format 1 image the name associated with a given
snapshot id.
Pull out the part of rbd_dev_v1_snap_info() that does this scan into
a new function, _rbd_dev_v1_snap_name(). Have that function return
a dynamically-allocated copy of the name, and don't duplicate it in
rbd_dev_v1_snap_info().
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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Nothing ever uses the version field maintained in the object request
structure any more, so get rid of it.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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Only NULL is passed as the version argument to rbd_obj_method_sync(),
so get rid of it.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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Continued from the last patch, more parameters that can go away
because we no longer have a need to track object versions.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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Several functions in rbd have parameters meant to allow the version
of an object to be passed in or out. The purpose of those was to
allow the version of a header object to be maintained, but we no
longer do that. As a result, these parameters are never actually
needed or used, so get rid of them.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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The rbd code takes care to maintain the version of the header
object. This was done in hopes of using it to detect a change in
the object between reading it and setting up a watch request to
be notified of changes.
The mechanism was never fully implemented, however. And we now
avoid the original problem by setting up the watch request before
ever reading the content of the header.
The osd doesn't interpret the object version supplied with a WATCH
osd op, nor does it use the version supplied with a NOTIFY_ACK op
(we can just supply 0 for both). There is therefore no need to
maintain the header's object version any more, so stop doing so.
We'll be able to simplify some more rbd code in the next few patches
as a result of this.
This resolves:
http://tracker.ceph.com/issues/3952
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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Make explicit that snapshot names don't change by making functions
return and take parameters that that point to const qualified data.
This resolves:
http://tracker.ceph.com/issues/4867
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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Whenever a header object event causes a mapped rbd image to refresh
its header information, revalidate_disk() is being called. This was
done in rbd_dev_refresh() outside the control mutex in order to
avoid a lock inversion. Although a an event like this *might*
indicate the image has changed size, most of the time it does not.
Record the image size before and after the refresh, and only
call revalidate_disk() if it changes.
This resolves:
http://tracker.ceph.com/issues/4867
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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A warning gets spewed for any image being probed, including parent
images. Set up a condition such that the warning message only gets
printed for the image being mapped, not any of its parents.
Also, I didn't like the way the warning ended up being so long.
Make it a terse warning instead. People experimenting with layering
will know what the message means.
This is part of:
http://tracker.ceph.com/issues/4867
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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Now that we have a library routine to create snap contexts, use it.
This is part of:
http://tracker.ceph.com/issues/4857
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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Stop setting up Linux devices during the image probe operation.
Instead, set up the devices as a separate step after the image
probe, in rbd_add().
A consequence of this is that only mapped images get devices
assigned to them, which is pretty sweet.
This resolves:
http://tracker.ceph.com/issues/4774
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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Currently an rbd_device structure gets destroyed from the release
routine for the device embedded within it. Stop doing that, instead
calling rbd_dev_image_release() right after rbd_bus_del_dev()
wherever the latter is called.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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Define a new function rbd_dev_unprobe() which undoes state changes
that occur from calling rbd_dev_v1_probe() or rbd_dev_v2_probe().
Note that this is a superset of rbd_header_free(), which is now
getting removed (it seems to have been used improperly anyway).
Flesh out rbd_dev_image_release() so it undoes exactly what
rbd_dev_image_probe() does.
This means that:
- rbd_dev_device_release() gets called when the last device
reference gets dropped;
- that undoes everything done by the rbd_dev_device_setup() call
at the end of rbd_dev_image_probe() (and nothing more), ending
by calling rbd_dev_image_release(); and
- rbd_dev_image_release() undoes everything else done by
rbd_dev_image_probe() (and this includes a call to
rbd_dev_unprobe().
This means the image and device portions of an rbd device are fairly
cleanly separated now, so error paths should be a little easier to
verify than they used to be.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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Rename rbd_dev_probe_finish() to be rbd_dev_device_setup(). Its
purpose is to set up the Linux side of an rbd device mapping.
Rename rbd_dev_release() to be rbd_dev_device_release(), making
it more obvious it serves as the inverse of the setup function
(or it will).
Encapsulate some of what was done in rbd_dev_release() into a new
function rbd_dev_image_release(), which serves as the inverse of
setting up the ceph side of the mapped rbd image.
Define a new helper rbd_dev_clear_mapping() to simply zero out the
fields of a mapping structure--the inverse of rbd_dev_set_mapping().
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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Drop the module reference at the end of rbd_remove() for symmetry
with adding a reference at the top of rbd_add().
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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Move setting up the watch request for an image so it's done in
rbd_dev_image_probe() rather than rbd_dev_probe_finish(). Move
it all the way up to before doing the initial probe. This avoids
a potential race condition, in which we get (and use) the initial
snapshot context for an image, and it gets changed between that
time and the time we get the watch set up.
This resolves:
http://tracker.ceph.com/issues/3871
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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When a format 2 image is refreshed, code is in place to verify that
the object order never changes from what it was originally. This
relies on the fact that the refresh will occur *after* an initial
load of information about the image.
An upcoming patch makes it possible for the refresh to occur first,
so we can no longer make this order check. The order really can't
ever change anyway--this was just a sanity check. So get rid of it.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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Currently, a watch on an rbd device header object gets torn down
when its final Linux device reference gets dropped. Instead, tear
it down when removing the device. If an error occurs cleaning up
the watch event when unmapping, abort the unmap request.
All images (including parents) still get watch requests set up, so
tear these down also, in rbd_dev_remove_parent(). For now, ignore
any errors that occur in this case.
Get rid of local variable "rc" in rbd_remove(); use "ret" instead
(they both somehow ended up defined in the function and only one is
needed).
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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Define a new function rbd_header_name(), which allocates and formats
the name of the header object for the rbd device.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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Move a block of initialization related to the "ceph-side" of an rbd
image out of rbd_dev_probe_finish() and into rbd_dev_image_probe().
Add appropriate error handling to clean things up in the event any
of these new functions return an error.
We know that rbd_dev_snaps_update(), rbd_dev_spec_update(), and
rbd_dev_probe_parent() all clean up after themselves before they
return an error, so no special cleanup is required except when an
earlier call succeeds. Since rbd_dev_spec_update() only updates the
spec field (whose cleanup will be handled by dropping the last
reference to the spec) there is no cleanup action associatied with
that.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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Probe for a parent device earlier in rbd_dev_probe_finish(), before
starting to set up the Linux side of the rbd device.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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When an error occurs while finishing probing a device it is assumed
that parent devices get cleaned up when deleting a device. They
don't. Add a call to clean them up. Note that this means the
parent spec will already be cleaned up so it doesn't have to be
in one of the rbd_add() error paths.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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In certain error paths, it is possible for an rbd device to have a
parent spec but no parent rbd_dev. In rbd_dev_remove_parent() use
the parent field rather than parent_spec in determining whether to
try to remove any parent devices. Use assertions to indicate that
any non-null parent pointer has parent_spec associated with it.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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The function __rbd_remove() is used in two spots, and it's fairly
simple. It combines cleanup of part of the ceph-side state as well
as cleaning up the Linux-side state. Just open code it in the two
callers and eliminate the function.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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