An open request for a mapped rbd image can arrive while removal of
that mapping is underway. We need to prevent such an open request
from succeeding. (It appears that Maciej Galkiewicz ran into this
problem.)
Define and use a "removing" flag to indicate a mapping is getting
removed. Set it in the remove path after verifying nothing holds
the device open. And check it in the open path before allowing the
open to proceed. Acquire the rbd device's lock around each of these
spots to avoid any races accessing the flags and open_count fields.
This addresses:
http://tracker.newdream.net/issues/3427
Reported-by: Maciej Galkiewicz <maciejgalkiewicz@ragnarson.com>
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Define a new rbd device flags field, manipulated using bit
operations. Replace the use of the current "exists" flag with a bit
in this new "flags" field. Add a little commentary about the
"exists" flag, which does not need to be manipulated atomically.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
When we register an osd request to linger, it means that request
will stay around (under control of the osd client) until we've
unregistered it. We do that for an rbd image's header object, and
we keep a pointer to the object request associated with it.
Keep a reference to the watch object request for as long as it is
registered to linger. Drop it again after we've removed the linger
registration.
This resolves:
http://tracker.ceph.com/issues/3937
(Note: this originally came about because the osd client was
issuing a callback more than once. But that behavior will be
changing soon, documented in tracker issue 3967.)
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Decrement the obj_request_count value when deleting an object
request from its image request's list. Rearrange a few lines
in the surrounding code.
This resolves:
http://tracker.ceph.com/issues/3940
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Switch to keeping track of the object request pointer rather than
the osd request used to watch the rbd image header object.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Move the code that unregisters an rbd device's lingering header
object watch request into rbd_dev_header_watch_sync(), so it
occurs in the same function that originally sets up that request.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Get rid rbd_req_sync_exec() because it is no longer used. That
eliminates the last use of rbd_req_sync_op(), so get rid of that
too. And finally, that leaves rbd_do_request() unreferenced, so get
rid of that.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Reimplement synchronous object method calls using the new request
tracking code. Use the name rbd_obj_method_sync()
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
When we receive notification of a change to an rbd image's header
object we need to refresh our information about the image (its
size and snapshot context). Once we have refreshed our rbd image
we need to acknowledge the notification.
This acknowledgement was previously done synchronously, but there's
really no need to wait for it to complete.
Change it so the caller doesn't wait for the notify acknowledgement
request to complete. And change the name to reflect it's no longer
synchronous.
This resolves:
http://tracker.newdream.net/issues/3877
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Get rid rbd_req_sync_notify_ack() because it is no longer used.
As a result rbd_simple_req_cb() becomes unreferenced, so get rid
of that too.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Use the new object request tracking mechanism for handling a
notify_ack request.
Move the callback function below the definition of this so we don't
have to do a pre-declaration.
This resolves:
http://tracker.newdream.net/issues/3754
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Get rid of rbd_req_sync_watch(), because it is no longer used.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Implement a new function to set up or tear down a watch event
for an mapped rbd image header using the new request code.
Create a new object request type "nodata" to handle this. And
define rbd_osd_trivial_callback() which simply marks a request done.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Delete rbd_req_sync_read() is no longer used, so get rid of it.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Reimplement the synchronous read operation used for reading a
version 1 header using the new request tracking code. Name the
resulting function rbd_obj_read_sync() to better reflect that
it's a full object operation, not an object request. To do this,
implement a new OBJ_REQUEST_PAGES object request type.
This implements a new mechanism to allow the caller to wait for
completion for an rbd_obj_request by calling rbd_obj_request_wait().
This partially resolves:
http://tracker.newdream.net/issues/3755
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
The two remaining callers of rbd_do_request() always pass a null
collection pointer, so the "coll" and "coll_index" parameters are
not needed. There is no other use of that data structure, so it
can be eliminated.
Deleting them means there is no need to allocate a rbd_request
structure for the callback function. And since that's the only use
of *that* structure, it too can be eliminated.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Now that the request function has been replaced by one using the new
request management data structures the old one can go away.
Deleting it makes rbd_dev_do_request() no longer needed, and
deleting that makes other functions unneeded, and so on.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
This patch fully implements the new request tracking code for rbd
I/O requests.
Each I/O request to an rbd image will get an rbd_image_request
structure allocated to track it. This provides access to all
information about the original request, as well as access to the
set of one or more object requests that are initiated as a result
of the image request.
An rbd_obj_request structure defines a request sent to a single osd
object (possibly) as part of an rbd image request. An rbd object
request refers to a ceph_osd_request structure built up to represent
the request; for now it will contain a single osd operation. It
also provides space to hold the result status and the version of the
object when the osd request completes.
An rbd_obj_request structure can also stand on its own. This will
be used for reading the version 1 header object, for issuing
acknowledgements to event notifications, and for making object
method calls.
All rbd object requests now complete asynchronously with respect
to the osd client--they supply a common callback routine.
This resolves:
http://tracker.newdream.net/issues/3741
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
It doesn't seem this spinlock was properly initialized.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Finn Thain <fthain@telegraphics.com.au>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
kbuild test robot says:
tree: git://git.kernel.dk/linux-block.git for-3.9/drivers
head: 1262e24a59
commit: 8722ff8cdb [6/8] block: IBM RamSan 70/80 device driver
config: make ARCH=alpha allyesconfig
All error/warnings:
drivers/block/rsxx/dma.c: In function 'rsxx_complete_dma':
>> drivers/block/rsxx/dma.c:251:2: error: implicit declaration of function 'kmem_cache_free' [-Werror=implicit-function-declaration]
drivers/block/rsxx/dma.c: In function 'rsxx_queue_discard':
>> drivers/block/rsxx/dma.c:567:2: error: implicit declaration of function 'kmem_cache_alloc' [-Werror=implicit-function-declaration]
>> drivers/block/rsxx/dma.c:567:6: warning: assignment makes pointer from integer without a cast [enabled by default]
drivers/block/rsxx/dma.c: In function 'rsxx_queue_dma':
>> drivers/block/rsxx/dma.c:601:6: warning: assignment makes pointer from integer without a cast [enabled by default]
drivers/block/rsxx/dma.c: In function 'rsxx_dma_init':
>> drivers/block/rsxx/dma.c:985:2: error: implicit declaration of function 'KMEM_CACHE' [-Werror=implicit-function-declaration]
>> drivers/block/rsxx/dma.c:985:29: error: 'rsxx_dma' undeclared (first use in this function)
drivers/block/rsxx/dma.c:985:29: note: each undeclared identifier is reported only once for each function it appears in
>> drivers/block/rsxx/dma.c:985:39: error: 'SLAB_HWCACHE_ALIGN' undeclared (first use in this function)
drivers/block/rsxx/dma.c: In function 'rsxx_dma_cleanup':
>> drivers/block/rsxx/dma.c:995:2: error: implicit declaration of function 'kmem_cache_destroy' [-Werror=implicit-function-declaration]
cc1: some warnings being treated as errors
Signed-off-by: Jens Axboe <axboe@kernel.dk>
The MTIP32XX driver calls devm_request_irq() and therefore needs a
GENERIC_HARDIRQS dependency to prevent building it on s390.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Pull block layer updates from Jens Axboe:
"I've got a few bits pending for 3.8 final, that I better get sent out.
It's all been sitting for a while, I consider it safe.
It contains:
- Two bug fixes for mtip32xx, fixing a driver hang and a crash.
- A few-liner protocol error fix for drbd.
- A few fixes for the xen block front/back driver, fixing a potential
data corruption issue.
- A race fix for disk_clear_events(), causing spurious warnings. Out
of the Chrome OS base.
- A deadlock fix for disk_clear_events(), moving it to the a
unfreezable workqueue. Also from the Chrome OS base."
* 'for-linus' of git://git.kernel.dk/linux-block:
drbd: fix potential protocol error and resulting disconnect/reconnect
mtip32xx: fix for crash when the device surprise removed during rebuild
mtip32xx: fix for driver hang after a command timeout
block: prevent race/cleanup
block: remove deadlock in disk_clear_events
xen-blkfront: handle bvecs with partial data
llist/xen-blkfront: implement safe version of llist_for_each_entry
xen-blkback: implement safe iterator for the list of persistent grants
This patch includes the device driver for the IBM RamSan
family of PCI SSD flash storage cards. This driver will
include support for the RamSan 70 and 80. The driver
presents a block device for device I/O.
Signed-off-by: Philip J Kelleher <pjk1939@linux.vnet.ibm.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
When an rbd image is initially mapped a watch event is registered so
we can do something if the header object changes.
The code that does this currently loops if initiating the watch
request results in an ERANGE error. The osds will never return
ERANGE, so there's no reason to do this loop, so get rid of it.
This resolves:
http://tracker.newdream.net/issues/3860
Note that the problem this loop was intended to solve is a race
between collecting image header information and setting up the watch
on the header object. The real fix for that problem is described
here:
http://tracker.newdream.net/issues/3871
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
The return type of rbd_get_num_segments() is int, but the values it
operates on are u64. Although it's not likely, there's no guarantee
the result won't exceed what can be respresented in an int. The
function is already designed to return -ERANGE on error, so just add
this possible overflow as another reason to return that.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Dan Mick <dan.mick@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
A few very minor changes to the rbd code:
- RBD_MAX_OPT_LEN is unused, so get rid of it
- Consolidate rbd options definitions
- Make rbd_segment_name() return pointer to const char
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Dan Mick <dan.mick@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
The CONFIG_EXPERIMENTAL config item has not carried much meaning for a
while now and is almost always enabled by default. As agreed during the
Linux kernel summit, remove it from any "depends on" lines in Kconfigs.
CC: Tim Waugh <tim@cyberelk.net>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
When we notice a disk failure on the receiving side,
we stop sending it new incoming writes.
Depending on exact timing of various events, the same transfer log epoch
could end up containing both replicated (before we noticed the failure)
and local-only requests (after we noticed the failure).
The sanity checks in tl_release(), called when receiving a
P_BARRIER_ACK, check that the ack'ed transfer log epoch matches
the expected epoch, and the number of contained writes matches
the number of ack'ed writes.
In this case, they counted both replicated and local-only writes,
but the peer only acknowledges those it has seen. We get a mismatch,
resulting in a protocol error and disconnect/reconnect cycle.
Messages logged are
"BAD! BarrierAck #%u received with n_writes=%u, expected n_writes=%u!\n"
A similar issue can also be triggered when starting a resync while
having a healthy replication link, by invalidating one side, forcing a
full sync, or attaching to a diskless node.
Fix this by closing the current epoch if the state changes in a way
that would cause the replication intent of the next write.
Epochs now contain either only non-replicated,
or only replicated writes.
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
problem introduced recently by kvm id changes.
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Merge tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux
Pull module fixes and a virtio block fix from Rusty Russell:
"Various minor fixes, but a slightly more complex one to fix the
per-cpu overload problem introduced recently by kvm id changes."
* tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux:
module: put modules in list much earlier.
module: add new state MODULE_STATE_UNFORMED.
module: prevent warning when finit_module a 0 sized file
virtio-blk: Don't free ida when disk is in use
The type of the snap_id local variable is defined with the
wrong byte order. Fix that.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Both rbd_req_sync_op() and rbd_do_request() have a "linger"
parameter, which is the address of a pointer that should refer to
the osd request structure used to issue a request to an osd.
Only one case ever supplies a non-null "linger" argument: an
CEPH_OSD_OP_WATCH start. And in that one case it is assigned
&rbd_dev->watch_request.
Within rbd_do_request() (where the assignment ultimately gets made)
we know the rbd_dev and therefore its watch_request field. We
also know whether the op being sent is CEPH_OSD_OP_WATCH start.
Stop opaquely passing down the "linger" pointer, and instead just
assign the value directly inside rbd_do_request() when it's needed.
This makes it unnecessary for rbd_req_sync_watch() to make
arrangements to hold a value that's not available until a
bit later. This more clearly separates setting up a watch
request from submitting it.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
The two remaining osd ops used by rbd are CEPH_OSD_OP_WATCH and
CEPH_OSD_OP_NOTIFY_ACK. Move the setup of those operations into
rbd_osd_req_op_create(), and get rid of rbd_create_rw_op() and
rbd_destroy_op().
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Move the initialization of the CEPH_OSD_OP_CALL operation into
rbd_osd_req_op_create().
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Move the assignment of the extent offset and length and payload
length out of rbd_req_sync_op() and into its caller in the one spot
where a read (and note--no write) operation might be initiated.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
In rbd_do_request() there's a sort of last-minute assignment of the
extent offset and length and payload length for read and write
operations. Move those assignments into the caller (in those spots
that might initiate read or write operations)
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
When rbd_req_sync_notify_ack() calls rbd_do_request() it supplies
rbd_simple_req_cb() as its callback function. Because the callback
is supplied, an rbd_req structure gets allocated and populated so it
can be used by the callback. However rbd_simple_req_cb() is not
freeing (or even using) the rbd_req structure, so it's getting
leaked.
Since rbd_simple_req_cb() has no need for the rbd_req structure,
just avoid allocating one for this case. Of the three calls to
rbd_do_request(), only the one from rbd_do_op() needs the rbd_req
structure, and that call can be distinguished from the other two
because it supplies a non-null rbd_collection pointer.
So fix this leak by only allocating the rbd_req structure if a
non-null "coll" value is provided to rbd_do_request().
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
When rbd_do_request() is called it allocates and populates an
rbd_req structure to hold information about the osd request to be
sent. This is done for the benefit of the callback function (in
particular, rbd_req_cb()), which uses this in processing when
the request completes.
Synchronous requests provide no callback function, in which case
rbd_do_request() waits for the request to complete before returning.
This case is not handling the needed free of the rbd_req structure
like it should, so it is getting leaked.
Note however that the synchronous case has no need for the rbd_req
structure at all. So rather than simply freeing this structure for
synchronous requests, just don't allocate it to begin with.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
The rbd_req_sync_watch() and rbd_req_sync_unwatch() functions are
nearly identical. Combine them into a single function with a flag
indicating whether a watch is to be initiated or torn down.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Each osd message includes a layout structure, and for rbd it is
always the same (at least for osd's in a given pool).
Initialize a layout structure when an rbd_dev gets created and just
copy that into osd requests for the rbd image.
Replace an assertion that was done when initializing the layout
structures with code that catches and handles anything that would
trigger the assertion as soon as it is identified. This precludes
that (bad) condition from ever occurring.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
When rbd_do_request() has a request to process it initializes a ceph
file layout structure and uses it to compute offsets and limits for
the range of the request using ceph_calc_file_object_mapping().
The layout used is fixed, and is based on RBD_MAX_OBJ_ORDER (30).
It sets the layout's object size and stripe unit to be 1 GB (2^30),
and sets the stripe count to be 1.
The job of ceph_calc_file_object_mapping() is to determine which
of a sequence of objects will contain data covered by range, and
within that object, at what offset the range starts. It also
truncates the length of the range at the end of the selected object
if necessary.
This is needed for ceph fs, but for rbd it really serves no purpose.
It does its own blocking of images into objects, echo of which is
(1 << obj_order) in size, and as a result it ignores the "bno"
value returned by ceph_calc_file_object_mapping(). In addition,
by the point a request has reached this function, it is already
destined for a single rbd object, and its length will not exceed
that object's extent. Because of this, and because the mapping will
result in blocking up the range using an integer multiple of the
image's object order, ceph_calc_file_object_mapping() will never
change the offset or length values defined by the request.
In other words, this call is a big no-op for rbd data requests.
There is one exception. We read the header object using this
function, and in that case we will not have already limited the
request size. However, the header is a single object (not a file or
rbd image), and should not be broken into pieces anyway. So in fact
we should *not* be calling ceph_calc_file_object_mapping() when
operating on the header object.
So...
Don't call ceph_calc_file_object_mapping() in rbd_do_request(),
because useless for image data and incorrect to do sofor the image
header.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
This patch gets rid of rbd_calc_raw_layout() by simply open coding
it in its one caller.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
This is the first in a series of patches aimed at eliminating
the use of ceph_calc_raw_layout() by rbd.
It simply pulls in a copy of that function and renames it
rbd_calc_raw_layout().
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
We now know that every of rbd_req_sync_op() passes an array of
exactly one operation, as evidenced by all callers passing 1 as its
num_op argument. So get rid of that argument, assuming a single op.
Similarly, we now know that all callers of rbd_do_request() pass 1
as the num_op value, so that parameter can be eliminated as well.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Throughout the rbd code there are spots where it appears we can
handle an osd request containing more than one osd request op.
But that is only the way it appears. In fact, currently only one
operation at a time can be supported, and supporting more than
one will require much more than fleshing out the support that's
there now.
This patch changes names to make it perfectly clear that anywhere
we're dealing with a block of ops, we're in fact dealing with
exactly one of them. We'll be able to simplify some things as
a result.
When multiple op support is implemented, we can update things again
accordingly.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Both ceph_osdc_alloc_request() and ceph_osdc_build_request() are
provided an array of ceph osd request operations. Rather than just
passing the number of operations in the array, the caller is
required append an additional zeroed operation structure to signal
the end of the array.
All callers know the number of operations at the time these
functions are called, so drop the silly zero entry and supply that
number directly. As a result, get_num_ops() is no longer needed.
This also means that ceph_osdc_alloc_request() never uses its ops
argument, so that can be dropped.
Also rbd_create_rw_ops() no longer needs to add one to reserve room
for the additional op.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Add a num_op parameter to rbd_do_request() and rbd_req_sync_op() to
indicate the number of entries in the array. The callers of these
functions always know how many entries are in the array, so just
pass that information down.
This is in anticipation of eliminating the extra zero-filled entry
in these ops arrays.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Only one of the two callers of ceph_osdc_alloc_request() provides
page or bio data for its payload. And essentially all that function
was doing with those arguments was assigning them to fields in the
osd request structure.
Simplify ceph_osdc_alloc_request() by having the caller take care of
making those assignments
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
The only thing ceph_osdc_alloc_request() really does with the
flags value it is passed is assign it to the newly-created
osd request structure. Do that in the caller instead.
Both callers subsequently call ceph_osdc_build_request(), so have
that function (instead of ceph_osdc_alloc_request()) issue a warning
if a request comes through with neither the read nor write flags set.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
The osdc parameter to ceph_calc_raw_layout() is not used, so get rid
of it. Consequently, the corresponding parameter in calc_layout()
becomes unused, so get rid of that as well.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
A snapshot id must be provided to ceph_calc_raw_layout() even though
it is not needed at all for calculating the layout.
Where the snapshot id *is* needed is when building the request
message for an osd operation.
Drop the snapid parameter from ceph_calc_raw_layout() and pass
that value instead in ceph_osdc_build_request().
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
The len argument to ceph_osdc_build_request() is set up to be
passed by address, but that function never updates its value
so there's no need to do this. Tighten up the interface by
passing the length directly.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
For some reason, the snapid field of the osd request header is
explicitly set to CEPH_NOSNAP in rbd_do_request(). Just a few lines
later--with no code that would access this field in between--a call
is made to ceph_calc_raw_layout() passing the snapid provided to
rbd_do_request(), which encodes the snapid value it is provided into
that field instead.
In other words, there is no need to fill in CEPH_NOSNAP, and doing
so suggests it might be necessary. Don't do that any more.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
The snapc and snapid parameters to rbd_req_sync_op() always take
the values NULL and CEPH_NOSNAP, respectively. So just get rid
of them and use those values where needed.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
All callers of rbd_req_sync_exec() pass CEPH_OSD_FLAG_READ as their
flags argument. Delete that parameter and use CEPH_OSD_FLAG_READ
within the function. If we find a need to support write operations
we can add it back again.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
There is only one caller of rbd_req_sync_read(), and it passes
CEPH_NOSNAP as the snapshot id argument. Delete that parameter
and just use CEPH_NOSNAP within the function.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
The last two parameters to ceph_osd_build_request() describe the
object id, but the values passed always come from the osd request
structure whose address is also provided. Get rid of those last
two parameters.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Pull a block of code that initializes the layout structure in an osd
request into its own function so it can be reused.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Dan Mick <dan.mick@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Right now we get the snapshot context for an rbd image (under
protection of the header semaphore) for every request processed.
There's no need to get the snap context if we're doing a read,
so avoid doing so in that case.
Note that we no longer need to hold the header semaphore to
check the rbd_dev's existence flag.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
The rbd_device->exists field can be updated asynchronously, changing
from set to clear if a mapped snapshot disappears from the base
image's snapshot context.
Currently, value of the "exists" flag is only read and modified
under protection of the header semaphore, but that will change with
the next patch. Making it atomic ensures this won't be a problem
because the a the non-existence of device will be immediately known.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Now that a big hunk in the middle of rbd_rq_fn() has been moved
into its own routine we can simplify it a little more.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Only one of the three callers of rbd_do_request() provide a
collection structure to aggregate status.
If an error occurs in rbd_do_request(), have the caller
take care of calling rbd_coll_end_req() if necessary in
that one spot.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
In rbd_rq_fn(), requests are fetched from the block layer and each
request is processed, looping through the request's list of bio's
until they've all been consumed.
Separate the handling for a single request into its own function to
make it a bit easier to see what's going on.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
The result field in a ceph osd reply header is a signed 32-bit type,
but rbd code often casually uses int to represent it.
The following changes the types of variables that handle this result
value to be "s32" instead of "int" to be completely explicit about
it. Only at the point we pass that result to __blk_end_request()
does the type get converted to the plain old int defined for that
interface.
There is almost certainly no binary impact of this change, but I
prefer to show the exact size and signedness of the value since we
know it.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Dan Mick <dan.mick@inktank.com>
There are spots where a ceph_osds_request pointer variable is given
the name "req". Since we're dealing with (at least) three types of
requests (block layer, rbd, and osd), I find this slightly
distracting.
Change such instances to use "osd_req" consistently to make the
abstraction represented a little more obvious.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Dan Mick <dan.mick@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
There are two names used for items of rbd_request structure type:
"req" and "req_data". The former name is also used to represent
items of pointers to struct ceph_osd_request.
Change all variables that have these names so they are instead
called "rbd_req" consistently.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Dan Mick <dan.mick@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Josh suggested adding warnings to this function to help users
diagnose problems.
Other than memory allocatino errors, there are two places where
errors can be returned. Both represent problems that should
have been caught earlier, and as such might well have been
handled with BUG_ON() calls. But if either ever did manage to
happen, it will be reported.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Add a warning in bio_chain_clone_range() to help a user determine
what exactly might have led to a failure. There is only one; please
say something if you disagree with the following reasoning.
There are three places this can return abnormally:
- Initially, if there is nothing to clone. It turns out that
right now this cannot happen anyway. The test is in place
because the code below it doesn't work if those conditions
don't hold. As such they could be assertions but since I can
return a null to indicate an error I just do that instead.
I have not added a warning here because it won't happen.
- While processing bio's, if none remain but there are supposed
to be more bytes to clone. Here I have added a warning.
- If bio_clone_range() returns a null pointer. That function
will have already produced a warning (at least the first
time, via WARN_ON_ONCE()) to distinguish the cause of the
error. The only exception is memory exhaustion, and I'd
rather not pepper the code with warnings in all those spots.
So no warning is added in that place.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Tell the user (via dmesg) what was wrong with the arguments provided
via /sys/bus/rbd/add.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Dan Mick <dan.mick@inktank.com>
Define a new function rbd_warn() that produces a boilerplate warning
message, identifying in the resulting message the affected rbd
device in the best way available. Use it in a few places that now
use pr_warning().
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Dan Mick <dan.mick@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
This replaces two kmalloc()/memcpy() combinations with a single
call to kmemdup().
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: David Zafman <david.zafman@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
There is no real benefit to keeping the length of an image id, so
get rid of it.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: David Zafman <david.zafman@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
There may have been a benefit to hanging on to the length of an
image name before, but there is really none now. The only time it's
used is when probing for rbd images, so we can just compute the
length then.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: David Zafman <david.zafman@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
I promised Josh I would document whether there were any restrictions
needed for accessing fields of an rbd_spec structure. This adds a
big block of comments that documents the structure and how it is
used--including the fact that we don't attempt to synchronize access
to it.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: David Zafman <david.zafman@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Hi Asai,
FYI, there are new sparse warnings show up in
tree: git://git.kernel.dk/linux-block.git for-3.9/drivers
head: 3d6a87430e
commit: 152834694d [2/3] mtip32xx: add trim support
>> drivers/block/mtip32xx/mtip32xx.c:1726:5: sparse: symbol 'mtip_send_trim' was not declared. Should it be static?
drivers/block/mtip32xx/mtip32xx.c:3348:17: sparse: cast to restricted __le32
drivers/block/mtip32xx/mtip32xx.c:4125:1: sparse: symbol 'mtip_workq_sdbf0' was not declared. Should it be static?
drivers/block/mtip32xx/mtip32xx.c:4126:1: sparse: symbol 'mtip_workq_sdbf1' was not declared. Should it be static?
drivers/block/mtip32xx/mtip32xx.c:4127:1: sparse: symbol 'mtip_workq_sdbf2' was not declared. Should it be static?
drivers/block/mtip32xx/mtip32xx.c:4128:1: sparse: symbol 'mtip_workq_sdbf3' was not declared. Should it be static?
drivers/block/mtip32xx/mtip32xx.c:4129:1: sparse: symbol 'mtip_workq_sdbf4' was not declared. Should it be static?
drivers/block/mtip32xx/mtip32xx.c:4130:1: sparse: symbol 'mtip_workq_sdbf5' was not declared. Should it be static?
drivers/block/mtip32xx/mtip32xx.c:4131:1: sparse: symbol 'mtip_workq_sdbf6' was not declared. Should it be static?
drivers/block/mtip32xx/mtip32xx.c:4132:1: sparse: symbol 'mtip_workq_sdbf7' was not declared. Should it be static?
drivers/block/mtip32xx/mtip32xx.c: In function 'mtip_hw_read_flags':
drivers/block/mtip32xx/mtip32xx.c:2804:1: warning: the frame size of 1036 bytes is larger than 1024 bytes [-Wframe-larger-than=]
drivers/block/mtip32xx/mtip32xx.c: In function 'mtip_hw_read_registers':
drivers/block/mtip32xx/mtip32xx.c:2781:1: warning: the frame size of 1044 bytes is larger than 1024 bytes [-Wframe-larger-than=]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Hi Asai,
FYI, there are new sparse warnings show up in
tree: git://git.kernel.dk/linux-block.git for-3.9/drivers
head: 3d6a87430e
commit: 16c906e51c [1/3] mtip32xx: Add workqueue and NUMA support
drivers/block/mtip32xx/mtip32xx.c:3267:17: sparse: cast to restricted __le32
>> drivers/block/mtip32xx/mtip32xx.c:4029:1: sparse: symbol 'mtip_workq_sdbf0' was not declared. Should it be static?
>> drivers/block/mtip32xx/mtip32xx.c:4030:1: sparse: symbol 'mtip_workq_sdbf1' was not declared. Should it be static?
>> drivers/block/mtip32xx/mtip32xx.c:4031:1: sparse: symbol 'mtip_workq_sdbf2' was not declared. Should it be static?
>> drivers/block/mtip32xx/mtip32xx.c:4032:1: sparse: symbol 'mtip_workq_sdbf3' was not declared. Should it be static?
>> drivers/block/mtip32xx/mtip32xx.c:4033:1: sparse: symbol 'mtip_workq_sdbf4' was not declared. Should it be static?
>> drivers/block/mtip32xx/mtip32xx.c:4034:1: sparse: symbol 'mtip_workq_sdbf5' was not declared. Should it be static?
>> drivers/block/mtip32xx/mtip32xx.c:4035:1: sparse: symbol 'mtip_workq_sdbf6' was not declared. Should it be static?
>> drivers/block/mtip32xx/mtip32xx.c:4036:1: sparse: symbol 'mtip_workq_sdbf7' was not declared. Should it be static?
drivers/block/mtip32xx/mtip32xx.c: In function 'mtip_hw_read_flags':
drivers/block/mtip32xx/mtip32xx.c:2723:1: warning: the frame size of 1036 bytes is larger than 1024 bytes [-Wframe-larger-than=]
drivers/block/mtip32xx/mtip32xx.c: In function 'mtip_hw_read_registers':
drivers/block/mtip32xx/mtip32xx.c:2700:1: warning: the frame size of 1044 bytes is larger than 1024 bytes [-Wframe-larger-than=]
Please consider folding the below diff :-)
Signed-off-by: Jens Axboe <axboe@kernel.dk>
There is a missing break statement here. This used to return directly
but we re-worked it in 2008 to add locking as part of the BKL push down.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
TRIM support added through vendor unique command.
Signed-off-by: Sam Bradshaw < sbradshaw@micron.com>
Signed-off-by: Asai Thambi S P <asamymuthupa@micron.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This patch contains
* parallel command completion using workers
* bind the workers to the chosen numa node
* bind isr to the chosen numa node
* allocating memory in the chosen numa node
Signed-off-by: Asai Thambi S P <asamymuthupa@micron.com>
Signed-off-by: Sam Bradshaw <sbradshaw@micron.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
When rebuild is in progress, disk->queue is yet to be created. Surprise
removing the device will call remove()-> del_gendisk(). del_gendisk()
expect disk->queue be not NULL. Fix is to call put_disk() when disk_queue
is NULL.
Signed-off-by: Asai Thambi S P <asamymuthupa@micron.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
If an I/O command times out when a PIO command is active,
MTIP_PF_EH_ACTIVE_BIT is not cleared. This results in I/O
hang in the driver. Fix is to clear this bit.
Signed-off-by: Asai Thambi S P <asamymuthupa@micron.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This driver was for the 8 bit ISA cards that were installed in
the PC-XT machines of 1980 vintage. They supported the dual
ribbon cable MFM drives of 10-20MB capacity, and ran at a 3:1
interleave, giving performance on the order of 128kB/s.
By the introduction of the PC-AT (286) these controllers were
already scrapped in favour of 16 bit controllers with some onboard
RAM that could support a 1:1 interleave.
The git history doesn't show any evidence of runtime fixes that
would reflect active usage; instead just the usual tree-wide API
type changes/cleanups. Going back to in-source changelogs, the
last "runtime" fix that is evident is something I did over a
dozen years ago[1] -- and even back then, the hardware was long
since unavailable, so that ancient fix was also not runtime tested.
The time is long overdue for this to get flushed, so lets get
rid of it before anyone wastes more time doing builds and sparse
checks etc. on long since dead code.
[1] http://lkml.indiana.edu/hypermail/linux/kernel/0102.2/0027.html
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
CONFIG_HOTPLUG is going away as an option. As a result, the __dev*
markings need to be removed.
This change removes the use of __devinit, __devexit_p, __devinitdata,
__devinitconst, and __devexit from these drivers.
Based on patches originally written by Bill Pemberton, but redone by me
in order to handle some of the coding style issues better, by hand.
Cc: Bill Pemberton <wfp5p@virginia.edu>
Cc: Mike Miller <mike.miller@hp.com>
Cc: Chirag Kantharia <chirag.kantharia@hp.com>
Cc: Geoff Levand <geoff@infradead.org>
Cc: Jim Paris <jim@jtan.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Matthew Wilcox <matthew.r.wilcox@intel.com>
Cc: Keith Busch <keith.busch@intel.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: NeilBrown <neilb@suse.de>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Tao Guo <Tao.Guo@emc.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
When a file system is mounted on a virtio-blk disk, we then remove it
and then reattach it, the reattached disk gets the same disk name and
ids as the hot removed one.
This leads to very nasty effects - mostly rendering the newly attached
device completely unusable.
Trying what happens when I do the same thing with a USB device, I saw
that the sd node simply doesn't get free'd when a device gets forcefully
removed.
Imitate the same behavior for vd devices. This way broken vd devices
simply are never free'd and newly attached ones keep working just fine.
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: stable@kernel.org
Pull Ceph update from Sage Weil:
"There are a few different groups of commits here. The largest is
Alex's ongoing work to enable the coming RBD features (cloning,
striping). There is some cleanup in libceph that goes along with it.
Cyril and David have fixed some problems with NFS reexport (leaking
dentries and page locks), and there is a batch of patches from Yan
fixing problems with the fs client when running against a clustered
MDS. There are a few bug fixes mixed in for good measure, many of
which will be going to the stable trees once they're upstream.
My apologies for the late pull. There is still a gremlin in the rbd
map/unmap code and I was hoping to include the fix for that as well,
but we haven't been able to confirm the fix is correct yet; I'll send
that in a separate pull once it's nailed down."
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client: (68 commits)
rbd: get rid of rbd_{get,put}_dev()
libceph: register request before unregister linger
libceph: don't use rb_init_node() in ceph_osdc_alloc_request()
libceph: init event->node in ceph_osdc_create_event()
libceph: init osd->o_node in create_osd()
libceph: report connection fault with warning
libceph: socket can close in any connection state
rbd: don't use ENOTSUPP
rbd: remove linger unconditionally
rbd: get rid of RBD_MAX_SEG_NAME_LEN
libceph: avoid using freed osd in __kick_osd_requests()
ceph: don't reference req after put
rbd: do not allow remove of mounted-on image
libceph: Unlock unprocessed pages in start_read() error path
ceph: call handle_cap_grant() for cap import message
ceph: Fix __ceph_do_pending_vmtruncate
ceph: Don't add dirty inode to dirty list if caps is in migration
ceph: Fix infinite loop in __wake_requests
ceph: Don't update i_max_size when handling non-auth cap
bdi_register: add __printf verification, fix arg mismatch
...
The functions rbd_get_dev() and rbd_put_dev() are trivial wrappers
that add no value, and their existence suggests they may do more
than what they do.
Get rid of them.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Dan Mick <dan.mick@inktank.com>
Konrad writes:
Please git pull the following branch:
git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git stable/for-jens-3.8
which has a bug-fix to the xen-blkfront and xen-blkback driver
when using the persistent mode. An issue was discovered where LVM
disks could not be read correctly and this fixes it. There
is also a change in llist.h which has been blessed by akpm.
Merge misc patches from Andrew Morton:
"Incoming:
- lots of misc stuff
- backlight tree updates
- lib/ updates
- Oleg's percpu-rwsem changes
- checkpatch
- rtc
- aoe
- more checkpoint/restart support
I still have a pile of MM stuff pending - Pekka should be merging
later today after which that is good to go. A number of other things
are twiddling thumbs awaiting maintainer merges."
* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (180 commits)
scatterlist: don't BUG when we can trivially return a proper error.
docs: update documentation about /proc/<pid>/fdinfo/<fd> fanotify output
fs, fanotify: add @mflags field to fanotify output
docs: add documentation about /proc/<pid>/fdinfo/<fd> output
fs, notify: add procfs fdinfo helper
fs, exportfs: add exportfs_encode_inode_fh() helper
fs, exportfs: escape nil dereference if no s_export_op present
fs, epoll: add procfs fdinfo helper
fs, eventfd: add procfs fdinfo helper
procfs: add ability to plug in auxiliary fdinfo providers
tools/testing/selftests/kcmp/kcmp_test.c: print reason for failure in kcmp_test
breakpoint selftests: print failure status instead of cause make error
kcmp selftests: print fail status instead of cause make error
kcmp selftests: make run_tests fix
mem-hotplug selftests: print failure status instead of cause make error
cpu-hotplug selftests: print failure status instead of cause make error
mqueue selftests: print failure status instead of cause make error
vm selftests: print failure status instead of cause make error
ubifs: use prandom_bytes
mtd: nandsim: use prandom_bytes
...
We should return NULL on failure instead of returning a freed pointer.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Ed Cashin <ecashin@coraid.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This version number is printed to the console on module initialization
and is available in sysfs, which is where the userland aoe-version tool
looks for it.
Signed-off-by: Ed Cashin <ecashin@coraid.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This change only affects experimental AoE storage networks.
It modifies the console message about runt packets detected so that the
AoE major and minor addresses of the AoE target that generated the runt
are mentioned.
Signed-off-by: Ed Cashin <ecashin@coraid.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
By default, the aoe driver uses any ethernet interface for AoE, but the
aoe_iflist module parameter provides a convenient way to limit AoE
traffic to a specific list of local network interfaces.
This change allows a list to be specified using the comma character as a
separator. For example,
modprobe aoe aoe_iflist=eth2,eth3
Before, it was inconvenient to get the quoting right in shell scripts
when setting aoe_iflist to have more than one network interface.
Signed-off-by: Ed Cashin <ecashin@coraid.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
With this change, the aoe driver treats the value zero as special for
the aoe_deadsecs module parameter. Normally, this value specifies the
number of seconds during which the driver will continue to attempt
retransmits to an unresponsive AoE target. After aoe_deadsecs has
elapsed, the aoe driver marks the aoe device as "down" and fails all
I/O.
The new meaning of an aoe_deadsecs of zero is for the driver to
retransmit commands indefinitely.
Signed-off-by: Ed Cashin <ecashin@coraid.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Many AoE targets have four or fewer network ports, but some existing
storage devices have many, and the AoE protocol sets no limit.
This patch allows the use of more than eight remote MAC addresses per AoE
target, while reducing the amount of memory used by the aoe driver in
cases where there are many AoE targets with fewer than eight MAC addresses
each.
Signed-off-by: Ed Cashin <ecashin@coraid.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This change avoids a race that could result in a NULL pointer derference
following a WARNing from kobject_add_internal, "don't try to register
things with the same name in the same directory."
The problem was found with a test that forgets and discovers an
aoe device in a loop:
while test ! -r /tmp/stop; do
aoe-flush -a
aoe-discover
done
The race was between aoedev_flush taking aoedevs out of the devlist,
allowing a new discovery of the same AoE target to take place before the
driver gets around to calling sysfs_remove_group. Fixing that one
revealed another race between do_open and add_disk, and this patch avoids
that, too.
The fix required some care, because for flushing (forgetting) an aoedev,
some of the steps must be performed under lock and some must be able to
sleep. Also, for discovering a new aoedev, some steps might sleep.
The check for a bad aoedev pointer remains from a time when about half of
this patch was done, and it was possible for the
bdev->bd_disk->private_data to become corrupted. The check should be
removed eventually, but it is not expected to add significant overhead,
occurring in the aoeblk_open routine.
Signed-off-by: Ed Cashin <ecashin@coraid.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
