Commit Graph

829 Commits

Author SHA1 Message Date
Ilya Dryomov c300156bc7 rbd: pass rbd_spec into parse_rbd_opts_token()
In preparation for _pool_ns client option, make rbd_spec available
inside parse_rbd_opts_token().

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2018-08-02 21:26:11 +02:00
Ilya Dryomov 2f56b6bae7 libceph: amend "bad option arg" error message
Don't mention "mount" -- in the rbd case it is "mapping".

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2018-08-02 21:26:11 +02:00
Mark Rutland bfc18e389c atomics/treewide: Rename __atomic_add_unless() => atomic_fetch_add_unless()
While __atomic_add_unless() was originally intended as a building-block
for atomic_add_unless(), it's now used in a number of places around the
kernel. It's the only common atomic operation named __atomic*(), rather
than atomic_*(), and for consistency it would be better named
atomic_fetch_add_unless().

This lack of consistency is slightly confusing, and gets in the way of
scripting atomics. Given that, let's clean things up and promote it to
an official part of the atomics API, in the form of
atomic_fetch_add_unless().

This patch converts definitions and invocations over to the new name,
including the instrumented version, using the following script:

  ----
  git grep -w __atomic_add_unless | while read line; do
  sed -i '{s/\<__atomic_add_unless\>/atomic_fetch_add_unless/}' "${line%%:*}";
  done
  git grep -w __arch_atomic_add_unless | while read line; do
  sed -i '{s/\<__arch_atomic_add_unless\>/arch_atomic_fetch_add_unless/}' "${line%%:*}";
  done
  ----

Note that we do not have atomic{64,_long}_fetch_add_unless(), which will
be introduced by later patches.

There should be no functional change as a result of this patch.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Will Deacon <will.deacon@arm.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Palmer Dabbelt <palmer@sifive.com>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/lkml/20180621121321.4761-2-mark.rutland@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2018-06-21 14:22:32 +02:00
Linus Torvalds dc594c39f7 The main piece is a set of libceph changes that revamps how OSD
requests are aborted, improving CephFS ENOSPC handling and making
 "umount -f" actually work (Zheng and myself).  The rest is mostly
 mount option handling cleanups from Chengguang and assorted fixes
 from Zheng, Luis and Dongsheng.
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Merge tag 'ceph-for-4.18-rc1' of git://github.com/ceph/ceph-client

Pull ceph updates from Ilya Dryomov:
 "The main piece is a set of libceph changes that revamps how OSD
  requests are aborted, improving CephFS ENOSPC handling and making
  "umount -f" actually work (Zheng and myself).

  The rest is mostly mount option handling cleanups from Chengguang and
  assorted fixes from Zheng, Luis and Dongsheng.

* tag 'ceph-for-4.18-rc1' of git://github.com/ceph/ceph-client: (31 commits)
  rbd: flush rbd_dev->watch_dwork after watch is unregistered
  ceph: update description of some mount options
  ceph: show ino32 if the value is different with default
  ceph: strengthen rsize/wsize/readdir_max_bytes validation
  ceph: fix alignment of rasize
  ceph: fix use-after-free in ceph_statfs()
  ceph: prevent i_version from going back
  ceph: fix wrong check for the case of updating link count
  libceph: allocate the locator string with GFP_NOFAIL
  libceph: make abort_on_full a per-osdc setting
  libceph: don't abort reads in ceph_osdc_abort_on_full()
  libceph: avoid a use-after-free during map check
  libceph: don't warn if req->r_abort_on_full is set
  libceph: use for_each_request() in ceph_osdc_abort_on_full()
  libceph: defer __complete_request() to a workqueue
  libceph: move more code into __complete_request()
  libceph: no need to call flush_workqueue() before destruction
  ceph: flush pending works before shutdown super
  ceph: abort osd requests on force umount
  libceph: introduce ceph_osdc_abort_requests()
  ...
2018-06-15 07:24:58 +09:00
Dongsheng Yang 23edca8649 rbd: flush rbd_dev->watch_dwork after watch is unregistered
There is a problem if we are going to unmap a rbd device and the
watch_dwork is going to queue delayed work for watch:

unmap Thread                    watch Thread                  timer
do_rbd_remove
  cancel_tasks_sync(rbd_dev)
                                queue_delayed_work for watch
  destroy_workqueue(rbd_dev->task_wq)
    drain_workqueue(wq)
    destroy other resources in wq
                                                              call_timer_fn
                                                                __queue_work()

Then the delayed work escape the cancel_tasks_sync() and
destroy_workqueue() and we will get an user-after-free call trace:

  BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
  PGD 0 P4D 0
  Oops: 0000 [#1] SMP PTI
  Modules linked in:
  CPU: 7 PID: 0 Comm: swapper/7 Tainted: G           OE     4.17.0-rc6+ #13
  Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011
  RIP: 0010:__queue_work+0x6a/0x3b0
  RSP: 0018:ffff9427df1c3e90 EFLAGS: 00010086
  RAX: ffff9427deca8400 RBX: 0000000000000000 RCX: 0000000000000000
  RDX: ffff9427deca8400 RSI: ffff9427df1c3e50 RDI: 0000000000000000
  RBP: ffff942783e39e00 R08: ffff9427deca8400 R09: ffff9427df1c3f00
  R10: 0000000000000004 R11: 0000000000000005 R12: ffff9427cfb85970
  R13: 0000000000002000 R14: 000000000001eca0 R15: 0000000000000007
  FS:  0000000000000000(0000) GS:ffff9427df1c0000(0000) knlGS:0000000000000000
  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  CR2: 0000000000000000 CR3: 00000004c900a005 CR4: 00000000000206e0
  Call Trace:
   <IRQ>
   ? __queue_work+0x3b0/0x3b0
   call_timer_fn+0x2d/0x130
   run_timer_softirq+0x16e/0x430
   ? tick_sched_timer+0x37/0x70
   __do_softirq+0xd2/0x280
   irq_exit+0xd5/0xe0
   smp_apic_timer_interrupt+0x6c/0x130
   apic_timer_interrupt+0xf/0x20

[ Move rbd_dev->watch_dwork cancellation so that rbd_reregister_watch()
  either bails out early because the watch is UNREGISTERED at that point
  or just gets cancelled. ]

Cc: stable@vger.kernel.org
Fixes: 99d1694310 ("rbd: retry watch re-registration periodically")
Signed-off-by: Dongsheng Yang <dongsheng.yang@easystack.cn>
Reviewed-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2018-06-04 20:46:02 +02:00
Chengguang Xu fe943d5042 libceph, rbd: add error handling for osd_req_op_cls_init()
Add proper error handling for osd_req_op_cls_init() to replace
BUG_ON statement when failing from memory allocation.

Signed-off-by: Chengguang Xu <cgxu519@gmx.com>
Reviewed-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2018-06-04 20:45:54 +02:00
Linus Torvalds f459c34538 for-4.18/block-20180603
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Merge tag 'for-4.18/block-20180603' of git://git.kernel.dk/linux-block

Pull block updates from Jens Axboe:

 - clean up how we pass around gfp_t and
   blk_mq_req_flags_t (Christoph)

 - prepare us to defer scheduler attach (Christoph)

 - clean up drivers handling of bounce buffers (Christoph)

 - fix timeout handling corner cases (Christoph/Bart/Keith)

 - bcache fixes (Coly)

 - prep work for bcachefs and some block layer optimizations (Kent).

 - convert users of bio_sets to using embedded structs (Kent).

 - fixes for the BFQ io scheduler (Paolo/Davide/Filippo)

 - lightnvm fixes and improvements (Matias, with contributions from Hans
   and Javier)

 - adding discard throttling to blk-wbt (me)

 - sbitmap blk-mq-tag handling (me/Omar/Ming).

 - remove the sparc jsflash block driver, acked by DaveM.

 - Kyber scheduler improvement from Jianchao, making it more friendly
   wrt merging.

 - conversion of symbolic proc permissions to octal, from Joe Perches.
   Previously the block parts were a mix of both.

 - nbd fixes (Josef and Kevin Vigor)

 - unify how we handle the various kinds of timestamps that the block
   core and utility code uses (Omar)

 - three NVMe pull requests from Keith and Christoph, bringing AEN to
   feature completeness, file backed namespaces, cq/sq lock split, and
   various fixes

 - various little fixes and improvements all over the map

* tag 'for-4.18/block-20180603' of git://git.kernel.dk/linux-block: (196 commits)
  blk-mq: update nr_requests when switching to 'none' scheduler
  block: don't use blocking queue entered for recursive bio submits
  dm-crypt: fix warning in shutdown path
  lightnvm: pblk: take bitmap alloc. out of critical section
  lightnvm: pblk: kick writer on new flush points
  lightnvm: pblk: only try to recover lines with written smeta
  lightnvm: pblk: remove unnecessary bio_get/put
  lightnvm: pblk: add possibility to set write buffer size manually
  lightnvm: fix partial read error path
  lightnvm: proper error handling for pblk_bio_add_pages
  lightnvm: pblk: fix smeta write error path
  lightnvm: pblk: garbage collect lines with failed writes
  lightnvm: pblk: rework write error recovery path
  lightnvm: pblk: remove dead function
  lightnvm: pass flag on graceful teardown to targets
  lightnvm: pblk: check for chunk size before allocating it
  lightnvm: pblk: remove unnecessary argument
  lightnvm: pblk: remove unnecessary indirection
  lightnvm: pblk: return NVM_ error on failed submission
  lightnvm: pblk: warn in case of corrupted write buffer
  ...
2018-06-04 07:58:06 -07:00
Joe Perches 5657a819a8 block drivers/block: Use octal not symbolic permissions
Convert the S_<FOO> symbolic permissions to their octal equivalents as
using octal and not symbolic permissions is preferred by many as more
readable.

see: https://lkml.org/lkml/2016/8/2/1945

Done with automated conversion via:
$ ./scripts/checkpatch.pl -f --types=SYMBOLIC_PERMS --fix-inplace <files...>

Miscellanea:

o Wrapped modified multi-line calls to a single line where appropriate
o Realign modified multi-line calls to open parenthesis

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-05-24 13:38:59 -06:00
Ilya Dryomov 0010f7052d libceph: add osd_req_op_extent_osd_data_bvecs()
... and store num_bvecs for client code's convenience.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>
2018-05-10 10:15:05 +02:00
Ilya Dryomov d93605407a rbd: notrim map option
Add an option to turn off discard and write zeroes offload support to
avoid deprovisioning a fully provisioned image.  When enabled, discard
requests will fail with -EOPNOTSUPP, write zeroes requests will fall
back to manually zeroing.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Tested-by: Hitoshi Kamei <hitoshi.kamei.xm@hitachi.com>
2018-04-16 09:38:40 +02:00
Ilya Dryomov 420efbdf4d rbd: adjust queue limits for "fancy" striping
In order to take full advantage of merging in ceph_file_to_extents(),
allow object set sized I/Os.  If the layout is not "fancy", an object
set consists of just one object.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2018-04-16 09:38:40 +02:00
Arnd Bergmann c6244b3b23 rbd: avoid Wreturn-type warnings
In some configurations gcc cannot see that rbd_assert(0) leads to an
unreachable code path:

  drivers/block/rbd.c: In function 'rbd_img_is_write':
  drivers/block/rbd.c:1397:1: error: control reaches end of non-void function [-Werror=return-type]
  drivers/block/rbd.c: In function '__rbd_obj_handle_request':
  drivers/block/rbd.c:2499:1: error: control reaches end of non-void function [-Werror=return-type]
  drivers/block/rbd.c: In function 'rbd_obj_handle_write':
  drivers/block/rbd.c:2471:1: error: control reaches end of non-void function [-Werror=return-type]

As the rbd_assert() here shows has no extra information beyond the verbose
BUG(), we can simply use BUG() directly in its place.  This is reliably
detected as not returning on any architecture, since it doesn't depend
on the unlikely() comparison that confused gcc.

Fixes: 3da691bf43 ("rbd: new request handling code")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2018-04-16 09:38:40 +02:00
Dongsheng Yang 34f55d0b3a rbd: support timeout in rbd_wait_state_locked()
currently, the rbd_wait_state_locked() will wait forever if we
can't get our state locked. Example:

rbd map --exclusive test1  --> /dev/rbd0
rbd map test1  --> /dev/rbd1
dd if=/dev/zero of=/dev/rbd1 bs=1M count=1 --> IO blocked

To avoid this problem, this patch introduce a timeout design
in rbd_wait_state_locked(). Then rbd_wait_state_locked() will
return error when we reach a timeout.

This patch allow user to set the lock_timeout in rbd mapping.

Signed-off-by: Dongsheng Yang <dongsheng.yang@easystack.cn>
Reviewed-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2018-04-16 09:38:40 +02:00
Ilya Dryomov 2f18d46683 rbd: refactor rbd_wait_state_locked()
In preparation for lock_timeout option, make rbd_wait_state_locked()
return error codes.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2018-04-16 09:38:40 +02:00
Linus Torvalds b284d4d5a6 The big ticket items are:
- support for rbd "fancy" striping (myself).  The striping feature bit
   is now fully implemented, allowing mapping v2 images with non-default
   striping patterns.  This completes support for --image-format 2.
 
 - CephFS quota support (Luis Henriques and Zheng Yan).  This set is
   based on the new SnapRealm code in the upcoming v13.y.z ("Mimic")
   release.  Quota handling will be rejected on older filesystems.
 
 - memory usage improvements in CephFS (Chengguang Xu).  Directory
   specific bits have been split out of ceph_file_info and some effort
   went into improving cap reservation code to avoid OOM crashes.
 
 Also included a bunch of assorted fixes all over the place from
 Chengguang and others.
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Merge tag 'ceph-for-4.17-rc1' of git://github.com/ceph/ceph-client

Pull ceph updates from Ilya Dryomov:
 "The big ticket items are:

   - support for rbd "fancy" striping (myself).

     The striping feature bit is now fully implemented, allowing mapping
     v2 images with non-default striping patterns. This completes
     support for --image-format 2.

   - CephFS quota support (Luis Henriques and Zheng Yan).

     This set is based on the new SnapRealm code in the upcoming v13.y.z
     ("Mimic") release. Quota handling will be rejected on older
     filesystems.

   - memory usage improvements in CephFS (Chengguang Xu).

     Directory specific bits have been split out of ceph_file_info and
     some effort went into improving cap reservation code to avoid OOM
     crashes.

  Also included a bunch of assorted fixes all over the place from
  Chengguang and others"

* tag 'ceph-for-4.17-rc1' of git://github.com/ceph/ceph-client: (67 commits)
  ceph: quota: report root dir quota usage in statfs
  ceph: quota: add counter for snaprealms with quota
  ceph: quota: cache inode pointer in ceph_snap_realm
  ceph: fix root quota realm check
  ceph: don't check quota for snap inode
  ceph: quota: update MDS when max_bytes is approaching
  ceph: quota: support for ceph.quota.max_bytes
  ceph: quota: don't allow cross-quota renames
  ceph: quota: support for ceph.quota.max_files
  ceph: quota: add initial infrastructure to support cephfs quotas
  rbd: remove VLA usage
  rbd: fix spelling mistake: "reregisteration" -> "reregistration"
  ceph: rename function drop_leases() to a more descriptive name
  ceph: fix invalid point dereference for error case in mdsc destroy
  ceph: return proper bool type to caller instead of pointer
  ceph: optimize memory usage
  ceph: optimize mds session register
  libceph, ceph: add __init attribution to init funcitons
  ceph: filter out used flags when printing unused open flags
  ceph: don't wait on writeback when there is no more dirty pages
  ...
2018-04-10 12:25:30 -07:00
Kyle Spiers 08a79102aa rbd: remove VLA usage
As part of the effort to remove VLAs from the kernel[1], this moves
the literal values into the stack array calculation instead of using a
variable for the sizing. The resulting size can be found from
sizeof(buf).

[1] https://lkml.org/lkml/2018/3/7/621

Signed-off-by: Kyle Spiers <kyle@spiers.me>
Reviewed-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2018-04-02 10:12:50 +02:00
Colin Ian King f6870cc9a3 rbd: fix spelling mistake: "reregisteration" -> "reregistration"
Trivial fix to spelling mistake in rdb_warn message text.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2018-04-02 10:12:49 +02:00
Ilya Dryomov dd4358550f rbd: get the latest osdmap when using an existing client
Currently we request the latest osdmap only if ceph_pg_poolid_by_name()
fails with -ENOENT.  This is effective with newly created pools, but we
also want to avoid attempting to map from pools that were recently
deleted and report "pool does not exist" instead.  (Such an attempt
eventually fails in the OSD client after map check code kicks in, but
the error message is confusing.)

Request the latest osdmap unconditionally after bumping a ref on an
existing client in rbd_client_find().

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2018-04-02 10:12:46 +02:00
Ilya Dryomov 5feb0d8d2f rbd: move rbd_get_client() below rbd_put_client()
... to avoid a forward declaration in the next commit.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2018-04-02 10:12:46 +02:00
Ilya Dryomov 0a4a1e68d8 rbd: remove redundant declaration of rbd_spec_put()
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2018-04-02 10:12:46 +02:00
Ilya Dryomov b133185217 rbd: allow "fancy" striping
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Acked-by: Jason Dillaman <dillaman@redhat.com>
2018-04-02 10:12:44 +02:00
Ilya Dryomov afb978884c rbd: introduce OWN_BVECS data type
If the layout is "fancy", we need to be able to rearrange the provided
bio_vecs in stripe unit chunks to make it possible for the messenger to
read/write directly from/to the provided data buffer, without employing
a temporary data buffer for assembling the result.

Higher level bio_vec arrays are generally immutable, so this requires
copying into a private array.  Only the bio_vecs themselves are shuffled
around, not the actual data.  OWN_BVECS doesn't own any pages.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2018-04-02 10:12:44 +02:00
Ilya Dryomov e93aca0abb rbd: remove rbd_parent_request_{create,destroy}()
rbd_parent_request_create() takes a ref on obj_req for child_img_req.
There is no point in doing that because child_img_req is created on
behalf of obj_req -- obj_req is the initiator and can't be completed
before child_img_req.

Open-code the rest of rbd_parent_request_create() and remove it along
with rbd_parent_request_destroy().

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2018-04-02 10:12:44 +02:00
Ilya Dryomov dfd9875f11 rbd: get rid of img_req->{offset,length}
These are set, but no longer used.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2018-04-02 10:12:44 +02:00
Ilya Dryomov 0420c5dd2e rbd: remove rbd_img_request_fill() and helpers
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2018-04-02 10:12:43 +02:00
Ilya Dryomov 5a237819aa rbd: switch to common striping framework
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2018-04-02 10:12:43 +02:00
Ilya Dryomov 2bb1e56ec6 rbd: create+truncate for whole-object layered discards
A whole-object layered discard is implemented as a truncate rather
than a delete: a dummy object is needed to prevent the CoW machinery
from kicking in.  However, a truncate on a non-existent object is
a no-op.  If the object doesn't exist in HEAD, a discard request is
effectively ignored, which violates our "discard zeroes data" promise
and breaks REQ_OP_WRITE_ZEROES implementation.

A non-exclusive create on an existing object is also a no-op, so the
fix is to do a compound create+truncate instead.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2018-04-02 10:12:43 +02:00
Ilya Dryomov 86bd7998fa rbd: move to obj_req->img_extents
In preparation for rbd "fancy" striping, replace obj_req->img_offset
with obj_req->img_extents.  A single starting offset isn't sufficient
because we want only one OSD request per object and will merge adjacent
object extents in ceph_file_to_extents().  The final object extent may
map into multiple different byte ranges in the image.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2018-04-02 10:12:43 +02:00
Ilya Dryomov 43df3d35c0 rbd: incorporate ceph_object_extent
obj_req->object_no -> obj_req->ex.oe_objno
obj_req->offset -> obj_req->ex.oe_off
obj_req->length -> obj_req->ex.oe_len

... and use ex for linking object requests to image requests.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2018-04-02 10:12:43 +02:00
Ilya Dryomov ecc633caeb rbd: store data_type in img_req instead of obj_req
All object requests are associated with an image request now -- avoid
duplicating the same info in each object request.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2018-04-02 10:12:42 +02:00
Ilya Dryomov 0be2d60ed8 rbd: remove obj_req->flags field
There are no standalone (!IMG_DATA) object requests anymore.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2018-04-02 10:12:42 +02:00
Ilya Dryomov 15961b4494 rbd: remove old request completion code
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2018-04-02 10:12:42 +02:00
Ilya Dryomov 7114edac35 rbd: new request completion code
Do away with partial request completions and all the associated
complexity.  Individual object requests no longer need to be completed
in order -- when the last one becomes ready, we complete the entire
higher level request all at once.

This also wraps up the conversion to a state machine model and
eliminates the recursion described in commit 6d69bb536b ("rbd:
prevent kernel stack blow up on rbd map").

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2018-04-02 10:12:41 +02:00
Ilya Dryomov efbd1a1106 rbd: update rbd_img_request_submit() signature
It should be void now.  Also, object requests are unlinked only in
image request destructor, which can't run before rbd_img_request_put(),
so no need for _safe.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2018-04-02 10:12:41 +02:00
Ilya Dryomov 9bb0248d9e rbd: add img_req->op_type field
Store op_type in its own field instead of packing it into flags.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2018-04-02 10:12:41 +02:00
Ilya Dryomov a162b308dc rbd: simplify rbd_osd_req_create()
No need to pass rbd_dev and op_type to rbd_osd_req_create(): there are
no standalone (!IMG_DATA) object requests anymore and osd_req->r_flags
can be set in rbd_osd_req_format_{read,write}().

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2018-04-02 10:12:40 +02:00
Ilya Dryomov 51c3509e5e rbd: remove old request handling code
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2018-04-02 10:12:40 +02:00
Ilya Dryomov 3da691bf43 rbd: new request handling code
The notable changes are:

- instead of explicitly stat'ing the object to see if it exists before
  issuing the write, send the write optimistically along with the stat
  in a single OSD request
- zero copyup optimization
- all object requests are associated with an image request and have
  a valid ->img_request pointer; there are no standalone (!IMG_DATA)
  object requests anymore
- code is structured as a state machine (vs a bunch of callbacks with
  implicit state)

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2018-04-02 10:12:40 +02:00
Ilya Dryomov 7e07efb12d rbd: move from raw pages to bvec data descriptors
In preparation for rbd "fancy" striping which requires bio_vec arrays,
wire up BVECS data type and kill off PAGES data type.  There is nothing
wrong with using page vectors for copyup requests -- it's just less
iterator boilerplate code to write for the new striping framework.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Alex Elder <elder@linaro.org>
2018-04-02 10:12:39 +02:00
Ilya Dryomov f9dcbc44cd rbd: get rid of img_req->copyup_pages
The initiating object request is the proper owner -- save a bit of
space.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Alex Elder <elder@linaro.org>
2018-04-02 10:12:39 +02:00
Ilya Dryomov 06fbb69935 rbd: don't (ab)use obj_req->pages for stat requests
obj_req->pages is for provided data buffers.  stat requests are
internal and should be NODATA.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Alex Elder <elder@linaro.org>
2018-04-02 10:12:39 +02:00
Ilya Dryomov df6ba7015d rbd: remove bio cloning helpers
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Alex Elder <elder@linaro.org>
2018-04-02 10:12:39 +02:00
Ilya Dryomov 5359a17d27 libceph, rbd: new bio handling code (aka don't clone bios)
The reason we clone bios is to be able to give each object request
(and consequently each ceph_osd_data/ceph_msg_data item) its own
pointer to a (list of) bio(s).  The messenger then initializes its
cursor with cloned bio's ->bi_iter, so it knows where to start reading
from/writing to.  That's all the cloned bios are used for: to determine
each object request's starting position in the provided data buffer.

Introduce ceph_bio_iter to do exactly that -- store position within bio
list (i.e. pointer to bio) + position within that bio (i.e. bvec_iter).

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2018-04-02 10:12:38 +02:00
Ilya Dryomov a1fbb5e7bb rbd: start enums at 1 instead of 0
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2018-04-02 10:12:38 +02:00
Ilya Dryomov 24f1df60ce rbd: set max_segment_size to UINT_MAX
Commit 21acdf45f4 ("rbd: set max_segments to USHRT_MAX") removed the
limit on max_segments.  Remove the limit on max_segment_size as well.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Alex Elder <elder@linaro.org>
2018-04-02 10:12:38 +02:00
Bart Van Assche 233bde21aa block: Move SECTOR_SIZE and SECTOR_SHIFT definitions into <linux/blkdev.h>
It happens often while I'm preparing a patch for a block driver that
I'm wondering: is a definition of SECTOR_SIZE and/or SECTOR_SHIFT
available for this driver? Do I have to introduce definitions of these
constants before I can use these constants? To avoid this confusion,
move the existing definitions of SECTOR_SIZE and SECTOR_SHIFT into the
<linux/blkdev.h> header file such that these become available for all
block drivers. Make the SECTOR_SIZE definition in the uapi msdos_fs.h
header file conditional to avoid that including that header file after
<linux/blkdev.h> causes the compiler to complain about a SECTOR_SIZE
redefinition.

Note: the SECTOR_SIZE / SECTOR_SHIFT / SECTOR_BITS definitions have
not been removed from uapi header files nor from NAND drivers in
which these constants are used for another purpose than converting
block layer offsets and sizes into a number of sectors.

Cc: David S. Miller <davem@davemloft.net>
Cc: Mike Snitzer <snitzer@redhat.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Nitin Gupta <ngupta@vflare.org>
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-03-17 14:45:23 -06:00
Bart Van Assche 8b904b5b6b block: Use blk_queue_flag_*() in drivers instead of queue_flag_*()
This patch has been generated as follows:

for verb in set_unlocked clear_unlocked set clear; do
  replace-in-files queue_flag_${verb} blk_queue_flag_${verb%_unlocked} \
    $(git grep -lw queue_flag_${verb} drivers block/bsg*)
done

Except for protecting all queue flag changes with the queue lock
this patch does not change any functionality.

Cc: Mike Snitzer <snitzer@redhat.com>
Cc: Shaohua Li <shli@fb.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-03-08 14:13:48 -07:00
Ilya Dryomov e573427a44 rbd: whitelist RBD_FEATURE_OPERATIONS feature bit
This feature bit restricts older clients from performing certain
maintenance operations against an image (e.g. clone, snap create).
krbd does not perform maintenance operations.

Cc: stable@vger.kernel.org
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jason Dillaman <dillaman@redhat.com>
2018-01-29 18:36:03 +01:00
Ilya Dryomov d98f153f1a rbd: don't NULL out ->obj_request in rbd_img_obj_parent_read_full()
If rbd_img_request_submit() fails, parent_request->obj_request is
NULLed out, triggering an assert in rbd_obj_request_put():

  rbd_img_request_put(parent_request)
    rbd_parent_request_destroy
      rbd_obj_request_put(NULL)

Just remove it -- parent_request->obj_request will be put in
rbd_parent_request_destroy().

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2018-01-29 15:23:01 +01:00
Ilya Dryomov a0c5895b27 rbd: use kmem_cache_zalloc() in rbd_img_request_create()
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2018-01-29 15:23:01 +01:00
Ilya Dryomov 2e584bce70 rbd: obj_request->completion is unused
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2018-01-29 15:22:56 +01:00
Ilya Dryomov 21acdf45f4 rbd: set max_segments to USHRT_MAX
Commit d3834fefcf ("rbd: bump queue_max_segments") bumped
max_segments (unsigned short) to max_hw_sectors (unsigned int).
max_hw_sectors is set to the number of 512-byte sectors in an object
and overflows unsigned short for 32M (largest possible) objects, making
the block layer resort to handing us single segment (i.e. single page
or even smaller) bios in that case.

Cc: stable@vger.kernel.org
Fixes: d3834fefcf ("rbd: bump queue_max_segments")
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Alex Elder <elder@linaro.org>
2018-01-09 17:40:48 +01:00
Florian Margaine edd8ca8015 rbd: reacquire lock should update lock owner client id
Otherwise, future operations on this RBD using exclusive-lock are
going to require the lock from a non-existent client id.

Cc: stable@vger.kernel.org
Fixes: 14bb211d32 ("rbd: support updating the lock cookie without releasing the lock")
Link: http://tracker.ceph.com/issues/19929
Signed-off-by: Florian Margaine <florian@platform.sh>
[idryomov@gmail.com: rbd_set_owner_cid() call, __rbd_lock() helper]
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2018-01-09 17:40:21 +01:00
Ilya Dryomov 3cfa3b16dd rbd: default to single-major device number scheme
It's been 3.5 years, let's turn it on by default.  Support in rbd(8)
utility goes back to pre-firefly, "rbd map" has been loading the module
with single_major=Y ever since.  However, if the module is already
loaded (whether by hand or at boot time), we end up with single_major=N.
Also, some people don't install rbd(8) and use the sysfs interface
directly.

(With single-major=N, a major number is consumed for every mapping,
imposing a limit of ~240 rbd images per host.  single-major=Y allows
mapping thousands of rbd images on a single machine.)

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jason Dillaman <dillaman@redhat.com>
2017-11-13 16:33:08 +01:00
David Disseldorp 7c08428979 rbd: set discard_alignment to zero
RBD devices are currently incorrectly initialised with the block queue
discard_alignment set to the underlying RADOS object size.

As per Documentation/ABI/testing/sysfs-block:
  The discard_alignment parameter indicates how many bytes the beginning
  of the device is offset from the internal allocation unit's natural
  alignment.

Correcting the discard_alignment parameter from the RADOS object size to
zero (the blk_set_default_limits() default) has no effect on how discard
requests are propagated through the block layer - @alignment in
__blkdev_issue_discard() remains zero. However, it does fix the UNMAP
granularity alignment value advertised to SCSI initiators via the Block
Limits VPD.

Signed-off-by: David Disseldorp <ddiss@suse.de>
Reviewed-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2017-11-13 12:12:44 +01:00
Ilya Dryomov 9568c93eca rbd: get rid of rbd_mapping::read_only
It is redundant -- rw/ro state is stored in hd_struct and managed by
the block layer.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2017-11-13 12:11:41 +01:00
Ilya Dryomov 1de797bb24 rbd: fix and simplify rbd_ioctl_set_ro()
->open_count/-EBUSY check is bogus and wrong: when an open device is
set read-only, blkdev_write_iter() refuses further writes with -EPERM.
This is standard behaviour and all other block devices allow this.

set_disk_ro() call is also problematic: we affect the entire device
when called on a single partition.

All rbd_ioctl_set_ro() needs to do is refuse ro -> rw transition for
mapped snapshots.  Everything else can be handled by generic code.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2017-11-13 12:11:41 +01:00
Ilya Dryomov 1e37f2f846 rbd: use GFP_NOIO for parent stat and data requests
rbd_img_obj_exists_submit() and rbd_img_obj_parent_read_full() are on
the writeback path for cloned images -- we attempt a stat on the parent
object to see if it exists and potentially read it in to call copyup.
GFP_NOIO should be used instead of GFP_KERNEL here.

Cc: stable@vger.kernel.org
Link: http://tracker.ceph.com/issues/22014
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: David Disseldorp <ddiss@suse.de>
2017-11-09 09:32:53 +01:00
Kefeng Wang 37f1325257 rbd: silence bogus uninitialized use warning in rbd_acquire_lock()
drivers/block/rbd.c: In function 'rbd_acquire_lock':
  drivers/block/rbd.c:3602:44: error: 'ret' may be used uninitialized in this function [-Werror=maybe-uninitialized]

Silence the warning, found it when built old kernel(3.10) with
OBS(opensuse build service).

Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2017-09-06 19:56:42 +02:00
NeilBrown f856dc36b6 rbd: use bio_clone_fast() instead of bio_clone()
bio_clone() makes a copy of the bi_io_vec, but rbd never changes that,
so there is no need for a copy.
bio_clone_fast() can be used instead, which avoids making the copy.

This requires that we provide a bio_set.  bio_clone() uses fs_bio_set,
but it isn't, in general, safe to use the same bio_set at different
levels of the stack, as that can lead to deadlocks.  As filesystems
use fs_bio_set, block devices shouldn't.

As rbd never stacks, it is safe to have a single global bio_set for
all rbd devices to use.  So allocate that when the module is
initialised, and use it with bio_clone_fast().

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2017-06-18 12:40:59 -06:00
Jens Axboe 8f66439eec Linux 4.12-rc5
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Merge tag 'v4.12-rc5' into for-4.13/block

We've already got a few conflicts and upcoming work depends on some of the
changes that have gone into mainline as regression fixes for this series.

Pull in 4.12-rc5 to resolve these conflicts and make it easier on down stream
trees to continue working on 4.13 changes.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2017-06-12 08:30:13 -06:00
Christoph Hellwig fc17b6534e blk-mq: switch ->queue_rq return value to blk_status_t
Use the same values for use for request completion errors as the return
value from ->queue_rq.  BLK_STS_RESOURCE is special cased to cause
a requeue, and all the others are completed as-is.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
2017-06-09 09:27:32 -06:00
Christoph Hellwig 2a842acab1 block: introduce new block status code type
Currently we use nornal Linux errno values in the block layer, and while
we accept any error a few have overloaded magic meanings.  This patch
instead introduces a new  blk_status_t value that holds block layer specific
status codes and explicitly explains their meaning.  Helpers to convert from
and to the previous special meanings are provided for now, but I suspect
we want to get rid of them in the long run - those drivers that have a
errno input (e.g. networking) usually get errnos that don't know about
the special block layer overloads, and similarly returning them to userspace
will usually return somethings that strictly speaking isn't correct
for file system operations, but that's left as an exercise for later.

For now the set of errors is a very limited set that closely corresponds
to the previous overloaded errno values, but there is some low hanging
fruite to improve it.

blk_status_t (ab)uses the sparse __bitwise annotations to allow for sparse
typechecking, so that we can easily catch places passing the wrong values.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
2017-06-09 09:27:32 -06:00
Ilya Dryomov 6ac56951dc rbd: implement REQ_OP_WRITE_ZEROES
Commit 93c1defedc ("rbd: remove the discard_zeroes_data flag")
explicitly didn't implement REQ_OP_WRITE_ZEROES for rbd, while the
following commit 48920ff2a5 ("block: remove the discard_zeroes_data
flag") dropped ->discard_zeroes_data in favor of REQ_OP_WRITE_ZEROES.

rbd does support efficient zeroing via CEPH_OSD_OP_ZERO opcode and will
release either some or all blocks depending on whether the zeroing
request is rbd_obj_bytes() aligned.  This is how we currently implement
discards, so REQ_OP_WRITE_ZEROES can be identical to REQ_OP_DISCARD for
now.  Caveats:

- REQ_NOUNMAP is ignored, but AFAICT that's true of at least two other
  current implementations - nvme and loop

- there is no ->write_zeroes_alignment and blk_bio_write_zeroes_split()
  is hence less helpful than blk_bio_discard_split(), but this can (and
  should) be fixed on the rbd side

In the future we will split these into two code paths to respect
REQ_NOUNMAP on zeroout and save on zeroing blocks that couldn't be
released on discard.

Fixes: 93c1defedc ("rbd: remove the discard_zeroes_data flag")
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jason Dillaman <dillaman@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
2017-05-29 11:18:01 +02:00
Linus Torvalds 26c5eaa132 The two main items are support for disabling automatic rbd exclusive
lock transfers from myself and the long awaited -ENOSPC handling series
 from Jeff.  The former will allow rbd users to take advantage of
 exclusive lock's built-in blacklist/break-lock functionality while
 staying in control of who owns the lock.  With the latter in place, we
 will abort filesystem writes on -ENOSPC instead of having them block
 indefinitely.
 
 Beyond that we've got the usual pile of filesystem fixes from Zheng,
 some refcount_t conversion patches from Elena and a patch for an
 ancient open() flags handling bug from Alexander.
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Merge tag 'ceph-for-4.12-rc1' of git://github.com/ceph/ceph-client

Pull ceph updates from Ilya Dryomov:
 "The two main items are support for disabling automatic rbd exclusive
  lock transfers from myself and the long awaited -ENOSPC handling
  series from Jeff.

  The former will allow rbd users to take advantage of exclusive lock's
  built-in blacklist/break-lock functionality while staying in control
  of who owns the lock. With the latter in place, we will abort
  filesystem writes on -ENOSPC instead of having them block
  indefinitely.

  Beyond that we've got the usual pile of filesystem fixes from Zheng,
  some refcount_t conversion patches from Elena and a patch for an
  ancient open() flags handling bug from Alexander"

* tag 'ceph-for-4.12-rc1' of git://github.com/ceph/ceph-client: (31 commits)
  ceph: fix memory leak in __ceph_setxattr()
  ceph: fix file open flags on ppc64
  ceph: choose readdir frag based on previous readdir reply
  rbd: exclusive map option
  rbd: return ResponseMessage result from rbd_handle_request_lock()
  rbd: kill rbd_is_lock_supported()
  rbd: support updating the lock cookie without releasing the lock
  rbd: store lock cookie
  rbd: ignore unlock errors
  rbd: fix error handling around rbd_init_disk()
  rbd: move rbd_unregister_watch() call into rbd_dev_image_release()
  rbd: move rbd_dev_destroy() call out of rbd_dev_image_release()
  ceph: when seeing write errors on an inode, switch to sync writes
  Revert "ceph: SetPageError() for writeback pages if writepages fails"
  ceph: handle epoch barriers in cap messages
  libceph: add an epoch_barrier field to struct ceph_osd_client
  libceph: abort already submitted but abortable requests when map or pool goes full
  libceph: allow requests to return immediately on full conditions if caller wishes
  libceph: remove req->r_replay_version
  ceph: make seeky readdir more efficient
  ...
2017-05-10 08:42:33 -07:00
Deepa Dinamani 1134e09100 fs: ceph: CURRENT_TIME with ktime_get_real_ts()
CURRENT_TIME is not y2038 safe.  The macro will be deleted and all the
references to it will be replaced by ktime_get_* apis.

struct timespec is also not y2038 safe.  Retain timespec for timestamp
representation here as ceph uses it internally everywhere.  These
references will be changed to use struct timespec64 in a separate patch.

The current_fs_time() api is being changed to use vfs struct inode* as
an argument instead of struct super_block*.

Set the new mds client request r_stamp field using ktime_get_real_ts()
instead of using current_fs_time().

Also, since r_stamp is used as mtime on the server, use timespec_trunc()
to truncate the timestamp, using the right granularity from the
superblock.

This api will be transitioned to be y2038 safe along with vfs.

Link: http://lkml.kernel.org/r/1491613030-11599-5-git-send-email-deepa.kernel@gmail.com
Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
M:	Ilya Dryomov <idryomov@gmail.com>
M:	"Yan, Zheng" <zyan@redhat.com>
M:	Sage Weil <sage@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2017-05-08 17:15:15 -07:00
Ilya Dryomov e010dd0ada rbd: exclusive map option
Support disabling automatic exclusive lock transfers to allow users
to be in charge of which node should own the lock while being able to
reuse exclusive lock's built-in blacklist/break-lock functionality.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jason Dillaman <dillaman@redhat.com>
2017-05-04 09:19:24 +02:00
Ilya Dryomov 3b77faa049 rbd: return ResponseMessage result from rbd_handle_request_lock()
Right now it's just 0, but "no automatic exclusive lock transfers" mode
code will need -EROFS.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jason Dillaman <dillaman@redhat.com>
2017-05-04 09:19:24 +02:00
Ilya Dryomov f9bebd5803 rbd: kill rbd_is_lock_supported()
Currently the exclusive lock is acquired only if the mapping is
writable, i.e. an image HEAD mapped in rw mode.  This means that we
don't acquire the lock for executing a read from a snapshot or an image
HEAD mapped in ro mode, even if lock_on_read is set.  This is somewhat
weird and inconsistent with "no automatic exclusive lock transfers"
mode, where the lock is acquired unconditionally.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jason Dillaman <dillaman@redhat.com>
2017-05-04 09:19:23 +02:00
Ilya Dryomov 14bb211d32 rbd: support updating the lock cookie without releasing the lock
As we no longer release the lock before potentially raising BLACKLISTED
in rbd_reregister_watch(), the "either locked or blacklisted" assert in
rbd_queue_workfn() needs to go: we can be both locked and blacklisted
at that point now.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jason Dillaman <dillaman@redhat.com>
2017-05-04 09:19:23 +02:00
Ilya Dryomov cbbfb0ff11 rbd: store lock cookie
In preparation for supporting set_cookie method (or rather set_cookie
fallback for older OSDs), store the lock cookie on lock and use it on
unlock instead of recalculating from rbd_dev->watch_cookie.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jason Dillaman <dillaman@redhat.com>
2017-05-04 09:19:23 +02:00
Ilya Dryomov bbead745d9 rbd: ignore unlock errors
Currently the lock_state is set to UNLOCKED (preventing further I/O),
but RELEASED_LOCK notification isn't sent.  Be consistent with userspace
and treat ceph_cls_unlock() errors as the image is unlocked.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jason Dillaman <dillaman@redhat.com>
2017-05-04 09:19:23 +02:00
Ilya Dryomov 5769ed0cb1 rbd: fix error handling around rbd_init_disk()
add_disk() takes an extra reference on disk->queue, which is put in
put_disk() -> disk_release().  Avoiding blk_cleanup_queue() (which also
puts the queue) until add_disk() sets GENHD_FL_UP works for the queue
itself, but leaks various queue internals.  Conditioning tag_set freeing
on GENHD_FL_UP is wrong too: all error paths after rbd_init_disk() leak
the tag_set.

Move the final "announce" steps out of rbd_dev_device_setup() so that
it can be unwound like any other function.  Leave "announce" steps to
do_rbd_add/remove().

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jason Dillaman <dillaman@redhat.com>
2017-05-04 09:19:23 +02:00
Ilya Dryomov fd22aef8b4 rbd: move rbd_unregister_watch() call into rbd_dev_image_release()
rbd_dev->disk tear down vs rbd_watch_cb() race shouldn't be a problem
anymore thanks to EXISTS and REMOVING checks in rbd_dev_update_size().
A similar race could occur on "rbd map", see commit 811c668877
("rbd: fix rbd map vs notify races").

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jason Dillaman <dillaman@redhat.com>
2017-05-04 09:19:23 +02:00
Ilya Dryomov 8b679ec525 rbd: move rbd_dev_destroy() call out of rbd_dev_image_release()
... to simplify error handling in do_rbd_add().

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jason Dillaman <dillaman@redhat.com>
2017-05-04 09:19:23 +02:00
Ilya Dryomov 74da4a0f57 libceph, ceph: always advertise all supported features
No reason to hide CephFS-specific features in the rbd case.  Recent
feature bits mix RADOS and CephFS-specific stuff together anyway.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2017-05-04 09:19:18 +02:00
Christoph Hellwig d6296d39e9 blk-mq: update ->init_request and ->exit_request prototypes
Remove the request_idx parameter, which can't be used safely now that we
support I/O schedulers with blk-mq.  Except for a superflous check in
mtip32xx it was unused anyway.

Also pass the tag_set instead of just the driver data - this allows drivers
to avoid some code duplication in a follow on cleanup.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
2017-05-02 07:52:08 -06:00
Christoph Hellwig 93c1defedc rbd: remove the discard_zeroes_data flag
rbd only supports discarding on large alignments, so the zeroing code
would always fall back to explicit writings of zeroes.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-08 11:25:38 -06:00
Eric Biggers f363b089be blk-mq: constify struct blk_mq_ops
Constify all instances of blk_mq_ops, as they are never modified.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
2017-03-31 08:28:58 -06:00
Ilya Dryomov 8767b293a4 rbd: supported_features bus attribute
... so that userspace can generate meaningful error messages and spell
out unsupported features that need to be disabled.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Sage Weil <sage@redhat.com>
2017-03-07 14:30:38 +01:00
Linus Torvalds b2deee2dc0 This time around we have:
- support for rbd data-pool feature, which enables rbd images on
   erasure-coded pools (myself).  CEPH_PG_MAX_SIZE has been bumped to
   allow erasure-coded profiles with k+m up to 32.
 
 - a patch for ceph_d_revalidate() performance regression introduced in
   4.9, along with some cleanups in the area (Jeff Layton)
 
 - a set of fixes for unsafe ->d_parent accesses in CephFS (Jeff Layton)
 
 - buffered reads are now processed in rsize windows instead of rasize
   windows (Andreas Gerstmayr).  The new default for rsize mount option
   is 64M.
 
 - ack vs commit distinction is gone, greatly simplifying ->fsync() and
   MOSDOpReply handling code (myself)
 
 Also a few filesystem bug fixes from Zheng, a CRUSH sync up (CRUSH
 computations are still serialized though) and several minor fixes and
 cleanups all over.
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Merge tag 'ceph-for-4.11-rc1' of git://github.com/ceph/ceph-client

Pull ceph updates from Ilya Dryomov:
 "This time around we have:

   - support for rbd data-pool feature, which enables rbd images on
     erasure-coded pools (myself). CEPH_PG_MAX_SIZE has been bumped to
     allow erasure-coded profiles with k+m up to 32.

   - a patch for ceph_d_revalidate() performance regression introduced
     in 4.9, along with some cleanups in the area (Jeff Layton)

   - a set of fixes for unsafe ->d_parent accesses in CephFS (Jeff
     Layton)

   - buffered reads are now processed in rsize windows instead of rasize
     windows (Andreas Gerstmayr). The new default for rsize mount option
     is 64M.

   - ack vs commit distinction is gone, greatly simplifying ->fsync()
     and MOSDOpReply handling code (myself)

  ... also a few filesystem bug fixes from Zheng, a CRUSH sync up (CRUSH
  computations are still serialized though) and several minor fixes and
  cleanups all over"

* tag 'ceph-for-4.11-rc1' of git://github.com/ceph/ceph-client: (52 commits)
  libceph, rbd, ceph: WRITE | ONDISK -> WRITE
  libceph: get rid of ack vs commit
  ceph: remove special ack vs commit behavior
  ceph: tidy some white space in get_nonsnap_parent()
  crush: fix dprintk compilation
  crush: do is_out test only if we do not collide
  ceph: remove req from unsafe list when unregistering it
  rbd: constify device_type structure
  rbd: kill obj_request->object_name and rbd_segment_name_cache
  rbd: store and use obj_request->object_no
  rbd: RBD_V{1,2}_DATA_FORMAT macros
  rbd: factor out __rbd_osd_req_create()
  rbd: set offset and length outside of rbd_obj_request_create()
  rbd: support for data-pool feature
  rbd: introduce rbd_init_layout()
  rbd: use rbd_obj_bytes() more
  rbd: remove now unused rbd_obj_request_wait() and helpers
  rbd: switch rbd_obj_method_sync() to ceph_osdc_call()
  libceph: pass reply buffer length through ceph_osdc_call()
  rbd: do away with obj_request in rbd_obj_read_sync()
  ...
2017-02-28 15:36:09 -08:00
Ilya Dryomov 54ea0046b6 libceph, rbd, ceph: WRITE | ONDISK -> WRITE
CEPH_OSD_FLAG_ONDISK is set in account_request().

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Reviewed-by: Sage Weil <sage@redhat.com>
2017-02-24 19:04:57 +01:00
Linus Torvalds 772c8f6f3b for-4.11/linus-merge-signed
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Merge tag 'for-4.11/linus-merge-signed' of git://git.kernel.dk/linux-block

Pull block layer updates from Jens Axboe:

 - blk-mq scheduling framework from me and Omar, with a port of the
   deadline scheduler for this framework. A port of BFQ from Paolo is in
   the works, and should be ready for 4.12.

 - Various fixups and improvements to the above scheduling framework
   from Omar, Paolo, Bart, me, others.

 - Cleanup of the exported sysfs blk-mq data into debugfs, from Omar.
   This allows us to export more information that helps debug hangs or
   performance issues, without cluttering or abusing the sysfs API.

 - Fixes for the sbitmap code, the scalable bitmap code that was
   migrated from blk-mq, from Omar.

 - Removal of the BLOCK_PC support in struct request, and refactoring of
   carrying SCSI payloads in the block layer. This cleans up the code
   nicely, and enables us to kill the SCSI specific parts of struct
   request, shrinking it down nicely. From Christoph mainly, with help
   from Hannes.

 - Support for ranged discard requests and discard merging, also from
   Christoph.

 - Support for OPAL in the block layer, and for NVMe as well. Mainly
   from Scott Bauer, with fixes/updates from various others folks.

 - Error code fixup for gdrom from Christophe.

 - cciss pci irq allocation cleanup from Christoph.

 - Making the cdrom device operations read only, from Kees Cook.

 - Fixes for duplicate bdi registrations and bdi/queue life time
   problems from Jan and Dan.

 - Set of fixes and updates for lightnvm, from Matias and Javier.

 - A few fixes for nbd from Josef, using idr to name devices and a
   workqueue deadlock fix on receive. Also marks Josef as the current
   maintainer of nbd.

 - Fix from Josef, overwriting queue settings when the number of
   hardware queues is updated for a blk-mq device.

 - NVMe fix from Keith, ensuring that we don't repeatedly mark and IO
   aborted, if we didn't end up aborting it.

 - SG gap merging fix from Ming Lei for block.

 - Loop fix also from Ming, fixing a race and crash between setting loop
   status and IO.

 - Two block race fixes from Tahsin, fixing request list iteration and
   fixing a race between device registration and udev device add
   notifiations.

 - Double free fix from cgroup writeback, from Tejun.

 - Another double free fix in blkcg, from Hou Tao.

 - Partition overflow fix for EFI from Alden Tondettar.

* tag 'for-4.11/linus-merge-signed' of git://git.kernel.dk/linux-block: (156 commits)
  nvme: Check for Security send/recv support before issuing commands.
  block/sed-opal: allocate struct opal_dev dynamically
  block/sed-opal: tone down not supported warnings
  block: don't defer flushes on blk-mq + scheduling
  blk-mq-sched: ask scheduler for work, if we failed dispatching leftovers
  blk-mq: don't special case flush inserts for blk-mq-sched
  blk-mq-sched: don't add flushes to the head of requeue queue
  blk-mq: have blk_mq_dispatch_rq_list() return if we queued IO or not
  block: do not allow updates through sysfs until registration completes
  lightnvm: set default lun range when no luns are specified
  lightnvm: fix off-by-one error on target initialization
  Maintainers: Modify SED list from nvme to block
  Move stack parameters for sed_ioctl to prevent oversized stack with CONFIG_KASAN
  uapi: sed-opal fix IOW for activate lsp to use correct struct
  cdrom: Make device operations read-only
  elevator: fix loading wrong elevator type for blk-mq devices
  cciss: switch to pci_irq_alloc_vectors
  block/loop: fix race between I/O and set_status
  blk-mq-sched: don't hold queue_lock when calling exit_icq
  block: set make_request_fn manually in blk_mq_update_nr_hw_queues
  ...
2017-02-21 10:57:33 -08:00
Bhumika Goyal b9942bc9d3 rbd: constify device_type structure
Declare device_type structure as const as it is only stored in the
type field of a device structure. This field is of type const, so add
const to the declaration of device_type structure.

File size before:
   text	   data	    bss	    dec	    hex	filename
  61546	  11610	    208	  73364	  11e94	drivers/block/rbd.o

File size after:
   text	   data	    bss	    dec	    hex	filename
  61610	  11578	    208	  73396	  11eb4	drivers/block/rbd.o

Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2017-02-20 13:06:02 +01:00
Ilya Dryomov 6c696d8560 rbd: kill obj_request->object_name and rbd_segment_name_cache
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jason Dillaman <dillaman@redhat.com>
2017-02-20 12:16:15 +01:00
Ilya Dryomov a90bb0c1d4 rbd: store and use obj_request->object_no
object_no can be trivially formatted into an object name.  We already
store object names in OSD requests with special care to avoid dynamic
allocations for short names.  Storing a name in obj_request, obtained
as below (!), is a waste and will be removed in the next commit.

    name = kmem_cache_alloc(rbd_segment_name_cache, ...);
    snprintf(name, ...);
    obj_request->object_name = kstrdup(name);
    kmem_cache_free(rbd_segment_name_cache, name);
    ...
    ceph_oid_aprintf(..., "%s", obj_request->object_name);

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jason Dillaman <dillaman@redhat.com>
2017-02-20 12:16:15 +01:00
Ilya Dryomov 223768d02e rbd: RBD_V{1,2}_DATA_FORMAT macros
... and also fix up the comment -- format 1 data objects have always
been 12 hex digits long.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jason Dillaman <dillaman@redhat.com>
2017-02-20 12:16:15 +01:00
Ilya Dryomov bc81207ea9 rbd: factor out __rbd_osd_req_create()
Factor OSD request allocation and initialization code out into
__rbd_osd_req_create().

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jason Dillaman <dillaman@redhat.com>
2017-02-20 12:16:15 +01:00
Ilya Dryomov 67e2b65274 rbd: set offset and length outside of rbd_obj_request_create()
The allocation doesn't depend on offset and length.  Both offset and
length can be changed after obj_request is allocated, too.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jason Dillaman <dillaman@redhat.com>
2017-02-20 12:16:14 +01:00
Ilya Dryomov 7e97332ea9 rbd: support for data-pool feature
Add support for RBD_FEATURE_DATA_POOL feature.  rbd_dev->layout.pool_id
now stores the data pool id.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jason Dillaman <dillaman@redhat.com>
2017-02-20 12:16:14 +01:00
Ilya Dryomov 263423f8ad rbd: introduce rbd_init_layout()
Rather than initializing layout fields with some made up values in
__rbd_dev_create(), move the initialization into rbd_init_layout() and
call it after the header is actually populated.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jason Dillaman <dillaman@redhat.com>
2017-02-20 12:16:14 +01:00
Ilya Dryomov 5bc3fb1775 rbd: use rbd_obj_bytes() more
Returning u64 doesn't make sense: max header->obj_order is 25 and
ceph_file_layout::object_size is u32.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jason Dillaman <dillaman@redhat.com>
2017-02-20 12:16:14 +01:00
Ilya Dryomov 03acf08335 rbd: remove now unused rbd_obj_request_wait() and helpers
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jason Dillaman <dillaman@redhat.com>
2017-02-20 12:16:14 +01:00
Ilya Dryomov ecd4a68a26 rbd: switch rbd_obj_method_sync() to ceph_osdc_call()
As explained in the previous commit, rbd_obj_request machinery (and
rbd_osd_req_create() in particular) shouldn't be used for working with
metadata objects.

Switch to the recently added ceph_osdc_call().  It assumes single pages
for outbound and inbound buffers, but that's OK - none of the callers
need more than that.  These pages need to be allocated (messenger is in
dire need of proper iterator interface!), but we are swapping for
pages[] and pagelist allocations in the existing code.

Kill class_name argument - all rbd methods are under "rbd".

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jason Dillaman <dillaman@redhat.com>
2017-02-20 12:16:13 +01:00
Ilya Dryomov fe5478e0f6 rbd: do away with obj_request in rbd_obj_read_sync()
rbd_obj_request machinery is completely unnecessary here; all that's
being done is fetching a metadata object - no striping, cloning, etc.
More importantly, rbd_osd_req_create() grabs pool id from layout and
that is becoming a data pool id.

Kill offset argument - all metadata objects are small and read in full.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jason Dillaman <dillaman@redhat.com>
2017-02-20 12:16:12 +01:00
Ilya Dryomov 431a02cd82 rbd: initialize rbd_dev->header_oloc early
No reason to delay it until image_id is known.  This will be required
by some rbd_obj_method_sync() callers, after rbd_obj_method_sync() is
changed to take oloc.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jason Dillaman <dillaman@redhat.com>
2017-02-20 12:16:12 +01:00
Ilya Dryomov 24dca799fd rbd: kill rbd_image_header::{crypt_type,comp_type}
Image format 1 is deprecated and format 2 doesn't have these.  Also,
__rbd_dev_create() takes care of zeroing (or otherwise initializing)
format 2 specific fields.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jason Dillaman <dillaman@redhat.com>
2017-02-20 12:16:12 +01:00
Ilya Dryomov 848d796c8c rbd: use kstrndup() in rbd_header_from_disk()
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jason Dillaman <dillaman@redhat.com>
2017-02-20 12:16:11 +01:00
Jan Kara dc3b17cc8b block: Use pointer to backing_dev_info from request_queue
We will want to have struct backing_dev_info allocated separately from
struct request_queue. As the first step add pointer to backing_dev_info
to request_queue and convert all users touching it. No functional
changes in this patch.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@fb.com>
2017-02-02 08:20:48 -07:00
Christoph Hellwig aebf526b53 block: fold cmd_type into the REQ_OP_ space
Instead of keeping two levels of indirection for requests types, fold it
all into the operations.  The little caveat here is that previously
cmd_type only applied to struct request, while the request and bio op
fields were set to plain REQ_OP_READ/WRITE even for passthrough
operations.

Instead this patch adds new REQ_OP_* for SCSI passthrough and driver
private requests, althought it has to add two for each so that we
can communicate the data in/out nature of the request.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
2017-01-31 14:00:44 -07:00
Peter Zijlstra 2c935bc572 locking/atomic, kref: Add kref_read()
Since we need to change the implementation, stop exposing internals.

Provide kref_read() to read the current reference count; typically
used for debug messages.

Kills two anti-patterns:

	atomic_read(&kref->refcount)
	kref->refcount.counter

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-01-14 11:37:18 +01:00
Ilya Dryomov d4c2269b3d rbd: silence bogus -Wmaybe-uninitialized warning
drivers/block/rbd.c: In function ‘rbd_watch_cb’:
drivers/block/rbd.c:3690:5: error: ‘struct_v’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
drivers/block/rbd.c:3759:5: note: ‘struct_v’ was declared here

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-12-12 23:54:26 +01:00
Ilya Dryomov 4d73644bc3 rbd: don't retry watch reregistration if header object is gone
If the header object gets deleted (perhaps along with the entire pool),
there is no point in attempting to reregister the watch.  Treat this
the same as blacklisting: fail all pending and new I/Os requiring the
lock.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-10-15 23:22:09 +02:00
Ilya Dryomov 87c0fded85 rbd: don't wait for the lock forever if blacklisted
-EBLACKLISTED from __rbd_register_watch() means that our ceph_client
got blacklisted - we won't be able to restore the watch and reacquire
the lock.  Wake up and fail all outstanding requests waiting for the
lock and arrange for all new requests that require the lock to fail
immediately.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Tested-by: Mike Christie <mchristi@redhat.com>
2016-10-15 23:21:56 +02:00
Linus Torvalds 8dfb790b15 The big ticket item here is support for rbd exclusive-lock feature,
with maintenance operations offloaded to userspace (Douglas Fuller,
 Mike Christie and myself).  Another block device bullet is a series
 fixing up layering error paths (myself).
 
 On the filesystem side, we've got patches that improve our handling of
 buffered vs dio write races (Neil Brown) and a few assorted fixes from
 Zheng.  Also included a couple of random cleanups and a minor CRUSH
 update.
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Merge tag 'ceph-for-4.9-rc1' of git://github.com/ceph/ceph-client

Pull Ceph updates from Ilya Dryomov:
 "The big ticket item here is support for rbd exclusive-lock feature,
  with maintenance operations offloaded to userspace (Douglas Fuller,
  Mike Christie and myself). Another block device bullet is a series
  fixing up layering error paths (myself).

  On the filesystem side, we've got patches that improve our handling of
  buffered vs dio write races (Neil Brown) and a few assorted fixes from
  Zheng. Also included a couple of random cleanups and a minor CRUSH
  update"

* tag 'ceph-for-4.9-rc1' of git://github.com/ceph/ceph-client: (39 commits)
  crush: remove redundant local variable
  crush: don't normalize input of crush_ln iteratively
  libceph: ceph_build_auth() doesn't need ceph_auth_build_hello()
  libceph: use CEPH_AUTH_UNKNOWN in ceph_auth_build_hello()
  ceph: fix description for rsize and rasize mount options
  rbd: use kmalloc_array() in rbd_header_from_disk()
  ceph: use list_move instead of list_del/list_add
  ceph: handle CEPH_SESSION_REJECT message
  ceph: avoid accessing / when mounting a subpath
  ceph: fix mandatory flock check
  ceph: remove warning when ceph_releasepage() is called on dirty page
  ceph: ignore error from invalidate_inode_pages2_range() in direct write
  ceph: fix error handling of start_read()
  rbd: add rbd_obj_request_error() helper
  rbd: img_data requests don't own their page array
  rbd: don't call rbd_osd_req_format_read() for !img_data requests
  rbd: rework rbd_img_obj_exists_submit() error paths
  rbd: don't crash or leak on errors in rbd_img_obj_parent_read_full_callback()
  rbd: move bumping img_request refcount into rbd_obj_request_submit()
  rbd: mark the original request as done if stat request fails
  ...
2016-10-10 13:52:05 -07:00
Markus Elfring 88a25a5fa0 rbd: use kmalloc_array() in rbd_header_from_disk()
* A multiplication for the size determination of a memory allocation
  indicated that an array data structure should be processed.
  Thus use the corresponding function "kmalloc_array".

  This issue was detected by using the Coccinelle software.

* Delete the local variable "size" which became unnecessary with
  this refactoring.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-10-03 16:13:50 +02:00
Ilya Dryomov 0dcc685e7d rbd: add rbd_obj_request_error() helper
Pull setting an error and marking a request done code into a new
helper.  obj_request_img_data_test() check isn't strictly needed right
now, but makes it applicable to !img_data requests and a bit safer.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-10-03 16:13:49 +02:00
Ilya Dryomov 04dc923c9e rbd: img_data requests don't own their page array
Move the check into rbd_obj_request_destroy() to avoid use-after-free
on errors in rbd_img_request_fill(..., OBJ_REQUEST_PAGES, ...), where
pages, owned by the caller, gets freed in rbd_img_request_fill().

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Alex Elder <elder@linaro.org>
Reviewed-by: David Disseldorp <ddiss@suse.de>
2016-10-03 16:13:49 +02:00
Ilya Dryomov 7c84883adf rbd: don't call rbd_osd_req_format_read() for !img_data requests
Accessing obj_request->img_request union field is only valid for object
requests associated with an image (i.e. if obj_request_img_data_test()
returns true).  rbd_osd_req_format_read() used to do more, but now it
just sets osd_req->snap_id.  Standalone and stat object requests always
go to the HEAD revision and are fine with CEPH_NOSNAP set by libceph,
so get around the invalid union field use by simply not calling
rbd_osd_req_format_read() in those places.

Reported-by: David Disseldorp <ddiss@suse.de>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Alex Elder <elder@linaro.org>
Reviewed-by: David Disseldorp <ddiss@suse.de>
2016-10-03 16:13:49 +02:00
Ilya Dryomov 710214e391 rbd: rework rbd_img_obj_exists_submit() error paths
- don't put obj_request before rbd_obj_request_get() if
  rbd_obj_request_create() fails
- don't leak pages if rbd_obj_request_create() fails
- don't leak stat_request if rbd_osd_req_create() fails

Reported-by: David Disseldorp <ddiss@suse.de>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Alex Elder <elder@linaro.org>
Reviewed-by: David Disseldorp <ddiss@suse.de>
2016-10-03 16:13:48 +02:00
Ilya Dryomov fa355112c2 rbd: don't crash or leak on errors in rbd_img_obj_parent_read_full_callback()
- fix parent_length == img_request->xferred assert to not fire on
  copyup read failures
- don't leak pages if copyup read fails or we can't allocate a new osd
  request

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Alex Elder <elder@linaro.org>
Reviewed-by: David Disseldorp <ddiss@suse.de>
2016-10-03 16:13:48 +02:00
Ilya Dryomov 4a17dadcae rbd: move bumping img_request refcount into rbd_obj_request_submit()
Commit 0f2d5be792 ("rbd: use reference counts for image requests")
added rbd_img_request_get(), which rbd_img_request_fill() calls for
each obj_request added to img_request.  It was an urgent band-aid for
the uglyness that is rbd_img_obj_callback() and none of the error paths
were updated.

Given that this img_request reference is meant to represent an
obj_request that hasn't passed through rbd_img_obj_callback() yet,
proper cleanup in appropriate destructors is a challenge.  However,
noting that if we don't get a chance to call rbd_obj_request_complete(),
there is not going to be a call to rbd_img_obj_callback(), we can move
rbd_img_request_get() into rbd_obj_request_submit() and fixup the two
places that call rbd_obj_request_complete() directly and not through
rbd_obj_request_submit() to temporarily bump img_request, so that
rbd_img_obj_callback() can put as usual.

This takes care of img_request leaks on errors on the submit side.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Alex Elder <elder@linaro.org>
2016-10-03 16:13:47 +02:00
Ilya Dryomov c2e8241488 rbd: mark the original request as done if stat request fails
If stat request fails with something other than -ENOENT (which just
means that we need to copyup), the original object request is never
marked as done and therefore never completed.  Fix this by moving the
mark done + complete snippet from rbd_img_obj_parent_read_full() into
rbd_img_obj_exists_callback().  The former remains covered, as the
latter is its only caller (through rbd_img_obj_request_submit()).

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Alex Elder <elder@linaro.org>
Reviewed-by: David Disseldorp <ddiss@suse.de>
2016-10-03 16:13:47 +02:00
Ilya Dryomov 058aa99191 rbd: clean up asserts in rbd_img_obj_request_submit() helpers
Assert once in rbd_img_obj_request_submit().

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Alex Elder <elder@linaro.org>
Reviewed-by: David Disseldorp <ddiss@suse.de>
2016-10-03 16:13:47 +02:00
Ilya Dryomov 980917fc6e rbd: change rbd_obj_request_submit() signature
- osdc parameter is useless
- starting with commit 5aea3dcd50 ("libceph: a major OSD client
  update"), ceph_osdc_start_request() always returns success

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Alex Elder <elder@linaro.org>
Reviewed-by: David Disseldorp <ddiss@suse.de>
2016-10-03 16:13:47 +02:00
Ilya Dryomov 80de191228 rbd: lock_on_read map option
Add a per-device option to acquire exclusive lock on reads (in addition
to writes and discards).  The use case is iSCSI, where it will be used
to prevent execution of stale writes after the implicit failover.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Tested-by: Mike Christie <mchristi@redhat.com>
2016-10-03 16:13:47 +02:00
Christoph Hellwig 7d7e0f90b7 blk-mq: remove ->map_queue
All drivers use the default, so provide an inline version of it.  If we
ever need other queue mapping we can add an optional method back,
although supporting will also require major changes to the queue setup
code.

This provides better code generation, and better debugability as well.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
2016-09-15 08:42:03 -06:00
Mike Christie 0276dca6c1 rbd: add force close option
This adds a force close option, so we can force the unmapping
of a rbd device that is open. If a path/device is blacklisted, apps
like multipathd can map a new device and then unmap the old one.
The unmapping cleanup would then be handled by the generic hotunplug
code paths in multipahd like is done for iSCSI, FC/FCOE, SAS, etc.

Signed-off-by: Mike Christie <mchristi@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-08-24 23:49:17 +02:00
Mike Christie 0d6d1e9c2e rbd: add 'config_info' sysfs rbd device attribute
Export the info used to setup the rbd image, so it can be used to remap
the image.

Signed-off-by: Mike Christie <mchristi@redhat.com>
[idryomov@gmail.com: do_rbd_add() EH]
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-08-24 23:49:17 +02:00
Mike Christie 92a5867154 rbd: add 'snap_id' sysfs rbd device attribute
Export snap id in sysfs, so tools like multipathd can use it in a uuid.

Signed-off-by: Mike Christie <mchristi@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-08-24 23:49:17 +02:00
Mike Christie 267fb90b83 rbd: add 'cluster_fsid' sysfs rbd device attribute
Export the cluster fsid, so tools like udev and multipath-tools can use
it for part of the uuid.

Signed-off-by: Mike Christie <mchristi@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-08-24 23:49:16 +02:00
Ilya Dryomov 005a07bf0a rbd: add 'client_addr' sysfs rbd device attribute
Export client addr/nonce, so userspace can check if a image is being
blacklisted.

Signed-off-by: Mike Christie <mchristi@redhat.com>
[idryomov@gmail.com: ceph_client_addr(), endianess fix]
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-08-24 23:49:16 +02:00
Ilya Dryomov ca7909e8bb rbd: print capacity in decimal and features in hex
With exclusive-lock added and more to come, print features into dmesg.
Change capacity to decimal while at it.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Mike Christie <mchristi@redhat.com>
2016-08-24 23:49:16 +02:00
Ilya Dryomov ed95b21a4b rbd: support for exclusive-lock feature
Add basic support for RBD_FEATURE_EXCLUSIVE_LOCK feature.  Maintenance
operations (resize, snapshot create, etc) are offloaded to librbd via
returning -EOPNOTSUPP - librbd should request the lock and execute the
operation.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Mike Christie <mchristi@redhat.com>
Tested-by: Mike Christie <mchristi@redhat.com>
2016-08-24 23:49:16 +02:00
Ilya Dryomov 99d1694310 rbd: retry watch re-registration periodically
Revamp watch code to support retrying watch re-registration:

- add rbd_dev->watch_state for more robust errcb handling
- store watch cookie separately to avoid dereferencing watch_handle
  which is set to NULL on unwatch
- move re-register code into a delayed work and retry re-registration
  every second, unless the client is blacklisted

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Mike Christie <mchristi@redhat.com>
Tested-by: Mike Christie <mchristi@redhat.com>
2016-08-24 23:49:16 +02:00
Ilya Dryomov 1643dfa4c2 rbd: introduce a per-device ordered workqueue
This is going to be used for re-registering watch requests and
exclusive-lock tasks: acquire/request lock, notify-acquired, release
lock, notify-released.  Some refactoring in the map/unmap paths was
necessary to give this workqueue a meaningful name: "rbdX-tasks".

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Mike Christie <mchristi@redhat.com>
2016-08-24 23:49:16 +02:00
Ilya Dryomov 033268a5f0 libceph: rename ceph_client_id() -> ceph_client_gid()
It's gid / global_id in other places.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Mike Christie <mchristi@redhat.com>
Reviewed-by: Alex Elder <elder@linaro.org>
2016-08-24 23:49:16 +02:00
Ilya Dryomov d8734849d8 rbd: nuke the 32-bit pool id check
ceph_file_layout::pool_id is now s64.  rbd_add_get_pool_id() and
ceph_pg_poolid_by_name() both return an int, so it's bogus anyway.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Alex Elder <elder@linaro.org>
2016-08-09 17:26:47 +02:00
Ilya Dryomov 6b6dddbe11 rbd: destroy header_oloc in rbd_dev_release()
Purely cosmetic at this point, as rbd doesn't use RADOS namespaces and
hence rbd_dev->header_oloc->pool_ns is always NULL.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-08-08 21:41:44 +02:00
Linus Torvalds 72b5ac54d6 The highlights are:
* RADOS namespace support in libceph and CephFS (Zheng Yan and myself).
    The stopgaps added in 4.5 to deny access to inodes in namespaces are
    removed and CEPH_FEATURE_FS_FILE_LAYOUT_V2 feature bit is now fully
    supported.
 
  * A large rework of the MDS cap flushing code (Zheng Yan).
 
  * Handle some of ->d_revalidate() in RCU mode (Jeff Layton).  We were
    overly pessimistic before, bailing at the first sight of LOOKUP_RCU.
 
 On top of that we've got a few CephFS bug fixes, a couple of cleanups
 and Arnd's workaround for a weird genksyms issue.
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Merge tag 'ceph-for-4.8-rc1' of git://github.com/ceph/ceph-client

Pull Ceph updates from Ilya Dryomov:
 "The highlights are:

   - RADOS namespace support in libceph and CephFS (Zheng Yan and
     myself).  The stopgaps added in 4.5 to deny access to inodes in
     namespaces are removed and CEPH_FEATURE_FS_FILE_LAYOUT_V2 feature
     bit is now fully supported

   - A large rework of the MDS cap flushing code (Zheng Yan)

   - Handle some of ->d_revalidate() in RCU mode (Jeff Layton).  We were
     overly pessimistic before, bailing at the first sight of LOOKUP_RCU

  On top of that we've got a few CephFS bug fixes, a couple of cleanups
  and Arnd's workaround for a weird genksyms issue"

* tag 'ceph-for-4.8-rc1' of git://github.com/ceph/ceph-client: (34 commits)
  ceph: fix symbol versioning for ceph_monc_do_statfs
  ceph: Correctly return NXIO errors from ceph_llseek
  ceph: Mark the file cache as unreclaimable
  ceph: optimize cap flush waiting
  ceph: cleanup ceph_flush_snaps()
  ceph: kick cap flushes before sending other cap message
  ceph: introduce an inode flag to indicates if snapflush is needed
  ceph: avoid sending duplicated cap flush message
  ceph: unify cap flush and snapcap flush
  ceph: use list instead of rbtree to track cap flushes
  ceph: update types of some local varibles
  ceph: include 'follows' of pending snapflush in cap reconnect message
  ceph: update cap reconnect message to version 3
  ceph: mount non-default filesystem by name
  libceph: fsmap.user subscription support
  ceph: handle LOOKUP_RCU in ceph_d_revalidate
  ceph: allow dentry_lease_is_valid to work under RCU walk
  ceph: clear d_fsinfo pointer under d_lock
  ceph: remove ceph_mdsc_lease_release
  ceph: don't use ->d_time
  ...
2016-08-02 19:39:09 -04:00
Yan, Zheng 30c156d995 libceph: rados pool namespace support
Add pool namesapce pointer to struct ceph_file_layout and struct
ceph_object_locator. Pool namespace is used by when mapping object
to PG, it's also used when composing OSD request.

The namespace pointer in struct ceph_file_layout is RCU protected.
So libceph can read namespace without taking lock.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
[idryomov@gmail.com: ceph_oloc_destroy(), misc minor changes]
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-07-28 02:55:37 +02:00
Yan, Zheng 7627151ea3 libceph: define new ceph_file_layout structure
Define new ceph_file_layout structure and rename old ceph_file_layout
to ceph_file_layout_legacy. This is preparation for adding namespace
to ceph_file_layout structure.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
2016-07-28 02:55:36 +02:00
Mike Christie c2df40dfb8 drivers: use req op accessor
The req operation REQ_OP is separated from the rq_flag_bits
definition. This converts the block layer drivers to
use req_op to get the op from the request struct.

Signed-off-by: Mike Christie <mchristi@redhat.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
2016-06-07 13:41:38 -06:00
Ilya Dryomov 7cca78c9dc libceph: replace ceph_monc_request_next_osdmap()
... with a wrapper around maybe_request_map() - no need for two
osdmap-specific functions.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-05-26 01:15:30 +02:00
Ilya Dryomov d0b19705e9 libceph: async MON client generic requests
For map check, we are going to need to send CEPH_MSG_MON_GET_VERSION
messages asynchronously and get a callback on completion.  Refactor MON
client to allow firing off generic requests asynchronously and add an
async variant of ceph_monc_get_version().  ceph_monc_do_statfs() is
switched over and remains sync.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-05-26 01:15:29 +02:00
Ilya Dryomov 922dab6134 libceph, rbd: ceph_osd_linger_request, watch/notify v2
This adds support and switches rbd to a new, more reliable version of
watch/notify protocol.  As with the OSD client update, this is mostly
about getting the right structures linked into the right places so that
reconnects are properly sent when needed.  watch/notify v2 also
requires sending regular pings to the OSDs - send_linger_ping().

A major change from the old watch/notify implementation is the
introduction of ceph_osd_linger_request - linger requests no longer
piggy back on ceph_osd_request.  ceph_osd_event has been merged into
ceph_osd_linger_request.

All the details are now hidden within libceph, the interface consists
of a simple pair of watch/unwatch functions and ceph_osdc_notify_ack().
ceph_osdc_watch() does return ceph_osd_linger_request, but only to keep
the lifetime management simple.

ceph_osdc_notify_ack() accepts an optional data payload, which is
relayed back to the notifier.

Portions of this patch are loosely based on work by Douglas Fuller
<dfuller@redhat.com> and Mike Christie <michaelc@cs.wisc.edu>.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-05-26 01:15:02 +02:00
Ilya Dryomov c525f03601 rbd: rbd_dev_header_unwatch_sync() variant
Introduce __rbd_dev_header_unwatch_sync(), which doesn't flush notify
callbacks.  This is for the new rados_watcherrcb_t, which would be
called from a notify callback.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-05-26 01:14:06 +02:00
Ilya Dryomov 85e084feb4 libceph: drop msg argument from ceph_osdc_callback_t
finish_read(), its only user, uses it to get to hdr.data_len, which is
what ->r_result is set to on success.  This gains us the ability to
safely call callbacks from contexts other than reply, e.g. map check.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-05-26 00:36:27 +02:00
Ilya Dryomov bb873b5391 libceph: switch to calc_target(), part 2
The crux of this is getting rid of ceph_osdc_build_request(), so that
MOSDOp can be encoded not before but after calc_target() calculates the
actual target.  Encoding now happens within ceph_osdc_start_request().

Also nuked is the accompanying bunch of pointers into the encoded
buffer that was used to update fields on each send - instead, the
entire front is re-encoded.  If we want to support target->name_len !=
base->name_len in the future, there is no other way, because oid is
surrounded by other fields in the encoded buffer.

Encoding OSD ops and adding data items to the request message were
mixed together in osd_req_encode_op().  While we want to re-encode OSD
ops, we don't want to add duplicate data items to the message when
resending, so all call to ceph_osdc_msg_data_add() are factored out
into a new setup_request_data().

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-05-26 00:36:27 +02:00
Ilya Dryomov c41d13a31f rbd: use header_oid instead of header_name
Switch to ceph_object_id and use ceph_oid_aprintf() instead of a bare
const char *.  This reduces noise in rbd_dev_header_name().

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-05-26 00:36:22 +02:00
Ilya Dryomov d30291b985 libceph: variable-sized ceph_object_id
Currently ceph_object_id can hold object names of up to 100
(CEPH_MAX_OID_NAME_LEN) characters.  This is enough for all use cases,
expect one - long rbd image names:

- a format 1 header is named "<imgname>.rbd"
- an object that points to a format 2 header is named "rbd_id.<imgname>"

We operate on these potentially long-named objects during rbd map, and,
for format 1 images, during header refresh.  (A format 2 header name is
a small system-generated string.)

Lift this 100 character limit by making ceph_object_id be able to point
to an externally-allocated string.  Apart from being able to work with
almost arbitrarily-long named objects, this allows us to reduce the
size of ceph_object_id from >100 bytes to 64 bytes.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-05-26 00:36:22 +02:00
Ilya Dryomov 13d1ad16d0 libceph: move message allocation out of ceph_osdc_alloc_request()
The size of ->r_request and ->r_reply messages depends on the size of
the object name (ceph_object_id), while the size of ceph_osd_request is
fixed.  Move message allocation into a separate function that would
have to be called after ceph_object_id and ceph_object_locator (which
is also going to become variable in size with RADOS namespaces) have
been filled in:

    req = ceph_osdc_alloc_request(...);
    <fill in req->r_base_oid>
    <fill in req->r_base_oloc>
    ceph_osdc_alloc_messages(req);

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-05-26 00:36:21 +02:00
Ilya Dryomov 663ae2cc04 rbd: get/put img_request in rbd_img_request_submit()
By the time we get to checking for_each_obj_request_safe(img_request)
terminating condition, all obj_requests may be complete and img_request
ref, that rbd_img_request_submit() takes away from its caller, may be
put.  Moving the next_obj_request cursor is then a use-after-free on
img_request.

It's totally benign, as the value that's read is never used, but
I think it's still worth fixing.

Cc: Alex Elder <elder@linaro.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-05-26 00:36:20 +02:00
Ilya Dryomov d3767f0fae rbd: report unsupported features to syslog
... instead of just returning an error.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Josh Durgin <jdurgin@redhat.com>
2016-04-28 10:07:43 +02:00
Ilya Dryomov 811c668877 rbd: fix rbd map vs notify races
A while ago, commit 9875201e10 ("rbd: fix use-after free of
rbd_dev->disk") fixed rbd unmap vs notify race by introducing
an exported wrapper for flushing notifies and sticking it into
do_rbd_remove().

A similar problem exists on the rbd map path, though: the watch is
registered in rbd_dev_image_probe(), while the disk is set up quite
a few steps later, in rbd_dev_device_setup().  Nothing prevents
a notify from coming in and crashing on a NULL rbd_dev->disk:

    BUG: unable to handle kernel NULL pointer dereference at 0000000000000050
    Call Trace:
     [<ffffffffa0508344>] rbd_watch_cb+0x34/0x180 [rbd]
     [<ffffffffa04bd290>] do_event_work+0x40/0xb0 [libceph]
     [<ffffffff8109d5db>] process_one_work+0x17b/0x470
     [<ffffffff8109e3ab>] worker_thread+0x11b/0x400
     [<ffffffff8109e290>] ? rescuer_thread+0x400/0x400
     [<ffffffff810a5acf>] kthread+0xcf/0xe0
     [<ffffffff810b41b3>] ? finish_task_switch+0x53/0x170
     [<ffffffff810a5a00>] ? kthread_create_on_node+0x140/0x140
     [<ffffffff81645dd8>] ret_from_fork+0x58/0x90
     [<ffffffff810a5a00>] ? kthread_create_on_node+0x140/0x140
    RIP  [<ffffffffa050828a>] rbd_dev_refresh+0xfa/0x180 [rbd]

If an error occurs during rbd map, we have to error out, potentially
tearing down a watch.  Just like on rbd unmap, notifies have to be
flushed, otherwise rbd_watch_cb() may end up trying to read in the
image header after rbd_dev_image_release() has run:

    Assertion failure in rbd_dev_header_info() at line 4722:

     rbd_assert(rbd_image_format_valid(rbd_dev->image_format));

    Call Trace:
     [<ffffffff81cccee0>] ? rbd_parent_request_create+0x150/0x150
     [<ffffffff81cd4e59>] rbd_dev_refresh+0x59/0x390
     [<ffffffff81cd5229>] rbd_watch_cb+0x69/0x290
     [<ffffffff81fde9bf>] do_event_work+0x10f/0x1c0
     [<ffffffff81107799>] process_one_work+0x689/0x1a80
     [<ffffffff811076f7>] ? process_one_work+0x5e7/0x1a80
     [<ffffffff81132065>] ? finish_task_switch+0x225/0x640
     [<ffffffff81107110>] ? pwq_dec_nr_in_flight+0x2b0/0x2b0
     [<ffffffff81108c69>] worker_thread+0xd9/0x1320
     [<ffffffff81108b90>] ? process_one_work+0x1a80/0x1a80
     [<ffffffff8111b02d>] kthread+0x21d/0x2e0
     [<ffffffff8111ae10>] ? kthread_stop+0x550/0x550
     [<ffffffff82022802>] ret_from_fork+0x22/0x40
     [<ffffffff8111ae10>] ? kthread_stop+0x550/0x550
    RIP  [<ffffffff81ccd8f9>] rbd_dev_header_info+0xa19/0x1e30

To fix this, a) check if RBD_DEV_FLAG_EXISTS is set before calling
revalidate_disk(), b) move ceph_osdc_flush_notifies() call into
rbd_dev_header_unwatch_sync() to cover rbd map error paths and c) turn
header read-in into a critical section.  The latter also happens to
take care of rbd map foo@bar vs rbd snap rm foo@bar race.

Fixes: http://tracker.ceph.com/issues/15490

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Josh Durgin <jdurgin@redhat.com>
2016-04-28 10:07:22 +02:00
David Disseldorp 2224d879c7 rbd: use GFP_NOIO consistently for request allocations
As of 5a60e87603, RBD object request
allocations are made via rbd_obj_request_create() with GFP_NOIO.
However, subsequent OSD request allocations in rbd_osd_req_create*()
use GFP_ATOMIC.

With heavy page cache usage (e.g. OSDs running on same host as krbd
client), rbd_osd_req_create() order-1 GFP_ATOMIC allocations have been
observed to fail, where direct reclaim would have allowed GFP_NOIO
allocations to succeed.

Cc: stable@vger.kernel.org # 3.18+
Suggested-by: Vlastimil Babka <vbabka@suse.cz>
Suggested-by: Neil Brown <neilb@suse.com>
Signed-off-by: David Disseldorp <ddiss@suse.de>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-04-05 22:11:37 +02:00
Geliang Tang 03d9440676 rbd: use KMEM_CACHE macro
Use KMEM_CACHE() instead of kmem_cache_create() to simplify the code.

Signed-off-by: Geliang Tang <geliangtang@163.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-03-25 18:51:56 +01:00
Ilya Dryomov 3f1af42ad0 libceph: enable large, variable-sized OSD requests
Turn r_ops into a flexible array member to enable large, consisting of
up to 16 ops, OSD requests.  The use case is scattered writeback in
cephfs and, as far as the kernel client is concerned, 16 is just a made
up number.

r_ops had size 3 for copyup+hint+write, but copyup is really a special
case - it can only happen once.  ceph_osd_request_cache is therefore
stuffed with num_ops=2 requests, anything bigger than that is allocated
with kmalloc().  req_mempool is backed by ceph_osd_request_cache, which
means either num_ops=1 or num_ops=2 for use_mempool=true - all existing
users (ceph_writepages_start(), ceph_osdc_writepages()) are fine with
that.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-03-25 18:51:43 +01:00
Yan, Zheng 7665d85b73 libceph: move r_reply_op_{len,result} into struct ceph_osd_req_op
This avoids defining large array of r_reply_op_{len,result} in
in struct ceph_osd_request.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-03-25 18:51:42 +01:00
Markus Elfring 1761b22966 rbd: delete an unnecessary check before rbd_dev_destroy()
The rbd_dev_destroy() function tests whether its argument is NULL
and then returns immediately. Thus the test around the call is not needed.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-01-21 19:36:07 +01:00