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2011-02-25Merge branch 'for-linus' of git://neil.brown.name/mdLinus Torvalds1-1/+1
* 'for-linus' of git://neil.brown.name/md: md: Fix - again - partition detection when array becomes active Fix over-zealous flush_disk when changing device size. md: avoid spinlock problem in blk_throtl_exit md: correctly handle probe of an 'mdp' device. md: don't set_capacity before array is active. md: Fix raid1->raid0 takeover
2011-02-24Fix over-zealous flush_disk when changing device size.NeilBrown1-1/+1
There are two cases when we call flush_disk. In one, the device has disappeared (check_disk_change) so any data will hold becomes irrelevant. In the oter, the device has changed size (check_disk_size_change) so data we hold may be irrelevant. In both cases it makes sense to discard any 'clean' buffers, so they will be read back from the device if needed. In the former case it makes sense to discard 'dirty' buffers as there will never be anywhere safe to write the data. In the second case it *does*not* make sense to discard dirty buffers as that will lead to file system corruption when you simply enlarge the containing devices. flush_disk calls __invalidate_devices. __invalidate_device calls both invalidate_inodes and invalidate_bdev. invalidate_inodes *does* discard I_DIRTY inodes and this does lead to fs corruption. invalidate_bev *does*not* discard dirty pages, but I don't really care about that at present. So this patch adds a flag to __invalidate_device (calling it __invalidate_device2) to indicate whether dirty buffers should be killed, and this is passed to invalidate_inodes which can choose to skip dirty inodes. flusk_disk then passes true from check_disk_change and false from check_disk_size_change. dm avoids tripping over this problem by calling i_size_write directly rathher than using check_disk_size_change. md does use check_disk_size_change and so is affected. This regression was introduced by commit 608aeef17a which causes check_disk_size_change to call flush_disk, so it is suitable for any kernel since 2.6.27. Cc: stable@kernel.org Acked-by: Jeff Moyer <jmoyer@redhat.com> Cc: Andrew Patterson <andrew.patterson@hp.com> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: NeilBrown <neilb@suse.de>
2011-02-12nbd: remove module-level ioctl mutexSoren Hansen1-3/+0
Commit 2a48fc0ab242417 ("block: autoconvert trivial BKL users to private mutex") replaced uses of the BKL in the nbd driver with mutex operations. Since then, I've been been seeing these lock ups: INFO: task qemu-nbd:16115 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. qemu-nbd D 0000000000000001 0 16115 16114 0x00000004 ffff88007d775d98 0000000000000082 ffff88007d775fd8 ffff88007d774000 0000000000013a80 ffff8800020347e0 ffff88007d775fd8 0000000000013a80 ffff880133730000 ffff880002034440 ffffea0004333db8 ffffffffa071c020 Call Trace: [<ffffffff815b9997>] __mutex_lock_slowpath+0xf7/0x180 [<ffffffff815b93eb>] mutex_lock+0x2b/0x50 [<ffffffffa071a21c>] nbd_ioctl+0x6c/0x1c0 [nbd] [<ffffffff812cb970>] blkdev_ioctl+0x230/0x730 [<ffffffff811967a1>] block_ioctl+0x41/0x50 [<ffffffff81175c03>] do_vfs_ioctl+0x93/0x370 [<ffffffff81175f61>] sys_ioctl+0x81/0xa0 [<ffffffff8100c0c2>] system_call_fastpath+0x16/0x1b Instrumenting the nbd module's ioctl handler with some extra logging clearly shows the NBD_DO_IT ioctl being invoked which is a long-lived ioctl in the sense that it doesn't return until another ioctl asks the driver to disconnect. However, that other ioctl blocks, waiting for the module-level mutex that replaced the BKL, and then we're stuck. This patch removes the module-level mutex altogether. It's clearly wrong, and as far as I can see, it's entirely unnecessary, since the nbd driver maintains per-device mutexes, and I don't see anything that would require a module-level (or kernel-level, for that matter) mutex. Signed-off-by: Soren Hansen <soren@linux2go.dk> Acked-by: Serge Hallyn <serge.hallyn@canonical.com> Acked-by: Paul Clements <paul.clements@steeleye.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Jens Axboe <axboe@kernel.dk> Cc: <stable@kernel.org> [2.6.37.x] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-01-19cciss: make cciss_revalidate not loop through CISS_MAX_LUNS volumes ↵Stephen M. Cameron1-1/+1
unnecessarily. Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2011-01-19drivers/block/aoe/Makefile: replace the use of <module>-objs with <module>-yTracey Dent1-1/+1
Change Makefile to use <modules>-y instead of <modules>-objs because -objs is deprecated and should now be switched. According to (documentation/kbuild/makefiles.txt). Signed-off-by: Tracey Dent <tdent48227@gmail.com> Cc: "Ed L. Cashin" <ecashin@coraid.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2011-01-19loop: queue_lock NULL pointer derefence in blk_throtl_exitSergey Senozhatsky1-0/+3
Performing $ sudo mount -o loop -o umask=0 /dev/sdb1 /mnt/ mount: wrong fs type, bad option, bad superblock on /dev/loop0, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so $ sudo modprobe -r loop results in oops: BUG: unable to handle kernel NULL pointer dereference at 0000000000000004 IP: [<ffffffff812479d4>] do_raw_spin_lock+0x14/0x122 Process modprobe (pid: 6189, threadinfo ffff88009a898000, task ffff880154a88000) Call Trace: [<ffffffff81486788>] _raw_spin_lock_irq+0x4a/0x51 [<ffffffff8123404b>] ? blk_throtl_exit+0x3b/0xa0 [<ffffffff8105b120>] ? cancel_delayed_work_sync+0xd/0xf [<ffffffff8123404b>] blk_throtl_exit+0x3b/0xa0 [<ffffffff81229bc8>] blk_release_queue+0x21/0x65 [<ffffffff8123bb06>] kobject_release+0x51/0x66 [<ffffffff8123bab5>] ? kobject_release+0x0/0x66 [<ffffffff8123ce1e>] kref_put+0x43/0x4d [<ffffffff8123ba27>] kobject_put+0x47/0x4b [<ffffffff8122717c>] blk_cleanup_queue+0x56/0x5b [<ffffffffa01c3824>] loop_exit+0x68/0x844 [loop] [<ffffffff8107cccc>] sys_delete_module+0x1e8/0x25b [<ffffffff814864c9>] ? trace_hardirqs_on_thunk+0x3a/0x3f [<ffffffff81002112>] system_call_fastpath+0x16/0x1b because of an attempt to acquire NULL queue_lock. I added the same lines as in blk_queue_make_request - index 44e18c0..49e6a54 100644`fall back to embedded per-queue lock'. Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2011-01-19drivers/block/Makefile: replace the use of <module>-objs with <module>-yTracey Dent1-1/+1
Change Makefile to use <modules>-y instead of <modules>-objs because -objs is deprecated and should now be switched. According to (documentation/kbuild/makefiles.txt). Signed-off-by: Tracey Dent <tdent48227@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2011-01-13Merge branch 'for-2.6.38/drivers' of git://git.kernel.dk/linux-2.6-blockLinus Torvalds4-20/+24
* 'for-2.6.38/drivers' of git://git.kernel.dk/linux-2.6-block: cciss: reinstate proper FIFO order of command queue list floppy: replace NO_GEOM macro with a function
2011-01-13Merge branch 'for-2.6.38/core' of git://git.kernel.dk/linux-2.6-blockLinus Torvalds5-93/+47
* 'for-2.6.38/core' of git://git.kernel.dk/linux-2.6-block: (43 commits) block: ensure that completion error gets properly traced blktrace: add missing probe argument to block_bio_complete block cfq: don't use atomic_t for cfq_group block cfq: don't use atomic_t for cfq_queue block: trace event block fix unassigned field block: add internal hd part table references block: fix accounting bug on cross partition merges kref: add kref_test_and_get bio-integrity: mark kintegrityd_wq highpri and CPU intensive block: make kblockd_workqueue smarter Revert "sd: implement sd_check_events()" block: Clean up exit_io_context() source code. Fix compile warnings due to missing removal of a 'ret' variable fs/block: type signature of major_to_index(int) to major_to_index(unsigned) block: convert !IS_ERR(p) && p to !IS_ERR_NOR_NULL(p) cfq-iosched: don't check cfqg in choose_service_tree() fs/splice: Pull buf->ops->confirm() from splice_from_pipe actors cdrom: export cdrom_check_events() sd: implement sd_check_events() sr: implement sr_check_events() ...
2011-01-13Merge branch 'for-linus' of ↵Linus Torvalds1-4/+15
git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client: rbd: fix cleanup when trying to mount inexistent image net/ceph: make ceph_msgr_wq non-reentrant ceph: fsc->*_wq's aren't used in memory reclaim path ceph: Always free allocated memory in osdmap_decode() ceph: Makefile: Remove unnessary code ceph: associate requests with opening sessions ceph: drop redundant r_mds field ceph: implement DIRLAYOUTHASH feature to get dir layout from MDS ceph: add dir_layout to inode
2011-01-13rbd: fix cleanup when trying to mount inexistent imageYehuda Sadeh1-4/+15
Previously we didn't clean up the sysfs entry that was just created. Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net> Signed-off-by: Sage Weil <sage@newdream.net>
2011-01-12Merge branch 'stable/xenbus' of ↵Linus Torvalds1-0/+1
git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen * 'stable/xenbus' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen: xen/xenbus: making backend support modular is too complex xen/pci: Make xen-pcifront be dependent on XEN_XENBUS_FRONTEND xen/xenbus: fixup checkpatch issues in xenbus_probe* xen/netfront: select XEN_XENBUS_FRONTEND xen/xenbus: clean up noise in xenbus_probe_frontend.c xen/xenbus: clean up noise in xenbus_probe_backend.c xen/xenbus: clean up noise in xenbus_probe.c xen/xenbus: cleanup debug noise in xenbus_comms.c xen/xenbus: clean up error handling xen/xenbus: make frontend bus GPL xen/xenbus: make sure backend bus is registered earlier xenbus/frontend: register bus earlier xen: remove xen/evtchn.h xen: add backend driver support xen: separate out frontend xenbus
2011-01-10cciss: reinstate proper FIFO order of command queue listJens Axboe3-15/+14
Commit 8a3173de inadvertently changed the ordering when switching to hlists. Change to regular list heads so we can use tail list adds, this improves performance. Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2011-01-08Merge branch 'for-2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wqLinus Torvalds2-4/+4
* 'for-2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq: (33 commits) usb: don't use flush_scheduled_work() speedtch: don't abuse struct delayed_work media/video: don't use flush_scheduled_work() media/video: explicitly flush request_module work ioc4: use static work_struct for ioc4_load_modules() init: don't call flush_scheduled_work() from do_initcalls() s390: don't use flush_scheduled_work() rtc: don't use flush_scheduled_work() mmc: update workqueue usages mfd: update workqueue usages dvb: don't use flush_scheduled_work() leds-wm8350: don't use flush_scheduled_work() mISDN: don't use flush_scheduled_work() macintosh/ams: don't use flush_scheduled_work() vmwgfx: don't use flush_scheduled_work() tpm: don't use flush_scheduled_work() sonypi: don't use flush_scheduled_work() hvsi: don't use flush_scheduled_work() xen: don't use flush_scheduled_work() gdrom: don't use flush_scheduled_work() ... Fixed up trivial conflict in drivers/media/video/bt8xx/bttv-input.c as per Tejun.
2011-01-06xen: separate out frontend xenbusIan Campbell1-0/+1
Impact: refactor Make a distinct frontend xenbus, in preparation for adding a backend xenbus. Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> [corresponds to 2fd433a4188f in git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen.git with adjustments to reflect changes in the code which is moved] Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2010-12-27Merge branch 'master' of ↵David S. Miller9-317/+534
master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 Conflicts: net/ipv4/fib_frontend.c
2010-12-24xen: don't use flush_scheduled_work()Tejun Heo1-2/+2
flush_scheduled_work() is deprecated and scheduled to be removed. Directly flush info->work instead. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2010-12-24floppy: don't use flush_scheduled_work()Tejun Heo1-2/+2
flush_scheduled_work() is deprecated and scheduled to be removed. Directly flush floppy_work instead. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Jens Axboe <axboe@kernel.dk>
2010-12-21Fix build error in drivers/block/cciss.cLinus Torvalds1-1/+1
.. caused by a missing semi-colon, introduced in commit 0fc13c8995cd ("cciss: fix cciss_revalidate panic"). Reported-by: Stephen Rothwell <sfr@canb.auug.org.au> Reported-by: Thiago Farina <tfransosi@gmail.com> Cc: Jens Axboe <jaxboe@fusionio.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-12-20Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-blockLinus Torvalds4-8/+21
* 'for-linus' of git://git.kernel.dk/linux-2.6-block: cciss: fix cciss_revalidate panic block: max hardware sectors limit wrapper block: Deprecate QUEUE_FLAG_CLUSTER and use queue_limits instead blk-throttle: Correct the placement of smp_rmb() blk-throttle: Trim/adjust slice_end once a bio has been dispatched block: check for proper length of iov entries earlier in blk_rq_map_user_iov() drbd: fix for spin_lock_irqsave in endio callback drbd: don't recvmsg with zero length
2010-12-20Fix compile warnings due to missing removal of a 'ret' variableJens Axboe1-1/+1
Commit a8adbe3 forgot to remove the return variable, kill it. drivers/block/loop.c: In function 'lo_splice_actor': drivers/block/loop.c:398: warning: unused variable 'ret' [...] fs/nfsd/vfs.c: In function 'nfsd_splice_actor': fs/nfsd/vfs.c:848: warning: unused variable 'ret' Reported-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2010-12-17cciss: fix cciss_revalidate panicStephen M. Cameron1-0/+2
If you delete a logical drive, and then run BLKRRPART (e.g. via fdisk) on a logical drive which is "after" the deleted logical drive in the h->drv[] array, then cciss_revalidate panics because it will access the null pointer h->drv[x] when x hits the deleted drive. Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com> Cc: stable@kernel.org Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2010-12-17fs/splice: Pull buf->ops->confirm() from splice_from_pipe actorsMichał Mirosław1-4/+0
This patch pulls calls to buf->ops->confirm() from all actors passed (also indirectly) to splice_from_pipe_feed(). Is avoiding the call to buf->ops->confirm() while splice()ing to /dev/null is an intentional optimization? No other user does that and this will remove this special case. Against current linux.git 6313e3c21743cc88bb5bd8aa72948ee1e83937b6. Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2010-12-15xen: Provide a variant of __RING_SIZE() that is an integer constant expressionJeremy Fitzhardinge1-1/+1
Without this, gcc 4.5 won't compile xen-netfront and xen-blkfront, where this is being used to specify array sizes. Signed-off-by: Jan Beulich <jbeulich@novell.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: David Miller <davem@davemloft.net> Cc: Stable Kernel <stable@kernel.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-12-02Merge branch 'rbd-sysfs' of ↵Linus Torvalds1-277/+471
git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client * 'rbd-sysfs' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client: rbd: replace the rbd sysfs interface
2010-12-02rbd: replace the rbd sysfs interfaceYehuda Sadeh1-277/+471
The new interface creates directories per mapped image and under each it creates a subdir per available snapshot. This allows keeping a cleaner interface within the sysfs guidelines. The ABI documentation was updated too. Acked-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net> Signed-off-by: Sage Weil <sage@newdream.net>
2010-11-27drbd: fix for spin_lock_irqsave in endio callbackLars Ellenberg2-2/+11
In commit 9b7f76dc37919ea36caa9680a3f765e5b19b25fb, Author: Lars Ellenberg <lars.ellenberg@linbit.com> Date: Wed Aug 11 23:40:24 2010 +0200 drbd: new configuration parameter c-min-rate a bad chunk slipped through, which is now reverted as well, restoring the correct irqsave for the endio callback. This patch also add comments at both req_mod() and in the endio callback so it should not happen again. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2010-11-27drbd: don't recvmsg with zero lengthLars Ellenberg1-6/+8
This should fix a performance degradation we observed recently. If we don't expect any subheader, we should not call into the tcp stack, as that may add considerable latency if there is no data available at this point. For a synthetic synchronous write load with single outstanding writes, this additional latency when processing the "unplug remote" packet added up to a performance degradation factor >= 10. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2010-11-27Merge branch 'cleanup-bd_claim' of ↵Jens Axboe4-88/+46
git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc into for-2.6.38/core
2010-11-27Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-blockLinus Torvalds4-26/+36
* 'for-linus' of git://git.kernel.dk/linux-2.6-block: cciss: fix build for PROC_FS disabled block: fix amiga and atari floppy driver compile warning blk-throttle: Fix calculation of max number of WRITES to be dispatched ioprio: grab rcu_read_lock in sys_ioprio_{set,get}() xen/blkfront: cope with backend that fail empty BLKIF_OP_WRITE_BARRIER requests xen/blkfront: Implement FUA with BLKIF_OP_WRITE_BARRIER xen/blkfront: change blk_shadow.request to proper pointer xen/blkfront: map REQ_FLUSH into a full barrier
2010-11-17BKL: remove extraneous #include <smp_lock.h>Arnd Bergmann2-2/+0
The big kernel lock has been removed from all these files at some point, leaving only the #include. Remove this too as a cleanup. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-11-17cciss: fix build for PROC_FS disabledJens Axboe1-2/+1
The recent patch to fix the removal of a non-existing proc directory introduced this build problem for !CONFIG_PROC_FS: drivers/block/cciss.c:4929: error: 'proc_cciss' undeclared (first use in this function) Fix it by moving proc_cciss outside of the CONFIG_PROC_FS scope. Reported-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2010-11-17SCSI host lock push-downJeff Garzik1-3/+5
Move the mid-layer's ->queuecommand() invocation from being locked with the host lock to being unlocked to facilitate speeding up the critical path for drivers who don't need this lock taken anyway. The patch below presents a simple SCSI host lock push-down as an equivalent transformation. No locking or other behavior should change with this patch. All existing bugs and locking orders are preserved. Additionally, add one parameter to queuecommand, struct Scsi_Host * and remove one parameter from queuecommand, void (*done)(struct scsi_cmnd *) Scsi_Host* is a convenient pointer that most host drivers need anyway, and 'done' is redundant to struct scsi_cmnd->scsi_done. Minimal code disturbance was attempted with this change. Most drivers needed only two one-line modifications for their host lock push-down. Signed-off-by: Jeff Garzik <jgarzik@redhat.com> Acked-by: James Bottomley <James.Bottomley@suse.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-11-15block: fix amiga and atari floppy driver compile warningVivek Goyal2-2/+2
Geert, my crosstool don't produce warning below. I guess this has to do something with compiler version. - Geert noticed following warning during compilation. drivers/block/amiflop.c:1344: warning: ‘rq’ may be used uninitialized in this function drivers/block/ataflop.c:1402: warning: ‘rq’ may be used uninitialized in this function - Initialize rq to NULL to fix the warning. If we can't find a suitable request to dispatch, this function should return NULL instead of a possibly garbage pointer. - Cross compile tested only. Don't have hardware to test it. Reported-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2010-11-14Merge branch 'master' of ↵David S. Miller13-425/+267
master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
2010-11-13block: clean up blkdev_get() wrappers and their usersTejun Heo1-6/+6
After recent blkdev_get() modifications, open_by_devnum() and open_bdev_exclusive() are simple wrappers around blkdev_get(). Replace them with blkdev_get_by_dev() and blkdev_get_by_path(). blkdev_get_by_dev() is identical to open_by_devnum(). blkdev_get_by_path() is slightly different in that it doesn't automatically add %FMODE_EXCL to @mode. All users are converted. Most conversions are mechanical and don't introduce any behavior difference. There are several exceptions. * btrfs now sets FMODE_EXCL in btrfs_device->mode, so there's no reason to OR it explicitly on blkdev_put(). * gfs2, nilfs2 and the generic mount_bdev() now set FMODE_EXCL in sb->s_mode. * With the above changes, sb->s_mode now always should contain FMODE_EXCL. WARN_ON_ONCE() added to kill_block_super() to detect errors. The new blkdev_get_*() functions are with proper docbook comments. While at it, add function description to blkdev_get() too. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Philipp Reisner <philipp.reisner@linbit.com> Cc: Neil Brown <neilb@suse.de> Cc: Mike Snitzer <snitzer@redhat.com> Cc: Joern Engel <joern@lazybastard.org> Cc: Chris Mason <chris.mason@oracle.com> Cc: Jan Kara <jack@suse.cz> Cc: "Theodore Ts'o" <tytso@mit.edu> Cc: KONISHI Ryusuke <konishi.ryusuke@lab.ntt.co.jp> Cc: reiserfs-devel@vger.kernel.org Cc: xfs-masters@oss.sgi.com Cc: Alexander Viro <viro@zeniv.linux.org.uk>
2010-11-13block: make blkdev_get/put() handle exclusive accessTejun Heo4-88/+46
Over time, block layer has accumulated a set of APIs dealing with bdev open, close, claim and release. * blkdev_get/put() are the primary open and close functions. * bd_claim/release() deal with exclusive open. * open/close_bdev_exclusive() are combination of open and claim and the other way around, respectively. * bd_link/unlink_disk_holder() to create and remove holder/slave symlinks. * open_by_devnum() wraps bdget() + blkdev_get(). The interface is a bit confusing and the decoupling of open and claim makes it impossible to properly guarantee exclusive access as in-kernel open + claim sequence can disturb the existing exclusive open even before the block layer knows the current open if for another exclusive access. Reorganize the interface such that, * blkdev_get() is extended to include exclusive access management. @holder argument is added and, if is @FMODE_EXCL specified, it will gain exclusive access atomically w.r.t. other exclusive accesses. * blkdev_put() is similarly extended. It now takes @mode argument and if @FMODE_EXCL is set, it releases an exclusive access. Also, when the last exclusive claim is released, the holder/slave symlinks are removed automatically. * bd_claim/release() and close_bdev_exclusive() are no longer necessary and either made static or removed. * bd_link_disk_holder() remains the same but bd_unlink_disk_holder() is no longer necessary and removed. * open_bdev_exclusive() becomes a simple wrapper around lookup_bdev() and blkdev_get(). It also has an unexpected extra bdev_read_only() test which probably should be moved into blkdev_get(). * open_by_devnum() is modified to take @holder argument and pass it to blkdev_get(). Most of bdev open/close operations are unified into blkdev_get/put() and most exclusive accesses are tested atomically at the open time (as it should). This cleans up code and removes some, both valid and invalid, but unnecessary all the same, corner cases. open_bdev_exclusive() and open_by_devnum() can use further cleanup - rename to blkdev_get_by_path() and blkdev_get_by_devt() and drop special features. Well, let's leave them for another day. Most conversions are straight-forward. drbd conversion is a bit more involved as there was some reordering, but the logic should stay the same. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Neil Brown <neilb@suse.de> Acked-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Acked-by: Mike Snitzer <snitzer@redhat.com> Acked-by: Philipp Reisner <philipp.reisner@linbit.com> Cc: Peter Osterlund <petero2@telia.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Jan Kara <jack@suse.cz> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Andreas Dilger <adilger.kernel@dilger.ca> Cc: "Theodore Ts'o" <tytso@mit.edu> Cc: Mark Fasheh <mfasheh@suse.com> Cc: Joel Becker <joel.becker@oracle.com> Cc: Alex Elder <aelder@sgi.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: dm-devel@redhat.com Cc: drbd-dev@lists.linbit.com Cc: Leo Chen <leochen@broadcom.com> Cc: Scott Branden <sbranden@broadcom.com> Cc: Chris Mason <chris.mason@oracle.com> Cc: Steven Whitehouse <swhiteho@redhat.com> Cc: Dave Kleikamp <shaggy@linux.vnet.ibm.com> Cc: Joern Engel <joern@logfs.org> Cc: reiserfs-devel@vger.kernel.org Cc: Alexander Viro <viro@zeniv.linux.org.uk>
2010-11-12Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-blockLinus Torvalds13-425/+267
* 'for-linus' of git://git.kernel.dk/linux-2.6-block: (27 commits) block: remove unused copy_io_context() Documentation: remove anticipatory scheduler info block: remove REQ_HARDBARRIER ioprio: rcu_read_lock/unlock protect find_task_by_vpid call (V2) ioprio: fix RCU locking around task dereference block: ioctl: fix information leak to userland block: read i_size with i_size_read() cciss: fix proc warning on attempt to remove non-existant directory bio: take care not overflow page count when mapping/copying user data block: limit vec count in bio_kmalloc() and bio_alloc_map_data() block: take care not to overflow when calculating total iov length block: check for proper length of iov entries in blk_rq_map_user_iov() cciss: remove controllers supported by hpsa cciss: use usleep_range not msleep for small sleeps cciss: limit commands allocated on reset_devices cciss: Use kernel provided PCI state save and restore functions cciss: fix board status waiting code drbd: Removed checks for REQ_HARDBARRIER on incomming BIOs drbd: REQ_HARDBARRIER -> REQ_FUA transition for meta data accesses drbd: Removed the BIO_RW_BARRIER support form the receiver/epoch code ...
2010-11-12Merge branch 'upstream/blkfront' of ↵Jens Axboe1-22/+33
git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen into for-linus Conflicts: drivers/block/xen-blkfront.c Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2010-11-10block: remove REQ_HARDBARRIERChristoph Hellwig3-11/+0
REQ_HARDBARRIER is dead now, so remove the leftovers. What's left at this point is: - various checks inside the block layer. - sanity checks in bio based drivers. - now unused bio_empty_barrier helper. - Xen blockfront use of BLKIF_OP_WRITE_BARRIER - it's dead for a while, but Xen really needs to sort out it's barrier situaton. - setting of ordered tags in uas - dead code copied from old scsi drivers. - scsi different retry for barriers - it's dead and should have been removed when flushes were converted to FS requests. - blktrace handling of barriers - removed. Someone who knows blktrace better should add support for REQ_FLUSH and REQ_FUA, though. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2010-11-10Merge branch 'for-2.6.37/drivers' into for-linusJens Axboe10-412/+264
Conflicts: drivers/block/cciss.c Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2010-11-10block: read i_size with i_size_read()Mike Snitzer1-1/+1
Convert direct reads of an inode's i_size to using i_size_read(). i_size_{read,write} use a seqcount to protect reads from accessing incomple writes. Concurrent i_size_write()s require mutual exclussion to protect the seqcount that is used by i_size_{read,write}. But i_size_read() callers do not need to use additional locking. Signed-off-by: Mike Snitzer <snitzer@redhat.com> Acked-by: NeilBrown <neilb@suse.de> Acked-by: Lars Ellenberg <lars.ellenberg@linbit.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2010-11-10cciss: fix proc warning on attempt to remove non-existant directoryJens Axboe1-1/+2
Randy reports that he gets the following stack trace when removing the cciss module: [ 109.164277] Pid: 3463, comm: rmmod Not tainted 2.6.37-rc1 #7 [ 109.164280] Call Trace: [ 109.164292] [<ffffffff8107eb8d>] warn_slowpath_common+0xc6/0xf3 [ 109.164299] [<ffffffff8107ecaa>] warn_slowpath_fmt+0x5b/0x6b [ 109.164307] [<ffffffff8155175b>] ? _raw_spin_unlock+0x40/0x4b [ 109.164313] [<ffffffff8123dd1e>] remove_proc_entry+0x156/0x35e [ 109.164320] [<ffffffff812cd91b>] ? do_raw_spin_unlock+0xff/0x10f [ 109.164327] [<ffffffff8113823d>] ? trace_hardirqs_on+0x10/0x4a [ 109.164333] [<ffffffff8155162d>] ? _raw_spin_unlock_irq+0x4c/0x7b [ 109.164339] [<ffffffff8154d4d1>] ? wait_for_common+0x145/0x15e [ 109.164345] [<ffffffff81075337>] ? default_wake_function+0x0/0x22 [ 109.164357] [<ffffffffa0615a8f>] cciss_cleanup+0xa9/0xc7 [cciss] [ 109.164365] [<ffffffff810d3cb0>] sys_delete_module+0x2d6/0x368 [ 109.164371] [<ffffffff8155036b>] ? lockdep_sys_exit_thunk+0x35/0x67 [ 109.164377] [<ffffffff810fdfaf>] ? audit_syscall_entry+0x172/0x1a5 [ 109.164383] [<ffffffff815502f5>] ? trace_hardirqs_on_thunk+0x3a/0x3f [ 109.164389] [<ffffffff8100ea72>] system_call_fastpath+0x16/0x1b [ 109.164394] ---[ end trace 88e8568246ed0b1d ]--- which will happen if you don't actually have an HP CISS adapter, since it'll do an uncondional removal of a proc directory it never attempted to create in that case. Reported-by: Randy Dunlap <randy.dunlap@oracle.com> Tested-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2010-11-09aoe: remove dev_base_lock use from aoecmd_cfg_pkts()Eric Dumazet1-3/+3
dev_base_lock is the legacy way to lock the device list, and is planned to disappear. (writers hold RTNL, readers hold RCU lock) Convert aoecmd_cfg_pkts() to RCU locking. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Cc: "Ed L. Cashin" <ecashin@coraid.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-11-08floppy: replace NO_GEOM macro with a functionPekka Enberg1-5/+10
This patch replaces the NO_GEOM macro with a proper static inline function and converts an open-coded caller in check_floppy_change() to use it. Cc: Stephen Hemminger <shemminger@vyatta.com> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Pekka Enberg <penberg@kernel.org> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2010-11-06floppy: fix another use-after-freeVivek Goyal1-1/+1
While scanning the floopy code due to c093ee4f07f4 ("floppy: fix use-after-free in module load failure path"), I found one more instance of trying to access disk->queue pointer after doing put_disk() on gendisk. For some reason , floppy moule still loads/unloads fine. The object is probably still around with right pointer values. o There seems to be one more instance of trying to cleanup the request queue after we have called put_disk() on associated gendisk. o This fix is more out of code inspection. Even without this fix for some reason I am able to load/unload floppy module without any issues. o Floppy module loads/unloads fine after the fix. Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-11-06floppy: fix use-after-free in module load failure pathLinus Torvalds1-1/+1
Commit 488211844e0c ("floppy: switch to one queue per drive instead of sharing a queue") introduced a use-after-free. We do "put_disk()" on the disk device _before_ we then clean up the queue associated with that disk. Move the put_disk() down to avoid dereferencing a free'd data structure. Cc: Jens Axboe <jaxboe@fusionio.com> Cc: Vivek Goyal <vgoyal@redhat.com> Reported-and-tested-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-11-02xen/blkfront: cope with backend that fail empty BLKIF_OP_WRITE_BARRIER requestsJeremy Fitzhardinge1-0/+10
Some(?) Xen block backends fail BLKIF_OP_WRITE_BARRIER requests, which Linux uses as a cache flush operation. In that case, disable use of FLUSH. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: Daniel Stodden <daniel.stodden@citrix.com>
2010-11-02xen/blkfront: Implement FUA with BLKIF_OP_WRITE_BARRIERJeremy Fitzhardinge1-2/+12
The BLKIF_OP_WRITE_BARRIER is a full ordered barrier, so we can use it to implement FUA as well as a plain FLUSH. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Acked-by: Christoph Hellwig <hch@lst.de>
2010-11-02xen/blkfront: change blk_shadow.request to proper pointerJeremy Fitzhardinge1-8/+6
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
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