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* pipe: set lower and upper limit on max pages in the pipe page arrayJens Axboe2010-05-211-0/+2
| | | | | | | | | | | We need at least two to guarantee proper POSIX behaviour, so never allow a smaller limit than that. Also expose a /proc/sys/fs/pipe-max-pages sysctl file that allows root to define a sane upper limit. Make it default to 16 times the default size, which is 16 pages. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* pipe: add support for shrinking and growing pipesJens Axboe2010-05-213-4/+20
| | | | | | | | | This patch adds F_GETPIPE_SZ and F_SETPIPE_SZ fcntl() actions for growing and shrinking the size of a pipe and adjusts pipe.c and splice.c (and relay and network splice) usage to work with these larger (or smaller) pipes. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* drbd: This is now equivalent to drbd release 8.3.8rc1Philipp Reisner2010-05-211-2/+2
| | | | | | Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* writeback: fix problem with !CONFIG_BLOCK compilationJens Axboe2010-05-211-0/+4
| | | | | | | | | | | | | | | | When CONFIG_BLOCK isn't enabled: mm/page-writeback.c: In function 'laptop_mode_timer_fn': mm/page-writeback.c:708: error: dereferencing pointer to incomplete type mm/page-writeback.c:709: error: dereferencing pointer to incomplete type Fix this by essentially eliminating the laptop sync handlers when CONFIG_BLOCK isn't set, as most are only used from the block layer code. The exception is laptop_sync_completion() which is used from sys_sync(), make that an empty declaration in that case. Reported-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* block,ide: simplify bdops->set_capacity() to ->unlock_native_capacity()Tejun Heo2010-05-212-3/+2
| | | | | | | | | | | | | | | | | | | | bdops->set_capacity() is unnecessarily generic. All that's required is a simple one way notification to lower level driver telling it to try to unlock native capacity. There's no reason to pass in target capacity or return the new capacity. The former is always the inherent native capacity and the latter can be handled via the usual device resize / revalidation path. In fact, the current API is always used that way. Replace ->set_capacity() with ->unlock_native_capacity() which take only @disk and doesn't return anything. IDE which is the only current user of the API is converted accordingly. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Ben Hutchings <ben@decadent.org.uk> Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* writeback: fixups for !dirty_writeback_centisecsJens Axboe2010-05-211-0/+1
| | | | | | | | | | | | | | Commit 69b62d01 fixed up most of the places where we would enter busy schedule() spins when disabling the periodic background writeback. This fixes up the sb timer so that it doesn't get hammered on with the delay disabled, and ensures that it gets rearmed if needed when /proc/sys/vm/dirty_writeback_centisecs gets modified. bdi_forker_task() also needs to check for !dirty_writeback_centisecs and use schedule() appropriately, fix that up too. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* drbd: Four new configuration settings for resync speed controlPhilipp Reisner2010-05-182-0/+20
| | | | | | | | | To reasonably control resync speed over drbd-proxy connections, drbd has to measure the current delay of packets transmitted over the (possibly congested) data socket vs the meta-data socket. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
* drbd: Implemented the --assume-clean option for drbdsetup resizePhilipp Reisner2010-05-182-1/+3
| | | | | Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
* writeback: fix WB_SYNC_NONE writeback from umountJens Axboe2010-05-172-1/+11
| | | | | | | | | | | | | When umount calls sync_filesystem(), we first do a WB_SYNC_NONE writeback to kick off writeback of pending dirty inodes, then follow that up with a WB_SYNC_ALL to wait for it. Since umount already holds the sb s_umount mutex, WB_SYNC_NONE ends up doing nothing and all writeback happens as WB_SYNC_ALL. This can greatly slow down umount, since WB_SYNC_ALL writeback is a data integrity operation and thus a bigger hammer than simple WB_SYNC_NONE. For barrier aware file systems it's a lot slower. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* block: allow initialization of previously allocated request_queueMike Snitzer2010-05-111-0/+5
| | | | | | | | | | | | | | | | | | | | blk_init_queue() allocates the request_queue structure and then initializes it as needed (request_fn, elevator, etc). Split initialization out to blk_init_allocated_queue_node. Introduce blk_init_allocated_queue wrapper function to model existing blk_init_queue and blk_init_queue_node interfaces. Export elv_register_queue to allow a newly added elevator to be registered with sysfs. Export elv_unregister_queue for symmetry. These changes allow DM to initialize a device's request_queue with more precision. In particular, DM no longer unconditionally initializes a full request_queue (elevator et al). It only does so for a request-based DM device. Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* Merge branch 'master' into for-2.6.35Jens Axboe2010-04-2919-48/+188
|\ | | | | | | | | | | | | Conflicts: fs/block_dev.c Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
| * Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6Linus Torvalds2010-04-282-0/+2
| |\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: (27 commits) sfc: Change falcon_probe_board() to fail for unsupported boards sfc: Always close net device at the end of a disabling reset sfc: Wait at most 10ms for the MC to finish reading out MAC statistics sctp: Fix oops when sending queued ASCONF chunks sctp: fix to calc the INIT/INIT-ACK chunk length correctly is set sctp: per_cpu variables should be in bh_disabled section sctp: fix potential reference of a freed pointer sctp: avoid irq lock inversion while call sk->sk_data_ready() Revert "tcp: bind() fix when many ports are bound" net/usb: add sierra_net.c driver cdc_ether: fix autosuspend for mbm devices bluetooth: handle l2cap_create_connless_pdu() errors gianfar: Wait for both RX and TX to stop ipheth: potential null dereferences on error path smc91c92_cs: spin_unlock_irqrestore before calling smc_interrupt() drivers/usb/net/kaweth.c: add device "Allied Telesyn AT-USB10 USB Ethernet Adapter" bnx2: Update version to 2.0.9. bnx2: Prevent "scheduling while atomic" warning with cnic, bonding and vlan. bnx2: Fix lost MSI-X problem on 5709 NICs. cxgb3: Wait longer for control packets on initialization ...
| | * sctp: Fix oops when sending queued ASCONF chunksVlad Yasevich2010-04-281-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When we finish processing ASCONF_ACK chunk, we try to send the next queued ASCONF. This action runs the sctp state machine recursively and it's not prepared to do so. kernel BUG at kernel/timer.c:790! invalid opcode: 0000 [#1] SMP last sysfs file: /sys/module/ipv6/initstate Modules linked in: sha256_generic sctp libcrc32c ipv6 dm_multipath uinput 8139too i2c_piix4 8139cp mii i2c_core pcspkr virtio_net joydev floppy virtio_blk virtio_pci [last unloaded: scsi_wait_scan] Pid: 0, comm: swapper Not tainted 2.6.34-rc4 #15 /Bochs EIP: 0060:[<c044a2ef>] EFLAGS: 00010286 CPU: 0 EIP is at add_timer+0xd/0x1b EAX: cecbab14 EBX: 000000f0 ECX: c0957b1c EDX: 03595cf4 ESI: cecba800 EDI: cf276f00 EBP: c0957aa0 ESP: c0957aa0 DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 Process swapper (pid: 0, ti=c0956000 task=c0988ba0 task.ti=c0956000) Stack: c0957ae0 d1851214 c0ab62e4 c0ab5f26 0500ffff 00000004 00000005 00000004 <0> 00000000 d18694fd 00000004 1666b892 cecba800 cecba800 c0957b14 00000004 <0> c0957b94 d1851b11 ceda8b00 cecba800 cf276f00 00000001 c0957b14 000000d0 Call Trace: [<d1851214>] ? sctp_side_effects+0x607/0xdfc [sctp] [<d1851b11>] ? sctp_do_sm+0x108/0x159 [sctp] [<d1863386>] ? sctp_pname+0x0/0x1d [sctp] [<d1861a56>] ? sctp_primitive_ASCONF+0x36/0x3b [sctp] [<d185657c>] ? sctp_process_asconf_ack+0x2a4/0x2d3 [sctp] [<d184e35c>] ? sctp_sf_do_asconf_ack+0x1dd/0x2b4 [sctp] [<d1851ac1>] ? sctp_do_sm+0xb8/0x159 [sctp] [<d1863334>] ? sctp_cname+0x0/0x52 [sctp] [<d1854377>] ? sctp_assoc_bh_rcv+0xac/0xe1 [sctp] [<d1858f0f>] ? sctp_inq_push+0x2d/0x30 [sctp] [<d186329d>] ? sctp_rcv+0x797/0x82e [sctp] Tested-by: Wei Yongjun <yjwei@cn.fujitsu.com> Signed-off-by: Yuansong Qiao <ysqiao@research.ait.ie> Signed-off-by: Shuaijun Zhang <szhang@research.ait.ie> Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| | * sctp: avoid irq lock inversion while call sk->sk_data_ready()Wei Yongjun2010-04-281-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | sk->sk_data_ready() of sctp socket can be called from both BH and non-BH contexts, but the default sk->sk_data_ready(), sock_def_readable(), can not be used in this case. Therefore, we have to make a new function sctp_data_ready() to grab sk->sk_data_ready() with BH disabling. ========================================================= [ INFO: possible irq lock inversion dependency detected ] 2.6.33-rc6 #129 --------------------------------------------------------- sctp_darn/1517 just changed the state of lock: (clock-AF_INET){++.?..}, at: [<c06aab60>] sock_def_readable+0x20/0x80 but this lock took another, SOFTIRQ-unsafe lock in the past: (slock-AF_INET){+.-...} and interrupts could create inverse lock ordering between them. other info that might help us debug this: 1 lock held by sctp_darn/1517: #0: (sk_lock-AF_INET){+.+.+.}, at: [<cdfe363d>] sctp_sendmsg+0x23d/0xc00 [sctp] Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com> Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| * | Merge branch 'urgent' of ↵Linus Torvalds2010-04-282-9/+6
| |\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/brodo/pcmcia-2.6 * 'urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/brodo/pcmcia-2.6: pcmcia: fix matching rules for pseudo-multi-function cards pcmcia: pcmcia_dev_present bugfix
| | * | pcmcia: pcmcia_dev_present bugfixDominik Brodowski2010-04-212-9/+6
| | |/ | | | | | | | | | | | | | | | | | | | | | | | | pcmcia_dev_present is in and by itself buggy. Add a note specifying why it is broken, and replace the broken locking -- taking a mutex is a bad idea in IRQ context, from which this function is rarely called -- by an atomic_t. Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
| * | Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-blockLinus Torvalds2010-04-284-0/+10
| |\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * 'for-linus' of git://git.kernel.dk/linux-2.6-block: coda: move backing-dev.h kernel include inside __KERNEL__ mtd: ensure that bdi entries are properly initialized and registered Move mtd_bdi_*mappable to mtdcore.c btrfs: convert to using bdi_setup_and_register() Catch filesystems lacking s_bdi drbd: Terminate a connection early if sending the protocol fails drbd: fix memory leak Fix JFFS2 sync silent failure smbfs: add bdi backing to mount session ncpfs: add bdi backing to mount session exofs: add bdi backing to mount session ecryptfs: add bdi backing to mount session coda: add bdi backing to mount session cifs: add bdi backing to mount session afs: add bdi backing to mount session. 9p: add bdi backing to mount session bdi: add helper function for doing init and register of a bdi for a file system block: ensure jiffies wrap is handled correctly in blk_rq_timed_out_timer
| | * | coda: move backing-dev.h kernel include inside __KERNEL__Jens Axboe2010-04-281-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Otherwise we must export backing-dev.h as well, which doesn't make any sense. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
| | * | Catch filesystems lacking s_bdiJörn Engel2010-04-251-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | noop_backing_dev_info is used only as a flag to mark filesystems that don't have any backing store, like tmpfs, procfs, spufs, etc. Signed-off-by: Joern Engel <joern@logfs.org> Changed the BUG_ON() to a WARN_ON(). Note that adding dirty inodes to the noop_backing_dev_info is not legal and will not result in them being flushed, but we already catch this condition in __mark_inode_dirty() when checking for a registered bdi. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
| | * | smbfs: add bdi backing to mount sessionJens Axboe2010-04-221-0/+3
| | | | | | | | | | | | | | | | | | | | | | | | This ensures that dirty data gets flushed properly. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
| | * | ncpfs: add bdi backing to mount sessionJens Axboe2010-04-221-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | This ensures that dirty data gets flushed properly. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
| | * | coda: add bdi backing to mount sessionJens Axboe2010-04-221-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | This ensures that dirty data gets flushed properly. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
| | * | bdi: add helper function for doing init and register of a bdi for a file systemJens Axboe2010-04-221-0/+1
| | |/ | | | | | | | | | | | | | | | | | | | | | Pretty trivial helper, just sets up the bdi and registers it. An atomic sequence count is used to ensure that the registered sysfs names are unique. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
| * | hugetlb: fix infinite loop in get_futex_key() when backed by huge pagesMel Gorman2010-04-241-0/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If a futex key happens to be located within a huge page mapped MAP_PRIVATE, get_futex_key() can go into an infinite loop waiting for a page->mapping that will never exist. See https://bugzilla.redhat.com/show_bug.cgi?id=552257 for more details about the problem. This patch makes page->mapping a poisoned value that includes PAGE_MAPPING_ANON mapped MAP_PRIVATE. This is enough for futex to continue but because of PAGE_MAPPING_ANON, the poisoned value is not dereferenced or used by futex. No other part of the VM should be dereferencing the page->mapping of a hugetlbfs page as its page cache is not on the LRU. This patch fixes the problem with the test case described in the bugzilla. [akpm@linux-foundation.org: mel cant spel] Signed-off-by: Mel Gorman <mel@csn.ul.ie> Acked-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Darren Hart <darren@dvhart.com> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| * | Cleanup generic block based fiemapJosef Bacik2010-04-231-2/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This cleans up a few of the complaints of __generic_block_fiemap. I've fixed all the typing stuff, used inline functions instead of macros, gotten rid of a couple of variables, and made sure the size and block requests are all block aligned. It also fixes a problem where sometimes FIEMAP_EXTENT_LAST wasn't being set properly. Signed-off-by: Josef Bacik <josef@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| * | Merge branch 'for-linus' of ↵Linus Torvalds2010-04-222-2/+2
| |\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6: firewire: ohci: wait for local CSR lock access to finish firewire: ohci: prevent aliasing of locally handled register addresses firewire: core: fw_iso_resource_manage: return -EBUSY when out of resources firewire: core: fix retries calculation in iso manage_channel() firewire: cdev: fix cut+paste mistake in disclaimer
| | * | firewire: cdev: fix cut+paste mistake in disclaimerStefan Richter2010-04-152-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This was supposed to be generic "authors or copyright holders"; I mistakenly picked up text from a wrong file. Reported-by: Daniel K. <dk@uw.no> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
| * | | Merge branch 'for-linus' of ↵Linus Torvalds2010-04-211-2/+6
| |\ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/lrg/voltage-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/lrg/voltage-2.6: mc13783-regulator: fix a memory leak in mc13783_regulator_remove regulator: Let drivers know when they use the stub API
| | * | | regulator: Let drivers know when they use the stub APIJean Delvare2010-04-191-2/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Have the stub variant of regulator_get() return NULL, so that drivers can (but still don't have to) handle this case specifically. Signed-off-by: Jean Delvare <khali@linux-fr.org> Cc: Mark Brown <broonie@opensource.wolfsonmicro.com> Cc: Jerome Oufella <jerome.oufella@savoirfairelinux.com> Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
| * | | | KVM: Increase NR_IOBUS_DEVS limit to 200Sridhar Samudrala2010-04-201-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch increases the current hardcoded limit of NR_IOBUS_DEVS from 6 to 200. We are hitting this limit when creating a guest with more than 1 virtio-net device using vhost-net backend. Each virtio-net device requires 2 such devices to service notifications from rx/tx queues. Signed-off-by: Sridhar Samudrala <sri@us.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
| * | | | KVM: fix the handling of dirty bitmaps to avoid overflowsTakuya Yoshikawa2010-04-201-0/+5
| | |_|/ | |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Int is not long enough to store the size of a dirty bitmap. This patch fixes this problem with the introduction of a wrapper function to calculate the sizes of dirty bitmaps. Note: in mark_page_dirty(), we have to consider the fact that __set_bit() takes the offset as int, not long. Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
| * | | Merge branch 'core-fixes-for-linus' of ↵Linus Torvalds2010-04-191-9/+56
| |\ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: rcu: Make RCU lockdep check the lockdep_recursion variable rcu: Update docs for rcu_access_pointer and rcu_dereference_protected rcu: Better explain the condition parameter of rcu_dereference_check() rcu: Add rcu_access_pointer and rcu_dereference_protected
| | * | | rcu: Make RCU lockdep check the lockdep_recursion variablePaul E. McKenney2010-04-191-4/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The lockdep facility temporarily disables lockdep checking by incrementing the current->lockdep_recursion variable. Such disabling happens in NMIs and in other situations where lockdep might expect to recurse on itself. This patch therefore checks current->lockdep_recursion, disabling RCU lockdep splats when this variable is non-zero. In addition, this patch removes the "likely()", as suggested by Lai Jiangshan. Reported-by: Frederic Weisbecker <fweisbec@gmail.com> Reported-by: David Miller <davem@davemloft.net> Tested-by: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: laijs@cn.fujitsu.com Cc: dipankar@in.ibm.com Cc: mathieu.desnoyers@polymtl.ca Cc: josh@joshtriplett.org Cc: dvhltc@us.ibm.com Cc: niv@us.ibm.com Cc: peterz@infradead.org Cc: rostedt@goodmis.org Cc: Valdis.Kletnieks@vt.edu Cc: dhowells@redhat.com Cc: eric.dumazet@gmail.com LKML-Reference: <20100415195039.GA22623@linux.vnet.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| | * | | rcu: Better explain the condition parameter of rcu_dereference_check()David Howells2010-04-141-5/+23
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Better explain the condition parameter of rcu_dereference_check() that describes the conditions under which the dereference is permitted to take place (and incorporate Yong Zhang's suggestion). This condition is only checked under lockdep proving. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: laijs@cn.fujitsu.com Cc: dipankar@in.ibm.com Cc: mathieu.desnoyers@polymtl.ca Cc: josh@joshtriplett.org Cc: dvhltc@us.ibm.com Cc: niv@us.ibm.com Cc: peterz@infradead.org Cc: rostedt@goodmis.org Cc: Valdis.Kletnieks@vt.edu Cc: eric.dumazet@gmail.com LKML-Reference: <1270852752-25278-2-git-send-email-paulmck@linux.vnet.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| | * | | rcu: Add rcu_access_pointer and rcu_dereference_protectedPaul E. McKenney2010-04-141-0/+32
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch adds variants of rcu_dereference() that handle situations where the RCU-protected data structure cannot change, perhaps due to our holding the update-side lock, or where the RCU-protected pointer is only to be fetched, not dereferenced. These are needed due to some performance concerns with using rcu_dereference() where it is not required, aside from the need for lockdep/sparse checking. The new rcu_access_pointer() primitive is for the case where the pointer is be fetch and not dereferenced. This primitive may be used without protection, RCU or otherwise, due to the fact that it uses ACCESS_ONCE(). The new rcu_dereference_protected() primitive is for the case where updates are prevented, for example, due to holding the update-side lock. This primitive does neither ACCESS_ONCE() nor smp_read_barrier_depends(), so can only be used when updates are somehow prevented. Suggested-by: David Howells <dhowells@redhat.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: laijs@cn.fujitsu.com Cc: dipankar@in.ibm.com Cc: mathieu.desnoyers@polymtl.ca Cc: josh@joshtriplett.org Cc: dvhltc@us.ibm.com Cc: niv@us.ibm.com Cc: peterz@infradead.org Cc: rostedt@goodmis.org Cc: Valdis.Kletnieks@vt.edu Cc: dhowells@redhat.com Cc: eric.dumazet@gmail.com LKML-Reference: <1270852752-25278-1-git-send-email-paulmck@linux.vnet.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | | | Merge branch 'drm-linus' of ↵Linus Torvalds2010-04-191-0/+1
| |\ \ \ \ | | |_|/ / | |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6 * 'drm-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6: drm/radeon/kms: add FireMV 2400 PCI ID. drm/radeon/kms: allow R500 regs VAP_ALT_NUM_VERTICES and VAP_INDEX_OFFSET drivers/gpu/radeon: Add MSPOS regs to safe list. drm/radeon/kms: disable the tv encoder when tv/cv is not in use drm/radeon/kms: adjust pll settings for tv drm/radeon/kms: fix tv dac conflict resolver drm/radeon/kms/evergreen: don't enable hdmi audio stuff drm/radeon/kms/atom: fix dual-link DVI on DCE3.2/4.0 drm/radeon/kms: fix rs600 tlb flush drm/radeon/kms: print GPU family and device id when loading drm/radeon/kms: fix calculation of mipmapped 3D texture sizes drm/radeon/kms: only change mode when coherent value changes. drm/radeon/kms: more atom parser fixes (v2)
| | * | | drm/radeon/kms: add FireMV 2400 PCI ID.Dave Airlie2010-04-191-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This is an M24/X600 chip. From RH# 581927 cc: stable@kernel.org Signed-off-by: Dave Airlie <airlied@redhat.com>
| * | | | Merge branch 'for-linus' of ↵Linus Torvalds2010-04-152-25/+82
| |\ \ \ \ | | | |_|/ | | |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6: firewire: cdev: change license of exported header files to MIT license firewire: cdev: comment fixlet firewire: cdev: iso packet documentation firewire: cdev: fix information leak firewire: cdev: require quadlet-aligned headers for transmit packets firewire: cdev: disallow receive packets without header
| | * | | firewire: cdev: change license of exported header files to MIT licenseStefan Richter2010-04-152-17/+47
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Among else, this allows projects like libdc1394 to carry copies of the ABI related header files without them or distributors having to worry about effects on the project's overall license terms. Switch to MIT license as suggested by Kristian. Also update the year in the copyright statement according to source history. Cc: Jay Fenlason <fenlason@redhat.com> Acked-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> Signed-off-by: Kristian Høgsberg <krh@bitplanet.net>
| | * | | firewire: cdev: comment fixletStefan Richter2010-04-101-2/+2
| | | | | | | | | | | | | | | | | | | | Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
| | * | | firewire: cdev: iso packet documentationClemens Ladisch2010-04-101-6/+33
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add the missing documentation for iso packets. Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
| * | | | Merge branch 'for-linus' of ↵Linus Torvalds2010-04-151-0/+2
| |\ \ \ \ | | |_|_|/ | |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input: Input: wacom - switch mode upon system resume Revert "Input: wacom - merge out and in prox events" Input: matrix_keypad - allow platform to disable key autorepeat Input: ALPS - add signature for HP Pavilion dm3 laptops Input: i8042 - spelling fix Input: sparse-keymap - implement safer freeing of the keymap Input: update the status of the Multitouch X driver project Input: clarify the no-finger event in multitouch protocol Input: bcm5974 - retract efi-broken suspend_resume Input: sparse-keymap - free the right keymap on error
| | * | | Input: matrix_keypad - allow platform to disable key autorepeatH Hartley Sweeten2010-04-051-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In an embedded system the matrix_keypad driver might be used to interface with an external control panel and not an actual keyboard. On the control panel some of the keys could be used to turn on/off various functions. If key autorepeat is enabled this causes the function to quickly toggle between the on and off states and makes operation difficult. Add an option in the platform-specific data to disable the key autorepeat. Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
| * | | | Merge branch 'bugfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6Linus Torvalds2010-04-131-0/+1
| |\ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * 'bugfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6: NFSv4: fix delegated locking NFS: Ensure that the WRITE and COMMIT RPC calls are always uninterruptible NFS: Fix a race with the new commit code NFS: Ensure that writeback_single_inode() calls write_inode() when syncing NFS: Fix the mode calculation in nfs_find_open_context NFSv4: Fall back to ordinary lookup if nfs4_atomic_open() returns EISDIR
| | * | | | NFSv4: fix delegated lockingTrond Myklebust2010-04-121-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Arnaud Giersch reports that NFSv4 locking is broken when we hold a delegation since commit 8e469ebd6dc32cbaf620e134d79f740bf0ebab79 (NFSv4: Don't allow posix locking against servers that don't support it). According to Arnaud, the lock succeeds the first time he opens the file (since we cannot do a delegated open) but then fails after we start using delegated opens. The following patch fixes it by ensuring that locking behaviour is governed by a per-filesystem capability flag that is initially set, but gets cleared if the server ever returns an OPEN without the NFS4_OPEN_RESULT_LOCKTYPE_POSIX flag being set. Reported-by: Arnaud Giersch <arnaud.giersch@iut-bm.univ-fcomte.fr> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> Cc: stable@kernel.org
| * | | | | Merge branch 'master' of /home/davem/src/GIT/linux-2.6/David S. Miller2010-04-1171-175/+411
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| * | | | | x25: Patch to fix bug 15678 - x25 accesses fields beyond end of packet.John Hughes2010-04-071-0/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Here is a patch to stop X.25 examining fields beyond the end of the packet. For example, when a simple CALL ACCEPTED was received: 10 10 0f x25_parse_facilities was attempting to decode the FACILITIES field, but this packet contains no facilities field. Signed-off-by: John Hughes <john@calva.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | | | | | blkdev: add blkdev_issue_zeroout helper functionDmitry Monakhov2010-04-281-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - Add bio_batch helper primitive. This is rather generic primitive for submitting/waiting a complex request which consists of several bios. - blkdev_issue_zeroout() generate number of zero filed write bios. Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* | | | | | blkdev: generalize flags for blkdev_issue_fn functionsDmitry Monakhov2010-04-281-7/+11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The patch just convert all blkdev_issue_xxx function to common set of flags. Wait/allocation semantics preserved. Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* | | | | | block: implement bd_claiming and claiming blockTejun Heo2010-04-271-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently, device claiming for exclusive open is done after low level open - disk->fops->open() - has completed successfully. This means that exclusive open attempts while a device is already exclusively open will fail only after disk->fops->open() is called. cdrom driver issues commands during open() which means that O_EXCL open attempt can unintentionally inject commands to in-progress command stream for burning thus disturbing burning process. In most cases, this doesn't cause problems because the first command to be issued is TUR which most devices can process in the middle of burning. However, depending on how a device replies to TUR during burning, cdrom driver may end up issuing further commands. This can't be resolved trivially by moving bd_claim() before doing actual open() because that means an open attempt which will end up failing could interfere other legit O_EXCL open attempts. ie. unconfirmed open attempts can fail others. This patch resolves the problem by introducing claiming block which is started by bd_start_claiming() and terminated either by bd_claim() or bd_abort_claiming(). bd_claim() from inside a claiming block is guaranteed to succeed and once a claiming block is started, other bd_start_claiming() or bd_claim() attempts block till the current claiming block is terminated. bd_claim() can still be used standalone although now it always synchronizes against claiming blocks, so the existing users will keep working without any change. blkdev_open() and open_bdev_exclusive() are converted to use claiming blocks so that exclusive open attempts from these functions don't interfere with the existing exclusive open. This problem was discovered while investigating bko#15403. https://bugzilla.kernel.org/show_bug.cgi?id=15403 The burning problem itself can be resolved by updating userspace probing tools to always open w/ O_EXCL. Signed-off-by: Tejun Heo <tj@kernel.org> Reported-by: Matthias-Christian Ott <ott@mirix.org> Cc: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
generated by cgit v1.2.3 (git 2.25.1) at 2024-09-24 10:30:18 +0000