- 29 8月, 2014 1 次提交
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由 Joe Lawrence 提交于
The blk_get_request function may fail in low-memory conditions or during device removal (even if __GFP_WAIT is set). To distinguish between these errors, modify the blk_get_request call stack to return the appropriate ERR_PTR. Verify that all callers check the return status and consider IS_ERR instead of a simple NULL pointer check. For consistency, make a similar change to the blk_mq_alloc_request leg of blk_get_request. It may fail if the queue is dead, or the caller was unwilling to wait. Signed-off-by: NJoe Lawrence <joe.lawrence@stratus.com> Acked-by: Jiri Kosina <jkosina@suse.cz> [for pktdvd] Acked-by: Boaz Harrosh <bharrosh@panasas.com> [for osd] Reviewed-by: NJeff Moyer <jmoyer@redhat.com> Signed-off-by: NJens Axboe <axboe@fb.com>
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- 25 7月, 2014 1 次提交
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由 Christoph Hellwig 提交于
Avoid taking the queue_lock to check the per-device queue limit. Instead we do an atomic_inc_return early on to grab our slot in the queue, and if necessary decrement it after finishing all checks. Unlike the host and target busy counters this doesn't allow us to avoid the queue_lock in the request_fn due to the way the interface works, but it'll allow us to prepare for using the blk-mq code, which doesn't use the queue_lock at all, and it at least avoids a queue_lock round trip in scsi_device_unbusy, which is still important given how busy the queue_lock is. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NHannes Reinecke <hare@suse.de> Reviewed-by: NWebb Scales <webbnh@hp.com> Acked-by: NJens Axboe <axboe@kernel.dk> Tested-by: NBart Van Assche <bvanassche@acm.org> Tested-by: NRobert Elliott <elliott@hp.com>
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- 18 7月, 2014 6 次提交
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由 Hannes Reinecke 提交于
Update the sg driver to use dev_printk() variants instead of plain printk(); this will prefix logging messages with the appropriate device. Signed-off-by: NHannes Reinecke <hare@suse.de> Acked-by: NDoug Gilbert <dgilbert@interlog.com> Reviewed-by: NMartin K. Petersen <martin.petersen@oracle.com> Reviewed-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NChristoph Hellwig <hch@lst.de>
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由 Hannes Reinecke 提交于
The SCSI standard defines 64-bit values for LUNs, and large arrays employing large or hierarchical LUN numbers become more and more common. So update the linux SCSI stack to use 64-bit LUN numbers. Signed-off-by: NHannes Reinecke <hare@suse.de> Reviewed-by: NChristoph Hellwig <hch@infradead.org> Reviewed-by: NEwan Milne <emilne@redhat.com> Signed-off-by: NChristoph Hellwig <hch@lst.de>
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由 Douglas Gilbert 提交于
This addresses a problem reported by Vaughan Cao concerning the correctness of the O_EXCL logic in the sg driver. POSIX doesn't defined O_EXCL semantics on devices but "allow only one open file descriptor at a time per sg device" is a rough definition. The sg driver's semantics have been to wait on an open() when O_NONBLOCK is not given and there are O_EXCL headwinds. Nasty things can happen during that wait such as the device being detached (removed). So multiple locks are reworked in this patch making it large and hard to break down into digestible bits. This patch is against Linus's current git repository which doesn't include any sg patches sent in the last few weeks. Hence this patch touches as little as possible that it doesn't need to and strips out most SCSI_LOG_TIMEOUT() changes in v3 because Hannes said he was going to rework all that stuff. The sg3_utils package has several test programs written to test this patch. See examples/sg_tst_excl*.cpp . Not all the locks and flags in sg have been re-worked in this patch, notably sg_request::done . That can wait for a follow-up patch if this one meets with approval. Signed-off-by: NDouglas Gilbert <dgilbert@interlog.com> Reviewed-by: NHannes Reinecke <hare@suse.de>
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由 Douglas Gilbert 提交于
When the SG_IO ioctl was copied into the block layer and later into the bsg driver, subtle differences emerged. One difference is the way injected commands are queued through the block layer (i.e. this is not SCSI device queueing nor SATA NCQ). Summarizing: - SG_IO in the block layer: blk_exec*(at_head=false) - sg SG_IO: at_head=true - bsg SG_IO: at_head=true Some time ago Boaz Harrosh introduced a sg v4 flag called BSG_FLAG_Q_AT_TAIL to override the bsg driver default. This patch does the equivalent for the sg driver. ChangeLog: Introduce SG_FLAG_Q_AT_TAIL flag to cause commands to be injected into the block layer with at_head=false. Signed-off-by: NDouglas Gilbert <dgilbert@interlog.com> Reviewed-by: NMike Christie <michaelc@cs.wisc.edu> Reviewed-by: NEwan D. Milne <emilne@redhat.com> Signed-off-by: NChristoph Hellwig <hch@lst.de>
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由 Douglas Gilbert 提交于
- remove the 16 byte CDB (SCSI command) length limit from the sg driver by handling longer CDBs the same way as the bsg driver. Remove comment from sg.h public interface about the cmd_len field being limited to 16 bytes. - remove some dead code caused by this change - cleanup comment block at the top of sg.h, fix urls Signed-off-by: NDouglas Gilbert <dgilbert@interlog.com> Reviewed-by: NMike Christie <michaelc@cs.wisc.edu> Reviewed-by: NHannes Reinecke <hare@suse.de> Signed-off-by: NChristoph Hellwig <hch@lst.de>
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由 Akinobu Mita 提交于
This prevents integer overflow when converting the request queue's max_sectors from sectors to bytes. However, this is a preparation for extending the data type of max_sectors in struct Scsi_Host and scsi_host_template. So, it is impossible to happen this integer overflow for now, because SCSI low-level drivers can not specify max_sectors greater than 0xffff due to the data type limitation. Signed-off-by: NAkinobu Mita <akinobu.mita@gmail.com> Acked by: Douglas Gilbert <dgilbert@interlog.com> Signed-off-by: NChristoph Hellwig <hch@lst.de>
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- 06 6月, 2014 1 次提交
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由 Jens Axboe 提交于
With the optimizations around not clearing the full request at alloc time, we are leaving some of the needed init for REQ_TYPE_BLOCK_PC up to the user allocating the request. Add a blk_rq_set_block_pc() that sets the command type to REQ_TYPE_BLOCK_PC, and properly initializes the members associated with this type of request. Update callers to use this function instead of manipulating rq->cmd_type directly. Includes fixes from Christoph Hellwig <hch@lst.de> for my half-assed attempt. Signed-off-by: NJens Axboe <axboe@fb.com>
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- 25 10月, 2013 4 次提交
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由 James Bottomley 提交于
This reverts commit 15b06f9a. This is one of four patches that was causing this bug [ 205.372823] ================================================ [ 205.372901] [ BUG: lock held when returning to user space! ] [ 205.372979] 3.12.0-rc6-hw-debug-pagealloc+ #67 Not tainted [ 205.373055] ------------------------------------------------ [ 205.373132] megarc.bin/5283 is leaving the kernel with locks still held! [ 205.373212] 1 lock held by megarc.bin/5283: [ 205.373285] #0: (&sdp->o_sem){.+.+..}, at: [<ffffffff8161e650>] sg_open+0x3a0/0x4d0 Cc: Vaughan Cao <vaughan.cao@oracle.com> Acked-by: NDouglas Gilbert <dgilbert@interlog.com> Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>
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由 James Bottomley 提交于
This reverts commit 00b2d9d6. This is one of four patches that was causing this bug [ 205.372823] ================================================ [ 205.372901] [ BUG: lock held when returning to user space! ] [ 205.372979] 3.12.0-rc6-hw-debug-pagealloc+ #67 Not tainted [ 205.373055] ------------------------------------------------ [ 205.373132] megarc.bin/5283 is leaving the kernel with locks still held! [ 205.373212] 1 lock held by megarc.bin/5283: [ 205.373285] #0: (&sdp->o_sem){.+.+..}, at: [<ffffffff8161e650>] sg_open+0x3a0/0x4d0 Cc: Vaughan Cao <vaughan.cao@oracle.com> Acked-by: NDouglas Gilbert <dgilbert@interlog.com> Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>
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由 James Bottomley 提交于
This reverts commit e32c9e63. This is one of four patches that was causing this bug [ 205.372823] ================================================ [ 205.372901] [ BUG: lock held when returning to user space! ] [ 205.372979] 3.12.0-rc6-hw-debug-pagealloc+ #67 Not tainted [ 205.373055] ------------------------------------------------ [ 205.373132] megarc.bin/5283 is leaving the kernel with locks still held! [ 205.373212] 1 lock held by megarc.bin/5283: [ 205.373285] #0: (&sdp->o_sem){.+.+..}, at: [<ffffffff8161e650>] sg_open+0x3a0/0x4d0 Cc: Vaughan Cao <vaughan.cao@oracle.com> Acked-by: NDouglas Gilbert <dgilbert@interlog.com> Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>
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由 James Bottomley 提交于
This reverts commit 1f962ebc. This is one of four patches that was causing this bug [ 205.372823] ================================================ [ 205.372901] [ BUG: lock held when returning to user space! ] [ 205.372979] 3.12.0-rc6-hw-debug-pagealloc+ #67 Not tainted [ 205.373055] ------------------------------------------------ [ 205.373132] megarc.bin/5283 is leaving the kernel with locks still held! [ 205.373212] 1 lock held by megarc.bin/5283: [ 205.373285] #0: (&sdp->o_sem){.+.+..}, at: [<ffffffff8161e650>] sg_open+0x3a0/0x4d0 Cc: Vaughan Cao <vaughan.cao@oracle.com> Acked-by: NDouglas Gilbert <dgilbert@interlog.com> Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>
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- 03 9月, 2013 4 次提交
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由 Vaughan Cao 提交于
Push file descriptor list locking down to per-device locking. Let sg_index_lock only protect device lookup. sdp->detached is also set and checked with this lock held. Signed-off-by: NVaughan Cao <vaughan.cao@oracle.com> Acked-by: NDouglas Gilbert <dgilbert@interlog.com> Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>
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由 Vaughan Cao 提交于
@Detached is set under the protection of sg_index_lock. Without getting the lock, new sfp will be added during sg removal and there is no chance for it to be picked out. So check with sg_index_lock held in sg_add_sfp(). Signed-off-by: NVaughan Cao <vaughan.cao@oracle.com> Acked-by: NDouglas Gilbert <dgilbert@interlog.com> Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>
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由 Vaughan Cao 提交于
Open exclusive check is protected by o_sem, no need sg_open_exclusive_lock. @exclude is used to record which type of rwsem we are holding. Signed-off-by: NVaughan Cao <vaughan.cao@oracle.com> Acked-by: NDouglas Gilbert <dgilbert@interlog.com> Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>
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由 Vaughan Cao 提交于
A race condition may happen if two threads are both trying to open the same sg with O_EXCL simultaneously. It's possible that they both find fsds list is empty and get_exclude(sdp) returns 0, then they both call set_exclude() and break out from wait_event_interruptible and resume open. Now use rwsem to protect this process. Exclusive open gets write lock and others get read lock. The lock will be held until file descriptor is closed. This also leads 'exclude' only a status rather than a check mark. Signed-off-by: NVaughan Cao <vaughan.cao@oracle.com> Acked-by: NDouglas Gilbert <dgilbert@interlog.com> Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>
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- 08 5月, 2013 1 次提交
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由 Kent Overstreet 提交于
Faster kernel compiles by way of fewer unnecessary includes. [akpm@linux-foundation.org: fix fallout] [akpm@linux-foundation.org: fix build] Signed-off-by: NKent Overstreet <koverstreet@google.com> Cc: Zach Brown <zab@redhat.com> Cc: Felipe Balbi <balbi@ti.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Mark Fasheh <mfasheh@suse.com> Cc: Joel Becker <jlbec@evilplan.org> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Jens Axboe <axboe@kernel.dk> Cc: Asai Thambi S P <asamymuthupa@micron.com> Cc: Selvan Mani <smani@micron.com> Cc: Sam Bradshaw <sbradshaw@micron.com> Cc: Jeff Moyer <jmoyer@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Benjamin LaHaise <bcrl@kvack.org> Reviewed-by: N"Theodore Ts'o" <tytso@mit.edu> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 28 2月, 2013 1 次提交
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由 Tejun Heo 提交于
Convert to the much saner new idr interface. Signed-off-by: NTejun Heo <tj@kernel.org> Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 09 10月, 2012 1 次提交
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由 Konstantin Khlebnikov 提交于
A long time ago, in v2.4, VM_RESERVED kept swapout process off VMA, currently it lost original meaning but still has some effects: | effect | alternative flags -+------------------------+--------------------------------------------- 1| account as reserved_vm | VM_IO 2| skip in core dump | VM_IO, VM_DONTDUMP 3| do not merge or expand | VM_IO, VM_DONTEXPAND, VM_HUGETLB, VM_PFNMAP 4| do not mlock | VM_IO, VM_DONTEXPAND, VM_HUGETLB, VM_PFNMAP This patch removes reserved_vm counter from mm_struct. Seems like nobody cares about it, it does not exported into userspace directly, it only reduces total_vm showed in proc. Thus VM_RESERVED can be replaced with VM_IO or pair VM_DONTEXPAND | VM_DONTDUMP. remap_pfn_range() and io_remap_pfn_range() set VM_IO|VM_DONTEXPAND|VM_DONTDUMP. remap_vmalloc_range() set VM_DONTEXPAND | VM_DONTDUMP. [akpm@linux-foundation.org: drivers/vfio/pci/vfio_pci.c fixup] Signed-off-by: NKonstantin Khlebnikov <khlebnikov@openvz.org> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Carsten Otte <cotte@de.ibm.com> Cc: Chris Metcalf <cmetcalf@tilera.com> Cc: Cyrill Gorcunov <gorcunov@openvz.org> Cc: Eric Paris <eparis@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Hugh Dickins <hughd@google.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: James Morris <james.l.morris@oracle.com> Cc: Jason Baron <jbaron@redhat.com> Cc: Kentaro Takeda <takedakn@nttdata.co.jp> Cc: Matt Helsley <matthltc@us.ibm.com> Cc: Nick Piggin <npiggin@kernel.dk> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Robert Richter <robert.richter@amd.com> Cc: Suresh Siddha <suresh.b.siddha@intel.com> Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Cc: Venkatesh Pallipadi <venki@google.com> Acked-by: NLinus Torvalds <torvalds@linux-foundation.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 17 5月, 2012 9 次提交
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由 Jörn Engel 提交于
Signed-off-by: NJoern Engel <joern@logfs.org> Acked-by: NDouglas Gilbert <dgilbert@interlog.com> Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>
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由 Jörn Engel 提交于
With the exception of the detached field, sg_mutex no longer adds any locking. detached handling has been broken before and is still broken and this patch does not seem to make things worse than they were to begin with. However, I have observed cases of tasks being blocked for >200s waiting for sg_mutex. So the removal clearly adds value for very little cost. Signed-off-by: NJoern Engel <joern@logfs.org> Acked-by: NDouglas Gilbert <dgilbert@interlog.com> Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>
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由 Jörn Engel 提交于
sfds is protected by sg_index_lock - except for sg_open(), where it isn't. Change that and add some documentation. Signed-off-by: NJoern Engel <joern@logfs.org> Acked-by: NDouglas Gilbert <dgilbert@interlog.com> Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>
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由 Jörn Engel 提交于
Changes since v1: set_exclude now returns the new value, which gets rid of the comma expression and the operator precedence bug. Thanks to Douglas for spotting it. sdp->exclude was previously protected by the BKL. The sg_mutex, which replaced the BKL, only semi-protected it, as it was missing from sg_release() and sg_proc_seq_show_debug(). Take an explicit spinlock for it. Signed-off-by: NJoern Engel <joern@logfs.org> Acked-by: NDouglas Gilbert <dgilbert@interlog.com> Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>
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由 Jörn Engel 提交于
srp->done is protected by sfp->rq_list_lock everywhere, except for this one case. Result can be that the wake-up happens before the cacheline with the changed srp->done has arrived, so the waiter can go back to sleep and never be woken up again. The wait_event_interruptible() means that anyone trying to debug this unlikely race will likely notice everything working fine again, as the next signal will unwedge things. Evil. Signed-off-by: NJoern Engel <joern@logfs.org> Acked-by: NDouglas Gilbert <dgilbert@interlog.com> Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>
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由 Jörn Engel 提交于
After sg_release() has been called, noone should be able to actually use that filedescriptor anymore. So if closed ever made a difference in the past five years or so, it would have meant a bug. Remove it. Signed-off-by: NJoern Engel <joern@logfs.org> Acked-by: NDouglas Gilbert <dgilbert@interlog.com> [jejb: fix up checkpatch warnings] Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>
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由 Jörn Engel 提交于
Afaics the use of __wait_event_interruptible() as opposed to wait_event_interruptible() is purely historic. So let's follow the rest of the kernel and check the condition before prepare_to_wait() - and also make the code a bit nicer. Signed-off-by: NJoern Engel <joern@logfs.org> Acked-by: NDouglas Gilbert <dgilbert@interlog.com> Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>
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由 Jörn Engel 提交于
The while (1) construct isn't actually a loop at all. So let's not pretent and obfuscate the code. Signed-off-by: NJoern Engel <joern@logfs.org> Acked-by: NDouglas Gilbert <dgilbert@interlog.com> Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>
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由 Jörn Engel 提交于
blocking is de-facto a constant and the now-removed comment wasn't all that useful either. Without them and the resulting indentation the code is a bit nicer to read. Signed-off-by: NJoern Engel <joern@logfs.org> Acked-by: NDouglas Gilbert <dgilbert@interlog.com> Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>
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- 16 1月, 2012 1 次提交
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由 Stephen Boyd 提交于
Instead of open coding this function use kstrtoul_from_user() directly. Signed-off-by: NStephen Boyd <sboyd@codeaurora.org> Acked-by: NDouglas Gilbert <dgilbert@interlog.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>
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- 04 1月, 2012 1 次提交
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由 Al Viro 提交于
both proc_dir_entry ->mode and populating functions Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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- 15 9月, 2011 1 次提交
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由 Christian Dietrich 提交于
Since printk_ratelimit() shouldn't be used anymore (see comment in include/linux/printk.h), replace it with printk_ratelimited. Signed-off-by: NChristian Dietrich <christian.dietrich@informatik.uni-erlangen.de> Signed-off-by: NJiri Kosina <jkosina@suse.cz>
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- 15 10月, 2010 1 次提交
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由 Arnd Bergmann 提交于
All file_operations should get a .llseek operation so we can make nonseekable_open the default for future file operations without a .llseek pointer. The three cases that we can automatically detect are no_llseek, seq_lseek and default_llseek. For cases where we can we can automatically prove that the file offset is always ignored, we use noop_llseek, which maintains the current behavior of not returning an error from a seek. New drivers should normally not use noop_llseek but instead use no_llseek and call nonseekable_open at open time. Existing drivers can be converted to do the same when the maintainer knows for certain that no user code relies on calling seek on the device file. The generated code is often incorrectly indented and right now contains comments that clarify for each added line why a specific variant was chosen. In the version that gets submitted upstream, the comments will be gone and I will manually fix the indentation, because there does not seem to be a way to do that using coccinelle. Some amount of new code is currently sitting in linux-next that should get the same modifications, which I will do at the end of the merge window. Many thanks to Julia Lawall for helping me learn to write a semantic patch that does all this. ===== begin semantic patch ===== // This adds an llseek= method to all file operations, // as a preparation for making no_llseek the default. // // The rules are // - use no_llseek explicitly if we do nonseekable_open // - use seq_lseek for sequential files // - use default_llseek if we know we access f_pos // - use noop_llseek if we know we don't access f_pos, // but we still want to allow users to call lseek // @ open1 exists @ identifier nested_open; @@ nested_open(...) { <+... nonseekable_open(...) ...+> } @ open exists@ identifier open_f; identifier i, f; identifier open1.nested_open; @@ int open_f(struct inode *i, struct file *f) { <+... ( nonseekable_open(...) | nested_open(...) ) ...+> } @ read disable optional_qualifier exists @ identifier read_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; expression E; identifier func; @@ ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off) { <+... ( *off = E | *off += E | func(..., off, ...) | E = *off ) ...+> } @ read_no_fpos disable optional_qualifier exists @ identifier read_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; @@ ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off) { ... when != off } @ write @ identifier write_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; expression E; identifier func; @@ ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off) { <+... ( *off = E | *off += E | func(..., off, ...) | E = *off ) ...+> } @ write_no_fpos @ identifier write_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; @@ ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off) { ... when != off } @ fops0 @ identifier fops; @@ struct file_operations fops = { ... }; @ has_llseek depends on fops0 @ identifier fops0.fops; identifier llseek_f; @@ struct file_operations fops = { ... .llseek = llseek_f, ... }; @ has_read depends on fops0 @ identifier fops0.fops; identifier read_f; @@ struct file_operations fops = { ... .read = read_f, ... }; @ has_write depends on fops0 @ identifier fops0.fops; identifier write_f; @@ struct file_operations fops = { ... .write = write_f, ... }; @ has_open depends on fops0 @ identifier fops0.fops; identifier open_f; @@ struct file_operations fops = { ... .open = open_f, ... }; // use no_llseek if we call nonseekable_open //////////////////////////////////////////// @ nonseekable1 depends on !has_llseek && has_open @ identifier fops0.fops; identifier nso ~= "nonseekable_open"; @@ struct file_operations fops = { ... .open = nso, ... +.llseek = no_llseek, /* nonseekable */ }; @ nonseekable2 depends on !has_llseek @ identifier fops0.fops; identifier open.open_f; @@ struct file_operations fops = { ... .open = open_f, ... +.llseek = no_llseek, /* open uses nonseekable */ }; // use seq_lseek for sequential files ///////////////////////////////////// @ seq depends on !has_llseek @ identifier fops0.fops; identifier sr ~= "seq_read"; @@ struct file_operations fops = { ... .read = sr, ... +.llseek = seq_lseek, /* we have seq_read */ }; // use default_llseek if there is a readdir /////////////////////////////////////////// @ fops1 depends on !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier readdir_e; @@ // any other fop is used that changes pos struct file_operations fops = { ... .readdir = readdir_e, ... +.llseek = default_llseek, /* readdir is present */ }; // use default_llseek if at least one of read/write touches f_pos ///////////////////////////////////////////////////////////////// @ fops2 depends on !fops1 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier read.read_f; @@ // read fops use offset struct file_operations fops = { ... .read = read_f, ... +.llseek = default_llseek, /* read accesses f_pos */ }; @ fops3 depends on !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier write.write_f; @@ // write fops use offset struct file_operations fops = { ... .write = write_f, ... + .llseek = default_llseek, /* write accesses f_pos */ }; // Use noop_llseek if neither read nor write accesses f_pos /////////////////////////////////////////////////////////// @ fops4 depends on !fops1 && !fops2 && !fops3 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier read_no_fpos.read_f; identifier write_no_fpos.write_f; @@ // write fops use offset struct file_operations fops = { ... .write = write_f, .read = read_f, ... +.llseek = noop_llseek, /* read and write both use no f_pos */ }; @ depends on has_write && !has_read && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier write_no_fpos.write_f; @@ struct file_operations fops = { ... .write = write_f, ... +.llseek = noop_llseek, /* write uses no f_pos */ }; @ depends on has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier read_no_fpos.read_f; @@ struct file_operations fops = { ... .read = read_f, ... +.llseek = noop_llseek, /* read uses no f_pos */ }; @ depends on !has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; @@ struct file_operations fops = { ... +.llseek = noop_llseek, /* no read or write fn */ }; ===== End semantic patch ===== Signed-off-by: NArnd Bergmann <arnd@arndb.de> Cc: Julia Lawall <julia@diku.dk> Cc: Christoph Hellwig <hch@infradead.org>
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- 23 9月, 2010 1 次提交
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由 Joe Perches 提交于
Signed-off-by: NJoe Perches <joe@perches.com> Signed-off-by: NJiri Kosina <jkosina@suse.cz>
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- 16 9月, 2010 2 次提交
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由 Namhyung Kim 提交于
2nd argument of blk_rq_aligned() has changed to 'unsigned long' by the previous commit 'block: fix an address space warning in blk-map.c'. That commit neglected to update a user of that function. Signed-off-by: NNamhyung Kim <namhyung@gmail.com> Signed-off-by: NJens Axboe <jaxboe@fusionio.com>
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由 Arnd Bergmann 提交于
All these files use the big kernel lock in a trivial way to serialize their private file operations, typically resulting from an earlier semi-automatic pushdown from VFS. None of these drivers appears to want to lock against other code, and they all use the BKL as the top-level lock in their file operations, meaning that there is no lock-order inversion problem. Consequently, we can remove the BKL completely, replacing it with a per-file mutex in every case. Using a scripted approach means we can avoid typos. file=$1 name=$2 if grep -q lock_kernel ${file} ; then if grep -q 'include.*linux.mutex.h' ${file} ; then sed -i '/include.*<linux\/smp_lock.h>/d' ${file} else sed -i 's/include.*<linux\/smp_lock.h>.*$/include <linux\/mutex.h>/g' ${file} fi sed -i ${file} \ -e "/^#include.*linux.mutex.h/,$ { 1,/^\(static\|int\|long\)/ { /^\(static\|int\|long\)/istatic DEFINE_MUTEX(${name}_mutex); } }" \ -e "s/\(un\)*lock_kernel\>[ ]*()/mutex_\1lock(\&${name}_mutex)/g" \ -e '/[ ]*cycle_kernel_lock();/d' else sed -i -e '/include.*\<smp_lock.h\>/d' ${file} \ -e '/cycle_kernel_lock()/d' fi Signed-off-by: NArnd Bergmann <arnd@arndb.de> Cc: linux-scsi@vger.kernel.org Cc: "James E.J. Bottomley" <James.Bottomley@suse.de>
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- 11 8月, 2010 1 次提交
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由 Julia Lawall 提交于
Use memdup_user when user data is immediately copied into the allocated region. The semantic patch that makes this change is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ expression from,to,size,flag; position p; identifier l1,l2; @@ - to = \(kmalloc@p\|kzalloc@p\)(size,flag); + to = memdup_user(from,size); if ( - to==NULL + IS_ERR(to) || ...) { <+... when != goto l1; - -ENOMEM + PTR_ERR(to) ...+> } - if (copy_from_user(to, from, size) != 0) { - <+... when != goto l2; - -EFAULT - ...+> - } // </smpl> Signed-off-by: NJulia Lawall <julia@diku.dk> Cc: Doug Gilbert <dgilbert@interlog.com> Cc: Boaz Harrosh <bharrosh@panasas.com> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 28 7月, 2010 2 次提交
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由 Alan Stern 提交于
This patch (as1398b) adds runtime PM support to the SCSI layer. Only the machanism is provided; use of it is up to the various high-level drivers, and the patch doesn't change any of them. Except for sg -- the patch expicitly prevents a device from being runtime-suspended while its sg device file is open. The implementation is simplistic. In general, hosts and targets are automatically suspended when all their children are asleep, but for them the runtime-suspend code doesn't actually do anything. (A host's runtime PM status is propagated up the device tree, though, so a runtime-PM-aware lower-level driver could power down the host adapter hardware at the appropriate times.) There are comments indicating where a transport class might be notified or some other hooks added. LUNs are runtime-suspended by calling the drivers' existing suspend handlers (and likewise for runtime-resume). Somewhat arbitrarily, the implementation delays for 100 ms before suspending an eligible LUN. This is because there typically are occasions during bootup when the same device file is opened and closed several times in quick succession. The way this all works is that the SCSI core increments a device's PM-usage count when it is registered. If a high-level driver does nothing then the device will not be eligible for runtime-suspend because of the elevated usage count. If a high-level driver wants to use runtime PM then it can call scsi_autopm_put_device() in its probe routine to decrement the usage count and scsi_autopm_get_device() in its remove routine to restore the original count. Hosts, targets, and LUNs are not suspended while they are being probed or removed, or while the error handler is running. In fact, a fairly large part of the patch consists of code to make sure that things aren't suspended at such times. [jejb: fix up compile issues in PM config variations] Signed-off-by: NAlan Stern <stern@rowland.harvard.edu> Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>
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由 FUJITA Tomonori 提交于
After blk_rq_map_user is successful, if we find that a device is unavailable (was detached), we must call blk_end_request_all to free bio(s) before blk_rq_unmap_user and blk_put_request. Reported-by: N"Dailey, Nate" <Nate.Dailey@stratus.com> Signed-off-by: NFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Tested-by: N"Dailey, Nate" <Nate.Dailey@stratus.com> Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>
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- 17 5月, 2010 1 次提交
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由 Arnd Bergmann 提交于
Push down the bkl into ioctl functions on the scsi layer. [jkacur: Forward declaration missing ';'. Conflicting declaraction in megaraid.h changed Fixed missing inodes declarations] Signed-off-by: NArnd Bergmann <arnd@arndb.de> Signed-off-by: NJohn Kacur <jkacur@redhat.com> Signed-off-by: NFrederic Weisbecker <fweisbec@gmail.com>
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