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path: root/drivers/scsi/sg.c
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2010-08-11drivers/scsi: use memdup_userJulia Lawall
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: Julia 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: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-07-28[SCSI] implement runtime Power ManagementAlan Stern
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: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2010-07-28[SCSI] sg: fix bio leak with a detached deviceFUJITA Tomonori
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: "Dailey, Nate" <Nate.Dailey@stratus.com> Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Tested-by: "Dailey, Nate" <Nate.Dailey@stratus.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2010-05-17scsi: Push down BKL into ioctl functionsArnd Bergmann
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: Arnd Bergmann <arnd@arndb.de> Signed-off-by: John Kacur <jkacur@redhat.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
2010-03-30include cleanup: Update gfp.h and slab.h includes to prepare for breaking ↵Tejun Heo
implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-02-26block: Consolidate phys_segment and hw_segment limitsMartin K. Petersen
Except for SCSI no device drivers distinguish between physical and hardware segment limits. Consolidate the two into a single segment limit. Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2009-10-11Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-rc-fixes-2.6Linus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-rc-fixes-2.6: (34 commits) [SCSI] qla2xxx: Fix NULL ptr deref bug in fail path during queue create [SCSI] st: fix possible memory use after free after MTSETBLK ioctl [SCSI] be2iscsi: Moving to pci_pools v3 [SCSI] libiscsi: iscsi_session_setup to allow for private space [SCSI] be2iscsi: add 10Gbps iSCSI - BladeEngine 2 driver [SCSI] zfcp: Fix hang when offlining device with offline chpid [SCSI] zfcp: Fix lockdep warning when offlining device with offline chpid [SCSI] zfcp: Fix oops during shutdown of offline device [SCSI] zfcp: Fix initial device and cfdc for delayed adapter allocation [SCSI] zfcp: correctly initialize unchained requests [SCSI] mpt2sas: Bump version 02.100.03.00 [SCSI] mpt2sas: Support dev remove when phy status is MPI2_EVENT_SAS_TOPO_PHYSTATUS_VACANT [SCSI] mpt2sas: Timeout occurred within the HANDSHAKE logic while waiting on firmware to ACK. [SCSI] mpt2sas: Call init_completion on a per request basis. [SCSI] mpt2sas: Target Reset will be issued from Interrupt context. [SCSI] mpt2sas: Added SCSIIO, Internal and high priority memory pools to support multiple TM [SCSI] mpt2sas: Copyright change to 2009. [SCSI] mpt2sas: Added mpi2_history.txt for MPI2 headers. [SCSI] mpt2sas: Update driver to MPI2 REV K headers. [SCSI] bfa: Brocade BFA FC SCSI driver ...
2009-10-02[SCSI] sg: Free data buffers after calling blk_rq_unmap_userChristof Schmitt
Running sg_luns on s390x with CONFIG_DEBUG_PAGEALLOC enabled fails with EFAULT from the SG_IO ioctl. The EFAULT is the result from copy_to_user failing in this call chain: sg_ioctl sg_new_read sg_finish_rem_req blk_rq_unmap_user __blk_rq_unmap_user bio_uncopy_user __bio_copy_iov copy_to_user The sg driver calls sg_remove_scat to free the memory pages before calling blk_rq_unmap_user that tries to copy the data back to userspace. Change the order to first call blk_rq_unmap_user before freeing the pages in sg_remove_scat. Acked-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: stable@kernel.org Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com> Acked-by: Douglas Gilbert <dgilbert@interlog.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-10-01const: constify remaining file_operationsAlexey Dobriyan
[akpm@linux-foundation.org: fix KVM] Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Acked-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-09-27const: mark struct vm_struct_operationsAlexey Dobriyan
* mark struct vm_area_struct::vm_ops as const * mark vm_ops in AGP code But leave TTM code alone, something is fishy there with global vm_ops being used. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-09-23seq_file: constify seq_operationsJames Morris
Make all seq_operations structs const, to help mitigate against revectoring user-triggerable function pointers. This is derived from the grsecurity patch, although generated from scratch because it's simpler than extracting the changes from there. Signed-off-by: James Morris <jmorris@namei.org> Acked-by: Serge Hallyn <serue@us.ibm.com> Acked-by: Casey Schaufler <casey@schaufler-ca.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-09-12[SCSI] sg: fix oops in the error path in sg_build_indirect()Michal Schmidt
When the allocation fails in sg_build_indirect(), an oops happens in the error path. It's caused by an obvious typo. Signed-off-by: Michal Schmidt <mschmidt@redhat.com> Reported-by: Bob Tracy <rct@gherkin.frus.com> Acked-by: Douglas Gilbert <dgilbert@interlog.com> Cc: Stable Tree <stable@kernel.org> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-07-10block: fix sg SG_DXFER_TO_FROM_DEV regressionFUJITA Tomonori
I overlooked SG_DXFER_TO_FROM_DEV support when I converted sg to use the block layer mapping API (2.6.28). Douglas Gilbert explained SG_DXFER_TO_FROM_DEV: http://www.spinics.net/lists/linux-scsi/msg37135.html = The semantics of SG_DXFER_TO_FROM_DEV were: - copy user space buffer to kernel (LLD) buffer - do SCSI command which is assumed to be of the DATA_IN (data from device) variety. This would overwrite some or all of the kernel buffer - copy kernel (LLD) buffer back to the user space. The idea was to detect short reads by filling the original user space buffer with some marker bytes ("0xec" it would seem in this report). The "resid" value is a better way of detecting short reads but that was only added this century and requires co-operation from the LLD. = This patch changes the block layer mapping API to support this semantics. This simply adds another field to struct rq_map_data and enables __bio_copy_iov() to copy data from user space even with READ requests. It's better to add the flags field and kills null_mapped and the new from_user fields in struct rq_map_data but that approach makes it difficult to send this patch to stable trees because st and osst drivers use struct rq_map_data (they were converted to use the block layer in 2.6.29 and 2.6.30). Well, I should clean up the block layer mapping API. zhou sf reported this regiression and tested this patch: http://www.spinics.net/lists/linux-scsi/msg37128.html http://www.spinics.net/lists/linux-scsi/msg37168.html Reported-by: zhou sf <sxzzsf@gmail.com> Tested-by: zhou sf <sxzzsf@gmail.com> Cc: stable@kernel.org Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2009-07-08Remove multiple KERN_ prefixes from printk formatsJoe Perches
Commit 5fd29d6ccbc98884569d6f3105aeca70858b3e0f ("printk: clean up handling of log-levels and newlines") changed printk semantics. printk lines with multiple KERN_<level> prefixes are no longer emitted as before the patch. <level> is now included in the output on each additional use. Remove all uses of multiple KERN_<level>s in formats. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-07-01block: get rid of queue-private command filterJens Axboe
The initial patches to support this through sysfs export were broken and have been if 0'ed out in any release. So lets just kill the code and reclaim some space in struct request_queue, if anyone would later like to fixup the sysfs bits, the git history can easily restore the removed bits. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2009-06-11Merge branch 'for-2.6.31' of git://git.kernel.dk/linux-2.6-blockLinus Torvalds
* 'for-2.6.31' of git://git.kernel.dk/linux-2.6-block: (153 commits) block: add request clone interface (v2) floppy: fix hibernation ramdisk: remove long-deprecated "ramdisk=" boot-time parameter fs/bio.c: add missing __user annotation block: prevent possible io_context->refcount overflow Add serial number support for virtio_blk, V4a block: Add missing bounce_pfn stacking and fix comments Revert "block: Fix bounce limit setting in DM" cciss: decode unit attention in SCSI error handling code cciss: Remove no longer needed sendcmd reject processing code cciss: change SCSI error handling routines to work with interrupts enabled. cciss: separate error processing and command retrying code in sendcmd_withirq_core() cciss: factor out fix target status processing code from sendcmd functions cciss: simplify interface of sendcmd() and sendcmd_withirq() cciss: factor out core of sendcmd_withirq() for use by SCSI error handling code cciss: Use schedule_timeout_uninterruptible in SCSI error handling code block: needs to set the residual length of a bidi request Revert "block: implement blkdev_readpages" block: Fix bounce limit setting in DM Removed reference to non-existing file Documentation/PCI/PCI-DMA-mapping.txt ... Manually fix conflicts with tracing updates in: block/blk-sysfs.c drivers/ide/ide-atapi.c drivers/ide/ide-cd.c drivers/ide/ide-floppy.c drivers/ide/ide-tape.c include/trace/events/block.h kernel/trace/blktrace.c
2009-05-22block: Use accessor functions for queue limitsMartin K. Petersen
Convert all external users of queue limits to using wrapper functions instead of poking the request queue variables directly. Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2009-05-22Merge branch 'master' into for-2.6.31Jens Axboe
Conflicts: drivers/block/hd.c drivers/block/mg_disk.c Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2009-05-11block: add rq->resid_lenTejun Heo
rq->data_len served two purposes - the length of data buffer on issue and the residual count on completion. This duality creates some headaches. First of all, block layer and low level drivers can't really determine what rq->data_len contains while a request is executing. It could be the total request length or it coulde be anything else one of the lower layers is using to keep track of residual count. This complicates things because blk_rq_bytes() and thus [__]blk_end_request_all() relies on rq->data_len for PC commands. Drivers which want to report residual count should first cache the total request length, update rq->data_len and then complete the request with the cached data length. Secondly, it makes requests default to reporting full residual count, ie. reporting that no data transfer occurred. The residual count is an exception not the norm; however, the driver should clear rq->data_len to zero to signify the normal cases while leaving it alone means no data transfer occurred at all. This reverse default behavior complicates code unnecessarily and renders block PC on some drivers (ide-tape/floppy) unuseable. This patch adds rq->resid_len which is used only for residual count. While at it, remove now unnecessasry blk_rq_bytes() caching in ide_pc_intr() as rq->data_len is not changed anymore. Boaz : spotted missing conversion in osd Sergei : spotted too early conversion to blk_rq_bytes() in ide-tape [ Impact: cleanup residual count handling, report 0 resid by default ] Signed-off-by: Tejun Heo <tj@kernel.org> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Cc: Borislav Petkov <petkovbb@googlemail.com> Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com> Cc: Mike Miller <mike.miller@hp.com> Cc: Eric Moore <Eric.Moore@lsi.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: Doug Gilbert <dgilbert@interlog.com> Cc: Mike Miller <mike.miller@hp.com> Cc: Eric Moore <Eric.Moore@lsi.com> Cc: Darrick J. Wong <djwong@us.ibm.com> Cc: Pete Zaitcev <zaitcev@redhat.com> Cc: Boaz Harrosh <bharrosh@panasas.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2009-05-07Merge branch 'linus' into tracing/coreIngo Molnar
Merge reason: tracing/core was on a .30-rc1 base and was missing out on on a handful of tracing fixes present in .30-rc5-almost. Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-04-27[SCSI] sg: return EFAULT for an invalid user addressFUJITA Tomonori
blk_rq_unmap_user() returns EFAULT if a program passes an invalid address to kernel (the kernel fails to copy data to user space). sg needs to pass the returned value to user space instead of ignoring it. Before the block layer conversion, sg returns EFAULT properly. This restores the old behavior. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Acked-by: Douglas Gilbert <dgilbert@interlog.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2009-04-16blktrace: support per-partition tracingShawn Du
Though one can specify '-d /dev/sda1' when using blktrace, it still traces the whole sda. To support per-partition tracing, when we start tracing, we initialize bt->start_lba and bt->end_lba to the start and end sector of that partition. Note some actions are per device, thus we don't filter 0-sector events. The original patch and discussion can be found here: http://marc.info/?l=linux-btrace&m=122949374214540&w=2 Signed-off-by: Shawn Du <duyuyang@gmail.com> Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Acked-by: "Theodore Ts'o" <tytso@mit.edu> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jens Axboe <jens.axboe@oracle.com> LKML-Reference: <49E42620.4050701@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-04-03[SCSI] sg: fix q->queue_lock on scsi_error_handler pathFUJITA Tomonori
sg_rq_end_io() is called via rq->end_io. In some rare cases, sg_rq_end_io calls blk_put_request/blk_rq_unmap_user (when a program issuing a command has gone before the command completion; e.g. by interrupting a program issuing a command before the command completes). We can't call blk_put_request/blk_rq_unmap_user in interrupt so the commit c96952ed7031e7c576ecf90cf95b8ec099d5295a uses execute_in_process_context(). The problem is that scsi_error_handler() calls rq->end_io too. We can't call blk_put_request/blk_rq_unmap_user too in this path (we hold q->queue_lock). To avoid the above problem, in these rare cases, this patch always uses schedule_work() instead of execute_in_process_context(). Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Acked-by: Douglas Gilbert <dgilbert@interlog.com> Cc: Stable Tree <stable@kernel.org> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2009-04-03[SCSI] sg: fix iovec bugs introduced by the block layer conversionFUJITA Tomonori
- needs to use copy_from_user for iovec before passing it to blk_rq_map_user_iov(). - before the block layer conversion, if ->dxfer_len and sum of iovec disagrees, the shorter one wins. However, currently sg returns -EINVAL. This restores the old behavior. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Acked-by: Douglas Gilbert <dgilbert@interlog.com> Cc: stable@kernel.org Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2009-03-28Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6Linus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6: (119 commits) [SCSI] scsi_dh_rdac: Retry for NOT_READY check condition [SCSI] mpt2sas: make global symbols unique [SCSI] sd: Make revalidate less chatty [SCSI] sd: Try READ CAPACITY 16 first for SBC-2 devices [SCSI] sd: Refactor sd_read_capacity() [SCSI] mpt2sas v00.100.11.15 [SCSI] mpt2sas: add MPT2SAS_MINOR(221) to miscdevice.h [SCSI] ch: Add scsi type modalias [SCSI] 3w-9xxx: add power management support [SCSI] bsg: add linux/types.h include to bsg.h [SCSI] cxgb3i: fix function descriptions [SCSI] libiscsi: fix possbile null ptr session command cleanup [SCSI] iscsi class: remove host no argument from session creation callout [SCSI] libiscsi: pass session failure a session struct [SCSI] iscsi lib: remove qdepth param from iscsi host allocation [SCSI] iscsi lib: have lib create work queue for transmitting IO [SCSI] iscsi class: fix lock dep warning on logout [SCSI] libiscsi: don't cap queue depth in iscsi modules [SCSI] iscsi_tcp: replace scsi_debug/tcp_debug logging with iscsi conn logging [SCSI] libiscsi_tcp: replace tcp_debug/scsi_debug logging with session/conn logging ...
2009-03-16Rationalize fasync return valuesJonathan Corbet
Most fasync implementations do something like: return fasync_helper(...); But fasync_helper() will return a positive value at times - a feature used in at least one place. Thus, a number of other drivers do: err = fasync_helper(...); if (err < 0) return err; return 0; In the interests of consistency and more concise code, it makes sense to map positive return values onto zero where ->fasync() is called. Cc: Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2009-03-12[SCSI] sg: remove the own list management for struct sg_fdFUJITA Tomonori
This replaces the own list management for struct sg_fd with the standard list_head structure. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Acked-by: Douglas Gilbert <dgilbert@interlog.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2009-03-12[SCSI] sg: use ALIGN macroFUJITA Tomonori
This changes sg_build_indirect() to use ALIGN macro instead of calculating by hand. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Acked-by: Douglas Gilbert <dgilbert@interlog.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2009-03-12[SCSI] sg: remove unnecessary function declarationsFUJITA Tomonori
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Acked-by: Douglas Gilbert <dgilbert@interlog.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2009-03-12[SCSI] sg: avoid blk_put_request/blk_rq_unmap_user in interruptFUJITA Tomonori
This fixes the following oops: http://marc.info/?l=linux-kernel&m=123316111415677&w=2 You can reproduce this bug by interrupting a program before a sg response completes. This leads to the special sg state (the orphan state), then sg calls blk_put_request in interrupt (rq->end_io). The above bug report shows the recursive lock problem because sg calls blk_put_request in interrupt. We could call __blk_put_request here instead however we also need to handle blk_rq_unmap_user here, which can't be called in interrupt too. In the orphan state, we don't need to care about the data transfer (the program revoked the command) so adding 'just free the resource' mode to blk_rq_unmap_user is a possible option. I prefer to avoid complicating the blk mapping API when possible. I change the orphan state to call sg_finish_rem_req via execute_in_process_context. We hold sg_fd->kref so sg_fd doesn't go away until keventd_wq finishes our work. copy_from_user/to_user fails so blk_rq_unmap_user just frees the resource without the data transfer. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Acked-by: Douglas Gilbert <dgilbert@interlog.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2009-03-12[SCSI] sg: fix races with ioctl(SG_IO)Tony Battersby
sg_io_owned needs to be set before the command is sent to the midlevel; otherwise, a quickly-completing command may cause a different CPU to see "srp->done == 1 && !srp->sg_io_owned", which would lead to incorrect behavior. Check srp->done and set srp->orphan while holding rq_list_lock to prevent races with sg_rq_end_io(). There is no need to check sfp->closed from read/write/ioctl/poll/etc. since the kernel guarantees that this won't happen. The usefulness of sg_srp_done() was questionable before; now it is definitely not needed. Signed-off-by: Tony Battersby <tonyb@cybernetics.com> Acked-by: Douglas Gilbert <dgilbert@interlog.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2009-03-12[SCSI] sg: fix races during device removalTony Battersby
sg has the following problems related to device removal: * opening a sg fd races with removing a device * closing a sg fd races with removing a device * /proc/scsi/sg/* access races with removing a device * command completion races with removing a device * command completion races with closing a sg fd * can rmmod sg with active commands These problems can cause kernel oopses, memory-use-after-free, or double-free errors. This patch fixes these problems by using krefs to manage the lifetime of sg_device and sg_fd. Each command submitted to the midlevel holds a reference to sg_fd until the completion callback. This ensures that sg_fd doesn't go away if the fd is closed with commands still outstanding. sg_fd gets the reference of sg_device (with scsi_device) and also makes sure that the sg module doesn't go away. /proc/scsi/sg/* functions don't play nicely with krefs because they give information about sg_fds which have been closed but not yet freed due to still having outstanding commands and sg_devices which have been removed but not yet freed due to still being referenced by one or more sg_fds. To deal with this safely without removing functionality, /proc functions now access sg_device and sg_fd while holding a lock instead of using kref_get()/kref_put(). Signed-off-by: Tony Battersby <tonyb@cybernetics.com> Acked-by: Douglas Gilbert <dgilbert@interlog.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2009-02-10[SCSI] sg: fix device number in blktrace dataMartin Peschke
Hi, we have run into an issue with blktrace being started for sg devices. Please apply. Thanks, Martin From: Martin Peschke <mpeschke@linux.vnet.ibm.com> The device number denoting a generic SCSI devices (sg) in a blktrace trace is broken; major and minor are always 0. It looks like sdp->device->sdev_gendev.devt is not initialized properly. The fix below uses other data to make up a valid device number, similar to the way an sg device number is generated for sysfs output. Reported-by: Stefan Raspl <raspl@linux.vnet.ibm.com> Signed-off-by: Martin Peschke <mpeschke@linux.vnet.ibm.com> Acked-by: Douglas Gilbert <dgilbert@interlog.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2009-01-02[SCSI] block: make blk_rq_map_user take a NULL user-space buffer for WRITEFUJITA Tomonori
The commit 818827669d85b84241696ffef2de485db46b0b5e (block: make blk_rq_map_user take a NULL user-space buffer) extended blk_rq_map_user to accept a NULL user-space buffer with a READ command. It was necessary to convert sg to use the block layer mapping API. This patch extends blk_rq_map_user again for a WRITE command. It is necessary to convert st and osst drivers to use the block layer apping API. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Acked-by: Jens Axboe <jens.axboe@oracle.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2009-01-02[SCSI] block: fix the partial mappings with struct rq_map_dataFUJITA Tomonori
This fixes bio_copy_user_iov to properly handle the partial mappings with struct rq_map_data (which only sg uses for now but st and osst will shortly). It adds the offset member to struct rq_map_data and changes blk_rq_map_user to update it so that bio_copy_user_iov can add an appropriate page frame via bio_add_pc_page(). Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Acked-by: Jens Axboe <jens.axboe@oracle.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2008-11-01saner FASYNC handling on file closeAl Viro
As it is, all instances of ->release() for files that have ->fasync() need to remember to evict file from fasync lists; forgetting that creates a hole and we actually have a bunch that *does* forget. So let's keep our lives simple - let __fput() check FASYNC in file->f_flags and call ->fasync() there if it's been set. And lose that crap in ->release() instances - leaving it there is still valid, but we don't have to bother anymore. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-10-21[PATCH] switch sg_scsi_ioctl() to passing fmode_tAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2008-10-16device create: scsi: convert device_create_drvdata to device_createGreg Kroah-Hartman
Now that device_create() has been audited, rename things back to the original call to be sane. Cc: James E.J. Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2008-10-09sg: remove unnecessary blk_rq_unmap_userFUJITA Tomonori
blk_rq_unmap_user in sg_finish_rem_req can take care of all the cases. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2008-10-09sg: remove sg_read_xferFUJITA Tomonori
sg_read_xfer was used to copy data to user space for READ commands. blk_rq_unmap_user does the job so sg_read_xfer does nothing useful. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2008-10-09sg: remove sg_write_xferFUJITA Tomonori
sg_write_xfer was used to copy data from user space for WRITE commands. blk_rq_map_user_iov and blk_rq_map_user do the job so sg_write_xfer does nothing useful. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2008-10-09sg: incorporate sg_build_direct into sg_start_reqFUJITA Tomonori
Calling blk_rq_map_user() at a single place is better than at different two places. It makes the code more understandable. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2008-10-09sg: remove __sg_start_reqFUJITA Tomonori
__sg_start_req() was used temporarily to call blk_get_request() during converting sg to use the block layer. Now sg always calls blk_get_request() so we can move blk_get_request() to sg_start_req(). We don't need __sg_start_req anymore. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2008-10-09sg: remove b_malloc_len in sg_scatter_hold structFUJITA Tomonori
It's not used for anything useful after the block layer conversion. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2008-10-09sg: remove SG_ALLOW_DIO_CODE defineFUJITA Tomonori
sg had lots of the own functions for the direct IO but now sg uses the block layer functions for it. There are only five lines for the direct IO. SG_ALLOW_DIO_CODE define was used to compile out the direct IO code but we don't need the define. If someone wants to remove the direct IO code, he can do easily without the define. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2008-10-09sg: rename sg_cmd_done sg_rq_end_ioFUJITA Tomonori
old sg_rq_end_io() was used to wrap sg_cmd_done during converting sg to use the block layer (in order to cover the difference scsi_execute_async and blk_execute_rq_nowait). Now we don't need it so let's remove it. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2008-10-09sg: set dxferp to NULL for READ with the older SG interfaceFUJITA Tomonori
With the older SG interface, we don't know a user-space address to trasfer data when executing a SCSI command. So we can't pass a user-space address to blk_rq_map_user. This patch fixes sg to pass a NULL user-space address to blk_rq_map_user so that it just sets up a request and bios with page frames propely without data transfer. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2008-10-09sg: use blk_rq_aligned helper functionFUJITA Tomonori
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: Douglas Gilbert <dougg@torque.net> Cc: Jens Axboe <jens.axboe@oracle.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2008-10-09sg: convert the indirect IO path to use the block layerFUJITA Tomonori
This patch converts the indirect IO path (including mmap IO and old struct sg_header) to use the block layer functions (blk_get_request, blk_execute_rq_nowait, blk_rq_map_user, etc) instead of scsi_execute_async(). [Jens: fixed compile error with SCSI logging enabled] Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Douglas Gilbert <dougg@torque.net> Cc: Mike Christie <michaelc@cs.wisc.edu> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2008-10-09sg: convert the direct IO path to use the block layerFUJITA Tomonori
This patch converts the direct IO path (SG_FLAG_DIRECT_IO) to use the block layer functions (blk_get_request, blk_execute_rq_nowait, blk_rq_map_user, etc) instead of scsi_execute_async(). Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Douglas Gilbert <dougg@torque.net> Cc: Mike Christie <michaelc@cs.wisc.edu> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>