#
eb6e199b |
| 07-Dec-2009 |
Stefan Weinhuber <wein@de.ibm.com> |
[S390] dasd: improve error recovery for internal I/O
Most of the error conditions reported by a FICON storage server indicate situations which can be recovered. Sometimes the host just needs to retr
[S390] dasd: improve error recovery for internal I/O
Most of the error conditions reported by a FICON storage server indicate situations which can be recovered. Sometimes the host just needs to retry an I/O request, but sometimes the recovery is more complex and requires the device driver to wait, choose a different path, etc.
The DASD device driver has a fully featured error recovery for normal block layer I/O, but not for internal I/O request which are for example used during the device bring up. This can lead to situations where the IPL of a system fails because DASD devices are not properly recognized. This patch will extend the internal I/O handling to use the existing error recovery procedures.
Signed-off-by: Stefan Weinhuber <wein@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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#
779c2782 |
| 07-Dec-2009 |
Christian Borntraeger <borntraeger@de.ibm.com> |
[S390] dasd: remove dead code
the todclk.h header file is dead code. Remove it.
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.c
[S390] dasd: remove dead code
the todclk.h header file is dead code. Remove it.
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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|
#
454e1fa1 |
| 07-Dec-2009 |
Peter Oberparleiter <peter.oberparleiter@de.ibm.com> |
[S390] cio: split PGID settings and status
Split setting (driver wants feature enabled) and status (feature setup was successful) for PGID related ccw device features so that setup errors can be det
[S390] cio: split PGID settings and status
Split setting (driver wants feature enabled) and status (feature setup was successful) for PGID related ccw device features so that setup errors can be detected. Previously, incorrectly handled setup errors could in rare cases lead to erratic I/O behavior and permanently unusuable devices.
Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Revision tags: v2.6.32, v2.6.32-rc8, v2.6.32-rc7, v2.6.32-rc6, v2.6.32-rc5 |
|
#
d9fa9441 |
| 14-Oct-2009 |
Stefan Haberland <stefan.haberland@de.ibm.com> |
[S390] dasd: use idal for device characteristics
If the rdc_buffer is above 2G we need indirect addresssing so we have to use an idaw to give the rdc_buffer to the ccw. If the rdc_buffer is under 2G
[S390] dasd: use idal for device characteristics
If the rdc_buffer is above 2G we need indirect addresssing so we have to use an idaw to give the rdc_buffer to the ccw. If the rdc_buffer is under 2G nothing changes.
Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Revision tags: v2.6.32-rc4 |
|
#
6fca97a9 |
| 06-Oct-2009 |
Stefan Haberland <stefan.haberland@de.ibm.com> |
[S390] dasd: fix race condition in resume code
There is a race while re-reading the device characteristics. After cleaning the memory area a cqr is build which reads the device characteristics. This
[S390] dasd: fix race condition in resume code
There is a race while re-reading the device characteristics. After cleaning the memory area a cqr is build which reads the device characteristics. This may take a rather long time and the device characteristics structure is zero during this. Now it could be possible that the block tasklet starts working and a new cqr will be build. The build_cp command refers to the device characteristics structure and this may lead into a divide by zero exception. Fix this by re-reading the device characteristics into a temporary structur and copy the data to the original structure. Also take the ccwdev_lock.
Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Revision tags: v2.6.32-rc3, v2.6.32-rc1, v2.6.32-rc2 |
|
#
83d5cde4 |
| 21-Sep-2009 |
Alexey Dobriyan <adobriyan@gmail.com> |
const: make block_device_operations const
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-
const: make block_device_operations const
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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#
68b781fe |
| 11-Sep-2009 |
Stefan Haberland <stefan.haberland@de.ibm.com> |
[S390] dasd: optimize cpu usage in goodcase
remove unnecessary dbf call, remove string operations for magic
Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by: Martin Schwi
[S390] dasd: optimize cpu usage in goodcase
remove unnecessary dbf call, remove string operations for magic
Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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#
97f604b0 |
| 11-Sep-2009 |
Stefan Weinhuber <wein@de.ibm.com> |
[S390] dasd: fail requests when device state is less then ready
A DASD device that is not ready or online has no defined disk layout, so all requests that arrive in such a state need to be returned
[S390] dasd: fail requests when device state is less then ready
A DASD device that is not ready or online has no defined disk layout, so all requests that arrive in such a state need to be returned as failed.
Signed-off-by: Stefan Weinhuber <wein@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Revision tags: v2.6.31, v2.6.31-rc9, v2.6.31-rc8 |
|
#
cf05b824 |
| 23-Aug-2009 |
Julia Lawall <julia@diku.dk> |
[S390] drivers/s390: put NULL test before dereference
If the NULL test on block is needed, it should be before the dereference of the base field.
The semantic match that finds this problem is as fo
[S390] drivers/s390: put NULL test before dereference
If the NULL test on block is needed, it should be before the dereference of the base field.
The semantic match that finds this problem is as follows: (http://coccinelle.lip6.fr/)
// <smpl> @r@ expression E1,E2; identifier fld; statement S1,S2; @@
E1 = E2->fld; ( if (E1 == NULL) S1 else S2 | *if (E2 == NULL) S1 else S2 ) // </smpl>
Signed-off-by: Julia Lawall <julia@diku.dk> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Revision tags: v2.6.31-rc7, v2.6.31-rc6, v2.6.31-rc5, v2.6.31-rc4, v2.6.31-rc3, v2.6.31-rc2, v2.6.31-rc1 |
|
#
181d9522 |
| 22-Jun-2009 |
Sebastian Ott <sebott@linux.vnet.ibm.com> |
[S390] dasd: fix refcounting in dasd_change_state
To set a dasd online dasd_change_state is called twice. The first cycle will schedule initial analysis of the device, set the rc to -EAGAIN and will
[S390] dasd: fix refcounting in dasd_change_state
To set a dasd online dasd_change_state is called twice. The first cycle will schedule initial analysis of the device, set the rc to -EAGAIN and will not touch the device state any more. The initial analysis will in turn call dasd_change_state to increase the state to the final DASD_STATE_ONLINE.
If the dasd_change_state on the second thread outruns the other one both finish with the state set to DASD_STATE_ONLINE and the device refcount will be decreased by 2.
Fix this by leaving dasd_change_state on rc == -EAGAIN so that the refcount will always be decreased by 1.
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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#
e6125fba |
| 22-Jun-2009 |
Stefan Haberland <stefan.haberland@de.ibm.com> |
[S390] dasd_pm: fix stop flag handling
The stop flags are handled in the generic restore function so the stop flag is removed also for FBA and DIAG devices.
Signed-off-by: Stefan Haberland <stefan.
[S390] dasd_pm: fix stop flag handling
The stop flags are handled in the generic restore function so the stop flag is removed also for FBA and DIAG devices.
Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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#
d41dd122 |
| 16-Jun-2009 |
Stefan Haberland <stefan.haberland@de.ibm.com> |
[S390] pm: dasd power management callbacks.
Introduce the power management callbacks to the dasd driver. On suspend the dasd devices are stopped and removed from the focus of alias management. On re
[S390] pm: dasd power management callbacks.
Introduce the power management callbacks to the dasd driver. On suspend the dasd devices are stopped and removed from the focus of alias management. On resume they are reinitialized by rereading the device characteristics and adding the device to the alias management. In case the device has gone away during suspend it will caught in the suspend state with stopped flag set to UNRESUMED. After it appears again the restore function is called again.
Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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#
6cc7f168 |
| 12-Jun-2009 |
Stefan Weinhuber <wein@de.ibm.com> |
[S390] dasd: forward internal errors to dasd_sleep_on caller
If a DASD requests is started with dasd_sleep_on and fails, then the calling function may need to know the reason for the failure. In cas
[S390] dasd: forward internal errors to dasd_sleep_on caller
If a DASD requests is started with dasd_sleep_on and fails, then the calling function may need to know the reason for the failure. In cases of hardware errors it can inspect the sense data in the irb, but when the reason is internal (e.g. start_IO failed) then it needs a meaningfull return code.
Signed-off-by: Stefan Weinhuber <wein@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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#
92636b15 |
| 12-Jun-2009 |
Sebastian Ott <sebott@linux.vnet.ibm.com> |
[S390] dasd: check_characteristics cleanup
Fix a broken memset (sizeof pointer vs sizeof the underlying structure) by cleaning up the involved functions.
Signed-off-by: Sebastian Ott <sebott@linux.
[S390] dasd: check_characteristics cleanup
Fix a broken memset (sizeof pointer vs sizeof the underlying structure) by cleaning up the involved functions.
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Revision tags: v2.6.30, v2.6.30-rc8, v2.6.30-rc7 |
|
#
e1defc4f |
| 22-May-2009 |
Martin K. Petersen <martin.petersen@oracle.com> |
block: Do away with the notion of hardsect_size
Until now we have had a 1:1 mapping between storage device physical block size and the logical block sized used when addressing the device. With SATA
block: Do away with the notion of hardsect_size
Until now we have had a 1:1 mapping between storage device physical block size and the logical block sized used when addressing the device. With SATA 4KB drives coming out that will no longer be the case. The sector size will be 4KB but the logical block size will remain 512-bytes. Hence we need to distinguish between the physical block size and the logical ditto.
This patch renames hardsect_size to logical_block_size.
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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Revision tags: v2.6.30-rc6, v2.6.30-rc5 |
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#
9934c8c0 |
| 07-May-2009 |
Tejun Heo <tj@kernel.org> |
block: implement and enforce request peek/start/fetch
Till now block layer allowed two separate modes of request execution. A request is always acquired from the request queue via elv_next_request()
block: implement and enforce request peek/start/fetch
Till now block layer allowed two separate modes of request execution. A request is always acquired from the request queue via elv_next_request(). After that, drivers are free to either dequeue it or process it without dequeueing. Dequeue allows elv_next_request() to return the next request so that multiple requests can be in flight.
Executing requests without dequeueing has its merits mostly in allowing drivers for simpler devices which can't do sg to deal with segments only without considering request boundary. However, the benefit this brings is dubious and declining while the cost of the API ambiguity is increasing. Segment based drivers are usually for very old or limited devices and as converting to dequeueing model isn't difficult, it doesn't justify the API overhead it puts on block layer and its more modern users.
Previous patches converted all block low level drivers to dequeueing model. This patch completes the API transition by...
* renaming elv_next_request() to blk_peek_request()
* renaming blkdev_dequeue_request() to blk_start_request()
* adding blk_fetch_request() which is combination of peek and start
* disallowing completion of queued (not started) requests
* applying new API to all LLDs
Renamings are for consistency and to break out of tree code so that it's apparent that out of tree drivers need updating.
[ Impact: block request issue API cleanup, no functional change ]
Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Cc: Mike Miller <mike.miller@hp.com> Cc: unsik Kim <donari75@gmail.com> Cc: Paul Clements <paul.clements@steeleye.com> Cc: Tim Waugh <tim@cyberelk.net> Cc: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com> Cc: David S. Miller <davem@davemloft.net> Cc: Laurent Vivier <Laurent@lvivier.info> Cc: Jeff Garzik <jgarzik@pobox.com> Cc: Jeremy Fitzhardinge <jeremy@xensource.com> Cc: Grant Likely <grant.likely@secretlab.ca> Cc: Adrian McMenamin <adrian@mcmen.demon.co.uk> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Cc: Borislav Petkov <petkovbb@googlemail.com> Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com> Cc: Alex Dubov <oakad@yahoo.com> Cc: Pierre Ossman <drzeus@drzeus.cx> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Markus Lidel <Markus.Lidel@shadowconnect.com> Cc: Stefan Weinhuber <wein@de.ibm.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Pete Zaitcev <zaitcev@redhat.com> Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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#
83096ebf |
| 07-May-2009 |
Tejun Heo <tj@kernel.org> |
block: convert to pos and nr_sectors accessors
With recent cleanups, there is no place where low level driver directly manipulates request fields. This means that the 'hard' request fields always e
block: convert to pos and nr_sectors accessors
With recent cleanups, there is no place where low level driver directly manipulates request fields. This means that the 'hard' request fields always equal the !hard fields. Convert all rq->sectors, nr_sectors and current_nr_sectors references to accessors.
While at it, drop superflous blk_rq_pos() < 0 test in swim.c.
[ Impact: use pos and nr_sectors accessors ]
Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com> Tested-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: Grant Likely <grant.likely@secretlab.ca> Tested-by: Adrian McMenamin <adrian@mcmen.demon.co.uk> Acked-by: Adrian McMenamin <adrian@mcmen.demon.co.uk> Acked-by: Mike Miller <mike.miller@hp.com> 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: Eric Moore <Eric.Moore@lsi.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: Pete Zaitcev <zaitcev@redhat.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Paul Clements <paul.clements@steeleye.com> Cc: Tim Waugh <tim@cyberelk.net> Cc: Jeff Garzik <jgarzik@pobox.com> Cc: Jeremy Fitzhardinge <jeremy@xensource.com> Cc: Alex Dubov <oakad@yahoo.com> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Dario Ballabio <ballabio_dario@emc.com> Cc: David S. Miller <davem@davemloft.net> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: unsik Kim <donari75@gmail.com> Cc: Laurent Vivier <Laurent@lvivier.info> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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Revision tags: v2.6.30-rc4 |
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#
40cbbb78 |
| 22-Apr-2009 |
Tejun Heo <tj@kernel.org> |
block: implement and use [__]blk_end_request_all()
There are many [__]blk_end_request() call sites which call it with full request length and expect full completion. Many of them ensure that the re
block: implement and use [__]blk_end_request_all()
There are many [__]blk_end_request() call sites which call it with full request length and expect full completion. Many of them ensure that the request actually completes by doing BUG_ON() the return value, which is awkward and error-prone.
This patch adds [__]blk_end_request_all() which takes @rq and @error and fully completes the request. BUG_ON() is added to to ensure that this actually happens.
Most conversions are simple but there are a few noteworthy ones.
* cdrom/viocd: viocd_end_request() replaced with direct calls to __blk_end_request_all().
* s390/block/dasd: dasd_end_request() replaced with direct calls to __blk_end_request_all().
* s390/char/tape_block: tapeblock_end_request() replaced with direct calls to blk_end_request_all().
[ Impact: cleanup ]
Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Mike Miller <mike.miller@hp.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Jeff Garzik <jgarzik@pobox.com> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Jeremy Fitzhardinge <jeremy@xensource.com> Cc: Alex Dubov <oakad@yahoo.com> Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
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Revision tags: v2.6.30-rc3, v2.6.30-rc2 |
|
#
f3445a1a |
| 14-Apr-2009 |
Cornelia Huck <cornelia.huck@de.ibm.com> |
[S390] dasd: Use the new async framework for autoonlining.
The dasd driver can automatically online detected dasds, which especially important for finding the root device. Currently, it will wait fo
[S390] dasd: Use the new async framework for autoonlining.
The dasd driver can automatically online detected dasds, which especially important for finding the root device. Currently, it will wait for each online operation to finish individually, which may take long if many dasds need to be onlined. When using the new async framework, these onlining operations can run in parallel and presence of the root device is ensured by the fact that prepare_namespace() waits for all async threads to finish.
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Revision tags: v2.6.30-rc1 |
|
#
47593bfa |
| 31-Mar-2009 |
Sebastian Ott <sebott@linux.vnet.ibm.com> |
[S390] cio: introduce notifier for boxed state
If a ccw device did not respond in time during internal io, we set it into boxed state. With this patch we have the following behaviour: * the ccw dri
[S390] cio: introduce notifier for boxed state
If a ccw device did not respond in time during internal io, we set it into boxed state. With this patch we have the following behaviour: * the ccw driver will get a notification if the device was online and goes into the boxed state * if the device was disconnected and got boxed nothing special is to be done (it will be handled in reprobing later) * if the device got boxed while initial sensing it will be unregistered
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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#
fc19f381 |
| 26-Mar-2009 |
Stefan Haberland <stefan.haberland@de.ibm.com> |
[S390] dasd: message cleanup
Moved some Messages into s390 debug feature and changed remaining messages to use the dev_xxx and pr_xxx macros.
Signed-off-by: Stefan Haberland <stefan.haberland@de.ib
[S390] dasd: message cleanup
Moved some Messages into s390 debug feature and changed remaining messages to use the dev_xxx and pr_xxx macros.
Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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#
f3eb5384 |
| 26-Mar-2009 |
Stefan Weinhuber <wein@de.ibm.com> |
[S390] dasd: add High Performance FICON support
To support High Performance FICON, the DASD device driver has to translate I/O requests into the new transport mode control words (TCW) instead of the
[S390] dasd: add High Performance FICON support
To support High Performance FICON, the DASD device driver has to translate I/O requests into the new transport mode control words (TCW) instead of the traditional (command mode) CCW requests.
Signed-off-by: Stefan Weinhuber <wein@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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#
0000d031 |
| 26-Mar-2009 |
Heiko Carstens <heiko.carstens@de.ibm.com> |
[S390] dasd: enable compat ioctls
All of the ioctls are compatible. Just enable them.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm
[S390] dasd: enable compat ioctls
All of the ioctls are compatible. Just enable them.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Revision tags: v2.6.29, v2.6.29-rc8, v2.6.29-rc7, v2.6.29-rc6, v2.6.29-rc5 |
|
#
48cae885 |
| 11-Feb-2009 |
Stefan Weinhuber <wein@de.ibm.com> |
[S390] dasd: fix race in dasd timer handling
In dasd_device_set_timer and dasd_block_set_timer we interpret the return value of mod_timer in a wrong way. If the timer expires in the small window bet
[S390] dasd: fix race in dasd timer handling
In dasd_device_set_timer and dasd_block_set_timer we interpret the return value of mod_timer in a wrong way. If the timer expires in the small window between our check of timer_pending and the call to mod_timer, then the timer will be set, mod_timer returns zero and we will call add_timer for a timer that is already pending. As del_timer and mod_timer do all the necessary checking themselves, we can simplify our code and remove the race a the same time.
Signed-off-by: Stefan Weinhuber <wein@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Revision tags: v2.6.29-rc4, v2.6.29-rc3, v2.6.29-rc2, v2.6.29-rc1 |
|
#
1301809b |
| 09-Jan-2009 |
Stefan Weinhuber <wein@de.ibm.com> |
[S390] dasd: send change uevents for dasd block devices
When a DASD device enters or leaves the 'online' state we need to trigger change events for the respective disk and partitions. These extra ev
[S390] dasd: send change uevents for dasd block devices
When a DASD device enters or leaves the 'online' state we need to trigger change events for the respective disk and partitions. These extra events are needed because when disk and partitions are first added, udev rules that try to read disk labels or other data may fail as the disk may not yet be ready.
Signed-off-by: Stefan Weinhuber <wein@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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