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* Enhanced partition statistics: core statisticsJerome Marchand2008-02-08
| | | | | | | | | This patch contain the core infrastructure of enhanced partition statistics. It adds to struct hd_struct the same stats data as struct gendisk and define basics function to manipulate them. Signed-off-by: Jerome Marchand <jmarchan@redhat.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* block: fixup rq_init() a bitJens Axboe2008-02-08
| | | | | | | | | Rearrange fields in cache order and initialize some fields that we didn't previously init. Remove init of ->completion_data, it's part of a union with ->hash. Luckily clearing the rb node is the same as setting it to null! Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* Merge git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-2.6-dmLinus Torvalds2008-02-07
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-2.6-dm: (44 commits) dm raid1: report fault status dm raid1: handle read failures dm raid1: fix EIO after log failure dm raid1: handle recovery failures dm raid1: handle write failures dm snapshot: combine consecutive exceptions in memory dm: stripe enhanced status return dm: stripe trigger event on failure dm log: auto load modules dm: move deferred bio flushing to workqueue dm crypt: use async crypto dm crypt: prepare async callback fn dm crypt: add completion for async dm crypt: add async request mempool dm crypt: extract scatterlist processing dm crypt: tidy io ref counting dm crypt: introduce crypt_write_io_loop dm crypt: abstract crypt_write_done dm crypt: store sector mapping in dm_crypt_io dm crypt: move queue functions ...
| * dm raid1: report fault statusJonathan Brassow2008-02-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch adds extra information to the mirror status output, so that it can be determined which device(s) have failed. For each mirror device, a character is printed indicating the most severe error encountered. The characters are: * A => Alive - No failures * D => Dead - A write failure occurred leaving mirror out-of-sync * S => Sync - A sychronization failure occurred, mirror out-of-sync * R => Read - A read failure occurred, mirror data unaffected This allows userspace to properly reconfigure the mirror set. Signed-off-by: Jonathan Brassow <jbrassow@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm raid1: handle read failuresJonathan Brassow2008-02-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch gives the ability to respond-to/record device failures that happen during read operations. It also adds the ability to read from mirror devices that are not the primary if they are in-sync. There are essentially two read paths in mirroring; the direct path and the queued path. When a read request is mapped, if the region is 'in-sync' the direct path is taken; otherwise the queued path is taken. If the direct path is taken, we must record bio information so that if the read fails we can retry it. We then discover the status of a direct read through mirror_end_io. If the read has failed, we will mark the device from which the read was attempted as failed (so we don't try to read from it again), restore the bio and try again. If the queued path is taken, we discover the results of the read from 'read_callback'. If the device failed, we will mark the device as failed and attempt the read again if there is another device where this region is known to be 'in-sync'. Signed-off-by: Jonathan Brassow <jbrassow@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm raid1: fix EIO after log failureJonathan Brassow2008-02-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch adds the ability to requeue write I/O to core device-mapper when there is a log device failure. If a write to the log produces and error, the pending writes are put on the "failures" list. Since the log is marked as failed, they will stay on the failures list until a suspend happens. Suspends come in two phases, presuspend and postsuspend. We must make sure that all the writes on the failures list are requeued in the presuspend phase (a requirement of dm core). This means that recovery must be complete (because writes may be delayed behind it) and the failures list must be requeued before we return from presuspend. The mechanisms to ensure recovery is complete (or stopped) was already in place, but needed to be moved from postsuspend to presuspend. We rely on 'flush_workqueue' to ensure that the mirror thread is complete and therefore, has requeued all writes in the failures list. Because we are using flush_workqueue, we must ensure that no additional 'queue_work' calls will produce additional I/O that we need to requeue (because once we return from presuspend, we are unable to do anything about it). 'queue_work' is called in response to the following functions: - complete_resync_work = NA, recovery is stopped - rh_dec (mirror_end_io) = NA, only calls 'queue_work' if it is ready to recover the region (recovery is stopped) or it needs to clear the region in the log* **this doesn't get called while suspending** - rh_recovery_end = NA, recovery is stopped - rh_recovery_start = NA, recovery is stopped - write_callback = 1) Writes w/o failures simply call bio_endio -> mirror_end_io -> rh_dec (see rh_dec above) 2) Writes with failures are put on the failures list and queue_work is called** ** write_callbacks don't happen during suspend ** - do_failures = NA, 'queue_work' not called if suspending - add_mirror (initialization) = NA, only done on mirror creation - queue_bio = NA, 1) delayed I/O scheduled before flush_workqueue is called. 2) No more I/Os are being issued. 3) Re-attempted READs can still be handled. (Write completions are handled through rh_dec/ write_callback - mention above - and do not use queue_bio.) Signed-off-by: Jonathan Brassow <jbrassow@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm raid1: handle recovery failuresJonathan Brassow2008-02-07
| | | | | | | | | | | | | | | | | | | | This patch adds the calls to 'fail_mirror' if an error occurs during mirror recovery (aka resynchronization). 'fail_mirror' is responsible for recording the type of error by mirror device and ensuring an event gets raised for the purpose of notifying userspace. Signed-off-by: Jonathan Brassow <jbrassow@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm raid1: handle write failuresJonathan Brassow2008-02-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch gives mirror the ability to handle device failures during normal write operations. The 'write_callback' function is called when a write completes. If all the writes failed or succeeded, we report failure or success respectively. If some of the writes failed, we call fail_mirror; which increments the error count for the device, notes the type of error encountered (DM_RAID1_WRITE_ERROR), and selects a new primary (if necessary). Note that the primary device can never change while the mirror is not in-sync (IOW, while recovery is happening.) This means that the scenario where a failed write changes the primary and gives recovery_complete a chance to misread the primary never happens. The fact that the primary can change has necessitated the change to the default_mirror field. We need to protect against reading garbage while the primary changes. We then add the bio to a new list in the mirror set, 'failures'. For every bio in the 'failures' list, we call a new function, '__bio_mark_nosync', where we mark the region 'not-in-sync' in the log and properly set the region state as, RH_NOSYNC. Userspace must also be notified of the failure. This is done by 'raising an event' (dm_table_event()). If fail_mirror is called in process context the event can be raised right away. If in interrupt context, the event is deferred to the kmirrord thread - which raises the event if 'event_waiting' is set. Backwards compatibility is maintained by ignoring errors if the DM_FEATURES_HANDLE_ERRORS flag is not present. Signed-off-by: Jonathan Brassow <jbrassow@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm snapshot: combine consecutive exceptions in memoryMilan Broz2008-02-07
| | | | | | | | | | | | | | | | | | Provided sector_t is 64 bits, reduce the in-memory footprint of the snapshot exception table by the simple method of using unused bits of the chunk number to combine consecutive entries. Signed-off-by: Milan Broz <mbroz@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm: stripe enhanced status returnBrian Wood2008-02-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch adds additional information to the status line. It is added at the end of the returned text so it will not interfere with existing implementations using this data. The addition of this information will allow for a common return interface to match that returned with the dm-raid1.c status line (with Jonathan Brassow's patches). Here is a sample of what is returned with a mirror "status" call: isw_eeaaabgfg_mirror: 0 488390920 mirror 2 8:16 8:32 3727/3727 1 AA 1 core Here's what's returned with this patch for a stripe "status" call: isw_dheeijjdej_stripe: 0 976783872 striped 2 8:16 8:32 1 AA Signed-off-by: Brian Wood <brian.j.wood@intel.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm: stripe trigger event on failureBrian Wood2008-02-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch adds the stripe_end_io function to process errors that might occur after an IO operation. As part of this there are a number of enhancements made to record and trigger events: - New atomic variable in struct stripe to record the number of errors each stripe volume device has experienced (could be used later with uevents to report back directly to userspace) - New workqueue/work struct setup to process the trigger_event function - New end_io function. It is here that testing for BIO error conditions take place. It determines the exact stripe that cause the error, records this in the new atomic variable, and calls the queue_work() function - New trigger_event function to process failure events. This calls dm_table_event() Signed-off-by: Brian Wood <brian.j.wood@intel.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm log: auto load modulesJonathan Brassow2008-02-07
| | | | | | | | | | | | | | | | If the log type is not recognised, attempt to load the module 'dm-log-<type>.ko'. Signed-off-by: Jonathan Brassow <jbrassow@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm: move deferred bio flushing to workqueueMilan Broz2008-02-07
| | | | | | | | | | | | | | | | | | Add a single-thread workqueue for each mapped device and move flushing of the lists of pushback and deferred bios to this new workqueue. Signed-off-by: Milan Broz <mbroz@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm crypt: use async cryptoMilan Broz2008-02-07
| | | | | | | | | | | | | | | | | | | | dm-crypt: Use crypto ablkcipher interface Move encrypt/decrypt core to async crypto call. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Milan Broz <mbroz@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm crypt: prepare async callback fnMilan Broz2008-02-07
| | | | | | | | | | | | | | | | | | | | dm-crypt: Use crypto ablkcipher interface Prepare callback function for async crypto operation. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Milan Broz <mbroz@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm crypt: add completion for asyncMilan Broz2008-02-07
| | | | | | | | | | | | | | | | | | dm-crypt: Use crypto ablkcipher interface Prepare completion for async crypto request. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Milan Broz <mbroz@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm crypt: add async request mempoolMilan Broz2008-02-07
| | | | | | | | | | | | | | | | | | | | | | | | | | dm-crypt: Use crypto ablkcipher interface Introduce mempool for async crypto requests. cc->req is used mainly during synchronous operations (to prevent allocation and deallocation of the same object). Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Milan Broz <mbroz@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm crypt: extract scatterlist processingMilan Broz2008-02-07
| | | | | | | | | | | | | | | | | | | | dm-crypt: Use crypto ablkcipher interface Move scatterlists to separate dm_crypt_struct and pick out block processing from crypt_convert. Signed-off-by: Milan Broz <mbroz@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm crypt: tidy io ref countingMilan Broz2008-02-07
| | | | | | | | | | | | | | Make io reference counting more obvious. Signed-off-by: Milan Broz <mbroz@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm crypt: introduce crypt_write_io_loopMilan Broz2008-02-07
| | | | | | | | | | | | | | Introduce crypt_write_io_loop(). Signed-off-by: Milan Broz <mbroz@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm crypt: abstract crypt_write_doneMilan Broz2008-02-07
| | | | | | | | | | | | | | | | Process write request in separate function and queue final bio through io workqueue. Signed-off-by: Milan Broz <mbroz@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm crypt: store sector mapping in dm_crypt_ioMilan Broz2008-02-07
| | | | | | | | | | | | | | Add sector into dm_crypt_io instead of using local variable. Signed-off-by: Milan Broz <mbroz@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm crypt: move queue functionsAlasdair G Kergon2008-02-07
| | | | | | | | | | | | Reorder kcryptd functions for clarity. Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm crypt: adjust io processing functionsMilan Broz2008-02-07
| | | | | | | | | | | | | | | | Rename functions to follow calling convention. Prepare write io error processing function skeleton. Signed-off-by: Milan Broz <mbroz@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm crypt: tidy crypt_endioMilan Broz2008-02-07
| | | | | | | | | | | | | | Simplify crypt_endio function. Signed-off-by: Milan Broz <mbroz@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm crypt: move error setting outside crypt_dec_pendingMilan Broz2008-02-07
| | | | | | | | | | | | | | | | Move error code setting outside of crypt_dec_pending function. Use -EIO if crypt_convert_scatterlist() fails. Signed-off-by: Milan Broz <mbroz@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm crypt: remove unnecessary crypt_context write parmMilan Broz2008-02-07
| | | | | | | | | | | | | | Remove write attribute from convert_context and use bio flag instead. Signed-off-by: Milan Broz <mbroz@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm crypt: move convert_context inside dm_crypt_ioMilan Broz2008-02-07
| | | | | | | | | | | | | | | | Move convert_context inside dm_crypt_io. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Milan Broz <mbroz@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm mpath: add missing staticAlasdair G Kergon2008-02-07
| | | | | | | | | | | | A static declaration missing. Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm: targets no longer experimentalAlasdair G Kergon2008-02-07
| | | | | | | | | | | | | | Drop the EXPERIMENTAL tag from well-established device-mapper targets, so the newer ones stand out better. Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm: refactor dm_suspend completion waitMilan Broz2008-02-07
| | | | | | | | | | | | | | Move completion wait to separate function Signed-off-by: Milan Broz <mbroz@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm: split dm_suspend io_lock hold into twoMilan Broz2008-02-07
| | | | | | | | | | | | | | | | | | | | | | | | | | Change io_locking to allow processing flush in separate thread. Because we have DMF_BLOCK_IO already set, any possible new ios are queued in dm_requests now. In the case of interrupting previous wait there can be more ios queued (we unlocked io_lock for a while) but this is safe. Signed-off-by: Milan Broz <mbroz@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm: tidy dm_suspendMilan Broz2008-02-07
| | | | | | | | | | | | | | | | | | | | | | Tidy dm_suspend function - change return value logic in dm_suspend - use atomic_read only once. - move DMF_BLOCK_IO clearing into one place Signed-off-by: Milan Broz <mbroz@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm: refactor deferred bio_list processingMilan Broz2008-02-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Refactor deferred bio_list processing. - use separate _merge_pushback_list function - move deferred bio list pick up to flush function - use bio_list_pop instead of bio_list_get - simplify noflush flag use No real functional change in this patch. Signed-off-by: Milan Broz <mbroz@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm: tidy alloc_dev labelsMilan Broz2008-02-07
| | | | | | | | | | | | | | | | | | Tidy labels in alloc_dev to make later patches more clear. No functional change in this patch. Signed-off-by: Milan Broz <mbroz@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm ioctl: use uninitialized_varAndrew Morton2008-02-07
| | | | | | | | | | | | | | drivers/md/dm-ioctl.c:1405: warning: 'param' may be used uninitialized in this function Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm: table use uninitialized_varAndrew Morton2008-02-07
| | | | | | | | | | | | | | | | drivers/md/dm-table.c: In function 'dm_get_device': drivers/md/dm-table.c:478: warning: 'dev' may be used uninitialized in this function Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm snapshot: use uninitialized_varAndrew Morton2008-02-07
| | | | | | | | | | | | | | | | drivers/md/dm-exception-store.c: In function 'persistent_read_metadata': drivers/md/dm-exception-store.c:452: warning: 'new_snapshot' may be used uninitialized in this function Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm: convert suspend_lock semaphore to mutexDaniel Walker2008-02-07
| | | | | | | | | | | | | | Replace semaphore with mutex. Signed-off-by: Daniel Walker <dwalker@mvista.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm snapshot: use rounddown_pow_of_twoRobert P. J. Day2008-02-07
| | | | | | | | | | | | | | | | Since the source file already includes the log2.h header file, it seems pointless to re-invent the necessary routine. Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm: table remove unused totalJun'ichi Nomura2008-02-07
| | | | | | | | | | | | | | "total = 0" does nothing. Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm: table remove unused variableVasily Averin2008-02-07
| | | | | | | | | | | | | | Save some bytes. Signed-off-by: Vasily Averin <vvs@sw.ru> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm: table use list_for_eachPaul Jimenez2008-02-07
| | | | | | | | | | | | | | | | | | This patch is some minor janitorish cleanup, using some macros from linux/list.h (already #included via dm.h) to improve readability. Signed-off-by: Paul Jimenez <pj@place.org> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm ioctl: move compat codeMilan Broz2008-02-07
| | | | | | | | | | | | | | Move compat_ioctl handling into dm-ioctl.c. Signed-off-by: Milan Broz <mbroz@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm ioctl: remove lock_kernelAlasdair G Kergon2008-02-07
| | | | | | | | | | | | | | | | | | Remove lock_kernel() from the device-mapper ioctls - there should be sufficient internal locking already where required. Also remove some superfluous casts. Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm: mark function lists staticAlasdair G Kergon2008-02-07
| | | | | | | | | | | | Add a couple of statics. Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| * dm: add missing memory barrier to dm_suspendMilan Broz2008-02-07
| | | | | | | | | | | | | | Add memory barrier to fix atomic_read of pending value. Signed-off-by: Milan Broz <mbroz@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
* | Merge branch 'release' of git://lm-sensors.org/kernel/mhoffman/hwmon-2.6Linus Torvalds2008-02-07
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * 'release' of git://lm-sensors.org/kernel/mhoffman/hwmon-2.6: (59 commits) hwmon: (lm80) Add individual alarm files hwmon: (lm80) De-macro the sysfs callbacks hwmon: (lm80) Various cleanups hwmon: (w83627hf) Refactor beep enable handling hwmon: (w83627hf) Add individual alarm and beep files hwmon: (w83627hf) Enable VBAT monitoring hwmon: (w83627ehf) The W83627DHG has 8 VID pins hwmon: (asb100) Add individual alarm files hwmon: (asb100) De-macro the sysfs callbacks hwmon: (asb100) Various cleanups hwmon: VRM is not written to registers hwmon: (dme1737) fix Super-IO device ID override hwmon: (dme1737) fix divide-by-0 hwmon: (abituguru3) Add AUX4 fan input for Abit IP35 Pro hwmon: Add support for Texas Instruments/Burr-Brown ADS7828 hwmon: (adm9240) Add individual alarm files hwmon: (lm77) Add individual alarm files hwmon: Discard useless I2C driver IDs hwmon: (lm85) Make the pwmN_enable files writable hwmon: (lm85) Return standard values in pwmN_enable ...
| * | hwmon: (lm80) Add individual alarm filesJean Delvare2008-02-07
| | | | | | | | | | | | | | | | | | | | | The new libsensors needs these individual alarm files. Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com>
| * | hwmon: (lm80) De-macro the sysfs callbacksJean Delvare2008-02-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Use standard dynamic sysfs callbacks instead of macro-generated functions. This makes the code more readable, and the binary smaller (by about 34%). As a side note, another benefit of this type of cleanup is that they shrink the build time. For example, this cleanup saves about 29% of the lm80 driver build time. Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com>
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