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* dm snapshot: fix on disk chunk size validationMikulas Patocka2009-09-04
| | | | | | | | | | | | | | | | | | | | | | | Fix some problems seen in the chunk size processing when activating a pre-existing snapshot. For a new snapshot, the chunk size can either be supplied by the creator or a default value can be used. For an existing snapshot, the chunk size in the snapshot header on disk should always be used. If someone attempts to load an existing snapshot and has the 'default chunk size' option set, the kernel uses its default value even when it is incorrect for the snapshot being loaded. This patch ensures the correct on-disk value is always used. Secondly, when the code does use the chunk size stored on the disk it is prudent to revalidate it, so the code can exit cleanly if it got corrupted as happened in https://bugzilla.redhat.com/show_bug.cgi?id=461506 . Cc: stable@kernel.org Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
* dm exception store: split set_chunk_sizeMikulas Patocka2009-09-04
| | | | | | | | | Break the function set_chunk_size to two functions in preparation for the fix in the following patch. Cc: stable@kernel.org Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
* dm snapshot: fix header corruption race on invalidationMikulas Patocka2009-09-04
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If a persistent snapshot fills up, a race can corrupt the on-disk header which causes a crash on any future attempt to activate the snapshot (typically while booting). This patch fixes the race. When the snapshot overflows, __invalidate_snapshot is called, which calls snapshot store method drop_snapshot. It goes to persistent_drop_snapshot that calls write_header. write_header constructs the new header in the "area" location. Concurrently, an existing kcopyd job may finish, call copy_callback and commit_exception method, that goes to persistent_commit_exception. persistent_commit_exception doesn't do locking, relying on the fact that callbacks are single-threaded, but it can race with snapshot invalidation and overwrite the header that is just being written while the snapshot is being invalidated. The result of this race is a corrupted header being written that can lead to a crash on further reactivation (if chunk_size is zero in the corrupted header). The fix is to use separate memory areas for each. See the bug: https://bugzilla.redhat.com/show_bug.cgi?id=461506 Cc: stable@kernel.org Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
* dm snapshot: refactor zero_disk_area to use chunk_ioMikulas Patocka2009-09-04
| | | | | | | | | | | Refactor chunk_io to prepare for the fix in the following patch. Pass an area pointer to chunk_io and simplify zero_disk_area to use chunk_io. No functional change. Cc: stable@kernel.org Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
* dm log: userspace add luid to distinguish between concurrent log instancesJonathan Brassow2009-09-04
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Device-mapper userspace logs (like the clustered log) are identified by a universally unique identifier (UUID). This identifier is used to associate requests from the kernel to a specific log in userspace. The UUID must be unique everywhere, since multiple machines may use this identifier when communicating about a particular log, as is the case for cluster logs. Sometimes, device-mapper/LVM may re-use a UUID. This is the case during pvmoves, when moving from one segment of an LV to another, or when resizing a mirror, etc. In these cases, a new log is created with the same UUID and loaded in the "inactive" slot. When a device-mapper "resume" is issued, the "live" table is deactivated and the new "inactive" table becomes "live". (The "inactive" table can also be removed via a device-mapper 'clear' command.) The above two issues were colliding. More than one log was being created with the same UUID, and there was no way to distinguish between them. So, sometimes the wrong log would be swapped out during the exchange. The solution is to create a locally unique identifier, 'luid', to go along with the UUID. This new identifier is used to determine exactly which log is being referenced by the kernel when the log exchange is made. The identifier is not universally safe, but it does not need to be, since create/destroy/suspend/resume operations are bound to a specific machine; and these are the operations that make up the exchange. Signed-off-by: Jonathan Brassow <jbrassow@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
* dm raid1: do not allow log_failure variable to unset after being setJonathan Brassow2009-09-04
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch fixes a bug which was triggering a case where the primary leg could not be changed on failure even when the mirror was in-sync. The case involves the failure of the primary device along with the transient failure of the log device. The problem is that bios can be put on the 'failures' list (due to log failure) before 'fail_mirror' is called due to the primary device failure. Normally, this is fine, but if the log device failure is transient, a subsequent iteration of the work thread, 'do_mirror', will reset 'log_failure'. The 'do_failures' function then resets the 'in_sync' variable when processing bios on the failures list. The 'in_sync' variable is what is used to determine if the primary device can be switched in the event of a failure. Since this has been reset, the primary device is incorrectly assumed to be not switchable. The case has been seen in the cluster mirror context, where one machine realizes the log device is dead before the other machines. As the responsibilities of the server migrate from one node to another (because the mirror is being reconfigured due to the failure), the new server may think for a moment that the log device is fine - thus resetting the 'log_failure' variable. In any case, it is inappropiate for us to reset the 'log_failure' variable. The above bug simply illustrates that it can actually hurt us. Cc: stable@kernel.org Signed-off-by: Jonathan Brassow <jbrassow@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
* dm log: remove incorrect field from userspace table outputJonathan Brassow2009-09-04
| | | | | | | | | | | | | | | | | | | | | | The output of 'dmsetup table' includes an internal field that should not be there. This patch removes it. To make the fix simpler, we first reorder a constructor argument The 'device size' argument is generated internally. Currently it is placed as the last space-separated word of the constructor string. However, we need to use a version of the string without this word, so we move it to the beginning instead so it is trivial to skip past it. We keep a copy of the arguments passed to userspace for creating a log, just in case we need to resend them. These are the same arguments that are desired in the STATUSTYPE_TABLE request, except for one. When creating the userspace log, the userspace daemon must know the size of the mirror, so that is added to the arguments given in the constructor table. We were printing this extra argument out as well, which is a mistake. Signed-off-by: Jonathan Brassow <jbrassow@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
* dm log: fix userspace status outputJonathan Brassow2009-09-04
| | | | | | | | | | Fix 'dmsetup table' output. There is a missing ' ' at the end of the string causing two words to run together. Signed-off-by: Jonathan Brassow <jbrassow@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
* dm stripe: expose correct io hintsMike Snitzer2009-09-04
| | | | | | | | | | | | | Set sensible I/O hints for striped DM devices in the topology infrastructure added for 2.6.31 for userspace tools to obtain via sysfs. Add .io_hints to 'struct target_type' to allow the I/O hints portion (io_min and io_opt) of the 'struct queue_limits' to be set by each target and implement this for dm-stripe. Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
* dm table: add more context to terse warning messagesMike Snitzer2009-09-04
| | | | | | | | | | | | | | | | | | A couple of recent warning messages make it difficult for the reader to determine exactly what is wrong. This patch adds more information to those messages. The messages were added by these commits: 5dea271b6d87bd1d79a59c1d5baac2596a841c37 ("dm table: pass correct dev area size to device_area_is_valid") ea9df47cc92573b159ef3b4fda516c32cba9c4fd ("dm table: fix blk_stack_limits arg to use bytes not sectors") The patch also corrects references to logical_block_size in printk format strings from %hu to %u. Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
* dm table: fix queue_limit checking device iteratorMikulas Patocka2009-09-04
| | | | | | | | | | | | | | | | | | | The logic to check for valid device areas is inverted relative to proper use with iterate_devices. The iterate_devices method calls its callback for every underlying device in the target. If any callback returns non-zero, iterate_devices exits immediately. But the callback device_area_is_valid() returns 0 on error and 1 on success. The overall effect without is that an error is issued only if every device is invalid. This patch renames device_area_is_valid to device_area_is_invalid and inverts the logic so that one invalid device is sufficient to raise an error. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
* dm snapshot: implement iterate devicesMike Snitzer2009-09-04
| | | | | | | | | | | | | | | | | | Implement the .iterate_devices for the origin and snapshot targets. dm-snapshot's lack of .iterate_devices resulted in the inability to properly establish queue_limits for both targets. With 4K sector drives: an unfortunate side-effect of not establishing proper limits in either targets' DM device was that IO to the devices would fail even though both had been created without error. Commit af4874e03ed82f050d5872d8c39ce64bf16b5c38 ("dm target:s introduce iterate devices fn") in 2.6.31-rc1 should have implemented .iterate_devices for dm-snap.c's origin and snapshot targets. Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
* dm multipath: fix oops when request based io fails when no pathsKiyoshi Ueda2009-09-04
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The patch posted at http://marc.info/?l=dm-devel&m=124539787228784&w=2 which was merged into cec47e3d4a861e1d942b3a580d0bbef2700d2bb2 ("dm: prepare for request based option") introduced a regression in request-based dm. If map_request() calls dm_kill_unmapped_request() to complete a cloned bio without dispatching it, clone->bio is still set when dm_end_request() is called and the BUG_ON(clone->bio) is incorrect. The patch fixes this bug by freeing bio in dm_end_request() if the clone has bio. I've redone my tests to cover all I/O paths and confirmed there's no other regression. Here is the oops I hit in request-based dm when I do I/O to a multipath device which doesn't have any active path nor queue_if_no_path setting: ------------[ cut here ]------------ kernel BUG at /root/2.6.31-rc4.rqdm/drivers/md/dm.c:828! invalid opcode: 0000 [#1] SMP last sysfs file: /sys/devices/system/cpu/cpu3/cache/index2/shared_cpu_map CPU 1 Modules linked in: autofs4 sunrpc cpufreq_ondemand acpi_cpufreq dm_mirror dm_region_hash dm_log dm_service_time dm_multipath scsi_dh dm_mod video output sbs sbshc battery ac sg sr_mod e1000e button cdrom serio_raw rtc_cmos rtc_core rtc_lib piix lpfc scsi_transport_fc ata_piix libata megaraid_sas sd_mod scsi_mod crc_t10dif ext3 jbd uhci_hcd ohci_hcd ehci_hcd [last unloaded: microcode] Pid: 7, comm: ksoftirqd/1 Not tainted 2.6.31-rc4.rqdm #1 Express5800/120Lj [N8100-1417] RIP: 0010:[<ffffffffa023629d>] [<ffffffffa023629d>] dm_softirq_done+0xbd/0x100 [dm_mod] RSP: 0018:ffff8800280a1f08 EFLAGS: 00010282 RAX: ffffffffa02544e0 RBX: ffff8802aa1111d0 RCX: ffff8802aa1111e0 RDX: ffff8802ab913e70 RSI: 0000000000000000 RDI: ffff8802ab913e70 RBP: ffff8800280a1f28 R08: ffffc90005457040 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 00000000fffffffb R13: ffff8802ab913e88 R14: ffff8802ab9c1438 R15: 0000000000000100 FS: 0000000000000000(0000) GS:ffff88002809e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b CR2: 0000003d54a98640 CR3: 000000029f0a1000 CR4: 00000000000006e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process ksoftirqd/1 (pid: 7, threadinfo ffff8802ae50e000, task ffff8802ae4f8040) Stack: ffff8800280a1f38 0000000000000020 ffffffff814f30a0 0000000000000004 <0> ffff8800280a1f58 ffffffff8116b245 ffff8800280a1f38 ffff8800280a1f38 <0> ffff8800280a1f58 0000000000000001 ffff8800280a1fa8 ffffffff810477bc Call Trace: <IRQ> [<ffffffff8116b245>] blk_done_softirq+0x75/0x90 [<ffffffff810477bc>] __do_softirq+0xcc/0x210 [<ffffffff81047170>] ? ksoftirqd+0x0/0x110 [<ffffffff8100ce7c>] call_softirq+0x1c/0x50 <EOI> [<ffffffff8100e785>] do_softirq+0x65/0xa0 [<ffffffff81047170>] ? ksoftirqd+0x0/0x110 [<ffffffff810471e0>] ksoftirqd+0x70/0x110 [<ffffffff81059559>] kthread+0x99/0xb0 [<ffffffff8100cd7a>] child_rip+0xa/0x20 [<ffffffff8100c73c>] ? restore_args+0x0/0x30 [<ffffffff810594c0>] ? kthread+0x0/0xb0 [<ffffffff8100cd70>] ? child_rip+0x0/0x20 Code: 44 89 e6 48 89 df e8 23 fb f2 e0 be 01 00 00 00 4c 89 f7 e8 f6 fd ff ff 5b 41 5c 41 5d 41 5e c9 c3 4c 89 ef e8 85 fe ff ff eb ed <0f> 0b eb fe 41 8b 85 dc 00 00 00 48 83 bb 10 01 00 00 00 89 83 RIP [<ffffffffa023629d>] dm_softirq_done+0xbd/0x100 [dm_mod] RSP <ffff8800280a1f08> ---[ end trace 16af0a1d8542da55 ]--- Signed-off-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com> Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
* Merge branch 'for-linus' of git://neil.brown.name/mdLinus Torvalds2009-08-18
|\ | | | | | | | | * 'for-linus' of git://neil.brown.name/md: Fix new incorrect error return from do_md_stop.
| * Fix new incorrect error return from do_md_stop.NeilBrown2009-08-17
| | | | | | | | | | | | | | | | | | | | | | Recent commit c8c00a6915a2e3d10416e8bdd3138429beb96210 changed the exit paths in do_md_stop and was not quite careful enough. There is one path were 'err' now needs to be cleared but it isn't. So setting an array to readonly (with mdadm --readonly) will work, but will incorrectly report and error: ENXIO. Signed-off-by: NeilBrown <neilb@suse.de>
* | dm-log-userspace: fix printk format warningRandy Dunlap2009-08-16
|/ | | | | | | | | | | drivers/md/dm-log-userspace-transfer.c:110: warning: format '%lu' expects type 'long unsigned int', but argument 4 has type 'size_t' Previously posted and acked, but apparently lost. http://lkml.indiana.edu/hypermail/linux/kernel/0906.2/02074.html Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Cc: dm-devel@redhat.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* md: allow upper limit for resync/reshape to be set when array is read-onlyNeilBrown2009-08-12
| | | | | | | | | | | | | | | | | Normally we only allow the upper limit for a reshape to be decreased when the array not performing a sync/recovery/reshape, otherwise there could be races. But if an array is part-way through a reshape when it is assembled the reshape is started immediately leaving no window to set an upper bound. If the array is started read-only, the reshape will be suspended until the array becomes writable, so that provides a window during which it is perfectly safe to reduce the upper limit of a reshape. So: allow the upper limit (sync_max) to be reduced even if the reshape thread is running, as long as the array is still read-only. Signed-off-by: NeilBrown <neilb@suse.de>
* md/raid5: Properly remove excess drives after shrinking a raid5/6NeilBrown2009-08-12
| | | | | | | | We were removing the drives, from the array, but not removing symlinks from /sys/.... and not marking the device as having been removed. Signed-off-by: NeilBrown <neilb@suse.de>
* md/raid5: make sure a reshape restarts at the correct address.NeilBrown2009-08-12
| | | | | | | | This "if" don't allow for the possibility that the number of devices doesn't change, and so sector_nr isn't set correctly in that case. So change '>' to '>='. Signed-off-by: NeilBrown <neilb@suse.de>
* md/raid5: allow new reshape modes to be restarted in the middle.NeilBrown2009-08-12
| | | | | | | | | | | | | | | | | | | | | | md/raid5 doesn't allow a reshape to restart if it involves writing over the same part of disk that it would be reading from. This happens at the beginning of a reshape that increases the number of devices, at the end of a reshape that decreases the number of devices, and continuously for a reshape that does not change the number of devices. The current code is correct for the "increase number of devices" case as the critical section at the start is handled by userspace performing a backup. It does not work for reducing the number of devices, or the no-change case. For 'reducing', we need to invert the test. For no-change we cannot really be sure things will be safe, so simply require the array to be read-only, which is how the user-space code which carefully starts such arrays works. Signed-off-by: NeilBrown <neilb@suse.de>
* md: never advance 'events' counter by more than 1.NeilBrown2009-08-12
| | | | | | | | | | | | | | | | | | | | | | | | When assembling arrays, md allows two devices to have different event counts as long as the difference is only '1'. This is to cope with a system failure between updating the metadata on two difference devices. However there are currently times when we update the event count by 2. This was done to keep the event count even when the array is clean and odd when it is dirty, which allows us to avoid writing common update to spare devices and so allow those spares to go to sleep. This is bad for the above reason. So change it to never increase by two. This means that the alignment between 'odd/even' and 'clean/dirty' might take a little longer to attain, but that is only a small cost. The spares will get a few more updates but that will still be spared (;-) most updates and can still go to sleep. Prior to this patch there was a small chance that after a crash an array would fail to assemble due to the overly large event count mismatch. Signed-off-by: NeilBrown <neilb@suse.de>
* Remove deadlock potential in md_openNeilBrown2009-08-09
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | A recent commit: commit 449aad3e25358812c43afc60918c5ad3819488e7 introduced the possibility of an A-B/B-A deadlock between bd_mutex and reconfig_mutex. __blkdev_get holds bd_mutex while calling md_open which takes reconfig_mutex, do_md_run is always called with reconfig_mutex held, and it now takes bd_mutex in the call the revalidate_disk. This potential deadlock was not caught by lockdep due to the use of mutex_lock_interruptible_nexted which was introduced by commit d63a5a74dee87883fda6b7d170244acaac5b05e8 do avoid a warning of an impossible deadlock. It is quite possible to split reconfig_mutex in to two locks. One protects the array data structures while it is being reconfigured, the other ensures that an array is never even partially open while it is being deactivated. In particular, the second lock prevents an open from completing between the time when do_md_stop checks if there are any active opens, and the time when the array is either set read-only, or when ->pers is set to NULL. So we can be certain that no IO is in flight as the array is being destroyed. So create a new lock, open_mutex, just to ensure exclusion between 'open' and 'stop'. This avoids the deadlock and also avoids the lockdep warning mentioned in commit d63a5a74d Reported-by: "Mike Snitzer" <snitzer@gmail.com> Reported-by: "H. Peter Anvin" <hpa@zytor.com> Signed-off-by: NeilBrown <neilb@suse.de>
* md: Use revalidate_disk to effect changes in size of device.NeilBrown2009-08-02
| | | | | | | | | | | | As revalidate_disk calls check_disk_size_change, it will cause any capacity change of a gendisk to be propagated to the blockdev inode. So use that instead of mucking about with locks and i_size_write. Also add a call to revalidate_disk in do_md_run and a few other places where the gendisk capacity is changed. Signed-off-by: NeilBrown <neilb@suse.de>
* md: allow raid5_quiesce to work properly when reshape is happening.NeilBrown2009-08-02
| | | | | | | | | | | | | | | | | The ->quiesce method is not supposed to stop resync/recovery/reshape, just normal IO. But in raid5 we don't have a way to know which stripes are being used for normal IO and which for resync etc, so we need to wait for all stripes to be idle to be sure that all writes have completed. However reshape keeps at least some stripe busy for an extended period of time, so a call to raid5_quiesce can block for several seconds needlessly. So arrange for reshape etc to pause briefly while raid5_quiesce is trying to quiesce the array so that the active_stripes count can drop to zero. Signed-off-by: NeilBrown <neilb@suse.de>
* md/raid5: set reshape_position correctly when reshape starts.NeilBrown2009-08-02
| | | | | | | | | As the internal reshape_progress counter is the main driver for reshape, the fact that reshape_position sometimes starts with the wrong value has minimal effect. It is visible in sysfs and that is all. Signed-off-by: NeilBrown <neilb@suse.de>
* md: Handle growth of v1.x metadata correctly.NeilBrown2009-08-02
| | | | | | | | | | | | | | The v1.x metadata does not have a fixed size and can grow when devices are added. If it grows enough to require an extra sector of storage, we need to update the 'sb_size' to match. Without this, md can write out an incomplete superblock with a bad checksum, which will be rejected when trying to re-assemble the array. Cc: stable@kernel.org Signed-off-by: NeilBrown <neilb@suse.de>
* md: avoid array overflow with bad v1.x metadataNeilBrown2009-08-02
| | | | | | | | We trust the 'desc_nr' field in v1.x metadata enough to use it as an index in an array. This isn't really safe. So range-check the value first. Signed-off-by: NeilBrown <neilb@suse.de>
* md: when a level change reduces the number of devices, remove the excess.NeilBrown2009-08-02
| | | | | | | | | | | When an array is changed from RAID6 to RAID5, fewer drives are needed. So any device that is made superfluous by the level conversion must be marked as not-active. For the RAID6->RAID5 conversion, this will be a drive which only has 'Q' blocks on it. Cc: stable@kernel.org Signed-off-by: NeilBrown <neilb@suse.de>
* md: Push down data integrity code to personalities.Andre Noll2009-08-02
| | | | | | | | | | | | | | | | | | | | | | | | | This patch replaces md_integrity_check() by two new public functions: md_integrity_register() and md_integrity_add_rdev() which are both personality-independent. md_integrity_register() is called from the ->run and ->hot_remove methods of all personalities that support data integrity. The function iterates over the component devices of the array and determines if all active devices are integrity capable and if their profiles match. If this is the case, the common profile is registered for the mddev via blk_integrity_register(). The second new function, md_integrity_add_rdev() is called from the ->hot_add_disk methods, i.e. whenever a new device is being added to a raid array. If the new device does not support data integrity, or has a profile different from the one already registered, data integrity for the mddev is disabled. For raid0 and linear, only the call to md_integrity_register() from the ->run method is necessary. Signed-off-by: Andre Noll <maan@systemlinux.org> Signed-off-by: NeilBrown <neilb@suse.de>
* md/raid6: release spare page at ->stop()Dan Williams2009-07-30
| | | | | | | | | Add missing call to safe_put_page from stop() by unifying open coded raid5_conf_t de-allocation under free_conf(). Cc: <stable@kernel.org> Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: NeilBrown <neilb@suse.de>
* dm table: pass correct dev area size to device_area_is_validMike Snitzer2009-07-23
| | | | | | | | | | | | | | | | Incorrect device area lengths are being passed to device_area_is_valid(). The regression appeared in 2.6.31-rc1 through commit 754c5fc7ebb417b23601a6222a6005cc2e7f2913. With the dm-stripe target, the size of the target (ti->len) was used instead of the stripe_width (ti->len/#stripes). An example of a consequent incorrect error message is: device-mapper: table: 254:0: sdb too small for target Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
* dm: remove queue next_ordered workaround for barriersMike Snitzer2009-07-23
| | | | | | | | | | | | | | | | | | | | | | | | | | This patch removes DM's bio-based vs request-based conditional setting of next_ordered. For bio-based DM the next_ordered check is no longer a concern (as that check is now in the __make_request path). For request-based DM the default of QUEUE_ORDERED_NONE is now appropriate. bio-based DM was changed to work-around the previously misplaced next_ordered check with this commit: 99360b4c18f7675b50d283301d46d755affe75fd request-based DM does not yet support barriers but reacted to the above bio-based DM change with this commit: 5d67aa2366ccb8257d103d0b43df855605c3c086 The above changes are no longer needed given Neil Brown's recent fix to put the next_ordered check in the __make_request path: db64f680ba4b5c56c4be59f0698000df89ff0281 Signed-off-by: Mike Snitzer <snitzer@redhat.com> Cc: Jun'ichi Nomura <j-nomura@ce.jp.nec.com> Cc: NeilBrown <neilb@suse.de> Acked-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com> Acked-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
* dm raid1: wake kmirrord when requeueing delayed bios after remote recoveryMikulas Patocka2009-07-23
| | | | | | | | | | | | | | | The recent commit 7513c2a761d69d2a93f17146b3563527d3618ba0 (dm raid1: add is_remote_recovering hook for clusters) changed do_writes() to update the ms->writes list but forgot to wake up kmirrord to process it. The rule is that when anything is being added on ms->reads, ms->writes or ms->failures and the list was empty before we must call wakeup_mirrord (for immediate processing) or delayed_wake (for delayed processing). Otherwise the bios could sit on the list indefinitely. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> CC: stable@kernel.org Signed-off-by: Alasdair G Kergon <agk@redhat.com>
* Fix congestion_wait() sync/async vs read/write confusionJens Axboe2009-07-10
| | | | | | | | Commit 1faa16d22877f4839bd433547d770c676d1d964c accidentally broke the bdi congestion wait queue logic, causing us to wait on congestion for WRITE (== 1) when we really wanted BLK_RW_ASYNC (== 0) instead. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* Remove multiple KERN_ prefixes from printk formatsJoe Perches2009-07-08
| | | | | | | | | | | | | | 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>
* Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-blockLinus Torvalds2009-07-01
|\ | | | | | | | | | | | | | | | | | | | | * 'for-linus' of git://git.kernel.dk/linux-2.6-block: cfq-iosched: remove redundant check for NULL cfqq in cfq_set_request() blocK: Restore barrier support for md and probably other virtual devices. block: get rid of queue-private command filter block: Create bip slabs with embedded integrity vectors cfq-iosched: get rid of the need for __GFP_NOFAIL in cfq_find_alloc_queue() cfq-iosched: move cfqq initialization out of cfq_find_alloc_queue() Trivial typo fixes in Documentation/block/data-integrity.txt.
| * block: Create bip slabs with embedded integrity vectorsMartin K. Petersen2009-07-01
| | | | | | | | | | | | | | | | | | | | | | | | | | This patch restores stacking ability to the block layer integrity infrastructure by creating a set of dedicated bip slabs. Each bip slab has an embedded bio_vec array at the end. This cuts down on memory allocations and also simplifies the code compared to the original bvec version. Only the largest bip slab is backed by a mempool. The pool is contained in the bio_set so stacking drivers can ensure forward progress. Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Jens Axboe <axboe@carl.(none)>
* | Merge branch 'for-linus' of git://neil.brown.name/mdLinus Torvalds2009-07-01
|\ \ | |/ |/| | | | | | | | | | | | | | | * 'for-linus' of git://neil.brown.name/md: md: use interruptible wait when duration is controlled by userspace. md/raid5: suspend shouldn't affect read requests. md: tidy up error paths in md_alloc md: fix error path when duplicate name is found on md device creation. md: avoid dereferencing NULL pointer when accessing suspend_* sysfs attributes. md: Use new topology calls to indicate alignment and I/O sizes
| * md: use interruptible wait when duration is controlled by userspace.NeilBrown2009-06-30
| | | | | | | | | | | | | | | | | | | | | | User space can set various limits on an md array so that resync waits when it gets to a certain point, or so that I/O is blocked for a short while. When md is waiting against one of these limit, it should use an interruptible wait so as not to add to the load average, and so are not to trigger a warning if the wait goes on for too long. Signed-off-by: NeilBrown <neilb@suse.de>
| * md/raid5: suspend shouldn't affect read requests.NeilBrown2009-06-30
| | | | | | | | | | | | | | | | | | | | md allows write to regions on an array to be suspended temporarily. This allows user-space to participate is aspects of reshape. In particular, data can be copied with not risk of a race. We should not be blocking read requests though, so don't. Cc: stable@kernel.org Signed-off-by: NeilBrown <neilb@suse.de>
| * md: tidy up error paths in md_allocNeilBrown2009-06-30
| | | | | | | | | | | | | | | | | | As the recent bug in md_alloc showed, having a single exit path for unlocking and putting is a good idea. So restructure md_alloc to have a single mutex_unlock and mddev_put, and use gotos where necessary. Found-by: Jiri Slaby <jirislaby@gmail.com> Signed-off-by: NeilBrown <neilb@suse.de>
| * md: fix error path when duplicate name is found on md device creation.NeilBrown2009-06-30
| | | | | | | | | | | | | | | | | | | | | | | | When an md device is created by name (rather than number) we need to check that the name is not already in use. If this check finds a duplicate, we return an error without dropping the lock or freeing the newly create mddev. This patch fixes that. Cc: stable@kernel.org Found-by: Jiri Slaby <jirislaby@gmail.com> Signed-off-by: NeilBrown <neilb@suse.de>
| * md: avoid dereferencing NULL pointer when accessing suspend_* sysfs attributes.NeilBrown2009-06-30
| | | | | | | | | | | | | | | | | | | | If we try to modify one of the md/ sysfs files suspend_lo or suspend_hi when the array is not active, we dereference a NULL. Protect against that. Cc: stable@kernel.org Signed-off-by: NeilBrown <neilb@suse.de>
| * md: Use new topology calls to indicate alignment and I/O sizesMartin K. Petersen2009-06-30
| | | | | | | | | | | | | | | | | | | | | | Switch MD over to the new disk_stack_limits() function which checks for aligment and adjusts preferred I/O sizes when stacking. Also indicate preferred I/O sizes where applicable. Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: NeilBrown <neilb@suse.de>
* | dm table: fix blk_stack_limits arg to use bytes not sectorsMike Snitzer2009-06-30
| | | | | | | | | | | | | | | | | | | | | | The offset passed to blk_stack_limits() must be in bytes not sectors. Fixes false warnings like the following: device-mapper: table: 254:1: target device sda6 is misaligned Signed-off-by: Mike Snitzer <snitzer@redhat.com> Reported-by: Frans Pop <elendil@planet.nl> Tested-by: Frans Pop <elendil@planet.nl> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
* | dm exception store: really fix type lookupMilan Broz2009-06-30
|/ | | | | | | | | | | | | | | Fix exception store name handling. We need to reference exception store by zero terminated string. Fixes regression introduced in commit f6bd4eb73cdf2a5bf954e497972842f39cabb7e3 Cc: Yi Yang <yi.y.yang@intel.com> Cc: Jonathan Brassow <jbrassow@redhat.com> Cc: stable@kernel.org Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Milan Broz <mbroz@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
* dm mpath: change to be request basedKiyoshi Ueda2009-06-22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch converts dm-multipath target to request-based from bio-based. Basically, the patch just converts the I/O unit from struct bio to struct request. In the course of the conversion, it also changes the I/O queueing mechanism. The change in the I/O queueing is described in details as follows. I/O queueing mechanism change ----------------------------- In I/O submission, map_io(), there is no mechanism change from bio-based, since the clone request is ready for retry as it is. However, in I/O complition, do_end_io(), there is a mechanism change from bio-based, since the clone request is not ready for retry. In do_end_io() of bio-based, the clone bio has all needed memory for resubmission. So the target driver can queue it and resubmit it later without memory allocations. The mechanism has almost no overhead. On the other hand, in do_end_io() of request-based, the clone request doesn't have clone bios, so the target driver can't resubmit it as it is. To resubmit the clone request, memory allocation for clone bios is needed, and it takes some overheads. To avoid the overheads just for queueing, the target driver doesn't queue the clone request inside itself. Instead, the target driver asks dm core for queueing and remapping the original request of the clone request, since the overhead for queueing is just a freeing memory for the clone request. As a result, the target driver doesn't need to record/restore the information of the original request for resubmitting the clone request. So dm_bio_details in dm_mpath_io is removed. multipath_busy() --------------------- The target driver returns "busy", only when the following case: o The target driver will map I/Os, if map() function is called and o The mapped I/Os will wait on underlying device's queue due to their congestions, if map() function is called now. In other cases, the target driver doesn't return "busy". Otherwise, dm core will keep the I/Os and the target driver can't do what it wants. (e.g. the target driver can't map I/Os now, so wants to kill I/Os.) Signed-off-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com> Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com> Acked-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
* dm: disable interrupt when taking map_lockKiyoshi Ueda2009-06-22
| | | | | | | | | | | | | | | | | | | This patch disables interrupt when taking map_lock to avoid lockdep warnings in request-based dm. request-based dm takes map_lock after taking queue_lock with disabling interrupt: spin_lock_irqsave(queue_lock) q->request_fn() == dm_request_fn() => dm_get_table() => read_lock(map_lock) while queue_lock could be (but isn't) taken in interrupt context. Signed-off-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com> Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com> Acked-by: Christof Schmitt <christof.schmitt@de.ibm.com> Acked-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
* dm: do not set QUEUE_ORDERED_DRAIN if request basedKiyoshi Ueda2009-06-22
| | | | | | | | | | | | Request-based dm doesn't have barrier support yet. So we need to set QUEUE_ORDERED_DRAIN only for bio-based dm. Since the device type is decided at the first table loading time, the flag set is deferred until then. Signed-off-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com> Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com> Acked-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
* dm: enable request based optionKiyoshi Ueda2009-06-22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch enables request-based dm. o Request-based dm and bio-based dm coexist, since there are some target drivers which are more fitting to bio-based dm. Also, there are other bio-based devices in the kernel (e.g. md, loop). Since bio-based device can't receive struct request, there are some limitations on device stacking between bio-based and request-based. type of underlying device bio-based request-based ---------------------------------------------- bio-based OK OK request-based -- OK The device type is recognized by the queue flag in the kernel, so dm follows that. o The type of a dm device is decided at the first table binding time. Once the type of a dm device is decided, the type can't be changed. o Mempool allocations are deferred to at the table loading time, since mempools for request-based dm are different from those for bio-based dm and needed mempool type is fixed by the type of table. o Currently, request-based dm supports only tables that have a single target. To support multiple targets, we need to support request splitting or prevent bio/request from spanning multiple targets. The former needs lots of changes in the block layer, and the latter needs that all target drivers support merge() function. Both will take a time. Signed-off-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com> Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
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