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path: root/drivers/md/md.c
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2008-06-28Don't reject HOT_REMOVE_DISK request for an array that is not yet started.Neil Brown
There is really no need for this test here, and there are valid cases for selectively removing devices from an array that it not actually active. Signed-off-by: Neil Brown <neilb@suse.de>
2008-06-28rationalise return value for ->hot_add_disk method.Neil Brown
For all array types but linear, ->hot_add_disk returns 1 on success, 0 on failure. For linear, it returns 0 on success and -errno on failure. This doesn't cause a functional problem because the ->hot_add_disk function of linear is used quite differently to the others. However it is confusing. So convert all to return 0 for success or -errno on failure and fix call sites to match. Signed-off-by: Neil Brown <neilb@suse.de>
2008-06-28Support adding a spare to a live md array with external metadata.Neil Brown
i.e. extend the 'md/dev-XXX/slot' attribute so that you can tell a device to fill an vacant slot in an and md array. Signed-off-by: Neil Brown <neilb@suse.de>
2008-06-28Enable setting of 'offset' and 'size' of a hot-added spare.Neil Brown
offset_store and rdev_size_store allow control of the region of a device which is to be using in an md/raid array. They only allow these values to be set when an array is being assembled, as changing them on an active array could be dangerous. However when adding a spare device to an array, we might need to set the offset and size before starting recovery. So allow these values to be set also if "->raid_disk < 0" which indicates that the device is still a spare. Signed-off-by: Neil Brown <neilb@suse.de>
2008-06-28Don't try to make md arrays dirty if that is not meaningful.Neil Brown
Arrays personalities such as 'raid0' and 'linear' have no redundancy, and so marking them as 'clean' or 'dirty' is not meaningful. So always allow write requests without requiring a superblock update. Such arrays types are detected by ->sync_request being NULL. If it is not possible to send a sync request we don't need a 'dirty' flag because all a dirty flag does is trigger some sync_requests. Signed-off-by: Neil Brown <neilb@suse.de>
2008-06-28Close race in md_probeNeil Brown
There is a possible race in md_probe. If two threads call md_probe for the same device, then one could exit (having checked that ->gendisk exists) before the other has called kobject_init_and_add, thus returning an incomplete kobj which will cause problems when we try to add children to it. So extend the range of protection of disks_mutex slightly to avoid this possibility. Signed-off-by: Neil Brown <neilb@suse.de>
2008-06-28Allow setting start point for requested check/repairNeil Brown
This makes it possible to just resync a small part of an array. e.g. if a drive reports that it has questionable sectors, a 'repair' of just the region covering those sectors will cause them to be read and, if there is an error, re-written with correct data. Signed-off-by: Neil Brown <neilb@suse.de>
2008-06-28Fix error paths if md_probe fails.Neil Brown
md_probe can fail (e.g. alloc_disk could fail) without returning an error (as it alway returns NULL). So when we call mddev_find immediately afterwards, we need to check that md_probe actually succeeded. This means checking that mdev->gendisk is non-NULL. cc: <stable@kernel.org> Cc: Dave Jones <davej@redhat.com> Signed-off-by: Neil Brown <neilb@suse.de>
2008-06-06md: fix uninitialized use of mddev->recovery_waitDan Williams
If an array was created with --assume-clean we will oops when trying to set ->resync_max. Fix this by initializing ->recovery_wait in mddev_find. Cc: <stable@kernel.org> Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-05-24md: restart recovery cleanly after device failure.NeilBrown
When we get any IO error during a recovery (rebuilding a spare), we abort the recovery and restart it. For RAID6 (and multi-drive RAID1) it may not be best to restart at the beginning: when multiple failures can be tolerated, the recovery may be able to continue and re-doing all that has already been done doesn't make sense. We already have the infrastructure to record where a recovery is up to and restart from there, but it is not being used properly. This is because: - We sometimes abort with MD_RECOVERY_ERR rather than just MD_RECOVERY_INTR, which causes the recovery not be be checkpointed. - We remove spares and then re-added them which loses important state information. The distinction between MD_RECOVERY_ERR and MD_RECOVERY_INTR really isn't needed. If there is an error, the relevant drive will be marked as Faulty, and that is enough to ensure correct handling of the error. So we first remove MD_RECOVERY_ERR, changing some of the uses of it to MD_RECOVERY_INTR. Then we cause the attempt to remove a non-faulty device from an array to fail (unless recovery is impossible as the array is too degraded). Then when remove_and_add_spares attempts to remove the devices on which recovery can continue, it will fail, they will remain in place, and recovery will continue on them as desired. Issue: If we are halfway through rebuilding a spare and another drive fails, and a new spare is immediately available, do we want to: 1/ complete the current rebuild, then go back and rebuild the new spare or 2/ restart the rebuild from the start and rebuild both devices in parallel. Both options can be argued for. The code currently takes option 2 as a/ this requires least code change b/ this results in a minimally-degraded array in minimal time. Cc: "Eivind Sarto" <ivan@kasenna.com> Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-05-24md: allow parallel resync of md-devices.Bernd Schubert
In some configurations, a raid6 resync can be limited by CPU speed (Calculating P and Q and moving data) rather than by device speed. In these cases there is nothing to be gained byt serialising resync of arrays that share a device, and doing the resync in parallel can provide benefit. So add a sysfs tunable to flag an array as being allowed to resync in parallel with other arrays that use (a different part of) the same device. Signed-off-by: Bernd Schubert <bs@q-leap.de> Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-05-24md: notify userspace on 'stop' eventsDan Williams
This additional notification to 'array_state' is needed to allow the monitor application to learn about stop events via sysfs. The sysfs_notify("sync_action") call that comes at the end of do_md_stop() (via md_new_event) is insufficient since the 'sync_action' attribute has been removed by this point. (Seems like a sysfs-notify-on-removal patch is a better fix. Currently removal updates the event count but does not wake up waiters) Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-05-24md: notify userspace on 'write-pending' changes to array_stateNeilBrown
When an array enters write pending, 'array_state' changes, so we must be sure to sysfs_notify. Also, when waiting for user-space to acknowledge 'write-pending' by marking the metadata as dirty, we don't want to wait for MD_CHANGE_DEVS to be cleared as that might not happen. So explicity test for the bits that we are really interested in. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-05-24md: kill file_path wrapperChristoph Hellwig
Kill the trivial and rather pointless file_path wrapper around d_path. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-04-30md: support blocking writes to an array on device failureDan Williams
Allows a userspace metadata handler to take action upon detecting a device failure. Based on an original patch by Neil Brown. Changes: -added blocked_wait waitqueue to rdev -don't qualify Blocked with Faulty always let userspace block writes -added md_wait_for_blocked_rdev to wait for the block device to be clear, if userspace misses the notification another one is sent every 5 seconds -set MD_RECOVERY_NEEDED after clearing "blocked" -kill DoBlock flag, just test mddev->external Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-04-30md: prevent duplicates in bind_rdev_to_arrayDan Williams
Found when trying to reassemble an active externally managed array. Without this check we hit the more noisy "sysfs duplicate" warning in the later call to kobject_add. Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-04-30md: remove a stray command from a copy and paste error in resync_start_storeDan Williams
Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-04-30md: fix up switching md arrays between read-only and read-writeNeilBrown
When setting an array to 'readonly' or to 'active' via sysfs, we must make the appropriate set_disk_ro call too. Also when switching to "read_auto" (which is like readonly, but blocks on the first write so that metadata can be marked 'dirty') we need to be more careful about what state we are changing from. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-04-30md: fix 'safemode' handling for external metadata.NeilBrown
'safemode' relates to marking an array as 'clean' if there has been no write traffic for a while (a couple of seconds), to reduce the chance of the array being found dirty on reboot. ->safemode is set to '1' when there have been no write for a while, and it gets set to '0' when the superblock is updates with the 'clean' flag set. This requires a few fixes for 'external' metadata: - When an array is set to 'clean' via sysfs, 'safemode' must be cleared. - when we write to an array that has 'safemode' set (there must have been some delay in updating the metadata), we need to clear safemode. - Don't try to update external metadata in md_check_recovery for safemode transitions - it won't work. Also, don't try to support "immediate safe mode" (safemode==2) for external metadata, it cannot really work (the safemode timeout can be set very low if this is really needed). Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-04-30md: reinitialise more mddev fields in do_md_stop.NeilBrown
I keep finding problems where an mddev gets reused and some fields has a value from a previous usage that confuses the new usage. So clear all fields that could possible need clearing when calling do_md_stop. Also initialise the 'level' of a new array to LEVEL_NONE (which isn't 0). Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-04-30md: skip all metadata update processing when using external metadata.NeilBrown
All the metadata update processing for external metadata is on in user-space or through the sysfs interfaces, so make "md_update_sb" a no-op in that case. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-04-30md: fix use after free when removing rdev via sysfsDan Williams
rdev->mddev is no longer valid upon return from entry->store() when the 'remove' command is given. Cc: <stable@kernel.org> Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-04-29Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-blockLinus Torvalds
* 'for-linus' of git://git.kernel.dk/linux-2.6-block: block: Skip I/O merges when disabled block: add large command support block: replace sizeof(rq->cmd) with BLK_MAX_CDB ide: use blk_rq_init() to initialize the request block: use blk_rq_init() to initialize the request block: rename and export rq_init() block: no need to initialize rq->cmd with blk_get_request block: no need to initialize rq->cmd in prepare_flush_fn hook block/blk-barrier.c:blk_ordered_cur_seq() mustn't be inline block/elevator.c:elv_rq_merge_ok() mustn't be inline block: make queue flags non-atomic block: add dma alignment and padding support to blk_rq_map_kern unexport blk_max_pfn ps3disk: Remove superfluous cast block: make rq_init() do a full memset() relay: fix splice problem
2008-04-29drivers: use non-racy method for proc entries creation (2)Denis V. Lunev
Use proc_create()/proc_create_data() to make sure that ->proc_fops and ->data be setup before gluing PDE to main tree. Signed-off-by: Denis V. Lunev <den@openvz.org> Cc: Greg Kroah-Hartman <gregkh@suse.de> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Peter Osterlund <petero2@telia.com> Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Cc: Dmitry Torokhov <dtor@mail.ru> Cc: Neil Brown <neilb@suse.de> Cc: Mauro Carvalho Chehab <mchehab@infradead.org> Cc: Bjorn Helgaas <bjorn.helgaas@hp.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-04-29block: make queue flags non-atomicNick Piggin
We can save some atomic ops in the IO path, if we clearly define the rules of how to modify the queue flags. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2008-04-28md: fix integer as NULL pointer warnings in md.cHarvey Harrison
drivers/md/md.c:734:16: warning: Using plain integer as NULL pointer drivers/md/md.c:1115:16: warning: Using plain integer as NULL pointer Add some braces to match the else-block as well. Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Cc: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-04-21RAID: remove trailing space from printk lineNick Andrew
drivers/md/*.[ch] contains only one more printk line with a trailing space. Remove it. Signed-off-by: Nick Andrew <nick@nick-andrew.net> Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
2008-03-19md: remove the 'super' sysfs attribute from devices in an 'md' arrayNeilBrown
Exposing the binary blob which is the md 'super-block' via sysfs doesn't really fit with the whole sysfs model, and ever since commit 8118a859dc7abd873193986c77a8d9bdb877adc8 ("sysfs: fix off-by-one error in fill_read_buffer()") it doesn't actually work at all (as the size of the blob is often one page). (akpm: as in, fs/sysfs/file.c:fill_read_buffer() goes BUG) So just remove it altogether. It isn't really useful. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-03-10md: fix formatting error in /proc/mdstatNeilBrown
If an md array is "auto-read-only", then this appears in /proc/mdstat as /dev/md0: active(auto-read-only) whereas if it is truely readonly, it appears as /dev/md0: active (read-only) The difference being a space. One program known to parse this file expects the space and gets badly confused. It will be fixed, but it would be best if what the kernel generates is more consistent too. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-03-04md: lock access to rdev attributes properlyNeilBrown
When we access attributes of an rdev (component device on an md array) through sysfs, we really need to lock the array against concurrent changes. We currently do that when we change an attribute, but not when we read an attribute. We need to lock when reading as well else rdev->mddev could become NULL while we are accessing it. So add appropriate locking (mddev_lock) to rdev_attr_show. rdev_size_store requires some extra care as well as it needs to unlock the mddev while scanning other mddevs for overlapping regions. We currently assume that rdev->mddev will still be unchanged after the scan, but that cannot be certain. So take a copy of rdev->mddev for use at the end of the function. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-03-04md: make sure a reshape is started when device switches to read-writeNeilBrown
A resync/reshape/recovery thread will refuse to progress when the array is marked read-only. So whenever it mark it not read-only, it is important to wake up thread resync thread. There is one place we didn't do this. The problem manifests if the start_ro module parameters is set, and a raid5 array that is in the middle of a reshape (restripe) is started. The array will initially be semi-read-only (meaning it acts like it is readonly until the first write). So the reshape will not proceed. On the first write, the array will become read-write, but the reshape will not be started, and there is no event which will ever restart that thread. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-03-04md: clean up irregularity with raid autodetectNeilBrown
When a raid1 array is stopped, all components currently get added to the list for auto-detection. However we should really only add components that were found by autodetection in the first place. So add a flag to record that information, and use it. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-03-04md: guard against possible bad array geometry in v1 metadataNeilBrown
Make sure the data doesn't start before the end of the superblock when the superblock is at the start of the device. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-02-14d_path: Make seq_path() use a struct path argumentJan Blunck
seq_path() is always called with a dentry and a vfsmount from a struct path. Make seq_path() take it directly as an argument. Signed-off-by: Jan Blunck <jblunck@suse.de> Cc: Christoph Hellwig <hch@lst.de> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: "J. Bruce Fields" <bfields@fieldses.org> Cc: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-02-06md: change ITERATE_RDEV_GENERIC to rdev_for_each_list, and remove ↵NeilBrown
ITERATE_RDEV_PENDING. Finish ITERATE_ to for_each conversion. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-02-06md: change ITERATE_RDEV to rdev_for_eachNeilBrown
As this is more in line with common practice in the kernel. Also swap the args around to be more like list_for_each. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-02-06md: change INTERATE_MDDEV to for_each_mddevNeilBrown
As this is more consistent with kernel style. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-02-06md: change a few 'int' to 'size_t' in mdNeilBrown
As suggested by Andrew Morton. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-02-06md: fix use-after-free bug when dropping an rdev from an md arrayNeilBrown
Due to possible deadlock issues we need to use a schedule work to kobject_del an 'rdev' object from a different thread. A recent change means that kobject_add no longer gets a refernce, and kobject_del doesn't put a reference. Consequently, we need to explicitly hold a reference to ensure that the last reference isn't dropped before the scheduled work get a chance to call kobject_del. Also, rename delayed_delete to md_delayed_delete to that it is more obvious in a stack trace which code is to blame. Cc: Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-02-06md: allow an md array to appear with 0 drives if it has external metadataNeilBrown
Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-02-06md: lock address when changing attributes of component devicesNeilBrown
Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-02-06md: allow devices to be shared between md arraysNeilBrown
Currently, a given device is "claimed" by a particular array so that it cannot be used by other arrays. This is not ideal for DDF and other metadata schemes which have their own partitioning concept. So for externally managed metadata, just claim the device for md in general, require that "offset" and "size" are set properly for each device, and make sure that if a device is included in different arrays then the active sections do not overlap. This involves adding another flag to the rdev which makes it awkward to set "->flags = 0" to clear certain flags. So now clear flags explicitly by name when we want to clear things. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-02-06md: set and test the ->persistent flag for md devices more consistentlyNeilBrown
If you try to start an array for which the number of raid disks is listed as zero, md will currently try to read metadata off any devices that have been given. This was done because the value of raid_disks is used to signal whether array details have been provided by userspace (raid_disks > 0) or must be read from the devices (raid_disks == 0). However for an array without persistent metadata (or with externally managed metadata) this is the wrong thing to do. So we add a test in do_md_run to give an error if raid_disks is zero for non-persistent arrays. This requires that mddev->persistent is set corrently at this point, which it currently isn't for in-kernel autodetected arrays. So set ->persistent for autodetect arrays, and remove the settign in super_*_validate which is now redundant. Also clear ->persistent when stopping an array so it is consistently zero when starting an array. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-02-06md: allow a maximum extent to be set for resyncingNeilBrown
This allows userspace to control resync/reshape progress and synchronise it with other activities, such as shared access in a SAN, or backing up critical sections during a tricky reshape. Writing a number of sectors (which must be a multiple of the chunk size if such is meaningful) causes a resync to pause when it gets to that point. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-02-06md: give userspace control over removing failed devices when external ↵NeilBrown
metdata in use When a device fails, we must not allow an further writes to the array until the device failure has been recorded in array metadata. When metadata is managed externally, this requires some synchronisation... Allow/require userspace to explicitly remove failed devices from active service in the array by writing 'none' to the 'slot' attribute. If this reduces the number of failed devices to 0, the write block will automatically be lowered. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-02-06md: support 'external' metadata for md arraysNeilBrown
- Add a state flag 'external' to indicate that the metadata is managed externally (by user-space) so important changes need to be left of user-space to handle. Alternates are non-persistant ('none') where there is no stable metadata - after the array is stopped there is no record of it's status - and internal which can be version 0.90 or version 1.x These are selected by writing to the 'metadata' attribute. - move the updating of superblocks (sync_sbs) to after we have checked if there are any superblocks or not. - New array state 'write_pending'. This means that the metadata records the array as 'clean', but a write has been requested, so the metadata has to be updated to record a 'dirty' array before the write can continue. This change is reported to md by writing 'active' to the array_state attribute. - tidy up marking of sb_dirty: - don't set sb_dirty when resync finishes as md_check_recovery calls md_update_sb when the sync thread finishes anyway. - Don't set sb_dirty in multipath_run as the array might not be dirty. - don't mark superblock dirty when switching to 'clean' if there is no internal superblock (if external, userspace can choose to update the superblock whenever it chooses to). Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-01-24Kobject: convert drivers/* from kobject_unregister() to kobject_put()Greg Kroah-Hartman
There is no need for kobject_unregister() anymore, thanks to Kay's kobject cleanup changes, so replace all instances of it with kobject_put(). Cc: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2008-01-24Kobject: rename kobject_init_ng() to kobject_init()Greg Kroah-Hartman
Now that the old kobject_init() function is gone, rename kobject_init_ng() to kobject_init() to clean up the namespace. Cc: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2008-01-24Kobject: rename kobject_add_ng() to kobject_add()Greg Kroah-Hartman
Now that the old kobject_add() function is gone, rename kobject_add_ng() to kobject_add() to clean up the namespace. Cc: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2008-01-24Kobject: convert drivers/md/md.c to use kobject_init/add_ng()Greg Kroah-Hartman
This converts the code to use the new kobject functions, cleaning up the logic in doing so. Cc: Neil Brown <neilb@suse.de> Cc: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>