- 03 Oct, 2006 40 commits
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Paul Clements authored
Signed-off-by:
Neil Brown <neilb@suse.de> Signed-off-by:
Andrew Morton <akpm@osdl.org> Signed-off-by:
Linus Torvalds <torvalds@osdl.org>
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Paul Clements authored
find_first_set doesn't find the least-significant bit on bigendian machines, so it is really wrong to use it. ffs is closer, but takes an 'int' and we have a 'unsigned long'. So use ffz(~X) to convert a chunksize into a chunkshift. Signed-off-by:
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NeilBrown authored
I have had enough success reports not to believe that this is safe for 2.6.19. Signed-off-by:
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NeilBrown authored
Once upon a time we needed to fixed limit to the number of md devices, probably because we preallocated some array. This need no longer exists, but we still have an arbitrary limit. So remove MAX_MD_DEVS and allow as many devices as we can fit into the 'minor' part of a device number. Also remove some useless noise at init time (which reports MAX_MD_DEVS) and remove MD_THREAD_NAME_MAX which hasn't been used for a while. Signed-off-by:
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NeilBrown authored
md.txt has two sections describing the 'level' sysfs attribute, and some of the text is out-of-date. So make just one section, and make it right. Cc: Christian Kujau <evil@g-house.de> Signed-off-by:
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NeilBrown authored
It is possible to request a 'check' of an md/raid array where the whole array is read and consistancies are reported. This uses the same mechanisms as 'resync' and so reports in the kernel logs that a resync is being started. This understandably confuses/worries people. Also the text in /proc/mdstat suggests a 'resync' is happen when it is just a check. This patch changes those messages to be more specific about what is happening. Signed-off-by:
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NeilBrown authored
This is very different from other raid levels and all requests go through a 'stripe cache', and it has congestion management already. Signed-off-by:
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NeilBrown authored
raid1, raid10 and multipath don't report their 'congested' status through bdi_*_congested, but should. This patch adds the appropriate functions which just check the 'congested' status of all active members (with appropriate locking). raid1 read_balance should be modified to prefer devices where bdi_read_congested returns false. Then we could use the '&' branch rather than the '|' branch. However that should would need some benchmarking first to make sure it is actually a good idea. Signed-off-by:
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NeilBrown authored
Each backing_dev needs to be able to report whether it is congested, either by modulating BDI_*_congested in ->state, or by defining a ->congested_fn. md/raid did neither of these. This patch add a congested_fn which simply checks all component devices to see if they are congested. Signed-off-by:
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NeilBrown authored
The error handling routines don't use proper locking, and so two concurrent errors could trigger a problem. So: - use test-and-set and test-and-clear to synchonise the In_sync bits with the ->degraded count - use the spinlock to protect updates to the degraded count (could use an atomic_t but that would be a bigger change in code, and isn't really justified) - remove un-necessary locking in raid5 Signed-off-by: -
NeilBrown authored
It is equivalent to conf->raid_disks - conf->mddev->degraded. Signed-off-by:
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NeilBrown authored
raid1d has toooo many nested block, so take the fix_read_error functionality out into a separate function. Signed-off-by:
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Coywolf Qi Hunt authored
Signed-off-by:
Coywolf Qi Hunt <qiyong@freeforge.net> Signed-off-by:
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Paul Clements authored
Add a new sysfs interface that allows the bitmap of an array to be dirtied. The interface is write-only, and is used as follows: echo "1000" > /sys/block/md2/md/bitmap (dirty the bit for chunk 1000 [offset 0] in the in-memory and on-disk bitmaps of array md2) echo "1000-2000" > /sys/block/md1/md/bitmap (dirty the bits for chunks 1000-2000 in md1's bitmap) This is useful, for example, in cluster environments where you may need to combine two disjoint bitmaps into one (following a server failure, after a secondary server has taken over the array). By combining the bitmaps on the two servers, a full resync can be avoided (This was discussed on the list back on March 18, 2005, "[PATCH 1/2] md bitmap bug fixes" thread). Signed-off-by:
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NeilBrown authored
It isn't needed as mddev->degraded contains equivalent info. Signed-off-by:
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NeilBrown authored
They are not needed. conf->failed_disks is the same as mddev->degraded and conf->working_disks is conf->raid_disks - mddev->degraded. Signed-off-by:
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NeilBrown authored
Instead of magic numbers (0,1,2,3) in sb_dirty, we have some flags instead: MD_CHANGE_DEVS Some device state has changed requiring superblock update on all devices. MD_CHANGE_CLEAN The array has transitions from 'clean' to 'dirty' or back, requiring a superblock update on active devices, but possibly not on spares MD_CHANGE_PENDING A superblock update is underway. We wait for an update to complete by waiting for all flags to be clear. A flag can be set at any time, even during an update, without risk that the change will be lost. Stop exporting md_update_sb - isn't needed. Signed-off-by:
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NeilBrown authored
raid10d has toooo many nested block, so take the fix_read_error functionality out into a separate function. Signed-off-by:
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NeilBrown authored
Signed-off-by:
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Adrian Bunk authored
This patch contains the scheduled removal of the START_ARRAY ioctl for md. Signed-off-by:
Adrian Bunk <bunk@stusta.de> Signed-off-by:
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Bryn Reeves authored
This patch adds support for a per-target dm_flush_fn method. This is needed to allow dm-loop to invalidate page cache mappings in response to BLKFLSBUF ioctl commands. Signed-off-by:
Bryn Reeves <breeves@redhat.com> Signed-off-by:
Alasdair G Kergon <agk@redhat.com> Signed-off-by:
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Bryn Reeves authored
Separate the setting of device I/O limits from dm_get_device(). dm-loop will use this. Signed-off-by:
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Stefan Bader authored
I found a problem within device-mapper that occurs in low-mem situations. It was found using a mirror target but I think in theory it would hit any setup that stacks device-mapper devices (like LVM on top of multipath). Since device-mapper core uses the common fs_bioset in clone_bio(), and a private, but still global, bio_set in split_bvec() it is possible that the filesystem and the first level target successfully get bios but the lower level target doesn't because there is no more memory and the pool was drained by upper layers. So the remapping will be stuck forever. To solve this device-mapper core needs to use a private bio_set for each device. Signed-off-by:
Stefan Bader <Stefan.Bader@de.ibm.com> Signed-off-by:
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Milan Broz authored
In the low memory situation dm-crypt needs to use a private mempool of bios to avoid blocking. Signed-off-by:
Milan Broz <mbroz@redhat.com> Signed-off-by:
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Milan Broz authored
This patch is designed to help dm-crypt comply with the new constraints imposed by the following patch in -mm: md-dm-reduce-stack-usage-with-stacked-block-devices.patch Under low memory the existing implementation relies upon waiting for I/O submitted recursively to generic_make_request() completing before the original generic_make_request() call can return. This patch moves the I/O submission to a workqueue so the original generic_make_request() can return immediately. Signed-off-by:
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Milan Broz authored
Restructure the dm-crypt write processing in preparation for workqueue changes in the next patches. Signed-off-by:
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Milan Broz authored
Restructure part of the dm-crypt code in preparation for workqueue changes. Use 'base_bio' or 'clone' variable names consistently throughout. No functional changes are included in this patch. Signed-off-by:
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Milan Broz authored
Add the facility to wipe the encryption key from memory (for example while a laptop is suspended) and reinstate it later (when the laptop gets resumed). Signed-off-by:
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Milan Broz authored
This patch adds a target preresume hook. It is called before the targets are resumed and if it returns an error the resume gets cancelled. The crypt target will use this to indicate that it is unable to process I/O because no encryption key has been supplied. Signed-off-by:
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Bryn Reeves authored
Add CONFIG_DM_DEBUG and DMDEBUG() macro. Signed-off-by:
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Hannes Reinecke authored
Device-mapper devices are not accessible until a 'resume' ioctl has been issued. For userspace to find out when this happens we need to generate an uevent for udev to take appropriate action. As discussed at OLS we should send 'change' events for 'resume'. We can think of no useful purpose served by also having 'suspend' events. Signed-off-by:
Hannes Reinecke <hare@suse.de> Signed-off-by:
Kay Sievers <kay.sievers@vrfy.org> Signed-off-by:
Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by:
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Micha³ Miros³aw authored
Use kzalloc() instead of kmalloc() + memset(). Signed-off-by:
Micha³ Miros³aw <mirq-linux@rere.qmqm.pl> Signed-off-by:
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Micha³ Miros³aw authored
After initialising m->ti, there's no need to pass it in subsequent calls to static functions used for parsing parameters. Signed-off-by:
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Jonathan Brassow authored
Remove trailing space from 'dmsetup table' output. Signed-off-by:
Jonathan Brassow <jbrassow@redhat.com> Signed-off-by:
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Alasdair G Kergon authored
If a snapshot became invalid while there are outstanding pending_exceptions, when pending_complete() processes each one it forgets to remove the corresponding exception from its exception table before freeing it. Fix this by moving the 'out:' label up one statement so that remove_exception() is always called. Then __invalidate_exception() no longer needs to call it and its 'pe' argument become superfluous. Signed-off-by:
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Alasdair G Kergon authored
Rename sibling_count to ref_count and introduce get and put functions. Signed-off-by:
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Alasdair G Kergon authored
Add a workqueue so that I/O can be queued up to be flushed from a separate thread (e.g. if local interrupts are disabled). A new per-snapshot spinlock pe_lock is introduced to protect queued_bios. Signed-off-by:
Mark McLoughlin <markmc@redhat.com> Signed-off-by:
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Alasdair G Kergon authored
This patch rearranges the pending_complete() code so that the functional changes in subsequent patches are clearer. By consolidating the error and the non-error paths, we can move error_snapshot_bios() and __flush_bios() in line. Signed-off-by:
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Alasdair G Kergon authored
This patch rearranges the snapshot_map code so that the functional changes in subsequent patches are clearer. The only functional change is to replace the existing read lock with a write lock which the next patch needs. Signed-off-by:
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Mark McLoughlin authored
When suspending a device-mapper device, dm_suspend() sleeps until all necessary I/O is completed. This state is triggered by a callback from persistent_commit(). But some I/O can still be issued *after* the callback (to prepare the next metadata area for use if the current one is full). This patch delays the callback until after that I/O is complete. Signed-off-by:
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