linux/Documentation/device-mapper, branch v3.1

dm crypt: optionally support discard requests

2011-08-02T11:32:08Z

Add optional parameter field to dmcrypt table and support "allow_discards" option. Discard requests bypass crypt queue processing. Bio is simple remapped to underlying device. Note that discard will be never enabled by default because of security consequences. It is up to the administrator to enable it for encrypted devices. (Note that userspace cryptsetup does not understand new optional parameters yet. Support for this will come later. Until then, you should use 'dmsetup' to enable and disable this.) Signed-off-by: Milan Broz Signed-off-by: Alasdair G Kergon

dm raid: support metadata devices

2011-08-02T11:32:07Z

Add the ability to parse and use metadata devices to dm-raid. Although not strictly required, without the metadata devices, many features of RAID are unavailable. They are used to store a superblock and bitmap. The role, or position in the array, of each device must be recorded in its superblock. This is to help with fault handling, array reshaping, and sanity checks. RAID 4/5/6 devices must be loaded in a specific order: in this way, the 'array_position' field helps validate the correctness of the mapping when it is loaded. It can be used during reshaping to identify which devices are added/removed. Fault handling is impossible without this field. For example, when a device fails it is recorded in the superblock. If this is a RAID1 device and the offending device is removed from the array, there must be a way during subsequent array assembly to determine that the failed device was the one removed. This is done by correlating the 'array_position' field and the bit-field variable 'failed_devices'. Signed-off-by: Jonathan Brassow Signed-off-by: Alasdair G Kergon

dm raid: add write_mostly parameter

2011-08-02T11:32:07Z

Add the write_mostly parameter to RAID1 dm-raid tables. This allows the user to set the WriteMostly flag on a RAID1 device that should normally be avoided for read I/O. Signed-off-by: Jonathan Brassow Signed-off-by: Alasdair G Kergon

dm raid: add region_size parameter

2011-08-02T11:32:07Z

Allow the user to specify the region_size. Ensures that the supplied value meets md's constraints, viz. the number of regions does not exceed 2^21. Signed-off-by: Jonathan Brassow Signed-off-by: Alasdair G Kergon

dm raid: improve table parameters documentation

2011-08-02T11:32:06Z

Add more information about some dm-raid table parameters and clarify how parameters are printed when 'dmsetup table' is issued. Signed-off-by: Jonathan Brassow Signed-off-by: Alasdair G Kergon

dm flakey: add corrupt_bio_byte feature

2011-08-02T11:32:06Z

Add corrupt_bio_byte feature to simulate corruption by overwriting a byte at a specified position with a specified value during intervals when the device is "down". Signed-off-by: Mike Snitzer Signed-off-by: Alasdair G Kergon

dm flakey: add drop_writes

2011-08-02T11:32:05Z

Add 'drop_writes' option to drop writes silently while the device is 'down'. Reads are not touched. Signed-off-by: Mike Snitzer Signed-off-by: Alasdair G Kergon

Fix common misspellings

2011-03-31T14:26:23Z

Fixes generated by 'codespell' and manually reviewed. Signed-off-by: Lucas De Marchi

dm: add flakey target

2011-03-24T13:54:24Z

This target is the same as the linear target except that it returns I/O errors periodically. It's been found useful in simulating failing devices for testing purposes. I needed a dm target to do some failure testing on btrfs's raid code, and Mike pointed me at this. Signed-off-by: Josef Bacik Signed-off-by: Alasdair G Kergon

Merge branch 'master' into for-next

2011-02-15T09:24:31Z