linux/drivers/md/raid0.c, branch v2.6.30.1

md: 'array_size' sysfs attribute

2009-03-31T04:00:31Z

Allow userspace to set the size of the array according to the following semantics: 1/ size must be <= to the size returned by mddev->pers->size(mddev, 0, 0) a) If size is set before the array is running, do_md_run will fail if size is greater than the default size b) A reshape attempt that reduces the default size to less than the set array size should be blocked 2/ once userspace sets the size the kernel will not change it 3/ writing 'default' to this attribute returns control of the size to the kernel and reverts to the size reported by the personality Also, convert locations that need to know the default size from directly reading ->array_sectors to _size. Resync/reshape operations always follow the default size. Finally, fixup other locations that read a number of 1k-blocks from userspace to use strict_blocks_to_sectors() which checks for unsigned long long to sector_t overflow and blocks to sectors overflow. Reviewed-by: Andre Noll Signed-off-by: Dan Williams

md: centralize ->array_sectors modifications

2009-03-31T03:59:03Z

Get personalities out of the business of directly modifying ->array_sectors. Lays groundwork to introduce policy on when ->array_sectors can be modified. Reviewed-by: Andre Noll Signed-off-by: Dan Williams

md: add 'size' as a personality method

2009-03-31T03:57:49Z

In preparation for giving userspace control over ->array_sectors we need to be able to retrieve the 'default' size, and the 'anticipated' size when a reshape is requested. For personalities that do not reshape emit a warning if anything but the default size is requested. In the raid5 case we need to update ->previous_raid_disks to make the new 'default' size available. Reviewed-by: Andre Noll Signed-off-by: Dan Williams

md: Represent raid device size in sectors.

2009-03-31T03:33:13Z

This patch renames the "size" field of struct mdk_rdev_s to "sectors" and changes this field to store sectors instead of blocks. All users of this field, linear.c, raid0.c and md.c, are fixed up accordingly which gets rid of many multiplications and divisions. Signed-off-by: Andre Noll Signed-off-by: NeilBrown

md: move md_k.h from include/linux/raid/ to drivers/md/

2009-03-31T03:33:13Z

It really is nicer to keep related code together.. Signed-off-by: NeilBrown

md: move lots of #include lines out of .h files and into .c

2009-03-31T03:33:13Z

This makes the includes more explicit, and is preparation for moving md_k.h to drivers/md/md.h Remove include/raid/md.h as its only remaining use was to #include other files. Signed-off-by: NeilBrown

md: move headers out of include/linux/raid/

2009-03-31T03:27:03Z

Move the headers with the local structures for the disciplines and bitmap.h into drivers/md/ so that they are more easily grepable for hacking and not far away. md.h is left where it is for now as there are some uses from the outside. Signed-off-by: Christoph Hellwig Signed-off-by: NeilBrown

md: use list_for_each_entry macro directly

2009-01-08T21:31:08Z

The rdev_for_each macro defined in is identical to list_for_each_entry_safe, from , it should be defined to use list_for_each_entry_safe, instead of reinventing the wheel. But some calls to each_entry_safe don't really need a safe version, just a direct list_for_each_entry is enough, this could save a temp variable (tmp) in every function that used rdev_for_each. In this patch, most rdev_for_each loops are replaced by list_for_each_entry, totally save many tmp vars; and only in the other situations that will call list_del to delete an entry, the safe version is used. Signed-off-by: Cheng Renquan Signed-off-by: NeilBrown

md: raid0: make hash_spacing and preshift sector-based.

2009-01-08T21:31:08Z

This patch renames the hash_spacing and preshift members of struct raid0_private_data to spacing and sector_shift respectively and changes the semantics as follows: We always have spacing = 2 * hash_spacing. In case sizeof(sector_t) > sizeof(u32) we also have sector_shift = preshift + 1 while sector_shift = preshift = 0 otherwise. Note that the values of nb_zone and zone are unaffected by these changes because in the sector_div() preceeding the assignement of these two variables both arguments double. Signed-off-by: Andre Noll Signed-off-by: NeilBrown

md: raid0: Represent the size of strip zones in sectors.

2009-01-08T21:31:07Z

This completes the block -> sector conversion of struct strip_zone. Signed-off-by: Andre Noll Signed-off-by: NeilBrown