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authorBoaz Harrosh <bharrosh@panasas.com>2011-05-22 18:52:19 +0200
committerBoaz Harrosh <bharrosh@panasas.com>2011-05-29 19:54:15 +0200
commit04f83450388e87d86b387cf4a27b81eb7e69de7d (patch)
tree99c10d6a995ed1e7b872abb0127fc38d6bef9982 /fs/direct-io.c
parentpnfs: support for non-rpc layout drivers (diff)
downloadlinux-04f83450388e87d86b387cf4a27b81eb7e69de7d.tar.xz
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pnfs-obj: osd raid engine read/write implementation
With the use of the in-kernel osd library. Implement read/write of data from/to osd-objects according to information specified in the objects-layout. Support for stripping over mirrors with a received stripe_unit. There are however a few constrains which are not supported: 1. Stripe Unit must be a multiple of PAGE_SIZE 2. stripe length (stripe_unit * number_of_stripes) can not be bigger then 32bit. Also support raid-groups and partial-layout. Partial-layout is when not all the groups are received on the line, addressing only a partial range of the file. TODO: Only raid0! raid 4/5/6 support will come at later stage A none supported layout will send IO through the MDS [Important fallout from the last rebase] Signed-off-by: Boaz Harrosh <bharrosh@panasas.com> [gfp_flags] Signed-off-by: Benny Halevy <bhalevy@panasas.com>
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