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| author | Boaz Harrosh <bharrosh@panasas.com> | 2011-09-28 11:04:23 +0200 |
|---|---|---|
| committer | Boaz Harrosh <bharrosh@panasas.com> | 2011-10-14 18:54:41 +0200 |
| commit | 3bd9856857339d7ee8c4ad50030583f1b9415c39 (patch) | |
| tree | fa5d950b9beffa2a10bc698d452ae50b8e195d5e /fs/partitions | |
| parent | ore: Support for short read/writes (diff) | |
| download | linux-3bd9856857339d7ee8c4ad50030583f1b9415c39.tar.xz linux-3bd9856857339d7ee8c4ad50030583f1b9415c39.zip | |
ore: Support for partial component table
Users like the objlayout-driver would like to only pass
a partial device table that covers the IO in question.
For example exofs divides the file into raid-group-sized
chunks and only serves group_width number of devices at
a time.
The partiality is communicated by setting
ore_componets->first_dev and the array covers all logical
devices from oc->first_dev upto (oc->first_dev + oc->numdevs)
The ore_comp_dev() API receives a logical device index
and returns the actual present device in the table.
An out-of-range dev_index will BUG.
Logical device index is the theoretical device index as if
all the devices of a file are present. .i.e:
total_devs = group_width * mirror_p1 * group_count
0 <= dev_index < total_devs
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Diffstat (limited to 'fs/partitions')
0 files changed, 0 insertions, 0 deletions