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authorBoaz Harrosh <bharrosh@panasas.com>2011-09-28 11:55:51 +0300
committerBoaz Harrosh <bharrosh@panasas.com>2011-10-14 18:52:50 +0200
commitb916c5cd4d895a27b47a652648958f73e4f23ac6 (patch)
tree9fe6e59edd44119c79a18b9df0b02a0c4dacb6d1 /include
parentd866d875f68fdeae63df334d291fe138dc636d96 (diff)
downloadlinux-b916c5cd4d895a27b47a652648958f73e4f23ac6.tar.bz2
ore: Only IO one group at a time (API change)
Usually a single IO is confined to one group of devices (group_width) and at the boundary of a raid group it can spill into a second group. Current code would allocate a full device_table size array at each io_state so it can comply to requests that span two groups. Needless to say that is very wasteful, specially when device_table count can get very large (hundreds even thousands), while a group_width is usually 8 or 10. * Change ore API to trim on IO that spans two raid groups. The user passes offset+length to ore_get_rw_state, the ore might trim on that length if spanning a group boundary. The user must check ios->length or ios->nrpages to see how much IO will be preformed. It is the responsibility of the user to re-issue the reminder of the IO. * Modify exofs To copy spilled pages on to the next IO. This means one last kick is needed after all coalescing of pages is done. Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
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