From 3bd9856857339d7ee8c4ad50030583f1b9415c39 Mon Sep 17 00:00:00 2001 From: Boaz Harrosh Date: Wed, 28 Sep 2011 12:04:23 +0300 Subject: 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 --- fs/exofs/exofs.h | 1 + fs/exofs/ore.c | 4 ++++ 2 files changed, 5 insertions(+) (limited to 'fs/exofs') diff --git a/fs/exofs/exofs.h b/fs/exofs/exofs.h index 006fd6f33571..51f4b4c40f09 100644 --- a/fs/exofs/exofs.h +++ b/fs/exofs/exofs.h @@ -217,6 +217,7 @@ static inline void exofs_init_comps(struct ore_components *oc, one_comp->obj.id = oid; exofs_make_credential(one_comp->cred, &one_comp->obj); + oc->first_dev = 0; oc->numdevs = sbi->layout.group_width * sbi->layout.mirrors_p1 * sbi->layout.group_count; oc->single_comp = EC_SINGLE_COMP; diff --git a/fs/exofs/ore.c b/fs/exofs/ore.c index 8354fe061d1c..f1b718028a1f 100644 --- a/fs/exofs/ore.c +++ b/fs/exofs/ore.c @@ -62,6 +62,10 @@ static struct osd_obj_id *_ios_obj(struct ore_io_state *ios, unsigned index) static struct osd_dev *_ios_od(struct ore_io_state *ios, unsigned index) { + ORE_DBGMSG2("oc->first_dev=%d oc->numdevs=%d i=%d oc->ods=%p\n", + ios->oc->first_dev, ios->oc->numdevs, index, + ios->oc->ods); + return ore_comp_dev(ios->oc, index); } -- cgit v1.2.3