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>
one_comp->obj.id = oid;
exofs_make_credential(one_comp->cred, &one_comp->obj);
one_comp->obj.id = oid;
exofs_make_credential(one_comp->cred, &one_comp->obj);
oc->numdevs = sbi->layout.group_width * sbi->layout.mirrors_p1 *
sbi->layout.group_count;
oc->single_comp = EC_SINGLE_COMP;
oc->numdevs = sbi->layout.group_width * sbi->layout.mirrors_p1 *
sbi->layout.group_count;
oc->single_comp = EC_SINGLE_COMP;
static struct osd_dev *_ios_od(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);
}
return ore_comp_dev(ios->oc, index);
}
};
struct ore_components {
};
struct ore_components {
+ unsigned first_dev; /* First logical device no */
unsigned numdevs; /* Num of devices in array */
/* If @single_comp == EC_SINGLE_COMP, @comps points to a single
* component. else there are @numdevs components
unsigned numdevs; /* Num of devices in array */
/* If @single_comp == EC_SINGLE_COMP, @comps points to a single
* component. else there are @numdevs components
static inline struct osd_dev *ore_comp_dev(
const struct ore_components *oc, unsigned i)
{
static inline struct osd_dev *ore_comp_dev(
const struct ore_components *oc, unsigned i)
{
- BUG_ON(oc->numdevs <= i);
- return oc->ods[i]->od;
+ BUG_ON((i < oc->first_dev) || (oc->first_dev + oc->numdevs <= i));
+ return oc->ods[i - oc->first_dev]->od;
}
static inline void ore_comp_set_dev(
struct ore_components *oc, unsigned i, struct osd_dev *od)
{
}
static inline void ore_comp_set_dev(
struct ore_components *oc, unsigned i, struct osd_dev *od)
{
+ oc->ods[i - oc->first_dev]->od = od;
}
struct ore_striping_info {
}
struct ore_striping_info {