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ore/exofs: Change the type of the devices array (API change)

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In the pNFS obj-LD the device table at the layout level needs
to point to a device_cache node, where it is possible and likely
that many layouts will point to the same device-nodes.

In Exofs we have a more orderly structure where we have a single
array of devices that repeats twice for a round-robin view of the
device table

This patch moves to a model that can be used by the pNFS obj-LD
where struct ore_components holds an array of ore_dev-pointers.
(ore_dev is newly defined and contains a struct osd_dev *od
 member)

Each pointer in the array of pointers will point to a bigger
user-defined dev_struct. That can be accessed by use of the
container_of macro.

In Exofs an __alloc_dev_table() function allocates the
ore_dev-pointers array as well as an exofs_dev array, in one
allocation and does the addresses dance to set everything pointing
correctly. It still keeps the double allocation trick for the
inodes round-robin view of the table.

The device table is always allocated dynamically, also for the
single device case. So it is unconditionally freed at umount.

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
This commit is contained in:
Boaz Harrosh
2011-09-28 14:43:09 +03:00
parent eb507bc189
commit d866d875f6
4 changed files with 94 additions and 43 deletions
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include/scsi/osd_ore.h
+25 -1
View File
@@ -44,6 +44,10 @@ struct ore_layout {
unsigned group_count;
};
struct ore_dev {
struct osd_dev *od;
};
struct ore_components {
unsigned numdevs; /* Num of devices in array */
/* If @single_comp == EC_SINGLE_COMP, @comps points to a single
@@ -53,9 +57,29 @@ struct ore_components {
EC_SINGLE_COMP = 0, EC_MULTPLE_COMPS = 0xffffffff
} single_comp;
struct ore_comp *comps;
struct osd_dev **ods; /* osd_dev array */
/* Array of pointers to ore_dev-* . User will usually have these pointed
* too a bigger struct which contain an "ore_dev ored" member and use
* container_of(oc->ods[i], struct foo_dev, ored) to access the bigger
* structure.
*/
struct ore_dev **ods;
};
/* ore_comp_dev Recievies a logical device index */
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;
}
static inline void ore_comp_set_dev(
struct ore_components *oc, unsigned i, struct osd_dev *od)
{
oc->ods[i]->od = od;
}
struct ore_striping_info {
u64 obj_offset;
u64 group_length;