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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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10
fs/exofs/exofs.h
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@@ -53,6 +53,10 @@
/* u64 has problems with printk this will cast it to unsigned long long */
#define _LLU(x) (unsigned long long)(x)
struct exofs_dev {
struct ore_dev ored;
unsigned did;
};
/*
* our extension to the in-memory superblock
*/
@@ -69,7 +73,6 @@ struct exofs_sb_info {
struct ore_layout layout; /* Default files layout */
struct ore_comp one_comp; /* id & cred of partition id=0*/
struct ore_components oc; /* comps for the partition */
struct osd_dev *_min_one_dev[1]; /* Place holder for one dev */
};
/*
@@ -214,13 +217,14 @@ 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->numdevs = sbi->oc.numdevs;
oc->numdevs = sbi->layout.group_width * sbi->layout.mirrors_p1 *
sbi->layout.group_count;
oc->single_comp = EC_SINGLE_COMP;
oc->comps = one_comp;
/* Round robin device view of the table */
first_dev = (dev_mod * sbi->layout.mirrors_p1) % sbi->oc.numdevs;
oc->ods = sbi->oc.ods + first_dev;
oc->ods = &sbi->oc.ods[first_dev];
}
#endif