diff options
| author | Boaz Harrosh <bharrosh@panasas.com> | 2011-09-28 14:43:09 +0300 |
|---|---|---|
| committer | Boaz Harrosh <bharrosh@panasas.com> | 2011-10-04 12:13:59 +0200 |
| commit | d866d875f68fdeae63df334d291fe138dc636d96 (patch) | |
| tree | 9606674db2311ab869640526ef245aaa7fbf4ea8 /fs/exofs/exofs.h | |
| parent | eb507bc18969f63b8968034144fd69706c492516 (diff) | |
| download | linux-d866d875f68fdeae63df334d291fe138dc636d96.tar.bz2 | |
ore/exofs: Change the type of the devices array (API change)
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>
Diffstat (limited to 'fs/exofs/exofs.h')
| -rw-r--r-- | fs/exofs/exofs.h | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/fs/exofs/exofs.h b/fs/exofs/exofs.h index 3b2e0478f363..006fd6f33571 100644 --- a/fs/exofs/exofs.h +++ b/fs/exofs/exofs.h @@ -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 |