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exofs: Remove unused data_map member from exofs_sb_info

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The struct pnfs_osd_data_map data_map member of exofs_sb_info was
never used after mount. In fact all it's members were duplicated
by the ore_layout structure. So just remove the duplicated information.

Also removed some stupid, but perfectly supported, restrictions on
layout parameters. The case where num_devices is not divisible by
mirror_count+1 is perfectly fine since the rotating device view
will eventually use all the devices it can get.

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: Benny Halevy <bhalevy@tonian.com>
This commit is contained in:
Boaz Harrosh 2011-08-10 14:15:02 -07:00
parent 5bf696dad4
commit 8d2d83a835
3 changed files with 24 additions and 38 deletions
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3
fs/exofs/exofs.h
View File

@ -66,9 +66,6 @@ struct exofs_sb_info {
u32 s_next_generation; /* next gen # to use */
atomic_t s_curr_pending; /* number of pending commands */
struct pnfs_osd_data_map data_map; /* Default raid to use
* FIXME: Needed ?
*/
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 */

57
fs/exofs/super.c
View File

@ -481,64 +481,51 @@ static int _read_and_match_data_map(struct exofs_sb_info *sbi, unsigned numdevs,
{
u64 stripe_length;
sbi->data_map.odm_num_comps =
le32_to_cpu(dt->dt_data_map.cb_num_comps);
sbi->data_map.odm_stripe_unit =
sbi->layout.stripe_unit =
le64_to_cpu(dt->dt_data_map.cb_stripe_unit);
sbi->data_map.odm_group_width =
sbi->layout.group_width =
le32_to_cpu(dt->dt_data_map.cb_group_width);
sbi->data_map.odm_group_depth =
sbi->layout.group_depth =
le32_to_cpu(dt->dt_data_map.cb_group_depth);
sbi->data_map.odm_mirror_cnt =
le32_to_cpu(dt->dt_data_map.cb_mirror_cnt);
sbi->data_map.odm_raid_algorithm =
sbi->layout.mirrors_p1 =
le32_to_cpu(dt->dt_data_map.cb_mirror_cnt) + 1;
sbi->layout.raid_algorithm =
le32_to_cpu(dt->dt_data_map.cb_raid_algorithm);
/* FIXME: Only raid0 for now. if not so, do not mount */
if (sbi->data_map.odm_num_comps != numdevs) {
EXOFS_ERR("odm_num_comps(%u) != numdevs(%u)\n",
sbi->data_map.odm_num_comps, numdevs);
return -EINVAL;
}
if (sbi->data_map.odm_raid_algorithm != PNFS_OSD_RAID_0) {
if (sbi->layout.raid_algorithm != PNFS_OSD_RAID_0) {
EXOFS_ERR("Only RAID_0 for now\n");
return -EINVAL;
}
if (0 != (numdevs % (sbi->data_map.odm_mirror_cnt + 1))) {
EXOFS_ERR("Data Map wrong, numdevs=%d mirrors=%d\n",
numdevs, sbi->data_map.odm_mirror_cnt);
if (numdevs < (sbi->layout.group_width * sbi->layout.mirrors_p1)) {
EXOFS_ERR("Data Map wrong, "
"numdevs=%d < group_width=%d * mirrors=%d\n",
numdevs, sbi->layout.group_width,
sbi->layout.mirrors_p1);
return -EINVAL;
}
if (0 != (sbi->data_map.odm_stripe_unit & ~PAGE_MASK)) {
if (0 != (sbi->layout.stripe_unit & ~PAGE_MASK)) {
EXOFS_ERR("Stripe Unit(0x%llx)"
" must be Multples of PAGE_SIZE(0x%lx)\n",
_LLU(sbi->data_map.odm_stripe_unit), PAGE_SIZE);
_LLU(sbi->layout.stripe_unit), PAGE_SIZE);
return -EINVAL;
}
sbi->layout.stripe_unit = sbi->data_map.odm_stripe_unit;
sbi->layout.mirrors_p1 = sbi->data_map.odm_mirror_cnt + 1;
if (sbi->data_map.odm_group_width) {
sbi->layout.group_width = sbi->data_map.odm_group_width;
sbi->layout.group_depth = sbi->data_map.odm_group_depth;
if (sbi->layout.group_width) {
if (!sbi->layout.group_depth) {
EXOFS_ERR("group_depth == 0 && group_width != 0\n");
return -EINVAL;
}
sbi->layout.group_count = sbi->data_map.odm_num_comps /
sbi->layout.mirrors_p1 /
sbi->data_map.odm_group_width;
sbi->layout.group_count = numdevs / sbi->layout.mirrors_p1 /
sbi->layout.group_width;
} else {
if (sbi->data_map.odm_group_depth) {
if (sbi->layout.group_depth) {
printk(KERN_NOTICE "Warning: group_depth ignored "
"group_width == 0 && group_depth == %d\n",
sbi->data_map.odm_group_depth);
sbi->data_map.odm_group_depth = 0;
"group_width == 0 && group_depth == %lld\n",
_LLU(sbi->layout.group_depth));
}
sbi->layout.group_width = sbi->data_map.odm_num_comps /
sbi->layout.mirrors_p1;
sbi->layout.group_width = numdevs / sbi->layout.mirrors_p1;
sbi->layout.group_depth = -1;
sbi->layout.group_count = 1;
}
@ -558,7 +545,7 @@ static int _read_and_match_data_map(struct exofs_sb_info *sbi, unsigned numdevs,
sbi->layout.group_width,
_LLU(sbi->layout.group_depth),
sbi->layout.mirrors_p1,
sbi->data_map.odm_raid_algorithm);
sbi->layout.raid_algorithm);
return 0;
}

2
include/scsi/osd_ore.h
View File

@ -34,6 +34,8 @@ struct ore_comp {
struct ore_layout {
/* Our way of looking at the data_map */
enum pnfs_osd_raid_algorithm4
raid_algorithm;
unsigned stripe_unit;
unsigned mirrors_p1;