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ore/exofs: Define new ore_verify_layout 

All users of the ore will need to check if current code
supports the given layout. For example RAID5/6 is not
currently supported.

So move all the checks from exofs/super.c to a new
ore_verify_layout() to be used by ore users.

Note that any new layout should be passed through the
ore_verify_layout() because the ore engine will prepare
and verify some internal members of ore_layout, and
assumes it's called.

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
This commit is contained in:
Boaz Harrosh 2011-09-28 13:18:45 +03:00
parent 3bd9856857
commit 5a51c0c7e9
4 changed files with 80 additions and 53 deletions
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9
fs/exofs/inode.c
View File

@ -37,11 +37,7 @@
#define EXOFS_DBGMSG2(M...) do {} while (0)
enum { BIO_MAX_PAGES_KMALLOC =
(PAGE_SIZE - sizeof(struct bio)) / sizeof(struct bio_vec),
MAX_PAGES_KMALLOC =
PAGE_SIZE / sizeof(struct page *),
};
enum {MAX_PAGES_KMALLOC = PAGE_SIZE / sizeof(struct page *), };
unsigned exofs_max_io_pages(struct ore_layout *layout,
unsigned expected_pages)
@ -49,8 +45,7 @@ unsigned exofs_max_io_pages(struct ore_layout *layout,
unsigned pages = min_t(unsigned, expected_pages, MAX_PAGES_KMALLOC);
/* TODO: easily support bio chaining */
pages = min_t(unsigned, pages,
layout->group_width * BIO_MAX_PAGES_KMALLOC);
pages = min_t(unsigned, pages, layout->max_io_length / PAGE_SIZE);
return pages;
}

67
fs/exofs/ore.c
View File

@ -47,9 +47,76 @@ MODULE_AUTHOR("Boaz Harrosh <bharrosh@panasas.com>");
MODULE_DESCRIPTION("Objects Raid Engine ore.ko");
MODULE_LICENSE("GPL");
/* ore_verify_layout does a couple of things:
* 1. Given a minimum number of needed parameters fixes up the rest of the
* members to be operatonals for the ore. The needed parameters are those
* that are defined by the pnfs-objects layout STD.
* 2. Check to see if the current ore code actually supports these parameters
* for example stripe_unit must be a multple of the system PAGE_SIZE,
* and etc...
* 3. Cache some havily used calculations that will be needed by users.
*/
static void ore_calc_stripe_info(struct ore_layout *layout, u64 file_offset,
struct ore_striping_info *si);
enum { BIO_MAX_PAGES_KMALLOC =
(PAGE_SIZE - sizeof(struct bio)) / sizeof(struct bio_vec),};
int ore_verify_layout(unsigned total_comps, struct ore_layout *layout)
{
u64 stripe_length;
/* FIXME: Only raid0 is supported for now. */
if (layout->raid_algorithm != PNFS_OSD_RAID_0) {
ORE_ERR("Only RAID_0 for now\n");
return -EINVAL;
}
if (0 != (layout->stripe_unit & ~PAGE_MASK)) {
ORE_ERR("Stripe Unit(0x%llx)"
" must be Multples of PAGE_SIZE(0x%lx)\n",
_LLU(layout->stripe_unit), PAGE_SIZE);
return -EINVAL;
}
if (layout->group_width) {
if (!layout->group_depth) {
ORE_ERR("group_depth == 0 && group_width != 0\n");
return -EINVAL;
}
if (total_comps < (layout->group_width * layout->mirrors_p1)) {
ORE_ERR("Data Map wrong, "
"numdevs=%d < group_width=%d * mirrors=%d\n",
total_comps, layout->group_width,
layout->mirrors_p1);
return -EINVAL;
}
layout->group_count = total_comps / layout->mirrors_p1 /
layout->group_width;
} else {
if (layout->group_depth) {
printk(KERN_NOTICE "Warning: group_depth ignored "
"group_width == 0 && group_depth == %lld\n",
_LLU(layout->group_depth));
}
layout->group_width = total_comps / layout->mirrors_p1;
layout->group_depth = -1;
layout->group_count = 1;
}
stripe_length = (u64)layout->group_width * layout->stripe_unit;
if (stripe_length >= (1ULL << 32)) {
ORE_ERR("Stripe_length(0x%llx) >= 32bit is not supported\n",
_LLU(stripe_length));
return -EINVAL;
}
layout->max_io_length =
(BIO_MAX_PAGES_KMALLOC * PAGE_SIZE - layout->stripe_unit) *
layout->group_width;
return 0;
}
EXPORT_SYMBOL(ore_verify_layout);
static u8 *_ios_cred(struct ore_io_state *ios, unsigned index)
{
return ios->oc->comps[index & ios->oc->single_comp].cred;

49
fs/exofs/super.c
View File

@ -480,7 +480,7 @@ static void exofs_put_super(struct super_block *sb)
static int _read_and_match_data_map(struct exofs_sb_info *sbi, unsigned numdevs,
struct exofs_device_table *dt)
{
u64 stripe_length;
int ret;
sbi->layout.stripe_unit =
le64_to_cpu(dt->dt_data_map.cb_stripe_unit);
@ -493,50 +493,7 @@ static int _read_and_match_data_map(struct exofs_sb_info *sbi, unsigned numdevs,
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->layout.raid_algorithm != PNFS_OSD_RAID_0) {
EXOFS_ERR("Only RAID_0 for now\n");
return -EINVAL;
}
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->layout.stripe_unit & ~PAGE_MASK)) {
EXOFS_ERR("Stripe Unit(0x%llx)"
" must be Multples of PAGE_SIZE(0x%lx)\n",
_LLU(sbi->layout.stripe_unit), PAGE_SIZE);
return -EINVAL;
}
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 = numdevs / sbi->layout.mirrors_p1 /
sbi->layout.group_width;
} else {
if (sbi->layout.group_depth) {
printk(KERN_NOTICE "Warning: group_depth ignored "
"group_width == 0 && group_depth == %lld\n",
_LLU(sbi->layout.group_depth));
}
sbi->layout.group_width = numdevs / sbi->layout.mirrors_p1;
sbi->layout.group_depth = -1;
sbi->layout.group_count = 1;
}
stripe_length = (u64)sbi->layout.group_width * sbi->layout.stripe_unit;
if (stripe_length >= (1ULL << 32)) {
EXOFS_ERR("Total Stripe length(0x%llx)"
" >= 32bit is not supported\n", _LLU(stripe_length));
return -EINVAL;
}
ret = ore_verify_layout(numdevs, &sbi->layout);
EXOFS_DBGMSG("exofs: layout: "
"num_comps=%u stripe_unit=0x%x group_width=%u "
@ -547,7 +504,7 @@ static int _read_and_match_data_map(struct exofs_sb_info *sbi, unsigned numdevs,
_LLU(sbi->layout.group_depth),
sbi->layout.mirrors_p1,
sbi->layout.raid_algorithm);
return 0;
return ret;
}
static unsigned __ra_pages(struct ore_layout *layout)

8
include/scsi/osd_ore.h
View File

@ -42,6 +42,13 @@ struct ore_layout {
unsigned group_width;
u64 group_depth;
unsigned group_count;
/* Cached often needed calculations filled in by
* ore_verify_layout
*/
unsigned long max_io_length; /* Max length that should be passed to
* ore_get_rw_state
*/
};
struct ore_dev {
@ -138,6 +145,7 @@ static inline unsigned ore_io_state_size(unsigned numdevs)
}
/* ore.c */
int ore_verify_layout(unsigned total_comps, struct ore_layout *layout);
int ore_get_rw_state(struct ore_layout *layout, struct ore_components *comps,
bool is_reading, u64 offset, u64 length,
struct ore_io_state **ios);