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>
diff --git a/fs/exofs/inode.c b/fs/exofs/inode.c
index 96366a1..5a62420 100644
--- a/fs/exofs/inode.c
+++ b/fs/exofs/inode.c
@@ -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 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;
}
diff --git a/fs/exofs/ore.c b/fs/exofs/ore.c
index f1b7180..4ca59d4 100644
--- a/fs/exofs/ore.c
+++ b/fs/exofs/ore.c
@@ -47,9 +47,76 @@
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;
diff --git a/fs/exofs/super.c b/fs/exofs/super.c
index bce3686..057b237 100644
--- a/fs/exofs/super.c
+++ b/fs/exofs/super.c
@@ -480,7 +480,7 @@
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 @@
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 @@
_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)
diff --git a/include/scsi/osd_ore.h b/include/scsi/osd_ore.h
index 492b70d..716dbea 100644
--- a/include/scsi/osd_ore.h
+++ b/include/scsi/osd_ore.h
@@ -42,6 +42,13 @@
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 @@
}
/* 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);
