#include <linux/slab.h>
#include <asm/div64.h>
+#include <linux/lcm.h>
-#include <scsi/osd_ore.h>
+#include "ore_raid.h"
-#define ORE_ERR(fmt, a...) printk(KERN_ERR "ore: " fmt, ##a)
+MODULE_AUTHOR("Boaz Harrosh <bharrosh@panasas.com>");
+MODULE_DESCRIPTION("Objects Raid Engine ore.ko");
+MODULE_LICENSE("GPL");
-#ifdef CONFIG_EXOFS_DEBUG
-#define ORE_DBGMSG(fmt, a...) \
- printk(KERN_NOTICE "ore @%s:%d: " fmt, __func__, __LINE__, ##a)
-#else
-#define ORE_DBGMSG(fmt, a...) \
- do { if (0) printk(fmt, ##a); } while (0)
-#endif
+/* 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.
+ */
-/* u64 has problems with printk this will cast it to unsigned long long */
-#define _LLU(x) (unsigned long long)(x)
+enum { BIO_MAX_PAGES_KMALLOC =
+ (PAGE_SIZE - sizeof(struct bio)) / sizeof(struct bio_vec),};
-#define ORE_DBGMSG2(M...) do {} while (0)
-/* #define ORE_DBGMSG2 ORE_DBGMSG */
+int ore_verify_layout(unsigned total_comps, struct ore_layout *layout)
+{
+ u64 stripe_length;
-MODULE_AUTHOR("Boaz Harrosh <bharrosh@panasas.com>");
-MODULE_DESCRIPTION("Objects Raid Engine ore.ko");
-MODULE_LICENSE("GPL");
+/* 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;
+ }
-static void ore_calc_stripe_info(struct ore_layout *layout, u64 file_offset,
- struct ore_striping_info *si);
+ 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)
{
static struct osd_dev *_ios_od(struct ore_io_state *ios, unsigned index)
{
+ ORE_DBGMSG2("oc->first_dev=%d oc->numdevs=%d i=%d oc->ods=%p\n",
+ ios->oc->first_dev, ios->oc->numdevs, index,
+ ios->oc->ods);
+
return ore_comp_dev(ios->oc, index);
}
-static int _get_io_state(struct ore_layout *layout,
- struct ore_components *oc, unsigned numdevs,
- struct ore_io_state **pios)
+static int _ore_get_io_state(struct ore_layout *layout,
+ struct ore_components *oc, unsigned numdevs,
+ unsigned sgs_per_dev, unsigned num_par_pages,
+ struct ore_io_state **pios)
{
struct ore_io_state *ios;
+ struct page **pages;
+ struct osd_sg_entry *sgilist;
+ struct __alloc_all_io_state {
+ struct ore_io_state ios;
+ struct ore_per_dev_state per_dev[numdevs];
+ union {
+ struct osd_sg_entry sglist[sgs_per_dev * numdevs];
+ struct page *pages[num_par_pages];
+ };
+ } *_aios;
+
+ if (likely(sizeof(*_aios) <= PAGE_SIZE)) {
+ _aios = kzalloc(sizeof(*_aios), GFP_KERNEL);
+ if (unlikely(!_aios)) {
+ ORE_DBGMSG("Failed kzalloc bytes=%zd\n",
+ sizeof(*_aios));
+ *pios = NULL;
+ return -ENOMEM;
+ }
+ pages = num_par_pages ? _aios->pages : NULL;
+ sgilist = sgs_per_dev ? _aios->sglist : NULL;
+ ios = &_aios->ios;
+ } else {
+ struct __alloc_small_io_state {
+ struct ore_io_state ios;
+ struct ore_per_dev_state per_dev[numdevs];
+ } *_aio_small;
+ union __extra_part {
+ struct osd_sg_entry sglist[sgs_per_dev * numdevs];
+ struct page *pages[num_par_pages];
+ } *extra_part;
+
+ _aio_small = kzalloc(sizeof(*_aio_small), GFP_KERNEL);
+ if (unlikely(!_aio_small)) {
+ ORE_DBGMSG("Failed alloc first part bytes=%zd\n",
+ sizeof(*_aio_small));
+ *pios = NULL;
+ return -ENOMEM;
+ }
+ extra_part = kzalloc(sizeof(*extra_part), GFP_KERNEL);
+ if (unlikely(!extra_part)) {
+ ORE_DBGMSG("Failed alloc second part bytes=%zd\n",
+ sizeof(*extra_part));
+ kfree(_aio_small);
+ *pios = NULL;
+ return -ENOMEM;
+ }
- /*TODO: Maybe use kmem_cach per sbi of size
- * exofs_io_state_size(layout->s_numdevs)
- */
- ios = kzalloc(ore_io_state_size(numdevs), GFP_KERNEL);
- if (unlikely(!ios)) {
- ORE_DBGMSG("Failed kzalloc bytes=%d\n",
- ore_io_state_size(numdevs));
- *pios = NULL;
- return -ENOMEM;
+ pages = num_par_pages ? extra_part->pages : NULL;
+ sgilist = sgs_per_dev ? extra_part->sglist : NULL;
+ /* In this case the per_dev[0].sgilist holds the pointer to
+ * be freed
+ */
+ ios = &_aio_small->ios;
+ ios->extra_part_alloc = true;
+ }
+
+ if (pages) {
+ ios->parity_pages = pages;
+ ios->max_par_pages = num_par_pages;
+ }
+ if (sgilist) {
+ unsigned d;
+
+ for (d = 0; d < numdevs; ++d) {
+ ios->per_dev[d].sglist = sgilist;
+ sgilist += sgs_per_dev;
+ }
+ ios->sgs_per_dev = sgs_per_dev;
}
ios->layout = layout;
{
struct ore_io_state *ios;
unsigned numdevs = layout->group_width * layout->mirrors_p1;
+ unsigned sgs_per_dev = 0, max_par_pages = 0;
int ret;
- ret = _get_io_state(layout, oc, numdevs, pios);
+ if (layout->parity && length) {
+ unsigned data_devs = layout->group_width - layout->parity;
+ unsigned stripe_size = layout->stripe_unit * data_devs;
+ unsigned pages_in_unit = layout->stripe_unit / PAGE_SIZE;
+ u32 remainder;
+ u64 num_stripes;
+ u64 num_raid_units;
+
+ num_stripes = div_u64_rem(length, stripe_size, &remainder);
+ if (remainder)
+ ++num_stripes;
+
+ num_raid_units = num_stripes * layout->parity;
+
+ if (is_reading) {
+ /* For reads add per_dev sglist array */
+ /* TODO: Raid 6 we need twice more. Actually:
+ * num_stripes / LCMdP(W,P);
+ * if (W%P != 0) num_stripes *= parity;
+ */
+
+ /* first/last seg is split */
+ num_raid_units += layout->group_width;
+ sgs_per_dev = div_u64(num_raid_units, data_devs);
+ } else {
+ /* For Writes add parity pages array. */
+ max_par_pages = num_raid_units * pages_in_unit *
+ sizeof(struct page *);
+ }
+ }
+
+ ret = _ore_get_io_state(layout, oc, numdevs, sgs_per_dev, max_par_pages,
+ pios);
if (unlikely(ret))
return ret;
ios->offset = offset;
if (length) {
- ore_calc_stripe_info(layout, offset, &ios->si);
- ios->length = (length <= ios->si.group_length) ? length :
- ios->si.group_length;
+ ore_calc_stripe_info(layout, offset, length, &ios->si);
+ ios->length = ios->si.length;
ios->nr_pages = (ios->length + PAGE_SIZE - 1) / PAGE_SIZE;
+ if (layout->parity)
+ _ore_post_alloc_raid_stuff(ios);
}
return 0;
int ore_get_io_state(struct ore_layout *layout, struct ore_components *oc,
struct ore_io_state **pios)
{
- return _get_io_state(layout, oc, oc->numdevs, pios);
+ return _ore_get_io_state(layout, oc, oc->numdevs, 0, 0, pios);
}
EXPORT_SYMBOL(ore_get_io_state);
bio_put(per_dev->bio);
}
+ _ore_free_raid_stuff(ios);
kfree(ios);
}
}
}
}
-int ore_check_io(struct ore_io_state *ios, u64 *resid)
+int ore_check_io(struct ore_io_state *ios, ore_on_dev_error on_dev_error)
{
enum osd_err_priority acumulated_osd_err = 0;
int acumulated_lin_err = 0;
for (i = 0; i < ios->numdevs; i++) {
struct osd_sense_info osi;
- struct osd_request *or = ios->per_dev[i].or;
+ struct ore_per_dev_state *per_dev = &ios->per_dev[i];
+ struct osd_request *or = per_dev->or;
int ret;
if (unlikely(!or))
if (OSD_ERR_PRI_CLEAR_PAGES == osi.osd_err_pri) {
/* start read offset passed endof file */
- _clear_bio(ios->per_dev[i].bio);
+ _clear_bio(per_dev->bio);
ORE_DBGMSG("start read offset passed end of file "
"offset=0x%llx, length=0x%llx\n",
- _LLU(ios->per_dev[i].offset),
- _LLU(ios->per_dev[i].length));
+ _LLU(per_dev->offset),
+ _LLU(per_dev->length));
continue; /* we recovered */
}
+ if (on_dev_error) {
+ u64 residual = ios->reading ?
+ or->in.residual : or->out.residual;
+ u64 offset = (ios->offset + ios->length) - residual;
+ struct ore_dev *od = ios->oc->ods[
+ per_dev->dev - ios->oc->first_dev];
+
+ on_dev_error(ios, od, per_dev->dev, osi.osd_err_pri,
+ offset, residual);
+ }
if (osi.osd_err_pri >= acumulated_osd_err) {
acumulated_osd_err = osi.osd_err_pri;
acumulated_lin_err = ret;
}
}
- /* TODO: raid specific residual calculations */
- if (resid) {
- if (likely(!acumulated_lin_err))
- *resid = 0;
- else
- *resid = ios->length;
- }
-
return acumulated_lin_err;
}
EXPORT_SYMBOL(ore_check_io);
/*
* L - logical offset into the file
*
- * U - The number of bytes in a stripe within a group
+ * D - number of Data devices
+ * D = group_width - parity
*
- * U = stripe_unit * group_width
+ * U - The number of bytes in a stripe within a group
+ * U = stripe_unit * D
*
* T - The number of bytes striped within a group of component objects
* (before advancing to the next group)
- *
- * T = stripe_unit * group_width * group_depth
+ * T = U * group_depth
*
* S - The number of bytes striped across all component objects
* before the pattern repeats
+ * S = T * group_count
*
- * S = stripe_unit * group_width * group_depth * group_count
- *
- * M - The "major" (i.e., across all components) stripe number
- *
+ * M - The "major" (i.e., across all components) cycle number
* M = L / S
*
- * G - Counts the groups from the beginning of the major stripe
- *
+ * G - Counts the groups from the beginning of the major cycle
* G = (L - (M * S)) / T [or (L % S) / T]
*
* H - The byte offset within the group
- *
* H = (L - (M * S)) % T [or (L % S) % T]
*
* N - The "minor" (i.e., across the group) stripe number
- *
* N = H / U
*
* C - The component index coresponding to L
*
- * C = (H - (N * U)) / stripe_unit + G * group_width
- * [or (L % U) / stripe_unit + G * group_width]
+ * C = (H - (N * U)) / stripe_unit + G * D
+ * [or (L % U) / stripe_unit + G * D]
*
* O - The component offset coresponding to L
- *
* O = L % stripe_unit + N * stripe_unit + M * group_depth * stripe_unit
+ *
+ * LCMdP – Parity cycle: Lowest Common Multiple of group_width, parity
+ * divide by parity
+ * LCMdP = lcm(group_width, parity) / parity
+ *
+ * R - The parity Rotation stripe
+ * (Note parity cycle always starts at a group's boundary)
+ * R = N % LCMdP
+ *
+ * I = the first parity device index
+ * I = (group_width + group_width - R*parity - parity) % group_width
+ *
+ * Craid - The component index Rotated
+ * Craid = (group_width + C - R*parity) % group_width
+ * (We add the group_width to avoid negative numbers modulo math)
*/
-static void ore_calc_stripe_info(struct ore_layout *layout, u64 file_offset,
- struct ore_striping_info *si)
+void ore_calc_stripe_info(struct ore_layout *layout, u64 file_offset,
+ u64 length, struct ore_striping_info *si)
{
u32 stripe_unit = layout->stripe_unit;
u32 group_width = layout->group_width;
u64 group_depth = layout->group_depth;
+ u32 parity = layout->parity;
- u32 U = stripe_unit * group_width;
+ u32 D = group_width - parity;
+ u32 U = D * stripe_unit;
u64 T = U * group_depth;
u64 S = T * layout->group_count;
u64 M = div64_u64(file_offset, S);
u32 N = div_u64(H, U);
/* "H - (N * U)" is just "H % U" so it's bound to u32 */
- si->dev = (u32)(H - (N * U)) / stripe_unit + G * group_width;
- si->dev *= layout->mirrors_p1;
+ u32 C = (u32)(H - (N * U)) / stripe_unit + G * group_width;
div_u64_rem(file_offset, stripe_unit, &si->unit_off);
si->obj_offset = si->unit_off + (N * stripe_unit) +
(M * group_depth * stripe_unit);
- si->group_length = T - H;
+ if (parity) {
+ u32 LCMdP = lcm(group_width, parity) / parity;
+ /* R = N % LCMdP; */
+ u32 RxP = (N % LCMdP) * parity;
+ u32 first_dev = C - C % group_width;
+
+ si->par_dev = (group_width + group_width - parity - RxP) %
+ group_width + first_dev;
+ si->dev = (group_width + C - RxP) % group_width + first_dev;
+ si->bytes_in_stripe = U;
+ si->first_stripe_start = M * S + G * T + N * U;
+ } else {
+ /* Make the math correct see _prepare_one_group */
+ si->par_dev = group_width;
+ si->dev = C;
+ }
+
+ si->dev *= layout->mirrors_p1;
+ si->par_dev *= layout->mirrors_p1;
+ si->offset = file_offset;
+ si->length = T - H;
+ if (si->length > length)
+ si->length = length;
si->M = M;
}
+EXPORT_SYMBOL(ore_calc_stripe_info);
-static int _add_stripe_unit(struct ore_io_state *ios, unsigned *cur_pg,
- unsigned pgbase, struct ore_per_dev_state *per_dev,
- int cur_len)
+int _ore_add_stripe_unit(struct ore_io_state *ios, unsigned *cur_pg,
+ unsigned pgbase, struct page **pages,
+ struct ore_per_dev_state *per_dev, int cur_len)
{
unsigned pg = *cur_pg;
struct request_queue *q =
if (per_dev->bio == NULL) {
unsigned pages_in_stripe = ios->layout->group_width *
(ios->layout->stripe_unit / PAGE_SIZE);
- unsigned bio_size = (ios->nr_pages + pages_in_stripe) /
- ios->layout->group_width;
+ unsigned nr_pages = ios->nr_pages * ios->layout->group_width /
+ (ios->layout->group_width -
+ ios->layout->parity);
+ unsigned bio_size = (nr_pages + pages_in_stripe) /
+ ios->layout->group_width;
per_dev->bio = bio_kmalloc(GFP_KERNEL, bio_size);
if (unlikely(!per_dev->bio)) {
unsigned pglen = min_t(unsigned, PAGE_SIZE - pgbase, cur_len);
unsigned added_len;
- BUG_ON(ios->nr_pages <= pg);
cur_len -= pglen;
- added_len = bio_add_pc_page(q, per_dev->bio, ios->pages[pg],
+ added_len = bio_add_pc_page(q, per_dev->bio, pages[pg],
pglen, pgbase);
if (unlikely(pglen != added_len)) {
+ ORE_DBGMSG("Failed bio_add_pc_page bi_vcnt=%u\n",
+ per_dev->bio->bi_vcnt);
ret = -ENOMEM;
goto out;
}
struct ore_striping_info *si = &ios->si;
unsigned stripe_unit = ios->layout->stripe_unit;
unsigned mirrors_p1 = ios->layout->mirrors_p1;
- unsigned devs_in_group = ios->layout->group_width * mirrors_p1;
+ unsigned group_width = ios->layout->group_width;
+ unsigned devs_in_group = group_width * mirrors_p1;
unsigned dev = si->dev;
unsigned first_dev = dev - (dev % devs_in_group);
+ unsigned dev_order;
unsigned cur_pg = ios->pages_consumed;
u64 length = ios->length;
int ret = 0;
return 0;
}
- BUG_ON(length > si->group_length);
+ BUG_ON(length > si->length);
+
+ dev_order = _dev_order(devs_in_group, mirrors_p1, si->par_dev, dev);
+ si->cur_comp = dev_order;
while (length) {
unsigned comp = dev - first_dev;
if (!per_dev->length) {
per_dev->dev = dev;
- if (dev < si->dev) {
- per_dev->offset = si->obj_offset + stripe_unit -
- si->unit_off;
- cur_len = stripe_unit;
- } else if (dev == si->dev) {
+ if (dev == si->dev) {
+ WARN_ON(dev == si->par_dev);
per_dev->offset = si->obj_offset;
cur_len = stripe_unit - si->unit_off;
page_off = si->unit_off & ~PAGE_MASK;
BUG_ON(page_off && (page_off != ios->pgbase));
- } else { /* dev > si->dev */
- per_dev->offset = si->obj_offset - si->unit_off;
+ } else {
+ if (si->cur_comp > dev_order)
+ per_dev->offset =
+ si->obj_offset - si->unit_off;
+ else /* si->cur_comp < dev_order */
+ per_dev->offset =
+ si->obj_offset + stripe_unit -
+ si->unit_off;
cur_len = stripe_unit;
}
} else {
if (cur_len >= length)
cur_len = length;
- ret = _add_stripe_unit(ios, &cur_pg, page_off , per_dev,
- cur_len);
+ ret = _ore_add_stripe_unit(ios, &cur_pg, page_off, ios->pages,
+ per_dev, cur_len);
if (unlikely(ret))
goto out;
dev = (dev % devs_in_group) + first_dev;
length -= cur_len;
+
+ si->cur_comp = (si->cur_comp + 1) % group_width;
+ if (unlikely((dev == si->par_dev) ||
+ (!length && ios->parity_pages))) {
+ if (!length)
+ /* If we are writing and this is the very last
+ * stripe. then operate on parity dev.
+ */
+ dev = si->par_dev;
+ if (ios->reading)
+ /* In writes cur_len just means if it's the
+ * last one. See _ore_add_parity_unit.
+ */
+ cur_len = length;
+ per_dev = &ios->per_dev[dev - first_dev];
+ if (!per_dev->length) {
+ /* Only/always the parity unit of the first
+ * stripe will be empty. So this is a chance to
+ * initialize the per_dev info.
+ */
+ per_dev->dev = dev;
+ per_dev->offset = si->obj_offset - si->unit_off;
+ }
+
+ ret = _ore_add_parity_unit(ios, si, per_dev, cur_len);
+ if (unlikely(ret))
+ goto out;
+
+ /* Rotate next par_dev backwards with wraping */
+ si->par_dev = (devs_in_group + si->par_dev -
+ ios->layout->parity * mirrors_p1) %
+ devs_in_group + first_dev;
+ /* Next stripe, start fresh */
+ si->cur_comp = 0;
+ }
}
out:
ios->numdevs = devs_in_group;
per_dev->or = or;
if (ios->pages) {
- osd_req_read(or, obj, per_dev->offset,
- per_dev->bio, per_dev->length);
+ if (per_dev->cur_sg) {
+ /* finalize the last sg_entry */
+ _ore_add_sg_seg(per_dev, 0, false);
+ if (unlikely(!per_dev->cur_sg))
+ return 0; /* Skip parity only device */
+
+ osd_req_read_sg(or, obj, per_dev->bio,
+ per_dev->sglist, per_dev->cur_sg);
+ } else {
+ /* The no raid case */
+ osd_req_read(or, obj, per_dev->offset,
+ per_dev->bio, per_dev->length);
+ }
+
ORE_DBGMSG("read(0x%llx) offset=0x%llx length=0x%llx"
- " dev=%d\n", _LLU(obj->id),
+ " dev=%d sg_len=%d\n", _LLU(obj->id),
_LLU(per_dev->offset), _LLU(per_dev->length),
- first_dev);
+ first_dev, per_dev->cur_sg);
} else {
BUG_ON(ios->kern_buff);
{
unsigned stripe_unit = layout->stripe_unit;
- ore_calc_stripe_info(layout, file_offset, &ti->si);
+ ore_calc_stripe_info(layout, file_offset, 0, &ti->si);
ti->prev_group_obj_off = ti->si.M * stripe_unit;
ti->next_group_obj_off = ti->si.M ? (ti->si.M - 1) * stripe_unit : 0;
git.openpandora.org / pandora-kernel.git / blobdiff