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Merge branch 'for-linus' of git://git.open-osd.org/linux-open-osd

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* 'for-linus' of git://git.open-osd.org/linux-open-osd: (21 commits)
  ore: Enable RAID5 mounts
  exofs: Support for RAID5 read-4-write interface.
  ore: RAID5 Write
  ore: RAID5 read
  fs/Makefile: Always inspect exofs/
  ore: Make ore_calc_stripe_info EXPORT_SYMBOL
  ore/exofs: Change ore_check_io API
  ore/exofs: Define new ore_verify_layout
  ore: Support for partial component table
  ore: Support for short read/writes
  exofs: Support for short read/writes
  ore: Remove check for ios->kern_buff in _prepare_for_striping to later
  ore: cleanup: Embed an ore_striping_info inside ore_io_state
  ore: Only IO one group at a time (API change)
  ore/exofs: Change the type of the devices array (API change)
  ore: Make ore_striping_info and ore_calc_stripe_info public
  exofs: Remove unused data_map member from exofs_sb_info
  exofs: Rename struct ore_components comps => oc
  exofs/super.c: local functions should be static
  exofs/ore.c: local functions should be static
  ...
This commit is contained in:
Linus Torvalds 2011-10-26 21:33:50 +02:00
commit c28cfd60e4
11 changed files with 1585 additions and 376 deletions
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4
drivers/scsi/osd/Kconfig
View File

@ -11,10 +11,6 @@
# it under the terms of the GNU General Public version 2 License as
# published by the Free Software Foundation
#
# FIXME: SCSI_OSD_INITIATOR should select CONFIG (HMAC) SHA1 somehow.
# How is it done properly?
#
config SCSI_OSD_INITIATOR
tristate "OSD-Initiator library"
depends on SCSI

2
fs/Makefile
View File

@ -120,6 +120,6 @@ obj-$(CONFIG_DEBUG_FS) += debugfs/
obj-$(CONFIG_OCFS2_FS) += ocfs2/
obj-$(CONFIG_BTRFS_FS) += btrfs/
obj-$(CONFIG_GFS2_FS) += gfs2/
obj-$(CONFIG_EXOFS_FS) += exofs/
obj-$(y) += exofs/ # Multiple mods, used by nfs/objlayout
obj-$(CONFIG_CEPH_FS) += ceph/
obj-$(CONFIG_PSTORE) += pstore/

3
fs/exofs/Kbuild
View File

@ -13,7 +13,8 @@
#
# ore module library
obj-$(CONFIG_ORE) += ore.o
libore-y := ore.o ore_raid.o
obj-$(CONFIG_ORE) += libore.o
exofs-y := inode.o file.o symlink.o namei.o dir.o super.o
obj-$(CONFIG_EXOFS_FS) += exofs.o

9
fs/exofs/Kconfig
View File

@ -1,10 +1,17 @@
# Note ORE needs to "select ASYNC_XOR". So Not to force multiple selects
# for every ORE user we do it like this. Any user should add itself here
# at the "depends on EXOFS_FS || ..." with an ||. The dependencies are
# selected here, and we default to "ON". So in effect it is like been
# selected by any of the users.
config ORE
tristate
depends on EXOFS_FS
select ASYNC_XOR
default SCSI_OSD_ULD
config EXOFS_FS
tristate "exofs: OSD based file system support"
depends on SCSI_OSD_ULD
select ORE
help
EXOFS is a file system that uses an OSD storage device,
as its backing storage.

26
fs/exofs/exofs.h
View File

@ -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
*/
@ -66,13 +70,9 @@ 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 comps; /* comps for the partition */
struct osd_dev *_min_one_dev[1]; /* Place holder for one dev */
struct ore_components oc; /* comps for the partition */
};
/*
@ -86,7 +86,7 @@ struct exofs_i_info {
uint32_t i_dir_start_lookup; /* which page to start lookup */
uint64_t i_commit_size; /* the object's written length */
struct ore_comp one_comp; /* same component for all devices */
struct ore_components comps; /* inode view of the device table */
struct ore_components oc; /* inode view of the device table */
};
static inline osd_id exofs_oi_objno(struct exofs_i_info *oi)
@ -207,7 +207,7 @@ extern const struct inode_operations exofs_fast_symlink_inode_operations;
* bigger and that the device table repeats twice.
* See: exofs_read_lookup_dev_table()
*/
static inline void exofs_init_comps(struct ore_components *comps,
static inline void exofs_init_comps(struct ore_components *oc,
struct ore_comp *one_comp,
struct exofs_sb_info *sbi, osd_id oid)
{
@ -217,13 +217,15 @@ static inline void exofs_init_comps(struct ore_components *comps,
one_comp->obj.id = oid;
exofs_make_credential(one_comp->cred, &one_comp->obj);
comps->numdevs = sbi->comps.numdevs;
comps->single_comp = EC_SINGLE_COMP;
comps->comps = one_comp;
oc->first_dev = 0;
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->comps.numdevs;
comps->ods = sbi->comps.ods + first_dev;
first_dev = (dev_mod * sbi->layout.mirrors_p1) % sbi->oc.numdevs;
oc->ods = &sbi->oc.ods[first_dev];
}
#endif

233
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;
}
@ -68,6 +63,7 @@ struct page_collect {
bool read_4_write; /* This means two things: that the read is sync
* And the pages should not be unlocked.
*/
struct page *that_locked_page;
};
static void _pcol_init(struct page_collect *pcol, unsigned expected_pages,
@ -86,6 +82,7 @@ static void _pcol_init(struct page_collect *pcol, unsigned expected_pages,
pcol->length = 0;
pcol->pg_first = -1;
pcol->read_4_write = false;
pcol->that_locked_page = NULL;
}
static void _pcol_reset(struct page_collect *pcol)
@ -98,6 +95,7 @@ static void _pcol_reset(struct page_collect *pcol)
pcol->length = 0;
pcol->pg_first = -1;
pcol->ios = NULL;
pcol->that_locked_page = NULL;
/* this is probably the end of the loop but in writes
* it might not end here. don't be left with nothing
@ -149,14 +147,17 @@ static int pcol_add_page(struct page_collect *pcol, struct page *page,
return 0;
}
enum {PAGE_WAS_NOT_IN_IO = 17};
static int update_read_page(struct page *page, int ret)
{
if (ret == 0) {
switch (ret) {
case 0:
/* Everything is OK */
SetPageUptodate(page);
if (PageError(page))
ClearPageError(page);
} else if (ret == -EFAULT) {
break;
case -EFAULT:
/* In this case we were trying to read something that wasn't on
* disk yet - return a page full of zeroes. This should be OK,
* because the object should be empty (if there was a write
@ -167,16 +168,22 @@ static int update_read_page(struct page *page, int ret)
SetPageUptodate(page);
if (PageError(page))
ClearPageError(page);
ret = 0; /* recovered error */
EXOFS_DBGMSG("recovered read error\n");
} else /* Error */
/* fall through */
case PAGE_WAS_NOT_IN_IO:
ret = 0; /* recovered error */
break;
default:
SetPageError(page);
}
return ret;
}
static void update_write_page(struct page *page, int ret)
{
if (unlikely(ret == PAGE_WAS_NOT_IN_IO))
return; /* don't pass start don't collect $200 */
if (ret) {
mapping_set_error(page->mapping, ret);
SetPageError(page);
@ -190,15 +197,16 @@ static void update_write_page(struct page *page, int ret)
static int __readpages_done(struct page_collect *pcol)
{
int i;
u64 resid;
u64 good_bytes;
u64 length = 0;
int ret = ore_check_io(pcol->ios, &resid);
int ret = ore_check_io(pcol->ios, NULL);
if (likely(!ret))
if (likely(!ret)) {
good_bytes = pcol->length;
else
good_bytes = pcol->length - resid;
ret = PAGE_WAS_NOT_IN_IO;
} else {
good_bytes = 0;
}
EXOFS_DBGMSG2("readpages_done(0x%lx) good_bytes=0x%llx"
" length=0x%lx nr_pages=%u\n",
@ -259,6 +267,46 @@ static void _unlock_pcol_pages(struct page_collect *pcol, int ret, int rw)
}
}
static int _maybe_not_all_in_one_io(struct ore_io_state *ios,
struct page_collect *pcol_src, struct page_collect *pcol)
{
/* length was wrong or offset was not page aligned */
BUG_ON(pcol_src->nr_pages < ios->nr_pages);
if (pcol_src->nr_pages > ios->nr_pages) {
struct page **src_page;
unsigned pages_less = pcol_src->nr_pages - ios->nr_pages;
unsigned long len_less = pcol_src->length - ios->length;
unsigned i;
int ret;
/* This IO was trimmed */
pcol_src->nr_pages = ios->nr_pages;
pcol_src->length = ios->length;
/* Left over pages are passed to the next io */
pcol->expected_pages += pages_less;
pcol->nr_pages = pages_less;
pcol->length = len_less;
src_page = pcol_src->pages + pcol_src->nr_pages;
pcol->pg_first = (*src_page)->index;
ret = pcol_try_alloc(pcol);
if (unlikely(ret))
return ret;
for (i = 0; i < pages_less; ++i)
pcol->pages[i] = *src_page++;
EXOFS_DBGMSG("Length was adjusted nr_pages=0x%x "
"pages_less=0x%x expected_pages=0x%x "
"next_offset=0x%llx next_len=0x%lx\n",
pcol_src->nr_pages, pages_less, pcol->expected_pages,
pcol->pg_first * PAGE_SIZE, pcol->length);
}
return 0;
}
static int read_exec(struct page_collect *pcol)
{
struct exofs_i_info *oi = exofs_i(pcol->inode);
@ -270,7 +318,7 @@ static int read_exec(struct page_collect *pcol)
return 0;
if (!pcol->ios) {
int ret = ore_get_rw_state(&pcol->sbi->layout, &oi->comps, true,
int ret = ore_get_rw_state(&pcol->sbi->layout, &oi->oc, true,
pcol->pg_first << PAGE_CACHE_SHIFT,
pcol->length, &pcol->ios);
@ -280,7 +328,6 @@ static int read_exec(struct page_collect *pcol)
ios = pcol->ios;
ios->pages = pcol->pages;
ios->nr_pages = pcol->nr_pages;
if (pcol->read_4_write) {
ore_read(pcol->ios);
@ -296,17 +343,23 @@ static int read_exec(struct page_collect *pcol)
*pcol_copy = *pcol;
ios->done = readpages_done;
ios->private = pcol_copy;
/* pages ownership was passed to pcol_copy */
_pcol_reset(pcol);
ret = _maybe_not_all_in_one_io(ios, pcol_copy, pcol);
if (unlikely(ret))
goto err;
EXOFS_DBGMSG2("read_exec(0x%lx) offset=0x%llx length=0x%llx\n",
pcol->inode->i_ino, _LLU(ios->offset), _LLU(ios->length));
ret = ore_read(ios);
if (unlikely(ret))
goto err;
atomic_inc(&pcol->sbi->s_curr_pending);
EXOFS_DBGMSG2("read_exec obj=0x%llx start=0x%llx length=0x%lx\n",
oi->one_comp.obj.id, _LLU(ios->offset), pcol->length);
/* pages ownership was passed to pcol_copy */
_pcol_reset(pcol);
return 0;
err:
@ -341,6 +394,8 @@ static int readpage_strip(void *data, struct page *page)
EXOFS_ERR("PageUptodate(0x%lx, 0x%lx)\n", pcol->inode->i_ino,
page->index);
pcol->that_locked_page = page;
if (page->index < end_index)
len = PAGE_CACHE_SIZE;
else if (page->index == end_index)
@ -429,6 +484,10 @@ static int exofs_readpages(struct file *file, struct address_space *mapping,
return ret;
}
ret = read_exec(&pcol);
if (unlikely(ret))
return ret;
return read_exec(&pcol);
}
@ -462,17 +521,18 @@ static void writepages_done(struct ore_io_state *ios, void *p)
{
struct page_collect *pcol = p;
int i;
u64 resid;
u64 good_bytes;
u64 length = 0;
int ret = ore_check_io(ios, &resid);
int ret = ore_check_io(ios, NULL);
atomic_dec(&pcol->sbi->s_curr_pending);
if (likely(!ret))
if (likely(!ret)) {
good_bytes = pcol->length;
else
good_bytes = pcol->length - resid;
ret = PAGE_WAS_NOT_IN_IO;
} else {
good_bytes = 0;
}
EXOFS_DBGMSG2("writepages_done(0x%lx) good_bytes=0x%llx"
" length=0x%lx nr_pages=%u\n",
@ -505,6 +565,56 @@ static void writepages_done(struct ore_io_state *ios, void *p)
EXOFS_DBGMSG2("writepages_done END\n");
}
static struct page *__r4w_get_page(void *priv, u64 offset, bool *uptodate)
{
struct page_collect *pcol = priv;
pgoff_t index = offset / PAGE_SIZE;
if (!pcol->that_locked_page ||
(pcol->that_locked_page->index != index)) {
struct page *page = find_get_page(pcol->inode->i_mapping, index);
if (!page) {
page = find_or_create_page(pcol->inode->i_mapping,
index, GFP_NOFS);
if (unlikely(!page)) {
EXOFS_DBGMSG("grab_cache_page Failed "
"index=0x%llx\n", _LLU(index));
return NULL;
}
unlock_page(page);
}
if (PageDirty(page) || PageWriteback(page))
*uptodate = true;
else
*uptodate = PageUptodate(page);
EXOFS_DBGMSG("index=0x%lx uptodate=%d\n", index, *uptodate);
return page;
} else {
EXOFS_DBGMSG("YES that_locked_page index=0x%lx\n",
pcol->that_locked_page->index);
*uptodate = true;
return pcol->that_locked_page;
}
}
static void __r4w_put_page(void *priv, struct page *page)
{
struct page_collect *pcol = priv;
if (pcol->that_locked_page != page) {
EXOFS_DBGMSG("index=0x%lx\n", page->index);
page_cache_release(page);
return;
}
EXOFS_DBGMSG("that_locked_page index=0x%lx\n", page->index);
}
static const struct _ore_r4w_op _r4w_op = {
.get_page = &__r4w_get_page,
.put_page = &__r4w_put_page,
};
static int write_exec(struct page_collect *pcol)
{
struct exofs_i_info *oi = exofs_i(pcol->inode);
@ -516,10 +626,9 @@ static int write_exec(struct page_collect *pcol)
return 0;
BUG_ON(pcol->ios);
ret = ore_get_rw_state(&pcol->sbi->layout, &oi->comps, false,
ret = ore_get_rw_state(&pcol->sbi->layout, &oi->oc, false,
pcol->pg_first << PAGE_CACHE_SHIFT,
pcol->length, &pcol->ios);
if (unlikely(ret))
goto err;
@ -534,10 +643,20 @@ static int write_exec(struct page_collect *pcol)
ios = pcol->ios;
ios->pages = pcol_copy->pages;
ios->nr_pages = pcol_copy->nr_pages;
ios->done = writepages_done;
ios->r4w = &_r4w_op;
ios->private = pcol_copy;
/* pages ownership was passed to pcol_copy */
_pcol_reset(pcol);
ret = _maybe_not_all_in_one_io(ios, pcol_copy, pcol);
if (unlikely(ret))
goto err;
EXOFS_DBGMSG2("write_exec(0x%lx) offset=0x%llx length=0x%llx\n",
pcol->inode->i_ino, _LLU(ios->offset), _LLU(ios->length));
ret = ore_write(ios);
if (unlikely(ret)) {
EXOFS_ERR("write_exec: ore_write() Failed\n");
@ -545,11 +664,6 @@ static int write_exec(struct page_collect *pcol)
}
atomic_inc(&pcol->sbi->s_curr_pending);
EXOFS_DBGMSG2("write_exec(0x%lx, 0x%llx) start=0x%llx length=0x%lx\n",
pcol->inode->i_ino, pcol->pg_first, _LLU(ios->offset),
pcol->length);
/* pages ownership was passed to pcol_copy */
_pcol_reset(pcol);
return 0;
err:
@ -689,14 +803,33 @@ static int exofs_writepages(struct address_space *mapping,
_pcol_init(&pcol, expected_pages, mapping->host);
ret = write_cache_pages(mapping, wbc, writepage_strip, &pcol);
if (ret) {
if (unlikely(ret)) {
EXOFS_ERR("write_cache_pages => %d\n", ret);
return ret;
}
return write_exec(&pcol);
ret = write_exec(&pcol);
if (unlikely(ret))
return ret;
if (wbc->sync_mode == WB_SYNC_ALL) {
return write_exec(&pcol); /* pump the last reminder */
} else if (pcol.nr_pages) {
/* not SYNC let the reminder join the next writeout */
unsigned i;
for (i = 0; i < pcol.nr_pages; i++) {
struct page *page = pcol.pages[i];
end_page_writeback(page);
set_page_dirty(page);
unlock_page(page);
}
}
return 0;
}
/*
static int exofs_writepage(struct page *page, struct writeback_control *wbc)
{
struct page_collect pcol;
@ -712,7 +845,7 @@ static int exofs_writepage(struct page *page, struct writeback_control *wbc)
return write_exec(&pcol);
}
*/
/* i_mutex held using inode->i_size directly */
static void _write_failed(struct inode *inode, loff_t to)
{
@ -818,7 +951,7 @@ static void exofs_invalidatepage(struct page *page, unsigned long offset)
const struct address_space_operations exofs_aops = {
.readpage = exofs_readpage,
.readpages = exofs_readpages,
.writepage = exofs_writepage,
.writepage = NULL,
.writepages = exofs_writepages,
.write_begin = exofs_write_begin_export,
.write_end = exofs_write_end,
@ -860,7 +993,7 @@ static int _do_truncate(struct inode *inode, loff_t newsize)
inode->i_mtime = inode->i_ctime = CURRENT_TIME;
ret = ore_truncate(&sbi->layout, &oi->comps, (u64)newsize);
ret = ore_truncate(&sbi->layout, &oi->oc, (u64)newsize);
if (likely(!ret))
truncate_setsize(inode, newsize);
@ -927,14 +1060,14 @@ static int exofs_get_inode(struct super_block *sb, struct exofs_i_info *oi,
struct exofs_on_disk_inode_layout *layout;
int ret;
ret = ore_get_io_state(&sbi->layout, &oi->comps, &ios);
ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios);
if (unlikely(ret)) {
EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__);
return ret;
}
attrs[1].len = exofs_on_disk_inode_layout_size(sbi->comps.numdevs);
attrs[2].len = exofs_on_disk_inode_layout_size(sbi->comps.numdevs);
attrs[1].len = exofs_on_disk_inode_layout_size(sbi->oc.numdevs);
attrs[2].len = exofs_on_disk_inode_layout_size(sbi->oc.numdevs);
ios->in_attr = attrs;
ios->in_attr_len = ARRAY_SIZE(attrs);
@ -1018,7 +1151,7 @@ struct inode *exofs_iget(struct super_block *sb, unsigned long ino)
return inode;
oi = exofs_i(inode);
__oi_init(oi);
exofs_init_comps(&oi->comps, &oi->one_comp, sb->s_fs_info,
exofs_init_comps(&oi->oc, &oi->one_comp, sb->s_fs_info,
exofs_oi_objno(oi));
/* read the inode from the osd */
@ -1172,13 +1305,13 @@ struct inode *exofs_new_inode(struct inode *dir, int mode)
spin_unlock(&sbi->s_next_gen_lock);
insert_inode_hash(inode);
exofs_init_comps(&oi->comps, &oi->one_comp, sb->s_fs_info,
exofs_init_comps(&oi->oc, &oi->one_comp, sb->s_fs_info,
exofs_oi_objno(oi));
exofs_sbi_write_stats(sbi); /* Make sure new sbi->s_nextid is on disk */
mark_inode_dirty(inode);
ret = ore_get_io_state(&sbi->layout, &oi->comps, &ios);
ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios);
if (unlikely(ret)) {
EXOFS_ERR("exofs_new_inode: ore_get_io_state failed\n");
return ERR_PTR(ret);
@ -1267,7 +1400,7 @@ static int exofs_update_inode(struct inode *inode, int do_sync)
} else
memcpy(fcb->i_data, oi->i_data, sizeof(fcb->i_data));
ret = ore_get_io_state(&sbi->layout, &oi->comps, &ios);
ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios);
if (unlikely(ret)) {
EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__);
goto free_args;
@ -1350,7 +1483,7 @@ void exofs_evict_inode(struct inode *inode)
/* ignore the error, attempt a remove anyway */
/* Now Remove the OSD objects */
ret = ore_get_io_state(&sbi->layout, &oi->comps, &ios);
ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios);
if (unlikely(ret)) {
EXOFS_ERR("%s: ore_get_io_state failed\n", __func__);
return;

656
fs/exofs/ore.c
View File

@ -24,76 +24,287 @@
#include <linux/slab.h>
#include <asm/div64.h>
#include <linux/lcm.h>
#include <scsi/osd_ore.h>
#define ORE_ERR(fmt, a...) printk(KERN_ERR "ore: " fmt, ##a)
#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
/* u64 has problems with printk this will cast it to unsigned long long */
#define _LLU(x) (unsigned long long)(x)
#define ORE_DBGMSG2(M...) do {} while (0)
/* #define ORE_DBGMSG2 ORE_DBGMSG */
#include "ore_raid.h"
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.
*/
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;
switch (layout->raid_algorithm) {
case PNFS_OSD_RAID_0:
layout->parity = 0;
break;
case PNFS_OSD_RAID_5:
layout->parity = 1;
break;
case PNFS_OSD_RAID_PQ:
case PNFS_OSD_RAID_4:
default:
ORE_ERR("Only RAID_0/5 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;
if (layout->parity) {
unsigned stripe_length =
(layout->group_width - layout->parity) *
layout->stripe_unit;
layout->max_io_length /= stripe_length;
layout->max_io_length *= stripe_length;
}
return 0;
}
EXPORT_SYMBOL(ore_verify_layout);
static u8 *_ios_cred(struct ore_io_state *ios, unsigned index)
{
return ios->comps->comps[index & ios->comps->single_comp].cred;
return ios->oc->comps[index & ios->oc->single_comp].cred;
}
static struct osd_obj_id *_ios_obj(struct ore_io_state *ios, unsigned index)
{
return &ios->comps->comps[index & ios->comps->single_comp].obj;
return &ios->oc->comps[index & ios->oc->single_comp].obj;
}
static struct osd_dev *_ios_od(struct ore_io_state *ios, unsigned index)
{
return ios->comps->ods[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);
}
int ore_get_rw_state(struct ore_layout *layout, struct ore_components *comps,
bool is_reading, u64 offset, u64 length,
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;
/*TODO: Maybe use kmem_cach per sbi of size
* exofs_io_state_size(layout->s_numdevs)
*/
ios = kzalloc(ore_io_state_size(comps->numdevs), GFP_KERNEL);
if (unlikely(!ios)) {
ORE_DBGMSG("Failed kzalloc bytes=%d\n",
ore_io_state_size(comps->numdevs));
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;
}
ios->layout = layout;
ios->comps = comps;
ios->offset = offset;
ios->length = length;
ios->reading = is_reading;
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;
ios->oc = oc;
*pios = ios;
return 0;
}
/* Allocate an io_state for only a single group of devices
*
* If a user needs to call ore_read/write() this version must be used becase it
* allocates extra stuff for striping and raid.
* The ore might decide to only IO less then @length bytes do to alignmets
* and constrains as follows:
* - The IO cannot cross group boundary.
* - In raid5/6 The end of the IO must align at end of a stripe eg.
* (@offset + @length) % strip_size == 0. Or the complete range is within a
* single stripe.
* - Memory condition only permitted a shorter IO. (A user can use @length=~0
* And check the returned ios->length for max_io_size.)
*
* The caller must check returned ios->length (and/or ios->nr_pages) and
* re-issue these pages that fall outside of ios->length
*/
int ore_get_rw_state(struct ore_layout *layout, struct ore_components *oc,
bool is_reading, u64 offset, u64 length,
struct ore_io_state **pios)
{
struct ore_io_state *ios;
unsigned numdevs = layout->group_width * layout->mirrors_p1;
unsigned sgs_per_dev = 0, max_par_pages = 0;
int ret;
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 = *pios;
ios->reading = is_reading;
ios->offset = offset;
if (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;
}
EXPORT_SYMBOL(ore_get_rw_state);
int ore_get_io_state(struct ore_layout *layout, struct ore_components *comps,
struct ore_io_state **ios)
/* Allocate an io_state for all the devices in the comps array
*
* This version of io_state allocation is used mostly by create/remove
* and trunc where we currently need all the devices. The only wastful
* bit is the read/write_attributes with no IO. Those sites should
* be converted to use ore_get_rw_state() with length=0
*/
int ore_get_io_state(struct ore_layout *layout, struct ore_components *oc,
struct ore_io_state **pios)
{
return ore_get_rw_state(layout, comps, true, 0, 0, ios);
return _ore_get_io_state(layout, oc, oc->numdevs, 0, 0, pios);
}
EXPORT_SYMBOL(ore_get_io_state);
@ -111,6 +322,7 @@ void ore_put_io_state(struct ore_io_state *ios)
bio_put(per_dev->bio);
}
_ore_free_raid_stuff(ios);
kfree(ios);
}
}
@ -138,7 +350,7 @@ static void _done_io(struct osd_request *or, void *p)
kref_put(&ios->kref, _last_io);
}
static int ore_io_execute(struct ore_io_state *ios)
int ore_io_execute(struct ore_io_state *ios)
{
DECLARE_COMPLETION_ONSTACK(wait);
bool sync = (ios->done == NULL);
@ -198,7 +410,7 @@ static void _clear_bio(struct bio *bio)
}
}
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;
@ -206,7 +418,8 @@ int ore_check_io(struct ore_io_state *ios, u64 *resid)
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))
@ -218,29 +431,31 @@ int ore_check_io(struct ore_io_state *ios, u64 *resid)
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);
@ -248,61 +463,65 @@ 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)
*/
struct _striping_info {
u64 obj_offset;
u64 group_length;
u64 M; /* for truncate */
unsigned dev;
unsigned unit_off;
};
static void _calc_stripe_info(struct ore_layout *layout, u64 file_offset,
struct _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);
@ -318,39 +537,65 @@ static void _calc_stripe_info(struct ore_layout *layout, u64 file_offset,
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;
si->M = M;
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;
}
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)
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);
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 =
osd_request_queue(_ios_od(ios, per_dev->dev));
per_dev->length += cur_len;
unsigned len = cur_len;
int ret;
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) /
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)) {
ORE_DBGMSG("Failed to allocate BIO size=%u\n",
bio_size);
return -ENOMEM;
ret = -ENOMEM;
goto out;
}
}
@ -358,64 +603,90 @@ static int _add_stripe_unit(struct ore_io_state *ios, unsigned *cur_pg,
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))
return -ENOMEM;
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;
}
_add_stripe_page(ios->sp2d, &ios->si, pages[pg]);
pgbase = 0;
++pg;
}
BUG_ON(cur_len);
per_dev->length += len;
*cur_pg = pg;
ret = 0;
out: /* we fail the complete unit on an error eg don't advance
* per_dev->length and cur_pg. This means that we might have a bigger
* bio than the CDB requested length (per_dev->length). That's fine
* only the oposite is fatal.
*/
return ret;
}
static int _prepare_for_striping(struct ore_io_state *ios)
{
struct ore_striping_info *si = &ios->si;
unsigned stripe_unit = ios->layout->stripe_unit;
unsigned mirrors_p1 = ios->layout->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;
if (!ios->pages) {
ios->numdevs = ios->layout->mirrors_p1;
return 0;
}
static int _prepare_one_group(struct ore_io_state *ios, u64 length,
struct _striping_info *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 dev = si->dev;
unsigned first_dev = dev - (dev % devs_in_group);
unsigned max_comp = ios->numdevs ? ios->numdevs - mirrors_p1 : 0;
unsigned cur_pg = ios->pages_consumed;
int ret = 0;
BUG_ON(length > si->length);
dev_order = _dev_order(devs_in_group, mirrors_p1, si->par_dev, dev);
si->cur_comp = dev_order;
si->cur_pg = si->unit_off / PAGE_SIZE;
while (length) {
struct ore_per_dev_state *per_dev = &ios->per_dev[dev];
unsigned comp = dev - first_dev;
struct ore_per_dev_state *per_dev = &ios->per_dev[comp];
unsigned cur_len, page_off = 0;
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;
}
if (max_comp < dev)
max_comp = dev;
} else {
cur_len = stripe_unit;
}
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;
@ -423,60 +694,60 @@ static int _prepare_one_group(struct ore_io_state *ios, u64 length,
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->sp2d))) {
if (!length && ios->sp2d) {
/* If we are writing and this is the very last
* stripe. then operate on parity dev.
*/
dev = si->par_dev;
}
out:
ios->numdevs = max_comp + mirrors_p1;
ios->pages_consumed = cur_pg;
return ret;
if (ios->sp2d)
/* 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;
}
static int _prepare_for_striping(struct ore_io_state *ios)
{
u64 length = ios->length;
u64 offset = ios->offset;
struct _striping_info si;
int ret = 0;
if (!ios->pages) {
if (ios->kern_buff) {
struct ore_per_dev_state *per_dev = &ios->per_dev[0];
_calc_stripe_info(ios->layout, ios->offset, &si);
per_dev->offset = si.obj_offset;
per_dev->dev = si.dev;
/* no cross device without page array */
BUG_ON((ios->layout->group_width > 1) &&
(si.unit_off + ios->length >
ios->layout->stripe_unit));
}
ios->numdevs = ios->layout->mirrors_p1;
return 0;
}
while (length) {
_calc_stripe_info(ios->layout, offset, &si);
if (length < si.group_length)
si.group_length = length;
ret = _prepare_one_group(ios, si.group_length, &si);
ret = _ore_add_parity_unit(ios, si, per_dev, cur_len);
if (unlikely(ret))
goto out;
offset += si.group_length;
length -= si.group_length;
/* 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;
si->cur_pg = 0;
}
}
out:
ios->numdevs = devs_in_group;
ios->pages_consumed = cur_pg;
if (unlikely(ret)) {
if (length == ios->length)
return ret;
else
ios->length -= length;
}
return 0;
}
int ore_create(struct ore_io_state *ios)
{
int i, ret;
for (i = 0; i < ios->comps->numdevs; i++) {
for (i = 0; i < ios->oc->numdevs; i++) {
struct osd_request *or;
or = osd_start_request(_ios_od(ios, i), GFP_KERNEL);
@ -501,7 +772,7 @@ int ore_remove(struct ore_io_state *ios)
{
int i, ret;
for (i = 0; i < ios->comps->numdevs; i++) {
for (i = 0; i < ios->oc->numdevs; i++) {
struct osd_request *or;
or = osd_start_request(_ios_od(ios, i), GFP_KERNEL);
@ -543,7 +814,6 @@ static int _write_mirror(struct ore_io_state *ios, int cur_comp)
goto out;
}
per_dev->or = or;
per_dev->offset = master_dev->offset;
if (ios->pages) {
struct bio *bio;
@ -562,6 +832,7 @@ static int _write_mirror(struct ore_io_state *ios, int cur_comp)
__bio_clone(bio, master_dev->bio);
bio->bi_bdev = NULL;
bio->bi_next = NULL;
per_dev->offset = master_dev->offset;
per_dev->length = master_dev->length;
per_dev->bio = bio;
per_dev->dev = dev;
@ -579,7 +850,15 @@ static int _write_mirror(struct ore_io_state *ios, int cur_comp)
_LLU(per_dev->offset),
_LLU(per_dev->length), dev);
} else if (ios->kern_buff) {
ret = osd_req_write_kern(or, _ios_obj(ios, dev),
per_dev->offset = ios->si.obj_offset;
per_dev->dev = ios->si.dev + dev;
/* no cross device without page array */
BUG_ON((ios->layout->group_width > 1) &&
(ios->si.unit_off + ios->length >
ios->layout->stripe_unit));
ret = osd_req_write_kern(or, _ios_obj(ios, per_dev->dev),
per_dev->offset,
ios->kern_buff, ios->length);
if (unlikely(ret))
@ -588,7 +867,7 @@ static int _write_mirror(struct ore_io_state *ios, int cur_comp)
"length=0x%llx dev=%d\n",
_LLU(_ios_obj(ios, dev)->id),
_LLU(per_dev->offset),
_LLU(ios->length), dev);
_LLU(ios->length), per_dev->dev);
} else {
osd_req_set_attributes(or, _ios_obj(ios, dev));
ORE_DBGMSG2("obj(0x%llx) set_attributes=%d dev=%d\n",
@ -614,6 +893,14 @@ int ore_write(struct ore_io_state *ios)
int i;
int ret;
if (unlikely(ios->sp2d && !ios->r4w)) {
/* A library is attempting a RAID-write without providing
* a pages lock interface.
*/
WARN_ON_ONCE(1);
return -ENOTSUPP;
}
ret = _prepare_for_striping(ios);
if (unlikely(ret))
return ret;
@ -629,7 +916,7 @@ int ore_write(struct ore_io_state *ios)
}
EXPORT_SYMBOL(ore_write);
static int _read_mirror(struct ore_io_state *ios, unsigned cur_comp)
int _ore_read_mirror(struct ore_io_state *ios, unsigned cur_comp)
{
struct osd_request *or;
struct ore_per_dev_state *per_dev = &ios->per_dev[cur_comp];
@ -648,22 +935,27 @@ static int _read_mirror(struct ore_io_state *ios, unsigned cur_comp)
per_dev->or = or;
if (ios->pages) {
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);
} else if (ios->kern_buff) {
int ret = osd_req_read_kern(or, obj, per_dev->offset,
ios->kern_buff, ios->length);
ORE_DBGMSG2("read_kern(0x%llx) offset=0x%llx "
"length=0x%llx dev=%d ret=>%d\n",
_LLU(obj->id), _LLU(per_dev->offset),
_LLU(ios->length), first_dev, ret);
if (unlikely(ret))
return ret;
first_dev, per_dev->cur_sg);
} else {
BUG_ON(ios->kern_buff);
osd_req_get_attributes(or, obj);
ORE_DBGMSG2("obj(0x%llx) get_attributes=%d dev=%d\n",
_LLU(obj->id),
@ -688,7 +980,7 @@ int ore_read(struct ore_io_state *ios)
return ret;
for (i = 0; i < ios->numdevs; i += ios->layout->mirrors_p1) {
ret = _read_mirror(ios, i);
ret = _ore_read_mirror(ios, i);
if (unlikely(ret))
return ret;
}
@ -744,31 +1036,29 @@ static int _truncate_mirrors(struct ore_io_state *ios, unsigned cur_comp,
}
struct _trunc_info {
struct _striping_info si;
struct ore_striping_info si;
u64 prev_group_obj_off;
u64 next_group_obj_off;
unsigned first_group_dev;
unsigned nex_group_dev;
unsigned max_devs;
};
void _calc_trunk_info(struct ore_layout *layout, u64 file_offset,
static void _calc_trunk_info(struct ore_layout *layout, u64 file_offset,
struct _trunc_info *ti)
{
unsigned stripe_unit = layout->stripe_unit;
_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;
ti->first_group_dev = ti->si.dev - (ti->si.dev % layout->group_width);
ti->nex_group_dev = ti->first_group_dev + layout->group_width;
ti->max_devs = layout->group_width * layout->group_count;
}
int ore_truncate(struct ore_layout *layout, struct ore_components *comps,
int ore_truncate(struct ore_layout *layout, struct ore_components *oc,
u64 size)
{
struct ore_io_state *ios;
@ -779,22 +1069,22 @@ int ore_truncate(struct ore_layout *layout, struct ore_components *comps,
struct _trunc_info ti;
int i, ret;
ret = ore_get_io_state(layout, comps, &ios);
ret = ore_get_io_state(layout, oc, &ios);
if (unlikely(ret))
return ret;
_calc_trunk_info(ios->layout, size, &ti);
size_attrs = kcalloc(ti.max_devs, sizeof(*size_attrs),
size_attrs = kcalloc(ios->oc->numdevs, sizeof(*size_attrs),
GFP_KERNEL);
if (unlikely(!size_attrs)) {
ret = -ENOMEM;
goto out;
}
ios->numdevs = ios->comps->numdevs;
ios->numdevs = ios->oc->numdevs;
for (i = 0; i < ti.max_devs; ++i) {
for (i = 0; i < ios->numdevs; ++i) {
struct exofs_trunc_attr *size_attr = &size_attrs[i];
u64 obj_size;
@ -815,7 +1105,7 @@ int ore_truncate(struct ore_layout *layout, struct ore_components *comps,
size_attr->attr.val_ptr = &size_attr->newsize;
ORE_DBGMSG("trunc(0x%llx) obj_offset=0x%llx dev=%d\n",
_LLU(comps->comps->obj.id), _LLU(obj_size), i);
_LLU(oc->comps->obj.id), _LLU(obj_size), i);
ret = _truncate_mirrors(ios, i * ios->layout->mirrors_p1,
&size_attr->attr);
if (unlikely(ret))

660
fs/exofs/ore_raid.c Normal file
View File

@ -0,0 +1,660 @@
/*
* Copyright (C) 2011
* Boaz Harrosh <bharrosh@panasas.com>
*
* This file is part of the objects raid engine (ore).
*
* It is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*
* You should have received a copy of the GNU General Public License
* along with "ore". If not, write to the Free Software Foundation, Inc:
* "Free Software Foundation <info@fsf.org>"
*/
#include <linux/gfp.h>
#include <linux/async_tx.h>
#include "ore_raid.h"
#undef ORE_DBGMSG2
#define ORE_DBGMSG2 ORE_DBGMSG
struct page *_raid_page_alloc(void)
{
return alloc_page(GFP_KERNEL);
}
void _raid_page_free(struct page *p)
{
__free_page(p);
}
/* This struct is forward declare in ore_io_state, but is private to here.
* It is put on ios->sp2d for RAID5/6 writes only. See _gen_xor_unit.
*
* __stripe_pages_2d is a 2d array of pages, and it is also a corner turn.
* Ascending page index access is sp2d(p-minor, c-major). But storage is
* sp2d[p-minor][c-major], so it can be properlly presented to the async-xor
* API.
*/
struct __stripe_pages_2d {
/* Cache some hot path repeated calculations */
unsigned parity;
unsigned data_devs;
unsigned pages_in_unit;
bool needed ;
/* Array size is pages_in_unit (layout->stripe_unit / PAGE_SIZE) */
struct __1_page_stripe {
bool alloc;
unsigned write_count;
struct async_submit_ctl submit;
struct dma_async_tx_descriptor *tx;
/* The size of this array is data_devs + parity */
struct page **pages;
struct page **scribble;
/* bool array, size of this array is data_devs */
char *page_is_read;
} _1p_stripes[];
};
/* This can get bigger then a page. So support multiple page allocations
* _sp2d_free should be called even if _sp2d_alloc fails (by returning
* none-zero).
*/
static int _sp2d_alloc(unsigned pages_in_unit, unsigned group_width,
unsigned parity, struct __stripe_pages_2d **psp2d)
{
struct __stripe_pages_2d *sp2d;
unsigned data_devs = group_width - parity;
struct _alloc_all_bytes {
struct __alloc_stripe_pages_2d {
struct __stripe_pages_2d sp2d;
struct __1_page_stripe _1p_stripes[pages_in_unit];
} __asp2d;
struct __alloc_1p_arrays {
struct page *pages[group_width];
struct page *scribble[group_width];
char page_is_read[data_devs];
} __a1pa[pages_in_unit];
} *_aab;
struct __alloc_1p_arrays *__a1pa;
struct __alloc_1p_arrays *__a1pa_end;
const unsigned sizeof__a1pa = sizeof(_aab->__a1pa[0]);
unsigned num_a1pa, alloc_size, i;
/* FIXME: check these numbers in ore_verify_layout */
BUG_ON(sizeof(_aab->__asp2d) > PAGE_SIZE);
BUG_ON(sizeof__a1pa > PAGE_SIZE);
if (sizeof(*_aab) > PAGE_SIZE) {
num_a1pa = (PAGE_SIZE - sizeof(_aab->__asp2d)) / sizeof__a1pa;
alloc_size = sizeof(_aab->__asp2d) + sizeof__a1pa * num_a1pa;
} else {
num_a1pa = pages_in_unit;
alloc_size = sizeof(*_aab);
}
_aab = kzalloc(alloc_size, GFP_KERNEL);
if (unlikely(!_aab)) {
ORE_DBGMSG("!! Failed to alloc sp2d size=%d\n", alloc_size);
return -ENOMEM;
}
sp2d = &_aab->__asp2d.sp2d;
*psp2d = sp2d; /* From here Just call _sp2d_free */
__a1pa = _aab->__a1pa;
__a1pa_end = __a1pa + num_a1pa;
for (i = 0; i < pages_in_unit; ++i) {
if (unlikely(__a1pa >= __a1pa_end)) {
num_a1pa = min_t(unsigned, PAGE_SIZE / sizeof__a1pa,
pages_in_unit - i);
__a1pa = kzalloc(num_a1pa * sizeof__a1pa, GFP_KERNEL);
if (unlikely(!__a1pa)) {
ORE_DBGMSG("!! Failed to _alloc_1p_arrays=%d\n",
num_a1pa);
return -ENOMEM;
}
__a1pa_end = __a1pa + num_a1pa;
/* First *pages is marked for kfree of the buffer */
sp2d->_1p_stripes[i].alloc = true;
}
sp2d->_1p_stripes[i].pages = __a1pa->pages;
sp2d->_1p_stripes[i].scribble = __a1pa->scribble ;
sp2d->_1p_stripes[i].page_is_read = __a1pa->page_is_read;
++__a1pa;
}
sp2d->parity = parity;
sp2d->data_devs = data_devs;
sp2d->pages_in_unit = pages_in_unit;
return 0;
}
static void _sp2d_reset(struct __stripe_pages_2d *sp2d,
const struct _ore_r4w_op *r4w, void *priv)
{
unsigned data_devs = sp2d->data_devs;
unsigned group_width = data_devs + sp2d->parity;
unsigned p;
if (!sp2d->needed)
return;
for (p = 0; p < sp2d->pages_in_unit; p++) {
struct __1_page_stripe *_1ps = &sp2d->_1p_stripes[p];
if (_1ps->write_count < group_width) {
unsigned c;
for (c = 0; c < data_devs; c++)
if (_1ps->page_is_read[c]) {
struct page *page = _1ps->pages[c];
r4w->put_page(priv, page);
_1ps->page_is_read[c] = false;
}
}
memset(_1ps->pages, 0, group_width * sizeof(*_1ps->pages));
_1ps->write_count = 0;
_1ps->tx = NULL;
}
sp2d->needed = false;
}
static void _sp2d_free(struct __stripe_pages_2d *sp2d)
{
unsigned i;
if (!sp2d)
return;
for (i = 0; i < sp2d->pages_in_unit; ++i) {
if (sp2d->_1p_stripes[i].alloc)
kfree(sp2d->_1p_stripes[i].pages);
}
kfree(sp2d);
}
static unsigned _sp2d_min_pg(struct __stripe_pages_2d *sp2d)
{
unsigned p;
for (p = 0; p < sp2d->pages_in_unit; p++) {
struct __1_page_stripe *_1ps = &sp2d->_1p_stripes[p];
if (_1ps->write_count)
return p;
}
return ~0;
}
static unsigned _sp2d_max_pg(struct __stripe_pages_2d *sp2d)
{
unsigned p;
for (p = sp2d->pages_in_unit - 1; p >= 0; --p) {
struct __1_page_stripe *_1ps = &sp2d->_1p_stripes[p];
if (_1ps->write_count)
return p;
}
return ~0;
}
static void _gen_xor_unit(struct __stripe_pages_2d *sp2d)
{
unsigned p;
for (p = 0; p < sp2d->pages_in_unit; p++) {
struct __1_page_stripe *_1ps = &sp2d->_1p_stripes[p];
if (!_1ps->write_count)
continue;
init_async_submit(&_1ps->submit,
ASYNC_TX_XOR_ZERO_DST | ASYNC_TX_ACK,
NULL,
NULL, NULL,
(addr_conv_t *)_1ps->scribble);
/* TODO: raid6 */
_1ps->tx = async_xor(_1ps->pages[sp2d->data_devs], _1ps->pages,
0, sp2d->data_devs, PAGE_SIZE,
&_1ps->submit);
}
for (p = 0; p < sp2d->pages_in_unit; p++) {
struct __1_page_stripe *_1ps = &sp2d->_1p_stripes[p];
/* NOTE: We wait for HW synchronously (I don't have such HW
* to test with.) Is parallelism needed with today's multi
* cores?
*/
async_tx_issue_pending(_1ps->tx);
}
}
void _ore_add_stripe_page(struct __stripe_pages_2d *sp2d,
struct ore_striping_info *si, struct page *page)
{
struct __1_page_stripe *_1ps;
sp2d->needed = true;
_1ps = &sp2d->_1p_stripes[si->cur_pg];
_1ps->pages[si->cur_comp] = page;
++_1ps->write_count;
si->cur_pg = (si->cur_pg + 1) % sp2d->pages_in_unit;
/* si->cur_comp is advanced outside at main loop */
}
void _ore_add_sg_seg(struct ore_per_dev_state *per_dev, unsigned cur_len,
bool not_last)
{
struct osd_sg_entry *sge;
ORE_DBGMSG("dev=%d cur_len=0x%x not_last=%d cur_sg=%d "
"offset=0x%llx length=0x%x last_sgs_total=0x%x\n",
per_dev->dev, cur_len, not_last, per_dev->cur_sg,
_LLU(per_dev->offset), per_dev->length,
per_dev->last_sgs_total);
if (!per_dev->cur_sg) {
sge = per_dev->sglist;
/* First time we prepare two entries */
if (per_dev->length) {
++per_dev->cur_sg;
sge->offset = per_dev->offset;
sge->len = per_dev->length;
} else {
/* Here the parity is the first unit of this object.
* This happens every time we reach a parity device on
* the same stripe as the per_dev->offset. We need to
* just skip this unit.
*/
per_dev->offset += cur_len;
return;
}
} else {
/* finalize the last one */
sge = &per_dev->sglist[per_dev->cur_sg - 1];
sge->len = per_dev->length - per_dev->last_sgs_total;
}
if (not_last) {
/* Partly prepare the next one */
struct osd_sg_entry *next_sge = sge + 1;
++per_dev->cur_sg;
next_sge->offset = sge->offset + sge->len + cur_len;
/* Save cur len so we know how mutch was added next time */
per_dev->last_sgs_total = per_dev->length;
next_sge->len = 0;
} else if (!sge->len) {
/* Optimize for when the last unit is a parity */
--per_dev->cur_sg;
}
}
static int _alloc_read_4_write(struct ore_io_state *ios)
{
struct ore_layout *layout = ios->layout;
int ret;
/* We want to only read those pages not in cache so worst case
* is a stripe populated with every other page
*/
unsigned sgs_per_dev = ios->sp2d->pages_in_unit + 2;
ret = _ore_get_io_state(layout, ios->oc,
layout->group_width * layout->mirrors_p1,
sgs_per_dev, 0, &ios->ios_read_4_write);
return ret;
}
/* @si contains info of the to-be-inserted page. Update of @si should be
* maintained by caller. Specificaly si->dev, si->obj_offset, ...
*/
static int _add_to_read_4_write(struct ore_io_state *ios,
struct ore_striping_info *si, struct page *page)
{
struct request_queue *q;
struct ore_per_dev_state *per_dev;
struct ore_io_state *read_ios;
unsigned first_dev = si->dev - (si->dev %
(ios->layout->group_width * ios->layout->mirrors_p1));
unsigned comp = si->dev - first_dev;
unsigned added_len;
if (!ios->ios_read_4_write) {
int ret = _alloc_read_4_write(ios);
if (unlikely(ret))
return ret;
}
read_ios = ios->ios_read_4_write;
read_ios->numdevs = ios->layout->group_width * ios->layout->mirrors_p1;
per_dev = &read_ios->per_dev[comp];
if (!per_dev->length) {
per_dev->bio = bio_kmalloc(GFP_KERNEL,
ios->sp2d->pages_in_unit);
if (unlikely(!per_dev->bio)) {
ORE_DBGMSG("Failed to allocate BIO size=%u\n",
ios->sp2d->pages_in_unit);
return -ENOMEM;
}
per_dev->offset = si->obj_offset;
per_dev->dev = si->dev;
} else if (si->obj_offset != (per_dev->offset + per_dev->length)) {
u64 gap = si->obj_offset - (per_dev->offset + per_dev->length);
_ore_add_sg_seg(per_dev, gap, true);
}
q = osd_request_queue(ore_comp_dev(read_ios->oc, per_dev->dev));
added_len = bio_add_pc_page(q, per_dev->bio, page, PAGE_SIZE, 0);
if (unlikely(added_len != PAGE_SIZE)) {
ORE_DBGMSG("Failed to bio_add_pc_page bi_vcnt=%d\n",
per_dev->bio->bi_vcnt);
return -ENOMEM;
}
per_dev->length += PAGE_SIZE;
return 0;
}
static void _mark_read4write_pages_uptodate(struct ore_io_state *ios, int ret)
{
struct bio_vec *bv;
unsigned i, d;
/* loop on all devices all pages */
for (d = 0; d < ios->numdevs; d++) {
struct bio *bio = ios->per_dev[d].bio;
if (!bio)
continue;
__bio_for_each_segment(bv, bio, i, 0) {
struct page *page = bv->bv_page;
SetPageUptodate(page);
if (PageError(page))
ClearPageError(page);
}
}
}
/* read_4_write is hacked to read the start of the first stripe and/or
* the end of the last stripe. If needed, with an sg-gap at each device/page.
* It is assumed to be called after the to_be_written pages of the first stripe
* are populating ios->sp2d[][]
*
* NOTE: We call ios->r4w->lock_fn for all pages needed for parity calculations
* These pages are held at sp2d[p].pages[c] but with
* sp2d[p].page_is_read[c] = true. At _sp2d_reset these pages are
* ios->r4w->lock_fn(). The ios->r4w->lock_fn might signal that the page is
* @uptodate=true, so we don't need to read it, only unlock, after IO.
*
* TODO: The read_4_write should calc a need_to_read_pages_count, if bigger then
* to-be-written count, we should consider the xor-in-place mode.
* need_to_read_pages_count is the actual number of pages not present in cache.
* maybe "devs_in_group - ios->sp2d[p].write_count" is a good enough
* approximation? In this mode the read pages are put in the empty places of
* ios->sp2d[p][*], xor is calculated the same way. These pages are
* allocated/freed and don't go through cache
*/
static int _read_4_write(struct ore_io_state *ios)
{
struct ore_io_state *ios_read;
struct ore_striping_info read_si;
struct __stripe_pages_2d *sp2d = ios->sp2d;
u64 offset = ios->si.first_stripe_start;
u64 last_stripe_end;
unsigned bytes_in_stripe = ios->si.bytes_in_stripe;
unsigned i, c, p, min_p = sp2d->pages_in_unit, max_p = -1;
int ret;
if (offset == ios->offset) /* Go to start collect $200 */
goto read_last_stripe;
min_p = _sp2d_min_pg(sp2d);
max_p = _sp2d_max_pg(sp2d);
for (c = 0; ; c++) {
ore_calc_stripe_info(ios->layout, offset, 0, &read_si);
read_si.obj_offset += min_p * PAGE_SIZE;
offset += min_p * PAGE_SIZE;
for (p = min_p; p <= max_p; p++) {
struct __1_page_stripe *_1ps = &sp2d->_1p_stripes[p];
struct page **pp = &_1ps->pages[c];
bool uptodate;
if (*pp)
/* to-be-written pages start here */
goto read_last_stripe;
*pp = ios->r4w->get_page(ios->private, offset,
&uptodate);
if (unlikely(!*pp))
return -ENOMEM;
if (!uptodate)
_add_to_read_4_write(ios, &read_si, *pp);
/* Mark read-pages to be cache_released */
_1ps->page_is_read[c] = true;
read_si.obj_offset += PAGE_SIZE;
offset += PAGE_SIZE;
}
offset += (sp2d->pages_in_unit - p) * PAGE_SIZE;
}
read_last_stripe:
offset = ios->offset + (ios->length + PAGE_SIZE - 1) /
PAGE_SIZE * PAGE_SIZE;
last_stripe_end = div_u64(offset + bytes_in_stripe - 1, bytes_in_stripe)
* bytes_in_stripe;
if (offset == last_stripe_end) /* Optimize for the aligned case */
goto read_it;
ore_calc_stripe_info(ios->layout, offset, 0, &read_si);
p = read_si.unit_off / PAGE_SIZE;
c = _dev_order(ios->layout->group_width * ios->layout->mirrors_p1,
ios->layout->mirrors_p1, read_si.par_dev, read_si.dev);
BUG_ON(ios->si.first_stripe_start + bytes_in_stripe != last_stripe_end);
/* unaligned IO must be within a single stripe */
if (min_p == sp2d->pages_in_unit) {
/* Didn't do it yet */
min_p = _sp2d_min_pg(sp2d);
max_p = _sp2d_max_pg(sp2d);
}
while (offset < last_stripe_end) {
struct __1_page_stripe *_1ps = &sp2d->_1p_stripes[p];
if ((min_p <= p) && (p <= max_p)) {
struct page *page;
bool uptodate;
BUG_ON(_1ps->pages[c]);
page = ios->r4w->get_page(ios->private, offset,
&uptodate);
if (unlikely(!page))
return -ENOMEM;
_1ps->pages[c] = page;
/* Mark read-pages to be cache_released */
_1ps->page_is_read[c] = true;
if (!uptodate)
_add_to_read_4_write(ios, &read_si, page);
}
offset += PAGE_SIZE;
if (p == (sp2d->pages_in_unit - 1)) {
++c;
p = 0;
ore_calc_stripe_info(ios->layout, offset, 0, &read_si);
} else {
read_si.obj_offset += PAGE_SIZE;
++p;
}
}
read_it:
ios_read = ios->ios_read_4_write;
if (!ios_read)
return 0;
/* FIXME: Ugly to signal _sbi_read_mirror that we have bio(s). Change
* to check for per_dev->bio
*/
ios_read->pages = ios->pages;
/* Now read these devices */
for (i = 0; i < ios_read->numdevs; i += ios_read->layout->mirrors_p1) {
ret = _ore_read_mirror(ios_read, i);
if (unlikely(ret))
return ret;
}
ret = ore_io_execute(ios_read); /* Synchronus execution */
if (unlikely(ret)) {
ORE_DBGMSG("!! ore_io_execute => %d\n", ret);
return ret;
}
_mark_read4write_pages_uptodate(ios_read, ret);
return 0;
}
/* In writes @cur_len means length left. .i.e cur_len==0 is the last parity U */
int _ore_add_parity_unit(struct ore_io_state *ios,
struct ore_striping_info *si,
struct ore_per_dev_state *per_dev,
unsigned cur_len)
{
if (ios->reading) {
BUG_ON(per_dev->cur_sg >= ios->sgs_per_dev);
_ore_add_sg_seg(per_dev, cur_len, true);
} else {
struct __stripe_pages_2d *sp2d = ios->sp2d;
struct page **pages = ios->parity_pages + ios->cur_par_page;
unsigned num_pages;
unsigned array_start = 0;
unsigned i;
int ret;
si->cur_pg = _sp2d_min_pg(sp2d);
num_pages = _sp2d_max_pg(sp2d) + 1 - si->cur_pg;
if (!cur_len) /* If last stripe operate on parity comp */
si->cur_comp = sp2d->data_devs;
if (!per_dev->length) {
per_dev->offset += si->cur_pg * PAGE_SIZE;
/* If first stripe, Read in all read4write pages
* (if needed) before we calculate the first parity.
*/
_read_4_write(ios);
}
for (i = 0; i < num_pages; i++) {
pages[i] = _raid_page_alloc();
if (unlikely(!pages[i]))
return -ENOMEM;
++(ios->cur_par_page);
}
BUG_ON(si->cur_comp != sp2d->data_devs);
BUG_ON(si->cur_pg + num_pages > sp2d->pages_in_unit);
ret = _ore_add_stripe_unit(ios, &array_start, 0, pages,
per_dev, num_pages * PAGE_SIZE);
if (unlikely(ret))
return ret;
/* TODO: raid6 if (last_parity_dev) */
_gen_xor_unit(sp2d);
_sp2d_reset(sp2d, ios->r4w, ios->private);
}
return 0;
}
int _ore_post_alloc_raid_stuff(struct ore_io_state *ios)
{
struct ore_layout *layout = ios->layout;
if (ios->parity_pages) {
unsigned pages_in_unit = layout->stripe_unit / PAGE_SIZE;
unsigned stripe_size = ios->si.bytes_in_stripe;
u64 last_stripe, first_stripe;
if (_sp2d_alloc(pages_in_unit, layout->group_width,
layout->parity, &ios->sp2d)) {
return -ENOMEM;
}
BUG_ON(ios->offset % PAGE_SIZE);
/* Round io down to last full strip */
first_stripe = div_u64(ios->offset, stripe_size);
last_stripe = div_u64(ios->offset + ios->length, stripe_size);
/* If an IO spans more then a single stripe it must end at
* a stripe boundary. The reminder at the end is pushed into the
* next IO.
*/
if (last_stripe != first_stripe) {
ios->length = last_stripe * stripe_size - ios->offset;
BUG_ON(!ios->length);
ios->nr_pages = (ios->length + PAGE_SIZE - 1) /
PAGE_SIZE;
ios->si.length = ios->length; /*make it consistent */
}
}
return 0;
}
void _ore_free_raid_stuff(struct ore_io_state *ios)
{
if (ios->sp2d) { /* writing and raid */
unsigned i;
for (i = 0; i < ios->cur_par_page; i++) {
struct page *page = ios->parity_pages[i];
if (page)
_raid_page_free(page);
}
if (ios->extra_part_alloc)
kfree(ios->parity_pages);
/* If IO returned an error pages might need unlocking */
_sp2d_reset(ios->sp2d, ios->r4w, ios->private);
_sp2d_free(ios->sp2d);
} else {
/* Will only be set if raid reading && sglist is big */
if (ios->extra_part_alloc)
kfree(ios->per_dev[0].sglist);
}
if (ios->ios_read_4_write)
ore_put_io_state(ios->ios_read_4_write);
}

79
fs/exofs/ore_raid.h Normal file
View File

@ -0,0 +1,79 @@
/*
* Copyright (C) from 2011
* Boaz Harrosh <bharrosh@panasas.com>
*
* This file is part of the objects raid engine (ore).
*
* It is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*
* You should have received a copy of the GNU General Public License
* along with "ore". If not, write to the Free Software Foundation, Inc:
* "Free Software Foundation <info@fsf.org>"
*/
#include <scsi/osd_ore.h>
#define ORE_ERR(fmt, a...) printk(KERN_ERR "ore: " fmt, ##a)
#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
/* u64 has problems with printk this will cast it to unsigned long long */
#define _LLU(x) (unsigned long long)(x)
#define ORE_DBGMSG2(M...) do {} while (0)
/* #define ORE_DBGMSG2 ORE_DBGMSG */
/* Calculate the component order in a stripe. eg the logical data unit
* address within the stripe of @dev given the @par_dev of this stripe.
*/
static inline unsigned _dev_order(unsigned devs_in_group, unsigned mirrors_p1,
unsigned par_dev, unsigned dev)
{
unsigned first_dev = dev - dev % devs_in_group;
dev -= first_dev;
par_dev -= first_dev;
if (devs_in_group == par_dev) /* The raid 0 case */
return dev / mirrors_p1;
/* raid4/5/6 case */
return ((devs_in_group + dev - par_dev - mirrors_p1) % devs_in_group) /
mirrors_p1;
}
/* ios_raid.c stuff needed by ios.c */
int _ore_post_alloc_raid_stuff(struct ore_io_state *ios);
void _ore_free_raid_stuff(struct ore_io_state *ios);
void _ore_add_sg_seg(struct ore_per_dev_state *per_dev, unsigned cur_len,
bool not_last);
int _ore_add_parity_unit(struct ore_io_state *ios, struct ore_striping_info *si,
struct ore_per_dev_state *per_dev, unsigned cur_len);
void _ore_add_stripe_page(struct __stripe_pages_2d *sp2d,
struct ore_striping_info *si, struct page *page);
static inline void _add_stripe_page(struct __stripe_pages_2d *sp2d,
struct ore_striping_info *si, struct page *page)
{
if (!sp2d) /* Inline the fast path */
return; /* Hay no raid stuff */
_ore_add_stripe_page(sp2d, si, page);
}
/* ios.c stuff needed by ios_raid.c */
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);
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);
int _ore_read_mirror(struct ore_io_state *ios, unsigned cur_comp);
int ore_io_execute(struct ore_io_state *ios);

203
fs/exofs/super.c
View File

@ -266,7 +266,7 @@ static int __sbi_read_stats(struct exofs_sb_info *sbi)
struct ore_io_state *ios;
int ret;
ret = ore_get_io_state(&sbi->layout, &sbi->comps, &ios);
ret = ore_get_io_state(&sbi->layout, &sbi->oc, &ios);
if (unlikely(ret)) {
EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__);
return ret;
@ -321,7 +321,7 @@ int exofs_sbi_write_stats(struct exofs_sb_info *sbi)
struct ore_io_state *ios;
int ret;
ret = ore_get_io_state(&sbi->layout, &sbi->comps, &ios);
ret = ore_get_io_state(&sbi->layout, &sbi->oc, &ios);
if (unlikely(ret)) {
EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__);
return ret;
@ -355,12 +355,12 @@ static const struct export_operations exofs_export_ops;
/*
* Write the superblock to the OSD
*/
int exofs_sync_fs(struct super_block *sb, int wait)
static int exofs_sync_fs(struct super_block *sb, int wait)
{
struct exofs_sb_info *sbi;
struct exofs_fscb *fscb;
struct ore_comp one_comp;
struct ore_components comps;
struct ore_components oc;
struct ore_io_state *ios;
int ret = -ENOMEM;
@ -378,9 +378,9 @@ int exofs_sync_fs(struct super_block *sb, int wait)
* the writeable info is set in exofs_sbi_write_stats() above.
*/
exofs_init_comps(&comps, &one_comp, sbi, EXOFS_SUPER_ID);
exofs_init_comps(&oc, &one_comp, sbi, EXOFS_SUPER_ID);
ret = ore_get_io_state(&sbi->layout, &comps, &ios);
ret = ore_get_io_state(&sbi->layout, &oc, &ios);
if (unlikely(ret))
goto out;
@ -429,19 +429,20 @@ static void _exofs_print_device(const char *msg, const char *dev_path,
msg, dev_path ?: "", odi->osdname, _LLU(pid));
}
void exofs_free_sbi(struct exofs_sb_info *sbi)
static void exofs_free_sbi(struct exofs_sb_info *sbi)
{
while (sbi->comps.numdevs) {
int i = --sbi->comps.numdevs;
struct osd_dev *od = sbi->comps.ods[i];
unsigned numdevs = sbi->oc.numdevs;
while (numdevs) {
unsigned i = --numdevs;
struct osd_dev *od = ore_comp_dev(&sbi->oc, i);
if (od) {
sbi->comps.ods[i] = NULL;
ore_comp_set_dev(&sbi->oc, i, NULL);
osduld_put_device(od);
}
}
if (sbi->comps.ods != sbi->_min_one_dev)
kfree(sbi->comps.ods);
kfree(sbi->oc.ods);
kfree(sbi);
}
@ -468,7 +469,7 @@ static void exofs_put_super(struct super_block *sb)
msecs_to_jiffies(100));
}
_exofs_print_device("Unmounting", NULL, sbi->comps.ods[0],
_exofs_print_device("Unmounting", NULL, ore_comp_dev(&sbi->oc, 0),
sbi->one_comp.obj.partition);
bdi_destroy(&sbi->bdi);
@ -479,76 +480,20 @@ 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->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) {
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);
return -EINVAL;
}
if (0 != (sbi->data_map.odm_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);
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_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;
} else {
if (sbi->data_map.odm_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;
}
sbi->layout.group_width = sbi->data_map.odm_num_comps /
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 "
@ -558,8 +503,8 @@ 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);
return 0;
sbi->layout.raid_algorithm);
return ret;
}
static unsigned __ra_pages(struct ore_layout *layout)
@ -605,12 +550,40 @@ static int exofs_devs_2_odi(struct exofs_dt_device_info *dt_dev,
return !(odi->systemid_len || odi->osdname_len);
}
int __alloc_dev_table(struct exofs_sb_info *sbi, unsigned numdevs,
struct exofs_dev **peds)
{
struct __alloc_ore_devs_and_exofs_devs {
/* Twice bigger table: See exofs_init_comps() and comment at
* exofs_read_lookup_dev_table()
*/
struct ore_dev *oreds[numdevs * 2 - 1];
struct exofs_dev eds[numdevs];
} *aoded;
struct exofs_dev *eds;
unsigned i;
aoded = kzalloc(sizeof(*aoded), GFP_KERNEL);
if (unlikely(!aoded)) {
EXOFS_ERR("ERROR: faild allocating Device array[%d]\n",
numdevs);
return -ENOMEM;
}
sbi->oc.ods = aoded->oreds;
*peds = eds = aoded->eds;
for (i = 0; i < numdevs; ++i)
aoded->oreds[i] = &eds[i].ored;
return 0;
}
static int exofs_read_lookup_dev_table(struct exofs_sb_info *sbi,
struct osd_dev *fscb_od,
unsigned table_count)
{
struct ore_comp comp;
struct exofs_device_table *dt;
struct exofs_dev *eds;
unsigned table_bytes = table_count * sizeof(dt->dt_dev_table[0]) +
sizeof(*dt);
unsigned numdevs, i;
@ -623,7 +596,7 @@ static int exofs_read_lookup_dev_table(struct exofs_sb_info *sbi,
return -ENOMEM;
}
sbi->comps.numdevs = 0;
sbi->oc.numdevs = 0;
comp.obj.partition = sbi->one_comp.obj.partition;
comp.obj.id = EXOFS_DEVTABLE_ID;
@ -647,20 +620,16 @@ static int exofs_read_lookup_dev_table(struct exofs_sb_info *sbi,
if (unlikely(ret))
goto out;
if (likely(numdevs > 1)) {
unsigned size = numdevs * sizeof(sbi->comps.ods[0]);
/* Twice bigger table: See exofs_init_comps() and below
* comment
*/
sbi->comps.ods = kzalloc(size + size - 1, GFP_KERNEL);
if (unlikely(!sbi->comps.ods)) {
EXOFS_ERR("ERROR: faild allocating Device array[%d]\n",
numdevs);
ret = -ENOMEM;
ret = __alloc_dev_table(sbi, numdevs, &eds);
if (unlikely(ret))
goto out;
}
}
/* exofs round-robins the device table view according to inode
* number. We hold a: twice bigger table hence inodes can point
* to any device and have a sequential view of the table
* starting at this device. See exofs_init_comps()
*/
memcpy(&sbi->oc.ods[numdevs], &sbi->oc.ods[0],
(numdevs - 1) * sizeof(sbi->oc.ods[0]));
for (i = 0; i < numdevs; i++) {
struct exofs_fscb fscb;
@ -676,13 +645,16 @@ static int exofs_read_lookup_dev_table(struct exofs_sb_info *sbi,
printk(KERN_NOTICE "Add device[%d]: osd_name-%s\n",
i, odi.osdname);
/* the exofs id is currently the table index */
eds[i].did = i;
/* On all devices the device table is identical. The user can
* specify any one of the participating devices on the command
* line. We always keep them in device-table order.
*/
if (fscb_od && osduld_device_same(fscb_od, &odi)) {
sbi->comps.ods[i] = fscb_od;
++sbi->comps.numdevs;
eds[i].ored.od = fscb_od;
++sbi->oc.numdevs;
fscb_od = NULL;
continue;
}
@ -695,8 +667,8 @@ static int exofs_read_lookup_dev_table(struct exofs_sb_info *sbi,
goto out;
}
sbi->comps.ods[i] = od;
++sbi->comps.numdevs;
eds[i].ored.od = od;
++sbi->oc.numdevs;
/* Read the fscb of the other devices to make sure the FS
* partition is there.
@ -718,22 +690,11 @@ static int exofs_read_lookup_dev_table(struct exofs_sb_info *sbi,
out:
kfree(dt);
if (likely(!ret)) {
unsigned numdevs = sbi->comps.numdevs;
if (unlikely(fscb_od)) {
if (unlikely(fscb_od && !ret)) {
EXOFS_ERR("ERROR: Bad device-table container device not present\n");
osduld_put_device(fscb_od);
return -EINVAL;
}
/* exofs round-robins the device table view according to inode
* number. We hold a: twice bigger table hence inodes can point
* to any device and have a sequential view of the table
* starting at this device. See exofs_init_comps()
*/
for (i = 0; i < numdevs - 1; ++i)
sbi->comps.ods[i + numdevs] = sbi->comps.ods[i];
}
return ret;
}
@ -783,10 +744,9 @@ static int exofs_fill_super(struct super_block *sb, void *data, int silent)
sbi->one_comp.obj.partition = opts->pid;
sbi->one_comp.obj.id = 0;
exofs_make_credential(sbi->one_comp.cred, &sbi->one_comp.obj);
sbi->comps.numdevs = 1;
sbi->comps.single_comp = EC_SINGLE_COMP;
sbi->comps.comps = &sbi->one_comp;
sbi->comps.ods = sbi->_min_one_dev;
sbi->oc.numdevs = 1;
sbi->oc.single_comp = EC_SINGLE_COMP;
sbi->oc.comps = &sbi->one_comp;
/* fill in some other data by hand */
memset(sb->s_id, 0, sizeof(sb->s_id));
@ -835,7 +795,13 @@ static int exofs_fill_super(struct super_block *sb, void *data, int silent)
if (unlikely(ret))
goto free_sbi;
} else {
sbi->comps.ods[0] = od;
struct exofs_dev *eds;
ret = __alloc_dev_table(sbi, 1, &eds);
if (unlikely(ret))
goto free_sbi;
ore_comp_set_dev(&sbi->oc, 0, od);
}
__sbi_read_stats(sbi);
@ -875,7 +841,8 @@ static int exofs_fill_super(struct super_block *sb, void *data, int silent)
goto free_sbi;
}
_exofs_print_device("Mounting", opts->dev_name, sbi->comps.ods[0],
_exofs_print_device("Mounting", opts->dev_name,
ore_comp_dev(&sbi->oc, 0),
sbi->one_comp.obj.partition);
return 0;
@ -924,7 +891,7 @@ static int exofs_statfs(struct dentry *dentry, struct kstatfs *buf)
uint64_t used = ULLONG_MAX;
int ret;
ret = ore_get_io_state(&sbi->layout, &sbi->comps, &ios);
ret = ore_get_io_state(&sbi->layout, &sbi->oc, &ios);
if (ret) {
EXOFS_DBGMSG("ore_get_io_state failed.\n");
return ret;
@ -981,7 +948,7 @@ static const struct super_operations exofs_sops = {
* EXPORT OPERATIONS
*****************************************************************************/
struct dentry *exofs_get_parent(struct dentry *child)
static struct dentry *exofs_get_parent(struct dentry *child)
{
unsigned long ino = exofs_parent_ino(child);

80
include/scsi/osd_ore.h
View File

@ -34,15 +34,30 @@ 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;
unsigned group_width;
unsigned parity;
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 {
struct osd_dev *od;
};
struct ore_components {
unsigned first_dev; /* First logical device no */
unsigned numdevs; /* Num of devices in array */
/* If @single_comp == EC_SINGLE_COMP, @comps points to a single
* component. else there are @numdevs components
@ -51,20 +66,60 @@ struct ore_components {
EC_SINGLE_COMP = 0, EC_MULTPLE_COMPS = 0xffffffff
} single_comp;
struct ore_comp *comps;
struct osd_dev **ods; /* osd_dev array */
/* Array of pointers to ore_dev-* . User will usually have these pointed
* too a bigger struct which contain an "ore_dev ored" member and use
* container_of(oc->ods[i], struct foo_dev, ored) to access the bigger
* structure.
*/
struct ore_dev **ods;
};
/* ore_comp_dev Recievies a logical device index */
static inline struct osd_dev *ore_comp_dev(
const struct ore_components *oc, unsigned i)
{
BUG_ON((i < oc->first_dev) || (oc->first_dev + oc->numdevs <= i));
return oc->ods[i - oc->first_dev]->od;
}
static inline void ore_comp_set_dev(
struct ore_components *oc, unsigned i, struct osd_dev *od)
{
oc->ods[i - oc->first_dev]->od = od;
}
struct ore_striping_info {
u64 offset;
u64 obj_offset;
u64 length;
u64 first_stripe_start; /* only used in raid writes */
u64 M; /* for truncate */
unsigned bytes_in_stripe;
unsigned dev;
unsigned par_dev;
unsigned unit_off;
unsigned cur_pg;
unsigned cur_comp;
};
struct ore_io_state;
typedef void (*ore_io_done_fn)(struct ore_io_state *ios, void *private);
struct _ore_r4w_op {
/* @Priv given here is passed ios->private */
struct page * (*get_page)(void *priv, u64 page_index, bool *uptodate);
void (*put_page)(void *priv, struct page *page);
};
struct ore_io_state {
struct kref kref;
struct ore_striping_info si;
void *private;
ore_io_done_fn done;
struct ore_layout *layout;
struct ore_components *comps;
struct ore_components *oc;
/* Global read/write IO*/
loff_t offset;
@ -84,6 +139,16 @@ struct ore_io_state {
bool reading;
/* House keeping of Parity pages */
bool extra_part_alloc;
struct page **parity_pages;
unsigned max_par_pages;
unsigned cur_par_page;
unsigned sgs_per_dev;
struct __stripe_pages_2d *sp2d;
struct ore_io_state *ios_read_4_write;
const struct _ore_r4w_op *r4w;
/* Variable array of size numdevs */
unsigned numdevs;
struct ore_per_dev_state {
@ -91,7 +156,10 @@ struct ore_io_state {
struct bio *bio;
loff_t offset;
unsigned length;
unsigned last_sgs_total;
unsigned dev;
struct osd_sg_entry *sglist;
unsigned cur_sg;
} per_dev[];
};
@ -102,6 +170,9 @@ static inline unsigned ore_io_state_size(unsigned numdevs)
}
/* ore.c */
int ore_verify_layout(unsigned total_comps, struct ore_layout *layout);
void ore_calc_stripe_info(struct ore_layout *layout, u64 file_offset,
u64 length, struct ore_striping_info *si);
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);
@ -109,7 +180,10 @@ int ore_get_io_state(struct ore_layout *layout, struct ore_components *comps,
struct ore_io_state **ios);
void ore_put_io_state(struct ore_io_state *ios);
int ore_check_io(struct ore_io_state *ios, u64 *resid);
typedef void (*ore_on_dev_error)(struct ore_io_state *ios, struct ore_dev *od,
unsigned dev_index, enum osd_err_priority oep,
u64 dev_offset, u64 dev_len);
int ore_check_io(struct ore_io_state *ios, ore_on_dev_error rep);
int ore_create(struct ore_io_state *ios);
int ore_remove(struct ore_io_state *ios);