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-rw-r--r--fs/exofs/exofs.h11
-rw-r--r--fs/exofs/inode.c26
-rw-r--r--fs/exofs/ios.c327
-rw-r--r--fs/exofs/super.c52
4 files changed, 333 insertions, 83 deletions
diff --git a/fs/exofs/exofs.h b/fs/exofs/exofs.h
index 09e33193551..0d8a34b21ae 100644
--- a/fs/exofs/exofs.h
+++ b/fs/exofs/exofs.h
@@ -58,6 +58,14 @@
struct exofs_layout {
osd_id s_pid; /* partition ID of file system*/
+ /* Our way of looking at the data_map */
+ unsigned stripe_unit;
+ unsigned mirrors_p1;
+
+ unsigned group_width;
+
+ enum exofs_inode_layout_gen_functions lay_func;
+
unsigned s_numdevs; /* Num of devices in array */
struct osd_dev *s_ods[0]; /* Variable length */
};
@@ -133,6 +141,9 @@ struct exofs_io_state {
struct exofs_per_dev_state {
struct osd_request *or;
struct bio *bio;
+ loff_t offset;
+ unsigned length;
+ unsigned dev;
} per_dev[];
};
diff --git a/fs/exofs/inode.c b/fs/exofs/inode.c
index 0163546ba05..2b3163ea56e 100644
--- a/fs/exofs/inode.c
+++ b/fs/exofs/inode.c
@@ -869,18 +869,17 @@ static const struct osd_attr g_attr_inode_dir_layout = ATTR_DEF(
0);
/*
- * Read an inode from the OSD, and return it as is. We also return the size
- * attribute in the 'obj_size' argument.
+ * Read the Linux inode info from the OSD, and return it as is. In exofs the
+ * inode info is in an application specific page/attribute of the osd-object.
*/
static int exofs_get_inode(struct super_block *sb, struct exofs_i_info *oi,
- struct exofs_fcb *inode, uint64_t *obj_size)
+ struct exofs_fcb *inode)
{
struct exofs_sb_info *sbi = sb->s_fs_info;
struct osd_attr attrs[] = {
[0] = g_attr_inode_data,
[1] = g_attr_inode_file_layout,
[2] = g_attr_inode_dir_layout,
- [3] = g_attr_logical_length,
};
struct exofs_io_state *ios;
struct exofs_on_disk_inode_layout *layout;
@@ -944,15 +943,6 @@ static int exofs_get_inode(struct super_block *sb, struct exofs_i_info *oi,
}
}
- *obj_size = ~0;
- ret = extract_attr_from_ios(ios, &attrs[3]);
- if (ret) {
- EXOFS_ERR("%s: extract_attr of logical_length failed\n",
- __func__);
- goto out;
- }
- *obj_size = get_unaligned_be64(attrs[3].val_ptr);
-
out:
exofs_put_io_state(ios);
return ret;
@@ -971,7 +961,6 @@ struct inode *exofs_iget(struct super_block *sb, unsigned long ino)
struct exofs_i_info *oi;
struct exofs_fcb fcb;
struct inode *inode;
- uint64_t obj_size;
int ret;
inode = iget_locked(sb, ino);
@@ -983,7 +972,7 @@ struct inode *exofs_iget(struct super_block *sb, unsigned long ino)
__oi_init(oi);
/* read the inode from the osd */
- ret = exofs_get_inode(sb, oi, &fcb, &obj_size);
+ ret = exofs_get_inode(sb, oi, &fcb);
if (ret)
goto bad_inode;
@@ -1004,13 +993,6 @@ struct inode *exofs_iget(struct super_block *sb, unsigned long ino)
inode->i_blkbits = EXOFS_BLKSHIFT;
inode->i_generation = le32_to_cpu(fcb.i_generation);
- if ((inode->i_size != obj_size) &&
- (!exofs_inode_is_fast_symlink(inode))) {
- EXOFS_ERR("WARNING: Size of inode=%llu != object=%llu\n",
- inode->i_size, _LLU(obj_size));
- /* FIXME: call exofs_inode_recovery() */
- }
-
oi->i_dir_start_lookup = 0;
if ((inode->i_nlink == 0) && (inode->i_mode == 0)) {
diff --git a/fs/exofs/ios.c b/fs/exofs/ios.c
index 2b81f99fd62..6e446b2670b 100644
--- a/fs/exofs/ios.c
+++ b/fs/exofs/ios.c
@@ -23,6 +23,7 @@
*/
#include <scsi/scsi_device.h>
+#include <asm/div64.h>
#include "exofs.h"
@@ -110,7 +111,17 @@ void exofs_put_io_state(struct exofs_io_state *ios)
unsigned exofs_layout_od_id(struct exofs_layout *layout,
osd_id obj_no, unsigned layout_index)
{
- return layout_index;
+/* switch (layout->lay_func) {
+ case LAYOUT_MOVING_WINDOW:
+ {*/
+ unsigned dev_mod = obj_no;
+
+ return (layout_index + dev_mod * layout->mirrors_p1) %
+ layout->s_numdevs;
+/* }
+ case LAYOUT_FUNC_IMPLICT:
+ return layout->devs[layout_index];
+ }*/
}
static inline struct osd_dev *exofs_ios_od(struct exofs_io_state *ios,
@@ -225,8 +236,8 @@ int exofs_check_io(struct exofs_io_state *ios, u64 *resid)
_clear_bio(ios->per_dev[i].bio);
EXOFS_DBGMSG("start read offset passed end of file "
"offset=0x%llx, length=0x%llx\n",
- _LLU(ios->offset),
- _LLU(ios->length));
+ _LLU(ios->per_dev[i].offset),
+ _LLU(ios->per_dev[i].length));
continue; /* we recovered */
}
@@ -248,6 +259,127 @@ int exofs_check_io(struct exofs_io_state *ios, u64 *resid)
return acumulated_lin_err;
}
+/* REMOVEME: After review
+ Some quoteing from the standard
+
+ L = logical offset into the file
+ W = number of data components in a stripe
+ S = W * stripe_unit (S is Stripe length)
+ N = L / S (N is the stripe Number)
+ C = (L-(N*S)) / stripe_unit (C is the component)
+ O = (N*stripe_unit)+(L%stripe_unit) (O is the object's offset)
+*/
+
+static void _offset_dev_unit_off(struct exofs_io_state *ios, u64 file_offset,
+ u64 *obj_offset, unsigned *dev, unsigned *unit_off)
+{
+ unsigned stripe_unit = ios->layout->stripe_unit;
+ unsigned stripe_length = stripe_unit * ios->layout->group_width;
+ u64 stripe_no = file_offset;
+ unsigned stripe_mod = do_div(stripe_no, stripe_length);
+
+ *unit_off = stripe_mod % stripe_unit;
+ *obj_offset = stripe_no * stripe_unit + *unit_off;
+ *dev = stripe_mod / stripe_unit * ios->layout->mirrors_p1;
+}
+
+static int _add_stripe_unit(struct exofs_io_state *ios, unsigned *cur_bvec,
+ struct exofs_per_dev_state *per_dev, int cur_len)
+{
+ unsigned bv = *cur_bvec;
+ struct request_queue *q =
+ osd_request_queue(exofs_ios_od(ios, per_dev->dev));
+
+ per_dev->length += cur_len;
+
+ if (per_dev->bio == NULL) {
+ unsigned pages_in_stripe = ios->layout->group_width *
+ (ios->layout->stripe_unit / PAGE_SIZE);
+ unsigned bio_size = (ios->bio->bi_vcnt + pages_in_stripe) /
+ ios->layout->group_width;
+
+ per_dev->bio = bio_kmalloc(GFP_KERNEL, bio_size);
+ if (unlikely(!per_dev->bio)) {
+ EXOFS_DBGMSG("Faild to allocate BIO size=%u\n",
+ bio_size);
+ return -ENOMEM;
+ }
+ }
+
+ while (cur_len > 0) {
+ int added_len;
+ struct bio_vec *bvec = &ios->bio->bi_io_vec[bv];
+
+ BUG_ON(ios->bio->bi_vcnt <= bv);
+ cur_len -= bvec->bv_len;
+
+ added_len = bio_add_pc_page(q, per_dev->bio, bvec->bv_page,
+ bvec->bv_len, bvec->bv_offset);
+ if (unlikely(bvec->bv_len != added_len))
+ return -ENOMEM;
+ ++bv;
+ }
+ BUG_ON(cur_len);
+
+ *cur_bvec = bv;
+ return 0;
+}
+
+static int _prepare_for_striping(struct exofs_io_state *ios)
+{
+ u64 length = ios->length;
+ u64 offset = ios->offset;
+ unsigned stripe_unit = ios->layout->stripe_unit;
+ unsigned comp = 0;
+ unsigned stripes = 0;
+ unsigned cur_bvec = 0;
+ int ret;
+
+ if (!ios->bio) {
+ if (ios->kern_buff) {
+ struct exofs_per_dev_state *per_dev = &ios->per_dev[0];
+ unsigned unit_off;
+
+ _offset_dev_unit_off(ios, offset, &per_dev->offset,
+ &per_dev->dev, &unit_off);
+ /* no cross device without page array */
+ BUG_ON((ios->layout->group_width > 1) &&
+ (unit_off + length > stripe_unit));
+ }
+ ios->numdevs = ios->layout->mirrors_p1;
+ return 0;
+ }
+
+ while (length) {
+ struct exofs_per_dev_state *per_dev = &ios->per_dev[comp];
+ unsigned cur_len;
+
+ if (!per_dev->length) {
+ unsigned unit_off;
+
+ _offset_dev_unit_off(ios, offset, &per_dev->offset,
+ &per_dev->dev, &unit_off);
+ stripes++;
+ cur_len = min_t(u64, stripe_unit - unit_off, length);
+ offset += cur_len;
+ } else {
+ cur_len = min_t(u64, stripe_unit, length);
+ }
+
+ ret = _add_stripe_unit(ios, &cur_bvec, per_dev, cur_len);
+ if (unlikely(ret))
+ goto out;
+
+ comp += ios->layout->mirrors_p1;
+ comp %= ios->layout->s_numdevs;
+
+ length -= cur_len;
+ }
+out:
+ ios->numdevs = stripes * ios->layout->mirrors_p1;
+ return ret;
+}
+
int exofs_sbi_create(struct exofs_io_state *ios)
{
int i, ret;
@@ -296,61 +428,71 @@ out:
return ret;
}
-int exofs_sbi_write(struct exofs_io_state *ios)
+static int _sbi_write_mirror(struct exofs_io_state *ios, int cur_comp)
{
- int i, ret;
+ struct exofs_per_dev_state *master_dev = &ios->per_dev[cur_comp];
+ unsigned dev = ios->per_dev[cur_comp].dev;
+ unsigned last_comp = cur_comp + ios->layout->mirrors_p1;
+ int ret = 0;
- for (i = 0; i < ios->layout->s_numdevs; i++) {
+ for (; cur_comp < last_comp; ++cur_comp, ++dev) {
+ struct exofs_per_dev_state *per_dev = &ios->per_dev[cur_comp];
struct osd_request *or;
- or = osd_start_request(exofs_ios_od(ios, i), GFP_KERNEL);
+ or = osd_start_request(exofs_ios_od(ios, dev), GFP_KERNEL);
if (unlikely(!or)) {
EXOFS_ERR("%s: osd_start_request failed\n", __func__);
ret = -ENOMEM;
goto out;
}
- ios->per_dev[i].or = or;
- ios->numdevs++;
+ per_dev->or = or;
+ per_dev->offset = master_dev->offset;
if (ios->bio) {
struct bio *bio;
- if (i != 0) {
+ if (per_dev != master_dev) {
bio = bio_kmalloc(GFP_KERNEL,
- ios->bio->bi_max_vecs);
+ master_dev->bio->bi_max_vecs);
if (unlikely(!bio)) {
EXOFS_DBGMSG(
"Faild to allocate BIO size=%u\n",
- ios->bio->bi_max_vecs);
+ master_dev->bio->bi_max_vecs);
ret = -ENOMEM;
goto out;
}
- __bio_clone(bio, ios->bio);
+ __bio_clone(bio, master_dev->bio);
bio->bi_bdev = NULL;
bio->bi_next = NULL;
- ios->per_dev[i].bio = bio;
+ per_dev->length = master_dev->length;
+ per_dev->bio = bio;
+ per_dev->dev = dev;
} else {
- bio = ios->bio;
+ bio = master_dev->bio;
+ /* FIXME: bio_set_dir() */
+ bio->bi_rw |= (1 << BIO_RW);
}
- osd_req_write(or, &ios->obj, ios->offset, bio,
- ios->length);
+ osd_req_write(or, &ios->obj, per_dev->offset, bio,
+ per_dev->length);
EXOFS_DBGMSG("write(0x%llx) offset=0x%llx "
"length=0x%llx dev=%d\n",
- _LLU(ios->obj.id), _LLU(ios->offset),
- _LLU(ios->length), i);
+ _LLU(ios->obj.id), _LLU(per_dev->offset),
+ _LLU(per_dev->length), dev);
} else if (ios->kern_buff) {
- osd_req_write_kern(or, &ios->obj, ios->offset,
+ ret = osd_req_write_kern(or, &ios->obj, per_dev->offset,
ios->kern_buff, ios->length);
+ if (unlikely(ret))
+ goto out;
EXOFS_DBGMSG2("write_kern(0x%llx) offset=0x%llx "
"length=0x%llx dev=%d\n",
- _LLU(ios->obj.id), _LLU(ios->offset),
- _LLU(ios->length), i);
+ _LLU(ios->obj.id), _LLU(per_dev->offset),
+ _LLU(ios->length), dev);
} else {
osd_req_set_attributes(or, &ios->obj);
EXOFS_DBGMSG2("obj(0x%llx) set_attributes=%d dev=%d\n",
- _LLU(ios->obj.id), ios->out_attr_len, i);
+ _LLU(ios->obj.id), ios->out_attr_len, dev);
}
if (ios->out_attr)
@@ -361,40 +503,57 @@ int exofs_sbi_write(struct exofs_io_state *ios)
osd_req_add_get_attr_list(or, ios->in_attr,
ios->in_attr_len);
}
- ret = exofs_io_execute(ios);
out:
return ret;
}
-int exofs_sbi_read(struct exofs_io_state *ios)
+int exofs_sbi_write(struct exofs_io_state *ios)
+{
+ int i;
+ int ret;
+
+ ret = _prepare_for_striping(ios);
+ if (unlikely(ret))
+ return ret;
+
+ for (i = 0; i < ios->numdevs; i += ios->layout->mirrors_p1) {
+ ret = _sbi_write_mirror(ios, i);
+ if (unlikely(ret))
+ return ret;
+ }
+
+ ret = exofs_io_execute(ios);
+ return ret;
+}
+
+static int _sbi_read_mirror(struct exofs_io_state *ios, unsigned cur_comp)
{
struct osd_request *or;
- struct exofs_per_dev_state *per_dev = &ios->per_dev[0];
+ struct exofs_per_dev_state *per_dev = &ios->per_dev[cur_comp];
unsigned first_dev = (unsigned)ios->obj.id;
- first_dev %= ios->layout->s_numdevs;
+ first_dev = per_dev->dev + first_dev % ios->layout->mirrors_p1;
or = osd_start_request(exofs_ios_od(ios, first_dev), GFP_KERNEL);
if (unlikely(!or)) {
EXOFS_ERR("%s: osd_start_request failed\n", __func__);
return -ENOMEM;
}
per_dev->or = or;
- ios->numdevs++;
if (ios->bio) {
- osd_req_read(or, &ios->obj, ios->offset, ios->bio, ios->length);
+ osd_req_read(or, &ios->obj, per_dev->offset,
+ per_dev->bio, per_dev->length);
EXOFS_DBGMSG("read(0x%llx) offset=0x%llx length=0x%llx"
" dev=%d\n", _LLU(ios->obj.id),
- _LLU(ios->offset), _LLU(ios->length),
+ _LLU(per_dev->offset), _LLU(per_dev->length),
first_dev);
} else if (ios->kern_buff) {
- int ret = osd_req_read_kern(or, &ios->obj, ios->offset,
+ int ret = osd_req_read_kern(or, &ios->obj, per_dev->offset,
ios->kern_buff, ios->length);
-
EXOFS_DBGMSG2("read_kern(0x%llx) offset=0x%llx "
"length=0x%llx dev=%d ret=>%d\n",
- _LLU(ios->obj.id), _LLU(ios->offset),
+ _LLU(ios->obj.id), _LLU(per_dev->offset),
_LLU(ios->length), first_dev, ret);
if (unlikely(ret))
return ret;
@@ -403,14 +562,32 @@ int exofs_sbi_read(struct exofs_io_state *ios)
EXOFS_DBGMSG2("obj(0x%llx) get_attributes=%d dev=%d\n",
_LLU(ios->obj.id), ios->in_attr_len, first_dev);
}
-
if (ios->out_attr)
osd_req_add_set_attr_list(or, ios->out_attr, ios->out_attr_len);
if (ios->in_attr)
osd_req_add_get_attr_list(or, ios->in_attr, ios->in_attr_len);
- return exofs_io_execute(ios);
+ return 0;
+}
+
+int exofs_sbi_read(struct exofs_io_state *ios)
+{
+ int i;
+ int ret;
+
+ ret = _prepare_for_striping(ios);
+ if (unlikely(ret))
+ return ret;
+
+ for (i = 0; i < ios->numdevs; i += ios->layout->mirrors_p1) {
+ ret = _sbi_read_mirror(ios, i);
+ if (unlikely(ret))
+ return ret;
+ }
+
+ ret = exofs_io_execute(ios);
+ return ret;
}
int extract_attr_from_ios(struct exofs_io_state *ios, struct osd_attr *attr)
@@ -434,42 +611,84 @@ int extract_attr_from_ios(struct exofs_io_state *ios, struct osd_attr *attr)
return -EIO;
}
+static int _truncate_mirrors(struct exofs_io_state *ios, unsigned cur_comp,
+ struct osd_attr *attr)
+{
+ int last_comp = cur_comp + ios->layout->mirrors_p1;
+
+ for (; cur_comp < last_comp; ++cur_comp) {
+ struct exofs_per_dev_state *per_dev = &ios->per_dev[cur_comp];
+ struct osd_request *or;
+
+ or = osd_start_request(exofs_ios_od(ios, cur_comp), GFP_KERNEL);
+ if (unlikely(!or)) {
+ EXOFS_ERR("%s: osd_start_request failed\n", __func__);
+ return -ENOMEM;
+ }
+ per_dev->or = or;
+
+ osd_req_set_attributes(or, &ios->obj);
+ osd_req_add_set_attr_list(or, attr, 1);
+ }
+
+ return 0;
+}
+
int exofs_oi_truncate(struct exofs_i_info *oi, u64 size)
{
struct exofs_sb_info *sbi = oi->vfs_inode.i_sb->s_fs_info;
struct exofs_io_state *ios;
- struct osd_attr attr;
- __be64 newsize;
+ struct exofs_trunc_attr {
+ struct osd_attr attr;
+ __be64 newsize;
+ } *size_attrs;
+ u64 this_obj_size;
+ unsigned dev;
+ unsigned unit_off;
int i, ret;
- if (exofs_get_io_state(&sbi->layout, &ios))
- return -ENOMEM;
+ ret = exofs_get_io_state(&sbi->layout, &ios);
+ if (unlikely(ret))
+ return ret;
+
+ size_attrs = kcalloc(ios->layout->group_width, sizeof(*size_attrs),
+ GFP_KERNEL);
+ if (unlikely(!size_attrs)) {
+ ret = -ENOMEM;
+ goto out;
+ }
ios->obj.id = exofs_oi_objno(oi);
ios->cred = oi->i_cred;
- newsize = cpu_to_be64(size);
- attr = g_attr_logical_length;
- attr.val_ptr = &newsize;
+ ios->numdevs = ios->layout->s_numdevs;
+ _offset_dev_unit_off(ios, size, &this_obj_size, &dev, &unit_off);
- for (i = 0; i < sbi->layout.s_numdevs; i++) {
- struct osd_request *or;
+ for (i = 0; i < ios->layout->group_width; ++i) {
+ struct exofs_trunc_attr *size_attr = &size_attrs[i];
+ u64 obj_size;
- or = osd_start_request(exofs_ios_od(ios, i), GFP_KERNEL);
- if (unlikely(!or)) {
- EXOFS_ERR("%s: osd_start_request failed\n", __func__);
- ret = -ENOMEM;
- goto out;
- }
- ios->per_dev[i].or = or;
- ios->numdevs++;
+ if (i < dev)
+ obj_size = this_obj_size +
+ ios->layout->stripe_unit - unit_off;
+ else if (i == dev)
+ obj_size = this_obj_size;
+ else /* i > dev */
+ obj_size = this_obj_size - unit_off;
- osd_req_set_attributes(or, &ios->obj);
- osd_req_add_set_attr_list(or, &attr, 1);
+ size_attr->newsize = cpu_to_be64(obj_size);
+ size_attr->attr = g_attr_logical_length;
+ size_attr->attr.val_ptr = &size_attr->newsize;
+
+ ret = _truncate_mirrors(ios, i * ios->layout->mirrors_p1,
+ &size_attr->attr);
+ if (unlikely(ret))
+ goto out;
}
ret = exofs_io_execute(ios);
out:
+ kfree(size_attrs);
exofs_put_io_state(ios);
return ret;
}
diff --git a/fs/exofs/super.c b/fs/exofs/super.c
index fc8875186ae..8f4e4b37a57 100644
--- a/fs/exofs/super.c
+++ b/fs/exofs/super.c
@@ -308,6 +308,8 @@ 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;
+
sbi->data_map.odm_num_comps =
le32_to_cpu(dt->dt_data_map.cb_num_comps);
sbi->data_map.odm_stripe_unit =
@@ -321,14 +323,47 @@ static int _read_and_match_data_map(struct exofs_sb_info *sbi, unsigned numdevs,
sbi->data_map.odm_raid_algorithm =
le32_to_cpu(dt->dt_data_map.cb_raid_algorithm);
-/* FIXME: Hard coded mirror only for now. if not so do not mount */
- if ((sbi->data_map.odm_num_comps != numdevs) ||
- (sbi->data_map.odm_stripe_unit != EXOFS_BLKSIZE) ||
- (sbi->data_map.odm_raid_algorithm != PNFS_OSD_RAID_0) ||
- (sbi->data_map.odm_mirror_cnt != (numdevs - 1)))
+/* FIXME: Only raid0 !group_width/depth for now. if not so, do not mount */
+ if (sbi->data_map.odm_group_width || sbi->data_map.odm_group_depth) {
+ EXOFS_ERR("Group width/depth not supported\n");
return -EINVAL;
- else
- return 0;
+ }
+ 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;
+ }
+
+ stripe_length = sbi->data_map.odm_stripe_unit *
+ (numdevs / (sbi->data_map.odm_mirror_cnt + 1));
+ if (stripe_length >= (1ULL << 32)) {
+ EXOFS_ERR("Total Stripe length(0x%llx)"
+ " >= 32bit is not supported\n", _LLU(stripe_length));
+ 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;
+ sbi->layout.group_width = sbi->data_map.odm_num_comps /
+ sbi->layout.mirrors_p1;
+
+ return 0;
}
/* @odi is valid only as long as @fscb_dev is valid */
@@ -502,6 +537,9 @@ static int exofs_fill_super(struct super_block *sb, void *data, int silent)
}
/* Default layout in case we do not have a device-table */
+ sbi->layout.stripe_unit = PAGE_SIZE;
+ sbi->layout.mirrors_p1 = 1;
+ sbi->layout.group_width = 1;
sbi->layout.s_ods[0] = od;
sbi->layout.s_numdevs = 1;
sbi->layout.s_pid = opts->pid;