1 files changed, 488 insertions, 87 deletions

diff --git a/fs/exofs/ios.c b/fs/exofs/ios.c
index 5bad01fa1f9f..5293bc411d17 100644
--- a/fs/exofs/ios.c
+++ b/fs/exofs/ios.c
@@ -23,9 +23,13 @@
  */
 
 #include <scsi/scsi_device.h>
+#include <asm/div64.h>
 
 #include "exofs.h"
 
+#define EXOFS_DBGMSG2(M...) do {} while (0)
+/* #define EXOFS_DBGMSG2 EXOFS_DBGMSG */
+
 void exofs_make_credential(u8 cred_a[OSD_CAP_LEN], const struct osd_obj_id *obj)
 {
         osd_sec_init_nosec_doall_caps(cred_a, obj, false, true);
@@ -64,21 +68,24 @@ out:
         return ret;
 }
 
-int exofs_get_io_state(struct exofs_sb_info *sbi, struct exofs_io_state** pios)
+int exofs_get_io_state(struct exofs_layout *layout,
+                       struct exofs_io_state **pios)
 {
         struct exofs_io_state *ios;
 
         /*TODO: Maybe use kmem_cach per sbi of size
-         * exofs_io_state_size(sbi->s_numdevs)
+         * exofs_io_state_size(layout->s_numdevs)
          */
-        ios = kzalloc(exofs_io_state_size(sbi->s_numdevs), GFP_KERNEL);
+        ios = kzalloc(exofs_io_state_size(layout->s_numdevs), GFP_KERNEL);
         if (unlikely(!ios)) {
+                EXOFS_DBGMSG("Faild kzalloc bytes=%d\n",
+                             exofs_io_state_size(layout->s_numdevs));
                 *pios = NULL;
                 return -ENOMEM;
         }
 
-        ios->sbi = sbi;
-        ios->obj.partition = sbi->s_pid;
+        ios->layout = layout;
+        ios->obj.partition = layout->s_pid;
         *pios = ios;
         return 0;
 }
@@ -101,6 +108,29 @@ 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)
+{
+/*      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,
+                                           unsigned layout_index)
+{
+        return ios->layout->s_ods[
+                exofs_layout_od_id(ios->layout, ios->obj.id, layout_index)];
+}
+
 static void _sync_done(struct exofs_io_state *ios, void *p)
 {
         struct completion *waiting = p;
@@ -168,6 +198,21 @@ static int exofs_io_execute(struct exofs_io_state *ios)
         return ret;
 }
 
+static void _clear_bio(struct bio *bio)
+{
+        struct bio_vec *bv;
+        unsigned i;
+
+        __bio_for_each_segment(bv, bio, i, 0) {
+                unsigned this_count = bv->bv_len;
+
+                if (likely(PAGE_SIZE == this_count))
+                        clear_highpage(bv->bv_page);
+                else
+                        zero_user(bv->bv_page, bv->bv_offset, this_count);
+        }
+}
+
 int exofs_check_io(struct exofs_io_state *ios, u64 *resid)
 {
         enum osd_err_priority acumulated_osd_err = 0;
@@ -176,16 +221,25 @@ int exofs_check_io(struct exofs_io_state *ios, u64 *resid)
 
         for (i = 0; i < ios->numdevs; i++) {
                 struct osd_sense_info osi;
-                int ret = osd_req_decode_sense(ios->per_dev[i].or, &osi);
+                struct osd_request *or = ios->per_dev[i].or;
+                int ret;
+
+                if (unlikely(!or))
+                        continue;
 
+                ret = osd_req_decode_sense(or, &osi);
                 if (likely(!ret))
                         continue;
 
-                if (unlikely(ret == -EFAULT)) {
-                        EXOFS_DBGMSG("%s: EFAULT Need page clear\n", __func__);
-                        /*FIXME: All the pages in this device range should:
-                         *      clear_highpage(page);
-                         */
+                if (OSD_ERR_PRI_CLEAR_PAGES == osi.osd_err_pri) {
+                        /* start read offset passed endof file */
+                        _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->per_dev[i].offset),
+                                _LLU(ios->per_dev[i].length));
+
+                        continue; /* we recovered */
                 }
 
                 if (osi.osd_err_pri >= acumulated_osd_err) {
@@ -205,14 +259,259 @@ int exofs_check_io(struct exofs_io_state *ios, u64 *resid)
         return acumulated_lin_err;
 }
 
+/*
+ * L - logical offset into the file
+ *
+ * U - The number of bytes in a stripe within a group
+ *
+ *      U = stripe_unit * group_width
+ *
+ * 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
+ *
+ * S - The number of bytes striped across all component objects
+ *     before the pattern repeats
+ *
+ *      S = stripe_unit * group_width * group_depth * group_count
+ *
+ * M - The "major" (i.e., across all components) stripe number
+ *
+ *      M = L / S
+ *
+ * G - Counts the groups from the beginning of the major stripe
+ *
+ *      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]
+ *
+ * O - The component offset coresponding to L
+ *
+ *      O = L % stripe_unit + N * stripe_unit + M * group_depth * stripe_unit
+ */
+struct _striping_info {
+        u64 obj_offset;
+        u64 group_length;
+        u64 total_group_length;
+        u64 Major;
+        unsigned dev;
+        unsigned unit_off;
+};
+
+static void _calc_stripe_info(struct exofs_io_state *ios, u64 file_offset,
+                              struct _striping_info *si)
+{
+        u32     stripe_unit = ios->layout->stripe_unit;
+        u32     group_width = ios->layout->group_width;
+        u64     group_depth = ios->layout->group_depth;
+
+        u32     U = stripe_unit * group_width;
+        u64     T = U * group_depth;
+        u64     S = T * ios->layout->group_count;
+        u64     M = div64_u64(file_offset, S);
+
+        /*
+        G = (L - (M * S)) / T
+        H = (L - (M * S)) % T
+        */
+        u64     LmodS = file_offset - M * S;
+        u32     G = div64_u64(LmodS, T);
+        u64     H = LmodS - G * T;
+
+        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 *= ios->layout->mirrors_p1;
+
+        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->total_group_length = T;
+        si->Major = M;
+}
+
+static int _add_stripe_unit(struct exofs_io_state *ios,  unsigned *cur_pg,
+                unsigned pgbase, struct exofs_per_dev_state *per_dev,
+                int cur_len)
+{
+        unsigned pg = *cur_pg;
+        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->nr_pages + 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) {
+                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],
+                                            pglen, pgbase);
+                if (unlikely(pglen != added_len))
+                        return -ENOMEM;
+                pgbase = 0;
+                ++pg;
+        }
+        BUG_ON(cur_len);
+
+        *cur_pg = pg;
+        return 0;
+}
+
+static int _prepare_one_group(struct exofs_io_state *ios, u64 length,
+                              struct _striping_info *si, unsigned first_comp)
+{
+        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 comp = first_comp + (dev - first_dev);
+        unsigned max_comp = ios->numdevs ? ios->numdevs - mirrors_p1 : 0;
+        unsigned cur_pg = ios->pages_consumed;
+        int ret = 0;
+
+        while (length) {
+                struct exofs_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) {
+                                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;
+                                cur_len = stripe_unit;
+                        }
+
+                        if (max_comp < comp)
+                                max_comp = comp;
+
+                        dev += mirrors_p1;
+                        dev = (dev % devs_in_group) + first_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);
+                if (unlikely(ret))
+                        goto out;
+
+                comp += mirrors_p1;
+                comp = (comp % devs_in_group) + first_comp;
+
+                length -= cur_len;
+        }
+out:
+        ios->numdevs = max_comp + mirrors_p1;
+        ios->pages_consumed = cur_pg;
+        return ret;
+}
+
+static int _prepare_for_striping(struct exofs_io_state *ios)
+{
+        u64 length = ios->length;
+        struct _striping_info si;
+        unsigned devs_in_group = ios->layout->group_width *
+                                 ios->layout->mirrors_p1;
+        unsigned first_comp = 0;
+        int ret = 0;
+
+        _calc_stripe_info(ios, ios->offset, &si);
+
+        if (!ios->pages) {
+                if (ios->kern_buff) {
+                        struct exofs_per_dev_state *per_dev = &ios->per_dev[0];
+
+                        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) {
+                if (length < si.group_length)
+                        si.group_length = length;
+
+                ret = _prepare_one_group(ios, si.group_length, &si, first_comp);
+                if (unlikely(ret))
+                        goto out;
+
+                length -= si.group_length;
+
+                si.group_length = si.total_group_length;
+                si.unit_off = 0;
+                ++si.Major;
+                si.obj_offset = si.Major * ios->layout->stripe_unit *
+                                                ios->layout->group_depth;
+
+                si.dev = (si.dev - (si.dev % devs_in_group)) + devs_in_group;
+                si.dev %= ios->layout->s_numdevs;
+
+                first_comp += devs_in_group;
+                first_comp %= ios->layout->s_numdevs;
+        }
+
+out:
+        return ret;
+}
+
 int exofs_sbi_create(struct exofs_io_state *ios)
 {
         int i, ret;
 
-        for (i = 0; i < ios->sbi->s_numdevs; i++) {
+        for (i = 0; i < ios->layout->s_numdevs; i++) {
                 struct osd_request *or;
 
-                or = osd_start_request(ios->sbi->s_ods[i], GFP_KERNEL);
+                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;
@@ -233,10 +532,10 @@ int exofs_sbi_remove(struct exofs_io_state *ios)
 {
         int i, ret;
 
-        for (i = 0; i < ios->sbi->s_numdevs; i++) {
+        for (i = 0; i < ios->layout->s_numdevs; i++) {
                 struct osd_request *or;
 
-                or = osd_start_request(ios->sbi->s_ods[i], GFP_KERNEL);
+                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;
@@ -253,51 +552,74 @@ 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->sbi->s_numdevs; i++) {
+        if (ios->pages && !master_dev->length)
+                return 0; /* Just an empty slot */
+
+        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(ios->sbi->s_ods[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) {
+                if (ios->pages) {
                         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",
+                                              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);
-/*                      EXOFS_DBGMSG("write sync=%d\n", sync);*/
+                        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(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);
-/*                      EXOFS_DBGMSG("write_kern sync=%d\n", sync);*/
+                        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(per_dev->offset),
+                                     _LLU(ios->length), dev);
                 } else {
                         osd_req_set_attributes(or, &ios->obj);
-/*                      EXOFS_DBGMSG("set_attributes sync=%d\n", sync);*/
+                        EXOFS_DBGMSG2("obj(0x%llx) set_attributes=%d dev=%d\n",
+                                     _LLU(ios->obj.id), ios->out_attr_len, dev);
                 }
 
                 if (ios->out_attr)
@@ -308,54 +630,93 @@ 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, ret;
+        int i;
+        int ret;
 
-        for (i = 0; i < 1; i++) {
-                struct osd_request *or;
-                unsigned first_dev = (unsigned)ios->obj.id;
+        ret = _prepare_for_striping(ios);
+        if (unlikely(ret))
+                return ret;
 
-                first_dev %= ios->sbi->s_numdevs;
-                or = osd_start_request(ios->sbi->s_ods[first_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++;
+        for (i = 0; i < ios->numdevs; i += ios->layout->mirrors_p1) {
+                ret = _sbi_write_mirror(ios, i);
+                if (unlikely(ret))
+                        return ret;
+        }
 
-                if (ios->bio) {
-                        osd_req_read(or, &ios->obj, ios->offset, ios->bio,
-                                     ios->length);
-/*                      EXOFS_DBGMSG("read sync=%d\n", sync);*/
-                } else if (ios->kern_buff) {
-                        osd_req_read_kern(or, &ios->obj, ios->offset,
-                                           ios->kern_buff, ios->length);
-/*                      EXOFS_DBGMSG("read_kern sync=%d\n", sync);*/
-                } else {
-                        osd_req_get_attributes(or, &ios->obj);
-/*                      EXOFS_DBGMSG("get_attributes sync=%d\n", sync);*/
-                }
+        ret = exofs_io_execute(ios);
+        return ret;
+}
 
-                if (ios->out_attr)
-                        osd_req_add_set_attr_list(or, ios->out_attr,
-                                                  ios->out_attr_len);
+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[cur_comp];
+        unsigned first_dev = (unsigned)ios->obj.id;
 
-                if (ios->in_attr)
-                        osd_req_add_get_attr_list(or, ios->in_attr,
-                                                  ios->in_attr_len);
+        if (ios->pages && !per_dev->length)
+                return 0; /* Just an empty slot */
+
+        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;
         }
-        ret = exofs_io_execute(ios);
+        per_dev->or = or;
+
+        if (ios->pages) {
+                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(per_dev->offset), _LLU(per_dev->length),
+                             first_dev);
+        } else if (ios->kern_buff) {
+                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(per_dev->offset),
+                              _LLU(ios->length), first_dev, ret);
+                if (unlikely(ret))
+                        return ret;
+        } else {
+                osd_req_get_attributes(or, &ios->obj);
+                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);
 
-out:
+        if (ios->in_attr)
+                osd_req_add_get_attr_list(or, ios->in_attr, ios->in_attr_len);
+
+        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;
 }
 
@@ -380,42 +741,82 @@ 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;
+        struct _striping_info si;
         int i, ret;
 
-        if (exofs_get_io_state(sbi, &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;
+        _calc_stripe_info(ios, size, &si);
 
-        for (i = 0; i < sbi->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(sbi->s_ods[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 < si.dev)
+                        obj_size = si.obj_offset +
+                                        ios->layout->stripe_unit - si.unit_off;
+                else if (i == si.dev)
+                        obj_size = si.obj_offset;
+                else /* i > si.dev */
+                        obj_size = si.obj_offset - si.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;
 }