/*
 * Copyright (C) 2005, 2006
 * Avishay Traeger (avishay@gmail.com)
 * Copyright (C) 2008, 2009
 * Boaz Harrosh <bharrosh@panasas.com>
 *
 * This file is part of exofs.
 *
 * exofs is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation.  Since it is based on ext2, and the only
 * valid version of GPL for the Linux kernel is version 2, the only valid
 * version of GPL for exofs is version 2.
 *
 * exofs is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with exofs; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include <linux/slab.h>
#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);
}

int exofs_read_kern(struct osd_dev *od, u8 *cred, struct osd_obj_id *obj,
                    u64 offset, void *p, unsigned length)
{
        struct osd_request *or = osd_start_request(od, GFP_KERNEL);
/*      struct osd_sense_info osi = {.key = 0};*/
        int ret;

        if (unlikely(!or)) {
                EXOFS_DBGMSG("%s: osd_start_request failed.\n", __func__);
                return -ENOMEM;
        }
        ret = osd_req_read_kern(or, obj, offset, p, length);
        if (unlikely(ret)) {
                EXOFS_DBGMSG("%s: osd_req_read_kern failed.\n", __func__);
                goto out;
        }

        ret = osd_finalize_request(or, 0, cred, NULL);
        if (unlikely(ret)) {
                EXOFS_DBGMSG("Failed to osd_finalize_request() => %d\n", ret);
                goto out;
        }

        ret = osd_execute_request(or);
        if (unlikely(ret))
                EXOFS_DBGMSG("osd_execute_request() => %d\n", ret);
        /* osd_req_decode_sense(or, ret); */

out:
        osd_end_request(or);
        return ret;
}

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(layout->s_numdevs)
         */
        ios = kzalloc(exofs_io_state_size(layout->s_numdevs), GFP_KERNEL);
        if (unlikely(!ios)) {
                EXOFS_DBGMSG("Failed kzalloc bytes=%d\n",
                             exofs_io_state_size(layout->s_numdevs));
                *pios = NULL;
                return -ENOMEM;
        }

        ios->layout = layout;
        ios->obj.partition = layout->s_pid;
        *pios = ios;
        return 0;
}

void exofs_put_io_state(struct exofs_io_state *ios)
{
        if (ios) {
                unsigned i;

                for (i = 0; i < ios->numdevs; i++) {
                        struct exofs_per_dev_state *per_dev = &ios->per_dev[i];

                        if (per_dev->or)
                                osd_end_request(per_dev->or);
                        if (per_dev->bio)
                                bio_put(per_dev->bio);
                }

                kfree(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;

        complete(waiting);
}

static void _last_io(struct kref *kref)
{
        struct exofs_io_state *ios = container_of(
                                        kref, struct exofs_io_state, kref);

        ios->done(ios, ios->private);
}

static void _done_io(struct osd_request *or, void *p)
{
        struct exofs_io_state *ios = p;

        kref_put(&ios->kref, _last_io);
}

static int exofs_io_execute(struct exofs_io_state *ios)
{
        DECLARE_COMPLETION_ONSTACK(wait);
        bool sync = (ios->done == NULL);
        int i, ret;

        if (sync) {
                ios->done = _sync_done;
                ios->private = &wait;
        }

        for (i = 0; i < ios->numdevs; i++) {
                struct osd_request *or = ios->per_dev[i].or;
                if (unlikely(!or))
                        continue;

                ret = osd_finalize_request(or, 0, ios->cred, NULL);
                if (unlikely(ret)) {
                        EXOFS_DBGMSG("Failed to osd_finalize_request() => %d\n",
                                     ret);
                        return ret;
                }
        }

        kref_init(&ios->kref);

        for (i = 0; i < ios->numdevs; i++) {
                struct osd_request *or = ios->per_dev[i].or;
                if (unlikely(!or))
                        continue;

                kref_get(&ios->kref);
                osd_execute_request_async(or, _done_io, ios);
        }

        kref_put(&ios->kref, _last_io);
        ret = 0;

        if (sync) {
                wait_for_completion(&wait);
                ret = exofs_check_io(ios, NULL);
        }
        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;
        int acumulated_lin_err = 0;
        int i;

        for (i = 0; i < ios->numdevs; i++) {
                struct osd_sense_info 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 (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) {
                        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;
}

/*
 * 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;
        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;
}

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("Failed 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 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;

        while (length) {
                struct exofs_per_dev_state *per_dev = &ios->per_dev[dev];
                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 < 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);
                if (unlikely(ret))
                        goto out;

                dev += mirrors_p1;
                dev = (dev % devs_in_group) + first_dev;

                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;
        u64 offset = ios->offset;
        struct _striping_info si;
        int ret = 0;

        if (!ios->pages) {
                if (ios->kern_buff) {
                        struct exofs_per_dev_state *per_dev = &ios->per_dev[0];

                        _calc_stripe_info(ios, 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, offset, &si);

                if (length < si.group_length)
                        si.group_length = length;

                ret = _prepare_one_group(ios, si.group_length, &si);
                if (unlikely(ret))
                        goto out;

                offset += si.group_length;
                length -= si.group_length;
        }

out:
        return ret;
}

int exofs_sbi_create(struct exofs_io_state *ios)
{
        int i, ret;

        for (i = 0; i < ios->layout->s_numdevs; i++) {
                struct osd_request *or;

                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++;

                osd_req_create_object(or, &ios->obj);
        }
        ret = exofs_io_execute(ios);

out:
        return ret;
}

int exofs_sbi_remove(struct exofs_io_state *ios)
{
        int i, ret;

        for (i = 0; i < ios->layout->s_numdevs; i++) {
                struct osd_request *or;

                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++;

                osd_req_remove_object(or, &ios->obj);
        }
        ret = exofs_io_execute(ios);

out:
        return ret;
}

static int _sbi_write_mirror(struct exofs_io_state *ios, int cur_comp)
{
        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;

        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(exofs_ios_od(ios, dev), GFP_KERNEL);
                if (unlikely(!or)) {
                        EXOFS_ERR("%s: osd_start_request failed\n", __func__);
                        ret = -ENOMEM;
                        goto out;
                }
                per_dev->or = or;
                per_dev->offset = master_dev->offset;

                if (ios->pages) {
                        struct bio *bio;

                        if (per_dev != master_dev) {
                                bio = bio_kmalloc(GFP_KERNEL,
                                                  master_dev->bio->bi_max_vecs);
                                if (unlikely(!bio)) {
                                        EXOFS_DBGMSG(
                                              "Failed to allocate BIO size=%u\n",
                                              master_dev->bio->bi_max_vecs);
                                        ret = -ENOMEM;
                                        goto out;
                                }

                                __bio_clone(bio, master_dev->bio);
                                bio->bi_bdev = NULL;
                                bio->bi_next = NULL;
                                per_dev->length = master_dev->length;
                                per_dev->bio =  bio;
                                per_dev->dev = dev;
                        } else {
                                bio = master_dev->bio;
                                /* FIXME: bio_set_dir() */
                                bio->bi_rw |= REQ_WRITE;
                        }

                        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) {
                        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(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, 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);
        }

out:
        return ret;
}

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[cur_comp];
        unsigned first_dev = (unsigned)ios->obj.id;

        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;
        }
        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);

        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;
}

int extract_attr_from_ios(struct exofs_io_state *ios, struct osd_attr *attr)
{
        struct osd_attr cur_attr = {.attr_page = 0}; /* start with zeros */
        void *iter = NULL;
        int nelem;

        do {
                nelem = 1;
                osd_req_decode_get_attr_list(ios->per_dev[0].or,
                                             &cur_attr, &nelem, &iter);
                if ((cur_attr.attr_page == attr->attr_page) &&
                    (cur_attr.attr_id == attr->attr_id)) {
                        attr->len = cur_attr.len;
                        attr->val_ptr = cur_attr.val_ptr;
                        return 0;
                }
        } while (iter);

        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 exofs_trunc_attr {
                struct osd_attr attr;
                __be64 newsize;
        } *size_attrs;
        struct _striping_info si;
        int i, ret;

        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;

        ios->numdevs = ios->layout->s_numdevs;
        _calc_stripe_info(ios, size, &si);

        for (i = 0; i < ios->layout->group_width; ++i) {
                struct exofs_trunc_attr *size_attr = &size_attrs[i];
                u64 obj_size;

                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;

                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;
}