lov_pack.c

lustre 1.6.5 source code

        
        LASSERT(lsm_op_find(lsm->lsm_magic) != NULL);
        lsm_op_find(lsm->lsm_magic)->lsm_free(lsm);
        
        *lsmp = NULL;
}


/* Unpack LOV object metadata from disk storage.  It is packed in LE byte
 * order and is opaque to the networking layer.
 */
int lov_unpackmd(struct obd_export *exp,  struct lov_stripe_md **lsmp, 
                 struct lov_mds_md *lmm, int lmm_bytes)
{
        struct obd_device *obd = class_exp2obd(exp);
        struct lov_obd *lov = &obd->u.lov;
        int rc = 0, stripe_count, lsm_size;
        __u32 magic;
        ENTRY;

        /* If passed an MDS struct use values from there, otherwise defaults */
        if (lmm) {
                rc = lov_verify_lmm(lmm, lmm_bytes, &stripe_count);
                if (rc)
                        RETURN(rc);
                magic = le32_to_cpu(lmm->lmm_magic);
        } else {
                stripe_count = lov_get_stripecnt(lov, 0);
                magic = LOV_MAGIC;
        }

        /* If we aren't passed an lsmp struct, we just want the size */
        if (!lsmp) {
                /* XXX LOV STACKING call into osc for sizes */
                LBUG();
                RETURN(lov_stripe_md_size(stripe_count));
        }

        /* If we are passed an allocated struct but nothing to unpack, free */
        if (*lsmp && !lmm) {
                lov_free_memmd(lsmp);
                RETURN(0);
        }

        lsm_size = lov_alloc_memmd(lsmp, stripe_count, LOV_PATTERN_RAID0, 
                                   magic);
        if (lsm_size < 0)
                RETURN(lsm_size);

        /* If we are passed a pointer but nothing to unpack, we only alloc */
        if (!lmm)
                RETURN(lsm_size);

        LASSERT(lsm_op_find(magic) != NULL);
        rc = lsm_op_find(magic)->lsm_unpackmd(lov, *lsmp, lmm);
        if (rc) {
                lov_free_memmd(lsmp);
                RETURN(rc);
        }

        RETURN(lsm_size);
}

/* Configure object striping information on a new file.
 *
 * @lmmu is a pointer to a user struct with one or more of the fields set to
 * indicate the application preference: lmm_stripe_count, lmm_stripe_size,
 * lmm_stripe_offset, and lmm_stripe_pattern.  lmm_magic must be LOV_MAGIC.
 * @lsmp is a pointer to an in-core stripe MD that needs to be filled in.
 */
int lov_setstripe(struct obd_export *exp, struct lov_stripe_md **lsmp,
                  struct lov_user_md *lump)
{
        struct obd_device *obd = class_exp2obd(exp);
        struct lov_obd *lov = &obd->u.lov;
        struct lov_user_md lum;
        int stripe_count;
        int rc;
        ENTRY;

        rc = copy_from_user(&lum, lump, sizeof(lum));
        if (rc)
                RETURN(-EFAULT);

        if (lum.lmm_magic != LOV_USER_MAGIC) {
                if (lum.lmm_magic == __swab32(LOV_USER_MAGIC)) {
                        lustre_swab_lov_user_md(&lum);
                } else {
                        CDEBUG(D_IOCTL, "bad userland LOV MAGIC:"
                               " %#08x != %#08x\n",
                               lum.lmm_magic, LOV_USER_MAGIC);
                        RETURN(-EINVAL);
                }
        }

        if (lum.lmm_pattern == 0) {
                lum.lmm_pattern = lov->desc.ld_pattern ?
                        lov->desc.ld_pattern : LOV_PATTERN_RAID0;
        }

        if (lum.lmm_pattern != LOV_PATTERN_RAID0) {
                CDEBUG(D_IOCTL, "bad userland stripe pattern: %#x\n",
                       lum.lmm_pattern);
                RETURN(-EINVAL);
        }

        /* 64kB is the largest common page size we see (ia64), and matches the
         * check in lfs */
        if (lum.lmm_stripe_size & (LOV_MIN_STRIPE_SIZE - 1)) {
                CDEBUG(D_IOCTL, "stripe size %u not multiple of %u, fixing\n",
                       lum.lmm_stripe_size, LOV_MIN_STRIPE_SIZE);
                lum.lmm_stripe_size = LOV_MIN_STRIPE_SIZE;
        }

        if ((lum.lmm_stripe_offset >= lov->desc.ld_tgt_count) &&
            (lum.lmm_stripe_offset != (typeof(lum.lmm_stripe_offset))(-1))) {
                CDEBUG(D_IOCTL, "stripe offset %u > number of OSTs %u\n",
                       lum.lmm_stripe_offset, lov->desc.ld_tgt_count);
                RETURN(-EINVAL);
        }
        stripe_count = lov_get_stripecnt(lov, lum.lmm_stripe_count);

        if ((__u64)lum.lmm_stripe_size * stripe_count > ~0U) {
                CDEBUG(D_IOCTL, "stripe width %ux%u exceeds %u bytes\n",
                       lum.lmm_stripe_size, (int)lum.lmm_stripe_count, ~0U);
                RETURN(-EINVAL);
        }

        rc = lov_alloc_memmd(lsmp, stripe_count, lum.lmm_pattern, LOV_MAGIC);

        if (rc < 0)
                RETURN(rc);

        (*lsmp)->lsm_oinfo[0]->loi_ost_idx = lum.lmm_stripe_offset;
        (*lsmp)->lsm_stripe_size = lum.lmm_stripe_size;

        RETURN(0);
}

int lov_setea(struct obd_export *exp, struct lov_stripe_md **lsmp,
              struct lov_user_md *lump)
{
        int i;
        int rc;
        struct obd_export *oexp;
        struct lov_obd *lov = &exp->exp_obd->u.lov;
        obd_id last_id = 0;

        ENTRY;
        for (i = 0; i < lump->lmm_stripe_count; i++) {
                __u32 len = sizeof(last_id);
                oexp = lov->lov_tgts[lump->lmm_objects[i].l_ost_idx]->ltd_exp;
                rc = obd_get_info(oexp, strlen("last_id"), "last_id",
                                  &len, &last_id);
                if (rc)
                        RETURN(rc);
                if (lump->lmm_objects[i].l_object_id > last_id) {
                        CERROR("Setting EA for object > than last id on "
                               "ost idx %d "LPD64" > "LPD64" \n",
                               lump->lmm_objects[i].l_ost_idx,
                               lump->lmm_objects[i].l_object_id, last_id);
                        RETURN(-EINVAL);
                }
        }

        rc = lov_setstripe(exp, lsmp, lump);
        if (rc)
                RETURN(rc);

        for (i = 0; i < lump->lmm_stripe_count; i++) {
                (*lsmp)->lsm_oinfo[i]->loi_ost_idx =
                        lump->lmm_objects[i].l_ost_idx;
                (*lsmp)->lsm_oinfo[i]->loi_id = lump->lmm_objects[i].l_object_id;
                (*lsmp)->lsm_oinfo[i]->loi_gr = lump->lmm_objects[i].l_object_gr;
        }
        RETURN(0);
}


/* Retrieve object striping information.
 *
 * @lump is a pointer to an in-core struct with lmm_ost_count indicating
 * the maximum number of OST indices which will fit in the user buffer.
 * lmm_magic must be LOV_USER_MAGIC.
 */
int lov_getstripe(struct obd_export *exp, struct lov_stripe_md *lsm,
                  struct lov_user_md *lump)
{
        struct lov_user_md lum;
        struct lov_mds_md *lmmk = NULL;
        int rc, lmm_size;
        ENTRY;

        if (!lsm)
                RETURN(-ENODATA);

        rc = copy_from_user(&lum, lump, sizeof(lum));
        if (rc)
                RETURN(-EFAULT);

        if (lum.lmm_magic != LOV_USER_MAGIC)
                RETURN(-EINVAL);

        rc = lov_packmd(exp, &lmmk, lsm);
        if (rc < 0)
                RETURN(rc);
        lmm_size = rc;
        rc = 0;

        /* FIXME: Bug 1185 - copy fields properly when structs change */
        LASSERT(sizeof(lum) == sizeof(*lmmk));
        LASSERT(sizeof(lum.lmm_objects[0]) == sizeof(lmmk->lmm_objects[0]));

        /* User wasn't expecting this many OST entries */
        if (lum.lmm_stripe_count == 0) {
                if (copy_to_user(lump, lmmk, sizeof(lum)))
                        rc = -EFAULT;
        } else if (lum.lmm_stripe_count < lmmk->lmm_stripe_count) {
                rc = -EOVERFLOW;
        } else if (copy_to_user(lump, lmmk, lmm_size)) {
                rc = -EFAULT;
        }

        obd_free_diskmd(exp, &lmmk);

        RETURN(rc);
}