/* Unpack LOV object metadata from disk storage. It is packed in LE byte
* order and is opaque to the networking layer.
*/
struct lov_stripe_md *lov_unpackmd(struct lov_obd *lov, struct lov_mds_md *lmm,
size_t lmm_size)
{
struct lov_stripe_md *lsm;
u16 stripe_count;
u32 pattern;
u32 magic;
int rc;
rc = lov_verify_lmm(lmm, lmm_size, &stripe_count);
if (rc)
return ERR_PTR(rc);
magic = le32_to_cpu(lmm->lmm_magic);
pattern = le32_to_cpu(lmm->lmm_pattern);
lsm = lov_lsm_alloc(stripe_count, pattern, magic);
if (IS_ERR(lsm))
return lsm;
LASSERT(lsm_op_find(magic));
rc = lsm_op_find(magic)->lsm_unpackmd(lov, lsm, lmm);
if (rc) {
lov_free_memmd(&lsm);
return ERR_PTR(rc);
}
return lsm;
}
/* 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, lsm_size;
__u16 stripe_count;
__u32 magic;
__u32 pattern;
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);
pattern = le32_to_cpu(lmm->lmm_pattern);
} else {
magic = LOV_MAGIC;
stripe_count = lov_get_stripecnt(lov, magic, 0);
pattern = LOV_PATTERN_RAID0;
}
/* 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, pattern, 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);
}
