static int llog_lvfs_read_header(struct llog_handle *handle)
{
struct obd_device *obd;
int rc;
ENTRY;
LASSERT(sizeof(*handle->lgh_hdr) == LLOG_CHUNK_SIZE);
obd = handle->lgh_ctxt->loc_exp->exp_obd;
if (i_size_read(handle->lgh_file->f_dentry->d_inode) == 0) {
CDEBUG(D_HA, "not reading header from 0-byte log\n");
RETURN(LLOG_EEMPTY);
}
rc = llog_lvfs_read_blob(obd, handle->lgh_file, handle->lgh_hdr,
LLOG_CHUNK_SIZE, 0);
if (rc) {
CERROR("error reading log header from %.*s\n",
handle->lgh_file->f_dentry->d_name.len,
handle->lgh_file->f_dentry->d_name.name);
} else {
struct llog_rec_hdr *llh_hdr = &handle->lgh_hdr->llh_hdr;
if (LLOG_REC_HDR_NEEDS_SWABBING(llh_hdr))
lustre_swab_llog_hdr(handle->lgh_hdr);
if (llh_hdr->lrh_type != LLOG_HDR_MAGIC) {
CERROR("bad log %.*s header magic: %#x (expected %#x)\n",
handle->lgh_file->f_dentry->d_name.len,
handle->lgh_file->f_dentry->d_name.name,
llh_hdr->lrh_type, LLOG_HDR_MAGIC);
rc = -EIO;
} else if (llh_hdr->lrh_len != LLOG_CHUNK_SIZE) {
CERROR("incorrectly sized log %.*s header: %#x "
"(expected %#x)\n",
handle->lgh_file->f_dentry->d_name.len,
handle->lgh_file->f_dentry->d_name.name,
llh_hdr->lrh_len, LLOG_CHUNK_SIZE);
CERROR("you may need to re-run lconf --write_conf.\n");
rc = -EIO;
}
}
handle->lgh_last_idx = handle->lgh_hdr->llh_tail.lrt_index;
handle->lgh_file->f_pos = i_size_read(handle->lgh_file->f_dentry->d_inode);
RETURN(rc);
}
/**
* Implementation of the llog_operations::lop_read_header
*
* This function reads the current llog header from the bottom storage
* device.
*
* \param[in] env execution environment
* \param[in] handle llog handle of the current llog
*
* \retval 0 on successful header read
* \retval negative error if read failed
*/
static int llog_osd_read_header(const struct lu_env *env,
struct llog_handle *handle)
{
struct llog_rec_hdr *llh_hdr;
struct dt_object *o;
struct llog_thread_info *lgi;
int rc;
ENTRY;
LASSERT(sizeof(*handle->lgh_hdr) == LLOG_CHUNK_SIZE);
o = handle->lgh_obj;
LASSERT(o);
lgi = llog_info(env);
rc = dt_attr_get(env, o, &lgi->lgi_attr, NULL);
if (rc)
RETURN(rc);
LASSERT(lgi->lgi_attr.la_valid & LA_SIZE);
if (lgi->lgi_attr.la_size == 0) {
CDEBUG(D_HA, "not reading header from 0-byte log\n");
RETURN(LLOG_EEMPTY);
}
lgi->lgi_off = 0;
lgi->lgi_buf.lb_buf = handle->lgh_hdr;
lgi->lgi_buf.lb_len = LLOG_CHUNK_SIZE;
rc = dt_record_read(env, o, &lgi->lgi_buf, &lgi->lgi_off);
if (rc) {
CERROR("%s: error reading log header from "DFID": rc = %d\n",
o->do_lu.lo_dev->ld_obd->obd_name,
PFID(lu_object_fid(&o->do_lu)), rc);
RETURN(rc);
}
llh_hdr = &handle->lgh_hdr->llh_hdr;
if (LLOG_REC_HDR_NEEDS_SWABBING(llh_hdr))
lustre_swab_llog_hdr(handle->lgh_hdr);
if (llh_hdr->lrh_type != LLOG_HDR_MAGIC) {
CERROR("%s: bad log %s "DFID" header magic: %#x "
"(expected %#x)\n", o->do_lu.lo_dev->ld_obd->obd_name,
handle->lgh_name ? handle->lgh_name : "",
PFID(lu_object_fid(&o->do_lu)),
llh_hdr->lrh_type, LLOG_HDR_MAGIC);
RETURN(-EIO);
} else if (llh_hdr->lrh_len != LLOG_CHUNK_SIZE) {
CERROR("%s: incorrectly sized log %s "DFID" header: "
"%#x (expected %#x)\n"
"you may need to re-run lconf --write_conf.\n",
o->do_lu.lo_dev->ld_obd->obd_name,
handle->lgh_name ? handle->lgh_name : "",
PFID(lu_object_fid(&o->do_lu)),
llh_hdr->lrh_len, LLOG_CHUNK_SIZE);
RETURN(-EIO);
}
handle->lgh_last_idx = handle->lgh_hdr->llh_tail.lrt_index;
RETURN(0);
}
