X-Git-Url: https://git.whamcloud.com/?p=fs%2Flustre-release.git;a=blobdiff_plain;f=lustre%2Fofd%2Fofd_objects.c;h=32f769492613ccc8be8a94a37983d8301c16535c;hp=22c6580d3a43fe656fecabc1df236f094416f74a;hb=aa7c70a7d6f0720e82afce267415e740b23f00ec;hpb=e7d6dcdedc9c676c84e6bee3ed6cbf73d56ff791 diff --git a/lustre/ofd/ofd_objects.c b/lustre/ofd/ofd_objects.c index 22c6580..32f7694 100644 --- a/lustre/ofd/ofd_objects.c +++ b/lustre/ofd/ofd_objects.c @@ -15,11 +15,7 @@ * * You should have received a copy of the GNU General Public License * version 2 along with this program; If not, see - * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf - * - * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, - * CA 95054 USA or visit www.sun.com if you need additional information or - * have any questions. + * http://www.gnu.org/licenses/gpl-2.0.html * * GPL HEADER END */ @@ -27,7 +23,7 @@ * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved. * Use is subject to license terms. * - * Copyright (c) 2012, 2013, Intel Corporation. + * Copyright (c) 2012, 2014 Intel Corporation. */ /* * This file is part of Lustre, http://www.lustre.org/ @@ -35,24 +31,44 @@ * * lustre/ofd/ofd_objects.c * - * Author: Alex Zhuravlev - * Author: Mikhail Pershin + * This file contains OSD API methods related to OBD Filter Device (OFD) + * object operations. + * + * Author: Alex Zhuravlev + * Author: Mikhail Pershin */ #define DEBUG_SUBSYSTEM S_FILTER #include #include +#include #include "ofd_internal.h" -int ofd_version_get_check(struct ofd_thread_info *info, - struct ofd_object *fo) +/** + * Get object version from disk and check it. + * + * This function checks object version from disk with + * ofd_thread_info::fti_pre_version filled from incoming RPC. This is part of + * VBR (Version-Based Recovery) and ensures that object has the same version + * upon replay as it has during original modification. + * + * \param[in] info execution thread OFD private data + * \param[in] fo OFD object + * + * \retval 0 if version matches + * \retval -EOVERFLOW on version mismatch + */ +static int ofd_version_get_check(struct ofd_thread_info *info, + struct ofd_object *fo) { dt_obj_version_t curr_version; LASSERT(ofd_object_exists(fo)); - LASSERT(info->fti_exp); + + if (info->fti_exp == NULL) + RETURN(0); curr_version = dt_version_get(info->fti_env, ofd_object_child(fo)); if ((__s64)curr_version == -EOPNOTSUPP) @@ -71,6 +87,18 @@ int ofd_version_get_check(struct ofd_thread_info *info, RETURN(0); } +/** + * Get OFD object by FID. + * + * This function finds OFD slice of compound object with the given FID. + * + * \param[in] env execution environment + * \param[in] ofd OFD device + * \param[in] fid FID of the object + * + * \retval pointer to the found ofd_object + * \retval ERR_PTR(errno) in case of error + */ struct ofd_object *ofd_object_find(const struct lu_env *env, struct ofd_device *ofd, const struct lu_fid *fid) @@ -89,70 +117,102 @@ struct ofd_object *ofd_object_find(const struct lu_env *env, RETURN(fo); } -struct ofd_object *ofd_object_find_or_create(const struct lu_env *env, - struct ofd_device *ofd, - const struct lu_fid *fid, - struct lu_attr *attr) +/** + * Get FID of parent MDT object. + * + * This function reads extended attribute XATTR_NAME_FID of OFD object which + * contains the MDT parent object FID and saves it in ofd_object::ofo_pfid. + * + * The filter_fid::ff_parent::f_ver field currently holds + * the OST-object index in the parent MDT-object's layout EA, + * not the actual FID::f_ver of the parent. We therefore access + * it via the macro f_stripe_idx. + * + * \param[in] env execution environment + * \param[in] fo OFD object + * + * \retval 0 if successful + * \retval -ENODATA if there is no such xattr + * \retval negative value on error + */ +int ofd_object_ff_load(const struct lu_env *env, struct ofd_object *fo) { struct ofd_thread_info *info = ofd_info(env); - struct lu_object *fo_obj; - struct dt_object *dto; + struct filter_fid_old *ff = &info->fti_mds_fid_old; + struct lu_buf *buf = &info->fti_buf; + struct lu_fid *pfid = &fo->ofo_pfid; + int rc = 0; - ENTRY; + if (fid_is_sane(pfid)) + return 0; - info->fti_dof.dof_type = dt_mode_to_dft(S_IFREG); - - dto = dt_find_or_create(env, ofd->ofd_osd, fid, &info->fti_dof, attr); - if (IS_ERR(dto)) - RETURN(ERR_CAST(dto)); + buf->lb_buf = ff; + buf->lb_len = sizeof(*ff); + rc = dt_xattr_get(env, ofd_object_child(fo), buf, XATTR_NAME_FID); + if (rc < 0) + return rc; - fo_obj = lu_object_locate(dto->do_lu.lo_header, - ofd->ofd_dt_dev.dd_lu_dev.ld_type); - RETURN(ofd_obj(fo_obj)); -} + if (rc < sizeof(struct lu_fid)) { + fid_zero(pfid); -int ofd_object_ff_check(const struct lu_env *env, struct ofd_object *fo) -{ - int rc = 0; + return -ENODATA; + } - ENTRY; + pfid->f_seq = le64_to_cpu(ff->ff_parent.f_seq); + pfid->f_oid = le32_to_cpu(ff->ff_parent.f_oid); + pfid->f_stripe_idx = le32_to_cpu(ff->ff_parent.f_stripe_idx); - if (!fo->ofo_ff_exists) { - /* - * This actually means that we don't know whether the object - * has the "fid" EA or not. - */ - rc = dt_xattr_get(env, ofd_object_child(fo), &LU_BUF_NULL, - XATTR_NAME_FID, BYPASS_CAPA); - if (rc >= 0 || rc == -ENODATA) { - /* - * Here we assume that, if the object doesn't have the - * "fid" EA, the caller will add one, unless a fatal - * error (e.g., a memory or disk failure) prevents it - * from doing so. - */ - fo->ofo_ff_exists = 1; - } - if (rc > 0) - rc = 0; - } - RETURN(rc); + return 0; } +/** + * Put OFD object reference. + * + * \param[in] env execution environment + * \param[in] fo OFD object + */ void ofd_object_put(const struct lu_env *env, struct ofd_object *fo) { lu_object_put(env, &fo->ofo_obj.do_lu); } +/** + * Precreate the given number \a nr of objects in the given sequence \a oseq. + * + * This function precreates new OST objects in the given sequence. + * The precreation starts from \a id and creates \a nr objects sequentially. + * + * Notes: + * This function may create fewer objects than requested. + * + * We mark object SUID+SGID to flag it for accepting UID+GID from client on + * first write. Currently the permission bits on the OST are never used, + * so this is OK. + * + * Initialize a/c/m time so any client timestamp will always be newer and + * update the inode. The ctime = 0 case is also handled specially in + * osd_inode_setattr(). See LU-221, LU-1042 for details. + * + * \param[in] env execution environment + * \param[in] ofd OFD device + * \param[in] id object ID to start precreation from + * \param[in] oseq object sequence + * \param[in] nr number of objects to precreate + * \param[in] sync synchronous precreation flag + * + * \retval 0 if successful + * \retval negative value on error + */ int ofd_precreate_objects(const struct lu_env *env, struct ofd_device *ofd, - obd_id id, struct ofd_seq *oseq, int nr, int sync) + u64 id, struct ofd_seq *oseq, int nr, int sync) { struct ofd_thread_info *info = ofd_info(env); struct ofd_object *fo = NULL; struct dt_object *next; struct thandle *th; struct ofd_object **batch; - obd_id tmp; + struct lu_fid *fid = &info->fti_fid; + u64 tmp; int rc; int i; int objects = 0; @@ -178,28 +238,21 @@ int ofd_precreate_objects(const struct lu_env *env, struct ofd_device *ofd, RETURN(-ENOMEM); info->fti_attr.la_valid = LA_TYPE | LA_MODE; - /* - * We mark object SUID+SGID to flag it for accepting UID+GID from - * client on first write. Currently the permission bits on the OST are - * never used, so this is OK. - */ info->fti_attr.la_mode = S_IFREG | S_ISUID | S_ISGID | 0666; info->fti_dof.dof_type = dt_mode_to_dft(S_IFREG); - /* Initialize a/c/m time so any client timestamp will always - * be newer and update the inode. ctime = 0 is also handled - * specially in osd_inode_setattr(). See LU-221, LU-1042 */ info->fti_attr.la_valid |= LA_ATIME | LA_MTIME | LA_CTIME; info->fti_attr.la_atime = 0; info->fti_attr.la_mtime = 0; info->fti_attr.la_ctime = 0; + LASSERT(id != 0); + /* prepare objects */ - ostid_set_seq(&info->fti_ostid, ostid_seq(&oseq->os_oi)); + *fid = *lu_object_fid(&oseq->os_lastid_obj->do_lu); for (i = 0; i < nr; i++) { - ostid_set_id(&info->fti_ostid, id + i); - rc = ostid_to_fid(&info->fti_fid, &info->fti_ostid, 0); - if (rc) { + rc = fid_set_id(fid, id + i); + if (rc != 0) { if (i == 0) GOTO(out, rc); @@ -207,7 +260,7 @@ int ofd_precreate_objects(const struct lu_env *env, struct ofd_device *ofd, break; } - fo = ofd_object_find(env, ofd, &info->fti_fid); + fo = ofd_object_find(env, ofd, fid); if (IS_ERR(fo)) { if (i == 0) GOTO(out, rc = PTR_ERR(fo)); @@ -229,7 +282,7 @@ int ofd_precreate_objects(const struct lu_env *env, struct ofd_device *ofd, th->th_sync |= sync; - rc = dt_declare_record_write(env, oseq->os_lastid_obj, sizeof(tmp), + rc = dt_declare_record_write(env, oseq->os_lastid_obj, &info->fti_buf, info->fti_off, th); if (rc) GOTO(trans_stop, rc); @@ -242,7 +295,7 @@ int ofd_precreate_objects(const struct lu_env *env, struct ofd_device *ofd, /* object may exist being re-created by write replay */ CDEBUG(D_INODE, "object "LPX64"/"LPX64" exists: " DFID"\n", ostid_seq(&oseq->os_oi), id, - PFID(&info->fti_fid)); + PFID(lu_object_fid(&fo->ofo_obj.do_lu))); continue; } @@ -251,7 +304,10 @@ int ofd_precreate_objects(const struct lu_env *env, struct ofd_device *ofd, rc = dt_declare_create(env, next, &info->fti_attr, NULL, &info->fti_dof, th); - if (rc) { + if (rc < 0) { + if (i == 0) + GOTO(trans_stop, rc); + nr = i; break; } @@ -262,31 +318,83 @@ int ofd_precreate_objects(const struct lu_env *env, struct ofd_device *ofd, GOTO(trans_stop, rc); CDEBUG(D_OTHER, "%s: create new object "DFID" nr %d\n", - ofd_name(ofd), PFID(&info->fti_fid), nr); + ofd_name(ofd), PFID(fid), nr); + + /* When the LFSCK scanning the whole device to verify the LAST_ID file + * consistency, it will load the last_id into RAM firstly, and compare + * the last_id with each OST-object's ID. If the later one is larger, + * then it will regard the LAST_ID file crashed. But during the LFSCK + * scanning, the OFD may continue to create new OST-objects. Those new + * created OST-objects will have larger IDs than the LFSCK known ones. + * So from the LFSCK view, it needs to re-load the last_id from disk + * file, and if the latest last_id is still smaller than the object's + * ID, then the LAST_ID file is real crashed. + * + * To make above mechanism to work, before OFD pre-create OST-objects, + * it needs to update the LAST_ID file firstly, otherwise, the LFSCK + * may cannot get latest last_id although new OST-object created. */ + if (!OBD_FAIL_CHECK(OBD_FAIL_LFSCK_SKIP_LASTID)) { + tmp = cpu_to_le64(id + nr - 1); + dt_write_lock(env, oseq->os_lastid_obj, 0); + rc = dt_record_write(env, oseq->os_lastid_obj, + &info->fti_buf, &info->fti_off, th); + dt_write_unlock(env, oseq->os_lastid_obj); + if (rc != 0) + GOTO(trans_stop, rc); + } for (i = 0; i < nr; i++) { fo = batch[i]; LASSERT(fo); - if (likely(!ofd_object_exists(fo))) { + /* Only the new created objects need to be recorded. */ + if (ofd->ofd_osd->dd_record_fid_accessed) { + struct lfsck_request *lr = &ofd_info(env)->fti_lr; + + lfsck_pack_rfa(lr, lu_object_fid(&fo->ofo_obj.do_lu), + LE_FID_ACCESSED, + LFSCK_TYPE_LAYOUT); + lfsck_in_notify(env, ofd->ofd_osd, lr, NULL); + } + + if (likely(!ofd_object_exists(fo) && + !OBD_FAIL_CHECK(OBD_FAIL_LFSCK_DANGLING))) { next = ofd_object_child(fo); LASSERT(next != NULL); rc = dt_create(env, next, &info->fti_attr, NULL, &info->fti_dof, th); - if (rc) + if (rc < 0) { + if (i == 0) + GOTO(trans_stop, rc); + + rc = 0; break; + } LASSERT(ofd_object_exists(fo)); } ofd_seq_last_oid_set(oseq, id + i); } objects = i; - if (objects > 0) { + /* NOT all the wanted objects have been created, + * set the LAST_ID as the real created. */ + if (unlikely(objects < nr)) { + int rc1; + + info->fti_off = 0; tmp = cpu_to_le64(ofd_seq_last_oid(oseq)); - rc = dt_record_write(env, oseq->os_lastid_obj, - &info->fti_buf, &info->fti_off, th); + dt_write_lock(env, oseq->os_lastid_obj, 0); + rc1 = dt_record_write(env, oseq->os_lastid_obj, + &info->fti_buf, &info->fti_off, th); + dt_write_unlock(env, oseq->os_lastid_obj); + if (rc1 != 0) + CERROR("%s: fail to reset the LAST_ID for seq ("LPX64 + ") from "LPU64" to "LPU64"\n", ofd_name(ofd), + ostid_seq(&oseq->os_oi), id + nr - 1, + ofd_seq_last_oid(oseq)); } + trans_stop: ofd_trans_stop(env, ofd, th, rc); out: @@ -306,11 +414,22 @@ out: RETURN(objects > 0 ? objects : rc); } -/* - * If the object still has SUID+SGID bits set (see ofd_precreate_object()) then - * we will accept the UID+GID if sent by the client for initializing the +/** + * Fix the OFD object ownership. + * + * If the object still has SUID+SGID bits set, meaning that it was precreated + * by the MDT before it was assigned to any file, (see ofd_precreate_objects()) + * then we will accept the UID+GID if sent by the client for initializing the * ownership of this object. We only allow this to happen once (so clear these * bits) and later only allow setattr. + * + * \param[in] env execution environment + * \param[in] fo OFD object + * \param[in] la object attributes + * \param[in] is_setattr was this function called from setattr or not + * + * \retval 0 if successful + * \retval negative value on error */ int ofd_attr_handle_ugid(const struct lu_env *env, struct ofd_object *fo, struct lu_attr *la, int is_setattr) @@ -325,7 +444,7 @@ int ofd_attr_handle_ugid(const struct lu_env *env, struct ofd_object *fo, if (!(la->la_valid & LA_UID) && !(la->la_valid & LA_GID)) RETURN(0); - rc = dt_attr_get(env, ofd_object_child(fo), ln, BYPASS_CAPA); + rc = dt_attr_get(env, ofd_object_child(fo), ln); if (rc != 0) RETURN(rc); @@ -353,6 +472,22 @@ int ofd_attr_handle_ugid(const struct lu_env *env, struct ofd_object *fo, RETURN(0); } +/** + * Set OFD object attributes. + * + * This function sets OFD object attributes taken from incoming request. + * It sets not only regular attributes but also XATTR_NAME_FID extended + * attribute if needed. The "fid" xattr allows the object's MDT parent inode + * to be found and verified by LFSCK and other tools in case of inconsistency. + * + * \param[in] env execution environment + * \param[in] fo OFD object + * \param[in] la object attributes + * \param[in] ff filter_fid structure, contains additional attributes + * + * \retval 0 if successful + * \retval negative value on error + */ int ofd_attr_set(const struct lu_env *env, struct ofd_object *fo, struct lu_attr *la, struct filter_fid *ff) { @@ -385,7 +520,7 @@ int ofd_attr_set(const struct lu_env *env, struct ofd_object *fo, GOTO(unlock, rc); if (ff != NULL) { - rc = ofd_object_ff_check(env, fo); + rc = ofd_object_ff_load(env, fo); if (rc == -ENODATA) ff_needed = 1; else if (rc < 0) @@ -414,25 +549,57 @@ int ofd_attr_set(const struct lu_env *env, struct ofd_object *fo, if (rc) GOTO(stop, rc); - rc = dt_attr_set(env, ofd_object_child(fo), la, th, - ofd_object_capa(env, fo)); + rc = dt_attr_set(env, ofd_object_child(fo), la, th); if (rc) GOTO(stop, rc); - if (ff_needed) + if (ff_needed) { rc = dt_xattr_set(env, ofd_object_child(fo), &info->fti_buf, - XATTR_NAME_FID, 0, th, BYPASS_CAPA); + XATTR_NAME_FID, 0, th); + if (rc == 0) { + fo->ofo_pfid.f_seq = le64_to_cpu(ff->ff_parent.f_seq); + fo->ofo_pfid.f_oid = le32_to_cpu(ff->ff_parent.f_oid); + /* Currently, the filter_fid::ff_parent::f_ver is not + * the real parent MDT-object's FID::f_ver, instead it + * is the OST-object index in its parent MDT-object's + * layout EA. */ + fo->ofo_pfid.f_stripe_idx = + le32_to_cpu(ff->ff_parent.f_stripe_idx); + } + } + + GOTO(stop, rc); stop: ofd_trans_stop(env, ofd, th, rc); unlock: ofd_write_unlock(env, fo); - RETURN(rc); + + return rc; } +/** + * Truncate/punch OFD object. + * + * This function frees all of the allocated object's space from the \a start + * offset to the \a end offset. For truncate() operations the \a end offset + * is OBD_OBJECT_EOF. The functionality to punch holes in an object via + * fallocate(FALLOC_FL_PUNCH_HOLE) is not yet implemented (see LU-3606). + * + * \param[in] env execution environment + * \param[in] fo OFD object + * \param[in] start start offset to punch from + * \param[in] end end of punch + * \param[in] la object attributes + * \param[in] ff filter_fid structure + * \param[in] oa obdo struct from incoming request + * + * \retval 0 if successful + * \retval negative value on error + */ int ofd_object_punch(const struct lu_env *env, struct ofd_object *fo, __u64 start, __u64 end, struct lu_attr *la, - struct filter_fid *ff) + struct filter_fid *ff, struct obdo *oa) { struct ofd_thread_info *info = ofd_info(env); struct ofd_device *ofd = ofd_obj2dev(fo); @@ -447,15 +614,21 @@ int ofd_object_punch(const struct lu_env *env, struct ofd_object *fo, /* we support truncate, not punch yet */ LASSERT(end == OBD_OBJECT_EOF); + ofd_write_lock(env, fo); fmd = ofd_fmd_get(info->fti_exp, &fo->ofo_header.loh_fid); if (fmd && fmd->fmd_mactime_xid < info->fti_xid) fmd->fmd_mactime_xid = info->fti_xid; ofd_fmd_put(info->fti_exp, fmd); - ofd_write_lock(env, fo); if (!ofd_object_exists(fo)) GOTO(unlock, rc = -ENOENT); + if (ofd->ofd_lfsck_verify_pfid && oa->o_valid & OBD_MD_FLFID) { + rc = ofd_verify_ff(env, fo, oa); + if (rc != 0) + GOTO(unlock, rc); + } + /* VBR: version recovery check */ rc = ofd_version_get_check(info, fo); if (rc) @@ -466,7 +639,7 @@ int ofd_object_punch(const struct lu_env *env, struct ofd_object *fo, GOTO(unlock, rc); if (ff != NULL) { - rc = ofd_object_ff_check(env, fo); + rc = ofd_object_ff_load(env, fo); if (rc == -ENODATA) ff_needed = 1; else if (rc < 0) @@ -499,26 +672,53 @@ int ofd_object_punch(const struct lu_env *env, struct ofd_object *fo, if (rc) GOTO(stop, rc); - rc = dt_punch(env, dob, start, OBD_OBJECT_EOF, th, - ofd_object_capa(env, fo)); + rc = dt_punch(env, dob, start, OBD_OBJECT_EOF, th); if (rc) GOTO(stop, rc); - rc = dt_attr_set(env, dob, la, th, ofd_object_capa(env, fo)); + rc = dt_attr_set(env, dob, la, th); if (rc) GOTO(stop, rc); - if (ff_needed) + if (ff_needed) { rc = dt_xattr_set(env, ofd_object_child(fo), &info->fti_buf, - XATTR_NAME_FID, 0, th, BYPASS_CAPA); + XATTR_NAME_FID, 0, th); + if (rc == 0) { + fo->ofo_pfid.f_seq = le64_to_cpu(ff->ff_parent.f_seq); + fo->ofo_pfid.f_oid = le32_to_cpu(ff->ff_parent.f_oid); + /* Currently, the filter_fid::ff_parent::f_ver is not + * the real parent MDT-object's FID::f_ver, instead it + * is the OST-object index in its parent MDT-object's + * layout EA. */ + fo->ofo_pfid.f_stripe_idx = + le32_to_cpu(ff->ff_parent.f_stripe_idx); + } + } + + GOTO(stop, rc); stop: ofd_trans_stop(env, ofd, th, rc); unlock: ofd_write_unlock(env, fo); - RETURN(rc); + + return rc; } +/** + * Destroy OFD object. + * + * This function destroys OFD object. If object wasn't used at all (orphan) + * then local transaction is used, which means the transaction data is not + * returned back in reply. + * + * \param[in] env execution environment + * \param[in] fo OFD object + * \param[in] orphan flag to indicate that object is orphaned + * + * \retval 0 if successful + * \retval negative value on error + */ int ofd_object_destroy(const struct lu_env *env, struct ofd_object *fo, int orphan) { @@ -536,8 +736,14 @@ int ofd_object_destroy(const struct lu_env *env, struct ofd_object *fo, if (IS_ERR(th)) GOTO(unlock, rc = PTR_ERR(th)); - dt_declare_ref_del(env, ofd_object_child(fo), th); - dt_declare_destroy(env, ofd_object_child(fo), th); + rc = dt_declare_ref_del(env, ofd_object_child(fo), th); + if (rc < 0) + GOTO(stop, rc); + + rc = dt_declare_destroy(env, ofd_object_child(fo), th); + if (rc < 0) + GOTO(stop, rc); + if (orphan) rc = dt_trans_start_local(env, ofd->ofd_osd, th); else @@ -556,6 +762,19 @@ unlock: RETURN(rc); } +/** + * Get OFD object attributes. + * + * This function gets OFD object regular attributes. It is used to serve + * incoming request as well as for local OFD purposes. + * + * \param[in] env execution environment + * \param[in] fo OFD object + * \param[in] la object attributes + * + * \retval 0 if successful + * \retval negative value on error + */ int ofd_attr_get(const struct lu_env *env, struct ofd_object *fo, struct lu_attr *la) { @@ -564,25 +783,7 @@ int ofd_attr_get(const struct lu_env *env, struct ofd_object *fo, ENTRY; if (ofd_object_exists(fo)) { - rc = dt_attr_get(env, ofd_object_child(fo), la, - ofd_object_capa(env, fo)); - -#if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(2, 7, 50, 0) - /* Try to correct for a bug in 2.1.0 (LU-221) that caused - * negative timestamps to appear to be in the far future, - * due old timestamp being stored on disk as an unsigned value. - * This fixes up any bad values stored on disk before - * returning them to the client, and ensures any timestamp - * updates are correct. LU-1042 */ - if (unlikely(la->la_atime == LU221_BAD_TIME)) - la->la_atime = 0; - if (unlikely(la->la_mtime == LU221_BAD_TIME)) - la->la_mtime = 0; - if (unlikely(la->la_ctime == LU221_BAD_TIME)) - la->la_ctime = 0; -#else -#warning "remove old LU-221/LU-1042 workaround code" -#endif + rc = dt_attr_get(env, ofd_object_child(fo), la); } else { rc = -ENOENT; }