+/*
+ * GPL HEADER START
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 only,
+ * as published by the Free Software Foundation.
+ *
+ * This program 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 version 2 for more details (a copy is included
+ * in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; If not, see
+ * http://www.gnu.org/licenses/gpl-2.0.html
+ *
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2012, 2017 Intel Corporation.
+ */
+/*
+ * lustre/mdt/mdt_io.c
+ *
+ * Author: Mikhail Pershin <mike.pershin@intel.com>
+ */
+
+#define DEBUG_SUBSYSTEM S_FILTER
+
+#include <dt_object.h>
+#include "mdt_internal.h"
+
+/* --------------- MDT grant code ---------------- */
+
+long mdt_grant_connect(const struct lu_env *env,
+ struct obd_export *exp,
+ u64 want, bool conservative)
+{
+ struct mdt_device *mdt = mdt_exp2dev(exp);
+ u64 left;
+ long grant;
+
+ ENTRY;
+
+ dt_statfs(env, mdt->mdt_bottom, &mdt->mdt_osfs);
+
+ left = (mdt->mdt_osfs.os_bavail * mdt->mdt_osfs.os_bsize) / 2;
+
+ grant = left;
+
+ CDEBUG(D_CACHE, "%s: cli %s/%p ocd_grant: %ld want: %llu left: %llu\n",
+ exp->exp_obd->obd_name, exp->exp_client_uuid.uuid,
+ exp, grant, want, left);
+
+ return grant;
+}
+
+void mdt_grant_prepare_write(const struct lu_env *env,
+ struct obd_export *exp, struct obdo *oa,
+ struct niobuf_remote *rnb, int niocount)
+{
+ struct mdt_device *mdt = mdt_exp2dev(exp);
+ u64 left;
+
+ ENTRY;
+
+ left = (mdt->mdt_osfs.os_bavail * mdt->mdt_osfs.os_bsize) / 2;
+
+ /* grant more space back to the client if possible */
+ oa->o_grant = left;
+}
+/* ---------------- end of MDT grant code ---------------- */
+
+/* functions below are stubs for now, they will be implemented with
+ * grant support on MDT */
+static inline void mdt_io_counter_incr(struct obd_export *exp, int opcode,
+ char *jobid, long amount)
+{
+ return;
+}
+
+void mdt_grant_prepare_read(const struct lu_env *env,
+ struct obd_export *exp, struct obdo *oa)
+{
+ return;
+}
+
+void mdt_grant_commit(struct obd_export *exp, unsigned long pending,
+ int rc)
+{
+ return;
+
+}
+
+static inline void mdt_dom_read_lock(struct mdt_object *mo)
+{
+ down_read(&mo->mot_dom_sem);
+}
+
+static inline void mdt_dom_read_unlock(struct mdt_object *mo)
+{
+ up_read(&mo->mot_dom_sem);
+}
+
+static inline void mdt_dom_write_lock(struct mdt_object *mo)
+{
+ down_write(&mo->mot_dom_sem);
+}
+
+static inline void mdt_dom_write_unlock(struct mdt_object *mo)
+{
+ up_write(&mo->mot_dom_sem);
+}
+
+static int mdt_preprw_read(const struct lu_env *env, struct obd_export *exp,
+ struct mdt_device *mdt, struct mdt_object *mo,
+ struct lu_attr *la, int niocount,
+ struct niobuf_remote *rnb, int *nr_local,
+ struct niobuf_local *lnb, char *jobid)
+{
+ struct dt_object *dob;
+ int i, j, rc, tot_bytes = 0;
+
+ ENTRY;
+
+ mdt_dom_read_lock(mo);
+ if (!mdt_object_exists(mo))
+ GOTO(unlock, rc = -ENOENT);
+
+ dob = mdt_obj2dt(mo);
+ /* parse remote buffers to local buffers and prepare the latter */
+ *nr_local = 0;
+ for (i = 0, j = 0; i < niocount; i++) {
+ rc = dt_bufs_get(env, dob, rnb + i, lnb + j, 0);
+ if (unlikely(rc < 0))
+ GOTO(buf_put, rc);
+ /* correct index for local buffers to continue with */
+ j += rc;
+ *nr_local += rc;
+ tot_bytes += rnb[i].rnb_len;
+ }
+
+ rc = dt_attr_get(env, dob, la);
+ if (unlikely(rc))
+ GOTO(buf_put, rc);
+
+ rc = dt_read_prep(env, dob, lnb, *nr_local);
+ if (unlikely(rc))
+ GOTO(buf_put, rc);
+
+ mdt_io_counter_incr(exp, LPROC_MDT_IO_READ, jobid, tot_bytes);
+ RETURN(0);
+buf_put:
+ dt_bufs_put(env, dob, lnb, *nr_local);
+unlock:
+ mdt_dom_read_unlock(mo);
+ return rc;
+}
+
+static int mdt_preprw_write(const struct lu_env *env, struct obd_export *exp,
+ struct mdt_device *mdt, struct mdt_object *mo,
+ struct lu_attr *la, struct obdo *oa,
+ int objcount, struct obd_ioobj *obj,
+ struct niobuf_remote *rnb, int *nr_local,
+ struct niobuf_local *lnb, char *jobid)
+{
+ struct dt_object *dob;
+ int i, j, k, rc = 0, tot_bytes = 0;
+
+ ENTRY;
+
+ /* Process incoming grant info, set OBD_BRW_GRANTED flag and grant some
+ * space back if possible */
+ mdt_grant_prepare_write(env, exp, oa, rnb, obj->ioo_bufcnt);
+
+ mdt_dom_read_lock(mo);
+ if (!mdt_object_exists(mo)) {
+ CDEBUG(D_ERROR, "%s: BRW to missing obj "DFID"\n",
+ exp->exp_obd->obd_name, PFID(mdt_object_fid(mo)));
+ GOTO(unlock, rc = -ENOENT);
+ }
+
+ dob = mdt_obj2dt(mo);
+ /* parse remote buffers to local buffers and prepare the latter */
+ *nr_local = 0;
+ for (i = 0, j = 0; i < obj->ioo_bufcnt; i++) {
+ rc = dt_bufs_get(env, dob, rnb + i, lnb + j, 1);
+ if (unlikely(rc < 0))
+ GOTO(err, rc);
+ /* correct index for local buffers to continue with */
+ for (k = 0; k < rc; k++)
+ lnb[j+k].lnb_flags = rnb[i].rnb_flags;
+ j += rc;
+ *nr_local += rc;
+ tot_bytes += rnb[i].rnb_len;
+ }
+
+ rc = dt_write_prep(env, dob, lnb, *nr_local);
+ if (likely(rc))
+ GOTO(err, rc);
+
+ mdt_io_counter_incr(exp, LPROC_MDT_IO_WRITE, jobid, tot_bytes);
+ RETURN(0);
+err:
+ dt_bufs_put(env, dob, lnb, *nr_local);
+unlock:
+ mdt_dom_read_unlock(mo);
+ /* tgt_grant_prepare_write() was called, so we must commit */
+ mdt_grant_commit(exp, oa->o_grant_used, rc);
+ /* let's still process incoming grant information packed in the oa,
+ * but without enforcing grant since we won't proceed with the write.
+ * Just like a read request actually. */
+ mdt_grant_prepare_read(env, exp, oa);
+ return rc;
+}
+
+int mdt_obd_preprw(const struct lu_env *env, int cmd, struct obd_export *exp,
+ struct obdo *oa, int objcount, struct obd_ioobj *obj,
+ struct niobuf_remote *rnb, int *nr_local,
+ struct niobuf_local *lnb)
+{
+ struct tgt_session_info *tsi = tgt_ses_info(env);
+ struct mdt_thread_info *info = tsi2mdt_info(tsi);
+ struct lu_attr *la = &info->mti_attr.ma_attr;
+ struct mdt_device *mdt = mdt_dev(exp->exp_obd->obd_lu_dev);
+ struct mdt_object *mo;
+ char *jobid;
+ int rc = 0;
+
+ /* The default value PTLRPC_MAX_BRW_PAGES is set in tgt_brw_write()
+ * but for MDT it is different, correct it here. */
+ if (*nr_local > MD_MAX_BRW_PAGES)
+ *nr_local = MD_MAX_BRW_PAGES;
+
+ jobid = tsi->tsi_jobid;
+
+ if (!oa || objcount != 1 || obj->ioo_bufcnt == 0) {
+ CERROR("%s: bad parameters %p/%i/%i\n",
+ exp->exp_obd->obd_name, oa, objcount, obj->ioo_bufcnt);
+ rc = -EPROTO;
+ }
+
+ mo = mdt_object_find(env, mdt, &tsi->tsi_fid);
+ if (IS_ERR(mo))
+ GOTO(out, rc = PTR_ERR(mo));
+
+ LASSERT(info->mti_object == NULL);
+ info->mti_object = mo;
+
+ if (cmd == OBD_BRW_WRITE) {
+ la_from_obdo(la, oa, OBD_MD_FLGETATTR);
+ rc = mdt_preprw_write(env, exp, mdt, mo, la, oa,
+ objcount, obj, rnb, nr_local, lnb,
+ jobid);
+ } else if (cmd == OBD_BRW_READ) {
+ mdt_grant_prepare_read(env, exp, oa);
+ rc = mdt_preprw_read(env, exp, mdt, mo, la,
+ obj->ioo_bufcnt, rnb, nr_local, lnb,
+ jobid);
+ obdo_from_la(oa, la, LA_ATIME);
+ } else {
+ CERROR("%s: wrong cmd %d received!\n",
+ exp->exp_obd->obd_name, cmd);
+ rc = -EPROTO;
+ }
+ if (rc) {
+ lu_object_put(env, &mo->mot_obj);
+ info->mti_object = NULL;
+ }
+out:
+ RETURN(rc);
+}
+
+static int mdt_commitrw_read(const struct lu_env *env, struct mdt_device *mdt,
+ struct mdt_object *mo, int objcount, int niocount,
+ struct niobuf_local *lnb)
+{
+ struct dt_object *dob;
+ int rc = 0;
+
+ ENTRY;
+
+ LASSERT(niocount > 0);
+
+ dob = mdt_obj2dt(mo);
+
+ dt_bufs_put(env, dob, lnb, niocount);
+
+ mdt_dom_read_unlock(mo);
+ RETURN(rc);
+}
+
+static int mdt_commitrw_write(const struct lu_env *env, struct obd_export *exp,
+ struct mdt_device *mdt, struct mdt_object *mo,
+ struct lu_attr *la, int objcount, int niocount,
+ struct niobuf_local *lnb, unsigned long granted,
+ int old_rc)
+{
+ struct dt_device *dt = mdt->mdt_bottom;
+ struct dt_object *dob;
+ struct thandle *th;
+ int rc = 0;
+ int retries = 0;
+ int i;
+
+ ENTRY;
+
+ dob = mdt_obj2dt(mo);
+
+ if (old_rc)
+ GOTO(out, rc = old_rc);
+
+ la->la_valid &= LA_ATIME | LA_MTIME | LA_CTIME;
+retry:
+ if (!dt_object_exists(dob))
+ GOTO(out, rc = -ENOENT);
+
+ th = dt_trans_create(env, dt);
+ if (IS_ERR(th))
+ GOTO(out, rc = PTR_ERR(th));
+
+ for (i = 0; i < niocount; i++) {
+ if (!(lnb[i].lnb_flags & OBD_BRW_ASYNC)) {
+ th->th_sync = 1;
+ break;
+ }
+ }
+
+ if (OBD_FAIL_CHECK(OBD_FAIL_OST_DQACQ_NET))
+ GOTO(out_stop, rc = -EINPROGRESS);
+
+ rc = dt_declare_write_commit(env, dob, lnb, niocount, th);
+ if (rc)
+ GOTO(out_stop, rc);
+
+ if (la->la_valid) {
+ /* update [mac]time if needed */
+ rc = dt_declare_attr_set(env, dob, la, th);
+ if (rc)
+ GOTO(out_stop, rc);
+ }
+
+ rc = dt_trans_start(env, dt, th);
+ if (rc)
+ GOTO(out_stop, rc);
+
+ dt_write_lock(env, dob, 0);
+ rc = dt_write_commit(env, dob, lnb, niocount, th);
+ if (rc)
+ GOTO(unlock, rc);
+
+ if (la->la_valid) {
+ rc = dt_attr_set(env, dob, la, th);
+ if (rc)
+ GOTO(unlock, rc);
+ }
+ /* get attr to return */
+ rc = dt_attr_get(env, dob, la);
+unlock:
+ dt_write_unlock(env, dob);
+
+out_stop:
+ /* Force commit to make the just-deleted blocks
+ * reusable. LU-456 */
+ if (rc == -ENOSPC)
+ th->th_sync = 1;
+
+ th->th_result = rc;
+ dt_trans_stop(env, dt, th);
+ if (rc == -ENOSPC && retries++ < 3) {
+ CDEBUG(D_INODE, "retry after force commit, retries:%d\n",
+ retries);
+ goto retry;
+ }
+
+out:
+ dt_bufs_put(env, dob, lnb, niocount);
+ mdt_dom_read_unlock(mo);
+ mdt_grant_commit(exp, granted, old_rc);
+ RETURN(rc);
+}
+
+int mdt_obd_commitrw(const struct lu_env *env, int cmd, struct obd_export *exp,
+ struct obdo *oa, int objcount, struct obd_ioobj *obj,
+ struct niobuf_remote *rnb, int npages,
+ struct niobuf_local *lnb, int old_rc)
+{
+ struct mdt_thread_info *info = mdt_th_info(env);
+ struct mdt_device *mdt = mdt_dev(exp->exp_obd->obd_lu_dev);
+ struct mdt_object *mo = info->mti_object;
+ struct lu_attr *la = &info->mti_attr.ma_attr;
+ __u64 valid;
+ int rc = 0;
+
+ if (npages == 0) {
+ CERROR("%s: no pages to commit\n",
+ exp->exp_obd->obd_name);
+ rc = -EPROTO;
+ }
+
+ LASSERT(mo);
+
+ if (cmd == OBD_BRW_WRITE) {
+ /* Don't update timestamps if this write is older than a
+ * setattr which modifies the timestamps. b=10150 */
+
+ /* XXX when we start having persistent reservations this needs
+ * to be changed to ofd_fmd_get() to create the fmd if it
+ * doesn't already exist so we can store the reservation handle
+ * there. */
+ valid = OBD_MD_FLUID | OBD_MD_FLGID;
+ valid |= OBD_MD_FLATIME | OBD_MD_FLMTIME | OBD_MD_FLCTIME;
+
+ la_from_obdo(la, oa, valid);
+
+ rc = mdt_commitrw_write(env, exp, mdt, mo, la, objcount,
+ npages, lnb, oa->o_grant_used, old_rc);
+ if (rc == 0)
+ obdo_from_la(oa, la, VALID_FLAGS | LA_GID | LA_UID);
+ else
+ obdo_from_la(oa, la, LA_GID | LA_UID);
+
+ /* don't report overquota flag if we failed before reaching
+ * commit */
+ if (old_rc == 0 && (rc == 0 || rc == -EDQUOT)) {
+ /* return the overquota flags to client */
+ if (lnb[0].lnb_flags & OBD_BRW_OVER_USRQUOTA) {
+ if (oa->o_valid & OBD_MD_FLFLAGS)
+ oa->o_flags |= OBD_FL_NO_USRQUOTA;
+ else
+ oa->o_flags = OBD_FL_NO_USRQUOTA;
+ }
+
+ if (lnb[0].lnb_flags & OBD_BRW_OVER_GRPQUOTA) {
+ if (oa->o_valid & OBD_MD_FLFLAGS)
+ oa->o_flags |= OBD_FL_NO_GRPQUOTA;
+ else
+ oa->o_flags = OBD_FL_NO_GRPQUOTA;
+ }
+
+ oa->o_valid |= OBD_MD_FLFLAGS | OBD_MD_FLUSRQUOTA |
+ OBD_MD_FLGRPQUOTA;
+ }
+ } else if (cmd == OBD_BRW_READ) {
+ rc = mdt_commitrw_read(env, mdt, mo, objcount, npages, lnb);
+ if (old_rc)
+ rc = old_rc;
+ } else {
+ rc = -EPROTO;
+ }
+ /* this put is pair to object_get in ofd_preprw_write */
+ mdt_thread_info_fini(info);
+ RETURN(rc);
+}
+
+int mdt_object_punch(const struct lu_env *env, struct dt_device *dt,
+ struct dt_object *dob, __u64 start, __u64 end,
+ struct lu_attr *la)
+{
+ struct thandle *th;
+ int rc;
+
+ ENTRY;
+
+ /* we support truncate, not punch yet */
+ LASSERT(end == OBD_OBJECT_EOF);
+
+ if (!dt_object_exists(dob))
+ RETURN(-ENOENT);
+
+ th = dt_trans_create(env, dt);
+ if (IS_ERR(th))
+ RETURN(PTR_ERR(th));
+
+ rc = dt_declare_attr_set(env, dob, la, th);
+ if (rc)
+ GOTO(stop, rc);
+
+ rc = dt_declare_punch(env, dob, start, OBD_OBJECT_EOF, th);
+ if (rc)
+ GOTO(stop, rc);
+
+ tgt_vbr_obj_set(env, dob);
+ rc = dt_trans_start(env, dt, th);
+ if (rc)
+ GOTO(stop, rc);
+
+ dt_write_lock(env, dob, 0);
+ rc = dt_punch(env, dob, start, OBD_OBJECT_EOF, th);
+ if (rc)
+ GOTO(unlock, rc);
+ rc = dt_attr_set(env, dob, la, th);
+ if (rc)
+ GOTO(unlock, rc);
+unlock:
+ dt_write_unlock(env, dob);
+stop:
+ th->th_result = rc;
+ dt_trans_stop(env, dt, th);
+ RETURN(rc);
+}
+
+int mdt_punch_hdl(struct tgt_session_info *tsi)
+{
+ const struct obdo *oa = &tsi->tsi_ost_body->oa;
+ struct ost_body *repbody;
+ struct mdt_thread_info *info;
+ struct lu_attr *la;
+ struct ldlm_namespace *ns = tsi->tsi_tgt->lut_obd->obd_namespace;
+ struct obd_export *exp = tsi->tsi_exp;
+ struct mdt_device *mdt = mdt_dev(exp->exp_obd->obd_lu_dev);
+ struct mdt_object *mo;
+ struct dt_object *dob;
+ __u64 flags = 0;
+ struct lustre_handle lh = { 0, };
+ __u64 start, end;
+ int rc;
+ bool srvlock;
+
+ ENTRY;
+
+ /* check that we do support OBD_CONNECT_TRUNCLOCK. */
+ CLASSERT(OST_CONNECT_SUPPORTED & OBD_CONNECT_TRUNCLOCK);
+
+ if ((oa->o_valid & (OBD_MD_FLSIZE | OBD_MD_FLBLOCKS)) !=
+ (OBD_MD_FLSIZE | OBD_MD_FLBLOCKS))
+ RETURN(err_serious(-EPROTO));
+
+ repbody = req_capsule_server_get(tsi->tsi_pill, &RMF_OST_BODY);
+ if (repbody == NULL)
+ RETURN(err_serious(-ENOMEM));
+
+ /* punch start,end are passed in o_size,o_blocks throught wire */
+ start = oa->o_size;
+ end = oa->o_blocks;
+
+ if (end != OBD_OBJECT_EOF) /* Only truncate is supported */
+ RETURN(-EPROTO);
+
+ info = tsi2mdt_info(tsi);
+ la = &info->mti_attr.ma_attr;
+ /* standard truncate optimization: if file body is completely
+ * destroyed, don't send data back to the server. */
+ if (start == 0)
+ flags |= LDLM_FL_AST_DISCARD_DATA;
+
+ repbody->oa.o_oi = oa->o_oi;
+ repbody->oa.o_valid = OBD_MD_FLID;
+
+ srvlock = (exp_connect_flags(exp) & OBD_CONNECT_SRVLOCK) &&
+ oa->o_valid & OBD_MD_FLFLAGS &&
+ oa->o_flags & OBD_FL_SRVLOCK;
+
+ if (srvlock) {
+ rc = tgt_mdt_data_lock(ns, &tsi->tsi_resid, &lh, LCK_PW,
+ &flags);
+ if (rc != 0)
+ GOTO(out, rc);
+ }
+
+ CDEBUG(D_INODE, "calling punch for object "DFID", valid = %#llx"
+ ", start = %lld, end = %lld\n", PFID(&tsi->tsi_fid),
+ oa->o_valid, start, end);
+
+ mo = mdt_object_find(tsi->tsi_env, mdt, &tsi->tsi_fid);
+ if (IS_ERR(mo))
+ GOTO(out_unlock, rc = PTR_ERR(mo));
+
+ mdt_dom_write_lock(mo);
+ if (!mdt_object_exists(mo))
+ GOTO(out_put, rc = -ENOENT);
+ dob = mdt_obj2dt(mo);
+
+ la_from_obdo(la, oa, OBD_MD_FLMTIME | OBD_MD_FLATIME | OBD_MD_FLCTIME);
+ la->la_size = start;
+ la->la_valid |= LA_SIZE;
+
+ rc = mdt_object_punch(tsi->tsi_env, mdt->mdt_bottom, dob,
+ start, end, la);
+ mdt_dom_write_unlock(mo);
+ if (rc)
+ GOTO(out_put, rc);
+
+ mdt_io_counter_incr(tsi->tsi_exp, LPROC_MDT_IO_PUNCH,
+ tsi->tsi_jobid, 1);
+ EXIT;
+out_put:
+ lu_object_put(tsi->tsi_env, &mo->mot_obj);
+out_unlock:
+ if (srvlock)
+ mdt_save_lock(info, &lh, LCK_PW, rc);
+out:
+ mdt_thread_info_fini(info);
+ if (rc == 0) {
+ struct ldlm_resource *res;
+
+ /* we do not call this before to avoid lu_object_find() in
+ * ->lvbo_update() holding another reference on the object.
+ * otherwise concurrent destroy can make the object unavailable
+ * for 2nd lu_object_find() waiting for the first reference
+ * to go... deadlock! */
+ res = ldlm_resource_get(ns, NULL, &tsi->tsi_resid,
+ LDLM_IBITS, 0);
+ if (!IS_ERR(res)) {
+ ldlm_res_lvbo_update(res, NULL, 0);
+ ldlm_resource_putref(res);
+ }
+ }
+ return rc;
+}
+
git://git.whamcloud.com / fs / lustre-release.git / commitdiff