/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*- * vim:expandtab:shiftwidth=8:tabstop=8: * * linux/mds/mds_reint.c * Lustre Metadata Server (mds) reintegration routines * * Copyright (C) 2002, 2003 Cluster File Systems, Inc. * Author: Peter Braam * Author: Andreas Dilger * Author: Phil Schwan * * This file is part of Lustre, http://www.lustre.org. * * Lustre is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. * * Lustre 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 for more details. * * You should have received a copy of the GNU General Public License * along with Lustre; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #ifndef EXPORT_SYMTAB # define EXPORT_SYMTAB #endif #define DEBUG_SUBSYSTEM S_MDS #include #include #include #include #include #include #include #include #include #include "mds_internal.h" void mds_commit_cb(struct obd_device *obd, __u64 transno, void *data, int error) { obd_transno_commit_cb(obd, transno, error); } struct mds_logcancel_data { struct lov_mds_md *mlcd_lmm; int mlcd_size; int mlcd_cookielen; int mlcd_eadatalen; struct llog_cookie mlcd_cookies[0]; }; static void mds_cancel_cookies_cb(struct obd_device *obd, __u64 transno, void *cb_data, int error) { struct mds_logcancel_data *mlcd = cb_data; struct lov_stripe_md *lsm = NULL; struct llog_ctxt *ctxt; int rc; obd_transno_commit_cb(obd, transno, error); CDEBUG(D_HA, "cancelling %d cookies\n", (int)(mlcd->mlcd_cookielen / sizeof(*mlcd->mlcd_cookies))); rc = obd_unpackmd(obd->u.mds.mds_osc_exp, &lsm, mlcd->mlcd_lmm, mlcd->mlcd_eadatalen); if (rc < 0) { CERROR("bad LSM cancelling %d log cookies: rc %d\n", (int)(mlcd->mlcd_cookielen/sizeof(*mlcd->mlcd_cookies)), rc); } else { ///* XXX 0 normally, SENDNOW for debug */); ctxt = llog_get_context(&obd->obd_llogs, mlcd->mlcd_cookies[0].lgc_subsys + 1); rc = llog_cancel(ctxt, lsm, mlcd->mlcd_cookielen / sizeof(*mlcd->mlcd_cookies), mlcd->mlcd_cookies, OBD_LLOG_FL_SENDNOW); if (rc) CERROR("error cancelling %d log cookies: rc %d\n", (int)(mlcd->mlcd_cookielen / sizeof(*mlcd->mlcd_cookies)), rc); } OBD_FREE(mlcd, mlcd->mlcd_size); } /* Assumes caller has already pushed us into the kernel context. */ int mds_finish_transno(struct mds_obd *mds, struct inode *inode, void *handle, struct ptlrpc_request *req, int rc, __u32 op_data) { struct mds_export_data *med = &req->rq_export->exp_mds_data; struct mds_client_data *mcd = med->med_mcd; struct obd_device *obd = req->rq_export->exp_obd; int err; __u64 transno; loff_t off; int log_pri = D_HA; ENTRY; /* if the export has already been failed, we have no last_rcvd slot */ if (req->rq_export->exp_failed) { CERROR("committing transaction for disconnected client\n"); if (handle) GOTO(commit, rc); RETURN(rc); } if (IS_ERR(handle)) RETURN(rc); if (handle == NULL) { /* if we're starting our own xaction, use our own inode */ inode = mds->mds_rcvd_filp->f_dentry->d_inode; handle = fsfilt_start(obd, inode, FSFILT_OP_SETATTR, NULL); if (IS_ERR(handle)) { CERROR("fsfilt_start: %ld\n", PTR_ERR(handle)); RETURN(PTR_ERR(handle)); } } off = med->med_off; transno = req->rq_reqmsg->transno; if (rc != 0) { LASSERT(transno == 0); } else if (transno == 0) { spin_lock(&mds->mds_transno_lock); transno = ++mds->mds_last_transno; spin_unlock(&mds->mds_transno_lock); } else { spin_lock(&mds->mds_transno_lock); if (transno > mds->mds_last_transno) mds->mds_last_transno = transno; spin_unlock(&mds->mds_transno_lock); } req->rq_repmsg->transno = req->rq_transno = transno; mcd->mcd_last_transno = cpu_to_le64(transno); mcd->mcd_last_xid = cpu_to_le64(req->rq_xid); mcd->mcd_last_result = cpu_to_le32(rc); mcd->mcd_last_data = cpu_to_le32(op_data); fsfilt_add_journal_cb(req->rq_export->exp_obd, transno, handle, mds_commit_cb, NULL); err = fsfilt_write_record(obd, mds->mds_rcvd_filp, mcd, sizeof(*mcd), &off, 0); if (err) { log_pri = D_ERROR; if (rc == 0) rc = err; } DEBUG_REQ(log_pri, req, "wrote trans #"LPU64" client %s at idx %u: err = %d", transno, mcd->mcd_uuid, med->med_idx, err); err = mds_lov_write_objids(obd); if (err) { log_pri = D_ERROR; if (rc == 0) rc = err; } CDEBUG(log_pri, "wrote objids: err = %d\n", err); commit: err = fsfilt_commit(obd, inode, handle, 0); if (err) { CERROR("error committing transaction: %d\n", err); if (!rc) rc = err; } RETURN(rc); } /* this gives the same functionality as the code between * sys_chmod and inode_setattr * chown_common and inode_setattr * utimes and inode_setattr */ int mds_fix_attr(struct inode *inode, struct mds_update_record *rec) { time_t now = LTIME_S(CURRENT_TIME); struct iattr *attr = &rec->ur_iattr; unsigned int ia_valid = attr->ia_valid; int error; ENTRY; /* only fix up attrs if the client VFS didn't already */ if (!(ia_valid & ATTR_RAW)) RETURN(0); if (!(ia_valid & ATTR_CTIME_SET)) LTIME_S(attr->ia_ctime) = now; if (!(ia_valid & ATTR_ATIME_SET)) LTIME_S(attr->ia_atime) = now; if (!(ia_valid & ATTR_MTIME_SET)) LTIME_S(attr->ia_mtime) = now; if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) RETURN(-EPERM); /* times */ if ((ia_valid & (ATTR_MTIME|ATTR_ATIME)) == (ATTR_MTIME|ATTR_ATIME)) { if (rec->ur_fsuid != inode->i_uid && (error = ll_permission(inode, MAY_WRITE, NULL)) != 0) RETURN(error); } if (ia_valid & ATTR_SIZE) { if ((error = ll_permission(inode, MAY_WRITE, NULL)) != 0) RETURN(error); } if (ia_valid & ATTR_UID) { /* chown */ error = -EPERM; if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) RETURN(-EPERM); if (attr->ia_uid == (uid_t) -1) attr->ia_uid = inode->i_uid; if (attr->ia_gid == (gid_t) -1) attr->ia_gid = inode->i_gid; attr->ia_mode = inode->i_mode; /* * If the user or group of a non-directory has been * changed by a non-root user, remove the setuid bit. * 19981026 David C Niemi * * Changed this to apply to all users, including root, * to avoid some races. This is the behavior we had in * 2.0. The check for non-root was definitely wrong * for 2.2 anyway, as it should have been using * CAP_FSETID rather than fsuid -- 19990830 SD. */ if ((inode->i_mode & S_ISUID) == S_ISUID && !S_ISDIR(inode->i_mode)) { attr->ia_mode &= ~S_ISUID; attr->ia_valid |= ATTR_MODE; } /* * Likewise, if the user or group of a non-directory * has been changed by a non-root user, remove the * setgid bit UNLESS there is no group execute bit * (this would be a file marked for mandatory * locking). 19981026 David C Niemi * * Removed the fsuid check (see the comment above) -- * 19990830 SD. */ if (((inode->i_mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) && !S_ISDIR(inode->i_mode)) { attr->ia_mode &= ~S_ISGID; attr->ia_valid |= ATTR_MODE; } } else if (ia_valid & ATTR_MODE) { int mode = attr->ia_mode; /* chmod */ if (attr->ia_mode == (mode_t) -1) attr->ia_mode = inode->i_mode; attr->ia_mode = (mode & S_IALLUGO) | (inode->i_mode & ~S_IALLUGO); } RETURN(0); } void mds_steal_ack_locks(struct ptlrpc_request *req) { struct obd_export *exp = req->rq_export; struct list_head *tmp; struct ptlrpc_reply_state *oldrep; struct ptlrpc_service *svc; unsigned long flags; int i; /* CAVEAT EMPTOR: spinlock order */ spin_lock_irqsave (&exp->exp_lock, flags); list_for_each (tmp, &exp->exp_outstanding_replies) { oldrep = list_entry(tmp, struct ptlrpc_reply_state,rs_exp_list); if (oldrep->rs_xid != req->rq_xid) continue; if (oldrep->rs_msg.opc != req->rq_reqmsg->opc) CERROR ("Resent req xid "LPX64" has mismatched opc: " "new %d old %d\n", req->rq_xid, req->rq_reqmsg->opc, oldrep->rs_msg.opc); svc = oldrep->rs_srv_ni->sni_service; spin_lock (&svc->srv_lock); list_del_init (&oldrep->rs_exp_list); CWARN("Stealing %d locks from rs %p x"LPD64".t"LPD64 " o%d NID"LPX64"\n", oldrep->rs_nlocks, oldrep, oldrep->rs_xid, oldrep->rs_transno, oldrep->rs_msg.opc, exp->exp_connection->c_peer.peer_nid); for (i = 0; i < oldrep->rs_nlocks; i++) ptlrpc_save_lock(req, &oldrep->rs_locks[i], oldrep->rs_modes[i]); oldrep->rs_nlocks = 0; DEBUG_REQ(D_HA, req, "stole locks for"); ptlrpc_schedule_difficult_reply (oldrep); spin_unlock (&svc->srv_lock); spin_unlock_irqrestore (&exp->exp_lock, flags); return; } spin_unlock_irqrestore (&exp->exp_lock, flags); } void mds_req_from_mcd(struct ptlrpc_request *req, struct mds_client_data *mcd) { DEBUG_REQ(D_HA, req, "restoring transno "LPD64"/status %d", mcd->mcd_last_transno, mcd->mcd_last_result); req->rq_repmsg->transno = req->rq_transno = mcd->mcd_last_transno; req->rq_repmsg->status = req->rq_status = mcd->mcd_last_result; mds_steal_ack_locks(req); } static void reconstruct_reint_setattr(struct mds_update_record *rec, int offset, struct ptlrpc_request *req) { struct mds_export_data *med = &req->rq_export->exp_mds_data; struct mds_obd *obd = &req->rq_export->exp_obd->u.mds; struct dentry *de; struct mds_body *body; mds_req_from_mcd(req, med->med_mcd); de = mds_fid2dentry(obd, rec->ur_fid1, NULL); if (IS_ERR(de)) { LASSERT(PTR_ERR(de) == req->rq_status); return; } body = lustre_msg_buf(req->rq_repmsg, 0, sizeof (*body)); mds_pack_inode2fid(req2obd(req), &body->fid1, de->d_inode); mds_pack_inode2body(req2obd(req), body, de->d_inode); /* Don't return OST-specific attributes if we didn't just set them */ if (rec->ur_iattr.ia_valid & ATTR_SIZE) body->valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS; if (rec->ur_iattr.ia_valid & (ATTR_MTIME | ATTR_MTIME_SET)) body->valid |= OBD_MD_FLMTIME; if (rec->ur_iattr.ia_valid & (ATTR_ATIME | ATTR_ATIME_SET)) body->valid |= OBD_MD_FLATIME; l_dput(de); } /* In the raw-setattr case, we lock the child inode. * In the write-back case or if being called from open, the client holds a lock * already. * * We use the ATTR_FROM_OPEN flag to tell these cases apart. */ static int mds_reint_setattr(struct mds_update_record *rec, int offset, struct ptlrpc_request *req, struct lustre_handle *lh) { struct mds_obd *mds = mds_req2mds(req); struct obd_device *obd = req->rq_export->exp_obd; struct mds_body *body; struct dentry *de; struct inode *inode = NULL; struct lustre_handle lockh[2]; void *handle = NULL; struct mds_logcancel_data *mlcd = NULL; int rc = 0, cleanup_phase = 0, err, locked = 0; ENTRY; LASSERT(offset == 0); DEBUG_REQ(D_INODE, req, "setattr "LPU64"/%u %x", rec->ur_fid1->id, rec->ur_fid1->generation, rec->ur_iattr.ia_valid); MDS_CHECK_RESENT(req, reconstruct_reint_setattr(rec, offset, req)); if (rec->ur_iattr.ia_valid & ATTR_FROM_OPEN) { de = mds_fid2dentry(mds, rec->ur_fid1, NULL); if (IS_ERR(de)) GOTO(cleanup, rc = PTR_ERR(de)); } else { __u64 lockpart = MDS_INODELOCK_UPDATE; if (rec->ur_iattr.ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID) ) lockpart |= MDS_INODELOCK_LOOKUP; de = mds_fid2locked_dentry(obd, rec->ur_fid1, NULL, LCK_PW, lockh, NULL, 0, lockpart); if (IS_ERR(de)) GOTO(cleanup, rc = PTR_ERR(de)); locked = 1; } cleanup_phase = 1; inode = de->d_inode; LASSERT(inode); if (S_ISREG(inode->i_mode) && rec->ur_eadata != NULL) down(&inode->i_sem); OBD_FAIL_WRITE(OBD_FAIL_MDS_REINT_SETATTR_WRITE, inode->i_sb); handle = fsfilt_start(obd, inode, FSFILT_OP_SETATTR, NULL); if (IS_ERR(handle)) GOTO(cleanup, rc = PTR_ERR(handle)); if (rec->ur_iattr.ia_valid & (ATTR_MTIME | ATTR_CTIME)) CDEBUG(D_INODE, "setting mtime %lu, ctime %lu\n", LTIME_S(rec->ur_iattr.ia_mtime), LTIME_S(rec->ur_iattr.ia_ctime)); rc = mds_fix_attr(inode, rec); if (rc) GOTO(cleanup, rc); if (rec->ur_iattr.ia_valid & ATTR_ATTR_FLAG) /* ioctl */ rc = fsfilt_iocontrol(obd, inode, NULL, EXT3_IOC_SETFLAGS, (long)&rec->ur_iattr.ia_attr_flags); else /* setattr */ rc = fsfilt_setattr(obd, de, handle, &rec->ur_iattr, 0); if (rc == 0 && S_ISREG(inode->i_mode) && rec->ur_eadata != NULL) { rc = fsfilt_set_md(obd, inode, handle, rec->ur_eadata, rec->ur_eadatalen); } body = lustre_msg_buf(req->rq_repmsg, 0, sizeof (*body)); mds_pack_inode2fid(obd, &body->fid1, inode); mds_pack_inode2body(obd, body, inode); /* Don't return OST-specific attributes if we didn't just set them */ if (rec->ur_iattr.ia_valid & ATTR_SIZE) body->valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS; if (rec->ur_iattr.ia_valid & (ATTR_MTIME | ATTR_MTIME_SET)) body->valid |= OBD_MD_FLMTIME; if (rec->ur_iattr.ia_valid & (ATTR_ATIME | ATTR_ATIME_SET)) body->valid |= OBD_MD_FLATIME; if (rc == 0 && rec->ur_cookielen && !IS_ERR(mds->mds_osc_obd)) { OBD_ALLOC(mlcd, sizeof(*mlcd) + rec->ur_cookielen + rec->ur_eadatalen); if (mlcd) { mlcd->mlcd_size = sizeof(*mlcd) + rec->ur_cookielen + rec->ur_eadatalen; mlcd->mlcd_eadatalen = rec->ur_eadatalen; mlcd->mlcd_cookielen = rec->ur_cookielen; mlcd->mlcd_lmm = (void *)&mlcd->mlcd_cookies + mlcd->mlcd_cookielen; memcpy(&mlcd->mlcd_cookies, rec->ur_logcookies, mlcd->mlcd_cookielen); memcpy(mlcd->mlcd_lmm, rec->ur_eadata, mlcd->mlcd_eadatalen); } else { CERROR("unable to allocate log cancel data\n"); } } EXIT; cleanup: if (mlcd != NULL) fsfilt_add_journal_cb(req->rq_export->exp_obd, 0, handle, mds_cancel_cookies_cb, mlcd); err = mds_finish_transno(mds, inode, handle, req, rc, 0); switch (cleanup_phase) { case 1: if (S_ISREG(inode->i_mode) && rec->ur_eadata != NULL) up(&inode->i_sem); l_dput(de); if (locked) { #ifdef S_PDIROPS if (lockh[1].cookie != 0) ldlm_lock_decref(lockh + 1, LCK_CW); #endif if (rc) { ldlm_lock_decref(lockh, LCK_PW); } else { ptlrpc_save_lock (req, lockh, LCK_PW); } } case 0: break; default: LBUG(); } if (err && !rc) rc = err; req->rq_status = rc; return 0; } static void reconstruct_reint_create(struct mds_update_record *rec, int offset, struct ptlrpc_request *req) { struct mds_export_data *med = &req->rq_export->exp_mds_data; struct mds_obd *obd = &req->rq_export->exp_obd->u.mds; struct dentry *parent, *child; struct mds_body *body; mds_req_from_mcd(req, med->med_mcd); if (req->rq_status) return; parent = mds_fid2dentry(obd, rec->ur_fid1, NULL); LASSERT(!IS_ERR(parent)); child = ll_lookup_one_len(rec->ur_name, parent, rec->ur_namelen - 1); LASSERT(!IS_ERR(child)); body = lustre_msg_buf(req->rq_repmsg, offset, sizeof (*body)); mds_pack_inode2fid(req2obd(req), &body->fid1, child->d_inode); mds_pack_inode2body(req2obd(req), body, child->d_inode); l_dput(parent); l_dput(child); } static int mds_reint_create(struct mds_update_record *rec, int offset, struct ptlrpc_request *req, struct lustre_handle *lh) { struct dentry *dparent = NULL; struct mds_obd *mds = mds_req2mds(req); struct obd_device *obd = req->rq_export->exp_obd; struct dentry *dchild = NULL; struct inode *dir = NULL; void *handle = NULL; struct lustre_handle lockh[2]; int rc = 0, err, type = rec->ur_mode & S_IFMT, cleanup_phase = 0; int created = 0; struct dentry_params dp; struct mea *mea = NULL; int mea_size; ENTRY; LASSERT(offset == 0); LASSERT(!strcmp(req->rq_export->exp_obd->obd_type->typ_name, "mds")); DEBUG_REQ(D_INODE, req, "parent "LPU64"/%u name %s mode %o", rec->ur_fid1->id, rec->ur_fid1->generation, rec->ur_name, rec->ur_mode); MDS_CHECK_RESENT(req, reconstruct_reint_create(rec, offset, req)); if (OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_CREATE)) GOTO(cleanup, rc = -ESTALE); dparent = mds_fid2locked_dentry(obd, rec->ur_fid1, NULL, LCK_PW, lockh, rec->ur_name, rec->ur_namelen - 1, MDS_INODELOCK_UPDATE); if (IS_ERR(dparent)) { rc = PTR_ERR(dparent); CERROR("parent lookup error %d\n", rc); GOTO(cleanup, rc); } cleanup_phase = 1; /* locked parent dentry */ dir = dparent->d_inode; LASSERT(dir); ldlm_lock_dump_handle(D_OTHER, lockh); /* try to retrieve MEA data for this dir */ rc = mds_get_lmv_attr(obd, dparent->d_inode, &mea, &mea_size); if (mea != NULL) { /* dir is already splitted, check is requested filename * should live at this MDS or at another one */ int i; i = mea_name2idx(mea, rec->ur_name, rec->ur_namelen - 1); if (mea->mea_master != i) { CERROR("inapropriate MDS(%d) for %s. should be %d\n", mea->mea_master, rec->ur_name, i); GOTO(cleanup, rc = -ERESTART); } } dchild = ll_lookup_one_len(rec->ur_name, dparent, rec->ur_namelen - 1); if (IS_ERR(dchild)) { rc = PTR_ERR(dchild); CERROR("child lookup error %d\n", rc); GOTO(cleanup, rc); } cleanup_phase = 2; /* child dentry */ OBD_FAIL_WRITE(OBD_FAIL_MDS_REINT_CREATE_WRITE, dir->i_sb); if (type == S_IFREG || type == S_IFDIR) { if ((rc = mds_try_to_split_dir(obd, dparent, &mea, 0))) { if (rc > 0) { /* dir got splitted */ GOTO(cleanup, rc = -ERESTART); } else { /* error happened during spitting */ GOTO(cleanup, rc); } } } if (dir->i_mode & S_ISGID) { if (S_ISDIR(rec->ur_mode)) rec->ur_mode |= S_ISGID; } dchild->d_fsdata = (void *)&dp; dp.p_inum = (unsigned long)rec->ur_fid2->id; dp.p_ptr = req; switch (type) { case S_IFREG:{ handle = fsfilt_start(obd, dir, FSFILT_OP_CREATE, NULL); if (IS_ERR(handle)) GOTO(cleanup, rc = PTR_ERR(handle)); rc = ll_vfs_create(dir, dchild, rec->ur_mode, NULL); EXIT; break; } case S_IFDIR:{ int nstripes = 0; int i; /* as Peter asked, mkdir() should distribute new directories * over the whole cluster in order to distribute namespace * processing load. first, we calculate which MDS to use to * put new directory's inode in */ i = mds_choose_mdsnum(obd, rec->ur_name, rec->ur_namelen - 1); if (i == mds->mds_num) { /* inode will be created locally */ handle = fsfilt_start(obd, dir, FSFILT_OP_MKDIR, NULL); if (IS_ERR(handle)) GOTO(cleanup, rc = PTR_ERR(handle)); rc = vfs_mkdir(dir, dchild, rec->ur_mode); if (rec->ur_eadata) nstripes = *(u16 *)rec->ur_eadata; if (rc == 0 && nstripes) { /* FIXME: error handling here */ mds_try_to_split_dir(obd, dchild, NULL, nstripes); } } else if (!DENTRY_VALID(dchild)) { /* inode will be created on another MDS */ struct obdo *oa = NULL; struct mds_body *body; /* first, create that inode */ oa = obdo_alloc(); LASSERT(oa != NULL); oa->o_mds = i; obdo_from_inode(oa, dir, OBD_MD_FLTYPE | OBD_MD_FLATIME | OBD_MD_FLMTIME | OBD_MD_FLCTIME | OBD_MD_FLUID | OBD_MD_FLGID); oa->o_mode = dir->i_mode; CDEBUG(D_OTHER, "%s: create dir on MDS %u\n", obd->obd_name, i); rc = obd_create(mds->mds_lmv_exp, oa, NULL, NULL); LASSERT(rc == 0); /* now, add new dir entry for it */ handle = fsfilt_start(obd, dir, FSFILT_OP_MKDIR, NULL); if (IS_ERR(handle)) GOTO(cleanup, rc = PTR_ERR(handle)); rc = fsfilt_add_dir_entry(obd, dparent, rec->ur_name, rec->ur_namelen - 1, oa->o_id, oa->o_generation, i); LASSERT(rc == 0); /* fill reply */ body = lustre_msg_buf(req->rq_repmsg, offset, sizeof (*body)); body->valid |= OBD_MD_FLID | OBD_MD_MDS; body->fid1.id = oa->o_id; body->fid1.mds = i; body->fid1.generation = oa->o_generation; obdo_free(oa); } else { /* requested name exists in the directory */ rc = -EEXIST; } EXIT; break; } case S_IFLNK:{ handle = fsfilt_start(obd, dir, FSFILT_OP_SYMLINK, NULL); if (IS_ERR(handle)) GOTO(cleanup, rc = PTR_ERR(handle)); if (rec->ur_tgt == NULL) /* no target supplied */ rc = -EINVAL; /* -EPROTO? */ else rc = vfs_symlink(dir, dchild, rec->ur_tgt); EXIT; break; } case S_IFCHR: case S_IFBLK: case S_IFIFO: case S_IFSOCK:{ int rdev = rec->ur_rdev; handle = fsfilt_start(obd, dir, FSFILT_OP_MKNOD, NULL); if (IS_ERR(handle)) GOTO(cleanup, (handle = NULL, rc = PTR_ERR(handle))); rc = vfs_mknod(dir, dchild, rec->ur_mode, rdev); EXIT; break; } default: CERROR("bad file type %o creating %s\n", type, rec->ur_name); dchild->d_fsdata = NULL; GOTO(cleanup, rc = -EINVAL); } /* In case we stored the desired inum in here, we want to clean up. */ if (dchild->d_fsdata == (void *)(unsigned long)rec->ur_fid2->id) dchild->d_fsdata = NULL; if (rc) { CDEBUG(D_INODE, "error during create: %d\n", rc); GOTO(cleanup, rc); } else if (dchild->d_inode) { struct iattr iattr; struct inode *inode = dchild->d_inode; struct mds_body *body; created = 1; LTIME_S(iattr.ia_atime) = rec->ur_time; LTIME_S(iattr.ia_ctime) = rec->ur_time; LTIME_S(iattr.ia_mtime) = rec->ur_time; iattr.ia_uid = rec->ur_fsuid; if (dir->i_mode & S_ISGID) iattr.ia_gid = dir->i_gid; else iattr.ia_gid = rec->ur_fsgid; iattr.ia_valid = ATTR_UID | ATTR_GID | ATTR_ATIME | ATTR_MTIME | ATTR_CTIME; if (rec->ur_fid2->id) { LASSERT(rec->ur_fid2->id == inode->i_ino); inode->i_generation = rec->ur_fid2->generation; /* Dirtied and committed by the upcoming setattr. */ CDEBUG(D_INODE, "recreated ino %lu with gen %u\n", inode->i_ino, inode->i_generation); } else { struct lustre_handle child_ino_lockh; CDEBUG(D_INODE, "created ino %lu with gen %x\n", inode->i_ino, inode->i_generation); /* The inode we were allocated may have just been freed * by an unlink operation. We take this lock to * synchronize against the matching reply-ack-lock taken * in unlink, to avoid replay problems if this reply * makes it out to the client but the unlink's does not. * See bug 2029 for more detail.*/ rc = mds_lock_new_child(obd, inode, &child_ino_lockh); if (rc != ELDLM_OK) { CERROR("error locking for unlink/create sync: " "%d\n", rc); } else { ldlm_lock_decref(&child_ino_lockh, LCK_EX); } } rc = fsfilt_setattr(obd, dchild, handle, &iattr, 0); if (rc) CERROR("error on child setattr: rc = %d\n", rc); iattr.ia_valid = ATTR_MTIME | ATTR_CTIME; rc = fsfilt_setattr(obd, dparent, handle, &iattr, 0); if (rc) CERROR("error on parent setattr: rc = %d\n", rc); body = lustre_msg_buf(req->rq_repmsg, offset, sizeof (*body)); mds_pack_inode2fid(obd, &body->fid1, inode); mds_pack_inode2body(obd, body, inode); } EXIT; cleanup: err = mds_finish_transno(mds, dir, handle, req, rc, 0); if (rc && created) { /* Destroy the file we just created. This should not need * extra journal credits, as we have already modified all of * the blocks needed in order to create the file in the first * place. */ switch (type) { case S_IFDIR: err = vfs_rmdir(dir, dchild); if (err) CERROR("rmdir in error path: %d\n", err); break; default: err = vfs_unlink(dir, dchild); if (err) CERROR("unlink in error path: %d\n", err); break; } } else { rc = err; } switch (cleanup_phase) { case 2: /* child dentry */ l_dput(dchild); case 1: /* locked parent dentry */ #ifdef S_PDIROPS if (lockh[1].cookie != 0) ldlm_lock_decref(lockh + 1, LCK_CW); #endif if (rc) { ldlm_lock_decref(lockh, LCK_PW); } else { ptlrpc_save_lock (req, lockh, LCK_PW); } l_dput(dparent); case 0: break; default: CERROR("invalid cleanup_phase %d\n", cleanup_phase); LBUG(); } if (mea) OBD_FREE(mea, mea_size); req->rq_status = rc; return 0; } static int res_gt(struct ldlm_res_id *res1, struct ldlm_res_id *res2, ldlm_policy_data_t *p1, ldlm_policy_data_t *p2) { int i; for (i = 0; i < RES_NAME_SIZE; i++) { /* return 1 here, because enqueue_ordered will skip resources * of all zeroes if they're sorted to the end of the list. */ if (res1->name[i] == 0 && res2->name[i] != 0) return 1; if (res2->name[i] == 0 && res1->name[i] != 0) return 0; if (res1->name[i] > res2->name[i]) return 1; if (res1->name[i] < res2->name[i]) return 0; } if (!p1 || !p2) return 0; if (memcmp(p1, p2, sizeof(*p1)) < 0) return 1; return 0; } /* This function doesn't use ldlm_match_or_enqueue because we're always called * with EX or PW locks, and the MDS is no longer allowed to match write locks, * because they take the place of local semaphores. * * One or two locks are taken in numerical order. A res_id->name[0] of 0 means * no lock is taken for that res_id. Must be at least one non-zero res_id. */ int enqueue_ordered_locks(struct obd_device *obd, struct ldlm_res_id *p1_res_id, struct lustre_handle *p1_lockh, int p1_lock_mode, ldlm_policy_data_t *p1_policy, struct ldlm_res_id *p2_res_id, struct lustre_handle *p2_lockh, int p2_lock_mode, ldlm_policy_data_t *p2_policy) { struct ldlm_res_id *res_id[2] = { p1_res_id, p2_res_id }; struct lustre_handle *handles[2] = { p1_lockh, p2_lockh }; int lock_modes[2] = { p1_lock_mode, p2_lock_mode }; ldlm_policy_data_t *policies[2] = { p1_policy, p2_policy }; int rc, flags; ENTRY; LASSERT(p1_res_id != NULL && p2_res_id != NULL); CDEBUG(D_INFO, "locks before: "LPU64"/"LPU64"\n", res_id[0]->name[0], res_id[1]->name[0]); if (res_gt(p1_res_id, p2_res_id, p1_policy, p2_policy)) { handles[1] = p1_lockh; handles[0] = p2_lockh; res_id[1] = p1_res_id; res_id[0] = p2_res_id; lock_modes[1] = p1_lock_mode; lock_modes[0] = p2_lock_mode; policies[1] = p1_policy; policies[0] = p2_policy; } CDEBUG(D_DLMTRACE, "lock order: "LPU64"/"LPU64"\n", res_id[0]->name[0], res_id[1]->name[0]); flags = LDLM_FL_LOCAL_ONLY; rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace, *res_id[0], LDLM_IBITS, policies[0], lock_modes[0], &flags, mds_blocking_ast, ldlm_completion_ast, NULL, NULL, NULL, 0, NULL, handles[0]); if (rc != ELDLM_OK) RETURN(-EIO); ldlm_lock_dump_handle(D_OTHER, handles[0]); if (!memcmp(res_id[0], res_id[1], sizeof(*res_id[0])) && (policies[0]->l_inodebits.bits & policies[1]->l_inodebits.bits)) { memcpy(handles[1], handles[0], sizeof(*(handles[1]))); ldlm_lock_addref(handles[1], lock_modes[1]); } else if (res_id[1]->name[0] != 0) { flags = LDLM_FL_LOCAL_ONLY; rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace, *res_id[1], LDLM_IBITS, policies[1], lock_modes[1], &flags, mds_blocking_ast, ldlm_completion_ast, NULL, NULL, NULL, 0, NULL, handles[1]); if (rc != ELDLM_OK) { ldlm_lock_decref(handles[0], lock_modes[0]); RETURN(-EIO); } ldlm_lock_dump_handle(D_OTHER, handles[1]); } RETURN(0); } int enqueue_4ordered_locks(struct obd_device *obd,struct ldlm_res_id *p1_res_id, struct lustre_handle *p1_lockh, int p1_lock_mode, ldlm_policy_data_t *p1_policy, struct ldlm_res_id *p2_res_id, struct lustre_handle *p2_lockh, int p2_lock_mode, ldlm_policy_data_t *p2_policy, struct ldlm_res_id *c1_res_id, struct lustre_handle *c1_lockh, int c1_lock_mode, ldlm_policy_data_t *c1_policy, struct ldlm_res_id *c2_res_id, struct lustre_handle *c2_lockh, int c2_lock_mode, ldlm_policy_data_t *c2_policy) { struct ldlm_res_id *res_id[5] = { p1_res_id, p2_res_id, c1_res_id, c2_res_id }; struct lustre_handle *dlm_handles[5] = { p1_lockh, p2_lockh, c1_lockh, c2_lockh }; int lock_modes[5] = { p1_lock_mode, p2_lock_mode, c1_lock_mode, c2_lock_mode }; ldlm_policy_data_t *policies[5] = { p1_policy, p2_policy, c1_policy, c2_policy}; int rc, i, j, sorted, flags; ENTRY; CDEBUG(D_DLMTRACE, "locks before: "LPU64"/"LPU64"/"LPU64"/"LPU64"\n", res_id[0]->name[0], res_id[1]->name[0], res_id[2]->name[0], res_id[3]->name[0]); /* simple insertion sort - we have at most 4 elements */ for (i = 1; i < 4; i++) { j = i - 1; dlm_handles[4] = dlm_handles[i]; res_id[4] = res_id[i]; lock_modes[4] = lock_modes[i]; policies[4] = policies[i]; sorted = 0; do { if (res_gt(res_id[j], res_id[4], policies[j], policies[4])) { dlm_handles[j + 1] = dlm_handles[j]; res_id[j + 1] = res_id[j]; lock_modes[j + 1] = lock_modes[j]; policies[j + 1] = policies[j]; j--; } else { sorted = 1; } } while (j >= 0 && !sorted); dlm_handles[j + 1] = dlm_handles[4]; res_id[j + 1] = res_id[4]; lock_modes[j + 1] = lock_modes[4]; policies[j + 1] = policies[4]; } CDEBUG(D_DLMTRACE, "lock order: "LPU64"/"LPU64"/"LPU64"/"LPU64"\n", res_id[0]->name[0], res_id[1]->name[0], res_id[2]->name[0], res_id[3]->name[0]); /* XXX we could send ASTs on all these locks first before blocking? */ for (i = 0; i < 4; i++) { flags = 0; if (res_id[i]->name[0] == 0) break; if (i != 0 && !memcmp(res_id[i], res_id[i-1], sizeof(*res_id[i])) && (policies[i]->l_inodebits.bits & policies[i-1]->l_inodebits.bits) ) { memcpy(dlm_handles[i], dlm_handles[i-1], sizeof(*(dlm_handles[i]))); ldlm_lock_addref(dlm_handles[i], lock_modes[i]); } else { rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace, *res_id[i], LDLM_IBITS, policies[i], lock_modes[i], &flags, mds_blocking_ast, ldlm_completion_ast, NULL, NULL, NULL, 0, NULL, dlm_handles[i]); if (rc != ELDLM_OK) GOTO(out_err, rc = -EIO); ldlm_lock_dump_handle(D_OTHER, dlm_handles[i]); } } RETURN(0); out_err: while (i-- > 0) ldlm_lock_decref(dlm_handles[i], lock_modes[i]); return rc; } /* In the unlikely case that the child changed while we were waiting * on the lock, we need to drop the lock on the old child and either: * - if the child has a lower resource name, then we have to also * drop the parent lock and regain the locks in the right order * - in the rename case, if the child has a lower resource name than one of * the other parent/child resources (maxres) we also need to reget the locks * - if the child has a higher resource name (this is the common case) * we can just get the lock on the new child (still in lock order) * * Returns 0 if the child did not change or if it changed but could be locked. * Returns 1 if the child changed and we need to re-lock (no locks held). * Returns -ve error with a valid dchild (no locks held). */ static int mds_verify_child(struct obd_device *obd, struct ldlm_res_id *parent_res_id, struct lustre_handle *parent_lockh, struct dentry *dparent, int parent_mode, struct ldlm_res_id *child_res_id, struct lustre_handle *child_lockh, struct dentry **dchildp, int child_mode, ldlm_policy_data_t *child_policy, const char *name, int namelen, struct ldlm_res_id *maxres) { struct dentry *vchild, *dchild = *dchildp; int rc = 0, cleanup_phase = 2; /* parent, child locks */ ENTRY; vchild = ll_lookup_one_len(name, dparent, namelen - 1); if (IS_ERR(vchild)) GOTO(cleanup, rc = PTR_ERR(vchild)); if ((vchild->d_flags & DCACHE_CROSS_REF)) { if (child_res_id->name[0] == vchild->d_inum && child_res_id->name[1] == vchild->d_generation) { if (dchild != NULL) l_dput(dchild); *dchildp = vchild; RETURN(0); } goto changed; } if (likely((vchild->d_inode == NULL && child_res_id->name[0] == 0) || (vchild->d_inode != NULL && child_res_id->name[0] == vchild->d_inode->i_ino && child_res_id->name[1] == vchild->d_inode->i_generation))) { if (dchild != NULL) l_dput(dchild); *dchildp = vchild; RETURN(0); } changed: CDEBUG(D_DLMTRACE, "child inode changed: %p != %p (%lu != "LPU64")\n", vchild->d_inode, dchild ? dchild->d_inode : 0, vchild->d_inode ? vchild->d_inode->i_ino : 0, child_res_id->name[0]); if (child_res_id->name[0] != 0) ldlm_lock_decref(child_lockh, child_mode); if (dchild) l_dput(dchild); cleanup_phase = 1; /* parent lock only */ *dchildp = dchild = vchild; if (dchild->d_inode || (dchild->d_flags & DCACHE_CROSS_REF)) { int flags = 0; if (dchild->d_inode) { child_res_id->name[0] = dchild->d_inode->i_ino; child_res_id->name[1] = dchild->d_inode->i_generation; } else { child_res_id->name[0] = dchild->d_inum; child_res_id->name[1] = dchild->d_generation; } if (res_gt(parent_res_id, child_res_id, NULL, NULL) || res_gt(maxres, child_res_id, NULL, NULL)) { CDEBUG(D_DLMTRACE, "relock "LPU64"<("LPU64"|"LPU64")\n", child_res_id->name[0], parent_res_id->name[0], maxres->name[0]); GOTO(cleanup, rc = 1); } rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace, *child_res_id, LDLM_IBITS, child_policy, child_mode, &flags, mds_blocking_ast, ldlm_completion_ast, NULL, NULL, NULL, 0, NULL, child_lockh); if (rc != ELDLM_OK) GOTO(cleanup, rc = -EIO); } else { memset(child_res_id, 0, sizeof(*child_res_id)); } EXIT; cleanup: if (rc) { switch(cleanup_phase) { case 2: if (child_res_id->name[0] != 0) ldlm_lock_decref(child_lockh, child_mode); case 1: ldlm_lock_decref(parent_lockh, parent_mode); } } return rc; } int mds_get_parent_child_locked(struct obd_device *obd, struct mds_obd *mds, struct ll_fid *fid, struct lustre_handle *parent_lockh, struct dentry **dparentp, int parent_mode, __u64 parent_lockpart, char *name, int namelen, struct lustre_handle *child_lockh, struct dentry **dchildp, int child_mode, __u64 child_lockpart) { struct ldlm_res_id child_res_id = { .name = {0} }; struct ldlm_res_id parent_res_id = { .name = {0} }; ldlm_policy_data_t parent_policy = {.l_inodebits = { parent_lockpart }}; ldlm_policy_data_t child_policy = {.l_inodebits = { child_lockpart }}; struct inode *inode; int rc = 0, cleanup_phase = 0; ENTRY; /* Step 1: Lookup parent */ *dparentp = mds_fid2dentry(mds, fid, NULL); if (IS_ERR(*dparentp)) RETURN(rc = PTR_ERR(*dparentp)); LASSERT((*dparentp)->d_inode); CDEBUG(D_INODE, "parent ino %lu, name %s\n", (*dparentp)->d_inode->i_ino, name); parent_res_id.name[0] = (*dparentp)->d_inode->i_ino; parent_res_id.name[1] = (*dparentp)->d_inode->i_generation; #ifdef S_PDIROPS parent_lockh[1].cookie = 0; if (name && IS_PDIROPS((*dparentp)->d_inode)) { /* lock just dir { ino, generation } to flush client cache */ if (parent_mode == LCK_PW) { struct ldlm_res_id res_id = { .name = {0} }; ldlm_policy_data_t policy; int flags = 0; res_id.name[0] = (*dparentp)->d_inode->i_ino; res_id.name[1] = (*dparentp)->d_inode->i_generation; policy.l_inodebits.bits = MDS_INODELOCK_UPDATE; rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace, res_id, LDLM_IBITS, &policy, LCK_CW, &flags, mds_blocking_ast, ldlm_completion_ast, NULL, NULL, NULL, 0, NULL, parent_lockh+1); if (rc != ELDLM_OK) RETURN(-ENOLCK); } parent_res_id.name[2] = full_name_hash(name, namelen - 1); CDEBUG(D_INFO, "take lock on %lu:%u:"LPX64"\n", (*dparentp)->d_inode->i_ino, (*dparentp)->d_inode->i_generation, parent_res_id.name[2]); } #endif cleanup_phase = 1; /* parent dentry */ /* Step 2: Lookup child (without DLM lock, to get resource name) */ *dchildp = ll_lookup_one_len(name, *dparentp, namelen - 1); if (IS_ERR(*dchildp)) { rc = PTR_ERR(*dchildp); CDEBUG(D_INODE, "child lookup error %d\n", rc); GOTO(cleanup, rc); } if ((*dchildp)->d_flags & DCACHE_CROSS_REF) { /* inode lives on another MDS: return * mds/ino/gen * and LOOKUP lock. drop possible UPDATE lock! */ child_policy.l_inodebits.bits &= ~MDS_INODELOCK_UPDATE; child_res_id.name[0] = (*dchildp)->d_inum; child_res_id.name[1] = (*dchildp)->d_generation; goto retry_locks; } inode = (*dchildp)->d_inode; if (inode != NULL) inode = igrab(inode); if (inode == NULL) goto retry_locks; child_res_id.name[0] = inode->i_ino; child_res_id.name[1] = inode->i_generation; iput(inode); retry_locks: cleanup_phase = 2; /* child dentry */ /* Step 3: Lock parent and child in resource order. If child doesn't * exist, we still have to lock the parent and re-lookup. */ rc = enqueue_ordered_locks(obd,&parent_res_id,parent_lockh,parent_mode, &parent_policy, &child_res_id, child_lockh, child_mode, &child_policy); if (rc) GOTO(cleanup, rc); if ((*dchildp)->d_inode || ((*dchildp)->d_flags & DCACHE_CROSS_REF)) cleanup_phase = 4; /* child lock */ else cleanup_phase = 3; /* parent lock */ /* Step 4: Re-lookup child to verify it hasn't changed since locking */ rc = mds_verify_child(obd, &parent_res_id, parent_lockh, *dparentp, parent_mode, &child_res_id, child_lockh, dchildp, child_mode, &child_policy, name, namelen, &parent_res_id); if (rc > 0) goto retry_locks; if (rc < 0) { cleanup_phase = 3; GOTO(cleanup, rc); } cleanup: if (rc) { switch (cleanup_phase) { case 4: ldlm_lock_decref(child_lockh, child_mode); case 3: ldlm_lock_decref(parent_lockh, parent_mode); case 2: l_dput(*dchildp); case 1: #ifdef S_PDIROPS if (parent_lockh[1].cookie) ldlm_lock_decref(parent_lockh + 1, LCK_CW); #endif l_dput(*dparentp); default: ; } } return rc; } void mds_reconstruct_generic(struct ptlrpc_request *req) { struct mds_export_data *med = &req->rq_export->exp_mds_data; mds_req_from_mcd(req, med->med_mcd); } int mds_create_local_dentry(struct mds_update_record *rec, struct obd_device *obd) { struct mds_obd *mds = &obd->u.mds; struct inode *fids_dir = mds->mds_fids_dir->d_inode; int fidlen = 0, rc, cleanup_phase = 0; struct dentry *new_child = NULL; char *fidname = rec->ur_name; struct dentry *child = NULL; struct lustre_handle lockh; void *handle; ENTRY; down(&fids_dir->i_sem); fidlen = ll_fid2str(fidname, rec->ur_fid1->id, rec->ur_fid1->generation); CDEBUG(D_OTHER, "look for local dentry '%s' for %u/%u\n", fidname, (unsigned) rec->ur_fid1->id, (unsigned) rec->ur_fid1->generation); new_child = lookup_one_len(fidname, mds->mds_fids_dir, fidlen); up(&fids_dir->i_sem); if (IS_ERR(new_child)) { CERROR("can't lookup %s: %d\n", fidname, (int) PTR_ERR(new_child)); GOTO(cleanup, rc = PTR_ERR(new_child)); } cleanup_phase = 1; if (new_child->d_inode != NULL) { /* nice. we've already have local dentry! */ CDEBUG(D_OTHER, "found dentry in FIDS/: %u/%u\n", (unsigned) new_child->d_inode->i_ino, (unsigned) new_child->d_inode->i_generation); rec->ur_fid1->id = fids_dir->i_ino; rec->ur_fid1->generation = fids_dir->i_generation; rec->ur_namelen = fidlen + 1; GOTO(cleanup, rc = 0); } /* new, local dentry will be added soon. we need no aliases here */ d_drop(new_child); child = mds_fid2locked_dentry(obd, rec->ur_fid1, NULL, LCK_EX, &lockh, NULL, 0, MDS_INODELOCK_UPDATE); if (IS_ERR(child)) { CERROR("can't get victim\n"); GOTO(cleanup, rc = PTR_ERR(child)); } cleanup_phase = 2; handle = fsfilt_start(obd, fids_dir, FSFILT_OP_LINK, NULL); if (IS_ERR(handle)) GOTO(cleanup, rc = PTR_ERR(handle)); rc = fsfilt_add_dir_entry(obd, mds->mds_fids_dir, fidname, fidlen, rec->ur_fid1->id, rec->ur_fid1->generation, mds->mds_num); if (rc) CERROR("error linking orphan %lu/%lu to FIDS: rc = %d\n", (unsigned long) child->d_inode->i_ino, (unsigned long) child->d_inode->i_generation, rc); else { if (S_ISDIR(child->d_inode->i_mode)) { fids_dir->i_nlink++; mark_inode_dirty(fids_dir); } mark_inode_dirty(child->d_inode); } fsfilt_commit(obd, fids_dir, handle, 0); rec->ur_fid1->id = fids_dir->i_ino; rec->ur_fid1->generation = fids_dir->i_generation; rec->ur_namelen = fidlen + 1; cleanup: switch(cleanup_phase) { case 2: ldlm_lock_decref(&lockh, LCK_EX); dput(child); case 1: dput(new_child); case 0: break; } RETURN(rc); } static int mds_copy_unlink_reply(struct ptlrpc_request *master, struct ptlrpc_request *slave) { void *cookie, *cookie2; struct mds_body *body2; struct mds_body *body; void *ea, *ea2; ENTRY; body = lustre_msg_buf(slave->rq_repmsg, 0, sizeof(*body)); LASSERT(body != NULL); body2 = lustre_msg_buf(master->rq_repmsg, 0, sizeof (*body)); LASSERT(body2 != NULL); if (!(body->valid & (OBD_MD_FLID | OBD_MD_FLGENER))) { RETURN(0); } memcpy(body2, body, sizeof(*body)); body2->valid &= ~OBD_MD_FLCOOKIE; if (!(body->valid & OBD_MD_FLEASIZE)) RETURN(0); if (body->eadatasize == 0) { CERROR("OBD_MD_FLEASIZE set but eadatasize zero\n"); RETURN(0); } LASSERT(master->rq_repmsg->buflens[1] >= body->eadatasize); ea = lustre_msg_buf(slave->rq_repmsg, 1, body->eadatasize); LASSERT(ea != NULL); ea2 = lustre_msg_buf(master->rq_repmsg, 1, body->eadatasize); LASSERT(ea2 != NULL); memcpy(ea2, ea, body->eadatasize); if (body->valid & OBD_MD_FLCOOKIE) { LASSERT(master->rq_repmsg->buflens[2] >= slave->rq_repmsg->buflens[2]); cookie = lustre_msg_buf(slave->rq_repmsg, 2, slave->rq_repmsg->buflens[2]); LASSERT(cookie != NULL); cookie2 = lustre_msg_buf(master->rq_repmsg, 2, master->rq_repmsg->buflens[2]); LASSERT(cookie2 != NULL); memcpy(cookie2, cookie, slave->rq_repmsg->buflens[2]); body2->valid |= OBD_MD_FLCOOKIE; } RETURN(0); } static int mds_reint_unlink_remote(struct mds_update_record *rec, int offset, struct ptlrpc_request *req, struct lustre_handle *parent_lockh, struct dentry *dparent, struct lustre_handle *child_lockh, struct dentry *dchild) { struct mds_obd *mds = mds_req2mds(req); struct mdc_op_data op_data; int rc = 0, cleanup_phase = 0; struct ptlrpc_request *request = NULL; ENTRY; LASSERT(offset == 0 || offset == 2); DEBUG_REQ(D_INODE, req, "unlink %*s (remote inode %u/%u/%u)\n", rec->ur_namelen - 1, rec->ur_name, (unsigned)dchild->d_mdsnum, (unsigned) dchild->d_inum, (unsigned) dchild->d_generation); /* time to drop i_nlink on remote MDS */ op_data.fid1.mds = dchild->d_mdsnum; op_data.fid1.id = dchild->d_inum; op_data.fid1.generation = dchild->d_generation; op_data.create_mode = rec->ur_mode; op_data.namelen = 0; op_data.name = NULL; rc = md_unlink(mds->mds_lmv_exp, &op_data, &request); cleanup_phase = 2; if (request) { mds_copy_unlink_reply(req, request); ptlrpc_req_finished(request); } if (rc == 0) rc = fsfilt_del_dir_entry(req->rq_export->exp_obd, dchild); req->rq_status = rc; #ifdef S_PDIROPS if (parent_lockh[1].cookie != 0) ldlm_lock_decref(parent_lockh + 1, LCK_CW); #endif ldlm_lock_decref(child_lockh, LCK_EX); if (rc) ldlm_lock_decref(parent_lockh, LCK_PW); else ptlrpc_save_lock(req, parent_lockh, LCK_PW); l_dput(dchild); l_dput(dparent); return 0; } static int mds_reint_unlink(struct mds_update_record *rec, int offset, struct ptlrpc_request *req, struct lustre_handle *lh) { struct dentry *dparent, *dchild; struct mds_obd *mds = mds_req2mds(req); struct obd_device *obd = req->rq_export->exp_obd; struct mds_body *body = NULL; struct inode *child_inode; struct lustre_handle parent_lockh[2], child_lockh, child_reuse_lockh; char fidname[LL_FID_NAMELEN]; void *handle = NULL; int rc = 0, log_unlink = 0, cleanup_phase = 0; int unlink_by_fid = 0; ENTRY; LASSERT(offset == 0 || offset == 2); DEBUG_REQ(D_INODE, req, "parent ino "LPU64"/%u, child %s", rec->ur_fid1->id, rec->ur_fid1->generation, rec->ur_name); MDS_CHECK_RESENT(req, mds_reconstruct_generic(req)); if (OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_UNLINK)) GOTO(cleanup, rc = -ENOENT); if (rec->ur_namelen == 1) { /* this is request to drop i_nlink on local inode */ unlink_by_fid = 1; rec->ur_name = fidname; rc = mds_create_local_dentry(rec, obd); LASSERT(rc == 0); } rc = mds_get_parent_child_locked(obd, mds, rec->ur_fid1, parent_lockh, &dparent, LCK_PW, MDS_INODELOCK_UPDATE, rec->ur_name, rec->ur_namelen, &child_lockh, &dchild, LCK_EX, MDS_INODELOCK_LOOKUP|MDS_INODELOCK_UPDATE); if (rc) GOTO(cleanup, rc); if (dchild->d_flags & DCACHE_CROSS_REF) { /* we should have parent lock only here */ LASSERT(unlink_by_fid == 0); LASSERT(dchild->d_mdsnum != mds->mds_num); mds_reint_unlink_remote(rec, offset, req, parent_lockh, dparent, &child_lockh, dchild); RETURN(0); } cleanup_phase = 1; /* dchild, dparent, locks */ dget(dchild); child_inode = dchild->d_inode; if (child_inode == NULL) { CDEBUG(D_INODE, "child doesn't exist (dir %lu, name %s)\n", dparent ? dparent->d_inode->i_ino : 0, rec->ur_name); GOTO(cleanup, rc = -ENOENT); } cleanup_phase = 2; /* dchild has a lock */ /* Step 4: Get a lock on the ino to sync with creation WRT inode * reuse (see bug 2029). */ rc = mds_lock_new_child(obd, child_inode, &child_reuse_lockh); if (rc != ELDLM_OK) GOTO(cleanup, rc); cleanup_phase = 3; /* child inum lock */ OBD_FAIL_WRITE(OBD_FAIL_MDS_REINT_UNLINK_WRITE, dparent->d_inode->i_sb); /* ldlm_reply in buf[0] if called via intent */ if (offset) offset = 1; body = lustre_msg_buf(req->rq_repmsg, offset, sizeof (*body)); LASSERT(body != NULL); /* If this is the last reference to this inode, get the OBD EA * data first so the client can destroy OST objects. * we only do the object removal if no open files remain. * Nobody can get at this name anymore because of the locks so * we make decisions here as to whether to remove the inode */ if (S_ISREG(child_inode->i_mode) && child_inode->i_nlink == 1 && mds_open_orphan_count(child_inode) == 0) { mds_pack_inode2fid(obd, &body->fid1, child_inode); mds_pack_inode2body(obd, body, child_inode); mds_pack_md(obd, req->rq_repmsg, offset + 1, body, child_inode, 1); if (!(body->valid & OBD_MD_FLEASIZE)) { body->valid |= (OBD_MD_FLSIZE | OBD_MD_FLBLOCKS | OBD_MD_FLATIME | OBD_MD_FLMTIME); } else { log_unlink = 1; } } /* We have to do these checks ourselves, in case we are making an * orphan. The client tells us whether rmdir() or unlink() was called, * so we need to return appropriate errors (bug 72). * * We don't have to check permissions, because vfs_rename (called from * mds_open_unlink_rename) also calls may_delete. */ if ((rec->ur_mode & S_IFMT) == S_IFDIR) { if (!S_ISDIR(child_inode->i_mode)) GOTO(cleanup, rc = -ENOTDIR); } else { if (S_ISDIR(child_inode->i_mode)) GOTO(cleanup, rc = -EISDIR); } if (child_inode->i_nlink == (S_ISDIR(child_inode->i_mode) ? 2 : 1) && mds_open_orphan_count(child_inode) > 0) { rc = mds_open_unlink_rename(rec, obd, dparent, dchild, &handle); cleanup_phase = 4; /* transaction */ GOTO(cleanup, rc); } /* Step 4: Do the unlink: we already verified ur_mode above (bug 72) */ switch (child_inode->i_mode & S_IFMT) { case S_IFDIR: /* Drop any lingering child directories before we start our * transaction, to avoid doing multiple inode dirty/delete * in our compound transaction (bug 1321). */ shrink_dcache_parent(dchild); handle = fsfilt_start(obd, dparent->d_inode, FSFILT_OP_RMDIR, NULL); if (IS_ERR(handle)) GOTO(cleanup, rc = PTR_ERR(handle)); cleanup_phase = 4; /* transaction */ rc = vfs_rmdir(dparent->d_inode, dchild); break; case S_IFREG: { #warning "optimization is possible here: we could drop nlink w/o removing local dentry in FIDS/" struct lov_mds_md *lmm = lustre_msg_buf(req->rq_repmsg, offset + 1, 0); handle = fsfilt_start_log(obd, dparent->d_inode, FSFILT_OP_UNLINK, NULL, le32_to_cpu(lmm->lmm_stripe_count)); if (IS_ERR(handle)) GOTO(cleanup, rc = PTR_ERR(handle)); cleanup_phase = 4; /* transaction */ rc = vfs_unlink(dparent->d_inode, dchild); if (!rc && log_unlink) if (mds_log_op_unlink(obd, child_inode, lustre_msg_buf(req->rq_repmsg, offset + 1, 0), req->rq_repmsg->buflens[offset + 1], lustre_msg_buf(req->rq_repmsg, offset + 2, 0), req->rq_repmsg->buflens[offset + 2]) > 0) body->valid |= OBD_MD_FLCOOKIE; break; } case S_IFLNK: case S_IFCHR: case S_IFBLK: case S_IFIFO: case S_IFSOCK: handle = fsfilt_start(obd, dparent->d_inode, FSFILT_OP_UNLINK, NULL); if (IS_ERR(handle)) GOTO(cleanup, rc = PTR_ERR(handle)); cleanup_phase = 4; /* transaction */ rc = vfs_unlink(dparent->d_inode, dchild); break; default: CERROR("bad file type %o unlinking %s\n", rec->ur_mode, rec->ur_name); LBUG(); GOTO(cleanup, rc = -EINVAL); } cleanup: if (rc == 0) { struct iattr iattr; int err; iattr.ia_valid = ATTR_MTIME | ATTR_CTIME; LTIME_S(iattr.ia_mtime) = rec->ur_time; LTIME_S(iattr.ia_ctime) = rec->ur_time; err = fsfilt_setattr(obd, dparent, handle, &iattr, 0); if (err) CERROR("error on parent setattr: rc = %d\n", err); } switch(cleanup_phase) { case 4: rc = mds_finish_transno(mds, dparent->d_inode, handle, req, rc, 0); if (!rc) (void)obd_set_info(mds->mds_osc_exp, strlen("unlinked"), "unlinked", 0, NULL); case 3: /* child ino-reuse lock */ if (rc && body != NULL) { // Don't unlink the OST objects if the MDS unlink failed body->valid = 0; } if (rc) ldlm_lock_decref(&child_reuse_lockh, LCK_EX); else ptlrpc_save_lock(req, &child_reuse_lockh, LCK_EX); case 2: /* child lock */ ldlm_lock_decref(&child_lockh, LCK_EX); case 1: /* child and parent dentry, parent lock */ #ifdef S_PDIROPS if (parent_lockh[1].cookie != 0) ldlm_lock_decref(parent_lockh + 1, LCK_CW); #endif if (rc) ldlm_lock_decref(parent_lockh, LCK_PW); else ptlrpc_save_lock(req, parent_lockh, LCK_PW); l_dput(dchild); l_dput(dchild); l_dput(dparent); case 0: break; default: CERROR("invalid cleanup_phase %d\n", cleanup_phase); LBUG(); } req->rq_status = rc; return 0; } /* * to service requests from remote MDS to increment i_nlink */ static int mds_reint_link_acquire(struct mds_update_record *rec, int offset, struct ptlrpc_request *req, struct lustre_handle *lh) { struct obd_device *obd = req->rq_export->exp_obd; struct ldlm_res_id src_res_id = { .name = {0} }; struct lustre_handle *handle = NULL, src_lockh; struct mds_obd *mds = mds_req2mds(req); int rc = 0, cleanup_phase = 0; struct dentry *de_src = NULL; ldlm_policy_data_t policy; int flags = 0; ENTRY; DEBUG_REQ(D_INODE, req, "%s: request to acquire i_nlinks %u/%u/%u\n", obd->obd_name, (unsigned) rec->ur_fid1->mds, (unsigned) rec->ur_fid1->id, (unsigned) rec->ur_fid1->generation); /* Step 1: Lookup the source inode and target directory by FID */ de_src = mds_fid2dentry(mds, rec->ur_fid1, NULL); if (IS_ERR(de_src)) GOTO(cleanup, rc = PTR_ERR(de_src)); cleanup_phase = 1; /* source dentry */ src_res_id.name[0] = de_src->d_inode->i_ino; src_res_id.name[1] = de_src->d_inode->i_generation; policy.l_inodebits.bits = MDS_INODELOCK_UPDATE; rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace, src_res_id, LDLM_IBITS, &policy, LCK_EX, &flags, mds_blocking_ast, ldlm_completion_ast, NULL, NULL, NULL, 0, NULL, &src_lockh); if (rc != ELDLM_OK) GOTO(cleanup, rc = -ENOLCK); cleanup_phase = 2; /* lock */ OBD_FAIL_WRITE(OBD_FAIL_MDS_REINT_LINK_WRITE, de_src->d_inode->i_sb); handle = fsfilt_start(obd, de_src->d_inode, FSFILT_OP_LINK, NULL); if (IS_ERR(handle)) { rc = PTR_ERR(handle); GOTO(cleanup, rc); } de_src->d_inode->i_nlink++; mark_inode_dirty(de_src->d_inode); cleanup: rc = mds_finish_transno(mds, de_src ? de_src->d_inode : NULL, handle, req, rc, 0); EXIT; switch (cleanup_phase) { case 2: if (rc) ldlm_lock_decref(&src_lockh, LCK_EX); else ptlrpc_save_lock(req, &src_lockh, LCK_EX); case 1: l_dput(de_src); case 0: break; default: CERROR("invalid cleanup_phase %d\n", cleanup_phase); LBUG(); } req->rq_status = rc; return 0; } /* * request to link to foreign inode: * - acquire i_nlinks on this inode * - add dentry */ static int mds_reint_link_to_remote(struct mds_update_record *rec, int offset, struct ptlrpc_request *req, struct lustre_handle *lh) { struct lustre_handle *handle = NULL, tgt_dir_lockh[2]; struct obd_device *obd = req->rq_export->exp_obd; struct dentry *de_tgt_dir = NULL; struct mds_obd *mds = mds_req2mds(req); int rc = 0, cleanup_phase = 0; struct mdc_op_data op_data; struct ptlrpc_request *request = NULL; ENTRY; #define fmt "%s: request to link %u/%u/%u:%*s to foreign inode %u/%u/%u\n" DEBUG_REQ(D_INODE, req, fmt, obd->obd_name, (unsigned) rec->ur_fid2->mds, (unsigned) rec->ur_fid2->id, (unsigned) rec->ur_fid2->generation, rec->ur_namelen - 1, rec->ur_name, (unsigned) rec->ur_fid1->mds, (unsigned) rec->ur_fid1->id, (unsigned)rec->ur_fid1->generation); de_tgt_dir = mds_fid2locked_dentry(obd, rec->ur_fid2, NULL, LCK_EX, tgt_dir_lockh, rec->ur_name, rec->ur_namelen - 1, MDS_INODELOCK_UPDATE); if (IS_ERR(de_tgt_dir)) GOTO(cleanup, rc = PTR_ERR(de_tgt_dir)); cleanup_phase = 1; op_data.fid1 = *(rec->ur_fid1); op_data.namelen = 0; op_data.name = NULL; rc = md_link(mds->mds_lmv_exp, &op_data, &request); LASSERT(rc == 0); cleanup_phase = 2; if (request) ptlrpc_req_finished(request); OBD_FAIL_WRITE(OBD_FAIL_MDS_REINT_LINK_WRITE, de_tgt_dir->d_inode->i_sb); handle = fsfilt_start(obd, de_tgt_dir->d_inode, FSFILT_OP_LINK, NULL); if (IS_ERR(handle)) { rc = PTR_ERR(handle); GOTO(cleanup, rc); } rc = fsfilt_add_dir_entry(obd, de_tgt_dir, rec->ur_name, rec->ur_namelen - 1, rec->ur_fid1->id, rec->ur_fid1->generation, rec->ur_fid1->mds); cleanup_phase = 3; cleanup: rc = mds_finish_transno(mds, de_tgt_dir ? de_tgt_dir->d_inode : NULL, handle, req, rc, 0); EXIT; switch (cleanup_phase) { case 3: if (rc) { /* FIXME: drop i_nlink on remote inode here */ CERROR("MUST drop drop i_nlink here\n"); } case 2: case 1: if (rc) { ldlm_lock_decref(tgt_dir_lockh, LCK_EX); #ifdef S_PDIROPS ldlm_lock_decref(tgt_dir_lockh + 1, LCK_CW); #endif } else { ptlrpc_save_lock(req, tgt_dir_lockh, LCK_EX); #ifdef S_PDIROPS ptlrpc_save_lock(req, tgt_dir_lockh + 1, LCK_CW); #endif } l_dput(de_tgt_dir); break; default: CERROR("invalid cleanup_phase %d\n", cleanup_phase); LBUG(); } req->rq_status = rc; return 0; } static int mds_reint_link(struct mds_update_record *rec, int offset, struct ptlrpc_request *req, struct lustre_handle *lh) { struct obd_device *obd = req->rq_export->exp_obd; struct dentry *de_src = NULL; struct dentry *de_tgt_dir = NULL; struct dentry *dchild = NULL; struct mds_obd *mds = mds_req2mds(req); struct lustre_handle *handle = NULL, tgt_dir_lockh[2], src_lockh; struct ldlm_res_id src_res_id = { .name = {0} }; struct ldlm_res_id tgt_dir_res_id = { .name = {0} }; ldlm_policy_data_t src_policy ={.l_inodebits = {MDS_INODELOCK_UPDATE}}; ldlm_policy_data_t tgt_dir_policy = {.l_inodebits = {MDS_INODELOCK_UPDATE}}; int rc = 0, cleanup_phase = 0; ENTRY; LASSERT(offset == 0); DEBUG_REQ(D_INODE, req, "original "LPU64"/%u to "LPU64"/%u %s", rec->ur_fid1->id, rec->ur_fid1->generation, rec->ur_fid2->id, rec->ur_fid2->generation, rec->ur_name); MDS_CHECK_RESENT(req, mds_reconstruct_generic(req)); if (OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_LINK)) GOTO(cleanup, rc = -ENOENT); if (rec->ur_fid1->mds != mds->mds_num) { rc = mds_reint_link_to_remote(rec, offset, req, lh); RETURN(rc); } if (rec->ur_namelen == 1) { rc = mds_reint_link_acquire(rec, offset, req, lh); RETURN(rc); } /* Step 1: Lookup the source inode and target directory by FID */ de_src = mds_fid2dentry(mds, rec->ur_fid1, NULL); if (IS_ERR(de_src)) GOTO(cleanup, rc = PTR_ERR(de_src)); cleanup_phase = 1; /* source dentry */ de_tgt_dir = mds_fid2dentry(mds, rec->ur_fid2, NULL); if (IS_ERR(de_tgt_dir)) GOTO(cleanup, rc = PTR_ERR(de_tgt_dir)); cleanup_phase = 2; /* target directory dentry */ CDEBUG(D_INODE, "linking %*s/%s to inode %lu\n", de_tgt_dir->d_name.len, de_tgt_dir->d_name.name, rec->ur_name, de_src->d_inode->i_ino); /* Step 2: Take the two locks */ src_res_id.name[0] = de_src->d_inode->i_ino; src_res_id.name[1] = de_src->d_inode->i_generation; tgt_dir_res_id.name[0] = de_tgt_dir->d_inode->i_ino; tgt_dir_res_id.name[1] = de_tgt_dir->d_inode->i_generation; #ifdef S_PDIROPS if (IS_PDIROPS(de_tgt_dir->d_inode)) { int flags = 0; /* Get a temp lock on just ino, gen to flush client cache */ rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace, tgt_dir_res_id, LDLM_IBITS, &src_policy, LCK_CW, &flags, mds_blocking_ast, ldlm_completion_ast, NULL, NULL, NULL, 0, NULL, tgt_dir_lockh + 1); if (rc != ELDLM_OK) GOTO(cleanup, rc = -ENOLCK); tgt_dir_res_id.name[2] = full_name_hash(rec->ur_name, rec->ur_namelen - 1); CDEBUG(D_INFO, "take lock on %lu:%u:"LPX64"\n", de_tgt_dir->d_inode->i_ino, de_tgt_dir->d_inode->i_generation, tgt_dir_res_id.name[2]); } #endif rc = enqueue_ordered_locks(obd, &src_res_id, &src_lockh, LCK_EX, &src_policy, &tgt_dir_res_id, tgt_dir_lockh, LCK_EX, &tgt_dir_policy); if (rc) GOTO(cleanup, rc); cleanup_phase = 3; /* locks */ /* Step 3: Lookup the child */ dchild = ll_lookup_one_len(rec->ur_name, de_tgt_dir, rec->ur_namelen-1); if (IS_ERR(dchild)) { rc = PTR_ERR(dchild); if (rc != -EPERM && rc != -EACCES) CERROR("child lookup error %d\n", rc); GOTO(cleanup, rc); } cleanup_phase = 4; /* child dentry */ if (dchild->d_inode) { CDEBUG(D_INODE, "child exists (dir %lu, name %s)\n", de_tgt_dir->d_inode->i_ino, rec->ur_name); rc = -EEXIST; GOTO(cleanup, rc); } /* Step 4: Do it. */ OBD_FAIL_WRITE(OBD_FAIL_MDS_REINT_LINK_WRITE, de_src->d_inode->i_sb); handle = fsfilt_start(obd, de_tgt_dir->d_inode, FSFILT_OP_LINK, NULL); if (IS_ERR(handle)) { rc = PTR_ERR(handle); GOTO(cleanup, rc); } rc = vfs_link(de_src, de_tgt_dir->d_inode, dchild); if (rc && rc != -EPERM && rc != -EACCES) CERROR("vfs_link error %d\n", rc); cleanup: rc = mds_finish_transno(mds, de_tgt_dir ? de_tgt_dir->d_inode : NULL, handle, req, rc, 0); EXIT; switch (cleanup_phase) { case 4: /* child dentry */ l_dput(dchild); case 3: /* locks */ if (rc) { ldlm_lock_decref(&src_lockh, LCK_EX); ldlm_lock_decref(tgt_dir_lockh, LCK_EX); } else { ptlrpc_save_lock(req, &src_lockh, LCK_EX); ptlrpc_save_lock(req, tgt_dir_lockh, LCK_EX); } case 2: /* target dentry */ #ifdef S_PDIROPS if (tgt_dir_lockh[1].cookie) ldlm_lock_decref(tgt_dir_lockh + 1, LCK_CW); #endif if (de_tgt_dir) l_dput(de_tgt_dir); case 1: /* source dentry */ l_dput(de_src); case 0: break; default: CERROR("invalid cleanup_phase %d\n", cleanup_phase); LBUG(); } req->rq_status = rc; return 0; } /* * add a hard link in the PENDING directory, only used by rename() */ static int mds_add_link_orphan(struct mds_update_record *rec, struct obd_device *obd, struct dentry *dentry) { struct mds_obd *mds = &obd->u.mds; struct inode *pending_dir = mds->mds_pending_dir->d_inode; struct dentry *pending_child; char fidname[LL_FID_NAMELEN]; int fidlen = 0, rc; ENTRY; LASSERT(dentry->d_inode); LASSERT(!mds_inode_is_orphan(dentry->d_inode)); down(&pending_dir->i_sem); fidlen = ll_fid2str(fidname, dentry->d_inode->i_ino, dentry->d_inode->i_generation); CDEBUG(D_ERROR, "pending destroy of %dx open file %s = %s\n", mds_open_orphan_count(dentry->d_inode), rec->ur_name, fidname); pending_child = lookup_one_len(fidname, mds->mds_pending_dir, fidlen); if (IS_ERR(pending_child)) GOTO(out_lock, rc = PTR_ERR(pending_child)); if (pending_child->d_inode != NULL) { CERROR("re-destroying orphan file %s?\n", rec->ur_name); LASSERT(pending_child->d_inode == dentry->d_inode); GOTO(out_dput, rc = 0); } lock_kernel(); rc = vfs_link(dentry, pending_dir, pending_child); unlock_kernel(); if (rc) CERROR("error addlink orphan %s to PENDING: rc = %d\n", rec->ur_name, rc); else mds_inode_set_orphan(dentry->d_inode); out_dput: l_dput(pending_child); out_lock: up(&pending_dir->i_sem); RETURN(rc); } /* The idea here is that we need to get four locks in the end: * one on each parent directory, one on each child. We need to take * these locks in some kind of order (to avoid deadlocks), and the order * I selected is "increasing resource number" order. We need to look up * the children, however, before we know what the resource number(s) are. * Thus the following plan: * * 1,2. Look up the parents * 3,4. Look up the children * 5. Take locks on the parents and children, in order * 6. Verify that the children haven't changed since they were looked up * * If there was a race and the children changed since they were first looked * up, it is possible that mds_verify_child() will be able to just grab the * lock on the new child resource (if it has a higher resource than any other) * but we need to compare against not only its parent, but also against the * parent and child of the "other half" of the rename, hence maxres_{src,tgt}. * * We need the fancy igrab() on the child inodes because we aren't holding a * lock on the parent after the lookup is done, so dentry->d_inode may change * at any time, and igrab() itself doesn't like getting passed a NULL argument. */ static int mds_get_parents_children_locked(struct obd_device *obd, struct mds_obd *mds, struct ll_fid *p1_fid, struct dentry **de_srcdirp, struct ll_fid *p2_fid, struct dentry **de_tgtdirp, int parent_mode, const char *old_name, int old_len, struct dentry **de_oldp, const char *new_name, int new_len, struct dentry **de_newp, struct lustre_handle *dlm_handles, int child_mode) { struct ldlm_res_id p1_res_id = { .name = {0} }; struct ldlm_res_id p2_res_id = { .name = {0} }; struct ldlm_res_id c1_res_id = { .name = {0} }; struct ldlm_res_id c2_res_id = { .name = {0} }; ldlm_policy_data_t p_policy = {.l_inodebits = {MDS_INODELOCK_UPDATE}}; /* Only dentry should change, but the inode itself would be intact otherwise */ ldlm_policy_data_t c1_policy = {.l_inodebits = {MDS_INODELOCK_LOOKUP}}; /* If something is going to be replaced, both dentry and inode locks are needed */ ldlm_policy_data_t c2_policy = {.l_inodebits = {MDS_INODELOCK_LOOKUP| MDS_INODELOCK_UPDATE}}; struct ldlm_res_id *maxres_src, *maxres_tgt; struct inode *inode; int rc = 0, cleanup_phase = 0; ENTRY; /* Step 1: Lookup the source directory */ *de_srcdirp = mds_fid2dentry(mds, p1_fid, NULL); if (IS_ERR(*de_srcdirp)) GOTO(cleanup, rc = PTR_ERR(*de_srcdirp)); cleanup_phase = 1; /* source directory dentry */ p1_res_id.name[0] = (*de_srcdirp)->d_inode->i_ino; p1_res_id.name[1] = (*de_srcdirp)->d_inode->i_generation; /* Step 2: Lookup the target directory */ if (memcmp(p1_fid, p2_fid, sizeof(*p1_fid)) == 0) { *de_tgtdirp = dget(*de_srcdirp); } else { *de_tgtdirp = mds_fid2dentry(mds, p2_fid, NULL); if (IS_ERR(*de_tgtdirp)) GOTO(cleanup, rc = PTR_ERR(*de_tgtdirp)); } cleanup_phase = 2; /* target directory dentry */ p2_res_id.name[0] = (*de_tgtdirp)->d_inode->i_ino; p2_res_id.name[1] = (*de_tgtdirp)->d_inode->i_generation; #ifdef S_PDIROPS dlm_handles[5].cookie = 0; dlm_handles[6].cookie = 0; if (IS_PDIROPS((*de_srcdirp)->d_inode)) { /* Get a temp lock on just ino, gen to flush client cache */ rc = enqueue_ordered_locks(obd, &p1_res_id, &(dlm_handles[5]), LCK_CW, &p_policy, &p2_res_id, &(dlm_handles[6]),LCK_CW,&p_policy); if (rc != ELDLM_OK) GOTO(cleanup, rc); p1_res_id.name[2] = full_name_hash(old_name, old_len - 1); p2_res_id.name[2] = full_name_hash(new_name, new_len - 1); CDEBUG(D_INFO, "take locks on %lu:%u:"LPX64", %lu:%u:"LPX64"\n", (*de_srcdirp)->d_inode->i_ino, (*de_srcdirp)->d_inode->i_generation, p1_res_id.name[2], (*de_tgtdirp)->d_inode->i_ino, (*de_tgtdirp)->d_inode->i_generation, p2_res_id.name[2]); } #endif /* Step 3: Lookup the source child entry */ *de_oldp = ll_lookup_one_len(old_name, *de_srcdirp, old_len - 1); if (IS_ERR(*de_oldp)) { rc = PTR_ERR(*de_oldp); CERROR("old child lookup error (%*s): %d\n", old_len - 1, old_name, rc); GOTO(cleanup, rc); } cleanup_phase = 3; /* original name dentry */ inode = (*de_oldp)->d_inode; if (inode != NULL) { inode = igrab(inode); if (inode == NULL) GOTO(cleanup, rc = -ENOENT); c1_res_id.name[0] = inode->i_ino; c1_res_id.name[1] = inode->i_generation; iput(inode); } else if ((*de_oldp)->d_flags & DCACHE_CROSS_REF) { c1_res_id.name[0] = (*de_oldp)->d_inum; c1_res_id.name[1] = (*de_oldp)->d_generation; } /* Step 4: Lookup the target child entry */ *de_newp = ll_lookup_one_len(new_name, *de_tgtdirp, new_len - 1); if (IS_ERR(*de_newp)) { rc = PTR_ERR(*de_newp); CERROR("new child lookup error (%*s): %d\n", old_len - 1, old_name, rc); GOTO(cleanup, rc); } cleanup_phase = 4; /* target dentry */ inode = (*de_newp)->d_inode; if (inode != NULL) { inode = igrab(inode); if (inode == NULL) goto retry_locks; c2_res_id.name[0] = inode->i_ino; c2_res_id.name[1] = inode->i_generation; iput(inode); } else if ((*de_newp)->d_flags & DCACHE_CROSS_REF) { c2_res_id.name[0] = (*de_newp)->d_inum; c2_res_id.name[1] = (*de_newp)->d_generation; } retry_locks: /* Step 5: Take locks on the parents and child(ren) */ maxres_src = &p1_res_id; maxres_tgt = &p2_res_id; cleanup_phase = 4; /* target dentry */ if (c1_res_id.name[0] != 0 && res_gt(&c1_res_id, &p1_res_id, NULL,NULL)) maxres_src = &c1_res_id; if (c2_res_id.name[0] != 0 && res_gt(&c2_res_id, &p2_res_id, NULL,NULL)) maxres_tgt = &c2_res_id; rc = enqueue_4ordered_locks(obd, &p1_res_id,&dlm_handles[0],parent_mode, &p_policy, &p2_res_id, &dlm_handles[1], parent_mode, &p_policy, &c1_res_id, &dlm_handles[2], child_mode, &c1_policy, &c2_res_id, &dlm_handles[3], child_mode, &c2_policy); if (rc) GOTO(cleanup, rc); cleanup_phase = 6; /* parent and child(ren) locks */ /* Step 6a: Re-lookup source child to verify it hasn't changed */ rc = mds_verify_child(obd, &p1_res_id, &dlm_handles[0], *de_srcdirp, parent_mode, &c1_res_id, &dlm_handles[2], de_oldp, child_mode, &c1_policy, old_name,old_len, maxres_tgt); if (rc) { if (c2_res_id.name[0] != 0) ldlm_lock_decref(&dlm_handles[3], child_mode); ldlm_lock_decref(&dlm_handles[1], parent_mode); cleanup_phase = 4; if (rc > 0) goto retry_locks; GOTO(cleanup, rc); } if (!DENTRY_VALID(*de_oldp)) GOTO(cleanup, rc = -ENOENT); /* Step 6b: Re-lookup target child to verify it hasn't changed */ rc = mds_verify_child(obd, &p2_res_id, &dlm_handles[1], *de_tgtdirp, parent_mode, &c2_res_id, &dlm_handles[3], de_newp, child_mode, &c2_policy, new_name, new_len, maxres_src); if (rc) { ldlm_lock_decref(&dlm_handles[2], child_mode); ldlm_lock_decref(&dlm_handles[0], parent_mode); cleanup_phase = 4; if (rc > 0) goto retry_locks; GOTO(cleanup, rc); } EXIT; cleanup: if (rc) { switch (cleanup_phase) { case 6: /* child lock(s) */ if (c2_res_id.name[0] != 0) ldlm_lock_decref(&dlm_handles[3], child_mode); if (c1_res_id.name[0] != 0) ldlm_lock_decref(&dlm_handles[2], child_mode); case 5: /* parent locks */ ldlm_lock_decref(&dlm_handles[1], parent_mode); ldlm_lock_decref(&dlm_handles[0], parent_mode); case 4: /* target dentry */ l_dput(*de_newp); case 3: /* source dentry */ l_dput(*de_oldp); case 2: /* target directory dentry */ l_dput(*de_tgtdirp); case 1: /* source directry dentry */ l_dput(*de_srcdirp); } } return rc; } static int mds_reint_rename_create_name(struct mds_update_record *rec, int offset, struct ptlrpc_request *req) { struct obd_device *obd = req->rq_export->exp_obd; struct dentry *de_srcdir = NULL; struct dentry *de_new = NULL; struct mds_obd *mds = mds_req2mds(req); struct lustre_handle parent_lockh[2]; struct lustre_handle child_lockh; int cleanup_phase = 0; void *handle = NULL; int rc = 0; ENTRY; /* another MDS executing rename operation has asked us * to create target name. such a creation should destroy * existing target name */ CDEBUG(D_OTHER, "%s: request to create name %s for %lu/%lu/%lu\n", obd->obd_name, rec->ur_tgt, (unsigned long) rec->ur_fid1->mds, (unsigned long) rec->ur_fid1->id, (unsigned long) rec->ur_fid1->generation); /* first, lookup the target */ child_lockh.cookie = 0; rc = mds_get_parent_child_locked(obd, mds, rec->ur_fid2, parent_lockh, &de_srcdir,LCK_PW,MDS_INODELOCK_UPDATE, rec->ur_tgt, rec->ur_tgtlen, &child_lockh, &de_new, LCK_EX, MDS_INODELOCK_LOOKUP); if (rc) GOTO(cleanup, rc); cleanup_phase = 1; LASSERT(de_srcdir); LASSERT(de_srcdir->d_inode); LASSERT(de_new); if (de_new->d_inode) { /* name exists and points to local inode * try to unlink this name and create new one */ CERROR("%s: %s points to local inode %lu/%lu\n", obd->obd_name, rec->ur_tgt, (unsigned long) de_new->d_inode->i_ino, (unsigned long) de_new->d_inode->i_generation); handle = fsfilt_start(obd, de_srcdir->d_inode, FSFILT_OP_RENAME, NULL); if (IS_ERR(handle)) GOTO(cleanup, rc = PTR_ERR(handle)); rc = fsfilt_del_dir_entry(req->rq_export->exp_obd, de_new); if (rc) GOTO(cleanup, rc); } else if (de_new->d_flags & DCACHE_CROSS_REF) { /* name exists adn points to remove inode */ CERROR("%s: %s points to remote inode %lu/%lu/%lu\n", obd->obd_name, rec->ur_tgt, (unsigned long) de_new->d_mdsnum, (unsigned long) de_new->d_inum, (unsigned long) de_new->d_generation); } else { /* name doesn't exist. the simplest case */ handle = fsfilt_start(obd, de_srcdir->d_inode, FSFILT_OP_LINK, NULL); if (IS_ERR(handle)) GOTO(cleanup, rc = PTR_ERR(handle)); } cleanup_phase = 2; rc = fsfilt_add_dir_entry(obd, de_srcdir, rec->ur_tgt, rec->ur_tgtlen - 1, rec->ur_fid1->id, rec->ur_fid1->generation, rec->ur_fid1->mds); if (rc) CERROR("add_dir_entry() returned error %d\n", rc); cleanup: EXIT; rc = mds_finish_transno(mds, de_srcdir ? de_srcdir->d_inode : NULL, handle, req, rc, 0); switch(cleanup_phase) { case 2: case 1: #ifdef S_PDIROPS if (parent_lockh[1].cookie != 0) ldlm_lock_decref(&parent_lockh[1], LCK_CW); #endif ldlm_lock_decref(&parent_lockh[0], LCK_PW); if (child_lockh.cookie != 0) ldlm_lock_decref(&child_lockh, LCK_EX); l_dput(de_new); l_dput(de_srcdir); break; default: LBUG(); } req->rq_status = rc; RETURN(0); } static int mds_reint_rename_to_remote(struct mds_update_record *rec, int offset, struct ptlrpc_request *req) { struct obd_device *obd = req->rq_export->exp_obd; struct ptlrpc_request *req2 = NULL; struct dentry *de_srcdir = NULL; struct dentry *de_old = NULL; struct mds_obd *mds = mds_req2mds(req); struct lustre_handle parent_lockh[2]; struct lustre_handle child_lockh; struct mdc_op_data opdata; int cleanup_phase = 0; void *handle = NULL; int rc = 0; ENTRY; CDEBUG(D_OTHER, "%s: move name %s onto another mds%u\n", obd->obd_name, rec->ur_name, rec->ur_fid2->mds + 1); memset(&opdata, 0, sizeof(opdata)); child_lockh.cookie = 0; rc = mds_get_parent_child_locked(obd, mds, rec->ur_fid1, parent_lockh, &de_srcdir,LCK_PW,MDS_INODELOCK_UPDATE, rec->ur_name, rec->ur_namelen, &child_lockh, &de_old, LCK_EX, MDS_INODELOCK_LOOKUP); LASSERT(rc == 0); LASSERT(de_srcdir); LASSERT(de_srcdir->d_inode); LASSERT(de_old); /* we already know the target should be created on another MDS * so, we have to request that MDS to do it */ /* prepare source fid */ if (de_old->d_flags & DCACHE_CROSS_REF) { LASSERT(de_old->d_inode == NULL); CDEBUG(D_OTHER, "request to move remote name\n"); opdata.fid1.mds = de_old->d_mdsnum; opdata.fid1.id = de_old->d_inum; opdata.fid1.generation = de_old->d_generation; } else if (de_old->d_inode == NULL) { /* oh, source doesn't exist */ GOTO(cleanup, rc = -ENOENT); } else { LASSERT(de_old->d_inode != NULL); CDEBUG(D_OTHER, "request to move local name\n"); opdata.fid1.mds = mds->mds_num; opdata.fid1.id = de_old->d_inode->i_ino; opdata.fid1.generation = de_old->d_inode->i_generation; } opdata.fid2 = *(rec->ur_fid2); rc = md_rename(mds->mds_lmv_exp, &opdata, NULL, 0, rec->ur_tgt, rec->ur_tgtlen - 1, &req2); if (rc) GOTO(cleanup, rc); handle = fsfilt_start(obd, de_srcdir->d_inode, FSFILT_OP_UNLINK, NULL); if (IS_ERR(handle)) GOTO(cleanup, rc = PTR_ERR(handle)); rc = fsfilt_del_dir_entry(obd, de_old); d_drop(de_old); cleanup: EXIT; rc = mds_finish_transno(mds, de_srcdir ? de_srcdir->d_inode : NULL, handle, req, rc, 0); if (req2) ptlrpc_req_finished(req2); #ifdef S_PDIROPS if (parent_lockh[1].cookie != 0) ldlm_lock_decref(&parent_lockh[1], LCK_CW); #endif ldlm_lock_decref(&parent_lockh[0], LCK_PW); if (child_lockh.cookie != 0) ldlm_lock_decref(&child_lockh, LCK_EX); l_dput(de_old); l_dput(de_srcdir); req->rq_status = rc; RETURN(0); } static int mds_reint_rename(struct mds_update_record *rec, int offset, struct ptlrpc_request *req, struct lustre_handle *lockh) { struct obd_device *obd = req->rq_export->exp_obd; struct dentry *de_srcdir = NULL; struct dentry *de_tgtdir = NULL; struct dentry *de_old = NULL; struct dentry *de_new = NULL; struct mds_obd *mds = mds_req2mds(req); struct lustre_handle dlm_handles[7]; struct mds_body *body = NULL; int rc = 0, lock_count = 3; int cleanup_phase = 0; void *handle = NULL; ENTRY; LASSERT(offset == 0); DEBUG_REQ(D_INODE, req, "parent "LPU64"/%u %s to "LPU64"/%u %s", rec->ur_fid1->id, rec->ur_fid1->generation, rec->ur_name, rec->ur_fid2->id, rec->ur_fid2->generation, rec->ur_tgt); MDS_CHECK_RESENT(req, mds_reconstruct_generic(req)); if (rec->ur_namelen == 1) { rc = mds_reint_rename_create_name(rec, offset, req); RETURN(rc); } if (rec->ur_fid2->mds != mds->mds_num) { rc = mds_reint_rename_to_remote(rec, offset, req); RETURN(rc); } rc = mds_get_parents_children_locked(obd, mds, rec->ur_fid1, &de_srcdir, rec->ur_fid2, &de_tgtdir, LCK_PW, rec->ur_name, rec->ur_namelen, &de_old, rec->ur_tgt, rec->ur_tgtlen, &de_new, dlm_handles, LCK_EX); if (rc) GOTO(cleanup, rc); cleanup_phase = 1; /* parent(s), children, locks */ if (de_new->d_inode) lock_count = 4; /* sanity check for src inode */ if (de_old->d_inode->i_ino == de_srcdir->d_inode->i_ino || de_old->d_inode->i_ino == de_tgtdir->d_inode->i_ino) GOTO(cleanup, rc = -EINVAL); /* sanity check for dest inode */ if (de_new->d_inode && (de_new->d_inode->i_ino == de_srcdir->d_inode->i_ino || de_new->d_inode->i_ino == de_tgtdir->d_inode->i_ino)) GOTO(cleanup, rc = -EINVAL); if (de_old->d_inode == de_new->d_inode) { GOTO(cleanup, rc = 0); } /* if we are about to remove the target at first, pass the EA of * that inode to client to perform and cleanup on OST */ body = lustre_msg_buf(req->rq_repmsg, 0, sizeof (*body)); LASSERT(body != NULL); if (de_new->d_inode && S_ISREG(de_new->d_inode->i_mode) && de_new->d_inode->i_nlink == 1 && mds_open_orphan_count(de_new->d_inode) == 0) { mds_pack_inode2fid(obd, &body->fid1, de_new->d_inode); mds_pack_inode2body(obd, body, de_new->d_inode); mds_pack_md(obd, req->rq_repmsg, 1, body, de_new->d_inode, 1); if (!(body->valid & OBD_MD_FLEASIZE)) { body->valid |= (OBD_MD_FLSIZE | OBD_MD_FLBLOCKS | OBD_MD_FLATIME | OBD_MD_FLMTIME); } else { /* XXX need log unlink? */ } } OBD_FAIL_WRITE(OBD_FAIL_MDS_REINT_RENAME_WRITE, de_srcdir->d_inode->i_sb); handle = fsfilt_start(obd, de_tgtdir->d_inode, FSFILT_OP_RENAME, NULL); if (IS_ERR(handle)) GOTO(cleanup, rc = PTR_ERR(handle)); /* FIXME need adjust the journal block count? */ /* if the target should be moved to PENDING, we at first increase the * link and later vfs_rename() will decrease the link count again */ if (de_new->d_inode && S_ISREG(de_new->d_inode->i_mode) && de_new->d_inode->i_nlink == 1 && mds_open_orphan_count(de_new->d_inode) > 0) { rc = mds_add_link_orphan(rec, obd, de_new); if (rc) GOTO(cleanup, rc); } lock_kernel(); de_old->d_fsdata = req; de_new->d_fsdata = req; rc = vfs_rename(de_srcdir->d_inode, de_old, de_tgtdir->d_inode, de_new); unlock_kernel(); GOTO(cleanup, rc); cleanup: rc = mds_finish_transno(mds, de_tgtdir ? de_tgtdir->d_inode : NULL, handle, req, rc, 0); switch (cleanup_phase) { case 1: #ifdef S_PDIROPS if (dlm_handles[5].cookie != 0) ldlm_lock_decref(&(dlm_handles[5]), LCK_CW); if (dlm_handles[6].cookie != 0) ldlm_lock_decref(&(dlm_handles[6]), LCK_CW); #endif if (rc) { if (lock_count == 4) ldlm_lock_decref(&(dlm_handles[3]), LCK_EX); ldlm_lock_decref(&(dlm_handles[2]), LCK_EX); ldlm_lock_decref(&(dlm_handles[1]), LCK_PW); ldlm_lock_decref(&(dlm_handles[0]), LCK_PW); } else { if (lock_count == 4) ptlrpc_save_lock(req,&(dlm_handles[3]), LCK_EX); ptlrpc_save_lock(req, &(dlm_handles[2]), LCK_EX); ptlrpc_save_lock(req, &(dlm_handles[1]), LCK_PW); ptlrpc_save_lock(req, &(dlm_handles[0]), LCK_PW); } l_dput(de_new); l_dput(de_old); l_dput(de_tgtdir); l_dput(de_srcdir); case 0: break; default: CERROR("invalid cleanup_phase %d\n", cleanup_phase); LBUG(); } req->rq_status = rc; return 0; } typedef int (*mds_reinter)(struct mds_update_record *, int offset, struct ptlrpc_request *, struct lustre_handle *); static mds_reinter reinters[REINT_MAX + 1] = { [REINT_SETATTR] mds_reint_setattr, [REINT_CREATE] mds_reint_create, [REINT_LINK] mds_reint_link, [REINT_UNLINK] mds_reint_unlink, [REINT_RENAME] mds_reint_rename, [REINT_OPEN] mds_open }; int mds_reint_rec(struct mds_update_record *rec, int offset, struct ptlrpc_request *req, struct lustre_handle *lockh) { struct obd_device *obd = req->rq_export->exp_obd; struct obd_run_ctxt saved; int rc; /* checked by unpacker */ LASSERT(rec->ur_opcode <= REINT_MAX && reinters[rec->ur_opcode] != NULL); push_ctxt(&saved, &obd->obd_ctxt, &rec->ur_uc); rc = reinters[rec->ur_opcode] (rec, offset, req, lockh); pop_ctxt(&saved, &obd->obd_ctxt, &rec->ur_uc); return rc; }