1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
5 * Lustre Metadata Server (mds) request handler
7 * Copyright (c) 2001, 2002 Cluster File Systems, Inc.
8 * Author: Peter Braam <braam@clusterfs.com>
9 * Author: Andreas Dilger <adilger@clusterfs.com>
10 * Author: Phil Schwan <phil@clusterfs.com>
12 * This file is part of Lustre, http://www.lustre.org.
14 * Lustre is free software; you can redistribute it and/or
15 * modify it under the terms of version 2 of the GNU General Public
16 * License as published by the Free Software Foundation.
18 * Lustre is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with Lustre; if not, write to the Free Software
25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29 #define DEBUG_SUBSYSTEM S_MDS
31 #include <linux/module.h>
32 #include <linux/lustre_mds.h>
33 #include <linux/lustre_dlm.h>
34 #include <linux/init.h>
35 #include <linux/obd_class.h>
37 extern int mds_get_lovtgts(struct obd_device *obd, int tgt_count,
38 obd_uuid_t *uuidarray);
39 extern int mds_get_lovdesc(struct obd_device *obd, struct lov_desc *desc);
40 extern int mds_update_last_rcvd(struct mds_obd *mds, void *handle,
41 struct ptlrpc_request *req);
42 static int mds_cleanup(struct obd_device * obddev);
44 inline struct mds_obd *mds_req2mds(struct ptlrpc_request *req)
46 return &req->rq_export->exp_obd->u.mds;
49 static int mds_bulk_timeout(void *data)
51 struct ptlrpc_bulk_desc *desc = data;
54 CERROR("(not yet) starting recovery of client %p\n", desc->bd_client);
58 /* Assumes caller has already pushed into the kernel filesystem context */
59 static int mds_sendpage(struct ptlrpc_request *req, struct file *file,
63 struct mds_obd *mds = mds_req2mds(req);
64 struct ptlrpc_bulk_desc *desc;
65 struct ptlrpc_bulk_page *bulk;
66 struct l_wait_info lwi;
70 desc = ptlrpc_prep_bulk(req->rq_connection);
72 GOTO(out, rc = -ENOMEM);
74 bulk = ptlrpc_prep_bulk_page(desc);
76 GOTO(cleanup_bulk, rc = -ENOMEM);
78 OBD_ALLOC(buf, PAGE_SIZE);
80 GOTO(cleanup_bulk, rc = -ENOMEM);
82 rc = mds_fs_readpage(mds, file, buf, PAGE_SIZE, (loff_t *)&offset);
85 GOTO(cleanup_buf, rc = -EIO);
87 bulk->bp_xid = req->rq_xid;
89 bulk->bp_buflen = PAGE_SIZE;
90 desc->bd_portal = MDS_BULK_PORTAL;
92 rc = ptlrpc_send_bulk(desc);
94 GOTO(cleanup_buf, rc);
96 if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE)) {
97 CERROR("obd_fail_loc=%x, fail operation rc=%d\n",
98 OBD_FAIL_MDS_SENDPAGE, rc);
99 ptlrpc_abort_bulk(desc);
100 GOTO(cleanup_buf, rc);
103 lwi = LWI_TIMEOUT(obd_timeout * HZ, mds_bulk_timeout, desc);
104 rc = l_wait_event(desc->bd_waitq, desc->bd_flags & PTL_BULK_FL_SENT, &lwi);
106 if (rc != -ETIMEDOUT)
108 GOTO(cleanup_buf, rc);
113 OBD_FREE(buf, PAGE_SIZE);
115 ptlrpc_free_bulk(desc);
121 * Look up a named entry in a directory, and get an LDLM lock on it.
122 * 'dir' is a inode for which an LDLM lock has already been taken.
124 * If we do not need an exclusive or write lock on this entry (e.g.
125 * a read lock for attribute lookup only) then we do not hold the
126 * directory on return. It is up to the caller to know what type
127 * of lock it is getting, and clean up appropriately.
129 struct dentry *mds_name2locked_dentry(struct obd_device *obd,
130 struct dentry *dir, struct vfsmount **mnt,
131 char *name, int namelen, int lock_mode,
132 struct lustre_handle *lockh,
135 struct dentry *dchild;
137 __u64 res_id[3] = {0};
140 down(&dir->d_inode->i_sem);
141 dchild = lookup_one_len(name, dir, namelen);
142 if (IS_ERR(dchild)) {
143 CERROR("child lookup error %ld\n", PTR_ERR(dchild));
144 up(&dir->d_inode->i_sem);
148 if (dir_lock_mode != LCK_EX && dir_lock_mode != LCK_PW) {
149 up(&dir->d_inode->i_sem);
150 ldlm_lock_decref(lockh, dir_lock_mode);
153 if (lock_mode == 0 || !dchild->d_inode)
156 res_id[0] = dchild->d_inode->i_ino;
157 rc = ldlm_match_or_enqueue(NULL, NULL, obd->obd_namespace, NULL,
158 res_id, LDLM_PLAIN, NULL, 0, lock_mode,
159 &flags, ldlm_completion_ast,
160 mds_blocking_ast, NULL, 0, lockh);
161 if (rc != ELDLM_OK) {
163 up(&dir->d_inode->i_sem);
164 RETURN(ERR_PTR(-ENOLCK)); /* XXX translate ldlm code */
170 struct dentry *mds_fid2locked_dentry(struct obd_device *obd, struct ll_fid *fid,
171 struct vfsmount **mnt, int lock_mode,
172 struct lustre_handle *lockh)
174 struct mds_obd *mds = &obd->u.mds;
175 struct dentry *de = mds_fid2dentry(mds, fid, mnt), *retval = de;
177 __u64 res_id[3] = {0};
183 res_id[0] = de->d_inode->i_ino;
184 rc = ldlm_match_or_enqueue(NULL, NULL, obd->obd_namespace, NULL,
185 res_id, LDLM_PLAIN, NULL, 0, lock_mode,
186 &flags, ldlm_completion_ast,
187 mds_blocking_ast, NULL, 0, lockh);
188 if (rc != ELDLM_OK) {
190 retval = ERR_PTR(-ENOLCK); /* XXX translate ldlm code */
196 /* Look up an entry by inode number. */
197 struct dentry *mds_fid2dentry(struct mds_obd *mds, struct ll_fid *fid,
198 struct vfsmount **mnt)
200 /* stolen from NFS */
201 struct super_block *sb = mds->mds_sb;
202 unsigned long ino = fid->id;
203 __u32 generation = fid->generation;
205 struct list_head *lp;
206 struct dentry *result;
209 RETURN(ERR_PTR(-ESTALE));
211 inode = iget(sb, ino);
213 RETURN(ERR_PTR(-ENOMEM));
215 CDEBUG(D_DENTRY, "--> mds_fid2dentry: sb %p\n", inode->i_sb);
217 if (is_bad_inode(inode) ||
218 (generation && inode->i_generation != generation)) {
219 /* we didn't find the right inode.. */
220 CERROR("bad inode %lu, link: %d ct: %d or version %u/%u\n",
221 inode->i_ino, inode->i_nlink,
222 atomic_read(&inode->i_count), inode->i_generation,
226 RETURN(ERR_PTR(-ESTALE));
229 /* now to find a dentry. If possible, get a well-connected one */
231 *mnt = mds->mds_vfsmnt;
232 spin_lock(&dcache_lock);
233 list_for_each(lp, &inode->i_dentry) {
234 result = list_entry(lp, struct dentry, d_alias);
235 if (!(result->d_flags & DCACHE_NFSD_DISCONNECTED)) {
237 result->d_vfs_flags |= DCACHE_REFERENCED;
238 spin_unlock(&dcache_lock);
245 spin_unlock(&dcache_lock);
246 result = d_alloc_root(inode);
247 if (result == NULL) {
249 return ERR_PTR(-ENOMEM);
253 result->d_flags |= DCACHE_NFSD_DISCONNECTED;
257 /* Establish a connection to the MDS.
259 * This will set up an export structure for the client to hold state data
260 * about that client, like open files, the last operation number it did
261 * on the server, etc.
263 static int mds_connect(struct lustre_handle *conn, struct obd_device *obd,
266 struct obd_export *exp;
267 struct mds_client_data *mcd;
272 if (!conn || !obd || !cluuid)
277 spin_lock(&obd->obd_dev_lock);
278 list_for_each(p, &obd->obd_exports) {
279 exp = list_entry(p, struct obd_export, exp_obd_chain);
280 mcd = exp->exp_mds_data.med_mcd;
281 if (!memcmp(cluuid, mcd->mcd_uuid, sizeof(mcd->mcd_uuid))) {
282 LASSERT(exp->exp_obd == obd);
284 if (!list_empty(&exp->exp_conn_chain)) {
285 CERROR("existing uuid/export, list not empty!\n");
286 spin_unlock(&obd->obd_dev_lock);
289 conn->addr = (__u64) (unsigned long)exp;
290 conn->cookie = exp->exp_cookie;
291 spin_unlock(&obd->obd_dev_lock);
292 CDEBUG(D_INFO, "existing export for UUID '%s' at %p\n",
294 CDEBUG(D_IOCTL,"connect: addr %Lx cookie %Lx\n",
295 (long long)conn->addr, (long long)conn->cookie);
299 spin_unlock(&obd->obd_dev_lock);
300 /* XXX There is a small race between checking the list and adding a
301 * new connection for the same UUID, but the real threat (list
302 * corruption when multiple different clients connect) is solved.
304 rc = class_connect(conn, obd, cluuid);
307 exp = class_conn2export(conn);
310 OBD_ALLOC(mcd, sizeof(*mcd));
312 CERROR("mds: out of memory for client data\n");
313 GOTO(out_export, rc = -ENOMEM);
315 memcpy(mcd->mcd_uuid, cluuid, sizeof(mcd->mcd_uuid));
316 exp->exp_mds_data.med_mcd = mcd;
317 rc = mds_client_add(&exp->exp_mds_data, -1);
324 OBD_FREE(mcd, sizeof(*mcd));
326 class_disconnect(conn);
333 static int mds_disconnect(struct lustre_handle *conn)
337 rc = class_disconnect(conn);
344 static int mds_getstatus(struct ptlrpc_request *req)
346 struct mds_obd *mds = mds_req2mds(req);
347 struct mds_body *body;
348 int rc, size = sizeof(*body);
351 rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
352 if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_GETSTATUS_PACK)) {
353 CERROR("mds: out of memory for message: size=%d\n", size);
354 req->rq_status = -ENOMEM;
358 /* Anything we need to do here with the client's trans no or so? */
359 body = lustre_msg_buf(req->rq_repmsg, 0);
360 memcpy(&body->fid1, &mds->mds_rootfid, sizeof(body->fid1));
362 /* the last_committed and last_xid fields are filled in for all
363 * replies already - no need to do so here also.
368 static int mds_getlovinfo(struct ptlrpc_request *req)
370 struct mds_obd *mds = mds_req2mds(req);
371 struct mds_status_req *streq;
372 struct lov_desc *desc;
374 int rc, size[2] = {sizeof(*desc)};
377 streq = lustre_msg_buf(req->rq_reqmsg, 0);
378 streq->flags = NTOH__u32(streq->flags);
379 streq->repbuf = NTOH__u32(streq->repbuf);
380 size[1] = streq->repbuf;
382 rc = lustre_pack_msg(2, size, NULL, &req->rq_replen, &req->rq_repmsg);
384 CERROR("mds: out of memory for message: size=%d\n", size[1]);
385 req->rq_status = -ENOMEM;
389 desc = lustre_msg_buf(req->rq_repmsg, 0);
390 rc = mds_get_lovdesc(req->rq_obd, desc);
392 CERROR("mds_get_lovdesc error %d", rc);
397 tgt_count = le32_to_cpu(desc->ld_tgt_count);
398 if (tgt_count * sizeof(obd_uuid_t) > streq->repbuf) {
399 CERROR("too many targets, enlarge client buffers\n");
400 req->rq_status = -ENOSPC;
404 mds->mds_max_mdsize = sizeof(struct lov_mds_md) +
405 tgt_count * sizeof(struct lov_object_id);
406 rc = mds_get_lovtgts(req->rq_obd, tgt_count,
407 lustre_msg_buf(req->rq_repmsg, 1));
409 CERROR("get_lovtgts error %d\n", rc);
416 int mds_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
417 void *data, __u32 data_len)
422 l_lock(&lock->l_resource->lr_namespace->ns_lock);
423 lock->l_flags |= LDLM_FL_CBPENDING;
424 do_ast = (!lock->l_readers && !lock->l_writers);
425 l_unlock(&lock->l_resource->lr_namespace->ns_lock);
428 struct lustre_handle lockh;
431 LDLM_DEBUG(lock, "already unused, calling ldlm_cli_cancel");
432 ldlm_lock2handle(lock, &lockh);
433 rc = ldlm_cli_cancel(&lockh);
435 CERROR("ldlm_cli_cancel: %d\n", rc);
437 LDLM_DEBUG(lock, "Lock still has references, will be"
442 static int mds_getattr_internal(struct mds_obd *mds, struct dentry *dentry,
443 struct ptlrpc_request *req,
444 struct mds_body *reqbody, int reply_off)
446 struct mds_body *body;
447 struct inode *inode = dentry->d_inode;
454 body = lustre_msg_buf(req->rq_repmsg, reply_off);
456 mds_pack_inode2fid(&body->fid1, inode);
457 mds_pack_inode2body(body, inode);
459 if (S_ISREG(inode->i_mode)) {
460 struct lov_mds_md *lmm;
462 lmm = lustre_msg_buf(req->rq_repmsg, reply_off + 1);
463 lmm->lmm_easize = mds->mds_max_mdsize;
464 rc = mds_fs_get_md(mds, inode, lmm);
469 CERROR("mds_fs_get_md failed: %d\n", rc);
472 body->valid |= OBD_MD_FLEASIZE;
473 } else if (S_ISLNK(inode->i_mode) && reqbody->valid & OBD_MD_LINKNAME) {
474 char *symname = lustre_msg_buf(req->rq_repmsg, reply_off + 1);
475 int len = req->rq_repmsg->buflens[reply_off + 1];
477 rc = inode->i_op->readlink(dentry, symname, len);
479 CERROR("readlink failed: %d\n", rc);
482 CDEBUG(D_INODE, "read symlink dest %s\n", symname);
484 body->valid |= OBD_MD_LINKNAME;
489 static int mds_getattr_name(int offset, struct ptlrpc_request *req)
491 struct mds_obd *mds = mds_req2mds(req);
492 struct obd_device *obd = req->rq_export->exp_obd;
493 struct obd_run_ctxt saved;
494 struct mds_body *body;
495 struct dentry *de = NULL, *dchild = NULL;
497 struct lustre_handle lockh;
499 int namelen, flags, lock_mode, rc = 0;
500 __u64 res_id[3] = {0, 0, 0};
503 LASSERT(!strcmp(req->rq_export->exp_obd->obd_type->typ_name, "mds"));
505 if (req->rq_reqmsg->bufcount <= offset + 1) {
507 GOTO(out_pre_de, rc = -EINVAL);
510 body = lustre_msg_buf(req->rq_reqmsg, offset);
511 name = lustre_msg_buf(req->rq_reqmsg, offset + 1);
512 namelen = req->rq_reqmsg->buflens[offset + 1];
513 /* requests were at offset 2, replies go back at 1 */
517 push_ctxt(&saved, &mds->mds_ctxt);
518 de = mds_fid2dentry(mds, &body->fid1, NULL);
521 GOTO(out_pre_de, rc = -ESTALE);
525 CDEBUG(D_INODE, "parent ino %ld, name %*s\n", dir->i_ino,namelen,name);
527 lock_mode = (req->rq_reqmsg->opc == MDS_REINT) ? LCK_CW : LCK_PW;
528 res_id[0] = dir->i_ino;
530 rc = ldlm_lock_match(obd->obd_namespace, res_id, LDLM_PLAIN,
531 NULL, 0, lock_mode, &lockh);
533 LDLM_DEBUG_NOLOCK("enqueue res "LPU64, res_id[0]);
534 rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace, NULL,
535 res_id, LDLM_PLAIN, NULL, 0, lock_mode,
536 &flags, ldlm_completion_ast,
537 mds_blocking_ast, NULL, 0, &lockh);
538 if (rc != ELDLM_OK) {
539 CERROR("lock enqueue: err: %d\n", rc);
540 GOTO(out_create_de, rc = -EIO);
543 ldlm_lock_dump((void *)(unsigned long)lockh.addr);
546 dchild = lookup_one_len(name, de, namelen - 1);
547 if (IS_ERR(dchild)) {
548 CDEBUG(D_INODE, "child lookup error %ld\n", PTR_ERR(dchild));
551 GOTO(out_create_dchild, rc = -ESTALE);
554 rc = mds_getattr_internal(mds, dchild, req, body, offset);
560 ldlm_lock_decref(&lockh, lock_mode);
569 static int mds_getattr(int offset, struct ptlrpc_request *req)
571 struct mds_obd *mds = mds_req2mds(req);
572 struct obd_run_ctxt saved;
575 struct mds_body *body;
576 int rc = 0, size[2] = {sizeof(*body)}, bufcount = 1;
579 body = lustre_msg_buf(req->rq_reqmsg, offset);
580 push_ctxt(&saved, &mds->mds_ctxt);
581 de = mds_fid2dentry(mds, &body->fid1, NULL);
583 req->rq_status = -ENOENT;
585 GOTO(out_pop, PTR_ERR(de));
589 if (S_ISREG(body->fid1.f_type)) {
591 size[1] = mds->mds_max_mdsize;
592 } else if (body->valid & OBD_MD_LINKNAME) {
594 size[1] = inode->i_size + 1;
597 if (OBD_FAIL_CHECK(OBD_FAIL_MDS_GETATTR_PACK)) {
598 CERROR("failed GETATTR_PACK test\n");
599 req->rq_status = -ENOMEM;
600 GOTO(out, rc = -ENOMEM);
603 rc = lustre_pack_msg(bufcount, size, NULL, &req->rq_replen,
606 CERROR("out of memory or FAIL_MDS_GETATTR_PACK\n");
611 req->rq_status = mds_getattr_internal(mds, de, req, body, 0);
620 static int mds_statfs(struct ptlrpc_request *req)
622 struct mds_obd *mds = mds_req2mds(req);
623 struct obd_statfs *osfs;
625 int rc, size = sizeof(*osfs);
628 rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen,
630 if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_STATFS_PACK)) {
631 CERROR("mds: statfs lustre_pack_msg failed: rc = %d\n", rc);
635 rc = vfs_statfs(mds->mds_sb, &sfs);
637 CERROR("mds: statfs failed: rc %d\n", rc);
640 osfs = lustre_msg_buf(req->rq_repmsg, 0);
641 memset(osfs, 0, size);
642 statfs_pack(osfs, &sfs);
643 obd_statfs_pack(osfs, osfs);
650 static int mds_open(struct ptlrpc_request *req)
653 struct mds_body *body;
655 struct vfsmount *mnt;
656 struct mds_obd *mds = mds_req2mds(req);
657 struct mds_export_data *med;
659 struct list_head *tmp;
660 struct mds_file_data *mfd;
661 int rc, size = sizeof(*body);
664 rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
665 if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_OPEN_PACK)) {
666 CERROR("mds: out of memory\n");
667 req->rq_status = -ENOMEM;
671 body = lustre_msg_buf(req->rq_reqmsg, 0);
673 /* was this animal open already? */
674 /* XXX we should only check on re-open, or do a refcount... */
675 med = &req->rq_export->exp_mds_data;
676 list_for_each(tmp, &med->med_open_head) {
677 struct mds_file_data *fd;
678 fd = list_entry(tmp, struct mds_file_data, mfd_list);
679 if (body->extra == fd->mfd_clientfd &&
680 body->fid1.id == fd->mfd_file->f_dentry->d_inode->i_ino) {
681 CERROR("Re opening "LPD64"\n", body->fid1.id);
686 OBD_ALLOC(mfd, sizeof(*mfd));
688 CERROR("mds: out of memory\n");
689 req->rq_status = -ENOMEM;
693 de = mds_fid2dentry(mds, &body->fid1, &mnt);
695 req->rq_status = -ENOENT;
699 /* check if this inode has seen a delayed object creation */
700 if (req->rq_reqmsg->bufcount > 1) {
702 struct lov_mds_md *lmm;
703 struct inode *inode = de->d_inode;
706 lmm = lustre_msg_buf(req->rq_reqmsg, 1);
708 handle = mds_fs_start(mds, de->d_inode, MDS_FSOP_SETATTR);
710 req->rq_status = -ENOMEM;
714 /* XXX error handling */
715 rc = mds_fs_set_md(mds, inode, handle, lmm);
717 struct obd_run_ctxt saved;
718 push_ctxt(&saved, &mds->mds_ctxt);
719 rc = mds_update_last_rcvd(mds, handle, req);
725 /* FIXME: need to return last_rcvd, last_committed */
727 /* FIXME: keep rc intact */
728 rc = mds_fs_commit(mds, de->d_inode, handle);
736 file = dentry_open(de, mnt, flags & ~O_DIRECT);
737 if (!file || IS_ERR(file)) {
738 req->rq_status = -EINVAL;
739 OBD_FREE(mfd, sizeof(*mfd));
743 file->private_data = mfd;
744 mfd->mfd_file = file;
745 mfd->mfd_clientfd = body->extra;
746 list_add(&mfd->mfd_list, &med->med_open_head);
748 body = lustre_msg_buf(req->rq_repmsg, 0);
749 /* FIXME: need to have cookies involved here */
750 body->extra = (__u64) (unsigned long)file;
754 static int mds_close(struct ptlrpc_request *req)
757 struct mds_body *body;
759 struct mds_obd *mds = mds_req2mds(req);
760 struct vfsmount *mnt;
761 struct mds_file_data *mfd;
765 rc = lustre_pack_msg(0, NULL, NULL, &req->rq_replen, &req->rq_repmsg);
766 if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_CLOSE_PACK)) {
767 CERROR("mds: out of memory\n");
768 req->rq_status = -ENOMEM;
772 body = lustre_msg_buf(req->rq_reqmsg, 0);
773 de = mds_fid2dentry(mds, &body->fid1, &mnt);
775 req->rq_status = -ENOENT;
779 /* FIXME: need to have cookies involved here */
780 file = (struct file *)(unsigned long)body->extra;
783 mfd = (struct mds_file_data *)file->private_data;
784 list_del(&mfd->mfd_list);
785 OBD_FREE(mfd, sizeof(*mfd));
787 req->rq_status = filp_close(file, 0);
794 static int mds_readpage(struct ptlrpc_request *req)
796 struct mds_obd *mds = mds_req2mds(req);
797 struct vfsmount *mnt;
800 struct mds_body *body, *repbody;
801 struct obd_run_ctxt saved;
802 int rc, size = sizeof(*body);
805 rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
806 if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_READPAGE_PACK)) {
807 CERROR("mds: out of memory\n");
808 GOTO(out, rc = -ENOMEM);
811 body = lustre_msg_buf(req->rq_reqmsg, 0);
812 push_ctxt(&saved, &mds->mds_ctxt);
813 de = mds_fid2dentry(mds, &body->fid1, &mnt);
815 GOTO(out_pop, rc = PTR_ERR(de));
817 CDEBUG(D_INODE, "ino %ld\n", de->d_inode->i_ino);
819 file = dentry_open(de, mnt, O_RDONLY | O_LARGEFILE);
820 /* note: in case of an error, dentry_open puts dentry */
822 GOTO(out_pop, rc = PTR_ERR(file));
824 repbody = lustre_msg_buf(req->rq_repmsg, 0);
825 repbody->size = file->f_dentry->d_inode->i_size;
826 repbody->valid = OBD_MD_FLSIZE;
828 /* to make this asynchronous make sure that the handling function
829 doesn't send a reply when this function completes. Instead a
830 callback function would send the reply */
831 /* note: in case of an error, dentry_open puts dentry */
832 rc = mds_sendpage(req, file, body->size);
842 int mds_reint(int offset, struct ptlrpc_request *req)
845 struct mds_update_record rec;
847 rc = mds_update_unpack(req, offset, &rec);
848 if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_UNPACK)) {
849 CERROR("invalid record\n");
850 req->rq_status = -EINVAL;
853 /* rc will be used to interrupt a for loop over multiple records */
854 rc = mds_reint_rec(&rec, offset, req);
858 int mds_handle(struct ptlrpc_request *req)
863 rc = lustre_unpack_msg(req->rq_reqmsg, req->rq_reqlen);
864 if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_HANDLE_UNPACK)) {
865 CERROR("lustre_mds: Invalid request\n");
869 if (req->rq_reqmsg->opc != MDS_CONNECT && req->rq_export == NULL)
870 GOTO(out, rc = -ENOTCONN);
872 if (strcmp(req->rq_obd->obd_type->typ_name, "mds") != 0)
873 GOTO(out, rc = -EINVAL);
875 switch (req->rq_reqmsg->opc) {
877 CDEBUG(D_INODE, "connect\n");
878 OBD_FAIL_RETURN(OBD_FAIL_MDS_CONNECT_NET, 0);
879 rc = target_handle_connect(req);
883 CDEBUG(D_INODE, "disconnect\n");
884 OBD_FAIL_RETURN(OBD_FAIL_MDS_DISCONNECT_NET, 0);
885 rc = target_handle_disconnect(req);
889 CDEBUG(D_INODE, "getstatus\n");
890 OBD_FAIL_RETURN(OBD_FAIL_MDS_GETSTATUS_NET, 0);
891 rc = mds_getstatus(req);
895 CDEBUG(D_INODE, "getlovinfo\n");
896 rc = mds_getlovinfo(req);
900 CDEBUG(D_INODE, "getattr\n");
901 OBD_FAIL_RETURN(OBD_FAIL_MDS_GETATTR_NET, 0);
902 rc = mds_getattr(0, req);
906 CDEBUG(D_INODE, "statfs\n");
907 OBD_FAIL_RETURN(OBD_FAIL_MDS_STATFS_NET, 0);
908 rc = mds_statfs(req);
912 CDEBUG(D_INODE, "readpage\n");
913 OBD_FAIL_RETURN(OBD_FAIL_MDS_READPAGE_NET, 0);
914 rc = mds_readpage(req);
916 if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE))
921 int size = sizeof(struct mds_body);
922 CDEBUG(D_INODE, "reint\n");
923 OBD_FAIL_RETURN(OBD_FAIL_MDS_REINT_NET, 0);
925 rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen,
931 rc = mds_reint(0, req);
932 OBD_FAIL_RETURN(OBD_FAIL_MDS_REINT_NET_REP, 0);
937 CDEBUG(D_INODE, "open\n");
938 OBD_FAIL_RETURN(OBD_FAIL_MDS_OPEN_NET, 0);
943 CDEBUG(D_INODE, "close\n");
944 OBD_FAIL_RETURN(OBD_FAIL_MDS_CLOSE_NET, 0);
949 CDEBUG(D_INODE, "enqueue\n");
950 OBD_FAIL_RETURN(OBD_FAIL_LDLM_ENQUEUE, 0);
951 rc = ldlm_handle_enqueue(req);
957 CDEBUG(D_INODE, "convert\n");
958 OBD_FAIL_RETURN(OBD_FAIL_LDLM_CONVERT, 0);
959 rc = ldlm_handle_convert(req);
965 CDEBUG(D_INODE, "cancel\n");
966 OBD_FAIL_RETURN(OBD_FAIL_LDLM_CANCEL, 0);
967 rc = ldlm_handle_cancel(req);
971 case LDLM_BL_CALLBACK:
972 case LDLM_CP_CALLBACK:
973 CDEBUG(D_INODE, "callback\n");
974 CERROR("callbacks should not happen on MDS\n");
976 OBD_FAIL_RETURN(OBD_FAIL_LDLM_BL_CALLBACK, 0);
979 rc = ptlrpc_error(req->rq_svc, req);
986 struct mds_export_data *med = &req->rq_export->exp_mds_data;
987 struct mds_obd *mds = mds_req2mds(req);
989 req->rq_repmsg->last_xid =
990 HTON__u64(le64_to_cpu(med->med_mcd->mcd_last_xid));
991 req->rq_repmsg->last_committed =
992 HTON__u64(mds->mds_last_committed);
993 CDEBUG(D_INFO, "last_rcvd ~%Lu, last_committed %Lu, xid %d\n",
994 (unsigned long long)mds->mds_last_rcvd,
995 (unsigned long long)mds->mds_last_committed,
996 cpu_to_le32(req->rq_xid));
1000 CERROR("mds: processing error %d\n", rc);
1001 ptlrpc_error(req->rq_svc, req);
1003 CDEBUG(D_NET, "sending reply\n");
1004 ptlrpc_reply(req->rq_svc, req);
1009 /* Update the server data on disk. This stores the new mount_count and
1010 * also the last_rcvd value to disk. If we don't have a clean shutdown,
1011 * then the server last_rcvd value may be less than that of the clients.
1012 * This will alert us that we may need to do client recovery.
1014 * Assumes we are already in the server filesystem context.
1016 * Also assumes for mds_last_rcvd that we are not modifying it (no locking).
1019 int mds_update_server_data(struct mds_obd *mds)
1021 struct mds_server_data *msd = mds->mds_server_data;
1022 struct file *filp = mds->mds_rcvd_filp;
1026 msd->msd_last_rcvd = cpu_to_le64(mds->mds_last_rcvd);
1027 msd->msd_mount_count = cpu_to_le64(mds->mds_mount_count);
1029 CDEBUG(D_SUPER, "MDS mount_count is %Lu, last_rcvd is %Lu\n",
1030 (unsigned long long)mds->mds_mount_count,
1031 (unsigned long long)mds->mds_last_rcvd);
1032 rc = lustre_fwrite(filp, (char *)msd, sizeof(*msd), &off);
1033 if (rc != sizeof(*msd)) {
1034 CERROR("error writing MDS server data: rc = %d\n", rc);
1039 rc = fsync_dev(filp->f_dentry->d_inode->i_rdev);
1041 CERROR("error flushing MDS server data: rc = %d\n", rc);
1046 /* Do recovery actions for the MDS */
1047 static int mds_recover(struct obd_device *obddev)
1049 struct mds_obd *mds = &obddev->u.mds;
1050 struct obd_run_ctxt saved;
1053 /* This happens at the end when recovery is complete */
1054 ++mds->mds_mount_count;
1055 push_ctxt(&saved, &mds->mds_ctxt);
1056 rc = mds_update_server_data(mds);
1062 #define MDS_NUM_THREADS 8
1063 /* mount the file system (secretly) */
1064 static int mds_setup(struct obd_device *obddev, obd_count len, void *buf)
1067 struct obd_ioctl_data* data = buf;
1068 struct mds_obd *mds = &obddev->u.mds;
1069 struct vfsmount *mnt;
1074 #ifdef CONFIG_DEV_RDONLY
1075 dev_clear_rdonly(2);
1077 if (!data->ioc_inlbuf1 || !data->ioc_inlbuf2)
1078 GOTO(err_dec, rc = -EINVAL);
1080 mds->mds_fstype = strdup(data->ioc_inlbuf2);
1082 mnt = do_kern_mount(mds->mds_fstype, 0, data->ioc_inlbuf1, NULL);
1085 CERROR("do_kern_mount failed: rc = %d\n", rc);
1086 GOTO(err_kfree, rc);
1089 mds->mds_sb = mnt->mnt_root->d_inode->i_sb;
1091 GOTO(err_put, rc = -ENODEV);
1093 spin_lock_init(&mds->mds_last_lock);
1094 mds->mds_max_mdsize = sizeof(struct lov_mds_md);
1095 rc = mds_fs_setup(obddev, mnt);
1097 CERROR("MDS filesystem method init failed: rc = %d\n", rc);
1101 mds->mds_service = ptlrpc_init_svc(MDS_NEVENTS, MDS_NBUFS,
1102 MDS_BUFSIZE, MDS_MAXREQSIZE,
1103 MDS_REQUEST_PORTAL, MDC_REPLY_PORTAL,
1104 "self", mds_handle, "mds");
1105 if (!mds->mds_service) {
1106 CERROR("failed to start service\n");
1107 GOTO(err_fs, rc = -EINVAL);
1110 obddev->obd_namespace =
1111 ldlm_namespace_new("mds_server", LDLM_NAMESPACE_SERVER);
1112 if (obddev->obd_namespace == NULL) {
1113 mds_cleanup(obddev);
1114 GOTO(err_svc, rc = -ENOMEM);
1117 for (i = 0; i < MDS_NUM_THREADS; i++) {
1119 sprintf(name, "lustre_MDS_%02d", i);
1120 rc = ptlrpc_start_thread(obddev, mds->mds_service, name);
1122 CERROR("cannot start MDS thread #%d: rc %d\n", i, rc);
1123 GOTO(err_thread, rc);
1127 rc = mds_recover(obddev);
1129 GOTO(err_thread, rc);
1131 mds_destroy_export = mds_client_free;
1133 ptlrpc_init_client(LDLM_REQUEST_PORTAL, LDLM_REPLY_PORTAL,
1134 "mds_ldlm_client", &obddev->obd_ldlm_client);
1139 ptlrpc_stop_all_threads(mds->mds_service);
1141 ptlrpc_unregister_service(mds->mds_service);
1143 mds_fs_cleanup(obddev);
1146 mntput(mds->mds_vfsmnt);
1150 kfree(mds->mds_fstype);
1156 static int mds_cleanup(struct obd_device *obddev)
1158 struct super_block *sb;
1159 struct mds_obd *mds = &obddev->u.mds;
1160 struct obd_run_ctxt saved;
1163 ptlrpc_stop_all_threads(mds->mds_service);
1164 ptlrpc_unregister_service(mds->mds_service);
1170 push_ctxt(&saved, &mds->mds_ctxt);
1171 mds_update_server_data(mds);
1173 if (mds->mds_rcvd_filp) {
1174 int rc = filp_close(mds->mds_rcvd_filp, 0);
1175 mds->mds_rcvd_filp = NULL;
1178 CERROR("last_rcvd file won't close, rc=%d\n", rc);
1183 mntput(mds->mds_vfsmnt);
1185 kfree(mds->mds_fstype);
1187 ldlm_namespace_free(obddev->obd_namespace);
1190 #ifdef CONFIG_DEV_RDONLY
1191 dev_clear_rdonly(2);
1193 mds_fs_cleanup(obddev);
1199 static int ldlm_intent_policy(struct ldlm_lock *lock, void *req_cookie,
1200 ldlm_mode_t mode, void *data)
1202 struct ptlrpc_request *req = req_cookie;
1209 if (req->rq_reqmsg->bufcount > 1) {
1210 /* an intent needs to be considered */
1211 struct ldlm_intent *it = lustre_msg_buf(req->rq_reqmsg, 1);
1212 struct mds_obd *mds= &req->rq_export->exp_obd->u.mds;
1213 struct mds_body *mds_rep;
1214 struct ldlm_reply *rep;
1215 __u64 new_resid[3] = {0, 0, 0}, old_res;
1216 int rc, size[3] = {sizeof(struct ldlm_reply),
1217 sizeof(struct mds_body),
1218 mds->mds_max_mdsize};
1220 it->opc = NTOH__u64(it->opc);
1222 LDLM_DEBUG(lock, "intent policy, opc: %s",
1223 ldlm_it2str(it->opc));
1225 rc = lustre_pack_msg(3, size, NULL, &req->rq_replen,
1228 rc = req->rq_status = -ENOMEM;
1232 rep = lustre_msg_buf(req->rq_repmsg, 0);
1233 rep->lock_policy_res1 = 1;
1235 /* execute policy */
1236 switch ((long)it->opc) {
1237 case IT_CREAT|IT_OPEN:
1238 rc = mds_reint(2, req);
1239 if (rc || (req->rq_status != 0 &&
1240 req->rq_status != -EEXIST)) {
1241 rep->lock_policy_res2 = req->rq_status;
1242 RETURN(ELDLM_LOCK_ABORTED);
1253 rc = mds_reint(2, req);
1254 if (rc || (req->rq_status != 0 &&
1255 req->rq_status != -EISDIR &&
1256 req->rq_status != -ENOTDIR)) {
1257 rep->lock_policy_res2 = req->rq_status;
1258 RETURN(ELDLM_LOCK_ABORTED);
1269 rc = mds_getattr_name(2, req);
1270 /* FIXME: we need to sit down and decide on who should
1271 * set req->rq_status, who should return negative and
1272 * positive return values, and what they all mean. */
1273 if (rc || req->rq_status != 0) {
1274 rep->lock_policy_res2 = req->rq_status;
1275 RETURN(ELDLM_LOCK_ABORTED);
1278 case IT_READDIR|IT_OPEN:
1282 CERROR("Unhandled intent\n");
1286 /* We don't bother returning a lock to the client for a file
1287 * or directory we are removing.
1289 * As for link and rename, there is no reason for the client
1290 * to get a lock on the target at this point. If they are
1291 * going to modify the file/directory later they will get a
1292 * lock at that time.
1294 if (it->opc & (IT_UNLINK | IT_RMDIR | IT_LINK | IT_LINK2 |
1295 IT_RENAME | IT_RENAME2))
1296 RETURN(ELDLM_LOCK_ABORTED);
1298 rep->lock_policy_res2 = req->rq_status;
1299 mds_rep = lustre_msg_buf(req->rq_repmsg, 1);
1301 /* If the client is about to open a file that doesn't have an MD
1302 * stripe record, it's going to need a write lock. */
1303 if (it->opc & IT_OPEN) {
1304 struct lov_mds_md *lmm =
1305 lustre_msg_buf(req->rq_repmsg, 2);
1306 if (lmm->lmm_easize == 0) {
1307 LDLM_DEBUG(lock, "open with no EA; returning PW"
1309 lock->l_req_mode = LCK_PW;
1313 /* Give the client a lock on the child object, instead of the
1314 * parent that it requested. */
1315 new_resid[0] = NTOH__u32(mds_rep->ino);
1316 if (new_resid[0] == 0)
1318 old_res = lock->l_resource->lr_name[0];
1320 ldlm_lock_change_resource(lock, new_resid);
1321 if (lock->l_resource == NULL) {
1325 LDLM_DEBUG(lock, "intent policy, old res %ld",
1327 RETURN(ELDLM_LOCK_CHANGED);
1329 int size = sizeof(struct ldlm_reply);
1330 rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen,
1341 extern int mds_iocontrol(long cmd, struct lustre_handle *conn,
1342 int len, void *karg, void *uarg);
1344 /* use obd ops to offer management infrastructure */
1345 static struct obd_ops mds_obd_ops = {
1346 o_connect: mds_connect,
1347 o_disconnect: mds_disconnect,
1349 o_cleanup: mds_cleanup,
1350 o_iocontrol: mds_iocontrol
1353 static int __init mds_init(void)
1355 class_register_type(&mds_obd_ops, LUSTRE_MDS_NAME);
1356 ldlm_register_intent(ldlm_intent_policy);
1360 static void __exit mds_exit(void)
1362 ldlm_unregister_intent();
1363 class_unregister_type(LUSTRE_MDS_NAME);
1366 MODULE_AUTHOR("Cluster File Systems <info@clusterfs.com>");
1367 MODULE_DESCRIPTION("Lustre Metadata Server (MDS) v0.01");
1368 MODULE_LICENSE("GPL");
1370 module_init(mds_init);
1371 module_exit(mds_exit);