lustre/mds/mds_fs.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  mds/mds_fs.c
   5  *  Lustre Metadata Server (MDS) filesystem interface code
   6  *
   7  *  Copyright (C) 2002, 2003 Cluster File Systems, Inc.
   8  *   Author: Andreas Dilger <adilger@clusterfs.com>
   9  *
  10  *   This file is part of Lustre, http://www.lustre.org.
  11  *
  12  *   Lustre is free software; you can redistribute it and/or
  13  *   modify it under the terms of version 2 of the GNU General Public
  14  *   License as published by the Free Software Foundation.
  15  *
  16  *   Lustre is distributed in the hope that it will be useful,
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  *   GNU General Public License for more details.
  20  *
  21  *   You should have received a copy of the GNU General Public License
  22  *   along with Lustre; if not, write to the Free Software
  23  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24  */
  25
  26 #ifndef EXPORT_SYMTAB
  27 # define EXPORT_SYMTAB
  28 #endif
  29 #define DEBUG_SUBSYSTEM S_MDS
  30
  31 #include <linux/module.h>
  32 #include <linux/kmod.h>
  33 #include <linux/version.h>
  34 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0))
  35 #include <linux/mount.h>
  36 #endif
  37 #include <linux/lustre_mds.h>
  38 #include <linux/obd_class.h>
  39 #include <linux/obd_support.h>
  40 #include <linux/lustre_lib.h>
  41 #include <linux/lustre_fsfilt.h>
  42 #include <libcfs/list.h>
  43
  44 #include <linux/lustre_smfs.h>
  45 #include "mds_internal.h"
  46
  47 /* This limit is arbitrary, but for now we fit it in 1 page (32k clients) */
  48 #define MDS_MAX_CLIENTS (PAGE_SIZE * 8)
  49
  50 #define LAST_RCVD "last_rcvd"
  51 #define LOV_OBJID "lov_objid"
  52 #define LAST_FID  "last_fid"
  53 #define VIRT_FID  "virt_fid"
  54
  55 /* Add client data to the MDS.  We use a bitmap to locate a free space
  56  * in the last_rcvd file if cl_off is -1 (i.e. a new client).
  57  * Otherwise, we have just read the data from the last_rcvd file and
  58  * we know its offset.
  59  */
  60 int mds_client_add(struct obd_device *obd, struct mds_obd *mds,
  61                    struct mds_export_data *med, int cl_idx)
  62 {
  63         unsigned long *bitmap = mds->mds_client_bitmap;
  64         int new_client = (cl_idx == -1);
  65         ENTRY;
  66
  67         LASSERT(bitmap != NULL);
  68
  69         /* XXX if mcd_uuid were a real obd_uuid, I could use obd_uuid_equals */
  70         if (!strcmp((char *)med->med_mcd->mcd_uuid, (char *)obd->obd_uuid.uuid))
  71                 RETURN(0);
  72
  73         /* the bitmap operations can handle cl_idx > sizeof(long) * 8, so
  74          * there's no need for extra complication here
  75          */
  76         if (new_client) {
  77                 cl_idx = find_first_zero_bit(bitmap, MDS_MAX_CLIENTS);
  78         repeat:
  79                 if (cl_idx >= MDS_MAX_CLIENTS) {
  80                         CERROR("no room for clients - fix MDS_MAX_CLIENTS\n");
  81                         return -ENOMEM;
  82                 }
  83                 if (test_and_set_bit(cl_idx, bitmap)) {
  84                         cl_idx = find_next_zero_bit(bitmap, MDS_MAX_CLIENTS,
  85                                                     cl_idx);
  86                         goto repeat;
  87                 }
  88         } else {
  89                 if (test_and_set_bit(cl_idx, bitmap)) {
  90                         CERROR("MDS client %d: bit already set in bitmap!!\n",
  91                                cl_idx);
  92                         LBUG();
  93                 }
  94         }
  95
  96         CDEBUG(D_INFO, "client at idx %d with UUID '%s' added\n",
  97                cl_idx, med->med_mcd->mcd_uuid);
  98
  99         med->med_idx = cl_idx;
 100         med->med_off = le32_to_cpu(mds->mds_server_data->msd_client_start) +
 101                 (cl_idx * le16_to_cpu(mds->mds_server_data->msd_client_size));
 102
 103         if (new_client) {
 104                 struct file *file = mds->mds_rcvd_filp;
 105                 struct lvfs_run_ctxt saved;
 106                 loff_t off = med->med_off;
 107                 int rc;
 108
 109                 push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 110                 rc = fsfilt_write_record(obd, file, med->med_mcd,
 111                                          sizeof(*med->med_mcd), &off, 1);
 112                 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 113
 114                 if (rc)
 115                         return rc;
 116                 CDEBUG(D_INFO, "wrote client mcd at idx %u off %llu (len %u)\n",
 117                        med->med_idx, med->med_off,
 118                        (unsigned int)sizeof(*med->med_mcd));
 119         }
 120         return 0;
 121 }
 122
 123 int mds_client_free(struct obd_export *exp, int clear_client)
 124 {
 125         struct mds_export_data *med = &exp->exp_mds_data;
 126         struct mds_obd *mds = &exp->exp_obd->u.mds;
 127         unsigned long *bitmap = mds->mds_client_bitmap;
 128         struct obd_device *obd = exp->exp_obd;
 129         struct mds_client_data zero_mcd;
 130         struct lvfs_run_ctxt saved;
 131         int rc;
 132
 133         if (!med->med_mcd)
 134                 RETURN(0);
 135
 136         /* XXX if mcd_uuid were a real obd_uuid, I could use obd_uuid_equals */
 137         if (!strcmp((char *)med->med_mcd->mcd_uuid, (char *)obd->obd_uuid.uuid))
 138                 GOTO(free_and_out, 0);
 139
 140         CDEBUG(D_INFO, "freeing client at idx %u (%lld)with UUID '%s'\n",
 141                med->med_idx, med->med_off, med->med_mcd->mcd_uuid);
 142
 143         LASSERT(bitmap);
 144
 145         /* Clear the bit _after_ zeroing out the client so we don't
 146            race with mds_client_add and zero out new clients.*/
 147         if (!test_bit(med->med_idx, bitmap)) {
 148                 CERROR("MDS client %u: bit already clear in bitmap!!\n",
 149                        med->med_idx);
 150                 LBUG();
 151         }
 152
 153         if (clear_client) {
 154                 memset(&zero_mcd, 0, sizeof zero_mcd);
 155                 push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 156                 rc = fsfilt_write_record(obd, mds->mds_rcvd_filp, &zero_mcd,
 157                                          sizeof(zero_mcd), &med->med_off, 1);
 158                 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 159
 160                 CDEBUG(rc == 0 ? D_INFO : D_ERROR,
 161                        "zeroing out client %s idx %u in %s rc %d\n",
 162                        med->med_mcd->mcd_uuid, med->med_idx, LAST_RCVD, rc);
 163         }
 164
 165         if (!test_and_clear_bit(med->med_idx, bitmap)) {
 166                 CERROR("MDS client %u: bit already clear in bitmap!!\n",
 167                        med->med_idx);
 168                 LBUG();
 169         }
 170
 171
 172         /* Make sure the server's last_transno is up to date. Do this
 173          * after the client is freed so we know all the client's
 174          * transactions have been committed. */
 175         mds_update_server_data(exp->exp_obd, 1);
 176
 177 free_and_out:
 178         OBD_FREE(med->med_mcd, sizeof(*med->med_mcd));
 179         med->med_mcd = NULL;
 180         return 0;
 181 }
 182
 183 static int mds_server_free_data(struct mds_obd *mds)
 184 {
 185         OBD_FREE(mds->mds_client_bitmap, MDS_MAX_CLIENTS / 8);
 186         OBD_FREE(mds->mds_server_data, sizeof(*mds->mds_server_data));
 187         mds->mds_server_data = NULL;
 188
 189         return 0;
 190 }
 191
 192 static int mds_read_last_fid(struct obd_device *obd, struct file *file)
 193 {
 194         int rc = 0;
 195         loff_t off = 0;
 196         struct mds_obd *mds = &obd->u.mds;
 197         unsigned long last_fid_size = file->f_dentry->d_inode->i_size;
 198         ENTRY;
 199
 200         if (last_fid_size == 0) {
 201                 CWARN("%s: initializing new %s\n", obd->obd_name,
 202                       file->f_dentry->d_name.name);
 203
 204                 /*
 205                  * as fid is used for forming res_id for locking, it should not
 206                  * be zero. This will keep us out of lots possible problems,
 207                  * asserts, etc.
 208                  */
 209                 mds_set_last_fid(obd, 0);
 210         } else {
 211                 __u64 lastfid;
 212
 213                 rc = fsfilt_read_record(obd, file, &lastfid,
 214                                         sizeof(lastfid), &off);
 215                 if (rc) {
 216                         CERROR("error reading MDS %s: rc = %d\n",
 217                                file->f_dentry->d_name.name, rc);
 218                         RETURN(rc);
 219                 }
 220
 221                 /*
 222                  * make sure, that fid is up-to-date.
 223                  */
 224                 mds_set_last_fid(obd, lastfid);
 225         }
 226
 227         CDEBUG(D_INODE, "%s: server last_fid: "LPU64"\n",
 228                obd->obd_name, mds->mds_last_fid);
 229
 230         rc = mds_update_last_fid(obd, NULL, 1);
 231         RETURN(rc);
 232 }
 233
 234 static int mds_read_last_rcvd(struct obd_device *obd, struct file *file)
 235 {
 236         unsigned long last_rcvd_size = file->f_dentry->d_inode->i_size;
 237         struct mds_obd *mds = &obd->u.mds;
 238         struct mds_server_data *msd = NULL;
 239         struct mds_client_data *mcd = NULL;
 240         loff_t off = 0;
 241         __u64 mount_count;
 242         int cl_idx, rc = 0;
 243         ENTRY;
 244
 245         /* ensure padding in the struct is the correct size */
 246         LASSERT(offsetof(struct mds_server_data, msd_padding) +
 247                 sizeof(msd->msd_padding) == MDS_LR_SERVER_SIZE);
 248         LASSERT(offsetof(struct mds_client_data, mcd_padding) +
 249                 sizeof(mcd->mcd_padding) == MDS_LR_CLIENT_SIZE);
 250
 251         OBD_ALLOC_WAIT(msd, sizeof(*msd));
 252         if (!msd)
 253                 RETURN(-ENOMEM);
 254
 255         OBD_ALLOC_WAIT(mds->mds_client_bitmap, MDS_MAX_CLIENTS / 8);
 256         if (!mds->mds_client_bitmap) {
 257                 OBD_FREE(msd, sizeof(*msd));
 258                 RETURN(-ENOMEM);
 259         }
 260
 261         mds->mds_server_data = msd;
 262
 263         if (last_rcvd_size == 0) {
 264                 CWARN("%s: initializing new %s\n", obd->obd_name,
 265                       file->f_dentry->d_name.name);
 266
 267                 memcpy(msd->msd_uuid, obd->obd_uuid.uuid,sizeof(msd->msd_uuid));
 268                 msd->msd_last_transno = 0;
 269                 mount_count = msd->msd_mount_count = 0;
 270                 msd->msd_server_size = cpu_to_le32(MDS_LR_SERVER_SIZE);
 271                 msd->msd_client_start = cpu_to_le32(MDS_LR_CLIENT_START);
 272                 msd->msd_client_size = cpu_to_le16(MDS_LR_CLIENT_SIZE);
 273                 msd->msd_feature_rocompat = cpu_to_le32(MDS_ROCOMPAT_LOVOBJID);
 274         } else {
 275                 rc = fsfilt_read_record(obd, file, msd, sizeof(*msd), &off);
 276                 if (rc) {
 277                         CERROR("error reading MDS %s: rc = %d\n",
 278                                file->f_dentry->d_name.name, rc);
 279                         GOTO(err_msd, rc);
 280                 }
 281                 if (strcmp((char *)msd->msd_uuid, (char *)obd->obd_uuid.uuid)) {
 282                         CERROR("OBD UUID %s does not match last_rcvd UUID %s\n",
 283                                obd->obd_uuid.uuid, msd->msd_uuid);
 284                         GOTO(err_msd, rc = -EINVAL);
 285                 }
 286                 mount_count = le64_to_cpu(msd->msd_mount_count);
 287         }
 288         if (msd->msd_feature_incompat & ~cpu_to_le32(MDS_INCOMPAT_SUPP)) {
 289                 CERROR("unsupported incompat feature %x\n",
 290                        le32_to_cpu(msd->msd_feature_incompat) &
 291                        ~MDS_INCOMPAT_SUPP);
 292                 GOTO(err_msd, rc = -EINVAL);
 293         }
 294         /* XXX updating existing b_devel fs only, can be removed in future */
 295         msd->msd_feature_rocompat = cpu_to_le32(MDS_ROCOMPAT_LOVOBJID);
 296         if (msd->msd_feature_rocompat & ~cpu_to_le32(MDS_ROCOMPAT_SUPP)) {
 297                 CERROR("unsupported read-only feature %x\n",
 298                        le32_to_cpu(msd->msd_feature_rocompat) &
 299                        ~MDS_ROCOMPAT_SUPP);
 300                 /* Do something like remount filesystem read-only */
 301                 GOTO(err_msd, rc = -EINVAL);
 302         }
 303
 304         mds->mds_last_transno = le64_to_cpu(msd->msd_last_transno);
 305
 306         CDEBUG(D_INODE, "%s: server last_transno: "LPU64"\n",
 307                obd->obd_name, mds->mds_last_transno);
 308         CDEBUG(D_INODE, "%s: server mount_count: "LPU64"\n",
 309                obd->obd_name, mount_count + 1);
 310         CDEBUG(D_INODE, "%s: server data size: %u\n",
 311                obd->obd_name, le32_to_cpu(msd->msd_server_size));
 312         CDEBUG(D_INODE, "%s: per-client data start: %u\n",
 313                obd->obd_name, le32_to_cpu(msd->msd_client_start));
 314         CDEBUG(D_INODE, "%s: per-client data size: %u\n",
 315                obd->obd_name, le32_to_cpu(msd->msd_client_size));
 316         CDEBUG(D_INODE, "%s: last_rcvd size: %lu\n",
 317                obd->obd_name, last_rcvd_size);
 318         CDEBUG(D_INODE, "%s: last_rcvd clients: %lu\n", obd->obd_name,
 319                last_rcvd_size <= le32_to_cpu(msd->msd_client_start) ? 0 :
 320                (last_rcvd_size - le32_to_cpu(msd->msd_client_start)) /
 321                 le16_to_cpu(msd->msd_client_size));
 322
 323         /* When we do a clean MDS shutdown, we save the last_transno into
 324          * the header.  If we find clients with higher last_transno values
 325          * then those clients may need recovery done. */
 326         for (cl_idx = 0, off = le32_to_cpu(msd->msd_client_start);
 327              off < last_rcvd_size; cl_idx++) {
 328                 __u64 last_transno;
 329                 struct obd_export *exp;
 330                 struct mds_export_data *med;
 331
 332                 if (!mcd) {
 333                         OBD_ALLOC_WAIT(mcd, sizeof(*mcd));
 334                         if (!mcd)
 335                                 GOTO(err_client, rc = -ENOMEM);
 336                 }
 337
 338                 /* Don't assume off is incremented properly by
 339                  * fsfilt_read_record(), in case sizeof(*mcd)
 340                  * isn't the same as msd->msd_client_size.  */
 341                 off = le32_to_cpu(msd->msd_client_start) +
 342                         cl_idx * le16_to_cpu(msd->msd_client_size);
 343                 rc = fsfilt_read_record(obd, file, mcd, sizeof(*mcd), &off);
 344                 if (rc) {
 345                         CERROR("error reading MDS %s idx %d, off %llu: rc %d\n",
 346                                file->f_dentry->d_name.name, cl_idx, off, rc);
 347                         break; /* read error shouldn't cause startup to fail */
 348                 }
 349
 350                 if (mcd->mcd_uuid[0] == '\0') {
 351                         CDEBUG(D_INFO, "skipping zeroed client at offset %d\n",
 352                                cl_idx);
 353                         continue;
 354                 }
 355
 356                 last_transno = le64_to_cpu(mcd->mcd_last_transno) >
 357                                le64_to_cpu(mcd->mcd_last_close_transno) ?
 358                                le64_to_cpu(mcd->mcd_last_transno) :
 359                                le64_to_cpu(mcd->mcd_last_close_transno);
 360
 361                 /* These exports are cleaned up by mds_disconnect(), so they
 362                  * need to be set up like real exports as mds_connect() does.
 363                  */
 364                 CDEBUG(D_HA|D_WARNING,"RCVRNG CLIENT uuid: %s idx: %d lr: "LPU64
 365                        " srv lr: "LPU64" lx: "LPU64"\n", mcd->mcd_uuid, cl_idx,
 366                        last_transno, le64_to_cpu(msd->msd_last_transno),
 367                        mcd->mcd_last_xid);
 368
 369                 exp = class_new_export(obd);
 370                 if (exp == NULL)
 371                         GOTO(err_client, rc = -ENOMEM);
 372
 373                 memcpy(&exp->exp_client_uuid.uuid, mcd->mcd_uuid,
 374                        sizeof exp->exp_client_uuid.uuid);
 375                 med = &exp->exp_mds_data;
 376                 med->med_mcd = mcd;
 377                 mds_client_add(obd, mds, med, cl_idx);
 378                 /* create helper if export init gets more complex */
 379                 INIT_LIST_HEAD(&med->med_open_head);
 380                 spin_lock_init(&med->med_open_lock);
 381
 382                 mcd = NULL;
 383                 exp->exp_connected = 0;
 384                 exp->exp_req_replay_needed = 1;
 385                 obd->obd_recoverable_clients++;
 386                 obd->obd_max_recoverable_clients++;
 387
 388                 /* track clients to separate req replay
 389                  * from lock replay. bug 6063 */
 390                 atomic_inc(&obd->obd_req_replay_clients);
 391                 exp->exp_req_replay_needed = 1;
 392                 atomic_inc(&obd->obd_lock_replay_clients);
 393                 exp->exp_lock_replay_needed = 1;
 394
 395                 class_export_put(exp);
 396
 397                 CDEBUG(D_OTHER, "client at idx %d has last_transno = "LPU64"\n",
 398                        cl_idx, last_transno);
 399
 400                 if (last_transno > mds->mds_last_transno)
 401                        mds->mds_last_transno = last_transno;
 402         }
 403         if (mcd)
 404                 OBD_FREE(mcd, sizeof(*mcd));
 405         obd->obd_last_committed = mds->mds_last_transno;
 406         if (obd->obd_recoverable_clients) {
 407                 CWARN("RECOVERY: service %s, %d recoverable clients, "
 408                       "last_transno "LPU64"\n", obd->obd_name,
 409                       obd->obd_recoverable_clients, mds->mds_last_transno);
 410                 obd->obd_next_recovery_transno = obd->obd_last_committed + 1;
 411                 target_start_recovery_thread(obd, mds_handle);
 412                 obd->obd_recovery_start = LTIME_S(CURRENT_TIME);
 413         }
 414
 415         mds->mds_mount_count = mount_count + 1;
 416         msd->msd_mount_count = cpu_to_le64(mds->mds_mount_count);
 417
 418         /* save it, so mount count and last_transno is current */
 419         rc = mds_update_server_data(obd, 1);
 420         if (rc)
 421                 GOTO(err_client, rc);
 422
 423         RETURN(0);
 424
 425 err_client:
 426         class_disconnect_exports(obd, 0);
 427 err_msd:
 428         mds_server_free_data(mds);
 429         RETURN(rc);
 430 }
 431
 432 static int mds_fs_post_setup(struct obd_device *obd)
 433 {
 434         struct mds_obd *mds = &obd->u.mds;
 435         struct dentry *dentry;
 436         int rc = 0;
 437         ENTRY;
 438
 439         dentry = mds_id2dentry(obd, &mds->mds_rootid, NULL);
 440         if (IS_ERR(dentry)) {
 441                 CERROR("Can't find ROOT, err = %d\n",
 442                        (int)PTR_ERR(dentry));
 443                 RETURN(PTR_ERR(dentry));
 444         }
 445
 446         rc = fsfilt_post_setup(obd, dentry);
 447
 448         l_dput(dentry);
 449         RETURN(rc);
 450 }
 451
 452 /*
 453  * sets up root inode lustre_id. It tries to read it first from root inode and
 454  * if it is not there, new rootid is allocated and saved there.
 455  */
 456 int mds_fs_setup_rootid(struct obd_device *obd)
 457 {
 458         int rc = 0;
 459         void *handle;
 460         struct inode *inode;
 461         struct dentry *dentry;
 462         struct mds_obd *mds = &obd->u.mds;
 463         __u64 fid;
 464         ENTRY;
 465
 466         /* getting root directory and setup its fid. */
 467         dentry = mds_id2dentry(obd, &mds->mds_rootid, NULL);
 468         if (IS_ERR(dentry)) {
 469                 CERROR("Can't find ROOT by "DLID4", err = %d\n",
 470                        OLID4(&mds->mds_rootid), (int)PTR_ERR(dentry));
 471                 RETURN(PTR_ERR(dentry));
 472         }
 473
 474         inode = dentry->d_inode;
 475         LASSERT(dentry->d_inode);
 476
 477         rc = mds_pack_inode2id(obd, &mds->mds_rootid, inode, 1);
 478         if (rc < 0) {
 479                 if (rc != -ENODATA)
 480                         GOTO(out_dentry, rc);
 481         } else {
 482                 /*
 483                  * rootid is filled by mds_read_inode_sid(), so we do not need
 484                  * to allocate it and update. The only thing we need to check is
 485                  * mds_num.
 486                  */
 487                 LASSERT(id_group(&mds->mds_rootid) == mds->mds_num);
 488                 mds_set_last_fid(obd, id_fid(&mds->mds_rootid));
 489                 GOTO(out_dentry, rc);
 490         }
 491
 492         /* allocating new one, as it is not found in root inode. */
 493         handle = fsfilt_start(obd, inode,
 494                               FSFILT_OP_SETATTR, NULL);
 495
 496         if (IS_ERR(handle)) {
 497                 rc = PTR_ERR(handle);
 498                 CERROR("fsfilt_start() failed, rc = %d\n", rc);
 499                 GOTO(out_dentry, rc);
 500         }
 501
 502         fid = mds_alloc_fid(obd);
 503         down(&inode->i_sem);
 504         rc = mds_set_inode_sid(obd, inode, handle, &mds->mds_rootid, fid);
 505         up(&inode->i_sem);
 506
 507         if (rc) {
 508                 CERROR("mds_set_inode_sid() failed, rc = %d\n",
 509                        rc);
 510                 GOTO(out_dentry, rc);
 511         }
 512
 513         rc = fsfilt_commit(obd, mds->mds_sb, inode, handle, 0);
 514         if (rc)
 515                 CERROR("fsfilt_commit() failed, rc = %d\n", rc);
 516
 517         EXIT;
 518 out_dentry:
 519         l_dput(dentry);
 520         if (rc == 0)
 521                 CWARN("%s: rootid: "DLID4"\n", obd->obd_name,
 522                       OLID4(&mds->mds_rootid));
 523         return rc;
 524 }
 525
 526 static int mds_update_virtid_fid(struct obd_device *obd,
 527                                  void *handle, int force_sync)
 528 {
 529         struct mds_obd *mds = &obd->u.mds;
 530         struct file *filp = mds->mds_virtid_filp;
 531         struct lvfs_run_ctxt saved;
 532         loff_t off = 0;
 533         int rc = 0;
 534         ENTRY;
 535
 536         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 537         rc = fsfilt_write_record(obd, filp, &mds->mds_virtid_fid,
 538                                  sizeof(mds->mds_virtid_fid),
 539                                  &off, force_sync);
 540         if (rc) {
 541                 CERROR("error writing MDS virtid_fid #"LPU64
 542                        ", err = %d\n", mds->mds_virtid_fid, rc);
 543         }
 544
 545         CDEBUG(D_SUPER, "wrote virtid fid #"LPU64" at idx "
 546                "%llu: err = %d\n", mds->mds_virtid_fid,
 547                off, rc);
 548         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 549
 550         RETURN(rc);
 551 }
 552
 553 static int mds_read_virtid_fid(struct obd_device *obd,
 554                                struct file *file)
 555 {
 556         int rc = 0;
 557         loff_t off = 0;
 558         struct mds_obd *mds = &obd->u.mds;
 559         unsigned long virtid_fid_size = file->f_dentry->d_inode->i_size;
 560         ENTRY;
 561
 562         if (virtid_fid_size == 0) {
 563                 mds->mds_virtid_fid = mds_alloc_fid(obd);
 564         } else {
 565                 rc = fsfilt_read_record(obd, file, &mds->mds_virtid_fid,
 566                                         sizeof(mds->mds_virtid_fid), &off);
 567                 if (rc) {
 568                         CERROR("error reading MDS %s: rc = %d\n",
 569                                file->f_dentry->d_name.name, rc);
 570                         RETURN(rc);
 571                 }
 572         }
 573         rc = mds_update_virtid_fid(obd, NULL, 1);
 574
 575         RETURN(rc);
 576 }
 577
 578 /*
 579  * initializes lustre_id for virtual id directory, it is needed sometimes, as it
 580  * is possible that it will be the parent for object an operations is going to
 581  * be performed on.
 582  */
 583 int mds_fs_setup_virtid(struct obd_device *obd)
 584 {
 585         int rc = 0;
 586         void *handle;
 587         struct lustre_id sid;
 588         struct mds_obd *mds = &obd->u.mds;
 589         struct inode *inode = mds->mds_id_dir->d_inode;
 590         ENTRY;
 591
 592         handle = fsfilt_start(obd, inode,
 593                               FSFILT_OP_SETATTR, NULL);
 594
 595         if (IS_ERR(handle)) {
 596                 rc = PTR_ERR(handle);
 597                 CERROR("fsfilt_start() failed, rc = %d\n", rc);
 598                 RETURN(rc);
 599         }
 600
 601         id_group(&sid) = mds->mds_num;
 602         id_fid(&sid) = mds->mds_virtid_fid;
 603
 604         id_ino(&sid) = inode->i_ino;
 605         id_gen(&sid) = inode->i_generation;
 606         id_type(&sid) = (S_IFMT & inode->i_mode);
 607
 608         down(&inode->i_sem);
 609         rc = mds_update_inode_sid(obd, inode, handle, &sid);
 610         up(&inode->i_sem);
 611
 612         if (rc) {
 613                 CERROR("mds_update_inode_sid() failed, rc = %d\n",
 614                        rc);
 615                 RETURN(rc);
 616         }
 617
 618         rc = fsfilt_commit(obd, mds->mds_sb, inode, handle, 0);
 619         if (rc) {
 620                 CERROR("fsfilt_commit() failed, rc = %d\n", rc);
 621                 RETURN(rc);
 622         }
 623
 624         RETURN(rc);
 625 }
 626
 627 int mds_fs_setup(struct obd_device *obd, struct vfsmount *mnt)
 628 {
 629         struct mds_obd *mds = &obd->u.mds;
 630         struct lvfs_run_ctxt saved;
 631         struct dentry *dentry;
 632         struct file *file;
 633         int rc;
 634         ENTRY;
 635
 636         rc = cleanup_group_info();
 637         if (rc)
 638                 RETURN(rc);
 639
 640         mds->mds_vfsmnt = mnt;
 641         mds->mds_sb = mnt->mnt_root->d_inode->i_sb;
 642
 643         fsfilt_setup(obd, mds->mds_sb);
 644
 645         OBD_SET_CTXT_MAGIC(&obd->obd_lvfs_ctxt);
 646         obd->obd_lvfs_ctxt.pwdmnt = mnt;
 647         obd->obd_lvfs_ctxt.pwd = mnt->mnt_root;
 648         obd->obd_lvfs_ctxt.fs = get_ds();
 649         obd->obd_lvfs_ctxt.cb_ops = mds_lvfs_ops;
 650
 651         /* setup the directory tree */
 652         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 653         dentry = simple_mkdir(current->fs->pwd, "ROOT", 0755, 0);
 654         if (IS_ERR(dentry)) {
 655                 rc = PTR_ERR(dentry);
 656                 CERROR("cannot create ROOT directory: rc = %d\n", rc);
 657                 GOTO(err_pop, rc);
 658         }
 659
 660         mdc_pack_id(&mds->mds_rootid, dentry->d_inode->i_ino,
 661                     dentry->d_inode->i_generation, S_IFDIR, 0, 0);
 662
 663         dput(dentry);
 664
 665         dentry = lookup_one_len("__iopen__", current->fs->pwd,
 666                                 strlen("__iopen__"));
 667         if (IS_ERR(dentry)) {
 668                 rc = PTR_ERR(dentry);
 669                 CERROR("cannot lookup __iopen__ directory: rc = %d\n", rc);
 670                 GOTO(err_pop, rc);
 671         }
 672         mds->mds_id_de = dentry;
 673         if (!dentry->d_inode || is_bad_inode(dentry->d_inode)) {
 674                 rc = -ENOENT;
 675                 CERROR("__iopen__ directory has no inode? rc = %d\n", rc);
 676                 GOTO(err_id_de, rc);
 677         }
 678
 679         dentry = simple_mkdir(current->fs->pwd, "PENDING", 0777, 1);
 680         if (IS_ERR(dentry)) {
 681                 rc = PTR_ERR(dentry);
 682                 CERROR("cannot create PENDING directory: rc = %d\n", rc);
 683                 GOTO(err_id_de, rc);
 684         }
 685         mds->mds_pending_dir = dentry;
 686
 687         dentry = simple_mkdir(current->fs->pwd, "LOGS", 0777, 1);
 688         if (IS_ERR(dentry)) {
 689                 rc = PTR_ERR(dentry);
 690                 CERROR("cannot create LOGS directory: rc = %d\n", rc);
 691                 GOTO(err_pending, rc);
 692         }
 693         mds->mds_logs_dir = dentry;
 694
 695         dentry = simple_mkdir(current->fs->pwd, "OBJECTS", 0777, 1);
 696         if (IS_ERR(dentry)) {
 697                 rc = PTR_ERR(dentry);
 698                 CERROR("cannot create OBJECTS directory: rc = %d\n", rc);
 699                 GOTO(err_logs, rc);
 700         }
 701         mds->mds_objects_dir = dentry;
 702
 703         dentry = simple_mkdir(current->fs->pwd, "FIDS", 0777, 1);
 704         if (IS_ERR(dentry)) {
 705                 rc = PTR_ERR(dentry);
 706                 CERROR("cannot create FIDS directory: rc = %d\n", rc);
 707                 GOTO(err_objects, rc);
 708         }
 709         mds->mds_id_dir = dentry;
 710
 711         dentry = simple_mkdir(current->fs->pwd, "UNNAMED", 0777, 1);
 712         if (IS_ERR(dentry)) {
 713                 rc = PTR_ERR(dentry);
 714                 CERROR("cannot create UNNAMED directory: rc = %d\n", rc);
 715                 GOTO(err_unnamed, rc);
 716         }
 717         mds->mds_unnamed_dir = dentry;
 718
 719         /* open and test the last rcvd file */
 720         file = filp_open(LAST_RCVD, O_RDWR | O_CREAT, 0644);
 721         if (IS_ERR(file)) {
 722                 rc = PTR_ERR(file);
 723                 CERROR("cannot open/create %s file: rc = %d\n", LAST_RCVD, rc);
 724                 GOTO(err_id_dir, rc = PTR_ERR(file));
 725         }
 726         mds->mds_rcvd_filp = file;
 727
 728         if (!S_ISREG(file->f_dentry->d_inode->i_mode)) {
 729                 CERROR("%s is not a regular file!: mode = %o\n", LAST_RCVD,
 730                        file->f_dentry->d_inode->i_mode);
 731                 GOTO(err_last_rcvd, rc = -ENOENT);
 732         }
 733
 734         rc = mds_read_last_rcvd(obd, file);
 735         if (rc) {
 736                 CERROR("cannot read %s: rc = %d\n", LAST_RCVD, rc);
 737                 GOTO(err_last_rcvd, rc);
 738         }
 739
 740         /* open and test last fid file */
 741         file = filp_open(LAST_FID, O_RDWR | O_CREAT, 0644);
 742         if (IS_ERR(file)) {
 743                 rc = PTR_ERR(file);
 744                 CERROR("cannot open/create %s file: rc = %d\n",
 745                        LAST_FID, rc);
 746                 GOTO(err_client, rc = PTR_ERR(file));
 747         }
 748         mds->mds_fid_filp = file;
 749         if (!S_ISREG(file->f_dentry->d_inode->i_mode)) {
 750                 CERROR("%s is not a regular file!: mode = %o\n",
 751                        LAST_FID, file->f_dentry->d_inode->i_mode);
 752                 GOTO(err_last_fid, rc = -ENOENT);
 753         }
 754
 755         rc = mds_read_last_fid(obd, file);
 756         if (rc) {
 757                 CERROR("cannot read %s: rc = %d\n", LAST_FID, rc);
 758                 GOTO(err_last_fid, rc);
 759         }
 760
 761         /* open and test virtid fid file */
 762         file = filp_open(VIRT_FID, O_RDWR | O_CREAT, 0644);
 763         if (IS_ERR(file)) {
 764                 rc = PTR_ERR(file);
 765                 CERROR("cannot open/create %s file: rc = %d\n",
 766                        VIRT_FID, rc);
 767                 GOTO(err_last_fid, rc = PTR_ERR(file));
 768         }
 769         mds->mds_virtid_filp = file;
 770         if (!S_ISREG(file->f_dentry->d_inode->i_mode)) {
 771                 CERROR("%s is not a regular file!: mode = %o\n",
 772                        VIRT_FID, file->f_dentry->d_inode->i_mode);
 773                 GOTO(err_virtid_fid, rc = -ENOENT);
 774         }
 775
 776         rc = mds_read_virtid_fid(obd, file);
 777         if (rc) {
 778                 CERROR("cannot read %s: rc = %d\n", VIRT_FID, rc);
 779                 GOTO(err_virtid_fid, rc);
 780         }
 781
 782         /* open and test the lov objid file */
 783         file = filp_open(LOV_OBJID, O_RDWR | O_CREAT, 0644);
 784         if (IS_ERR(file)) {
 785                 rc = PTR_ERR(file);
 786                 CERROR("cannot open/create %s file: rc = %d\n", LOV_OBJID, rc);
 787                 GOTO(err_last_fid, rc = PTR_ERR(file));
 788         }
 789         mds->mds_dt_objid_filp = file;
 790         if (!S_ISREG(file->f_dentry->d_inode->i_mode)) {
 791                 CERROR("%s is not a regular file!: mode = %o\n", LOV_OBJID,
 792                        file->f_dentry->d_inode->i_mode);
 793                 GOTO(err_lov_objid, rc = -ENOENT);
 794         }
 795 err_pop:
 796         if (!rc) {
 797                 rc = mds_fs_post_setup(obd);
 798                 if (rc)
 799                         CERROR("can not post setup fsfilt\n");
 800         }
 801         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 802         return rc;
 803
 804 err_lov_objid:
 805         if (mds->mds_dt_objid_filp && filp_close(mds->mds_dt_objid_filp, 0))
 806                 CERROR("can't close %s after error\n", LOV_OBJID);
 807 err_virtid_fid:
 808         if (mds->mds_virtid_filp && filp_close(mds->mds_virtid_filp, 0))
 809                 CERROR("can't close %s after error\n", VIRT_FID);
 810 err_last_fid:
 811         if (mds->mds_fid_filp && filp_close(mds->mds_fid_filp, 0))
 812                 CERROR("can't close %s after error\n", LAST_FID);
 813 err_client:
 814         class_disconnect_exports(obd, 0);
 815 err_last_rcvd:
 816         if (mds->mds_rcvd_filp && filp_close(mds->mds_rcvd_filp, 0))
 817                 CERROR("can't close %s after error\n", LAST_RCVD);
 818 err_unnamed:
 819         dput(mds->mds_unnamed_dir);
 820 err_id_dir:
 821         dput(mds->mds_id_dir);
 822 err_objects:
 823         dput(mds->mds_objects_dir);
 824 err_logs:
 825         dput(mds->mds_logs_dir);
 826 err_pending:
 827         dput(mds->mds_pending_dir);
 828 err_id_de:
 829         dput(mds->mds_id_de);
 830         goto err_pop;
 831 }
 832
 833 static int  mds_fs_post_cleanup(struct obd_device *obd)
 834 {
 835         int    rc = 0;
 836         rc = fsfilt_post_cleanup(obd);
 837         return rc;
 838 }
 839
 840 int mds_fs_cleanup(struct obd_device *obd, int flags)
 841 {
 842         struct mds_obd *mds = &obd->u.mds;
 843         struct lvfs_run_ctxt saved;
 844         int rc = 0;
 845
 846         if (flags & OBD_OPT_FAILOVER)
 847                 CERROR("%s: shutting down for failover; client state will"
 848                        " be preserved.\n", obd->obd_name);
 849
 850         class_disconnect_exports(obd, flags); /* cleans up client info too */
 851         target_cleanup_recovery(obd);
 852         mds_server_free_data(mds);
 853
 854         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 855         if (mds->mds_virtid_filp) {
 856                 rc = filp_close(mds->mds_virtid_filp, 0);
 857                 mds->mds_virtid_filp = NULL;
 858                 if (rc)
 859                         CERROR("%s file won't close, rc = %d\n", VIRT_FID, rc);
 860         }
 861         if (mds->mds_fid_filp) {
 862                 rc = filp_close(mds->mds_fid_filp, 0);
 863                 mds->mds_fid_filp = NULL;
 864                 if (rc)
 865                         CERROR("%s file won't close, rc = %d\n", LAST_FID, rc);
 866         }
 867         if (mds->mds_rcvd_filp) {
 868                 rc = filp_close(mds->mds_rcvd_filp, 0);
 869                 mds->mds_rcvd_filp = NULL;
 870                 if (rc)
 871                         CERROR("%s file won't close, rc = %d\n", LAST_RCVD, rc);
 872         }
 873         if (mds->mds_dt_objid_filp) {
 874                 rc = filp_close(mds->mds_dt_objid_filp, 0);
 875                 mds->mds_dt_objid_filp = NULL;
 876                 if (rc)
 877                         CERROR("%s file won't close, rc=%d\n", LOV_OBJID, rc);
 878         }
 879         if (mds->mds_unnamed_dir != NULL) {
 880                 l_dput(mds->mds_unnamed_dir);
 881                 mds->mds_unnamed_dir = NULL;
 882         }
 883         if (mds->mds_id_dir != NULL) {
 884                 l_dput(mds->mds_id_dir);
 885                 mds->mds_id_dir = NULL;
 886         }
 887         if (mds->mds_objects_dir != NULL) {
 888                 l_dput(mds->mds_objects_dir);
 889                 mds->mds_objects_dir = NULL;
 890         }
 891         if (mds->mds_logs_dir) {
 892                 l_dput(mds->mds_logs_dir);
 893                 mds->mds_logs_dir = NULL;
 894         }
 895         if (mds->mds_pending_dir) {
 896                 l_dput(mds->mds_pending_dir);
 897                 mds->mds_pending_dir = NULL;
 898         }
 899         rc = mds_fs_post_cleanup(obd);
 900
 901         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 902         shrink_dcache_parent(mds->mds_id_de);
 903         dput(mds->mds_id_de);
 904
 905         return rc;
 906 }
 907
 908 /* Creates an object with the same name as its id.  Because this is not at all
 909  * performance sensitive, it is accomplished by creating a file, checking the
 910  * id, and renaming it. */
 911 int mds_obd_create(struct obd_export *exp, struct obdo *oa,
 912                    void *acl, int acl_size,
 913                    struct lov_stripe_md **ea, struct obd_trans_info *oti)
 914 {
 915         struct mds_obd *mds = &exp->exp_obd->u.mds;
 916         struct inode *parent_inode = mds->mds_objects_dir->d_inode;
 917         struct file *filp;
 918         struct dentry *dchild;
 919         struct lvfs_run_ctxt saved;
 920         char idname[LL_ID_NAMELEN];
 921         int rc = 0, err, idlen;
 922         void *handle;
 923         ENTRY;
 924
 925         push_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, NULL);
 926         down(&parent_inode->i_sem);
 927         if (oa->o_id) {
 928                 idlen = ll_id2str(idname, oa->o_id, oa->o_generation);
 929                 dchild = lookup_one_len(idname, mds->mds_objects_dir, idlen);
 930                 if (IS_ERR(dchild))
 931                         GOTO(out_pop, rc = PTR_ERR(dchild));
 932
 933                 if (dchild->d_inode == NULL) {
 934                         struct dentry_params dp;
 935                         struct inode *inode;
 936
 937                         CWARN("creating log with ID "LPU64"\n", oa->o_id);
 938
 939                         dchild->d_fsdata = (void *) &dp;
 940                         dp.p_ptr = NULL;
 941                         dp.p_inum = oa->o_id;
 942                         rc = ll_vfs_create(parent_inode, dchild, S_IFREG, NULL);
 943                         if (dchild->d_fsdata == (void *)(unsigned long)oa->o_id)
 944                                 dchild->d_fsdata = NULL;
 945                         if (rc) {
 946                                 CDEBUG(D_INODE, "err during create: %d\n", rc);
 947                                 dput(dchild);
 948                                 GOTO(out_pop, rc);
 949                         }
 950                         inode = dchild->d_inode;
 951                         LASSERT(inode->i_ino == oa->o_id);
 952                         inode->i_generation = oa->o_generation;
 953                         CDEBUG(D_HA, "recreated ino %lu with gen %u\n",
 954                                inode->i_ino, inode->i_generation);
 955                         mark_inode_dirty(inode);
 956                 } else {
 957                         CWARN("it should be here!\n");
 958                 }
 959                 GOTO(out_pop, rc);
 960         }
 961
 962         sprintf(idname, "OBJECTS/%u.%u", ll_insecure_random_int(), current->pid);
 963         filp = filp_open(idname, O_CREAT | O_EXCL, 0644);
 964         if (IS_ERR(filp)) {
 965                 rc = PTR_ERR(filp);
 966                 if (rc == -EEXIST) {
 967                         CERROR("impossible object name collision %s\n",
 968                                idname);
 969                         LBUG();
 970                 }
 971                 CERROR("error creating tmp object %s: rc %d\n",
 972                        idname, rc);
 973                 GOTO(out_pop, rc);
 974         }
 975
 976         LASSERT(mds->mds_objects_dir == filp->f_dentry->d_parent);
 977
 978         oa->o_id = filp->f_dentry->d_inode->i_ino;
 979         oa->o_generation = filp->f_dentry->d_inode->i_generation;
 980         idlen = ll_id2str(idname, oa->o_id, oa->o_generation);
 981
 982         CWARN("created log anonymous "LPU64"/%u\n",
 983               oa->o_id, oa->o_generation);
 984
 985         dchild = lookup_one_len(idname, mds->mds_objects_dir, idlen);
 986         if (IS_ERR(dchild)) {
 987                 CERROR("getting neg dentry for obj rename: %d\n", rc);
 988                 GOTO(out_close, rc = PTR_ERR(dchild));
 989         }
 990         if (dchild->d_inode != NULL) {
 991                 CERROR("impossible non-negative obj dentry " LPU64":%u!\n",
 992                        oa->o_id, oa->o_generation);
 993                 LBUG();
 994         }
 995
 996         handle = fsfilt_start(exp->exp_obd, mds->mds_objects_dir->d_inode,
 997                               FSFILT_OP_RENAME, NULL);
 998         if (IS_ERR(handle))
 999                 GOTO(out_dput, rc = PTR_ERR(handle));
1000
1001         lock_kernel();
1002         rc = vfs_rename(mds->mds_objects_dir->d_inode, filp->f_dentry,
1003                         mds->mds_objects_dir->d_inode, dchild);
1004         unlock_kernel();
1005         if (rc)
1006                 CERROR("error renaming new object "LPU64":%u: rc %d\n",
1007                        oa->o_id, oa->o_generation, rc);
1008
1009         err = fsfilt_commit(exp->exp_obd, mds->mds_sb,
1010                             mds->mds_objects_dir->d_inode, handle, 0);
1011         if (!err) {
1012                 oa->o_gr = FILTER_GROUP_FIRST_MDS + mds->mds_num;
1013                 oa->o_valid |= OBD_MD_FLID | OBD_MD_FLGENER | OBD_MD_FLGROUP;
1014         } else if (!rc)
1015                 rc = err;
1016 out_dput:
1017         dput(dchild);
1018 out_close:
1019         err = filp_close(filp, 0);
1020         if (err) {
1021                 CERROR("closing tmpfile %s: rc %d\n", idname, rc);
1022                 if (!rc)
1023                         rc = err;
1024         }
1025 out_pop:
1026         up(&parent_inode->i_sem);
1027         pop_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, NULL);
1028         RETURN(rc);
1029 }
1030
1031 int mds_obd_destroy(struct obd_export *exp, struct obdo *oa,
1032                     struct lov_stripe_md *ea, struct obd_trans_info *oti)
1033 {
1034         struct mds_obd *mds = &exp->exp_obd->u.mds;
1035         struct inode *parent_inode = mds->mds_objects_dir->d_inode;
1036         struct obd_device *obd = exp->exp_obd;
1037         struct lvfs_run_ctxt saved;
1038         char idname[LL_ID_NAMELEN];
1039         struct dentry *de;
1040         void *handle;
1041         int err, idlen, rc = 0;
1042         ENTRY;
1043
1044         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
1045
1046         idlen = ll_id2str(idname, oa->o_id, oa->o_generation);
1047
1048         down(&parent_inode->i_sem);
1049         de = lookup_one_len(idname, mds->mds_objects_dir, idlen);
1050         if (IS_ERR(de) || de->d_inode == NULL) {
1051                 rc = IS_ERR(de) ? PTR_ERR(de) : -ENOENT;
1052                 CERROR("destroying non-existent object "LPU64" %s: rc %d\n",
1053                        oa->o_id, idname, rc);
1054                 GOTO(out_dput, rc);
1055         }
1056         /* Stripe count is 1 here since this is some MDS specific stuff
1057            that is unlinked, not spanned across multiple OSTs */
1058         handle = fsfilt_start_log(obd, mds->mds_objects_dir->d_inode,
1059                                   FSFILT_OP_UNLINK, oti, 1);
1060
1061         if (IS_ERR(handle))
1062                 GOTO(out_dput, rc = PTR_ERR(handle));
1063
1064         rc = vfs_unlink(mds->mds_objects_dir->d_inode, de);
1065         if (rc)
1066                 CERROR("error destroying object "LPU64":%u: rc %d\n",
1067                        oa->o_id, oa->o_generation, rc);
1068
1069         err = fsfilt_commit(obd, mds->mds_sb, mds->mds_objects_dir->d_inode,
1070                             handle, exp->exp_sync);
1071         if (err && !rc)
1072                 rc = err;
1073 out_dput:
1074         if (de != NULL)
1075                 l_dput(de);
1076         up(&parent_inode->i_sem);
1077         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
1078         RETURN(rc);
1079 }