linux/fs/ocfs2/inode.c
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   1/* -*- mode: c; c-basic-offset: 8; -*-
   2 * vim: noexpandtab sw=8 ts=8 sts=0:
   3 *
   4 * inode.c
   5 *
   6 * vfs' aops, fops, dops and iops
   7 *
   8 * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
   9 *
  10 * This program is free software; you can redistribute it and/or
  11 * modify it under the terms of the GNU General Public
  12 * License as published by the Free Software Foundation; either
  13 * version 2 of the License, or (at your option) any later version.
  14 *
  15 * This program is distributed in the hope that it will be useful,
  16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18 * General Public License for more details.
  19 *
  20 * You should have received a copy of the GNU General Public
  21 * License along with this program; if not, write to the
  22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23 * Boston, MA 021110-1307, USA.
  24 */
  25
  26#include <linux/fs.h>
  27#include <linux/types.h>
  28#include <linux/highmem.h>
  29#include <linux/pagemap.h>
  30#include <linux/quotaops.h>
  31
  32#include <asm/byteorder.h>
  33
  34#include <cluster/masklog.h>
  35
  36#include "ocfs2.h"
  37
  38#include "alloc.h"
  39#include "dir.h"
  40#include "blockcheck.h"
  41#include "dlmglue.h"
  42#include "extent_map.h"
  43#include "file.h"
  44#include "heartbeat.h"
  45#include "inode.h"
  46#include "journal.h"
  47#include "namei.h"
  48#include "suballoc.h"
  49#include "super.h"
  50#include "symlink.h"
  51#include "sysfile.h"
  52#include "uptodate.h"
  53#include "xattr.h"
  54#include "refcounttree.h"
  55#include "ocfs2_trace.h"
  56
  57#include "buffer_head_io.h"
  58
  59struct ocfs2_find_inode_args
  60{
  61        u64             fi_blkno;
  62        unsigned long   fi_ino;
  63        unsigned int    fi_flags;
  64        unsigned int    fi_sysfile_type;
  65};
  66
  67static struct lock_class_key ocfs2_sysfile_lock_key[NUM_SYSTEM_INODES];
  68
  69static int ocfs2_read_locked_inode(struct inode *inode,
  70                                   struct ocfs2_find_inode_args *args);
  71static int ocfs2_init_locked_inode(struct inode *inode, void *opaque);
  72static int ocfs2_find_actor(struct inode *inode, void *opaque);
  73static int ocfs2_truncate_for_delete(struct ocfs2_super *osb,
  74                                    struct inode *inode,
  75                                    struct buffer_head *fe_bh);
  76
  77void ocfs2_set_inode_flags(struct inode *inode)
  78{
  79        unsigned int flags = OCFS2_I(inode)->ip_attr;
  80
  81        inode->i_flags &= ~(S_IMMUTABLE |
  82                S_SYNC | S_APPEND | S_NOATIME | S_DIRSYNC);
  83
  84        if (flags & OCFS2_IMMUTABLE_FL)
  85                inode->i_flags |= S_IMMUTABLE;
  86
  87        if (flags & OCFS2_SYNC_FL)
  88                inode->i_flags |= S_SYNC;
  89        if (flags & OCFS2_APPEND_FL)
  90                inode->i_flags |= S_APPEND;
  91        if (flags & OCFS2_NOATIME_FL)
  92                inode->i_flags |= S_NOATIME;
  93        if (flags & OCFS2_DIRSYNC_FL)
  94                inode->i_flags |= S_DIRSYNC;
  95}
  96
  97/* Propagate flags from i_flags to OCFS2_I(inode)->ip_attr */
  98void ocfs2_get_inode_flags(struct ocfs2_inode_info *oi)
  99{
 100        unsigned int flags = oi->vfs_inode.i_flags;
 101
 102        oi->ip_attr &= ~(OCFS2_SYNC_FL|OCFS2_APPEND_FL|
 103                        OCFS2_IMMUTABLE_FL|OCFS2_NOATIME_FL|OCFS2_DIRSYNC_FL);
 104        if (flags & S_SYNC)
 105                oi->ip_attr |= OCFS2_SYNC_FL;
 106        if (flags & S_APPEND)
 107                oi->ip_attr |= OCFS2_APPEND_FL;
 108        if (flags & S_IMMUTABLE)
 109                oi->ip_attr |= OCFS2_IMMUTABLE_FL;
 110        if (flags & S_NOATIME)
 111                oi->ip_attr |= OCFS2_NOATIME_FL;
 112        if (flags & S_DIRSYNC)
 113                oi->ip_attr |= OCFS2_DIRSYNC_FL;
 114}
 115
 116struct inode *ocfs2_ilookup(struct super_block *sb, u64 blkno)
 117{
 118        struct ocfs2_find_inode_args args;
 119
 120        args.fi_blkno = blkno;
 121        args.fi_flags = 0;
 122        args.fi_ino = ino_from_blkno(sb, blkno);
 123        args.fi_sysfile_type = 0;
 124
 125        return ilookup5(sb, blkno, ocfs2_find_actor, &args);
 126}
 127struct inode *ocfs2_iget(struct ocfs2_super *osb, u64 blkno, unsigned flags,
 128                         int sysfile_type)
 129{
 130        struct inode *inode = NULL;
 131        struct super_block *sb = osb->sb;
 132        struct ocfs2_find_inode_args args;
 133
 134        trace_ocfs2_iget_begin((unsigned long long)blkno, flags,
 135                               sysfile_type);
 136
 137        /* Ok. By now we've either got the offsets passed to us by the
 138         * caller, or we just pulled them off the bh. Lets do some
 139         * sanity checks to make sure they're OK. */
 140        if (blkno == 0) {
 141                inode = ERR_PTR(-EINVAL);
 142                mlog_errno(PTR_ERR(inode));
 143                goto bail;
 144        }
 145
 146        args.fi_blkno = blkno;
 147        args.fi_flags = flags;
 148        args.fi_ino = ino_from_blkno(sb, blkno);
 149        args.fi_sysfile_type = sysfile_type;
 150
 151        inode = iget5_locked(sb, args.fi_ino, ocfs2_find_actor,
 152                             ocfs2_init_locked_inode, &args);
 153        /* inode was *not* in the inode cache. 2.6.x requires
 154         * us to do our own read_inode call and unlock it
 155         * afterwards. */
 156        if (inode == NULL) {
 157                inode = ERR_PTR(-ENOMEM);
 158                mlog_errno(PTR_ERR(inode));
 159                goto bail;
 160        }
 161        trace_ocfs2_iget5_locked(inode->i_state);
 162        if (inode->i_state & I_NEW) {
 163                ocfs2_read_locked_inode(inode, &args);
 164                unlock_new_inode(inode);
 165        }
 166        if (is_bad_inode(inode)) {
 167                iput(inode);
 168                inode = ERR_PTR(-ESTALE);
 169                goto bail;
 170        }
 171
 172bail:
 173        if (!IS_ERR(inode)) {
 174                trace_ocfs2_iget_end(inode, 
 175                        (unsigned long long)OCFS2_I(inode)->ip_blkno);
 176        }
 177
 178        return inode;
 179}
 180
 181
 182/*
 183 * here's how inodes get read from disk:
 184 * iget5_locked -> find_actor -> OCFS2_FIND_ACTOR
 185 * found? : return the in-memory inode
 186 * not found? : get_new_inode -> OCFS2_INIT_LOCKED_INODE
 187 */
 188
 189static int ocfs2_find_actor(struct inode *inode, void *opaque)
 190{
 191        struct ocfs2_find_inode_args *args = NULL;
 192        struct ocfs2_inode_info *oi = OCFS2_I(inode);
 193        int ret = 0;
 194
 195        args = opaque;
 196
 197        mlog_bug_on_msg(!inode, "No inode in find actor!\n");
 198
 199        trace_ocfs2_find_actor(inode, inode->i_ino, opaque, args->fi_blkno);
 200
 201        if (oi->ip_blkno != args->fi_blkno)
 202                goto bail;
 203
 204        ret = 1;
 205bail:
 206        return ret;
 207}
 208
 209/*
 210 * initialize the new inode, but don't do anything that would cause
 211 * us to sleep.
 212 * return 0 on success, 1 on failure
 213 */
 214static int ocfs2_init_locked_inode(struct inode *inode, void *opaque)
 215{
 216        struct ocfs2_find_inode_args *args = opaque;
 217        static struct lock_class_key ocfs2_quota_ip_alloc_sem_key,
 218                                     ocfs2_file_ip_alloc_sem_key;
 219
 220        inode->i_ino = args->fi_ino;
 221        OCFS2_I(inode)->ip_blkno = args->fi_blkno;
 222        if (args->fi_sysfile_type != 0)
 223                lockdep_set_class(&inode->i_mutex,
 224                        &ocfs2_sysfile_lock_key[args->fi_sysfile_type]);
 225        if (args->fi_sysfile_type == USER_QUOTA_SYSTEM_INODE ||
 226            args->fi_sysfile_type == GROUP_QUOTA_SYSTEM_INODE ||
 227            args->fi_sysfile_type == LOCAL_USER_QUOTA_SYSTEM_INODE ||
 228            args->fi_sysfile_type == LOCAL_GROUP_QUOTA_SYSTEM_INODE)
 229                lockdep_set_class(&OCFS2_I(inode)->ip_alloc_sem,
 230                                  &ocfs2_quota_ip_alloc_sem_key);
 231        else
 232                lockdep_set_class(&OCFS2_I(inode)->ip_alloc_sem,
 233                                  &ocfs2_file_ip_alloc_sem_key);
 234
 235        return 0;
 236}
 237
 238void ocfs2_populate_inode(struct inode *inode, struct ocfs2_dinode *fe,
 239                          int create_ino)
 240{
 241        struct super_block *sb;
 242        struct ocfs2_super *osb;
 243        int use_plocks = 1;
 244
 245        sb = inode->i_sb;
 246        osb = OCFS2_SB(sb);
 247
 248        if ((osb->s_mount_opt & OCFS2_MOUNT_LOCALFLOCKS) ||
 249            ocfs2_mount_local(osb) || !ocfs2_stack_supports_plocks())
 250                use_plocks = 0;
 251
 252        /*
 253         * These have all been checked by ocfs2_read_inode_block() or set
 254         * by ocfs2_mknod_locked(), so a failure is a code bug.
 255         */
 256        BUG_ON(!OCFS2_IS_VALID_DINODE(fe));  /* This means that read_inode
 257                                                cannot create a superblock
 258                                                inode today.  change if
 259                                                that is needed. */
 260        BUG_ON(!(fe->i_flags & cpu_to_le32(OCFS2_VALID_FL)));
 261        BUG_ON(le32_to_cpu(fe->i_fs_generation) != osb->fs_generation);
 262
 263
 264        OCFS2_I(inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
 265        OCFS2_I(inode)->ip_attr = le32_to_cpu(fe->i_attr);
 266        OCFS2_I(inode)->ip_dyn_features = le16_to_cpu(fe->i_dyn_features);
 267
 268        inode->i_version = 1;
 269        inode->i_generation = le32_to_cpu(fe->i_generation);
 270        inode->i_rdev = huge_decode_dev(le64_to_cpu(fe->id1.dev1.i_rdev));
 271        inode->i_mode = le16_to_cpu(fe->i_mode);
 272        inode->i_uid = le32_to_cpu(fe->i_uid);
 273        inode->i_gid = le32_to_cpu(fe->i_gid);
 274
 275        /* Fast symlinks will have i_size but no allocated clusters. */
 276        if (S_ISLNK(inode->i_mode) && !fe->i_clusters) {
 277                inode->i_blocks = 0;
 278                inode->i_mapping->a_ops = &ocfs2_fast_symlink_aops;
 279        } else {
 280                inode->i_blocks = ocfs2_inode_sector_count(inode);
 281                inode->i_mapping->a_ops = &ocfs2_aops;
 282        }
 283        inode->i_atime.tv_sec = le64_to_cpu(fe->i_atime);
 284        inode->i_atime.tv_nsec = le32_to_cpu(fe->i_atime_nsec);
 285        inode->i_mtime.tv_sec = le64_to_cpu(fe->i_mtime);
 286        inode->i_mtime.tv_nsec = le32_to_cpu(fe->i_mtime_nsec);
 287        inode->i_ctime.tv_sec = le64_to_cpu(fe->i_ctime);
 288        inode->i_ctime.tv_nsec = le32_to_cpu(fe->i_ctime_nsec);
 289
 290        if (OCFS2_I(inode)->ip_blkno != le64_to_cpu(fe->i_blkno))
 291                mlog(ML_ERROR,
 292                     "ip_blkno %llu != i_blkno %llu!\n",
 293                     (unsigned long long)OCFS2_I(inode)->ip_blkno,
 294                     (unsigned long long)le64_to_cpu(fe->i_blkno));
 295
 296        set_nlink(inode, ocfs2_read_links_count(fe));
 297
 298        trace_ocfs2_populate_inode(OCFS2_I(inode)->ip_blkno,
 299                                   le32_to_cpu(fe->i_flags));
 300        if (fe->i_flags & cpu_to_le32(OCFS2_SYSTEM_FL)) {
 301                OCFS2_I(inode)->ip_flags |= OCFS2_INODE_SYSTEM_FILE;
 302                inode->i_flags |= S_NOQUOTA;
 303        }
 304  
 305        if (fe->i_flags & cpu_to_le32(OCFS2_LOCAL_ALLOC_FL)) {
 306                OCFS2_I(inode)->ip_flags |= OCFS2_INODE_BITMAP;
 307        } else if (fe->i_flags & cpu_to_le32(OCFS2_BITMAP_FL)) {
 308                OCFS2_I(inode)->ip_flags |= OCFS2_INODE_BITMAP;
 309        } else if (fe->i_flags & cpu_to_le32(OCFS2_QUOTA_FL)) {
 310                inode->i_flags |= S_NOQUOTA;
 311        } else if (fe->i_flags & cpu_to_le32(OCFS2_SUPER_BLOCK_FL)) {
 312                /* we can't actually hit this as read_inode can't
 313                 * handle superblocks today ;-) */
 314                BUG();
 315        }
 316
 317        switch (inode->i_mode & S_IFMT) {
 318            case S_IFREG:
 319                    if (use_plocks)
 320                            inode->i_fop = &ocfs2_fops;
 321                    else
 322                            inode->i_fop = &ocfs2_fops_no_plocks;
 323                    inode->i_op = &ocfs2_file_iops;
 324                    i_size_write(inode, le64_to_cpu(fe->i_size));
 325                    break;
 326            case S_IFDIR:
 327                    inode->i_op = &ocfs2_dir_iops;
 328                    if (use_plocks)
 329                            inode->i_fop = &ocfs2_dops;
 330                    else
 331                            inode->i_fop = &ocfs2_dops_no_plocks;
 332                    i_size_write(inode, le64_to_cpu(fe->i_size));
 333                    OCFS2_I(inode)->ip_dir_lock_gen = 1;
 334                    break;
 335            case S_IFLNK:
 336                    inode->i_op = &ocfs2_symlink_inode_operations;
 337                    i_size_write(inode, le64_to_cpu(fe->i_size));
 338                    break;
 339            default:
 340                    inode->i_op = &ocfs2_special_file_iops;
 341                    init_special_inode(inode, inode->i_mode,
 342                                       inode->i_rdev);
 343                    break;
 344        }
 345
 346        if (create_ino) {
 347                inode->i_ino = ino_from_blkno(inode->i_sb,
 348                               le64_to_cpu(fe->i_blkno));
 349
 350                /*
 351                 * If we ever want to create system files from kernel,
 352                 * the generation argument to
 353                 * ocfs2_inode_lock_res_init() will have to change.
 354                 */
 355                BUG_ON(le32_to_cpu(fe->i_flags) & OCFS2_SYSTEM_FL);
 356
 357                ocfs2_inode_lock_res_init(&OCFS2_I(inode)->ip_inode_lockres,
 358                                          OCFS2_LOCK_TYPE_META, 0, inode);
 359
 360                ocfs2_inode_lock_res_init(&OCFS2_I(inode)->ip_open_lockres,
 361                                          OCFS2_LOCK_TYPE_OPEN, 0, inode);
 362        }
 363
 364        ocfs2_inode_lock_res_init(&OCFS2_I(inode)->ip_rw_lockres,
 365                                  OCFS2_LOCK_TYPE_RW, inode->i_generation,
 366                                  inode);
 367
 368        ocfs2_set_inode_flags(inode);
 369
 370        OCFS2_I(inode)->ip_last_used_slot = 0;
 371        OCFS2_I(inode)->ip_last_used_group = 0;
 372
 373        if (S_ISDIR(inode->i_mode))
 374                ocfs2_resv_set_type(&OCFS2_I(inode)->ip_la_data_resv,
 375                                    OCFS2_RESV_FLAG_DIR);
 376}
 377
 378static int ocfs2_read_locked_inode(struct inode *inode,
 379                                   struct ocfs2_find_inode_args *args)
 380{
 381        struct super_block *sb;
 382        struct ocfs2_super *osb;
 383        struct ocfs2_dinode *fe;
 384        struct buffer_head *bh = NULL;
 385        int status, can_lock;
 386        u32 generation = 0;
 387
 388        status = -EINVAL;
 389        if (inode == NULL || inode->i_sb == NULL) {
 390                mlog(ML_ERROR, "bad inode\n");
 391                return status;
 392        }
 393        sb = inode->i_sb;
 394        osb = OCFS2_SB(sb);
 395
 396        if (!args) {
 397                mlog(ML_ERROR, "bad inode args\n");
 398                make_bad_inode(inode);
 399                return status;
 400        }
 401
 402        /*
 403         * To improve performance of cold-cache inode stats, we take
 404         * the cluster lock here if possible.
 405         *
 406         * Generally, OCFS2 never trusts the contents of an inode
 407         * unless it's holding a cluster lock, so taking it here isn't
 408         * a correctness issue as much as it is a performance
 409         * improvement.
 410         *
 411         * There are three times when taking the lock is not a good idea:
 412         *
 413         * 1) During startup, before we have initialized the DLM.
 414         *
 415         * 2) If we are reading certain system files which never get
 416         *    cluster locks (local alloc, truncate log).
 417         *
 418         * 3) If the process doing the iget() is responsible for
 419         *    orphan dir recovery. We're holding the orphan dir lock and
 420         *    can get into a deadlock with another process on another
 421         *    node in ->delete_inode().
 422         *
 423         * #1 and #2 can be simply solved by never taking the lock
 424         * here for system files (which are the only type we read
 425         * during mount). It's a heavier approach, but our main
 426         * concern is user-accessible files anyway.
 427         *
 428         * #3 works itself out because we'll eventually take the
 429         * cluster lock before trusting anything anyway.
 430         */
 431        can_lock = !(args->fi_flags & OCFS2_FI_FLAG_SYSFILE)
 432                && !(args->fi_flags & OCFS2_FI_FLAG_ORPHAN_RECOVERY)
 433                && !ocfs2_mount_local(osb);
 434
 435        trace_ocfs2_read_locked_inode(
 436                (unsigned long long)OCFS2_I(inode)->ip_blkno, can_lock);
 437
 438        /*
 439         * To maintain backwards compatibility with older versions of
 440         * ocfs2-tools, we still store the generation value for system
 441         * files. The only ones that actually matter to userspace are
 442         * the journals, but it's easier and inexpensive to just flag
 443         * all system files similarly.
 444         */
 445        if (args->fi_flags & OCFS2_FI_FLAG_SYSFILE)
 446                generation = osb->fs_generation;
 447
 448        ocfs2_inode_lock_res_init(&OCFS2_I(inode)->ip_inode_lockres,
 449                                  OCFS2_LOCK_TYPE_META,
 450                                  generation, inode);
 451
 452        ocfs2_inode_lock_res_init(&OCFS2_I(inode)->ip_open_lockres,
 453                                  OCFS2_LOCK_TYPE_OPEN,
 454                                  0, inode);
 455
 456        if (can_lock) {
 457                status = ocfs2_open_lock(inode);
 458                if (status) {
 459                        make_bad_inode(inode);
 460                        mlog_errno(status);
 461                        return status;
 462                }
 463                status = ocfs2_inode_lock(inode, NULL, 0);
 464                if (status) {
 465                        make_bad_inode(inode);
 466                        mlog_errno(status);
 467                        return status;
 468                }
 469        }
 470
 471        if (args->fi_flags & OCFS2_FI_FLAG_ORPHAN_RECOVERY) {
 472                status = ocfs2_try_open_lock(inode, 0);
 473                if (status) {
 474                        make_bad_inode(inode);
 475                        return status;
 476                }
 477        }
 478
 479        if (can_lock) {
 480                status = ocfs2_read_inode_block_full(inode, &bh,
 481                                                     OCFS2_BH_IGNORE_CACHE);
 482        } else {
 483                status = ocfs2_read_blocks_sync(osb, args->fi_blkno, 1, &bh);
 484                /*
 485                 * If buffer is in jbd, then its checksum may not have been
 486                 * computed as yet.
 487                 */
 488                if (!status && !buffer_jbd(bh))
 489                        status = ocfs2_validate_inode_block(osb->sb, bh);
 490        }
 491        if (status < 0) {
 492                mlog_errno(status);
 493                goto bail;
 494        }
 495
 496        status = -EINVAL;
 497        fe = (struct ocfs2_dinode *) bh->b_data;
 498
 499        /*
 500         * This is a code bug. Right now the caller needs to
 501         * understand whether it is asking for a system file inode or
 502         * not so the proper lock names can be built.
 503         */
 504        mlog_bug_on_msg(!!(fe->i_flags & cpu_to_le32(OCFS2_SYSTEM_FL)) !=
 505                        !!(args->fi_flags & OCFS2_FI_FLAG_SYSFILE),
 506                        "Inode %llu: system file state is ambigous\n",
 507                        (unsigned long long)args->fi_blkno);
 508
 509        if (S_ISCHR(le16_to_cpu(fe->i_mode)) ||
 510            S_ISBLK(le16_to_cpu(fe->i_mode)))
 511                inode->i_rdev = huge_decode_dev(le64_to_cpu(fe->id1.dev1.i_rdev));
 512
 513        ocfs2_populate_inode(inode, fe, 0);
 514
 515        BUG_ON(args->fi_blkno != le64_to_cpu(fe->i_blkno));
 516
 517        status = 0;
 518
 519bail:
 520        if (can_lock)
 521                ocfs2_inode_unlock(inode, 0);
 522
 523        if (status < 0)
 524                make_bad_inode(inode);
 525
 526        if (args && bh)
 527                brelse(bh);
 528
 529        return status;
 530}
 531
 532void ocfs2_sync_blockdev(struct super_block *sb)
 533{
 534        sync_blockdev(sb->s_bdev);
 535}
 536
 537static int ocfs2_truncate_for_delete(struct ocfs2_super *osb,
 538                                     struct inode *inode,
 539                                     struct buffer_head *fe_bh)
 540{
 541        int status = 0;
 542        struct ocfs2_dinode *fe;
 543        handle_t *handle = NULL;
 544
 545        fe = (struct ocfs2_dinode *) fe_bh->b_data;
 546
 547        /*
 548         * This check will also skip truncate of inodes with inline
 549         * data and fast symlinks.
 550         */
 551        if (fe->i_clusters) {
 552                if (ocfs2_should_order_data(inode))
 553                        ocfs2_begin_ordered_truncate(inode, 0);
 554
 555                handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 556                if (IS_ERR(handle)) {
 557                        status = PTR_ERR(handle);
 558                        handle = NULL;
 559                        mlog_errno(status);
 560                        goto out;
 561                }
 562
 563                status = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
 564                                                 fe_bh,
 565                                                 OCFS2_JOURNAL_ACCESS_WRITE);
 566                if (status < 0) {
 567                        mlog_errno(status);
 568                        goto out;
 569                }
 570
 571                i_size_write(inode, 0);
 572
 573                status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
 574                if (status < 0) {
 575                        mlog_errno(status);
 576                        goto out;
 577                }
 578
 579                ocfs2_commit_trans(osb, handle);
 580                handle = NULL;
 581
 582                status = ocfs2_commit_truncate(osb, inode, fe_bh);
 583                if (status < 0) {
 584                        mlog_errno(status);
 585                        goto out;
 586                }
 587        }
 588
 589out:
 590        if (handle)
 591                ocfs2_commit_trans(osb, handle);
 592        return status;
 593}
 594
 595static int ocfs2_remove_inode(struct inode *inode,
 596                              struct buffer_head *di_bh,
 597                              struct inode *orphan_dir_inode,
 598                              struct buffer_head *orphan_dir_bh)
 599{
 600        int status;
 601        struct inode *inode_alloc_inode = NULL;
 602        struct buffer_head *inode_alloc_bh = NULL;
 603        handle_t *handle;
 604        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 605        struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data;
 606
 607        inode_alloc_inode =
 608                ocfs2_get_system_file_inode(osb, INODE_ALLOC_SYSTEM_INODE,
 609                                            le16_to_cpu(di->i_suballoc_slot));
 610        if (!inode_alloc_inode) {
 611                status = -EEXIST;
 612                mlog_errno(status);
 613                goto bail;
 614        }
 615
 616        mutex_lock(&inode_alloc_inode->i_mutex);
 617        status = ocfs2_inode_lock(inode_alloc_inode, &inode_alloc_bh, 1);
 618        if (status < 0) {
 619                mutex_unlock(&inode_alloc_inode->i_mutex);
 620
 621                mlog_errno(status);
 622                goto bail;
 623        }
 624
 625        handle = ocfs2_start_trans(osb, OCFS2_DELETE_INODE_CREDITS +
 626                                   ocfs2_quota_trans_credits(inode->i_sb));
 627        if (IS_ERR(handle)) {
 628                status = PTR_ERR(handle);
 629                mlog_errno(status);
 630                goto bail_unlock;
 631        }
 632
 633        if (!(OCFS2_I(inode)->ip_flags & OCFS2_INODE_SKIP_ORPHAN_DIR)) {
 634                status = ocfs2_orphan_del(osb, handle, orphan_dir_inode, inode,
 635                                          orphan_dir_bh);
 636                if (status < 0) {
 637                        mlog_errno(status);
 638                        goto bail_commit;
 639                }
 640        }
 641
 642        /* set the inodes dtime */
 643        status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
 644                                         OCFS2_JOURNAL_ACCESS_WRITE);
 645        if (status < 0) {
 646                mlog_errno(status);
 647                goto bail_commit;
 648        }
 649
 650        di->i_dtime = cpu_to_le64(CURRENT_TIME.tv_sec);
 651        di->i_flags &= cpu_to_le32(~(OCFS2_VALID_FL | OCFS2_ORPHANED_FL));
 652        ocfs2_journal_dirty(handle, di_bh);
 653
 654        ocfs2_remove_from_cache(INODE_CACHE(inode), di_bh);
 655        dquot_free_inode(inode);
 656
 657        status = ocfs2_free_dinode(handle, inode_alloc_inode,
 658                                   inode_alloc_bh, di);
 659        if (status < 0)
 660                mlog_errno(status);
 661
 662bail_commit:
 663        ocfs2_commit_trans(osb, handle);
 664bail_unlock:
 665        ocfs2_inode_unlock(inode_alloc_inode, 1);
 666        mutex_unlock(&inode_alloc_inode->i_mutex);
 667        brelse(inode_alloc_bh);
 668bail:
 669        iput(inode_alloc_inode);
 670
 671        return status;
 672}
 673
 674/*
 675 * Serialize with orphan dir recovery. If the process doing
 676 * recovery on this orphan dir does an iget() with the dir
 677 * i_mutex held, we'll deadlock here. Instead we detect this
 678 * and exit early - recovery will wipe this inode for us.
 679 */
 680static int ocfs2_check_orphan_recovery_state(struct ocfs2_super *osb,
 681                                             int slot)
 682{
 683        int ret = 0;
 684
 685        spin_lock(&osb->osb_lock);
 686        if (ocfs2_node_map_test_bit(osb, &osb->osb_recovering_orphan_dirs, slot)) {
 687                ret = -EDEADLK;
 688                goto out;
 689        }
 690        /* This signals to the orphan recovery process that it should
 691         * wait for us to handle the wipe. */
 692        osb->osb_orphan_wipes[slot]++;
 693out:
 694        spin_unlock(&osb->osb_lock);
 695        trace_ocfs2_check_orphan_recovery_state(slot, ret);
 696        return ret;
 697}
 698
 699static void ocfs2_signal_wipe_completion(struct ocfs2_super *osb,
 700                                         int slot)
 701{
 702        spin_lock(&osb->osb_lock);
 703        osb->osb_orphan_wipes[slot]--;
 704        spin_unlock(&osb->osb_lock);
 705
 706        wake_up(&osb->osb_wipe_event);
 707}
 708
 709static int ocfs2_wipe_inode(struct inode *inode,
 710                            struct buffer_head *di_bh)
 711{
 712        int status, orphaned_slot = -1;
 713        struct inode *orphan_dir_inode = NULL;
 714        struct buffer_head *orphan_dir_bh = NULL;
 715        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 716        struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data;
 717
 718        if (!(OCFS2_I(inode)->ip_flags & OCFS2_INODE_SKIP_ORPHAN_DIR)) {
 719                orphaned_slot = le16_to_cpu(di->i_orphaned_slot);
 720
 721                status = ocfs2_check_orphan_recovery_state(osb, orphaned_slot);
 722                if (status)
 723                        return status;
 724
 725                orphan_dir_inode = ocfs2_get_system_file_inode(osb,
 726                                                               ORPHAN_DIR_SYSTEM_INODE,
 727                                                               orphaned_slot);
 728                if (!orphan_dir_inode) {
 729                        status = -EEXIST;
 730                        mlog_errno(status);
 731                        goto bail;
 732                }
 733
 734                /* Lock the orphan dir. The lock will be held for the entire
 735                 * delete_inode operation. We do this now to avoid races with
 736                 * recovery completion on other nodes. */
 737                mutex_lock(&orphan_dir_inode->i_mutex);
 738                status = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
 739                if (status < 0) {
 740                        mutex_unlock(&orphan_dir_inode->i_mutex);
 741
 742                        mlog_errno(status);
 743                        goto bail;
 744                }
 745        }
 746
 747        /* we do this while holding the orphan dir lock because we
 748         * don't want recovery being run from another node to try an
 749         * inode delete underneath us -- this will result in two nodes
 750         * truncating the same file! */
 751        status = ocfs2_truncate_for_delete(osb, inode, di_bh);
 752        if (status < 0) {
 753                mlog_errno(status);
 754                goto bail_unlock_dir;
 755        }
 756
 757        /* Remove any dir index tree */
 758        if (S_ISDIR(inode->i_mode)) {
 759                status = ocfs2_dx_dir_truncate(inode, di_bh);
 760                if (status) {
 761                        mlog_errno(status);
 762                        goto bail_unlock_dir;
 763                }
 764        }
 765
 766        /*Free extended attribute resources associated with this inode.*/
 767        status = ocfs2_xattr_remove(inode, di_bh);
 768        if (status < 0) {
 769                mlog_errno(status);
 770                goto bail_unlock_dir;
 771        }
 772
 773        status = ocfs2_remove_refcount_tree(inode, di_bh);
 774        if (status < 0) {
 775                mlog_errno(status);
 776                goto bail_unlock_dir;
 777        }
 778
 779        status = ocfs2_remove_inode(inode, di_bh, orphan_dir_inode,
 780                                    orphan_dir_bh);
 781        if (status < 0)
 782                mlog_errno(status);
 783
 784bail_unlock_dir:
 785        if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SKIP_ORPHAN_DIR)
 786                return status;
 787
 788        ocfs2_inode_unlock(orphan_dir_inode, 1);
 789        mutex_unlock(&orphan_dir_inode->i_mutex);
 790        brelse(orphan_dir_bh);
 791bail:
 792        iput(orphan_dir_inode);
 793        ocfs2_signal_wipe_completion(osb, orphaned_slot);
 794
 795        return status;
 796}
 797
 798/* There is a series of simple checks that should be done before a
 799 * trylock is even considered. Encapsulate those in this function. */
 800static int ocfs2_inode_is_valid_to_delete(struct inode *inode)
 801{
 802        int ret = 0;
 803        struct ocfs2_inode_info *oi = OCFS2_I(inode);
 804        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 805
 806        trace_ocfs2_inode_is_valid_to_delete(current, osb->dc_task,
 807                                             (unsigned long long)oi->ip_blkno,
 808                                             oi->ip_flags);
 809
 810        /* We shouldn't be getting here for the root directory
 811         * inode.. */
 812        if (inode == osb->root_inode) {
 813                mlog(ML_ERROR, "Skipping delete of root inode.\n");
 814                goto bail;
 815        }
 816
 817        /* If we're coming from downconvert_thread we can't go into our own
 818         * voting [hello, deadlock city!], so unforuntately we just
 819         * have to skip deleting this guy. That's OK though because
 820         * the node who's doing the actual deleting should handle it
 821         * anyway. */
 822        if (current == osb->dc_task)
 823                goto bail;
 824
 825        spin_lock(&oi->ip_lock);
 826        /* OCFS2 *never* deletes system files. This should technically
 827         * never get here as system file inodes should always have a
 828         * positive link count. */
 829        if (oi->ip_flags & OCFS2_INODE_SYSTEM_FILE) {
 830                mlog(ML_ERROR, "Skipping delete of system file %llu\n",
 831                     (unsigned long long)oi->ip_blkno);
 832                goto bail_unlock;
 833        }
 834
 835        /* If we have allowd wipe of this inode for another node, it
 836         * will be marked here so we can safely skip it. Recovery will
 837         * cleanup any inodes we might inadvertently skip here. */
 838        if (oi->ip_flags & OCFS2_INODE_SKIP_DELETE)
 839                goto bail_unlock;
 840
 841        ret = 1;
 842bail_unlock:
 843        spin_unlock(&oi->ip_lock);
 844bail:
 845        return ret;
 846}
 847
 848/* Query the cluster to determine whether we should wipe an inode from
 849 * disk or not.
 850 *
 851 * Requires the inode to have the cluster lock. */
 852static int ocfs2_query_inode_wipe(struct inode *inode,
 853                                  struct buffer_head *di_bh,
 854                                  int *wipe)
 855{
 856        int status = 0, reason = 0;
 857        struct ocfs2_inode_info *oi = OCFS2_I(inode);
 858        struct ocfs2_dinode *di;
 859
 860        *wipe = 0;
 861
 862        trace_ocfs2_query_inode_wipe_begin((unsigned long long)oi->ip_blkno,
 863                                           inode->i_nlink);
 864
 865        /* While we were waiting for the cluster lock in
 866         * ocfs2_delete_inode, another node might have asked to delete
 867         * the inode. Recheck our flags to catch this. */
 868        if (!ocfs2_inode_is_valid_to_delete(inode)) {
 869                reason = 1;
 870                goto bail;
 871        }
 872
 873        /* Now that we have an up to date inode, we can double check
 874         * the link count. */
 875        if (inode->i_nlink)
 876                goto bail;
 877
 878        /* Do some basic inode verification... */
 879        di = (struct ocfs2_dinode *) di_bh->b_data;
 880        if (!(di->i_flags & cpu_to_le32(OCFS2_ORPHANED_FL)) &&
 881            !(oi->ip_flags & OCFS2_INODE_SKIP_ORPHAN_DIR)) {
 882                /*
 883                 * Inodes in the orphan dir must have ORPHANED_FL.  The only
 884                 * inodes that come back out of the orphan dir are reflink
 885                 * targets. A reflink target may be moved out of the orphan
 886                 * dir between the time we scan the directory and the time we
 887                 * process it. This would lead to HAS_REFCOUNT_FL being set but
 888                 * ORPHANED_FL not.
 889                 */
 890                if (di->i_dyn_features & cpu_to_le16(OCFS2_HAS_REFCOUNT_FL)) {
 891                        reason = 2;
 892                        goto bail;
 893                }
 894
 895                /* for lack of a better error? */
 896                status = -EEXIST;
 897                mlog(ML_ERROR,
 898                     "Inode %llu (on-disk %llu) not orphaned! "
 899                     "Disk flags  0x%x, inode flags 0x%x\n",
 900                     (unsigned long long)oi->ip_blkno,
 901                     (unsigned long long)le64_to_cpu(di->i_blkno),
 902                     le32_to_cpu(di->i_flags), oi->ip_flags);
 903                goto bail;
 904        }
 905
 906        /* has someone already deleted us?! baaad... */
 907        if (di->i_dtime) {
 908                status = -EEXIST;
 909                mlog_errno(status);
 910                goto bail;
 911        }
 912
 913        /*
 914         * This is how ocfs2 determines whether an inode is still live
 915         * within the cluster. Every node takes a shared read lock on
 916         * the inode open lock in ocfs2_read_locked_inode(). When we
 917         * get to ->delete_inode(), each node tries to convert it's
 918         * lock to an exclusive. Trylocks are serialized by the inode
 919         * meta data lock. If the upconvert succeeds, we know the inode
 920         * is no longer live and can be deleted.
 921         *
 922         * Though we call this with the meta data lock held, the
 923         * trylock keeps us from ABBA deadlock.
 924         */
 925        status = ocfs2_try_open_lock(inode, 1);
 926        if (status == -EAGAIN) {
 927                status = 0;
 928                reason = 3;
 929                goto bail;
 930        }
 931        if (status < 0) {
 932                mlog_errno(status);
 933                goto bail;
 934        }
 935
 936        *wipe = 1;
 937        trace_ocfs2_query_inode_wipe_succ(le16_to_cpu(di->i_orphaned_slot));
 938
 939bail:
 940        trace_ocfs2_query_inode_wipe_end(status, reason);
 941        return status;
 942}
 943
 944/* Support function for ocfs2_delete_inode. Will help us keep the
 945 * inode data in a consistent state for clear_inode. Always truncates
 946 * pages, optionally sync's them first. */
 947static void ocfs2_cleanup_delete_inode(struct inode *inode,
 948                                       int sync_data)
 949{
 950        trace_ocfs2_cleanup_delete_inode(
 951                (unsigned long long)OCFS2_I(inode)->ip_blkno, sync_data);
 952        if (sync_data)
 953                filemap_write_and_wait(inode->i_mapping);
 954        truncate_inode_pages(&inode->i_data, 0);
 955}
 956
 957static void ocfs2_delete_inode(struct inode *inode)
 958{
 959        int wipe, status;
 960        sigset_t oldset;
 961        struct buffer_head *di_bh = NULL;
 962
 963        trace_ocfs2_delete_inode(inode->i_ino,
 964                                 (unsigned long long)OCFS2_I(inode)->ip_blkno,
 965                                 is_bad_inode(inode));
 966
 967        /* When we fail in read_inode() we mark inode as bad. The second test
 968         * catches the case when inode allocation fails before allocating
 969         * a block for inode. */
 970        if (is_bad_inode(inode) || !OCFS2_I(inode)->ip_blkno)
 971                goto bail;
 972
 973        dquot_initialize(inode);
 974
 975        if (!ocfs2_inode_is_valid_to_delete(inode)) {
 976                /* It's probably not necessary to truncate_inode_pages
 977                 * here but we do it for safety anyway (it will most
 978                 * likely be a no-op anyway) */
 979                ocfs2_cleanup_delete_inode(inode, 0);
 980                goto bail;
 981        }
 982
 983        /* We want to block signals in delete_inode as the lock and
 984         * messaging paths may return us -ERESTARTSYS. Which would
 985         * cause us to exit early, resulting in inodes being orphaned
 986         * forever. */
 987        ocfs2_block_signals(&oldset);
 988
 989        /*
 990         * Synchronize us against ocfs2_get_dentry. We take this in
 991         * shared mode so that all nodes can still concurrently
 992         * process deletes.
 993         */
 994        status = ocfs2_nfs_sync_lock(OCFS2_SB(inode->i_sb), 0);
 995        if (status < 0) {
 996                mlog(ML_ERROR, "getting nfs sync lock(PR) failed %d\n", status);
 997                ocfs2_cleanup_delete_inode(inode, 0);
 998                goto bail_unblock;
 999        }
1000        /* Lock down the inode. This gives us an up to date view of
1001         * it's metadata (for verification), and allows us to
1002         * serialize delete_inode on multiple nodes.
1003         *
1004         * Even though we might be doing a truncate, we don't take the
1005         * allocation lock here as it won't be needed - nobody will
1006         * have the file open.
1007         */
1008        status = ocfs2_inode_lock(inode, &di_bh, 1);
1009        if (status < 0) {
1010                if (status != -ENOENT)
1011                        mlog_errno(status);
1012                ocfs2_cleanup_delete_inode(inode, 0);
1013                goto bail_unlock_nfs_sync;
1014        }
1015
1016        /* Query the cluster. This will be the final decision made
1017         * before we go ahead and wipe the inode. */
1018        status = ocfs2_query_inode_wipe(inode, di_bh, &wipe);
1019        if (!wipe || status < 0) {
1020                /* Error and remote inode busy both mean we won't be
1021                 * removing the inode, so they take almost the same
1022                 * path. */
1023                if (status < 0)
1024                        mlog_errno(status);
1025
1026                /* Someone in the cluster has disallowed a wipe of
1027                 * this inode, or it was never completely
1028                 * orphaned. Write out the pages and exit now. */
1029                ocfs2_cleanup_delete_inode(inode, 1);
1030                goto bail_unlock_inode;
1031        }
1032
1033        ocfs2_cleanup_delete_inode(inode, 0);
1034
1035        status = ocfs2_wipe_inode(inode, di_bh);
1036        if (status < 0) {
1037                if (status != -EDEADLK)
1038                        mlog_errno(status);
1039                goto bail_unlock_inode;
1040        }
1041
1042        /*
1043         * Mark the inode as successfully deleted.
1044         *
1045         * This is important for ocfs2_clear_inode() as it will check
1046         * this flag and skip any checkpointing work
1047         *
1048         * ocfs2_stuff_meta_lvb() also uses this flag to invalidate
1049         * the LVB for other nodes.
1050         */
1051        OCFS2_I(inode)->ip_flags |= OCFS2_INODE_DELETED;
1052
1053bail_unlock_inode:
1054        ocfs2_inode_unlock(inode, 1);
1055        brelse(di_bh);
1056
1057bail_unlock_nfs_sync:
1058        ocfs2_nfs_sync_unlock(OCFS2_SB(inode->i_sb), 0);
1059
1060bail_unblock:
1061        ocfs2_unblock_signals(&oldset);
1062bail:
1063        return;
1064}
1065
1066static void ocfs2_clear_inode(struct inode *inode)
1067{
1068        int status;
1069        struct ocfs2_inode_info *oi = OCFS2_I(inode);
1070
1071        clear_inode(inode);
1072        trace_ocfs2_clear_inode((unsigned long long)oi->ip_blkno,
1073                                inode->i_nlink);
1074
1075        mlog_bug_on_msg(OCFS2_SB(inode->i_sb) == NULL,
1076                        "Inode=%lu\n", inode->i_ino);
1077
1078        dquot_drop(inode);
1079
1080        /* To preven remote deletes we hold open lock before, now it
1081         * is time to unlock PR and EX open locks. */
1082        ocfs2_open_unlock(inode);
1083
1084        /* Do these before all the other work so that we don't bounce
1085         * the downconvert thread while waiting to destroy the locks. */
1086        ocfs2_mark_lockres_freeing(&oi->ip_rw_lockres);
1087        ocfs2_mark_lockres_freeing(&oi->ip_inode_lockres);
1088        ocfs2_mark_lockres_freeing(&oi->ip_open_lockres);
1089
1090        ocfs2_resv_discard(&OCFS2_SB(inode->i_sb)->osb_la_resmap,
1091                           &oi->ip_la_data_resv);
1092        ocfs2_resv_init_once(&oi->ip_la_data_resv);
1093
1094        /* We very well may get a clear_inode before all an inodes
1095         * metadata has hit disk. Of course, we can't drop any cluster
1096         * locks until the journal has finished with it. The only
1097         * exception here are successfully wiped inodes - their
1098         * metadata can now be considered to be part of the system
1099         * inodes from which it came. */
1100        if (!(OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED))
1101                ocfs2_checkpoint_inode(inode);
1102
1103        mlog_bug_on_msg(!list_empty(&oi->ip_io_markers),
1104                        "Clear inode of %llu, inode has io markers\n",
1105                        (unsigned long long)oi->ip_blkno);
1106
1107        ocfs2_extent_map_trunc(inode, 0);
1108
1109        status = ocfs2_drop_inode_locks(inode);
1110        if (status < 0)
1111                mlog_errno(status);
1112
1113        ocfs2_lock_res_free(&oi->ip_rw_lockres);
1114        ocfs2_lock_res_free(&oi->ip_inode_lockres);
1115        ocfs2_lock_res_free(&oi->ip_open_lockres);
1116
1117        ocfs2_metadata_cache_exit(INODE_CACHE(inode));
1118
1119        mlog_bug_on_msg(INODE_CACHE(inode)->ci_num_cached,
1120                        "Clear inode of %llu, inode has %u cache items\n",
1121                        (unsigned long long)oi->ip_blkno,
1122                        INODE_CACHE(inode)->ci_num_cached);
1123
1124        mlog_bug_on_msg(!(INODE_CACHE(inode)->ci_flags & OCFS2_CACHE_FL_INLINE),
1125                        "Clear inode of %llu, inode has a bad flag\n",
1126                        (unsigned long long)oi->ip_blkno);
1127
1128        mlog_bug_on_msg(spin_is_locked(&oi->ip_lock),
1129                        "Clear inode of %llu, inode is locked\n",
1130                        (unsigned long long)oi->ip_blkno);
1131
1132        mlog_bug_on_msg(!mutex_trylock(&oi->ip_io_mutex),
1133                        "Clear inode of %llu, io_mutex is locked\n",
1134                        (unsigned long long)oi->ip_blkno);
1135        mutex_unlock(&oi->ip_io_mutex);
1136
1137        /*
1138         * down_trylock() returns 0, down_write_trylock() returns 1
1139         * kernel 1, world 0
1140         */
1141        mlog_bug_on_msg(!down_write_trylock(&oi->ip_alloc_sem),
1142                        "Clear inode of %llu, alloc_sem is locked\n",
1143                        (unsigned long long)oi->ip_blkno);
1144        up_write(&oi->ip_alloc_sem);
1145
1146        mlog_bug_on_msg(oi->ip_open_count,
1147                        "Clear inode of %llu has open count %d\n",
1148                        (unsigned long long)oi->ip_blkno, oi->ip_open_count);
1149
1150        /* Clear all other flags. */
1151        oi->ip_flags = 0;
1152        oi->ip_dir_start_lookup = 0;
1153        oi->ip_blkno = 0ULL;
1154
1155        /*
1156         * ip_jinode is used to track txns against this inode. We ensure that
1157         * the journal is flushed before journal shutdown. Thus it is safe to
1158         * have inodes get cleaned up after journal shutdown.
1159         */
1160        jbd2_journal_release_jbd_inode(OCFS2_SB(inode->i_sb)->journal->j_journal,
1161                                       &oi->ip_jinode);
1162}
1163
1164void ocfs2_evict_inode(struct inode *inode)
1165{
1166        if (!inode->i_nlink ||
1167            (OCFS2_I(inode)->ip_flags & OCFS2_INODE_MAYBE_ORPHANED)) {
1168                ocfs2_delete_inode(inode);
1169        } else {
1170                truncate_inode_pages(&inode->i_data, 0);
1171        }
1172        ocfs2_clear_inode(inode);
1173}
1174
1175/* Called under inode_lock, with no more references on the
1176 * struct inode, so it's safe here to check the flags field
1177 * and to manipulate i_nlink without any other locks. */
1178int ocfs2_drop_inode(struct inode *inode)
1179{
1180        struct ocfs2_inode_info *oi = OCFS2_I(inode);
1181        int res;
1182
1183        trace_ocfs2_drop_inode((unsigned long long)oi->ip_blkno,
1184                                inode->i_nlink, oi->ip_flags);
1185
1186        if (oi->ip_flags & OCFS2_INODE_MAYBE_ORPHANED)
1187                res = 1;
1188        else
1189                res = generic_drop_inode(inode);
1190
1191        return res;
1192}
1193
1194/*
1195 * This is called from our getattr.
1196 */
1197int ocfs2_inode_revalidate(struct dentry *dentry)
1198{
1199        struct inode *inode = dentry->d_inode;
1200        int status = 0;
1201
1202        trace_ocfs2_inode_revalidate(inode,
1203                inode ? (unsigned long long)OCFS2_I(inode)->ip_blkno : 0ULL,
1204                inode ? (unsigned long long)OCFS2_I(inode)->ip_flags : 0);
1205
1206        if (!inode) {
1207                status = -ENOENT;
1208                goto bail;
1209        }
1210
1211        spin_lock(&OCFS2_I(inode)->ip_lock);
1212        if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) {
1213                spin_unlock(&OCFS2_I(inode)->ip_lock);
1214                status = -ENOENT;
1215                goto bail;
1216        }
1217        spin_unlock(&OCFS2_I(inode)->ip_lock);
1218
1219        /* Let ocfs2_inode_lock do the work of updating our struct
1220         * inode for us. */
1221        status = ocfs2_inode_lock(inode, NULL, 0);
1222        if (status < 0) {
1223                if (status != -ENOENT)
1224                        mlog_errno(status);
1225                goto bail;
1226        }
1227        ocfs2_inode_unlock(inode, 0);
1228bail:
1229        return status;
1230}
1231
1232/*
1233 * Updates a disk inode from a
1234 * struct inode.
1235 * Only takes ip_lock.
1236 */
1237int ocfs2_mark_inode_dirty(handle_t *handle,
1238                           struct inode *inode,
1239                           struct buffer_head *bh)
1240{
1241        int status;
1242        struct ocfs2_dinode *fe = (struct ocfs2_dinode *) bh->b_data;
1243
1244        trace_ocfs2_mark_inode_dirty((unsigned long long)OCFS2_I(inode)->ip_blkno);
1245
1246        status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
1247                                         OCFS2_JOURNAL_ACCESS_WRITE);
1248        if (status < 0) {
1249                mlog_errno(status);
1250                goto leave;
1251        }
1252
1253        spin_lock(&OCFS2_I(inode)->ip_lock);
1254        fe->i_clusters = cpu_to_le32(OCFS2_I(inode)->ip_clusters);
1255        ocfs2_get_inode_flags(OCFS2_I(inode));
1256        fe->i_attr = cpu_to_le32(OCFS2_I(inode)->ip_attr);
1257        fe->i_dyn_features = cpu_to_le16(OCFS2_I(inode)->ip_dyn_features);
1258        spin_unlock(&OCFS2_I(inode)->ip_lock);
1259
1260        fe->i_size = cpu_to_le64(i_size_read(inode));
1261        ocfs2_set_links_count(fe, inode->i_nlink);
1262        fe->i_uid = cpu_to_le32(inode->i_uid);
1263        fe->i_gid = cpu_to_le32(inode->i_gid);
1264        fe->i_mode = cpu_to_le16(inode->i_mode);
1265        fe->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
1266        fe->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
1267        fe->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
1268        fe->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
1269        fe->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
1270        fe->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
1271
1272        ocfs2_journal_dirty(handle, bh);
1273leave:
1274        return status;
1275}
1276
1277/*
1278 *
1279 * Updates a struct inode from a disk inode.
1280 * does no i/o, only takes ip_lock.
1281 */
1282void ocfs2_refresh_inode(struct inode *inode,
1283                         struct ocfs2_dinode *fe)
1284{
1285        spin_lock(&OCFS2_I(inode)->ip_lock);
1286
1287        OCFS2_I(inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
1288        OCFS2_I(inode)->ip_attr = le32_to_cpu(fe->i_attr);
1289        OCFS2_I(inode)->ip_dyn_features = le16_to_cpu(fe->i_dyn_features);
1290        ocfs2_set_inode_flags(inode);
1291        i_size_write(inode, le64_to_cpu(fe->i_size));
1292        set_nlink(inode, ocfs2_read_links_count(fe));
1293        inode->i_uid = le32_to_cpu(fe->i_uid);
1294        inode->i_gid = le32_to_cpu(fe->i_gid);
1295        inode->i_mode = le16_to_cpu(fe->i_mode);
1296        if (S_ISLNK(inode->i_mode) && le32_to_cpu(fe->i_clusters) == 0)
1297                inode->i_blocks = 0;
1298        else
1299                inode->i_blocks = ocfs2_inode_sector_count(inode);
1300        inode->i_atime.tv_sec = le64_to_cpu(fe->i_atime);
1301        inode->i_atime.tv_nsec = le32_to_cpu(fe->i_atime_nsec);
1302        inode->i_mtime.tv_sec = le64_to_cpu(fe->i_mtime);
1303        inode->i_mtime.tv_nsec = le32_to_cpu(fe->i_mtime_nsec);
1304        inode->i_ctime.tv_sec = le64_to_cpu(fe->i_ctime);
1305        inode->i_ctime.tv_nsec = le32_to_cpu(fe->i_ctime_nsec);
1306
1307        spin_unlock(&OCFS2_I(inode)->ip_lock);
1308}
1309
1310int ocfs2_validate_inode_block(struct super_block *sb,
1311                               struct buffer_head *bh)
1312{
1313        int rc;
1314        struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
1315
1316        trace_ocfs2_validate_inode_block((unsigned long long)bh->b_blocknr);
1317
1318        BUG_ON(!buffer_uptodate(bh));
1319
1320        /*
1321         * If the ecc fails, we return the error but otherwise
1322         * leave the filesystem running.  We know any error is
1323         * local to this block.
1324         */
1325        rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &di->i_check);
1326        if (rc) {
1327                mlog(ML_ERROR, "Checksum failed for dinode %llu\n",
1328                     (unsigned long long)bh->b_blocknr);
1329                goto bail;
1330        }
1331
1332        /*
1333         * Errors after here are fatal.
1334         */
1335
1336        rc = -EINVAL;
1337
1338        if (!OCFS2_IS_VALID_DINODE(di)) {
1339                ocfs2_error(sb, "Invalid dinode #%llu: signature = %.*s\n",
1340                            (unsigned long long)bh->b_blocknr, 7,
1341                            di->i_signature);
1342                goto bail;
1343        }
1344
1345        if (le64_to_cpu(di->i_blkno) != bh->b_blocknr) {
1346                ocfs2_error(sb, "Invalid dinode #%llu: i_blkno is %llu\n",
1347                            (unsigned long long)bh->b_blocknr,
1348                            (unsigned long long)le64_to_cpu(di->i_blkno));
1349                goto bail;
1350        }
1351
1352        if (!(di->i_flags & cpu_to_le32(OCFS2_VALID_FL))) {
1353                ocfs2_error(sb,
1354                            "Invalid dinode #%llu: OCFS2_VALID_FL not set\n",
1355                            (unsigned long long)bh->b_blocknr);
1356                goto bail;
1357        }
1358
1359        if (le32_to_cpu(di->i_fs_generation) !=
1360            OCFS2_SB(sb)->fs_generation) {
1361                ocfs2_error(sb,
1362                            "Invalid dinode #%llu: fs_generation is %u\n",
1363                            (unsigned long long)bh->b_blocknr,
1364                            le32_to_cpu(di->i_fs_generation));
1365                goto bail;
1366        }
1367
1368        rc = 0;
1369
1370bail:
1371        return rc;
1372}
1373
1374int ocfs2_read_inode_block_full(struct inode *inode, struct buffer_head **bh,
1375                                int flags)
1376{
1377        int rc;
1378        struct buffer_head *tmp = *bh;
1379
1380        rc = ocfs2_read_blocks(INODE_CACHE(inode), OCFS2_I(inode)->ip_blkno,
1381                               1, &tmp, flags, ocfs2_validate_inode_block);
1382
1383        /* If ocfs2_read_blocks() got us a new bh, pass it up. */
1384        if (!rc && !*bh)
1385                *bh = tmp;
1386
1387        return rc;
1388}
1389
1390int ocfs2_read_inode_block(struct inode *inode, struct buffer_head **bh)
1391{
1392        return ocfs2_read_inode_block_full(inode, bh, 0);
1393}
1394
1395
1396static u64 ocfs2_inode_cache_owner(struct ocfs2_caching_info *ci)
1397{
1398        struct ocfs2_inode_info *oi = cache_info_to_inode(ci);
1399
1400        return oi->ip_blkno;
1401}
1402
1403static struct super_block *ocfs2_inode_cache_get_super(struct ocfs2_caching_info *ci)
1404{
1405        struct ocfs2_inode_info *oi = cache_info_to_inode(ci);
1406
1407        return oi->vfs_inode.i_sb;
1408}
1409
1410static void ocfs2_inode_cache_lock(struct ocfs2_caching_info *ci)
1411{
1412        struct ocfs2_inode_info *oi = cache_info_to_inode(ci);
1413
1414        spin_lock(&oi->ip_lock);
1415}
1416
1417static void ocfs2_inode_cache_unlock(struct ocfs2_caching_info *ci)
1418{
1419        struct ocfs2_inode_info *oi = cache_info_to_inode(ci);
1420
1421        spin_unlock(&oi->ip_lock);
1422}
1423
1424static void ocfs2_inode_cache_io_lock(struct ocfs2_caching_info *ci)
1425{
1426        struct ocfs2_inode_info *oi = cache_info_to_inode(ci);
1427
1428        mutex_lock(&oi->ip_io_mutex);
1429}
1430
1431static void ocfs2_inode_cache_io_unlock(struct ocfs2_caching_info *ci)
1432{
1433        struct ocfs2_inode_info *oi = cache_info_to_inode(ci);
1434
1435        mutex_unlock(&oi->ip_io_mutex);
1436}
1437
1438const struct ocfs2_caching_operations ocfs2_inode_caching_ops = {
1439        .co_owner               = ocfs2_inode_cache_owner,
1440        .co_get_super           = ocfs2_inode_cache_get_super,
1441        .co_cache_lock          = ocfs2_inode_cache_lock,
1442        .co_cache_unlock        = ocfs2_inode_cache_unlock,
1443        .co_io_lock             = ocfs2_inode_cache_io_lock,
1444        .co_io_unlock           = ocfs2_inode_cache_io_unlock,
1445};
1446
1447
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