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inode.c

/* -*- mode: c; c-basic-offset: 8; -*-
 * vim: noexpandtab sw=8 ts=8 sts=0:
 *
 * inode.c
 *
 * vfs' aops, fops, dops and iops
 *
 * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 */

#include <linux/fs.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/highmem.h>
#include <linux/pagemap.h>

#include <asm/byteorder.h>

#define MLOG_MASK_PREFIX ML_INODE
#include <cluster/masklog.h>

#include "ocfs2.h"

#include "alloc.h"
#include "dlmglue.h"
#include "extent_map.h"
#include "file.h"
#include "heartbeat.h"
#include "inode.h"
#include "journal.h"
#include "namei.h"
#include "suballoc.h"
#include "super.h"
#include "symlink.h"
#include "sysfile.h"
#include "uptodate.h"
#include "vote.h"

#include "buffer_head_io.h"

struct ocfs2_find_inode_args
{
      u64         fi_blkno;
      unsigned long     fi_ino;
      unsigned int      fi_flags;
};

static int ocfs2_read_locked_inode(struct inode *inode,
                           struct ocfs2_find_inode_args *args);
static int ocfs2_init_locked_inode(struct inode *inode, void *opaque);
static int ocfs2_find_actor(struct inode *inode, void *opaque);
static int ocfs2_truncate_for_delete(struct ocfs2_super *osb,
                            struct inode *inode,
                            struct buffer_head *fe_bh);

void ocfs2_set_inode_flags(struct inode *inode)
{
      unsigned int flags = OCFS2_I(inode)->ip_attr;

      inode->i_flags &= ~(S_IMMUTABLE |
            S_SYNC | S_APPEND | S_NOATIME | S_DIRSYNC);

      if (flags & OCFS2_IMMUTABLE_FL)
            inode->i_flags |= S_IMMUTABLE;

      if (flags & OCFS2_SYNC_FL)
            inode->i_flags |= S_SYNC;
      if (flags & OCFS2_APPEND_FL)
            inode->i_flags |= S_APPEND;
      if (flags & OCFS2_NOATIME_FL)
            inode->i_flags |= S_NOATIME;
      if (flags & OCFS2_DIRSYNC_FL)
            inode->i_flags |= S_DIRSYNC;
}

/* Propagate flags from i_flags to OCFS2_I(inode)->ip_attr */
void ocfs2_get_inode_flags(struct ocfs2_inode_info *oi)
{
      unsigned int flags = oi->vfs_inode.i_flags;

      oi->ip_attr &= ~(OCFS2_SYNC_FL|OCFS2_APPEND_FL|
                  OCFS2_IMMUTABLE_FL|OCFS2_NOATIME_FL|OCFS2_DIRSYNC_FL);
      if (flags & S_SYNC)
            oi->ip_attr |= OCFS2_SYNC_FL;
      if (flags & S_APPEND)
            oi->ip_attr |= OCFS2_APPEND_FL;
      if (flags & S_IMMUTABLE)
            oi->ip_attr |= OCFS2_IMMUTABLE_FL;
      if (flags & S_NOATIME)
            oi->ip_attr |= OCFS2_NOATIME_FL;
      if (flags & S_DIRSYNC)
            oi->ip_attr |= OCFS2_DIRSYNC_FL;
}

struct inode *ocfs2_iget(struct ocfs2_super *osb, u64 blkno, int flags)
{
      struct inode *inode = NULL;
      struct super_block *sb = osb->sb;
      struct ocfs2_find_inode_args args;

      mlog_entry("(blkno = %llu)\n", (unsigned long long)blkno);

      /* Ok. By now we've either got the offsets passed to us by the
       * caller, or we just pulled them off the bh. Lets do some
       * sanity checks to make sure they're OK. */
      if (blkno == 0) {
            inode = ERR_PTR(-EINVAL);
            mlog_errno(PTR_ERR(inode));
            goto bail;
      }

      args.fi_blkno = blkno;
      args.fi_flags = flags;
      args.fi_ino = ino_from_blkno(sb, blkno);

      inode = iget5_locked(sb, args.fi_ino, ocfs2_find_actor,
                       ocfs2_init_locked_inode, &args);
      /* inode was *not* in the inode cache. 2.6.x requires
       * us to do our own read_inode call and unlock it
       * afterwards. */
      if (inode && inode->i_state & I_NEW) {
            mlog(0, "Inode was not in inode cache, reading it.\n");
            ocfs2_read_locked_inode(inode, &args);
            unlock_new_inode(inode);
      }
      if (inode == NULL) {
            inode = ERR_PTR(-ENOMEM);
            mlog_errno(PTR_ERR(inode));
            goto bail;
      }
      if (is_bad_inode(inode)) {
            iput(inode);
            inode = ERR_PTR(-ESTALE);
            goto bail;
      }

bail:
      if (!IS_ERR(inode)) {
            mlog(0, "returning inode with number %llu\n",
                 (unsigned long long)OCFS2_I(inode)->ip_blkno);
            mlog_exit_ptr(inode);
      }

      return inode;
}


/*
 * here's how inodes get read from disk:
 * iget5_locked -> find_actor -> OCFS2_FIND_ACTOR
 * found? : return the in-memory inode
 * not found? : get_new_inode -> OCFS2_INIT_LOCKED_INODE
 */

static int ocfs2_find_actor(struct inode *inode, void *opaque)
{
      struct ocfs2_find_inode_args *args = NULL;
      struct ocfs2_inode_info *oi = OCFS2_I(inode);
      int ret = 0;

      mlog_entry("(0x%p, %lu, 0x%p)\n", inode, inode->i_ino, opaque);

      args = opaque;

      mlog_bug_on_msg(!inode, "No inode in find actor!\n");

      if (oi->ip_blkno != args->fi_blkno)
            goto bail;

      ret = 1;
bail:
      mlog_exit(ret);
      return ret;
}

/*
 * initialize the new inode, but don't do anything that would cause
 * us to sleep.
 * return 0 on success, 1 on failure
 */
static int ocfs2_init_locked_inode(struct inode *inode, void *opaque)
{
      struct ocfs2_find_inode_args *args = opaque;

      mlog_entry("inode = %p, opaque = %p\n", inode, opaque);

      inode->i_ino = args->fi_ino;
      OCFS2_I(inode)->ip_blkno = args->fi_blkno;

      mlog_exit(0);
      return 0;
}

int ocfs2_populate_inode(struct inode *inode, struct ocfs2_dinode *fe,
                   int create_ino)
{
      struct super_block *sb;
      struct ocfs2_super *osb;
      int status = -EINVAL;

      mlog_entry("(0x%p, size:%llu)\n", inode,
               (unsigned long long)le64_to_cpu(fe->i_size));

      sb = inode->i_sb;
      osb = OCFS2_SB(sb);

      /* this means that read_inode cannot create a superblock inode
       * today.  change if needed. */
      if (!OCFS2_IS_VALID_DINODE(fe) ||
          !(fe->i_flags & cpu_to_le32(OCFS2_VALID_FL))) {
            mlog(0, "Invalid dinode: i_ino=%lu, i_blkno=%llu, "
                 "signature = %.*s, flags = 0x%x\n",
                 inode->i_ino,
                 (unsigned long long)le64_to_cpu(fe->i_blkno), 7,
                 fe->i_signature, le32_to_cpu(fe->i_flags));
            goto bail;
      }

      if (le32_to_cpu(fe->i_fs_generation) != osb->fs_generation) {
            mlog(ML_ERROR, "file entry generation does not match "
                 "superblock! osb->fs_generation=%x, "
                 "fe->i_fs_generation=%x\n",
                 osb->fs_generation, le32_to_cpu(fe->i_fs_generation));
            goto bail;
      }

      OCFS2_I(inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
      OCFS2_I(inode)->ip_attr = le32_to_cpu(fe->i_attr);
      OCFS2_I(inode)->ip_dyn_features = le16_to_cpu(fe->i_dyn_features);

      inode->i_version = 1;
      inode->i_generation = le32_to_cpu(fe->i_generation);
      inode->i_rdev = huge_decode_dev(le64_to_cpu(fe->id1.dev1.i_rdev));
      inode->i_mode = le16_to_cpu(fe->i_mode);
      inode->i_uid = le32_to_cpu(fe->i_uid);
      inode->i_gid = le32_to_cpu(fe->i_gid);

      /* Fast symlinks will have i_size but no allocated clusters. */
      if (S_ISLNK(inode->i_mode) && !fe->i_clusters)
            inode->i_blocks = 0;
      else
            inode->i_blocks = ocfs2_inode_sector_count(inode);
      inode->i_mapping->a_ops = &ocfs2_aops;
      inode->i_atime.tv_sec = le64_to_cpu(fe->i_atime);
      inode->i_atime.tv_nsec = le32_to_cpu(fe->i_atime_nsec);
      inode->i_mtime.tv_sec = le64_to_cpu(fe->i_mtime);
      inode->i_mtime.tv_nsec = le32_to_cpu(fe->i_mtime_nsec);
      inode->i_ctime.tv_sec = le64_to_cpu(fe->i_ctime);
      inode->i_ctime.tv_nsec = le32_to_cpu(fe->i_ctime_nsec);

      if (OCFS2_I(inode)->ip_blkno != le64_to_cpu(fe->i_blkno))
            mlog(ML_ERROR,
                 "ip_blkno %llu != i_blkno %llu!\n",
                 (unsigned long long)OCFS2_I(inode)->ip_blkno,
                 (unsigned long long)le64_to_cpu(fe->i_blkno));

      inode->i_nlink = le16_to_cpu(fe->i_links_count);

      if (fe->i_flags & cpu_to_le32(OCFS2_SYSTEM_FL))
            OCFS2_I(inode)->ip_flags |= OCFS2_INODE_SYSTEM_FILE;

      if (fe->i_flags & cpu_to_le32(OCFS2_LOCAL_ALLOC_FL)) {
            OCFS2_I(inode)->ip_flags |= OCFS2_INODE_BITMAP;
            mlog(0, "local alloc inode: i_ino=%lu\n", inode->i_ino);
      } else if (fe->i_flags & cpu_to_le32(OCFS2_BITMAP_FL)) {
            OCFS2_I(inode)->ip_flags |= OCFS2_INODE_BITMAP;
      } else if (fe->i_flags & cpu_to_le32(OCFS2_SUPER_BLOCK_FL)) {
            mlog(0, "superblock inode: i_ino=%lu\n", inode->i_ino);
            /* we can't actually hit this as read_inode can't
             * handle superblocks today ;-) */
            BUG();
      }

      switch (inode->i_mode & S_IFMT) {
          case S_IFREG:
                inode->i_fop = &ocfs2_fops;
                inode->i_op = &ocfs2_file_iops;
                i_size_write(inode, le64_to_cpu(fe->i_size));
                break;
          case S_IFDIR:
                inode->i_op = &ocfs2_dir_iops;
                inode->i_fop = &ocfs2_dops;
                i_size_write(inode, le64_to_cpu(fe->i_size));
                break;
          case S_IFLNK:
                if (ocfs2_inode_is_fast_symlink(inode))
                  inode->i_op = &ocfs2_fast_symlink_inode_operations;
                else
                  inode->i_op = &ocfs2_symlink_inode_operations;
                i_size_write(inode, le64_to_cpu(fe->i_size));
                break;
          default:
                inode->i_op = &ocfs2_special_file_iops;
                init_special_inode(inode, inode->i_mode,
                               inode->i_rdev);
                break;
      }

      if (create_ino) {
            inode->i_ino = ino_from_blkno(inode->i_sb,
                         le64_to_cpu(fe->i_blkno));

            /*
             * If we ever want to create system files from kernel,
             * the generation argument to
             * ocfs2_inode_lock_res_init() will have to change.
             */
            BUG_ON(le32_to_cpu(fe->i_flags) & OCFS2_SYSTEM_FL);

            ocfs2_inode_lock_res_init(&OCFS2_I(inode)->ip_meta_lockres,
                                OCFS2_LOCK_TYPE_META, 0, inode);

            ocfs2_inode_lock_res_init(&OCFS2_I(inode)->ip_open_lockres,
                                OCFS2_LOCK_TYPE_OPEN, 0, inode);
      }

      ocfs2_inode_lock_res_init(&OCFS2_I(inode)->ip_rw_lockres,
                          OCFS2_LOCK_TYPE_RW, inode->i_generation,
                          inode);

      ocfs2_inode_lock_res_init(&OCFS2_I(inode)->ip_data_lockres,
                          OCFS2_LOCK_TYPE_DATA, inode->i_generation,
                          inode);

      ocfs2_set_inode_flags(inode);

      status = 0;
bail:
      mlog_exit(status);
      return status;
}

static int ocfs2_read_locked_inode(struct inode *inode,
                           struct ocfs2_find_inode_args *args)
{
      struct super_block *sb;
      struct ocfs2_super *osb;
      struct ocfs2_dinode *fe;
      struct buffer_head *bh = NULL;
      int status, can_lock;
      u32 generation = 0;

      mlog_entry("(0x%p, 0x%p)\n", inode, args);

      status = -EINVAL;
      if (inode == NULL || inode->i_sb == NULL) {
            mlog(ML_ERROR, "bad inode\n");
            return status;
      }
      sb = inode->i_sb;
      osb = OCFS2_SB(sb);

      if (!args) {
            mlog(ML_ERROR, "bad inode args\n");
            make_bad_inode(inode);
            return status;
      }

      /*
       * To improve performance of cold-cache inode stats, we take
       * the cluster lock here if possible.
       *
       * Generally, OCFS2 never trusts the contents of an inode
       * unless it's holding a cluster lock, so taking it here isn't
       * a correctness issue as much as it is a performance
       * improvement.
       *
       * There are three times when taking the lock is not a good idea:
       *
       * 1) During startup, before we have initialized the DLM.
       *
       * 2) If we are reading certain system files which never get
       *    cluster locks (local alloc, truncate log).
       *
       * 3) If the process doing the iget() is responsible for
       *    orphan dir recovery. We're holding the orphan dir lock and
       *    can get into a deadlock with another process on another
       *    node in ->delete_inode().
       *
       * #1 and #2 can be simply solved by never taking the lock
       * here for system files (which are the only type we read
       * during mount). It's a heavier approach, but our main
       * concern is user-accesible files anyway.
       *
       * #3 works itself out because we'll eventually take the
       * cluster lock before trusting anything anyway.
       */
      can_lock = !(args->fi_flags & OCFS2_FI_FLAG_SYSFILE)
            && !(args->fi_flags & OCFS2_FI_FLAG_ORPHAN_RECOVERY)
            && !ocfs2_mount_local(osb);

      /*
       * To maintain backwards compatibility with older versions of
       * ocfs2-tools, we still store the generation value for system
       * files. The only ones that actually matter to userspace are
       * the journals, but it's easier and inexpensive to just flag
       * all system files similarly.
       */
      if (args->fi_flags & OCFS2_FI_FLAG_SYSFILE)
            generation = osb->fs_generation;

      ocfs2_inode_lock_res_init(&OCFS2_I(inode)->ip_meta_lockres,
                          OCFS2_LOCK_TYPE_META,
                          generation, inode);

      ocfs2_inode_lock_res_init(&OCFS2_I(inode)->ip_open_lockres,
                          OCFS2_LOCK_TYPE_OPEN,
                          0, inode);

      if (can_lock) {
            status = ocfs2_open_lock(inode);
            if (status) {
                  make_bad_inode(inode);
                  mlog_errno(status);
                  return status;
            }
            status = ocfs2_meta_lock(inode, NULL, 0);
            if (status) {
                  make_bad_inode(inode);
                  mlog_errno(status);
                  return status;
            }
      }

      if (args->fi_flags & OCFS2_FI_FLAG_ORPHAN_RECOVERY) {
            status = ocfs2_try_open_lock(inode, 0);
            if (status) {
                  make_bad_inode(inode);  
                  return status;
            }
      }

      status = ocfs2_read_block(osb, args->fi_blkno, &bh, 0,
                          can_lock ? inode : NULL);
      if (status < 0) {
            mlog_errno(status);
            goto bail;
      }

      status = -EINVAL;
      fe = (struct ocfs2_dinode *) bh->b_data;
      if (!OCFS2_IS_VALID_DINODE(fe)) {
            mlog(0, "Invalid dinode #%llu: signature = %.*s\n",
                 (unsigned long long)args->fi_blkno, 7,
                 fe->i_signature);
            goto bail;
      }

      /*
       * This is a code bug. Right now the caller needs to
       * understand whether it is asking for a system file inode or
       * not so the proper lock names can be built.
       */
      mlog_bug_on_msg(!!(fe->i_flags & cpu_to_le32(OCFS2_SYSTEM_FL)) !=
                  !!(args->fi_flags & OCFS2_FI_FLAG_SYSFILE),
                  "Inode %llu: system file state is ambigous\n",
                  (unsigned long long)args->fi_blkno);

      if (S_ISCHR(le16_to_cpu(fe->i_mode)) ||
          S_ISBLK(le16_to_cpu(fe->i_mode)))
            inode->i_rdev = huge_decode_dev(le64_to_cpu(fe->id1.dev1.i_rdev));

      if (ocfs2_populate_inode(inode, fe, 0) < 0)
            goto bail;

      BUG_ON(args->fi_blkno != le64_to_cpu(fe->i_blkno));

      status = 0;

bail:
      if (can_lock)
            ocfs2_meta_unlock(inode, 0);

      if (status < 0)
            make_bad_inode(inode);

      if (args && bh)
            brelse(bh);

      mlog_exit(status);
      return status;
}

void ocfs2_sync_blockdev(struct super_block *sb)
{
      sync_blockdev(sb->s_bdev);
}

static int ocfs2_truncate_for_delete(struct ocfs2_super *osb,
                             struct inode *inode,
                             struct buffer_head *fe_bh)
{
      int status = 0;
      struct ocfs2_truncate_context *tc = NULL;
      struct ocfs2_dinode *fe;
      handle_t *handle = NULL;

      mlog_entry_void();

      fe = (struct ocfs2_dinode *) fe_bh->b_data;

      /*
       * This check will also skip truncate of inodes with inline
       * data and fast symlinks.
       */
      if (fe->i_clusters) {
            handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
            if (IS_ERR(handle)) {
                  status = PTR_ERR(handle);
                  mlog_errno(status);
                  goto out;
            }

            status = ocfs2_journal_access(handle, inode, fe_bh,
                                    OCFS2_JOURNAL_ACCESS_WRITE);
            if (status < 0) {
                  mlog_errno(status);
                  goto out;
            }

            i_size_write(inode, 0);

            status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
            if (status < 0) {
                  mlog_errno(status);
                  goto out;
            }

            ocfs2_commit_trans(osb, handle);
            handle = NULL;

            status = ocfs2_prepare_truncate(osb, inode, fe_bh, &tc);
            if (status < 0) {
                  mlog_errno(status);
                  goto out;
            }

            status = ocfs2_commit_truncate(osb, inode, fe_bh, tc);
            if (status < 0) {
                  mlog_errno(status);
                  goto out;
            }
      }

out:
      if (handle)
            ocfs2_commit_trans(osb, handle);
      mlog_exit(status);
      return status;
}

static int ocfs2_remove_inode(struct inode *inode,
                        struct buffer_head *di_bh,
                        struct inode *orphan_dir_inode,
                        struct buffer_head *orphan_dir_bh)
{
      int status;
      struct inode *inode_alloc_inode = NULL;
      struct buffer_head *inode_alloc_bh = NULL;
      handle_t *handle;
      struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
      struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data;

      inode_alloc_inode =
            ocfs2_get_system_file_inode(osb, INODE_ALLOC_SYSTEM_INODE,
                                  le16_to_cpu(di->i_suballoc_slot));
      if (!inode_alloc_inode) {
            status = -EEXIST;
            mlog_errno(status);
            goto bail;
      }

      mutex_lock(&inode_alloc_inode->i_mutex);
      status = ocfs2_meta_lock(inode_alloc_inode, &inode_alloc_bh, 1);
      if (status < 0) {
            mutex_unlock(&inode_alloc_inode->i_mutex);

            mlog_errno(status);
            goto bail;
      }

      handle = ocfs2_start_trans(osb, OCFS2_DELETE_INODE_CREDITS);
      if (IS_ERR(handle)) {
            status = PTR_ERR(handle);
            mlog_errno(status);
            goto bail_unlock;
      }

      status = ocfs2_orphan_del(osb, handle, orphan_dir_inode, inode,
                          orphan_dir_bh);
      if (status < 0) {
            mlog_errno(status);
            goto bail_commit;
      }

      /* set the inodes dtime */
      status = ocfs2_journal_access(handle, inode, di_bh,
                              OCFS2_JOURNAL_ACCESS_WRITE);
      if (status < 0) {
            mlog_errno(status);
            goto bail_commit;
      }

      di->i_dtime = cpu_to_le64(CURRENT_TIME.tv_sec);
      le32_and_cpu(&di->i_flags, ~(OCFS2_VALID_FL | OCFS2_ORPHANED_FL));

      status = ocfs2_journal_dirty(handle, di_bh);
      if (status < 0) {
            mlog_errno(status);
            goto bail_commit;
      }

      ocfs2_remove_from_cache(inode, di_bh);

      status = ocfs2_free_dinode(handle, inode_alloc_inode,
                           inode_alloc_bh, di);
      if (status < 0)
            mlog_errno(status);

bail_commit:
      ocfs2_commit_trans(osb, handle);
bail_unlock:
      ocfs2_meta_unlock(inode_alloc_inode, 1);
      mutex_unlock(&inode_alloc_inode->i_mutex);
      brelse(inode_alloc_bh);
bail:
      iput(inode_alloc_inode);

      return status;
}

/* 
 * Serialize with orphan dir recovery. If the process doing
 * recovery on this orphan dir does an iget() with the dir
 * i_mutex held, we'll deadlock here. Instead we detect this
 * and exit early - recovery will wipe this inode for us.
 */
static int ocfs2_check_orphan_recovery_state(struct ocfs2_super *osb,
                                   int slot)
{
      int ret = 0;

      spin_lock(&osb->osb_lock);
      if (ocfs2_node_map_test_bit(osb, &osb->osb_recovering_orphan_dirs, slot)) {
            mlog(0, "Recovery is happening on orphan dir %d, will skip "
                 "this inode\n", slot);
            ret = -EDEADLK;
            goto out;
      }
      /* This signals to the orphan recovery process that it should
       * wait for us to handle the wipe. */
      osb->osb_orphan_wipes[slot]++;
out:
      spin_unlock(&osb->osb_lock);
      return ret;
}

static void ocfs2_signal_wipe_completion(struct ocfs2_super *osb,
                               int slot)
{
      spin_lock(&osb->osb_lock);
      osb->osb_orphan_wipes[slot]--;
      spin_unlock(&osb->osb_lock);

      wake_up(&osb->osb_wipe_event);
}

static int ocfs2_wipe_inode(struct inode *inode,
                      struct buffer_head *di_bh)
{
      int status, orphaned_slot;
      struct inode *orphan_dir_inode = NULL;
      struct buffer_head *orphan_dir_bh = NULL;
      struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
      struct ocfs2_dinode *di;

      di = (struct ocfs2_dinode *) di_bh->b_data;
      orphaned_slot = le16_to_cpu(di->i_orphaned_slot);

      status = ocfs2_check_orphan_recovery_state(osb, orphaned_slot);
      if (status)
            return status;

      orphan_dir_inode = ocfs2_get_system_file_inode(osb,
                                           ORPHAN_DIR_SYSTEM_INODE,
                                           orphaned_slot);
      if (!orphan_dir_inode) {
            status = -EEXIST;
            mlog_errno(status);
            goto bail;
      }

      /* Lock the orphan dir. The lock will be held for the entire
       * delete_inode operation. We do this now to avoid races with
       * recovery completion on other nodes. */
      mutex_lock(&orphan_dir_inode->i_mutex);
      status = ocfs2_meta_lock(orphan_dir_inode, &orphan_dir_bh, 1);
      if (status < 0) {
            mutex_unlock(&orphan_dir_inode->i_mutex);

            mlog_errno(status);
            goto bail;
      }

      /* we do this while holding the orphan dir lock because we
       * don't want recovery being run from another node to vote for
       * an inode delete on us -- this will result in two nodes
       * truncating the same file! */
      status = ocfs2_truncate_for_delete(osb, inode, di_bh);
      if (status < 0) {
            mlog_errno(status);
            goto bail_unlock_dir;
      }

      status = ocfs2_remove_inode(inode, di_bh, orphan_dir_inode,
                            orphan_dir_bh);
      if (status < 0)
            mlog_errno(status);

bail_unlock_dir:
      ocfs2_meta_unlock(orphan_dir_inode, 1);
      mutex_unlock(&orphan_dir_inode->i_mutex);
      brelse(orphan_dir_bh);
bail:
      iput(orphan_dir_inode);
      ocfs2_signal_wipe_completion(osb, orphaned_slot);

      return status;
}

/* There is a series of simple checks that should be done before a
 * vote is even considered. Encapsulate those in this function. */
static int ocfs2_inode_is_valid_to_delete(struct inode *inode)
{
      int ret = 0;
      struct ocfs2_inode_info *oi = OCFS2_I(inode);
      struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);

      /* We shouldn't be getting here for the root directory
       * inode.. */
      if (inode == osb->root_inode) {
            mlog(ML_ERROR, "Skipping delete of root inode.\n");
            goto bail;
      }

      /* If we're coming from process_vote we can't go into our own
       * voting [hello, deadlock city!], so unforuntately we just
       * have to skip deleting this guy. That's OK though because
       * the node who's doing the actual deleting should handle it
       * anyway. */
      if (current == osb->vote_task) {
            mlog(0, "Skipping delete of %lu because we're currently "
                 "in process_vote\n", inode->i_ino);
            goto bail;
      }

      spin_lock(&oi->ip_lock);
      /* OCFS2 *never* deletes system files. This should technically
       * never get here as system file inodes should always have a
       * positive link count. */
      if (oi->ip_flags & OCFS2_INODE_SYSTEM_FILE) {
            mlog(ML_ERROR, "Skipping delete of system file %llu\n",
                 (unsigned long long)oi->ip_blkno);
            goto bail_unlock;
      }

      /* If we have voted "yes" on the wipe of this inode for
       * another node, it will be marked here so we can safely skip
       * it. Recovery will cleanup any inodes we might inadvertantly
       * skip here. */
      if (oi->ip_flags & OCFS2_INODE_SKIP_DELETE) {
            mlog(0, "Skipping delete of %lu because another node "
                 "has done this for us.\n", inode->i_ino);
            goto bail_unlock;
      }

      ret = 1;
bail_unlock:
      spin_unlock(&oi->ip_lock);
bail:
      return ret;
}

/* Query the cluster to determine whether we should wipe an inode from
 * disk or not.
 *
 * Requires the inode to have the cluster lock. */
static int ocfs2_query_inode_wipe(struct inode *inode,
                          struct buffer_head *di_bh,
                          int *wipe)
{
      int status = 0;
      struct ocfs2_inode_info *oi = OCFS2_I(inode);
      struct ocfs2_dinode *di;

      *wipe = 0;

      /* While we were waiting for the cluster lock in
       * ocfs2_delete_inode, another node might have asked to delete
       * the inode. Recheck our flags to catch this. */
      if (!ocfs2_inode_is_valid_to_delete(inode)) {
            mlog(0, "Skipping delete of %llu because flags changed\n",
                 (unsigned long long)oi->ip_blkno);
            goto bail;
      }

      /* Now that we have an up to date inode, we can double check
       * the link count. */
      if (inode->i_nlink) {
            mlog(0, "Skipping delete of %llu because nlink = %u\n",
                 (unsigned long long)oi->ip_blkno, inode->i_nlink);
            goto bail;
      }

      /* Do some basic inode verification... */
      di = (struct ocfs2_dinode *) di_bh->b_data;
      if (!(di->i_flags & cpu_to_le32(OCFS2_ORPHANED_FL))) {
            /* for lack of a better error? */
            status = -EEXIST;
            mlog(ML_ERROR,
                 "Inode %llu (on-disk %llu) not orphaned! "
                 "Disk flags  0x%x, inode flags 0x%x\n",
                 (unsigned long long)oi->ip_blkno,
                 (unsigned long long)le64_to_cpu(di->i_blkno),
                 le32_to_cpu(di->i_flags), oi->ip_flags);
            goto bail;
      }

      /* has someone already deleted us?! baaad... */
      if (di->i_dtime) {
            status = -EEXIST;
            mlog_errno(status);
            goto bail;
      }

      /*
       * This is how ocfs2 determines whether an inode is still live
       * within the cluster. Every node takes a shared read lock on
       * the inode open lock in ocfs2_read_locked_inode(). When we
       * get to ->delete_inode(), each node tries to convert it's
       * lock to an exclusive. Trylocks are serialized by the inode
       * meta data lock. If the upconvert suceeds, we know the inode
       * is no longer live and can be deleted.
       *
       * Though we call this with the meta data lock held, the
       * trylock keeps us from ABBA deadlock.
       */
      status = ocfs2_try_open_lock(inode, 1);
      if (status == -EAGAIN) {
            status = 0;
            mlog(0, "Skipping delete of %llu because it is in use on "
                 "other nodes\n", (unsigned long long)oi->ip_blkno);
            goto bail;
      }
      if (status < 0) {
            mlog_errno(status);
            goto bail;
      }

      *wipe = 1;
      mlog(0, "Inode %llu is ok to wipe from orphan dir %u\n",
           (unsigned long long)oi->ip_blkno,
           le16_to_cpu(di->i_orphaned_slot));

bail:
      return status;
}

/* Support function for ocfs2_delete_inode. Will help us keep the
 * inode data in a consistent state for clear_inode. Always truncates
 * pages, optionally sync's them first. */
static void ocfs2_cleanup_delete_inode(struct inode *inode,
                               int sync_data)
{
      mlog(0, "Cleanup inode %llu, sync = %d\n",
           (unsigned long long)OCFS2_I(inode)->ip_blkno, sync_data);
      if (sync_data)
            write_inode_now(inode, 1);
      truncate_inode_pages(&inode->i_data, 0);
}

void ocfs2_delete_inode(struct inode *inode)
{
      int wipe, status;
      sigset_t blocked, oldset;
      struct buffer_head *di_bh = NULL;

      mlog_entry("(inode->i_ino = %lu)\n", inode->i_ino);

      if (is_bad_inode(inode)) {
            mlog(0, "Skipping delete of bad inode\n");
            goto bail;
      }

      if (!ocfs2_inode_is_valid_to_delete(inode)) {
            /* It's probably not necessary to truncate_inode_pages
             * here but we do it for safety anyway (it will most
             * likely be a no-op anyway) */
            ocfs2_cleanup_delete_inode(inode, 0);
            goto bail;
      }

      /* We want to block signals in delete_inode as the lock and
       * messaging paths may return us -ERESTARTSYS. Which would
       * cause us to exit early, resulting in inodes being orphaned
       * forever. */
      sigfillset(&blocked);
      status = sigprocmask(SIG_BLOCK, &blocked, &oldset);
      if (status < 0) {
            mlog_errno(status);
            ocfs2_cleanup_delete_inode(inode, 1);
            goto bail;
      }

      /* Lock down the inode. This gives us an up to date view of
       * it's metadata (for verification), and allows us to
       * serialize delete_inode votes. 
       *
       * Even though we might be doing a truncate, we don't take the
       * allocation lock here as it won't be needed - nobody will
       * have the file open.
       */
      status = ocfs2_meta_lock(inode, &di_bh, 1);
      if (status < 0) {
            if (status != -ENOENT)
                  mlog_errno(status);
            ocfs2_cleanup_delete_inode(inode, 0);
            goto bail_unblock;
      }

      /* Query the cluster. This will be the final decision made
       * before we go ahead and wipe the inode. */
      status = ocfs2_query_inode_wipe(inode, di_bh, &wipe);
      if (!wipe || status < 0) {
            /* Error and inode busy vote both mean we won't be
             * removing the inode, so they take almost the same
             * path. */
            if (status < 0)
                  mlog_errno(status);

            /* Someone in the cluster has voted to not wipe this
             * inode, or it was never completely orphaned. Write
             * out the pages and exit now. */
            ocfs2_cleanup_delete_inode(inode, 1);
            goto bail_unlock_inode;
      }

      ocfs2_cleanup_delete_inode(inode, 0);

      status = ocfs2_wipe_inode(inode, di_bh);
      if (status < 0) {
            if (status != -EDEADLK)
                  mlog_errno(status);
            goto bail_unlock_inode;
      }

      /*
       * Mark the inode as successfully deleted.
       *
       * This is important for ocfs2_clear_inode() as it will check
       * this flag and skip any checkpointing work
       *
       * ocfs2_stuff_meta_lvb() also uses this flag to invalidate
       * the LVB for other nodes.
       */
      OCFS2_I(inode)->ip_flags |= OCFS2_INODE_DELETED;

bail_unlock_inode:
      ocfs2_meta_unlock(inode, 1);
      brelse(di_bh);
bail_unblock:
      status = sigprocmask(SIG_SETMASK, &oldset, NULL);
      if (status < 0)
            mlog_errno(status);
bail:
      clear_inode(inode);
      mlog_exit_void();
}

void ocfs2_clear_inode(struct inode *inode)
{
      int status;
      struct ocfs2_inode_info *oi = OCFS2_I(inode);

      mlog_entry_void();

      if (!inode)
            goto bail;

      mlog(0, "Clearing inode: %llu, nlink = %u\n",
           (unsigned long long)OCFS2_I(inode)->ip_blkno, inode->i_nlink);

      mlog_bug_on_msg(OCFS2_SB(inode->i_sb) == NULL,
                  "Inode=%lu\n", inode->i_ino);

      /* For remove delete_inode vote, we hold open lock before,
       * now it is time to unlock PR and EX open locks. */
      ocfs2_open_unlock(inode);

      /* Do these before all the other work so that we don't bounce
       * the vote thread while waiting to destroy the locks. */
      ocfs2_mark_lockres_freeing(&oi->ip_rw_lockres);
      ocfs2_mark_lockres_freeing(&oi->ip_meta_lockres);
      ocfs2_mark_lockres_freeing(&oi->ip_data_lockres);
      ocfs2_mark_lockres_freeing(&oi->ip_open_lockres);

      /* We very well may get a clear_inode before all an inodes
       * metadata has hit disk. Of course, we can't drop any cluster
       * locks until the journal has finished with it. The only
       * exception here are successfully wiped inodes - their
       * metadata can now be considered to be part of the system
       * inodes from which it came. */
      if (!(OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED))
            ocfs2_checkpoint_inode(inode);

      mlog_bug_on_msg(!list_empty(&oi->ip_io_markers),
                  "Clear inode of %llu, inode has io markers\n",
                  (unsigned long long)oi->ip_blkno);

      ocfs2_extent_map_trunc(inode, 0);

      status = ocfs2_drop_inode_locks(inode);
      if (status < 0)
            mlog_errno(status);

      ocfs2_lock_res_free(&oi->ip_rw_lockres);
      ocfs2_lock_res_free(&oi->ip_meta_lockres);
      ocfs2_lock_res_free(&oi->ip_data_lockres);
      ocfs2_lock_res_free(&oi->ip_open_lockres);

      ocfs2_metadata_cache_purge(inode);

      mlog_bug_on_msg(oi->ip_metadata_cache.ci_num_cached,
                  "Clear inode of %llu, inode has %u cache items\n",
                  (unsigned long long)oi->ip_blkno, oi->ip_metadata_cache.ci_num_cached);

      mlog_bug_on_msg(!(oi->ip_flags & OCFS2_INODE_CACHE_INLINE),
                  "Clear inode of %llu, inode has a bad flag\n",
                  (unsigned long long)oi->ip_blkno);

      mlog_bug_on_msg(spin_is_locked(&oi->ip_lock),
                  "Clear inode of %llu, inode is locked\n",
                  (unsigned long long)oi->ip_blkno);

      mlog_bug_on_msg(!mutex_trylock(&oi->ip_io_mutex),
                  "Clear inode of %llu, io_mutex is locked\n",
                  (unsigned long long)oi->ip_blkno);
      mutex_unlock(&oi->ip_io_mutex);

      /*
       * down_trylock() returns 0, down_write_trylock() returns 1
       * kernel 1, world 0
       */
      mlog_bug_on_msg(!down_write_trylock(&oi->ip_alloc_sem),
                  "Clear inode of %llu, alloc_sem is locked\n",
                  (unsigned long long)oi->ip_blkno);
      up_write(&oi->ip_alloc_sem);

      mlog_bug_on_msg(oi->ip_open_count,
                  "Clear inode of %llu has open count %d\n",
                  (unsigned long long)oi->ip_blkno, oi->ip_open_count);

      /* Clear all other flags. */
      oi->ip_flags = OCFS2_INODE_CACHE_INLINE;
      oi->ip_created_trans = 0;
      oi->ip_last_trans = 0;
      oi->ip_dir_start_lookup = 0;
      oi->ip_blkno = 0ULL;

bail:
      mlog_exit_void();
}

/* Called under inode_lock, with no more references on the
 * struct inode, so it's safe here to check the flags field
 * and to manipulate i_nlink without any other locks. */
void ocfs2_drop_inode(struct inode *inode)
{
      struct ocfs2_inode_info *oi = OCFS2_I(inode);

      mlog_entry_void();

      mlog(0, "Drop inode %llu, nlink = %u, ip_flags = 0x%x\n",
           (unsigned long long)oi->ip_blkno, inode->i_nlink, oi->ip_flags);

      if (oi->ip_flags & OCFS2_INODE_MAYBE_ORPHANED)
            generic_delete_inode(inode);
      else
            generic_drop_inode(inode);

      mlog_exit_void();
}

/*
 * TODO: this should probably be merged into ocfs2_get_block
 *
 * However, you now need to pay attention to the cont_prepare_write()
 * stuff in ocfs2_get_block (that is, ocfs2_get_block pretty much
 * expects never to extend).
 */
struct buffer_head *ocfs2_bread(struct inode *inode,
                        int block, int *err, int reada)
{
      struct buffer_head *bh = NULL;
      int tmperr;
      u64 p_blkno;
      int readflags = OCFS2_BH_CACHED;

      if (reada)
            readflags |= OCFS2_BH_READAHEAD;

      if (((u64)block << inode->i_sb->s_blocksize_bits) >=
          i_size_read(inode)) {
            BUG_ON(!reada);
            return NULL;
      }

      down_read(&OCFS2_I(inode)->ip_alloc_sem);
      tmperr = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL,
                                   NULL);
      up_read(&OCFS2_I(inode)->ip_alloc_sem);
      if (tmperr < 0) {
            mlog_errno(tmperr);
            goto fail;
      }

      tmperr = ocfs2_read_block(OCFS2_SB(inode->i_sb), p_blkno, &bh,
                          readflags, inode);
      if (tmperr < 0)
            goto fail;

      tmperr = 0;

      *err = 0;
      return bh;

fail:
      if (bh) {
            brelse(bh);
            bh = NULL;
      }
      *err = -EIO;
      return NULL;
}

/*
 * This is called from our getattr.
 */
int ocfs2_inode_revalidate(struct dentry *dentry)
{
      struct inode *inode = dentry->d_inode;
      int status = 0;

      mlog_entry("(inode = 0x%p, ino = %llu)\n", inode,
               inode ? (unsigned long long)OCFS2_I(inode)->ip_blkno : 0ULL);

      if (!inode) {
            mlog(0, "eep, no inode!\n");
            status = -ENOENT;
            goto bail;
      }

      spin_lock(&OCFS2_I(inode)->ip_lock);
      if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) {
            spin_unlock(&OCFS2_I(inode)->ip_lock);
            mlog(0, "inode deleted!\n");
            status = -ENOENT;
            goto bail;
      }
      spin_unlock(&OCFS2_I(inode)->ip_lock);

      /* Let ocfs2_meta_lock do the work of updating our struct
       * inode for us. */
      status = ocfs2_meta_lock(inode, NULL, 0);
      if (status < 0) {
            if (status != -ENOENT)
                  mlog_errno(status);
            goto bail;
      }
      ocfs2_meta_unlock(inode, 0);
bail:
      mlog_exit(status);

      return status;
}

/*
 * Updates a disk inode from a
 * struct inode.
 * Only takes ip_lock.
 */
int ocfs2_mark_inode_dirty(handle_t *handle,
                     struct inode *inode,
                     struct buffer_head *bh)
{
      int status;
      struct ocfs2_dinode *fe = (struct ocfs2_dinode *) bh->b_data;

      mlog_entry("(inode %llu)\n",
               (unsigned long long)OCFS2_I(inode)->ip_blkno);

      status = ocfs2_journal_access(handle, inode, bh,
                              OCFS2_JOURNAL_ACCESS_WRITE);
      if (status < 0) {
            mlog_errno(status);
            goto leave;
      }

      spin_lock(&OCFS2_I(inode)->ip_lock);
      fe->i_clusters = cpu_to_le32(OCFS2_I(inode)->ip_clusters);
      ocfs2_get_inode_flags(OCFS2_I(inode));
      fe->i_attr = cpu_to_le32(OCFS2_I(inode)->ip_attr);
      fe->i_dyn_features = cpu_to_le16(OCFS2_I(inode)->ip_dyn_features);
      spin_unlock(&OCFS2_I(inode)->ip_lock);

      fe->i_size = cpu_to_le64(i_size_read(inode));
      fe->i_links_count = cpu_to_le16(inode->i_nlink);
      fe->i_uid = cpu_to_le32(inode->i_uid);
      fe->i_gid = cpu_to_le32(inode->i_gid);
      fe->i_mode = cpu_to_le16(inode->i_mode);
      fe->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
      fe->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
      fe->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
      fe->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
      fe->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
      fe->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);

      status = ocfs2_journal_dirty(handle, bh);
      if (status < 0)
            mlog_errno(status);

      status = 0;
leave:

      mlog_exit(status);
      return status;
}

/*
 *
 * Updates a struct inode from a disk inode.
 * does no i/o, only takes ip_lock.
 */
void ocfs2_refresh_inode(struct inode *inode,
                   struct ocfs2_dinode *fe)
{
      spin_lock(&OCFS2_I(inode)->ip_lock);

      OCFS2_I(inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
      OCFS2_I(inode)->ip_attr = le32_to_cpu(fe->i_attr);
      OCFS2_I(inode)->ip_dyn_features = le16_to_cpu(fe->i_dyn_features);
      ocfs2_set_inode_flags(inode);
      i_size_write(inode, le64_to_cpu(fe->i_size));
      inode->i_nlink = le16_to_cpu(fe->i_links_count);
      inode->i_uid = le32_to_cpu(fe->i_uid);
      inode->i_gid = le32_to_cpu(fe->i_gid);
      inode->i_mode = le16_to_cpu(fe->i_mode);
      if (S_ISLNK(inode->i_mode) && le32_to_cpu(fe->i_clusters) == 0)
            inode->i_blocks = 0;
      else
            inode->i_blocks = ocfs2_inode_sector_count(inode);
      inode->i_atime.tv_sec = le64_to_cpu(fe->i_atime);
      inode->i_atime.tv_nsec = le32_to_cpu(fe->i_atime_nsec);
      inode->i_mtime.tv_sec = le64_to_cpu(fe->i_mtime);
      inode->i_mtime.tv_nsec = le32_to_cpu(fe->i_mtime_nsec);
      inode->i_ctime.tv_sec = le64_to_cpu(fe->i_ctime);
      inode->i_ctime.tv_nsec = le32_to_cpu(fe->i_ctime_nsec);

      spin_unlock(&OCFS2_I(inode)->ip_lock);
}

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