[PATCH] OCFS2: The Second Oracle Cluster Filesystem

The OCFS2 file system module.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
Signed-off-by: Kurt Hackel <kurt.hackel@oracle.com>

1 files changed, 1237 insertions, 0 deletions

diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
new file mode 100644
index 000000000000..72ae9e3306f4
--- /dev/null
+++ b/fs/ocfs2/file.c
@@ -0,0 +1,1237 @@
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * file.c
+ *
+ * File open, close, extend, truncate
+ *
+ * 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 <linux/uio.h>
+
+#define MLOG_MASK_PREFIX ML_INODE
+#include <cluster/masklog.h>
+
+#include "ocfs2.h"
+
+#include "alloc.h"
+#include "aops.h"
+#include "dir.h"
+#include "dlmglue.h"
+#include "extent_map.h"
+#include "file.h"
+#include "sysfile.h"
+#include "inode.h"
+#include "journal.h"
+#include "mmap.h"
+#include "suballoc.h"
+#include "super.h"
+
+#include "buffer_head_io.h"
+
+static int ocfs2_sync_inode(struct inode *inode)
+{
+        filemap_fdatawrite(inode->i_mapping);
+        return sync_mapping_buffers(inode->i_mapping);
+}
+
+static int ocfs2_file_open(struct inode *inode, struct file *file)
+{
+        int status;
+        int mode = file->f_flags;
+        struct ocfs2_inode_info *oi = OCFS2_I(inode);
+
+        mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file,
+                   file->f_dentry->d_name.len, file->f_dentry->d_name.name);
+
+        spin_lock(&oi->ip_lock);
+
+        /* Check that the inode hasn't been wiped from disk by another
+         * node. If it hasn't then we're safe as long as we hold the
+         * spin lock until our increment of open count. */
+        if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) {
+                spin_unlock(&oi->ip_lock);
+
+                status = -ENOENT;
+                goto leave;
+        }
+
+        if (mode & O_DIRECT)
+                oi->ip_flags |= OCFS2_INODE_OPEN_DIRECT;
+
+        oi->ip_open_count++;
+        spin_unlock(&oi->ip_lock);
+        status = 0;
+leave:
+        mlog_exit(status);
+        return status;
+}
+
+static int ocfs2_file_release(struct inode *inode, struct file *file)
+{
+        struct ocfs2_inode_info *oi = OCFS2_I(inode);
+
+        mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file,
+                       file->f_dentry->d_name.len,
+                       file->f_dentry->d_name.name);
+
+        spin_lock(&oi->ip_lock);
+        if (!--oi->ip_open_count)
+                oi->ip_flags &= ~OCFS2_INODE_OPEN_DIRECT;
+        spin_unlock(&oi->ip_lock);
+
+        mlog_exit(0);
+
+        return 0;
+}
+
+static int ocfs2_sync_file(struct file *file,
+                           struct dentry *dentry,
+                           int datasync)
+{
+        int err = 0;
+        journal_t *journal;
+        struct inode *inode = dentry->d_inode;
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+
+        mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", file, dentry, datasync,
+                   dentry->d_name.len, dentry->d_name.name);
+
+        err = ocfs2_sync_inode(dentry->d_inode);
+        if (err)
+                goto bail;
+
+        journal = osb->journal->j_journal;
+        err = journal_force_commit(journal);
+
+bail:
+        mlog_exit(err);
+
+        return (err < 0) ? -EIO : 0;
+}
+
+int ocfs2_set_inode_size(struct ocfs2_journal_handle *handle,
+                         struct inode *inode,
+                         struct buffer_head *fe_bh,
+                         u64 new_i_size)
+{
+        int status;
+
+        mlog_entry_void();
+        i_size_write(inode, new_i_size);
+        inode->i_blocks = ocfs2_align_bytes_to_sectors(new_i_size);
+        inode->i_ctime = inode->i_mtime = CURRENT_TIME;
+
+        status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
+        if (status < 0) {
+                mlog_errno(status);
+                goto bail;
+        }
+
+bail:
+        mlog_exit(status);
+        return status;
+}
+
+static int ocfs2_simple_size_update(struct inode *inode,
+                                    struct buffer_head *di_bh,
+                                    u64 new_i_size)
+{
+        int ret;
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        struct ocfs2_journal_handle *handle = NULL;
+
+        handle = ocfs2_start_trans(osb, NULL,
+                                   OCFS2_INODE_UPDATE_CREDITS);
+        if (handle == NULL) {
+                ret = -ENOMEM;
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = ocfs2_set_inode_size(handle, inode, di_bh,
+                                   new_i_size);
+        if (ret < 0)
+                mlog_errno(ret);
+
+        ocfs2_commit_trans(handle);
+out:
+        return ret;
+}
+
+static int ocfs2_orphan_for_truncate(struct ocfs2_super *osb,
+                                     struct inode *inode,
+                                     struct buffer_head *fe_bh,
+                                     u64 new_i_size)
+{
+        int status;
+        struct ocfs2_journal_handle *handle;
+
+        mlog_entry_void();
+
+        /* TODO: This needs to actually orphan the inode in this
+         * transaction. */
+
+        handle = ocfs2_start_trans(osb, NULL, OCFS2_INODE_UPDATE_CREDITS);
+        if (IS_ERR(handle)) {
+                status = PTR_ERR(handle);
+                mlog_errno(status);
+                goto out;
+        }
+
+        status = ocfs2_set_inode_size(handle, inode, fe_bh, new_i_size);
+        if (status < 0)
+                mlog_errno(status);
+
+        ocfs2_commit_trans(handle);
+out:
+        mlog_exit(status);
+        return status;
+}
+
+static int ocfs2_truncate_file(struct inode *inode,
+                               struct buffer_head *di_bh,
+                               u64 new_i_size)
+{
+        int status = 0;
+        struct ocfs2_dinode *fe = NULL;
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        struct ocfs2_truncate_context *tc = NULL;
+
+        mlog_entry("(inode = %"MLFu64", new_i_size = %"MLFu64"\n",
+                   OCFS2_I(inode)->ip_blkno, new_i_size);
+
+        truncate_inode_pages(inode->i_mapping, new_i_size);
+
+        fe = (struct ocfs2_dinode *) di_bh->b_data;
+        if (!OCFS2_IS_VALID_DINODE(fe)) {
+                OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe);
+                status = -EIO;
+                goto bail;
+        }
+
+        mlog_bug_on_msg(le64_to_cpu(fe->i_size) != i_size_read(inode),
+                        "Inode %"MLFu64", inode i_size = %lld != di "
+                        "i_size = %"MLFu64", i_flags = 0x%x\n",
+                        OCFS2_I(inode)->ip_blkno,
+                        i_size_read(inode),
+                        le64_to_cpu(fe->i_size), le32_to_cpu(fe->i_flags));
+
+        if (new_i_size > le64_to_cpu(fe->i_size)) {
+                mlog(0, "asked to truncate file with size (%"MLFu64") "
+                     "to size (%"MLFu64")!\n",
+                     le64_to_cpu(fe->i_size), new_i_size);
+                status = -EINVAL;
+                mlog_errno(status);
+                goto bail;
+        }
+
+        mlog(0, "inode %"MLFu64", i_size = %"MLFu64", new_i_size = %"MLFu64"\n",
+             le64_to_cpu(fe->i_blkno), le64_to_cpu(fe->i_size), new_i_size);
+
+        /* lets handle the simple truncate cases before doing any more
+         * cluster locking. */
+        if (new_i_size == le64_to_cpu(fe->i_size))
+                goto bail;
+
+        if (le32_to_cpu(fe->i_clusters) ==
+            ocfs2_clusters_for_bytes(osb->sb, new_i_size)) {
+                mlog(0, "fe->i_clusters = %u, so we do a simple truncate\n",
+                     fe->i_clusters);
+                /* No allocation change is required, so lets fast path
+                 * this truncate. */
+                status = ocfs2_simple_size_update(inode, di_bh, new_i_size);
+                if (status < 0)
+                        mlog_errno(status);
+                goto bail;
+        }
+
+        /* This forces other nodes to sync and drop their pages */
+        status = ocfs2_data_lock(inode, 1);
+        if (status < 0) {
+                mlog_errno(status);
+                goto bail;
+        }
+        ocfs2_data_unlock(inode, 1);
+
+        /* alright, we're going to need to do a full blown alloc size
+         * change. Orphan the inode so that recovery can complete the
+         * truncate if necessary. This does the task of marking
+         * i_size. */
+        status = ocfs2_orphan_for_truncate(osb, inode, di_bh, new_i_size);
+        if (status < 0) {
+                mlog_errno(status);
+                goto bail;
+        }
+
+        status = ocfs2_prepare_truncate(osb, inode, di_bh, &tc);
+        if (status < 0) {
+                mlog_errno(status);
+                goto bail;
+        }
+
+        status = ocfs2_commit_truncate(osb, inode, di_bh, tc);
+        if (status < 0) {
+                mlog_errno(status);
+                goto bail;
+        }
+
+        /* TODO: orphan dir cleanup here. */
+bail:
+
+        mlog_exit(status);
+        return status;
+}
+
+/*
+ * extend allocation only here.
+ * we'll update all the disk stuff, and oip->alloc_size
+ *
+ * expect stuff to be locked, a transaction started and enough data /
+ * metadata reservations in the contexts.
+ *
+ * Will return -EAGAIN, and a reason if a restart is needed.
+ * If passed in, *reason will always be set, even in error.
+ */
+int ocfs2_do_extend_allocation(struct ocfs2_super *osb,
+                               struct inode *inode,
+                               u32 clusters_to_add,
+                               struct buffer_head *fe_bh,
+                               struct ocfs2_journal_handle *handle,
+                               struct ocfs2_alloc_context *data_ac,
+                               struct ocfs2_alloc_context *meta_ac,
+                               enum ocfs2_alloc_restarted *reason_ret)
+{
+        int status = 0;
+        int free_extents;
+        struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data;
+        enum ocfs2_alloc_restarted reason = RESTART_NONE;
+        u32 bit_off, num_bits;
+        u64 block;
+
+        BUG_ON(!clusters_to_add);
+
+        free_extents = ocfs2_num_free_extents(osb, inode, fe);
+        if (free_extents < 0) {
+                status = free_extents;
+                mlog_errno(status);
+                goto leave;
+        }
+
+        /* there are two cases which could cause us to EAGAIN in the
+         * we-need-more-metadata case:
+         * 1) we haven't reserved *any*
+         * 2) we are so fragmented, we've needed to add metadata too
+         *    many times. */
+        if (!free_extents && !meta_ac) {
+                mlog(0, "we haven't reserved any metadata!\n");
+                status = -EAGAIN;
+                reason = RESTART_META;
+                goto leave;
+        } else if ((!free_extents)
+                   && (ocfs2_alloc_context_bits_left(meta_ac)
+                       < ocfs2_extend_meta_needed(fe))) {
+                mlog(0, "filesystem is really fragmented...\n");
+                status = -EAGAIN;
+                reason = RESTART_META;
+                goto leave;
+        }
+
+        status = ocfs2_claim_clusters(osb, handle, data_ac, 1,
+                                      &bit_off, &num_bits);
+        if (status < 0) {
+                if (status != -ENOSPC)
+                        mlog_errno(status);
+                goto leave;
+        }
+
+        BUG_ON(num_bits > clusters_to_add);
+
+        /* reserve our write early -- insert_extent may update the inode */
+        status = ocfs2_journal_access(handle, inode, fe_bh,
+                                      OCFS2_JOURNAL_ACCESS_WRITE);
+        if (status < 0) {
+                mlog_errno(status);
+                goto leave;
+        }
+
+        block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
+        mlog(0, "Allocating %u clusters at block %u for inode %"MLFu64"\n",
+             num_bits, bit_off, OCFS2_I(inode)->ip_blkno);
+        status = ocfs2_insert_extent(osb, handle, inode, fe_bh, block,
+                                     num_bits, meta_ac);
+        if (status < 0) {
+                mlog_errno(status);
+                goto leave;
+        }
+
+        le32_add_cpu(&fe->i_clusters, num_bits);
+        spin_lock(&OCFS2_I(inode)->ip_lock);
+        OCFS2_I(inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
+        spin_unlock(&OCFS2_I(inode)->ip_lock);
+
+        status = ocfs2_journal_dirty(handle, fe_bh);
+        if (status < 0) {
+                mlog_errno(status);
+                goto leave;
+        }
+
+        clusters_to_add -= num_bits;
+
+        if (clusters_to_add) {
+                mlog(0, "need to alloc once more, clusters = %u, wanted = "
+                     "%u\n", fe->i_clusters, clusters_to_add);
+                status = -EAGAIN;
+                reason = RESTART_TRANS;
+        }
+
+leave:
+        mlog_exit(status);
+        if (reason_ret)
+                *reason_ret = reason;
+        return status;
+}
+
+static int ocfs2_extend_allocation(struct inode *inode,
+                                   u32 clusters_to_add)
+{
+        int status = 0;
+        int restart_func = 0;
+        int drop_alloc_sem = 0;
+        int credits, num_free_extents;
+        u32 prev_clusters;
+        struct buffer_head *bh = NULL;
+        struct ocfs2_dinode *fe = NULL;
+        struct ocfs2_journal_handle *handle = NULL;
+        struct ocfs2_alloc_context *data_ac = NULL;
+        struct ocfs2_alloc_context *meta_ac = NULL;
+        enum ocfs2_alloc_restarted why;
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+
+        mlog_entry("(clusters_to_add = %u)\n", clusters_to_add);
+
+        status = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno, &bh,
+                                  OCFS2_BH_CACHED, inode);
+        if (status < 0) {
+                mlog_errno(status);
+                goto leave;
+        }
+
+        fe = (struct ocfs2_dinode *) bh->b_data;
+        if (!OCFS2_IS_VALID_DINODE(fe)) {
+                OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe);
+                status = -EIO;
+                goto leave;
+        }
+
+restart_all:
+        BUG_ON(le32_to_cpu(fe->i_clusters) != OCFS2_I(inode)->ip_clusters);
+
+        mlog(0, "extend inode %"MLFu64", i_size = %lld, fe->i_clusters = %u, "
+             "clusters_to_add = %u\n",
+             OCFS2_I(inode)->ip_blkno, i_size_read(inode),
+             fe->i_clusters, clusters_to_add);
+
+        handle = ocfs2_alloc_handle(osb);
+        if (handle == NULL) {
+                status = -ENOMEM;
+                mlog_errno(status);
+                goto leave;
+        }
+
+        num_free_extents = ocfs2_num_free_extents(osb,
+                                                  inode,
+                                                  fe);
+        if (num_free_extents < 0) {
+                status = num_free_extents;
+                mlog_errno(status);
+                goto leave;
+        }
+
+        if (!num_free_extents) {
+                status = ocfs2_reserve_new_metadata(osb,
+                                                    handle,
+                                                    fe,
+                                                    &meta_ac);
+                if (status < 0) {
+                        if (status != -ENOSPC)
+                                mlog_errno(status);
+                        goto leave;
+                }
+        }
+
+        status = ocfs2_reserve_clusters(osb,
+                                        handle,
+                                        clusters_to_add,
+                                        &data_ac);
+        if (status < 0) {
+                if (status != -ENOSPC)
+                        mlog_errno(status);
+                goto leave;
+        }
+
+        /* blocks peope in read/write from reading our allocation
+         * until we're done changing it. We depend on i_sem to block
+         * other extend/truncate calls while we're here. Ordering wrt
+         * start_trans is important here -- always do it before! */
+        down_write(&OCFS2_I(inode)->ip_alloc_sem);
+        drop_alloc_sem = 1;
+
+        credits = ocfs2_calc_extend_credits(osb->sb, fe, clusters_to_add);
+        handle = ocfs2_start_trans(osb, handle, credits);
+        if (IS_ERR(handle)) {
+                status = PTR_ERR(handle);
+                handle = NULL;
+                mlog_errno(status);
+                goto leave;
+        }
+
+restarted_transaction:
+        /* reserve a write to the file entry early on - that we if we
+         * run out of credits in the allocation path, we can still
+         * update i_size. */
+        status = ocfs2_journal_access(handle, inode, bh,
+                                      OCFS2_JOURNAL_ACCESS_WRITE);
+        if (status < 0) {
+                mlog_errno(status);
+                goto leave;
+        }
+
+        prev_clusters = OCFS2_I(inode)->ip_clusters;
+
+        status = ocfs2_do_extend_allocation(osb,
+                                            inode,
+                                            clusters_to_add,
+                                            bh,
+                                            handle,
+                                            data_ac,
+                                            meta_ac,
+                                            &why);
+        if ((status < 0) && (status != -EAGAIN)) {
+                if (status != -ENOSPC)
+                        mlog_errno(status);
+                goto leave;
+        }
+
+        status = ocfs2_journal_dirty(handle, bh);
+        if (status < 0) {
+                mlog_errno(status);
+                goto leave;
+        }
+
+        spin_lock(&OCFS2_I(inode)->ip_lock);
+        clusters_to_add -= (OCFS2_I(inode)->ip_clusters - prev_clusters);
+        spin_unlock(&OCFS2_I(inode)->ip_lock);
+
+        if (why != RESTART_NONE && clusters_to_add) {
+                if (why == RESTART_META) {
+                        mlog(0, "restarting function.\n");
+                        restart_func = 1;
+                } else {
+                        BUG_ON(why != RESTART_TRANS);
+
+                        mlog(0, "restarting transaction.\n");
+                        /* TODO: This can be more intelligent. */
+                        credits = ocfs2_calc_extend_credits(osb->sb,
+                                                            fe,
+                                                            clusters_to_add);
+                        status = ocfs2_extend_trans(handle, credits);
+                        if (status < 0) {
+                                /* handle still has to be committed at
+                                 * this point. */
+                                status = -ENOMEM;
+                                mlog_errno(status);
+                                goto leave;
+                        }
+                        goto restarted_transaction;
+                }
+        }
+
+        mlog(0, "fe: i_clusters = %u, i_size=%"MLFu64"\n",
+             fe->i_clusters, fe->i_size);
+        mlog(0, "inode: ip_clusters=%u, i_size=%lld\n",
+             OCFS2_I(inode)->ip_clusters, i_size_read(inode));
+
+leave:
+        if (drop_alloc_sem) {
+                up_write(&OCFS2_I(inode)->ip_alloc_sem);
+                drop_alloc_sem = 0;
+        }
+        if (handle) {
+                ocfs2_commit_trans(handle);
+                handle = NULL;
+        }
+        if (data_ac) {
+                ocfs2_free_alloc_context(data_ac);
+                data_ac = NULL;
+        }
+        if (meta_ac) {
+                ocfs2_free_alloc_context(meta_ac);
+                meta_ac = NULL;
+        }
+        if ((!status) && restart_func) {
+                restart_func = 0;
+                goto restart_all;
+        }
+        if (bh) {
+                brelse(bh);
+                bh = NULL;
+        }
+
+        mlog_exit(status);
+        return status;
+}
+
+/* Some parts of this taken from generic_cont_expand, which turned out
+ * to be too fragile to do exactly what we need without us having to
+ * worry about recursive locking in ->commit_write(). */
+static int ocfs2_write_zero_page(struct inode *inode,
+                                 u64 size)
+{
+        struct address_space *mapping = inode->i_mapping;
+        struct page *page;
+        unsigned long index;
+        unsigned int offset;
+        struct ocfs2_journal_handle *handle = NULL;
+        int ret;
+
+        offset = (size & (PAGE_CACHE_SIZE-1)); /* Within page */
+        /* ugh.  in prepare/commit_write, if from==to==start of block, we 
+        ** skip the prepare.  make sure we never send an offset for the start
+        ** of a block
+        */
+        if ((offset & (inode->i_sb->s_blocksize - 1)) == 0) {
+                offset++;
+        }
+        index = size >> PAGE_CACHE_SHIFT;
+
+        page = grab_cache_page(mapping, index);
+        if (!page) {
+                ret = -ENOMEM;
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = ocfs2_prepare_write(NULL, page, offset, offset);
+        if (ret < 0) {
+                mlog_errno(ret);
+                goto out_unlock;
+        }
+
+        if (ocfs2_should_order_data(inode)) {
+                handle = ocfs2_start_walk_page_trans(inode, page, offset,
+                                                     offset);
+                if (IS_ERR(handle)) {
+                        ret = PTR_ERR(handle);
+                        handle = NULL;
+                        goto out_unlock;
+                }
+        }
+
+        /* must not update i_size! */
+        ret = block_commit_write(page, offset, offset);
+        if (ret < 0)
+                mlog_errno(ret);
+        else
+                ret = 0;
+
+        if (handle)
+                ocfs2_commit_trans(handle);
+out_unlock:
+        unlock_page(page);
+        page_cache_release(page);
+out:
+        return ret;
+}
+
+static int ocfs2_zero_extend(struct inode *inode,
+                             u64 zero_to_size)
+{
+        int ret = 0;
+        u64 start_off;
+        struct super_block *sb = inode->i_sb;
+
+        start_off = ocfs2_align_bytes_to_blocks(sb, i_size_read(inode));
+        while (start_off < zero_to_size) {
+                ret = ocfs2_write_zero_page(inode, start_off);
+                if (ret < 0) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+
+                start_off += sb->s_blocksize;
+        }
+
+out:
+        return ret;
+}
+
+static int ocfs2_extend_file(struct inode *inode,
+                             struct buffer_head *di_bh,
+                             u64 new_i_size)
+{
+        int ret = 0;
+        u32 clusters_to_add;
+
+        /* setattr sometimes calls us like this. */
+        if (new_i_size == 0)
+                goto out;
+
+        if (i_size_read(inode) == new_i_size)
+                goto out;
+        BUG_ON(new_i_size < i_size_read(inode));
+
+        clusters_to_add = ocfs2_clusters_for_bytes(inode->i_sb, new_i_size) - 
+                OCFS2_I(inode)->ip_clusters;
+
+        if (clusters_to_add) {
+                ret = ocfs2_extend_allocation(inode, clusters_to_add);
+                if (ret < 0) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+
+                ret = ocfs2_zero_extend(inode, new_i_size);
+                if (ret < 0) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+        } 
+
+        /* No allocation required, we just use this helper to
+         * do a trivial update of i_size. */
+        ret = ocfs2_simple_size_update(inode, di_bh, new_i_size);
+        if (ret < 0) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+out:
+        return ret;
+}
+
+int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
+{
+        int status = 0, size_change;
+        struct inode *inode = dentry->d_inode;
+        struct super_block *sb = inode->i_sb;
+        struct ocfs2_super *osb = OCFS2_SB(sb);
+        struct buffer_head *bh = NULL;
+        struct ocfs2_journal_handle *handle = NULL;
+
+        mlog_entry("(0x%p, '%.*s')\n", dentry,
+                   dentry->d_name.len, dentry->d_name.name);
+
+        if (attr->ia_valid & ATTR_MODE)
+                mlog(0, "mode change: %d\n", attr->ia_mode);
+        if (attr->ia_valid & ATTR_UID)
+                mlog(0, "uid change: %d\n", attr->ia_uid);
+        if (attr->ia_valid & ATTR_GID)
+                mlog(0, "gid change: %d\n", attr->ia_gid);
+        if (attr->ia_valid & ATTR_SIZE)
+                mlog(0, "size change...\n");
+        if (attr->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME))
+                mlog(0, "time change...\n");
+
+#define OCFS2_VALID_ATTRS (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME | ATTR_SIZE \
+                           | ATTR_GID | ATTR_UID | ATTR_MODE)
+        if (!(attr->ia_valid & OCFS2_VALID_ATTRS)) {
+                mlog(0, "can't handle attrs: 0x%x\n", attr->ia_valid);
+                return 0;
+        }
+
+        status = inode_change_ok(inode, attr);
+        if (status)
+                return status;
+
+        size_change = S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_SIZE;
+        if (size_change) {
+                status = ocfs2_rw_lock(inode, 1);
+                if (status < 0) {
+                        mlog_errno(status);
+                        goto bail;
+                }
+        }
+
+        status = ocfs2_meta_lock(inode, NULL, &bh, 1);
+        if (status < 0) {
+                if (status != -ENOENT)
+                        mlog_errno(status);
+                goto bail_unlock_rw;
+        }
+
+        if (size_change && attr->ia_size != i_size_read(inode)) {
+                if (i_size_read(inode) > attr->ia_size)
+                        status = ocfs2_truncate_file(inode, bh, attr->ia_size);
+                else
+                        status = ocfs2_extend_file(inode, bh, attr->ia_size);
+                if (status < 0) {
+                        if (status != -ENOSPC)
+                                mlog_errno(status);
+                        status = -ENOSPC;
+                        goto bail_unlock;
+                }
+        }
+
+        handle = ocfs2_start_trans(osb, NULL, OCFS2_INODE_UPDATE_CREDITS);
+        if (IS_ERR(handle)) {
+                status = PTR_ERR(handle);
+                mlog_errno(status);
+                goto bail_unlock;
+        }
+
+        status = inode_setattr(inode, attr);
+        if (status < 0) {
+                mlog_errno(status);
+                goto bail_commit;
+        }
+
+        status = ocfs2_mark_inode_dirty(handle, inode, bh);
+        if (status < 0)
+                mlog_errno(status);
+
+bail_commit:
+        ocfs2_commit_trans(handle);
+bail_unlock:
+        ocfs2_meta_unlock(inode, 1);
+bail_unlock_rw:
+        if (size_change)
+                ocfs2_rw_unlock(inode, 1);
+bail:
+        if (bh)
+                brelse(bh);
+
+        mlog_exit(status);
+        return status;
+}
+
+int ocfs2_getattr(struct vfsmount *mnt,
+                  struct dentry *dentry,
+                  struct kstat *stat)
+{
+        struct inode *inode = dentry->d_inode;
+        struct super_block *sb = dentry->d_inode->i_sb;
+        struct ocfs2_super *osb = sb->s_fs_info;
+        int err;
+
+        mlog_entry_void();
+
+        err = ocfs2_inode_revalidate(dentry);
+        if (err) {
+                if (err != -ENOENT)
+                        mlog_errno(err);
+                goto bail;
+        }
+
+        generic_fillattr(inode, stat);
+
+        /* We set the blksize from the cluster size for performance */
+        stat->blksize = osb->s_clustersize;
+
+bail:
+        mlog_exit(err);
+
+        return err;
+}
+
+static int ocfs2_write_remove_suid(struct inode *inode)
+{
+        int ret;
+        struct buffer_head *bh = NULL;
+        struct ocfs2_inode_info *oi = OCFS2_I(inode);
+        struct ocfs2_journal_handle *handle;
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        struct ocfs2_dinode *di;
+
+        mlog_entry("(Inode %"MLFu64", mode 0%o)\n", oi->ip_blkno,
+                   inode->i_mode);
+
+        handle = ocfs2_start_trans(osb, NULL, OCFS2_INODE_UPDATE_CREDITS);
+        if (handle == NULL) {
+                ret = -ENOMEM;
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = ocfs2_read_block(osb, oi->ip_blkno, &bh, OCFS2_BH_CACHED, inode);
+        if (ret < 0) {
+                mlog_errno(ret);
+                goto out_trans;
+        }
+
+        ret = ocfs2_journal_access(handle, inode, bh,
+                                   OCFS2_JOURNAL_ACCESS_WRITE);
+        if (ret < 0) {
+                mlog_errno(ret);
+                goto out_bh;
+        }
+
+        inode->i_mode &= ~S_ISUID;
+        if ((inode->i_mode & S_ISGID) && (inode->i_mode & S_IXGRP))
+                inode->i_mode &= ~S_ISGID;
+
+        di = (struct ocfs2_dinode *) bh->b_data;
+        di->i_mode = cpu_to_le16(inode->i_mode);
+
+        ret = ocfs2_journal_dirty(handle, bh);
+        if (ret < 0)
+                mlog_errno(ret);
+out_bh:
+        brelse(bh);
+out_trans:
+        ocfs2_commit_trans(handle);
+out:
+        mlog_exit(ret);
+        return ret;
+}
+
+static inline int ocfs2_write_should_remove_suid(struct inode *inode)
+{
+        mode_t mode = inode->i_mode;
+
+        if (!capable(CAP_FSETID)) {
+                if (unlikely(mode & S_ISUID))
+                        return 1;
+
+                if (unlikely((mode & S_ISGID) && (mode & S_IXGRP)))
+                        return 1;
+        }
+        return 0;
+}
+
+static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
+                                    const char __user *buf,
+                                    size_t count,
+                                    loff_t pos)
+{
+        struct iovec local_iov = { .iov_base = (void __user *)buf,
+                                   .iov_len = count };
+        int ret, rw_level = -1, meta_level = -1, have_alloc_sem = 0;
+        u32 clusters;
+        struct file *filp = iocb->ki_filp;
+        struct inode *inode = filp->f_dentry->d_inode;
+        loff_t newsize, saved_pos;
+#ifdef OCFS2_ORACORE_WORKAROUNDS
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+#endif
+
+        mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", filp, buf,
+                   (unsigned int)count,
+                   filp->f_dentry->d_name.len,
+                   filp->f_dentry->d_name.name);
+
+        /* happy write of zero bytes */
+        if (count == 0)
+                return 0;
+
+        if (!inode) {
+                mlog(0, "bad inode\n");
+                return -EIO;
+        }
+
+#ifdef OCFS2_ORACORE_WORKAROUNDS
+        /* ugh, work around some applications which open everything O_DIRECT +
+         * O_APPEND and really don't mean to use O_DIRECT. */
+        if (osb->s_mount_opt & OCFS2_MOUNT_COMPAT_OCFS &&
+            (filp->f_flags & O_APPEND) && (filp->f_flags & O_DIRECT)) 
+                filp->f_flags &= ~O_DIRECT;
+#endif
+
+        down(&inode->i_sem);
+        /* to match setattr's i_sem -> i_alloc_sem -> rw_lock ordering */
+        if (filp->f_flags & O_DIRECT) {
+                have_alloc_sem = 1;
+                down_read(&inode->i_alloc_sem);
+        }
+
+        /* concurrent O_DIRECT writes are allowed */
+        rw_level = (filp->f_flags & O_DIRECT) ? 0 : 1;
+        ret = ocfs2_rw_lock(inode, rw_level);
+        if (ret < 0) {
+                rw_level = -1;
+                mlog_errno(ret);
+                goto out;
+        }
+
+        /* 
+         * We sample i_size under a read level meta lock to see if our write
+         * is extending the file, if it is we back off and get a write level
+         * meta lock.
+         */
+        meta_level = (filp->f_flags & O_APPEND) ? 1 : 0;
+        for(;;) {
+                ret = ocfs2_meta_lock(inode, NULL, NULL, meta_level);
+                if (ret < 0) {
+                        meta_level = -1;
+                        mlog_errno(ret);
+                        goto out;
+                }
+
+                /* Clear suid / sgid if necessary. We do this here
+                 * instead of later in the write path because
+                 * remove_suid() calls ->setattr without any hint that
+                 * we may have already done our cluster locking. Since
+                 * ocfs2_setattr() *must* take cluster locks to
+                 * proceeed, this will lead us to recursively lock the
+                 * inode. There's also the dinode i_size state which
+                 * can be lost via setattr during extending writes (we
+                 * set inode->i_size at the end of a write. */
+                if (ocfs2_write_should_remove_suid(inode)) {
+                        if (meta_level == 0) {
+                                ocfs2_meta_unlock(inode, meta_level);
+                                meta_level = 1;
+                                continue;
+                        }
+
+                        ret = ocfs2_write_remove_suid(inode);
+                        if (ret < 0) {
+                                mlog_errno(ret);
+                                goto out;
+                        }
+                }
+
+                /* work on a copy of ppos until we're sure that we won't have
+                 * to recalculate it due to relocking. */
+                if (filp->f_flags & O_APPEND) {
+                        saved_pos = i_size_read(inode);
+                        mlog(0, "O_APPEND: inode->i_size=%llu\n", saved_pos);
+                } else {
+                        saved_pos = iocb->ki_pos;
+                }
+                newsize = count + saved_pos;
+
+                mlog(0, "pos=%lld newsize=%"MLFu64" cursize=%lld\n",
+                     saved_pos, newsize, i_size_read(inode));
+
+                /* No need for a higher level metadata lock if we're
+                 * never going past i_size. */
+                if (newsize <= i_size_read(inode))
+                        break;
+
+                if (meta_level == 0) {
+                        ocfs2_meta_unlock(inode, meta_level);
+                        meta_level = 1;
+                        continue;
+                }
+
+                spin_lock(&OCFS2_I(inode)->ip_lock);
+                clusters = ocfs2_clusters_for_bytes(inode->i_sb, newsize) -
+                        OCFS2_I(inode)->ip_clusters;
+                spin_unlock(&OCFS2_I(inode)->ip_lock);
+
+                mlog(0, "Writing at EOF, may need more allocation: "
+                     "i_size = %lld, newsize = %"MLFu64", need %u clusters\n",
+                     i_size_read(inode), newsize, clusters);
+
+                /* We only want to continue the rest of this loop if
+                 * our extend will actually require more
+                 * allocation. */
+                if (!clusters)
+                        break;
+
+                ret = ocfs2_extend_allocation(inode, clusters);
+                if (ret < 0) {
+                        if (ret != -ENOSPC)
+                                mlog_errno(ret);
+                        goto out;
+                }
+
+                /* Fill any holes which would've been created by this
+                 * write. If we're O_APPEND, this will wind up
+                 * (correctly) being a noop. */
+                ret = ocfs2_zero_extend(inode, (u64) newsize - count);
+                if (ret < 0) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+                break;
+        }
+
+        /* ok, we're done with i_size and alloc work */
+        iocb->ki_pos = saved_pos;
+        ocfs2_meta_unlock(inode, meta_level);
+        meta_level = -1;
+
+        /* communicate with ocfs2_dio_end_io */
+        ocfs2_iocb_set_rw_locked(iocb);
+
+#ifdef OCFS2_ORACORE_WORKAROUNDS
+        if (osb->s_mount_opt & OCFS2_MOUNT_COMPAT_OCFS &&
+            filp->f_flags & O_DIRECT) {
+                unsigned int saved_flags = filp->f_flags;
+                int sector_size = 1 << osb->s_sectsize_bits;
+
+                if ((saved_pos & (sector_size - 1)) ||
+                    (count & (sector_size - 1)) ||
+                    ((unsigned long)buf & (sector_size - 1))) {
+                        filp->f_flags |= O_SYNC;
+                        filp->f_flags &= ~O_DIRECT;
+                }
+
+                ret = generic_file_aio_write_nolock(iocb, &local_iov, 1,
+                                                    &iocb->ki_pos);
+
+                filp->f_flags = saved_flags;
+        } else
+#endif
+                ret = generic_file_aio_write_nolock(iocb, &local_iov, 1,
+                                                    &iocb->ki_pos);
+
+        /* buffered aio wouldn't have proper lock coverage today */
+        BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT));
+
+        /* 
+         * deep in g_f_a_w_n()->ocfs2_direct_IO we pass in a ocfs2_dio_end_io
+         * function pointer which is called when o_direct io completes so that
+         * it can unlock our rw lock.  (it's the clustered equivalent of
+         * i_alloc_sem; protects truncate from racing with pending ios).
+         * Unfortunately there are error cases which call end_io and others
+         * that don't.  so we don't have to unlock the rw_lock if either an
+         * async dio is going to do it in the future or an end_io after an
+         * error has already done it.
+         */
+        if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) {
+                rw_level = -1;
+                have_alloc_sem = 0;
+        }
+
+out:
+        if (meta_level != -1)
+                ocfs2_meta_unlock(inode, meta_level);
+        if (have_alloc_sem)
+                up_read(&inode->i_alloc_sem);
+        if (rw_level != -1) 
+                ocfs2_rw_unlock(inode, rw_level);
+        up(&inode->i_sem);
+
+        mlog_exit(ret);
+        return ret;
+}
+
+static ssize_t ocfs2_file_aio_read(struct kiocb *iocb,
+                                   char __user *buf,
+                                   size_t count,
+                                   loff_t pos)
+{
+        int ret = 0, rw_level = -1, have_alloc_sem = 0;
+        struct file *filp = iocb->ki_filp;
+        struct inode *inode = filp->f_dentry->d_inode;
+#ifdef OCFS2_ORACORE_WORKAROUNDS
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+#endif
+
+        mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", filp, buf,
+                   (unsigned int)count,
+                   filp->f_dentry->d_name.len,
+                   filp->f_dentry->d_name.name);
+
+        if (!inode) {
+                ret = -EINVAL;
+                mlog_errno(ret);
+                goto bail;
+        }
+
+#ifdef OCFS2_ORACORE_WORKAROUNDS
+        if (osb->s_mount_opt & OCFS2_MOUNT_COMPAT_OCFS) {
+                if (filp->f_flags & O_DIRECT) {
+                        int sector_size = 1 << osb->s_sectsize_bits;
+
+                        if ((pos & (sector_size - 1)) ||
+                            (count & (sector_size - 1)) ||
+                            ((unsigned long)buf & (sector_size - 1)) ||
+                            (i_size_read(inode) & (sector_size -1))) {
+                                filp->f_flags &= ~O_DIRECT;
+                        }
+                }
+        }
+#endif
+
+        /* 
+         * buffered reads protect themselves in ->readpage().  O_DIRECT reads
+         * need locks to protect pending reads from racing with truncate.
+         */
+        if (filp->f_flags & O_DIRECT) {
+                down_read(&inode->i_alloc_sem);
+                have_alloc_sem = 1;
+
+                ret = ocfs2_rw_lock(inode, 0);
+                if (ret < 0) {
+                        mlog_errno(ret);
+                        goto bail;
+                }
+                rw_level = 0;
+                /* communicate with ocfs2_dio_end_io */
+                ocfs2_iocb_set_rw_locked(iocb);
+        }
+
+        ret = generic_file_aio_read(iocb, buf, count, iocb->ki_pos);
+        if (ret == -EINVAL)
+                mlog(ML_ERROR, "generic_file_aio_read returned -EINVAL\n");
+
+        /* buffered aio wouldn't have proper lock coverage today */
+        BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT));
+
+        /* see ocfs2_file_aio_write */
+        if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) {
+                rw_level = -1;
+                have_alloc_sem = 0;
+        }
+
+bail:
+        if (have_alloc_sem)
+                up_read(&inode->i_alloc_sem);
+        if (rw_level != -1) 
+                ocfs2_rw_unlock(inode, rw_level);
+        mlog_exit(ret);
+
+        return ret;
+}
+
+struct inode_operations ocfs2_file_iops = {
+        .setattr        = ocfs2_setattr,
+        .getattr        = ocfs2_getattr,
+};
+
+struct inode_operations ocfs2_special_file_iops = {
+        .setattr        = ocfs2_setattr,
+        .getattr        = ocfs2_getattr,
+};
+
+struct file_operations ocfs2_fops = {
+        .read           = do_sync_read,
+        .write          = do_sync_write,
+        .sendfile       = generic_file_sendfile,
+        .mmap           = ocfs2_mmap,
+        .fsync          = ocfs2_sync_file,
+        .release        = ocfs2_file_release,
+        .open           = ocfs2_file_open,
+        .aio_read       = ocfs2_file_aio_read,
+        .aio_write      = ocfs2_file_aio_write,
+};
+
+struct file_operations ocfs2_dops = {
+        .read           = generic_read_dir,
+        .readdir        = ocfs2_readdir,
+        .fsync          = ocfs2_sync_file,
+};