--- /dev/null
+/* -*- 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/capability.h>
+#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 = %llu, new_i_size = %llu\n",
+ (unsigned long long)OCFS2_I(inode)->ip_blkno,
+ (unsigned long long)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 %llu, inode i_size = %lld != di "
+ "i_size = %llu, i_flags = 0x%x\n",
+ (unsigned long long)OCFS2_I(inode)->ip_blkno,
+ i_size_read(inode),
+ (unsigned long long)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 (%llu) to size (%llu)!\n",
+ (unsigned long long)le64_to_cpu(fe->i_size),
+ (unsigned long long)new_i_size);
+ status = -EINVAL;
+ mlog_errno(status);
+ goto bail;
+ }
+
+ mlog(0, "inode %llu, i_size = %llu, new_i_size = %llu\n",
+ (unsigned long long)le64_to_cpu(fe->i_blkno),
+ (unsigned long long)le64_to_cpu(fe->i_size),
+ (unsigned long long)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;
+
+ /* This forces other nodes to sync and drop their pages. Do
+ * this even if we have a truncate without allocation change -
+ * ocfs2 cluster sizes can be much greater than page size, so
+ * we have to truncate them anyway. */
+ status = ocfs2_data_lock(inode, 1);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+ ocfs2_data_unlock(inode, 1);
+
+ 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;
+ }
+
+ /* 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 %llu\n",
+ num_bits, bit_off, (unsigned long long)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 %llu, i_size = %lld, fe->i_clusters = %u, "
+ "clusters_to_add = %u\n",
+ (unsigned long long)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_mutex 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=%llu\n",
+ fe->i_clusters, (unsigned long long)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 ->prepare_write() and
+ * ->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_nolock(inode, 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;
+}
+
+/*
+ * A tail_to_skip value > 0 indicates that we're being called from
+ * ocfs2_file_aio_write(). This has the following implications:
+ *
+ * - we don't want to update i_size
+ * - di_bh will be NULL, which is fine because it's only used in the
+ * case where we want to update i_size.
+ * - ocfs2_zero_extend() will then only be filling the hole created
+ * between i_size and the start of the write.
+ */
+static int ocfs2_extend_file(struct inode *inode,
+ struct buffer_head *di_bh,
+ u64 new_i_size,
+ size_t tail_to_skip)
+{
+ int ret = 0;
+ u32 clusters_to_add;
+
+ BUG_ON(!tail_to_skip && !di_bh);
+
+ /* 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) {
+ /*
+ * protect the pages that ocfs2_zero_extend is going to
+ * be pulling into the page cache.. we do this before the
+ * metadata extend so that we don't get into the situation
+ * where we've extended the metadata but can't get the data
+ * lock to zero.
+ */
+ ret = ocfs2_data_lock(inode, 1);
+ if (ret < 0) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ ret = ocfs2_extend_allocation(inode, clusters_to_add);
+ if (ret < 0) {
+ mlog_errno(ret);
+ goto out_unlock;
+ }
+
+ ret = ocfs2_zero_extend(inode, (u64)new_i_size - tail_to_skip);
+ if (ret < 0) {
+ mlog_errno(ret);
+ goto out_unlock;
+ }
+ }
+
+ if (!tail_to_skip) {
+ /* We're being called from ocfs2_setattr() which wants
+ * us to update i_size */
+ ret = ocfs2_simple_size_update(inode, di_bh, new_i_size);
+ if (ret < 0)
+ mlog_errno(ret);
+ }
+
+out_unlock:
+ if (clusters_to_add) /* this is the only case in which we lock */
+ ocfs2_data_unlock(inode, 1);
+
+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, 0);
+ 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 %llu, mode 0%o)\n",
+ (unsigned long long)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;
+
+ 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;
+ }
+
+ mutex_lock(&inode->i_mutex);
+ /* to match setattr's i_mutex -> 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=%lld cursize=%lld\n",
+ (long long) saved_pos, (long long) newsize,
+ (long long) 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 = %lld, need %u clusters\n",
+ (long long) i_size_read(inode), (long long) 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_file(inode, NULL, newsize, count);
+ if (ret < 0) {
+ if (ret != -ENOSPC)
+ 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);
+
+ 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);
+ mutex_unlock(&inode->i_mutex);
+
+ 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;
+
+ 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;
+ }
+
+ /*
+ * 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);
+ }
+
+ /*
+ * We're fine letting folks race truncates and extending
+ * writes with read across the cluster, just like they can
+ * locally. Hence no rw_lock during read.
+ *
+ * Take and drop the meta data lock to update inode fields
+ * like i_size. This allows the checks down below
+ * generic_file_aio_read() a chance of actually working.
+ */
+ ret = ocfs2_meta_lock(inode, NULL, NULL, 0);
+ if (ret < 0) {
+ mlog_errno(ret);
+ goto bail;
+ }
+ ocfs2_meta_unlock(inode, 0);
+
+ 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,
+};
+
+const 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,
+};
+
+const struct file_operations ocfs2_dops = {
+ .read = generic_read_dir,
+ .readdir = ocfs2_readdir,
+ .fsync = ocfs2_sync_file,
+};
git://git.onelab.eu / linux-2.6.git / blobdiff