![Mark Fasheh](/assets/img/avatar_default.png)
None of these are actually harmful, but the noise makes looking for real problems difficult. Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
1873 lines
44 KiB
C
1873 lines
44 KiB
C
/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* file.c
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*
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* File open, close, extend, truncate
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*
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* Copyright (C) 2002, 2004 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include <linux/capability.h>
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#include <linux/fs.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/highmem.h>
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#include <linux/pagemap.h>
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#include <linux/uio.h>
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#include <linux/sched.h>
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#include <linux/pipe_fs_i.h>
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#include <linux/mount.h>
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#include <linux/writeback.h>
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#define MLOG_MASK_PREFIX ML_INODE
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#include <cluster/masklog.h>
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#include "ocfs2.h"
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#include "alloc.h"
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#include "aops.h"
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#include "dir.h"
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#include "dlmglue.h"
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#include "extent_map.h"
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#include "file.h"
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#include "sysfile.h"
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#include "inode.h"
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#include "ioctl.h"
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#include "journal.h"
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#include "mmap.h"
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#include "suballoc.h"
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#include "super.h"
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#include "buffer_head_io.h"
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static int ocfs2_sync_inode(struct inode *inode)
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{
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filemap_fdatawrite(inode->i_mapping);
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return sync_mapping_buffers(inode->i_mapping);
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}
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static int ocfs2_file_open(struct inode *inode, struct file *file)
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{
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int status;
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int mode = file->f_flags;
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struct ocfs2_inode_info *oi = OCFS2_I(inode);
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mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file,
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file->f_path.dentry->d_name.len, file->f_path.dentry->d_name.name);
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spin_lock(&oi->ip_lock);
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/* Check that the inode hasn't been wiped from disk by another
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* node. If it hasn't then we're safe as long as we hold the
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* spin lock until our increment of open count. */
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if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) {
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spin_unlock(&oi->ip_lock);
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status = -ENOENT;
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goto leave;
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}
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if (mode & O_DIRECT)
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oi->ip_flags |= OCFS2_INODE_OPEN_DIRECT;
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oi->ip_open_count++;
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spin_unlock(&oi->ip_lock);
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status = 0;
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leave:
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mlog_exit(status);
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return status;
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}
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static int ocfs2_file_release(struct inode *inode, struct file *file)
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{
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struct ocfs2_inode_info *oi = OCFS2_I(inode);
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mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file,
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file->f_path.dentry->d_name.len,
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file->f_path.dentry->d_name.name);
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spin_lock(&oi->ip_lock);
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if (!--oi->ip_open_count)
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oi->ip_flags &= ~OCFS2_INODE_OPEN_DIRECT;
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spin_unlock(&oi->ip_lock);
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mlog_exit(0);
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return 0;
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}
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static int ocfs2_sync_file(struct file *file,
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struct dentry *dentry,
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int datasync)
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{
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int err = 0;
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journal_t *journal;
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struct inode *inode = dentry->d_inode;
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struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
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mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", file, dentry, datasync,
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dentry->d_name.len, dentry->d_name.name);
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err = ocfs2_sync_inode(dentry->d_inode);
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if (err)
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goto bail;
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journal = osb->journal->j_journal;
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err = journal_force_commit(journal);
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bail:
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mlog_exit(err);
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return (err < 0) ? -EIO : 0;
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}
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int ocfs2_should_update_atime(struct inode *inode,
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struct vfsmount *vfsmnt)
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{
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struct timespec now;
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struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
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if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
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return 0;
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if ((inode->i_flags & S_NOATIME) ||
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((inode->i_sb->s_flags & MS_NODIRATIME) && S_ISDIR(inode->i_mode)))
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return 0;
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/*
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* We can be called with no vfsmnt structure - NFSD will
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* sometimes do this.
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*
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* Note that our action here is different than touch_atime() -
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* if we can't tell whether this is a noatime mount, then we
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* don't know whether to trust the value of s_atime_quantum.
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*/
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if (vfsmnt == NULL)
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return 0;
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if ((vfsmnt->mnt_flags & MNT_NOATIME) ||
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((vfsmnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
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return 0;
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if (vfsmnt->mnt_flags & MNT_RELATIME) {
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if ((timespec_compare(&inode->i_atime, &inode->i_mtime) <= 0) ||
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(timespec_compare(&inode->i_atime, &inode->i_ctime) <= 0))
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return 1;
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return 0;
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}
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now = CURRENT_TIME;
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if ((now.tv_sec - inode->i_atime.tv_sec <= osb->s_atime_quantum))
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return 0;
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else
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return 1;
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}
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int ocfs2_update_inode_atime(struct inode *inode,
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struct buffer_head *bh)
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{
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int ret;
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struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
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handle_t *handle;
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mlog_entry_void();
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handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
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if (handle == NULL) {
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ret = -ENOMEM;
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mlog_errno(ret);
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goto out;
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}
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inode->i_atime = CURRENT_TIME;
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ret = ocfs2_mark_inode_dirty(handle, inode, bh);
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if (ret < 0)
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mlog_errno(ret);
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ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
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out:
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mlog_exit(ret);
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return ret;
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}
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static int ocfs2_set_inode_size(handle_t *handle,
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struct inode *inode,
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struct buffer_head *fe_bh,
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u64 new_i_size)
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{
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int status;
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mlog_entry_void();
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i_size_write(inode, new_i_size);
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inode->i_blocks = ocfs2_inode_sector_count(inode);
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inode->i_ctime = inode->i_mtime = CURRENT_TIME;
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status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
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if (status < 0) {
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mlog_errno(status);
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goto bail;
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}
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bail:
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mlog_exit(status);
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return status;
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}
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static int ocfs2_simple_size_update(struct inode *inode,
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struct buffer_head *di_bh,
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u64 new_i_size)
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{
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int ret;
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struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
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handle_t *handle = NULL;
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handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
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if (handle == NULL) {
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ret = -ENOMEM;
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mlog_errno(ret);
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goto out;
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}
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ret = ocfs2_set_inode_size(handle, inode, di_bh,
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new_i_size);
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if (ret < 0)
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mlog_errno(ret);
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ocfs2_commit_trans(osb, handle);
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out:
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return ret;
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}
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static int ocfs2_orphan_for_truncate(struct ocfs2_super *osb,
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struct inode *inode,
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struct buffer_head *fe_bh,
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u64 new_i_size)
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{
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int status;
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handle_t *handle;
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struct ocfs2_dinode *di;
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mlog_entry_void();
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/* TODO: This needs to actually orphan the inode in this
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* transaction. */
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handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
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if (IS_ERR(handle)) {
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status = PTR_ERR(handle);
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mlog_errno(status);
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goto out;
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}
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status = ocfs2_journal_access(handle, inode, fe_bh,
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OCFS2_JOURNAL_ACCESS_WRITE);
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if (status < 0) {
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mlog_errno(status);
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goto out_commit;
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}
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/*
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* Do this before setting i_size.
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*/
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status = ocfs2_zero_tail_for_truncate(inode, handle, new_i_size);
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if (status) {
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mlog_errno(status);
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goto out_commit;
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}
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i_size_write(inode, new_i_size);
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inode->i_blocks = ocfs2_align_bytes_to_sectors(new_i_size);
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inode->i_ctime = inode->i_mtime = CURRENT_TIME;
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di = (struct ocfs2_dinode *) fe_bh->b_data;
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di->i_size = cpu_to_le64(new_i_size);
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di->i_ctime = di->i_mtime = cpu_to_le64(inode->i_ctime.tv_sec);
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di->i_ctime_nsec = di->i_mtime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
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status = ocfs2_journal_dirty(handle, fe_bh);
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if (status < 0)
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mlog_errno(status);
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out_commit:
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ocfs2_commit_trans(osb, handle);
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out:
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mlog_exit(status);
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return status;
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}
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static int ocfs2_truncate_file(struct inode *inode,
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struct buffer_head *di_bh,
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u64 new_i_size)
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{
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int status = 0;
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struct ocfs2_dinode *fe = NULL;
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struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
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struct ocfs2_truncate_context *tc = NULL;
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|
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mlog_entry("(inode = %llu, new_i_size = %llu\n",
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(unsigned long long)OCFS2_I(inode)->ip_blkno,
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(unsigned long long)new_i_size);
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|
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truncate_inode_pages(inode->i_mapping, new_i_size);
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|
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fe = (struct ocfs2_dinode *) di_bh->b_data;
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if (!OCFS2_IS_VALID_DINODE(fe)) {
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OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe);
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status = -EIO;
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goto bail;
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}
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|
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mlog_bug_on_msg(le64_to_cpu(fe->i_size) != i_size_read(inode),
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"Inode %llu, inode i_size = %lld != di "
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"i_size = %llu, i_flags = 0x%x\n",
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(unsigned long long)OCFS2_I(inode)->ip_blkno,
|
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i_size_read(inode),
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(unsigned long long)le64_to_cpu(fe->i_size),
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le32_to_cpu(fe->i_flags));
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|
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if (new_i_size > le64_to_cpu(fe->i_size)) {
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mlog(0, "asked to truncate file with size (%llu) to size (%llu)!\n",
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(unsigned long long)le64_to_cpu(fe->i_size),
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(unsigned long long)new_i_size);
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|
status = -EINVAL;
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|
mlog_errno(status);
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goto bail;
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|
}
|
|
|
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mlog(0, "inode %llu, i_size = %llu, new_i_size = %llu\n",
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(unsigned long long)le64_to_cpu(fe->i_blkno),
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(unsigned long long)le64_to_cpu(fe->i_size),
|
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(unsigned long long)new_i_size);
|
|
|
|
/* lets handle the simple truncate cases before doing any more
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* cluster locking. */
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if (new_i_size == le64_to_cpu(fe->i_size))
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goto bail;
|
|
|
|
/* This forces other nodes to sync and drop their pages. Do
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* this even if we have a truncate without allocation change -
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* ocfs2 cluster sizes can be much greater than page size, so
|
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* we have to truncate them anyway. */
|
|
status = ocfs2_data_lock(inode, 1);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
/* alright, we're going to need to do a full blown alloc size
|
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* change. Orphan the inode so that recovery can complete the
|
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* truncate if necessary. This does the task of marking
|
|
* i_size. */
|
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status = ocfs2_orphan_for_truncate(osb, inode, di_bh, new_i_size);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail_unlock_data;
|
|
}
|
|
|
|
status = ocfs2_prepare_truncate(osb, inode, di_bh, &tc);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail_unlock_data;
|
|
}
|
|
|
|
status = ocfs2_commit_truncate(osb, inode, di_bh, tc);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail_unlock_data;
|
|
}
|
|
|
|
/* TODO: orphan dir cleanup here. */
|
|
bail_unlock_data:
|
|
ocfs2_data_unlock(inode, 1);
|
|
|
|
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 *logical_offset,
|
|
u32 clusters_to_add,
|
|
struct buffer_head *fe_bh,
|
|
handle_t *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,
|
|
*logical_offset, block, num_bits,
|
|
meta_ac);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto leave;
|
|
}
|
|
|
|
status = ocfs2_journal_dirty(handle, fe_bh);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto leave;
|
|
}
|
|
|
|
clusters_to_add -= num_bits;
|
|
*logical_offset += 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;
|
|
}
|
|
|
|
/*
|
|
* For a given allocation, determine which allocators will need to be
|
|
* accessed, and lock them, reserving the appropriate number of bits.
|
|
*
|
|
* Called from ocfs2_extend_allocation() for file systems which don't
|
|
* support holes, and from ocfs2_write() for file systems which
|
|
* understand sparse inodes.
|
|
*/
|
|
int ocfs2_lock_allocators(struct inode *inode, struct ocfs2_dinode *di,
|
|
u32 clusters_to_add,
|
|
struct ocfs2_alloc_context **data_ac,
|
|
struct ocfs2_alloc_context **meta_ac)
|
|
{
|
|
int ret, num_free_extents;
|
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
|
|
|
|
*meta_ac = NULL;
|
|
*data_ac = NULL;
|
|
|
|
mlog(0, "extend inode %llu, i_size = %lld, di->i_clusters = %u, "
|
|
"clusters_to_add = %u\n",
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno, i_size_read(inode),
|
|
le32_to_cpu(di->i_clusters), clusters_to_add);
|
|
|
|
num_free_extents = ocfs2_num_free_extents(osb, inode, di);
|
|
if (num_free_extents < 0) {
|
|
ret = num_free_extents;
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Sparse allocation file systems need to be more conservative
|
|
* with reserving room for expansion - the actual allocation
|
|
* happens while we've got a journal handle open so re-taking
|
|
* a cluster lock (because we ran out of room for another
|
|
* extent) will violate ordering rules.
|
|
*
|
|
* Most of the time we'll only be seeing this 1 cluster at a time
|
|
* anyway.
|
|
*/
|
|
if (!num_free_extents ||
|
|
(ocfs2_sparse_alloc(osb) && num_free_extents < clusters_to_add)) {
|
|
ret = ocfs2_reserve_new_metadata(osb, di, meta_ac);
|
|
if (ret < 0) {
|
|
if (ret != -ENOSPC)
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
ret = ocfs2_reserve_clusters(osb, clusters_to_add, data_ac);
|
|
if (ret < 0) {
|
|
if (ret != -ENOSPC)
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
if (ret) {
|
|
if (*meta_ac) {
|
|
ocfs2_free_alloc_context(*meta_ac);
|
|
*meta_ac = NULL;
|
|
}
|
|
|
|
/*
|
|
* We cannot have an error and a non null *data_ac.
|
|
*/
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
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;
|
|
u32 prev_clusters, logical_start;
|
|
struct buffer_head *bh = NULL;
|
|
struct ocfs2_dinode *fe = NULL;
|
|
handle_t *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);
|
|
|
|
/*
|
|
* This function only exists for file systems which don't
|
|
* support holes.
|
|
*/
|
|
BUG_ON(ocfs2_sparse_alloc(osb));
|
|
|
|
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;
|
|
}
|
|
|
|
logical_start = OCFS2_I(inode)->ip_clusters;
|
|
|
|
restart_all:
|
|
BUG_ON(le32_to_cpu(fe->i_clusters) != OCFS2_I(inode)->ip_clusters);
|
|
|
|
/* 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;
|
|
|
|
status = ocfs2_lock_allocators(inode, fe, clusters_to_add, &data_ac,
|
|
&meta_ac);
|
|
if (status) {
|
|
mlog_errno(status);
|
|
goto leave;
|
|
}
|
|
|
|
credits = ocfs2_calc_extend_credits(osb->sb, fe, clusters_to_add);
|
|
handle = ocfs2_start_trans(osb, 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,
|
|
&logical_start,
|
|
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",
|
|
le32_to_cpu(fe->i_clusters),
|
|
(unsigned long long)le64_to_cpu(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(osb, 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;
|
|
handle_t *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(OCFS2_SB(inode->i_sb), 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;
|
|
|
|
/*
|
|
* Very large extends have the potential to lock up
|
|
* the cpu for extended periods of time.
|
|
*/
|
|
cond_resched();
|
|
}
|
|
|
|
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 = 0;
|
|
|
|
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));
|
|
|
|
if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) {
|
|
BUG_ON(tail_to_skip != 0);
|
|
goto out_update_size;
|
|
}
|
|
|
|
clusters_to_add = ocfs2_clusters_for_bytes(inode->i_sb, new_i_size) -
|
|
OCFS2_I(inode)->ip_clusters;
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
if (clusters_to_add) {
|
|
ret = ocfs2_extend_allocation(inode, clusters_to_add);
|
|
if (ret < 0) {
|
|
mlog_errno(ret);
|
|
goto out_unlock;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Call this even if we don't add any clusters to the tree. We
|
|
* still need to zero the area between the old i_size and the
|
|
* new i_size.
|
|
*/
|
|
ret = ocfs2_zero_extend(inode, (u64)new_i_size - tail_to_skip);
|
|
if (ret < 0) {
|
|
mlog_errno(ret);
|
|
goto out_unlock;
|
|
}
|
|
|
|
out_update_size:
|
|
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 (!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
|
|
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;
|
|
handle_t *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, &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, 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(osb, 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;
|
|
}
|
|
|
|
int ocfs2_permission(struct inode *inode, int mask, struct nameidata *nd)
|
|
{
|
|
int ret;
|
|
|
|
mlog_entry_void();
|
|
|
|
ret = ocfs2_meta_lock(inode, NULL, 0);
|
|
if (ret) {
|
|
if (ret != -ENOENT)
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ret = generic_permission(inode, mask, NULL);
|
|
|
|
ocfs2_meta_unlock(inode, 0);
|
|
out:
|
|
mlog_exit(ret);
|
|
return ret;
|
|
}
|
|
|
|
static int ocfs2_write_remove_suid(struct inode *inode)
|
|
{
|
|
int ret;
|
|
struct buffer_head *bh = NULL;
|
|
struct ocfs2_inode_info *oi = OCFS2_I(inode);
|
|
handle_t *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, 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(osb, handle);
|
|
out:
|
|
mlog_exit(ret);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Will look for holes and unwritten extents in the range starting at
|
|
* pos for count bytes (inclusive).
|
|
*/
|
|
static int ocfs2_check_range_for_holes(struct inode *inode, loff_t pos,
|
|
size_t count)
|
|
{
|
|
int ret = 0;
|
|
unsigned int extent_flags;
|
|
u32 cpos, clusters, extent_len, phys_cpos;
|
|
struct super_block *sb = inode->i_sb;
|
|
|
|
cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits;
|
|
clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos;
|
|
|
|
while (clusters) {
|
|
ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len,
|
|
&extent_flags);
|
|
if (ret < 0) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
if (phys_cpos == 0 || (extent_flags & OCFS2_EXT_UNWRITTEN)) {
|
|
ret = 1;
|
|
break;
|
|
}
|
|
|
|
if (extent_len > clusters)
|
|
extent_len = clusters;
|
|
|
|
clusters -= extent_len;
|
|
cpos += extent_len;
|
|
}
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int ocfs2_prepare_inode_for_write(struct dentry *dentry,
|
|
loff_t *ppos,
|
|
size_t count,
|
|
int appending,
|
|
int *direct_io)
|
|
{
|
|
int ret = 0, meta_level = appending;
|
|
struct inode *inode = dentry->d_inode;
|
|
u32 clusters;
|
|
loff_t newsize, saved_pos;
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
for(;;) {
|
|
ret = ocfs2_meta_lock(inode, 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 (should_remove_suid(dentry)) {
|
|
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_unlock;
|
|
}
|
|
}
|
|
|
|
/* work on a copy of ppos until we're sure that we won't have
|
|
* to recalculate it due to relocking. */
|
|
if (appending) {
|
|
saved_pos = i_size_read(inode);
|
|
mlog(0, "O_APPEND: inode->i_size=%llu\n", saved_pos);
|
|
} else {
|
|
saved_pos = *ppos;
|
|
}
|
|
|
|
if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) {
|
|
loff_t end = saved_pos + count;
|
|
|
|
/*
|
|
* Skip the O_DIRECT checks if we don't need
|
|
* them.
|
|
*/
|
|
if (!direct_io || !(*direct_io))
|
|
break;
|
|
|
|
/*
|
|
* Allowing concurrent direct writes means
|
|
* i_size changes wouldn't be synchronized, so
|
|
* one node could wind up truncating another
|
|
* nodes writes.
|
|
*/
|
|
if (end > i_size_read(inode)) {
|
|
*direct_io = 0;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* We don't fill holes during direct io, so
|
|
* check for them here. If any are found, the
|
|
* caller will have to retake some cluster
|
|
* locks and initiate the io as buffered.
|
|
*/
|
|
ret = ocfs2_check_range_for_holes(inode, saved_pos,
|
|
count);
|
|
if (ret == 1) {
|
|
*direct_io = 0;
|
|
ret = 0;
|
|
} else if (ret < 0)
|
|
mlog_errno(ret);
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* The rest of this loop is concerned with legacy file
|
|
* systems which don't support sparse files.
|
|
*/
|
|
|
|
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_unlock;
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (appending)
|
|
*ppos = saved_pos;
|
|
|
|
out_unlock:
|
|
ocfs2_meta_unlock(inode, meta_level);
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static inline void
|
|
ocfs2_set_next_iovec(const struct iovec **iovp, size_t *basep, size_t bytes)
|
|
{
|
|
const struct iovec *iov = *iovp;
|
|
size_t base = *basep;
|
|
|
|
do {
|
|
int copy = min(bytes, iov->iov_len - base);
|
|
|
|
bytes -= copy;
|
|
base += copy;
|
|
if (iov->iov_len == base) {
|
|
iov++;
|
|
base = 0;
|
|
}
|
|
} while (bytes);
|
|
*iovp = iov;
|
|
*basep = base;
|
|
}
|
|
|
|
static struct page * ocfs2_get_write_source(struct ocfs2_buffered_write_priv *bp,
|
|
const struct iovec *cur_iov,
|
|
size_t iov_offset)
|
|
{
|
|
int ret;
|
|
char *buf;
|
|
struct page *src_page = NULL;
|
|
|
|
buf = cur_iov->iov_base + iov_offset;
|
|
|
|
if (!segment_eq(get_fs(), KERNEL_DS)) {
|
|
/*
|
|
* Pull in the user page. We want to do this outside
|
|
* of the meta data locks in order to preserve locking
|
|
* order in case of page fault.
|
|
*/
|
|
ret = get_user_pages(current, current->mm,
|
|
(unsigned long)buf & PAGE_CACHE_MASK, 1,
|
|
0, 0, &src_page, NULL);
|
|
if (ret == 1)
|
|
bp->b_src_buf = kmap(src_page);
|
|
else
|
|
src_page = ERR_PTR(-EFAULT);
|
|
} else {
|
|
bp->b_src_buf = buf;
|
|
}
|
|
|
|
return src_page;
|
|
}
|
|
|
|
static void ocfs2_put_write_source(struct ocfs2_buffered_write_priv *bp,
|
|
struct page *page)
|
|
{
|
|
if (page) {
|
|
kunmap(page);
|
|
page_cache_release(page);
|
|
}
|
|
}
|
|
|
|
static ssize_t ocfs2_file_buffered_write(struct file *file, loff_t *ppos,
|
|
const struct iovec *iov,
|
|
unsigned long nr_segs,
|
|
size_t count,
|
|
ssize_t o_direct_written)
|
|
{
|
|
int ret = 0;
|
|
ssize_t copied, total = 0;
|
|
size_t iov_offset = 0;
|
|
const struct iovec *cur_iov = iov;
|
|
struct ocfs2_buffered_write_priv bp;
|
|
struct page *page;
|
|
|
|
/*
|
|
* handle partial DIO write. Adjust cur_iov if needed.
|
|
*/
|
|
ocfs2_set_next_iovec(&cur_iov, &iov_offset, o_direct_written);
|
|
|
|
do {
|
|
bp.b_cur_off = iov_offset;
|
|
bp.b_cur_iov = cur_iov;
|
|
|
|
page = ocfs2_get_write_source(&bp, cur_iov, iov_offset);
|
|
if (IS_ERR(page)) {
|
|
ret = PTR_ERR(page);
|
|
goto out;
|
|
}
|
|
|
|
copied = ocfs2_buffered_write_cluster(file, *ppos, count,
|
|
ocfs2_map_and_write_user_data,
|
|
&bp);
|
|
|
|
ocfs2_put_write_source(&bp, page);
|
|
|
|
if (copied < 0) {
|
|
mlog_errno(copied);
|
|
ret = copied;
|
|
goto out;
|
|
}
|
|
|
|
total += copied;
|
|
*ppos = *ppos + copied;
|
|
count -= copied;
|
|
|
|
ocfs2_set_next_iovec(&cur_iov, &iov_offset, copied);
|
|
} while(count);
|
|
|
|
out:
|
|
return total ? total : ret;
|
|
}
|
|
|
|
static int ocfs2_check_iovec(const struct iovec *iov, size_t *counted,
|
|
unsigned long *nr_segs)
|
|
{
|
|
size_t ocount; /* original count */
|
|
unsigned long seg;
|
|
|
|
ocount = 0;
|
|
for (seg = 0; seg < *nr_segs; seg++) {
|
|
const struct iovec *iv = &iov[seg];
|
|
|
|
/*
|
|
* If any segment has a negative length, or the cumulative
|
|
* length ever wraps negative then return -EINVAL.
|
|
*/
|
|
ocount += iv->iov_len;
|
|
if (unlikely((ssize_t)(ocount|iv->iov_len) < 0))
|
|
return -EINVAL;
|
|
if (access_ok(VERIFY_READ, iv->iov_base, iv->iov_len))
|
|
continue;
|
|
if (seg == 0)
|
|
return -EFAULT;
|
|
*nr_segs = seg;
|
|
ocount -= iv->iov_len; /* This segment is no good */
|
|
break;
|
|
}
|
|
|
|
*counted = ocount;
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
|
|
const struct iovec *iov,
|
|
unsigned long nr_segs,
|
|
loff_t pos)
|
|
{
|
|
int ret, direct_io, appending, rw_level, have_alloc_sem = 0;
|
|
int can_do_direct, sync = 0;
|
|
ssize_t written = 0;
|
|
size_t ocount; /* original count */
|
|
size_t count; /* after file limit checks */
|
|
loff_t *ppos = &iocb->ki_pos;
|
|
struct file *file = iocb->ki_filp;
|
|
struct inode *inode = file->f_path.dentry->d_inode;
|
|
|
|
mlog_entry("(0x%p, %u, '%.*s')\n", file,
|
|
(unsigned int)nr_segs,
|
|
file->f_path.dentry->d_name.len,
|
|
file->f_path.dentry->d_name.name);
|
|
|
|
if (iocb->ki_left == 0)
|
|
return 0;
|
|
|
|
ret = ocfs2_check_iovec(iov, &ocount, &nr_segs);
|
|
if (ret)
|
|
return ret;
|
|
|
|
count = ocount;
|
|
|
|
vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
|
|
|
|
appending = file->f_flags & O_APPEND ? 1 : 0;
|
|
direct_io = file->f_flags & O_DIRECT ? 1 : 0;
|
|
|
|
mutex_lock(&inode->i_mutex);
|
|
|
|
relock:
|
|
/* to match setattr's i_mutex -> i_alloc_sem -> rw_lock ordering */
|
|
if (direct_io) {
|
|
down_read(&inode->i_alloc_sem);
|
|
have_alloc_sem = 1;
|
|
}
|
|
|
|
/* concurrent O_DIRECT writes are allowed */
|
|
rw_level = !direct_io;
|
|
ret = ocfs2_rw_lock(inode, rw_level);
|
|
if (ret < 0) {
|
|
mlog_errno(ret);
|
|
goto out_sems;
|
|
}
|
|
|
|
can_do_direct = direct_io;
|
|
ret = ocfs2_prepare_inode_for_write(file->f_path.dentry, ppos,
|
|
iocb->ki_left, appending,
|
|
&can_do_direct);
|
|
if (ret < 0) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* We can't complete the direct I/O as requested, fall back to
|
|
* buffered I/O.
|
|
*/
|
|
if (direct_io && !can_do_direct) {
|
|
ocfs2_rw_unlock(inode, rw_level);
|
|
up_read(&inode->i_alloc_sem);
|
|
|
|
have_alloc_sem = 0;
|
|
rw_level = -1;
|
|
|
|
direct_io = 0;
|
|
sync = 1;
|
|
goto relock;
|
|
}
|
|
|
|
if (!sync && ((file->f_flags & O_SYNC) || IS_SYNC(inode)))
|
|
sync = 1;
|
|
|
|
/*
|
|
* XXX: Is it ok to execute these checks a second time?
|
|
*/
|
|
ret = generic_write_checks(file, ppos, &count, S_ISBLK(inode->i_mode));
|
|
if (ret)
|
|
goto out;
|
|
|
|
/*
|
|
* Set pos so that sync_page_range_nolock() below understands
|
|
* where to start from. We might've moved it around via the
|
|
* calls above. The range we want to actually sync starts from
|
|
* *ppos here.
|
|
*
|
|
*/
|
|
pos = *ppos;
|
|
|
|
/* communicate with ocfs2_dio_end_io */
|
|
ocfs2_iocb_set_rw_locked(iocb, rw_level);
|
|
|
|
if (direct_io) {
|
|
written = generic_file_direct_write(iocb, iov, &nr_segs, *ppos,
|
|
ppos, count, ocount);
|
|
if (written < 0) {
|
|
ret = written;
|
|
goto out_dio;
|
|
}
|
|
} else {
|
|
written = ocfs2_file_buffered_write(file, ppos, iov, nr_segs,
|
|
count, written);
|
|
if (written < 0) {
|
|
ret = written;
|
|
if (ret != -EFAULT || ret != -ENOSPC)
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
out_dio:
|
|
/* buffered aio wouldn't have proper lock coverage today */
|
|
BUG_ON(ret == -EIOCBQUEUED && !(file->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 (rw_level != -1)
|
|
ocfs2_rw_unlock(inode, rw_level);
|
|
|
|
out_sems:
|
|
if (have_alloc_sem)
|
|
up_read(&inode->i_alloc_sem);
|
|
|
|
if (written > 0 && sync) {
|
|
ssize_t err;
|
|
|
|
err = sync_page_range_nolock(inode, file->f_mapping, pos, count);
|
|
if (err < 0)
|
|
written = err;
|
|
}
|
|
|
|
mutex_unlock(&inode->i_mutex);
|
|
|
|
mlog_exit(ret);
|
|
return written ? written : ret;
|
|
}
|
|
|
|
static int ocfs2_splice_write_actor(struct pipe_inode_info *pipe,
|
|
struct pipe_buffer *buf,
|
|
struct splice_desc *sd)
|
|
{
|
|
int ret, count, total = 0;
|
|
ssize_t copied = 0;
|
|
struct ocfs2_splice_write_priv sp;
|
|
|
|
ret = buf->ops->pin(pipe, buf);
|
|
if (ret)
|
|
goto out;
|
|
|
|
sp.s_sd = sd;
|
|
sp.s_buf = buf;
|
|
sp.s_pipe = pipe;
|
|
sp.s_offset = sd->pos & ~PAGE_CACHE_MASK;
|
|
sp.s_buf_offset = buf->offset;
|
|
|
|
count = sd->len;
|
|
if (count + sp.s_offset > PAGE_CACHE_SIZE)
|
|
count = PAGE_CACHE_SIZE - sp.s_offset;
|
|
|
|
do {
|
|
/*
|
|
* splice wants us to copy up to one page at a
|
|
* time. For pagesize > cluster size, this means we
|
|
* might enter ocfs2_buffered_write_cluster() more
|
|
* than once, so keep track of our progress here.
|
|
*/
|
|
copied = ocfs2_buffered_write_cluster(sd->file,
|
|
(loff_t)sd->pos + total,
|
|
count,
|
|
ocfs2_map_and_write_splice_data,
|
|
&sp);
|
|
if (copied < 0) {
|
|
mlog_errno(copied);
|
|
ret = copied;
|
|
goto out;
|
|
}
|
|
|
|
count -= copied;
|
|
sp.s_offset += copied;
|
|
sp.s_buf_offset += copied;
|
|
total += copied;
|
|
} while (count);
|
|
|
|
ret = 0;
|
|
out:
|
|
|
|
return total ? total : ret;
|
|
}
|
|
|
|
static ssize_t __ocfs2_file_splice_write(struct pipe_inode_info *pipe,
|
|
struct file *out,
|
|
loff_t *ppos,
|
|
size_t len,
|
|
unsigned int flags)
|
|
{
|
|
int ret, err;
|
|
struct address_space *mapping = out->f_mapping;
|
|
struct inode *inode = mapping->host;
|
|
|
|
ret = __splice_from_pipe(pipe, out, ppos, len, flags,
|
|
ocfs2_splice_write_actor);
|
|
if (ret > 0) {
|
|
*ppos += ret;
|
|
|
|
if (unlikely((out->f_flags & O_SYNC) || IS_SYNC(inode))) {
|
|
err = generic_osync_inode(inode, mapping,
|
|
OSYNC_METADATA|OSYNC_DATA);
|
|
if (err)
|
|
ret = err;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t ocfs2_file_splice_write(struct pipe_inode_info *pipe,
|
|
struct file *out,
|
|
loff_t *ppos,
|
|
size_t len,
|
|
unsigned int flags)
|
|
{
|
|
int ret;
|
|
struct inode *inode = out->f_path.dentry->d_inode;
|
|
|
|
mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", out, pipe,
|
|
(unsigned int)len,
|
|
out->f_path.dentry->d_name.len,
|
|
out->f_path.dentry->d_name.name);
|
|
|
|
inode_double_lock(inode, pipe->inode);
|
|
|
|
ret = ocfs2_rw_lock(inode, 1);
|
|
if (ret < 0) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ret = ocfs2_prepare_inode_for_write(out->f_path.dentry, ppos, len, 0,
|
|
NULL);
|
|
if (ret < 0) {
|
|
mlog_errno(ret);
|
|
goto out_unlock;
|
|
}
|
|
|
|
/* ok, we're done with i_size and alloc work */
|
|
ret = __ocfs2_file_splice_write(pipe, out, ppos, len, flags);
|
|
|
|
out_unlock:
|
|
ocfs2_rw_unlock(inode, 1);
|
|
out:
|
|
inode_double_unlock(inode, pipe->inode);
|
|
|
|
mlog_exit(ret);
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t ocfs2_file_splice_read(struct file *in,
|
|
loff_t *ppos,
|
|
struct pipe_inode_info *pipe,
|
|
size_t len,
|
|
unsigned int flags)
|
|
{
|
|
int ret = 0;
|
|
struct inode *inode = in->f_path.dentry->d_inode;
|
|
|
|
mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", in, pipe,
|
|
(unsigned int)len,
|
|
in->f_path.dentry->d_name.len,
|
|
in->f_path.dentry->d_name.name);
|
|
|
|
/*
|
|
* See the comment in ocfs2_file_aio_read()
|
|
*/
|
|
ret = ocfs2_meta_lock(inode, NULL, 0);
|
|
if (ret < 0) {
|
|
mlog_errno(ret);
|
|
goto bail;
|
|
}
|
|
ocfs2_meta_unlock(inode, 0);
|
|
|
|
ret = generic_file_splice_read(in, ppos, pipe, len, flags);
|
|
|
|
bail:
|
|
mlog_exit(ret);
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t ocfs2_file_aio_read(struct kiocb *iocb,
|
|
const struct iovec *iov,
|
|
unsigned long nr_segs,
|
|
loff_t pos)
|
|
{
|
|
int ret = 0, rw_level = -1, have_alloc_sem = 0, lock_level = 0;
|
|
struct file *filp = iocb->ki_filp;
|
|
struct inode *inode = filp->f_path.dentry->d_inode;
|
|
|
|
mlog_entry("(0x%p, %u, '%.*s')\n", filp,
|
|
(unsigned int)nr_segs,
|
|
filp->f_path.dentry->d_name.len,
|
|
filp->f_path.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, rw_level);
|
|
}
|
|
|
|
/*
|
|
* 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_atime(inode, filp->f_vfsmnt, &lock_level);
|
|
if (ret < 0) {
|
|
mlog_errno(ret);
|
|
goto bail;
|
|
}
|
|
ocfs2_meta_unlock(inode, lock_level);
|
|
|
|
ret = generic_file_aio_read(iocb, iov, nr_segs, 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;
|
|
}
|
|
|
|
const struct inode_operations ocfs2_file_iops = {
|
|
.setattr = ocfs2_setattr,
|
|
.getattr = ocfs2_getattr,
|
|
.permission = ocfs2_permission,
|
|
};
|
|
|
|
const struct inode_operations ocfs2_special_file_iops = {
|
|
.setattr = ocfs2_setattr,
|
|
.getattr = ocfs2_getattr,
|
|
.permission = ocfs2_permission,
|
|
};
|
|
|
|
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,
|
|
.ioctl = ocfs2_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = ocfs2_compat_ioctl,
|
|
#endif
|
|
.splice_read = ocfs2_file_splice_read,
|
|
.splice_write = ocfs2_file_splice_write,
|
|
};
|
|
|
|
const struct file_operations ocfs2_dops = {
|
|
.read = generic_read_dir,
|
|
.readdir = ocfs2_readdir,
|
|
.fsync = ocfs2_sync_file,
|
|
.ioctl = ocfs2_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = ocfs2_compat_ioctl,
|
|
#endif
|
|
};
|