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62 |
marcus.erl |
/*
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* fs/cifs/file.c
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*
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* vfs operations that deal with files
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*
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* Copyright (C) International Business Machines Corp., 2002,2007
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* Author(s): Steve French (sfrench@us.ibm.com)
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* Jeremy Allison (jra@samba.org)
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This library 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
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* the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/fs.h>
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#include <linux/backing-dev.h>
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#include <linux/stat.h>
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#include <linux/fcntl.h>
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#include <linux/pagemap.h>
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#include <linux/pagevec.h>
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#include <linux/writeback.h>
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#include <linux/task_io_accounting_ops.h>
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#include <linux/delay.h>
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#include <asm/div64.h>
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#include "cifsfs.h"
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#include "cifspdu.h"
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#include "cifsglob.h"
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#include "cifsproto.h"
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#include "cifs_unicode.h"
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#include "cifs_debug.h"
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#include "cifs_fs_sb.h"
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static inline struct cifsFileInfo *cifs_init_private(
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struct cifsFileInfo *private_data, struct inode *inode,
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struct file *file, __u16 netfid)
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{
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memset(private_data, 0, sizeof(struct cifsFileInfo));
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private_data->netfid = netfid;
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private_data->pid = current->tgid;
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init_MUTEX(&private_data->fh_sem);
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mutex_init(&private_data->lock_mutex);
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INIT_LIST_HEAD(&private_data->llist);
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private_data->pfile = file; /* needed for writepage */
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private_data->pInode = inode;
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private_data->invalidHandle = FALSE;
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private_data->closePend = FALSE;
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/* we have to track num writers to the inode, since writepages
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does not tell us which handle the write is for so there can
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| 58 |
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be a close (overlapping with write) of the filehandle that
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| 59 |
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cifs_writepages chose to use */
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| 60 |
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atomic_set(&private_data->wrtPending, 0);
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| 61 |
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| 62 |
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return private_data;
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| 63 |
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}
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| 64 |
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| 65 |
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static inline int cifs_convert_flags(unsigned int flags)
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| 66 |
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{
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| 67 |
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if ((flags & O_ACCMODE) == O_RDONLY)
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| 68 |
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return GENERIC_READ;
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| 69 |
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else if ((flags & O_ACCMODE) == O_WRONLY)
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| 70 |
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return GENERIC_WRITE;
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else if ((flags & O_ACCMODE) == O_RDWR) {
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/* GENERIC_ALL is too much permission to request
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can cause unnecessary access denied on create */
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| 74 |
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/* return GENERIC_ALL; */
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| 75 |
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return (GENERIC_READ | GENERIC_WRITE);
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| 76 |
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}
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| 77 |
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| 78 |
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return 0x20197;
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| 79 |
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}
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| 80 |
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| 81 |
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static inline int cifs_get_disposition(unsigned int flags)
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{
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| 83 |
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if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
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| 84 |
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return FILE_CREATE;
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| 85 |
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else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
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return FILE_OVERWRITE_IF;
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else if ((flags & O_CREAT) == O_CREAT)
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| 88 |
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return FILE_OPEN_IF;
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| 89 |
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else if ((flags & O_TRUNC) == O_TRUNC)
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| 90 |
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return FILE_OVERWRITE;
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| 91 |
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else
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| 92 |
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return FILE_OPEN;
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| 93 |
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}
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| 94 |
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| 95 |
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/* all arguments to this function must be checked for validity in caller */
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static inline int cifs_open_inode_helper(struct inode *inode, struct file *file,
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struct cifsInodeInfo *pCifsInode, struct cifsFileInfo *pCifsFile,
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struct cifsTconInfo *pTcon, int *oplock, FILE_ALL_INFO *buf,
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| 99 |
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char *full_path, int xid)
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{
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| 101 |
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struct timespec temp;
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| 102 |
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int rc;
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| 103 |
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| 104 |
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/* want handles we can use to read with first
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in the list so we do not have to walk the
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list to search for one in prepare_write */
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| 107 |
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if ((file->f_flags & O_ACCMODE) == O_WRONLY) {
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list_add_tail(&pCifsFile->flist,
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&pCifsInode->openFileList);
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| 110 |
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} else {
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| 111 |
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list_add(&pCifsFile->flist,
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&pCifsInode->openFileList);
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}
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write_unlock(&GlobalSMBSeslock);
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if (pCifsInode->clientCanCacheRead) {
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/* we have the inode open somewhere else
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no need to discard cache data */
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goto client_can_cache;
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| 119 |
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}
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| 120 |
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| 121 |
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/* BB need same check in cifs_create too? */
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/* if not oplocked, invalidate inode pages if mtime or file
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size changed */
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temp = cifs_NTtimeToUnix(le64_to_cpu(buf->LastWriteTime));
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if (timespec_equal(&file->f_path.dentry->d_inode->i_mtime, &temp) &&
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(file->f_path.dentry->d_inode->i_size ==
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(loff_t)le64_to_cpu(buf->EndOfFile))) {
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cFYI(1, ("inode unchanged on server"));
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} else {
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if (file->f_path.dentry->d_inode->i_mapping) {
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/* BB no need to lock inode until after invalidate
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since namei code should already have it locked? */
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rc = filemap_write_and_wait(file->f_path.dentry->d_inode->i_mapping);
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if (rc != 0)
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CIFS_I(file->f_path.dentry->d_inode)->write_behind_rc = rc;
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}
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cFYI(1, ("invalidating remote inode since open detected it "
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"changed"));
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invalidate_remote_inode(file->f_path.dentry->d_inode);
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| 140 |
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}
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| 142 |
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client_can_cache:
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if (pTcon->unix_ext)
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rc = cifs_get_inode_info_unix(&file->f_path.dentry->d_inode,
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full_path, inode->i_sb, xid);
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else
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rc = cifs_get_inode_info(&file->f_path.dentry->d_inode,
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full_path, buf, inode->i_sb, xid);
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| 150 |
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if ((*oplock & 0xF) == OPLOCK_EXCLUSIVE) {
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pCifsInode->clientCanCacheAll = TRUE;
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pCifsInode->clientCanCacheRead = TRUE;
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cFYI(1, ("Exclusive Oplock granted on inode %p",
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file->f_path.dentry->d_inode));
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} else if ((*oplock & 0xF) == OPLOCK_READ)
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pCifsInode->clientCanCacheRead = TRUE;
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| 158 |
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return rc;
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| 159 |
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}
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| 160 |
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| 161 |
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int cifs_open(struct inode *inode, struct file *file)
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| 162 |
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{
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| 163 |
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int rc = -EACCES;
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| 164 |
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int xid, oplock;
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| 165 |
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struct cifs_sb_info *cifs_sb;
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| 166 |
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struct cifsTconInfo *pTcon;
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| 167 |
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struct cifsFileInfo *pCifsFile;
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| 168 |
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struct cifsInodeInfo *pCifsInode;
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| 169 |
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struct list_head *tmp;
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| 170 |
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char *full_path = NULL;
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| 171 |
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int desiredAccess;
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| 172 |
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int disposition;
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| 173 |
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__u16 netfid;
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| 174 |
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FILE_ALL_INFO *buf = NULL;
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| 175 |
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| 176 |
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xid = GetXid();
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| 177 |
|
|
|
| 178 |
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cifs_sb = CIFS_SB(inode->i_sb);
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| 179 |
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pTcon = cifs_sb->tcon;
|
| 180 |
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|
|
| 181 |
|
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if (file->f_flags & O_CREAT) {
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| 182 |
|
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/* search inode for this file and fill in file->private_data */
|
| 183 |
|
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pCifsInode = CIFS_I(file->f_path.dentry->d_inode);
|
| 184 |
|
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read_lock(&GlobalSMBSeslock);
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| 185 |
|
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list_for_each(tmp, &pCifsInode->openFileList) {
|
| 186 |
|
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pCifsFile = list_entry(tmp, struct cifsFileInfo,
|
| 187 |
|
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flist);
|
| 188 |
|
|
if ((pCifsFile->pfile == NULL) &&
|
| 189 |
|
|
(pCifsFile->pid == current->tgid)) {
|
| 190 |
|
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/* mode set in cifs_create */
|
| 191 |
|
|
|
| 192 |
|
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/* needed for writepage */
|
| 193 |
|
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pCifsFile->pfile = file;
|
| 194 |
|
|
|
| 195 |
|
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file->private_data = pCifsFile;
|
| 196 |
|
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break;
|
| 197 |
|
|
}
|
| 198 |
|
|
}
|
| 199 |
|
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read_unlock(&GlobalSMBSeslock);
|
| 200 |
|
|
if (file->private_data != NULL) {
|
| 201 |
|
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rc = 0;
|
| 202 |
|
|
FreeXid(xid);
|
| 203 |
|
|
return rc;
|
| 204 |
|
|
} else {
|
| 205 |
|
|
if (file->f_flags & O_EXCL)
|
| 206 |
|
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cERROR(1, ("could not find file instance for "
|
| 207 |
|
|
"new file %p", file));
|
| 208 |
|
|
}
|
| 209 |
|
|
}
|
| 210 |
|
|
|
| 211 |
|
|
full_path = build_path_from_dentry(file->f_path.dentry);
|
| 212 |
|
|
if (full_path == NULL) {
|
| 213 |
|
|
FreeXid(xid);
|
| 214 |
|
|
return -ENOMEM;
|
| 215 |
|
|
}
|
| 216 |
|
|
|
| 217 |
|
|
cFYI(1, ("inode = 0x%p file flags are 0x%x for %s",
|
| 218 |
|
|
inode, file->f_flags, full_path));
|
| 219 |
|
|
desiredAccess = cifs_convert_flags(file->f_flags);
|
| 220 |
|
|
|
| 221 |
|
|
/*********************************************************************
|
| 222 |
|
|
* open flag mapping table:
|
| 223 |
|
|
*
|
| 224 |
|
|
* POSIX Flag CIFS Disposition
|
| 225 |
|
|
* ---------- ----------------
|
| 226 |
|
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* O_CREAT FILE_OPEN_IF
|
| 227 |
|
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* O_CREAT | O_EXCL FILE_CREATE
|
| 228 |
|
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* O_CREAT | O_TRUNC FILE_OVERWRITE_IF
|
| 229 |
|
|
* O_TRUNC FILE_OVERWRITE
|
| 230 |
|
|
* none of the above FILE_OPEN
|
| 231 |
|
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*
|
| 232 |
|
|
* Note that there is not a direct match between disposition
|
| 233 |
|
|
* FILE_SUPERSEDE (ie create whether or not file exists although
|
| 234 |
|
|
* O_CREAT | O_TRUNC is similar but truncates the existing
|
| 235 |
|
|
* file rather than creating a new file as FILE_SUPERSEDE does
|
| 236 |
|
|
* (which uses the attributes / metadata passed in on open call)
|
| 237 |
|
|
*?
|
| 238 |
|
|
*? O_SYNC is a reasonable match to CIFS writethrough flag
|
| 239 |
|
|
*? and the read write flags match reasonably. O_LARGEFILE
|
| 240 |
|
|
*? is irrelevant because largefile support is always used
|
| 241 |
|
|
*? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY,
|
| 242 |
|
|
* O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation
|
| 243 |
|
|
*********************************************************************/
|
| 244 |
|
|
|
| 245 |
|
|
disposition = cifs_get_disposition(file->f_flags);
|
| 246 |
|
|
|
| 247 |
|
|
if (oplockEnabled)
|
| 248 |
|
|
oplock = REQ_OPLOCK;
|
| 249 |
|
|
else
|
| 250 |
|
|
oplock = FALSE;
|
| 251 |
|
|
|
| 252 |
|
|
/* BB pass O_SYNC flag through on file attributes .. BB */
|
| 253 |
|
|
|
| 254 |
|
|
/* Also refresh inode by passing in file_info buf returned by SMBOpen
|
| 255 |
|
|
and calling get_inode_info with returned buf (at least helps
|
| 256 |
|
|
non-Unix server case) */
|
| 257 |
|
|
|
| 258 |
|
|
/* BB we can not do this if this is the second open of a file
|
| 259 |
|
|
and the first handle has writebehind data, we might be
|
| 260 |
|
|
able to simply do a filemap_fdatawrite/filemap_fdatawait first */
|
| 261 |
|
|
buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
|
| 262 |
|
|
if (!buf) {
|
| 263 |
|
|
rc = -ENOMEM;
|
| 264 |
|
|
goto out;
|
| 265 |
|
|
}
|
| 266 |
|
|
|
| 267 |
|
|
if (cifs_sb->tcon->ses->capabilities & CAP_NT_SMBS)
|
| 268 |
|
|
rc = CIFSSMBOpen(xid, pTcon, full_path, disposition,
|
| 269 |
|
|
desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf,
|
| 270 |
|
|
cifs_sb->local_nls, cifs_sb->mnt_cifs_flags
|
| 271 |
|
|
& CIFS_MOUNT_MAP_SPECIAL_CHR);
|
| 272 |
|
|
else
|
| 273 |
|
|
rc = -EIO; /* no NT SMB support fall into legacy open below */
|
| 274 |
|
|
|
| 275 |
|
|
if (rc == -EIO) {
|
| 276 |
|
|
/* Old server, try legacy style OpenX */
|
| 277 |
|
|
rc = SMBLegacyOpen(xid, pTcon, full_path, disposition,
|
| 278 |
|
|
desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf,
|
| 279 |
|
|
cifs_sb->local_nls, cifs_sb->mnt_cifs_flags
|
| 280 |
|
|
& CIFS_MOUNT_MAP_SPECIAL_CHR);
|
| 281 |
|
|
}
|
| 282 |
|
|
if (rc) {
|
| 283 |
|
|
cFYI(1, ("cifs_open returned 0x%x", rc));
|
| 284 |
|
|
goto out;
|
| 285 |
|
|
}
|
| 286 |
|
|
file->private_data =
|
| 287 |
|
|
kmalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
|
| 288 |
|
|
if (file->private_data == NULL) {
|
| 289 |
|
|
rc = -ENOMEM;
|
| 290 |
|
|
goto out;
|
| 291 |
|
|
}
|
| 292 |
|
|
pCifsFile = cifs_init_private(file->private_data, inode, file, netfid);
|
| 293 |
|
|
write_lock(&GlobalSMBSeslock);
|
| 294 |
|
|
list_add(&pCifsFile->tlist, &pTcon->openFileList);
|
| 295 |
|
|
|
| 296 |
|
|
pCifsInode = CIFS_I(file->f_path.dentry->d_inode);
|
| 297 |
|
|
if (pCifsInode) {
|
| 298 |
|
|
rc = cifs_open_inode_helper(inode, file, pCifsInode,
|
| 299 |
|
|
pCifsFile, pTcon,
|
| 300 |
|
|
&oplock, buf, full_path, xid);
|
| 301 |
|
|
} else {
|
| 302 |
|
|
write_unlock(&GlobalSMBSeslock);
|
| 303 |
|
|
}
|
| 304 |
|
|
|
| 305 |
|
|
if (oplock & CIFS_CREATE_ACTION) {
|
| 306 |
|
|
/* time to set mode which we can not set earlier due to
|
| 307 |
|
|
problems creating new read-only files */
|
| 308 |
|
|
if (pTcon->unix_ext) {
|
| 309 |
|
|
CIFSSMBUnixSetPerms(xid, pTcon, full_path,
|
| 310 |
|
|
inode->i_mode,
|
| 311 |
|
|
(__u64)-1, (__u64)-1, 0 /* dev */,
|
| 312 |
|
|
cifs_sb->local_nls,
|
| 313 |
|
|
cifs_sb->mnt_cifs_flags &
|
| 314 |
|
|
CIFS_MOUNT_MAP_SPECIAL_CHR);
|
| 315 |
|
|
} else {
|
| 316 |
|
|
/* BB implement via Windows security descriptors eg
|
| 317 |
|
|
CIFSSMBWinSetPerms(xid, pTcon, full_path, mode,
|
| 318 |
|
|
-1, -1, local_nls);
|
| 319 |
|
|
in the meantime could set r/o dos attribute when
|
| 320 |
|
|
perms are eg: mode & 0222 == 0 */
|
| 321 |
|
|
}
|
| 322 |
|
|
}
|
| 323 |
|
|
|
| 324 |
|
|
out:
|
| 325 |
|
|
kfree(buf);
|
| 326 |
|
|
kfree(full_path);
|
| 327 |
|
|
FreeXid(xid);
|
| 328 |
|
|
return rc;
|
| 329 |
|
|
}
|
| 330 |
|
|
|
| 331 |
|
|
/* Try to reacquire byte range locks that were released when session */
|
| 332 |
|
|
/* to server was lost */
|
| 333 |
|
|
static int cifs_relock_file(struct cifsFileInfo *cifsFile)
|
| 334 |
|
|
{
|
| 335 |
|
|
int rc = 0;
|
| 336 |
|
|
|
| 337 |
|
|
/* BB list all locks open on this file and relock */
|
| 338 |
|
|
|
| 339 |
|
|
return rc;
|
| 340 |
|
|
}
|
| 341 |
|
|
|
| 342 |
|
|
static int cifs_reopen_file(struct file *file, int can_flush)
|
| 343 |
|
|
{
|
| 344 |
|
|
int rc = -EACCES;
|
| 345 |
|
|
int xid, oplock;
|
| 346 |
|
|
struct cifs_sb_info *cifs_sb;
|
| 347 |
|
|
struct cifsTconInfo *pTcon;
|
| 348 |
|
|
struct cifsFileInfo *pCifsFile;
|
| 349 |
|
|
struct cifsInodeInfo *pCifsInode;
|
| 350 |
|
|
struct inode *inode;
|
| 351 |
|
|
char *full_path = NULL;
|
| 352 |
|
|
int desiredAccess;
|
| 353 |
|
|
int disposition = FILE_OPEN;
|
| 354 |
|
|
__u16 netfid;
|
| 355 |
|
|
|
| 356 |
|
|
if (file->private_data) {
|
| 357 |
|
|
pCifsFile = (struct cifsFileInfo *)file->private_data;
|
| 358 |
|
|
} else
|
| 359 |
|
|
return -EBADF;
|
| 360 |
|
|
|
| 361 |
|
|
xid = GetXid();
|
| 362 |
|
|
down(&pCifsFile->fh_sem);
|
| 363 |
|
|
if (pCifsFile->invalidHandle == FALSE) {
|
| 364 |
|
|
up(&pCifsFile->fh_sem);
|
| 365 |
|
|
FreeXid(xid);
|
| 366 |
|
|
return 0;
|
| 367 |
|
|
}
|
| 368 |
|
|
|
| 369 |
|
|
if (file->f_path.dentry == NULL) {
|
| 370 |
|
|
cERROR(1, ("no valid name if dentry freed"));
|
| 371 |
|
|
dump_stack();
|
| 372 |
|
|
rc = -EBADF;
|
| 373 |
|
|
goto reopen_error_exit;
|
| 374 |
|
|
}
|
| 375 |
|
|
|
| 376 |
|
|
inode = file->f_path.dentry->d_inode;
|
| 377 |
|
|
if (inode == NULL) {
|
| 378 |
|
|
cERROR(1, ("inode not valid"));
|
| 379 |
|
|
dump_stack();
|
| 380 |
|
|
rc = -EBADF;
|
| 381 |
|
|
goto reopen_error_exit;
|
| 382 |
|
|
}
|
| 383 |
|
|
|
| 384 |
|
|
cifs_sb = CIFS_SB(inode->i_sb);
|
| 385 |
|
|
pTcon = cifs_sb->tcon;
|
| 386 |
|
|
|
| 387 |
|
|
/* can not grab rename sem here because various ops, including
|
| 388 |
|
|
those that already have the rename sem can end up causing writepage
|
| 389 |
|
|
to get called and if the server was down that means we end up here,
|
| 390 |
|
|
and we can never tell if the caller already has the rename_sem */
|
| 391 |
|
|
full_path = build_path_from_dentry(file->f_path.dentry);
|
| 392 |
|
|
if (full_path == NULL) {
|
| 393 |
|
|
rc = -ENOMEM;
|
| 394 |
|
|
reopen_error_exit:
|
| 395 |
|
|
up(&pCifsFile->fh_sem);
|
| 396 |
|
|
FreeXid(xid);
|
| 397 |
|
|
return rc;
|
| 398 |
|
|
}
|
| 399 |
|
|
|
| 400 |
|
|
cFYI(1, ("inode = 0x%p file flags 0x%x for %s",
|
| 401 |
|
|
inode, file->f_flags, full_path));
|
| 402 |
|
|
desiredAccess = cifs_convert_flags(file->f_flags);
|
| 403 |
|
|
|
| 404 |
|
|
if (oplockEnabled)
|
| 405 |
|
|
oplock = REQ_OPLOCK;
|
| 406 |
|
|
else
|
| 407 |
|
|
oplock = FALSE;
|
| 408 |
|
|
|
| 409 |
|
|
/* Can not refresh inode by passing in file_info buf to be returned
|
| 410 |
|
|
by SMBOpen and then calling get_inode_info with returned buf
|
| 411 |
|
|
since file might have write behind data that needs to be flushed
|
| 412 |
|
|
and server version of file size can be stale. If we knew for sure
|
| 413 |
|
|
that inode was not dirty locally we could do this */
|
| 414 |
|
|
|
| 415 |
|
|
rc = CIFSSMBOpen(xid, pTcon, full_path, disposition, desiredAccess,
|
| 416 |
|
|
CREATE_NOT_DIR, &netfid, &oplock, NULL,
|
| 417 |
|
|
cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
|
| 418 |
|
|
CIFS_MOUNT_MAP_SPECIAL_CHR);
|
| 419 |
|
|
if (rc) {
|
| 420 |
|
|
up(&pCifsFile->fh_sem);
|
| 421 |
|
|
cFYI(1, ("cifs_open returned 0x%x", rc));
|
| 422 |
|
|
cFYI(1, ("oplock: %d", oplock));
|
| 423 |
|
|
} else {
|
| 424 |
|
|
pCifsFile->netfid = netfid;
|
| 425 |
|
|
pCifsFile->invalidHandle = FALSE;
|
| 426 |
|
|
up(&pCifsFile->fh_sem);
|
| 427 |
|
|
pCifsInode = CIFS_I(inode);
|
| 428 |
|
|
if (pCifsInode) {
|
| 429 |
|
|
if (can_flush) {
|
| 430 |
|
|
rc = filemap_write_and_wait(inode->i_mapping);
|
| 431 |
|
|
if (rc != 0)
|
| 432 |
|
|
CIFS_I(inode)->write_behind_rc = rc;
|
| 433 |
|
|
/* temporarily disable caching while we
|
| 434 |
|
|
go to server to get inode info */
|
| 435 |
|
|
pCifsInode->clientCanCacheAll = FALSE;
|
| 436 |
|
|
pCifsInode->clientCanCacheRead = FALSE;
|
| 437 |
|
|
if (pTcon->unix_ext)
|
| 438 |
|
|
rc = cifs_get_inode_info_unix(&inode,
|
| 439 |
|
|
full_path, inode->i_sb, xid);
|
| 440 |
|
|
else
|
| 441 |
|
|
rc = cifs_get_inode_info(&inode,
|
| 442 |
|
|
full_path, NULL, inode->i_sb,
|
| 443 |
|
|
xid);
|
| 444 |
|
|
} /* else we are writing out data to server already
|
| 445 |
|
|
and could deadlock if we tried to flush data, and
|
| 446 |
|
|
since we do not know if we have data that would
|
| 447 |
|
|
invalidate the current end of file on the server
|
| 448 |
|
|
we can not go to the server to get the new inod
|
| 449 |
|
|
info */
|
| 450 |
|
|
if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) {
|
| 451 |
|
|
pCifsInode->clientCanCacheAll = TRUE;
|
| 452 |
|
|
pCifsInode->clientCanCacheRead = TRUE;
|
| 453 |
|
|
cFYI(1, ("Exclusive Oplock granted on inode %p",
|
| 454 |
|
|
file->f_path.dentry->d_inode));
|
| 455 |
|
|
} else if ((oplock & 0xF) == OPLOCK_READ) {
|
| 456 |
|
|
pCifsInode->clientCanCacheRead = TRUE;
|
| 457 |
|
|
pCifsInode->clientCanCacheAll = FALSE;
|
| 458 |
|
|
} else {
|
| 459 |
|
|
pCifsInode->clientCanCacheRead = FALSE;
|
| 460 |
|
|
pCifsInode->clientCanCacheAll = FALSE;
|
| 461 |
|
|
}
|
| 462 |
|
|
cifs_relock_file(pCifsFile);
|
| 463 |
|
|
}
|
| 464 |
|
|
}
|
| 465 |
|
|
|
| 466 |
|
|
kfree(full_path);
|
| 467 |
|
|
FreeXid(xid);
|
| 468 |
|
|
return rc;
|
| 469 |
|
|
}
|
| 470 |
|
|
|
| 471 |
|
|
int cifs_close(struct inode *inode, struct file *file)
|
| 472 |
|
|
{
|
| 473 |
|
|
int rc = 0;
|
| 474 |
|
|
int xid, timeout;
|
| 475 |
|
|
struct cifs_sb_info *cifs_sb;
|
| 476 |
|
|
struct cifsTconInfo *pTcon;
|
| 477 |
|
|
struct cifsFileInfo *pSMBFile =
|
| 478 |
|
|
(struct cifsFileInfo *)file->private_data;
|
| 479 |
|
|
|
| 480 |
|
|
xid = GetXid();
|
| 481 |
|
|
|
| 482 |
|
|
cifs_sb = CIFS_SB(inode->i_sb);
|
| 483 |
|
|
pTcon = cifs_sb->tcon;
|
| 484 |
|
|
if (pSMBFile) {
|
| 485 |
|
|
struct cifsLockInfo *li, *tmp;
|
| 486 |
|
|
|
| 487 |
|
|
pSMBFile->closePend = TRUE;
|
| 488 |
|
|
if (pTcon) {
|
| 489 |
|
|
/* no sense reconnecting to close a file that is
|
| 490 |
|
|
already closed */
|
| 491 |
|
|
if (pTcon->tidStatus != CifsNeedReconnect) {
|
| 492 |
|
|
timeout = 2;
|
| 493 |
|
|
while ((atomic_read(&pSMBFile->wrtPending) != 0)
|
| 494 |
|
|
&& (timeout <= 2048)) {
|
| 495 |
|
|
/* Give write a better chance to get to
|
| 496 |
|
|
server ahead of the close. We do not
|
| 497 |
|
|
want to add a wait_q here as it would
|
| 498 |
|
|
increase the memory utilization as
|
| 499 |
|
|
the struct would be in each open file,
|
| 500 |
|
|
but this should give enough time to
|
| 501 |
|
|
clear the socket */
|
| 502 |
|
|
#ifdef CONFIG_CIFS_DEBUG2
|
| 503 |
|
|
cFYI(1, ("close delay, write pending"));
|
| 504 |
|
|
#endif /* DEBUG2 */
|
| 505 |
|
|
msleep(timeout);
|
| 506 |
|
|
timeout *= 4;
|
| 507 |
|
|
}
|
| 508 |
|
|
if (atomic_read(&pSMBFile->wrtPending))
|
| 509 |
|
|
cERROR(1,
|
| 510 |
|
|
("close with pending writes"));
|
| 511 |
|
|
rc = CIFSSMBClose(xid, pTcon,
|
| 512 |
|
|
pSMBFile->netfid);
|
| 513 |
|
|
}
|
| 514 |
|
|
}
|
| 515 |
|
|
|
| 516 |
|
|
/* Delete any outstanding lock records.
|
| 517 |
|
|
We'll lose them when the file is closed anyway. */
|
| 518 |
|
|
mutex_lock(&pSMBFile->lock_mutex);
|
| 519 |
|
|
list_for_each_entry_safe(li, tmp, &pSMBFile->llist, llist) {
|
| 520 |
|
|
list_del(&li->llist);
|
| 521 |
|
|
kfree(li);
|
| 522 |
|
|
}
|
| 523 |
|
|
mutex_unlock(&pSMBFile->lock_mutex);
|
| 524 |
|
|
|
| 525 |
|
|
write_lock(&GlobalSMBSeslock);
|
| 526 |
|
|
list_del(&pSMBFile->flist);
|
| 527 |
|
|
list_del(&pSMBFile->tlist);
|
| 528 |
|
|
write_unlock(&GlobalSMBSeslock);
|
| 529 |
|
|
timeout = 10;
|
| 530 |
|
|
/* We waited above to give the SMBWrite a chance to issue
|
| 531 |
|
|
on the wire (so we do not get SMBWrite returning EBADF
|
| 532 |
|
|
if writepages is racing with close. Note that writepages
|
| 533 |
|
|
does not specify a file handle, so it is possible for a file
|
| 534 |
|
|
to be opened twice, and the application close the "wrong"
|
| 535 |
|
|
file handle - in these cases we delay long enough to allow
|
| 536 |
|
|
the SMBWrite to get on the wire before the SMB Close.
|
| 537 |
|
|
We allow total wait here over 45 seconds, more than
|
| 538 |
|
|
oplock break time, and more than enough to allow any write
|
| 539 |
|
|
to complete on the server, or to time out on the client */
|
| 540 |
|
|
while ((atomic_read(&pSMBFile->wrtPending) != 0)
|
| 541 |
|
|
&& (timeout <= 50000)) {
|
| 542 |
|
|
cERROR(1, ("writes pending, delay free of handle"));
|
| 543 |
|
|
msleep(timeout);
|
| 544 |
|
|
timeout *= 8;
|
| 545 |
|
|
}
|
| 546 |
|
|
kfree(pSMBFile->search_resume_name);
|
| 547 |
|
|
kfree(file->private_data);
|
| 548 |
|
|
file->private_data = NULL;
|
| 549 |
|
|
} else
|
| 550 |
|
|
rc = -EBADF;
|
| 551 |
|
|
|
| 552 |
|
|
read_lock(&GlobalSMBSeslock);
|
| 553 |
|
|
if (list_empty(&(CIFS_I(inode)->openFileList))) {
|
| 554 |
|
|
cFYI(1, ("closing last open instance for inode %p", inode));
|
| 555 |
|
|
/* if the file is not open we do not know if we can cache info
|
| 556 |
|
|
on this inode, much less write behind and read ahead */
|
| 557 |
|
|
CIFS_I(inode)->clientCanCacheRead = FALSE;
|
| 558 |
|
|
CIFS_I(inode)->clientCanCacheAll = FALSE;
|
| 559 |
|
|
}
|
| 560 |
|
|
read_unlock(&GlobalSMBSeslock);
|
| 561 |
|
|
if ((rc == 0) && CIFS_I(inode)->write_behind_rc)
|
| 562 |
|
|
rc = CIFS_I(inode)->write_behind_rc;
|
| 563 |
|
|
FreeXid(xid);
|
| 564 |
|
|
return rc;
|
| 565 |
|
|
}
|
| 566 |
|
|
|
| 567 |
|
|
int cifs_closedir(struct inode *inode, struct file *file)
|
| 568 |
|
|
{
|
| 569 |
|
|
int rc = 0;
|
| 570 |
|
|
int xid;
|
| 571 |
|
|
struct cifsFileInfo *pCFileStruct =
|
| 572 |
|
|
(struct cifsFileInfo *)file->private_data;
|
| 573 |
|
|
char *ptmp;
|
| 574 |
|
|
|
| 575 |
|
|
cFYI(1, ("Closedir inode = 0x%p", inode));
|
| 576 |
|
|
|
| 577 |
|
|
xid = GetXid();
|
| 578 |
|
|
|
| 579 |
|
|
if (pCFileStruct) {
|
| 580 |
|
|
struct cifsTconInfo *pTcon;
|
| 581 |
|
|
struct cifs_sb_info *cifs_sb =
|
| 582 |
|
|
CIFS_SB(file->f_path.dentry->d_sb);
|
| 583 |
|
|
|
| 584 |
|
|
pTcon = cifs_sb->tcon;
|
| 585 |
|
|
|
| 586 |
|
|
cFYI(1, ("Freeing private data in close dir"));
|
| 587 |
|
|
if ((pCFileStruct->srch_inf.endOfSearch == FALSE) &&
|
| 588 |
|
|
(pCFileStruct->invalidHandle == FALSE)) {
|
| 589 |
|
|
pCFileStruct->invalidHandle = TRUE;
|
| 590 |
|
|
rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid);
|
| 591 |
|
|
cFYI(1, ("Closing uncompleted readdir with rc %d",
|
| 592 |
|
|
rc));
|
| 593 |
|
|
/* not much we can do if it fails anyway, ignore rc */
|
| 594 |
|
|
rc = 0;
|
| 595 |
|
|
}
|
| 596 |
|
|
ptmp = pCFileStruct->srch_inf.ntwrk_buf_start;
|
| 597 |
|
|
if (ptmp) {
|
| 598 |
|
|
cFYI(1, ("closedir free smb buf in srch struct"));
|
| 599 |
|
|
pCFileStruct->srch_inf.ntwrk_buf_start = NULL;
|
| 600 |
|
|
if (pCFileStruct->srch_inf.smallBuf)
|
| 601 |
|
|
cifs_small_buf_release(ptmp);
|
| 602 |
|
|
else
|
| 603 |
|
|
cifs_buf_release(ptmp);
|
| 604 |
|
|
}
|
| 605 |
|
|
ptmp = pCFileStruct->search_resume_name;
|
| 606 |
|
|
if (ptmp) {
|
| 607 |
|
|
cFYI(1, ("closedir free resume name"));
|
| 608 |
|
|
pCFileStruct->search_resume_name = NULL;
|
| 609 |
|
|
kfree(ptmp);
|
| 610 |
|
|
}
|
| 611 |
|
|
kfree(file->private_data);
|
| 612 |
|
|
file->private_data = NULL;
|
| 613 |
|
|
}
|
| 614 |
|
|
/* BB can we lock the filestruct while this is going on? */
|
| 615 |
|
|
FreeXid(xid);
|
| 616 |
|
|
return rc;
|
| 617 |
|
|
}
|
| 618 |
|
|
|
| 619 |
|
|
static int store_file_lock(struct cifsFileInfo *fid, __u64 len,
|
| 620 |
|
|
__u64 offset, __u8 lockType)
|
| 621 |
|
|
{
|
| 622 |
|
|
struct cifsLockInfo *li =
|
| 623 |
|
|
kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL);
|
| 624 |
|
|
if (li == NULL)
|
| 625 |
|
|
return -ENOMEM;
|
| 626 |
|
|
li->offset = offset;
|
| 627 |
|
|
li->length = len;
|
| 628 |
|
|
li->type = lockType;
|
| 629 |
|
|
mutex_lock(&fid->lock_mutex);
|
| 630 |
|
|
list_add(&li->llist, &fid->llist);
|
| 631 |
|
|
mutex_unlock(&fid->lock_mutex);
|
| 632 |
|
|
return 0;
|
| 633 |
|
|
}
|
| 634 |
|
|
|
| 635 |
|
|
int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock)
|
| 636 |
|
|
{
|
| 637 |
|
|
int rc, xid;
|
| 638 |
|
|
__u32 numLock = 0;
|
| 639 |
|
|
__u32 numUnlock = 0;
|
| 640 |
|
|
__u64 length;
|
| 641 |
|
|
int wait_flag = FALSE;
|
| 642 |
|
|
struct cifs_sb_info *cifs_sb;
|
| 643 |
|
|
struct cifsTconInfo *pTcon;
|
| 644 |
|
|
__u16 netfid;
|
| 645 |
|
|
__u8 lockType = LOCKING_ANDX_LARGE_FILES;
|
| 646 |
|
|
int posix_locking;
|
| 647 |
|
|
|
| 648 |
|
|
length = 1 + pfLock->fl_end - pfLock->fl_start;
|
| 649 |
|
|
rc = -EACCES;
|
| 650 |
|
|
xid = GetXid();
|
| 651 |
|
|
|
| 652 |
|
|
cFYI(1, ("Lock parm: 0x%x flockflags: "
|
| 653 |
|
|
"0x%x flocktype: 0x%x start: %lld end: %lld",
|
| 654 |
|
|
cmd, pfLock->fl_flags, pfLock->fl_type, pfLock->fl_start,
|
| 655 |
|
|
pfLock->fl_end));
|
| 656 |
|
|
|
| 657 |
|
|
if (pfLock->fl_flags & FL_POSIX)
|
| 658 |
|
|
cFYI(1, ("Posix"));
|
| 659 |
|
|
if (pfLock->fl_flags & FL_FLOCK)
|
| 660 |
|
|
cFYI(1, ("Flock"));
|
| 661 |
|
|
if (pfLock->fl_flags & FL_SLEEP) {
|
| 662 |
|
|
cFYI(1, ("Blocking lock"));
|
| 663 |
|
|
wait_flag = TRUE;
|
| 664 |
|
|
}
|
| 665 |
|
|
if (pfLock->fl_flags & FL_ACCESS)
|
| 666 |
|
|
cFYI(1, ("Process suspended by mandatory locking - "
|
| 667 |
|
|
"not implemented yet"));
|
| 668 |
|
|
if (pfLock->fl_flags & FL_LEASE)
|
| 669 |
|
|
cFYI(1, ("Lease on file - not implemented yet"));
|
| 670 |
|
|
if (pfLock->fl_flags &
|
| 671 |
|
|
(~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE)))
|
| 672 |
|
|
cFYI(1, ("Unknown lock flags 0x%x", pfLock->fl_flags));
|
| 673 |
|
|
|
| 674 |
|
|
if (pfLock->fl_type == F_WRLCK) {
|
| 675 |
|
|
cFYI(1, ("F_WRLCK "));
|
| 676 |
|
|
numLock = 1;
|
| 677 |
|
|
} else if (pfLock->fl_type == F_UNLCK) {
|
| 678 |
|
|
cFYI(1, ("F_UNLCK"));
|
| 679 |
|
|
numUnlock = 1;
|
| 680 |
|
|
/* Check if unlock includes more than
|
| 681 |
|
|
one lock range */
|
| 682 |
|
|
} else if (pfLock->fl_type == F_RDLCK) {
|
| 683 |
|
|
cFYI(1, ("F_RDLCK"));
|
| 684 |
|
|
lockType |= LOCKING_ANDX_SHARED_LOCK;
|
| 685 |
|
|
numLock = 1;
|
| 686 |
|
|
} else if (pfLock->fl_type == F_EXLCK) {
|
| 687 |
|
|
cFYI(1, ("F_EXLCK"));
|
| 688 |
|
|
numLock = 1;
|
| 689 |
|
|
} else if (pfLock->fl_type == F_SHLCK) {
|
| 690 |
|
|
cFYI(1, ("F_SHLCK"));
|
| 691 |
|
|
lockType |= LOCKING_ANDX_SHARED_LOCK;
|
| 692 |
|
|
numLock = 1;
|
| 693 |
|
|
} else
|
| 694 |
|
|
cFYI(1, ("Unknown type of lock"));
|
| 695 |
|
|
|
| 696 |
|
|
cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
|
| 697 |
|
|
pTcon = cifs_sb->tcon;
|
| 698 |
|
|
|
| 699 |
|
|
if (file->private_data == NULL) {
|
| 700 |
|
|
FreeXid(xid);
|
| 701 |
|
|
return -EBADF;
|
| 702 |
|
|
}
|
| 703 |
|
|
netfid = ((struct cifsFileInfo *)file->private_data)->netfid;
|
| 704 |
|
|
|
| 705 |
|
|
posix_locking = (cifs_sb->tcon->ses->capabilities & CAP_UNIX) &&
|
| 706 |
|
|
(CIFS_UNIX_FCNTL_CAP & le64_to_cpu(cifs_sb->tcon->fsUnixInfo.Capability));
|
| 707 |
|
|
|
| 708 |
|
|
/* BB add code here to normalize offset and length to
|
| 709 |
|
|
account for negative length which we can not accept over the
|
| 710 |
|
|
wire */
|
| 711 |
|
|
if (IS_GETLK(cmd)) {
|
| 712 |
|
|
if (posix_locking) {
|
| 713 |
|
|
int posix_lock_type;
|
| 714 |
|
|
if (lockType & LOCKING_ANDX_SHARED_LOCK)
|
| 715 |
|
|
posix_lock_type = CIFS_RDLCK;
|
| 716 |
|
|
else
|
| 717 |
|
|
posix_lock_type = CIFS_WRLCK;
|
| 718 |
|
|
rc = CIFSSMBPosixLock(xid, pTcon, netfid, 1 /* get */,
|
| 719 |
|
|
length, pfLock,
|
| 720 |
|
|
posix_lock_type, wait_flag);
|
| 721 |
|
|
FreeXid(xid);
|
| 722 |
|
|
return rc;
|
| 723 |
|
|
}
|
| 724 |
|
|
|
| 725 |
|
|
/* BB we could chain these into one lock request BB */
|
| 726 |
|
|
rc = CIFSSMBLock(xid, pTcon, netfid, length, pfLock->fl_start,
|
| 727 |
|
|
0, 1, lockType, 0 /* wait flag */ );
|
| 728 |
|
|
if (rc == 0) {
|
| 729 |
|
|
rc = CIFSSMBLock(xid, pTcon, netfid, length,
|
| 730 |
|
|
pfLock->fl_start, 1 /* numUnlock */ ,
|
| 731 |
|
|
|
| 732 |
|
|
|
| 733 |
|
|
pfLock->fl_type = F_UNLCK;
|
| 734 |
|
|
if (rc != 0)
|
| 735 |
|
|
cERROR(1, ("Error unlocking previously locked "
|
| 736 |
|
|
"range %d during test of lock", rc));
|
| 737 |
|
|
rc = 0;
|
| 738 |
|
|
|
| 739 |
|
|
} else {
|
| 740 |
|
|
/* if rc == ERR_SHARING_VIOLATION ? */
|
| 741 |
|
|
rc = 0; /* do not change lock type to unlock
|
| 742 |
|
|
since range in use */
|
| 743 |
|
|
}
|
| 744 |
|
|
|
| 745 |
|
|
FreeXid(xid);
|
| 746 |
|
|
return rc;
|
| 747 |
|
|
}
|
| 748 |
|
|
|
| 749 |
|
|
if (!numLock && !numUnlock) {
|
| 750 |
|
|
/* if no lock or unlock then nothing
|
| 751 |
|
|
to do since we do not know what it is */
|
| 752 |
|
|
FreeXid(xid);
|
| 753 |
|
|
return -EOPNOTSUPP;
|
| 754 |
|
|
}
|
| 755 |
|
|
|
| 756 |
|
|
if (posix_locking) {
|
| 757 |
|
|
int posix_lock_type;
|
| 758 |
|
|
if (lockType & LOCKING_ANDX_SHARED_LOCK)
|
| 759 |
|
|
posix_lock_type = CIFS_RDLCK;
|
| 760 |
|
|
else
|
| 761 |
|
|
posix_lock_type = CIFS_WRLCK;
|
| 762 |
|
|
|
| 763 |
|
|
if (numUnlock == 1)
|
| 764 |
|
|
posix_lock_type = CIFS_UNLCK;
|
| 765 |
|
|
|
| 766 |
|
|
rc = CIFSSMBPosixLock(xid, pTcon, netfid, 0 /* set */,
|
| 767 |
|
|
length, pfLock,
|
| 768 |
|
|
posix_lock_type, wait_flag);
|
| 769 |
|
|
} else {
|
| 770 |
|
|
struct cifsFileInfo *fid =
|
| 771 |
|
|
(struct cifsFileInfo *)file->private_data;
|
| 772 |
|
|
|
| 773 |
|
|
if (numLock) {
|
| 774 |
|
|
rc = CIFSSMBLock(xid, pTcon, netfid, length,
|
| 775 |
|
|
pfLock->fl_start,
|
| 776 |
|
|
0, numLock, lockType, wait_flag);
|
| 777 |
|
|
|
| 778 |
|
|
if (rc == 0) {
|
| 779 |
|
|
/* For Windows locks we must store them. */
|
| 780 |
|
|
rc = store_file_lock(fid, length,
|
| 781 |
|
|
pfLock->fl_start, lockType);
|
| 782 |
|
|
}
|
| 783 |
|
|
} else if (numUnlock) {
|
| 784 |
|
|
/* For each stored lock that this unlock overlaps
|
| 785 |
|
|
completely, unlock it. */
|
| 786 |
|
|
int stored_rc = 0;
|
| 787 |
|
|
struct cifsLockInfo *li, *tmp;
|
| 788 |
|
|
|
| 789 |
|
|
rc = 0;
|
| 790 |
|
|
mutex_lock(&fid->lock_mutex);
|
| 791 |
|
|
list_for_each_entry_safe(li, tmp, &fid->llist, llist) {
|
| 792 |
|
|
if (pfLock->fl_start <= li->offset &&
|
| 793 |
|
|
(pfLock->fl_start + length) >=
|
| 794 |
|
|
(li->offset + li->length)) {
|
| 795 |
|
|
stored_rc = CIFSSMBLock(xid, pTcon,
|
| 796 |
|
|
netfid,
|
| 797 |
|
|
li->length, li->offset,
|
| 798 |
|
|
1, 0, li->type, FALSE);
|
| 799 |
|
|
if (stored_rc)
|
| 800 |
|
|
rc = stored_rc;
|
| 801 |
|
|
|
| 802 |
|
|
list_del(&li->llist);
|
| 803 |
|
|
kfree(li);
|
| 804 |
|
|
}
|
| 805 |
|
|
}
|
| 806 |
|
|
mutex_unlock(&fid->lock_mutex);
|
| 807 |
|
|
}
|
| 808 |
|
|
}
|
| 809 |
|
|
|
| 810 |
|
|
if (pfLock->fl_flags & FL_POSIX)
|
| 811 |
|
|
posix_lock_file_wait(file, pfLock);
|
| 812 |
|
|
FreeXid(xid);
|
| 813 |
|
|
return rc;
|
| 814 |
|
|
}
|
| 815 |
|
|
|
| 816 |
|
|
ssize_t cifs_user_write(struct file *file, const char __user *write_data,
|
| 817 |
|
|
size_t write_size, loff_t *poffset)
|
| 818 |
|
|
{
|
| 819 |
|
|
int rc = 0;
|
| 820 |
|
|
unsigned int bytes_written = 0;
|
| 821 |
|
|
unsigned int total_written;
|
| 822 |
|
|
struct cifs_sb_info *cifs_sb;
|
| 823 |
|
|
struct cifsTconInfo *pTcon;
|
| 824 |
|
|
int xid, long_op;
|
| 825 |
|
|
struct cifsFileInfo *open_file;
|
| 826 |
|
|
|
| 827 |
|
|
cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
|
| 828 |
|
|
|
| 829 |
|
|
pTcon = cifs_sb->tcon;
|
| 830 |
|
|
|
| 831 |
|
|
/* cFYI(1,
|
| 832 |
|
|
(" write %d bytes to offset %lld of %s", write_size,
|
| 833 |
|
|
*poffset, file->f_path.dentry->d_name.name)); */
|
| 834 |
|
|
|
| 835 |
|
|
if (file->private_data == NULL)
|
| 836 |
|
|
return -EBADF;
|
| 837 |
|
|
open_file = (struct cifsFileInfo *) file->private_data;
|
| 838 |
|
|
|
| 839 |
|
|
xid = GetXid();
|
| 840 |
|
|
|
| 841 |
|
|
if (*poffset > file->f_path.dentry->d_inode->i_size)
|
| 842 |
|
|
long_op = CIFS_VLONG_OP; /* writes past EOF take long time */
|
| 843 |
|
|
else
|
| 844 |
|
|
long_op = CIFS_LONG_OP;
|
| 845 |
|
|
|
| 846 |
|
|
for (total_written = 0; write_size > total_written;
|
| 847 |
|
|
total_written += bytes_written) {
|
| 848 |
|
|
rc = -EAGAIN;
|
| 849 |
|
|
while (rc == -EAGAIN) {
|
| 850 |
|
|
if (file->private_data == NULL) {
|
| 851 |
|
|
/* file has been closed on us */
|
| 852 |
|
|
FreeXid(xid);
|
| 853 |
|
|
/* if we have gotten here we have written some data
|
| 854 |
|
|
and blocked, and the file has been freed on us while
|
| 855 |
|
|
we blocked so return what we managed to write */
|
| 856 |
|
|
return total_written;
|
| 857 |
|
|
}
|
| 858 |
|
|
if (open_file->closePend) {
|
| 859 |
|
|
FreeXid(xid);
|
| 860 |
|
|
if (total_written)
|
| 861 |
|
|
return total_written;
|
| 862 |
|
|
else
|
| 863 |
|
|
return -EBADF;
|
| 864 |
|
|
}
|
| 865 |
|
|
if (open_file->invalidHandle) {
|
| 866 |
|
|
/* we could deadlock if we called
|
| 867 |
|
|
filemap_fdatawait from here so tell
|
| 868 |
|
|
reopen_file not to flush data to server
|
| 869 |
|
|
now */
|
| 870 |
|
|
rc = cifs_reopen_file(file, FALSE);
|
| 871 |
|
|
if (rc != 0)
|
| 872 |
|
|
break;
|
| 873 |
|
|
}
|
| 874 |
|
|
|
| 875 |
|
|
rc = CIFSSMBWrite(xid, pTcon,
|
| 876 |
|
|
open_file->netfid,
|
| 877 |
|
|
min_t(const int, cifs_sb->wsize,
|
| 878 |
|
|
write_size - total_written),
|
| 879 |
|
|
*poffset, &bytes_written,
|
| 880 |
|
|
NULL, write_data + total_written, long_op);
|
| 881 |
|
|
}
|
| 882 |
|
|
if (rc || (bytes_written == 0)) {
|
| 883 |
|
|
if (total_written)
|
| 884 |
|
|
break;
|
| 885 |
|
|
else {
|
| 886 |
|
|
FreeXid(xid);
|
| 887 |
|
|
return rc;
|
| 888 |
|
|
}
|
| 889 |
|
|
} else
|
| 890 |
|
|
*poffset += bytes_written;
|
| 891 |
|
|
long_op = CIFS_STD_OP; /* subsequent writes fast -
|
| 892 |
|
|
15 seconds is plenty */
|
| 893 |
|
|
}
|
| 894 |
|
|
|
| 895 |
|
|
cifs_stats_bytes_written(pTcon, total_written);
|
| 896 |
|
|
|
| 897 |
|
|
/* since the write may have blocked check these pointers again */
|
| 898 |
|
|
if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) {
|
| 899 |
|
|
struct inode *inode = file->f_path.dentry->d_inode;
|
| 900 |
|
|
/* Do not update local mtime - server will set its actual value on write
|
| 901 |
|
|
* inode->i_ctime = inode->i_mtime =
|
| 902 |
|
|
* current_fs_time(inode->i_sb);*/
|
| 903 |
|
|
if (total_written > 0) {
|
| 904 |
|
|
spin_lock(&inode->i_lock);
|
| 905 |
|
|
if (*poffset > file->f_path.dentry->d_inode->i_size)
|
| 906 |
|
|
i_size_write(file->f_path.dentry->d_inode,
|
| 907 |
|
|
*poffset);
|
| 908 |
|
|
spin_unlock(&inode->i_lock);
|
| 909 |
|
|
}
|
| 910 |
|
|
mark_inode_dirty_sync(file->f_path.dentry->d_inode);
|
| 911 |
|
|
}
|
| 912 |
|
|
FreeXid(xid);
|
| 913 |
|
|
return total_written;
|
| 914 |
|
|
}
|
| 915 |
|
|
|
| 916 |
|
|
static ssize_t cifs_write(struct file *file, const char *write_data,
|
| 917 |
|
|
size_t write_size, loff_t *poffset)
|
| 918 |
|
|
{
|
| 919 |
|
|
int rc = 0;
|
| 920 |
|
|
unsigned int bytes_written = 0;
|
| 921 |
|
|
unsigned int total_written;
|
| 922 |
|
|
struct cifs_sb_info *cifs_sb;
|
| 923 |
|
|
struct cifsTconInfo *pTcon;
|
| 924 |
|
|
int xid, long_op;
|
| 925 |
|
|
struct cifsFileInfo *open_file;
|
| 926 |
|
|
|
| 927 |
|
|
cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
|
| 928 |
|
|
|
| 929 |
|
|
pTcon = cifs_sb->tcon;
|
| 930 |
|
|
|
| 931 |
|
|
cFYI(1, ("write %zd bytes to offset %lld of %s", write_size,
|
| 932 |
|
|
*poffset, file->f_path.dentry->d_name.name));
|
| 933 |
|
|
|
| 934 |
|
|
if (file->private_data == NULL)
|
| 935 |
|
|
return -EBADF;
|
| 936 |
|
|
open_file = (struct cifsFileInfo *)file->private_data;
|
| 937 |
|
|
|
| 938 |
|
|
xid = GetXid();
|
| 939 |
|
|
|
| 940 |
|
|
if (*poffset > file->f_path.dentry->d_inode->i_size)
|
| 941 |
|
|
long_op = CIFS_VLONG_OP; /* writes past EOF can be slow */
|
| 942 |
|
|
else
|
| 943 |
|
|
long_op = CIFS_LONG_OP;
|
| 944 |
|
|
|
| 945 |
|
|
for (total_written = 0; write_size > total_written;
|
| 946 |
|
|
total_written += bytes_written) {
|
| 947 |
|
|
rc = -EAGAIN;
|
| 948 |
|
|
while (rc == -EAGAIN) {
|
| 949 |
|
|
if (file->private_data == NULL) {
|
| 950 |
|
|
/* file has been closed on us */
|
| 951 |
|
|
FreeXid(xid);
|
| 952 |
|
|
/* if we have gotten here we have written some data
|
| 953 |
|
|
and blocked, and the file has been freed on us
|
| 954 |
|
|
while we blocked so return what we managed to
|
| 955 |
|
|
write */
|
| 956 |
|
|
return total_written;
|
| 957 |
|
|
}
|
| 958 |
|
|
if (open_file->closePend) {
|
| 959 |
|
|
FreeXid(xid);
|
| 960 |
|
|
if (total_written)
|
| 961 |
|
|
return total_written;
|
| 962 |
|
|
else
|
| 963 |
|
|
return -EBADF;
|
| 964 |
|
|
}
|
| 965 |
|
|
if (open_file->invalidHandle) {
|
| 966 |
|
|
/* we could deadlock if we called
|
| 967 |
|
|
filemap_fdatawait from here so tell
|
| 968 |
|
|
reopen_file not to flush data to
|
| 969 |
|
|
server now */
|
| 970 |
|
|
rc = cifs_reopen_file(file, FALSE);
|
| 971 |
|
|
if (rc != 0)
|
| 972 |
|
|
break;
|
| 973 |
|
|
}
|
| 974 |
|
|
if (experimEnabled || (pTcon->ses->server &&
|
| 975 |
|
|
((pTcon->ses->server->secMode &
|
| 976 |
|
|
(SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
|
| 977 |
|
|
== 0))) {
|
| 978 |
|
|
struct kvec iov[2];
|
| 979 |
|
|
unsigned int len;
|
| 980 |
|
|
|
| 981 |
|
|
len = min((size_t)cifs_sb->wsize,
|
| 982 |
|
|
write_size - total_written);
|
| 983 |
|
|
/* iov[0] is reserved for smb header */
|
| 984 |
|
|
iov[1].iov_base = (char *)write_data +
|
| 985 |
|
|
total_written;
|
| 986 |
|
|
iov[1].iov_len = len;
|
| 987 |
|
|
rc = CIFSSMBWrite2(xid, pTcon,
|
| 988 |
|
|
open_file->netfid, len,
|
| 989 |
|
|
*poffset, &bytes_written,
|
| 990 |
|
|
iov, 1, long_op);
|
| 991 |
|
|
} else
|
| 992 |
|
|
rc = CIFSSMBWrite(xid, pTcon,
|
| 993 |
|
|
open_file->netfid,
|
| 994 |
|
|
min_t(const int, cifs_sb->wsize,
|
| 995 |
|
|
write_size - total_written),
|
| 996 |
|
|
*poffset, &bytes_written,
|
| 997 |
|
|
write_data + total_written,
|
| 998 |
|
|
NULL, long_op);
|
| 999 |
|
|
}
|
| 1000 |
|
|
if (rc || (bytes_written == 0)) {
|
| 1001 |
|
|
if (total_written)
|
| 1002 |
|
|
break;
|
| 1003 |
|
|
else {
|
| 1004 |
|
|
FreeXid(xid);
|
| 1005 |
|
|
return rc;
|
| 1006 |
|
|
}
|
| 1007 |
|
|
} else
|
| 1008 |
|
|
*poffset += bytes_written;
|
| 1009 |
|
|
long_op = CIFS_STD_OP; /* subsequent writes fast -
|
| 1010 |
|
|
15 seconds is plenty */
|
| 1011 |
|
|
}
|
| 1012 |
|
|
|
| 1013 |
|
|
cifs_stats_bytes_written(pTcon, total_written);
|
| 1014 |
|
|
|
| 1015 |
|
|
/* since the write may have blocked check these pointers again */
|
| 1016 |
|
|
if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) {
|
| 1017 |
|
|
/*BB We could make this contingent on superblock ATIME flag too */
|
| 1018 |
|
|
/* file->f_path.dentry->d_inode->i_ctime =
|
| 1019 |
|
|
file->f_path.dentry->d_inode->i_mtime = CURRENT_TIME;*/
|
| 1020 |
|
|
if (total_written > 0) {
|
| 1021 |
|
|
spin_lock(&file->f_path.dentry->d_inode->i_lock);
|
| 1022 |
|
|
if (*poffset > file->f_path.dentry->d_inode->i_size)
|
| 1023 |
|
|
i_size_write(file->f_path.dentry->d_inode,
|
| 1024 |
|
|
*poffset);
|
| 1025 |
|
|
spin_unlock(&file->f_path.dentry->d_inode->i_lock);
|
| 1026 |
|
|
}
|
| 1027 |
|
|
mark_inode_dirty_sync(file->f_path.dentry->d_inode);
|
| 1028 |
|
|
}
|
| 1029 |
|
|
FreeXid(xid);
|
| 1030 |
|
|
return total_written;
|
| 1031 |
|
|
}
|
| 1032 |
|
|
|
| 1033 |
|
|
#ifdef CONFIG_CIFS_EXPERIMENTAL
|
| 1034 |
|
|
struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode)
|
| 1035 |
|
|
{
|
| 1036 |
|
|
struct cifsFileInfo *open_file = NULL;
|
| 1037 |
|
|
|
| 1038 |
|
|
read_lock(&GlobalSMBSeslock);
|
| 1039 |
|
|
/* we could simply get the first_list_entry since write-only entries
|
| 1040 |
|
|
are always at the end of the list but since the first entry might
|
| 1041 |
|
|
have a close pending, we go through the whole list */
|
| 1042 |
|
|
list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
|
| 1043 |
|
|
if (open_file->closePend)
|
| 1044 |
|
|
continue;
|
| 1045 |
|
|
if (open_file->pfile && ((open_file->pfile->f_flags & O_RDWR) ||
|
| 1046 |
|
|
(open_file->pfile->f_flags & O_RDONLY))) {
|
| 1047 |
|
|
if (!open_file->invalidHandle) {
|
| 1048 |
|
|
/* found a good file */
|
| 1049 |
|
|
/* lock it so it will not be closed on us */
|
| 1050 |
|
|
atomic_inc(&open_file->wrtPending);
|
| 1051 |
|
|
read_unlock(&GlobalSMBSeslock);
|
| 1052 |
|
|
return open_file;
|
| 1053 |
|
|
} /* else might as well continue, and look for
|
| 1054 |
|
|
another, or simply have the caller reopen it
|
| 1055 |
|
|
again rather than trying to fix this handle */
|
| 1056 |
|
|
} else /* write only file */
|
| 1057 |
|
|
break; /* write only files are last so must be done */
|
| 1058 |
|
|
}
|
| 1059 |
|
|
read_unlock(&GlobalSMBSeslock);
|
| 1060 |
|
|
return NULL;
|
| 1061 |
|
|
}
|
| 1062 |
|
|
#endif
|
| 1063 |
|
|
|
| 1064 |
|
|
struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode)
|
| 1065 |
|
|
{
|
| 1066 |
|
|
struct cifsFileInfo *open_file;
|
| 1067 |
|
|
int rc;
|
| 1068 |
|
|
|
| 1069 |
|
|
/* Having a null inode here (because mapping->host was set to zero by
|
| 1070 |
|
|
the VFS or MM) should not happen but we had reports of on oops (due to
|
| 1071 |
|
|
it being zero) during stress testcases so we need to check for it */
|
| 1072 |
|
|
|
| 1073 |
|
|
if (cifs_inode == NULL) {
|
| 1074 |
|
|
cERROR(1, ("Null inode passed to cifs_writeable_file"));
|
| 1075 |
|
|
dump_stack();
|
| 1076 |
|
|
return NULL;
|
| 1077 |
|
|
}
|
| 1078 |
|
|
|
| 1079 |
|
|
read_lock(&GlobalSMBSeslock);
|
| 1080 |
|
|
refind_writable:
|
| 1081 |
|
|
list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
|
| 1082 |
|
|
if (open_file->closePend)
|
| 1083 |
|
|
continue;
|
| 1084 |
|
|
if (open_file->pfile &&
|
| 1085 |
|
|
((open_file->pfile->f_flags & O_RDWR) ||
|
| 1086 |
|
|
(open_file->pfile->f_flags & O_WRONLY))) {
|
| 1087 |
|
|
atomic_inc(&open_file->wrtPending);
|
| 1088 |
|
|
|
| 1089 |
|
|
if (!open_file->invalidHandle) {
|
| 1090 |
|
|
/* found a good writable file */
|
| 1091 |
|
|
read_unlock(&GlobalSMBSeslock);
|
| 1092 |
|
|
return open_file;
|
| 1093 |
|
|
}
|
| 1094 |
|
|
|
| 1095 |
|
|
read_unlock(&GlobalSMBSeslock);
|
| 1096 |
|
|
/* Had to unlock since following call can block */
|
| 1097 |
|
|
rc = cifs_reopen_file(open_file->pfile, FALSE);
|
| 1098 |
|
|
if (!rc) {
|
| 1099 |
|
|
if (!open_file->closePend)
|
| 1100 |
|
|
return open_file;
|
| 1101 |
|
|
else { /* start over in case this was deleted */
|
| 1102 |
|
|
/* since the list could be modified */
|
| 1103 |
|
|
read_lock(&GlobalSMBSeslock);
|
| 1104 |
|
|
atomic_dec(&open_file->wrtPending);
|
| 1105 |
|
|
goto refind_writable;
|
| 1106 |
|
|
}
|
| 1107 |
|
|
}
|
| 1108 |
|
|
|
| 1109 |
|
|
/* if it fails, try another handle if possible -
|
| 1110 |
|
|
(we can not do this if closePending since
|
| 1111 |
|
|
loop could be modified - in which case we
|
| 1112 |
|
|
have to start at the beginning of the list
|
| 1113 |
|
|
again. Note that it would be bad
|
| 1114 |
|
|
to hold up writepages here (rather than
|
| 1115 |
|
|
in caller) with continuous retries */
|
| 1116 |
|
|
cFYI(1, ("wp failed on reopen file"));
|
| 1117 |
|
|
read_lock(&GlobalSMBSeslock);
|
| 1118 |
|
|
/* can not use this handle, no write
|
| 1119 |
|
|
pending on this one after all */
|
| 1120 |
|
|
atomic_dec(&open_file->wrtPending);
|
| 1121 |
|
|
|
| 1122 |
|
|
if (open_file->closePend) /* list could have changed */
|
| 1123 |
|
|
goto refind_writable;
|
| 1124 |
|
|
/* else we simply continue to the next entry. Thus
|
| 1125 |
|
|
we do not loop on reopen errors. If we
|
| 1126 |
|
|
can not reopen the file, for example if we
|
| 1127 |
|
|
reconnected to a server with another client
|
| 1128 |
|
|
racing to delete or lock the file we would not
|
| 1129 |
|
|
make progress if we restarted before the beginning
|
| 1130 |
|
|
of the loop here. */
|
| 1131 |
|
|
}
|
| 1132 |
|
|
}
|
| 1133 |
|
|
read_unlock(&GlobalSMBSeslock);
|
| 1134 |
|
|
return NULL;
|
| 1135 |
|
|
}
|
| 1136 |
|
|
|
| 1137 |
|
|
static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to)
|
| 1138 |
|
|
{
|
| 1139 |
|
|
struct address_space *mapping = page->mapping;
|
| 1140 |
|
|
loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
|
| 1141 |
|
|
char *write_data;
|
| 1142 |
|
|
int rc = -EFAULT;
|
| 1143 |
|
|
int bytes_written = 0;
|
| 1144 |
|
|
struct cifs_sb_info *cifs_sb;
|
| 1145 |
|
|
struct cifsTconInfo *pTcon;
|
| 1146 |
|
|
struct inode *inode;
|
| 1147 |
|
|
struct cifsFileInfo *open_file;
|
| 1148 |
|
|
|
| 1149 |
|
|
if (!mapping || !mapping->host)
|
| 1150 |
|
|
return -EFAULT;
|
| 1151 |
|
|
|
| 1152 |
|
|
inode = page->mapping->host;
|
| 1153 |
|
|
cifs_sb = CIFS_SB(inode->i_sb);
|
| 1154 |
|
|
pTcon = cifs_sb->tcon;
|
| 1155 |
|
|
|
| 1156 |
|
|
offset += (loff_t)from;
|
| 1157 |
|
|
write_data = kmap(page);
|
| 1158 |
|
|
write_data += from;
|
| 1159 |
|
|
|
| 1160 |
|
|
if ((to > PAGE_CACHE_SIZE) || (from > to)) {
|
| 1161 |
|
|
kunmap(page);
|
| 1162 |
|
|
return -EIO;
|
| 1163 |
|
|
}
|
| 1164 |
|
|
|
| 1165 |
|
|
/* racing with truncate? */
|
| 1166 |
|
|
if (offset > mapping->host->i_size) {
|
| 1167 |
|
|
kunmap(page);
|
| 1168 |
|
|
return 0; /* don't care */
|
| 1169 |
|
|
}
|
| 1170 |
|
|
|
| 1171 |
|
|
/* check to make sure that we are not extending the file */
|
| 1172 |
|
|
if (mapping->host->i_size - offset < (loff_t)to)
|
| 1173 |
|
|
to = (unsigned)(mapping->host->i_size - offset);
|
| 1174 |
|
|
|
| 1175 |
|
|
open_file = find_writable_file(CIFS_I(mapping->host));
|
| 1176 |
|
|
if (open_file) {
|
| 1177 |
|
|
bytes_written = cifs_write(open_file->pfile, write_data,
|
| 1178 |
|
|
to-from, &offset);
|
| 1179 |
|
|
atomic_dec(&open_file->wrtPending);
|
| 1180 |
|
|
/* Does mm or vfs already set times? */
|
| 1181 |
|
|
inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb);
|
| 1182 |
|
|
if ((bytes_written > 0) && (offset)) {
|
| 1183 |
|
|
rc = 0;
|
| 1184 |
|
|
} else if (bytes_written < 0) {
|
| 1185 |
|
|
if (rc != -EBADF)
|
| 1186 |
|
|
rc = bytes_written;
|
| 1187 |
|
|
}
|
| 1188 |
|
|
} else {
|
| 1189 |
|
|
cFYI(1, ("No writeable filehandles for inode"));
|
| 1190 |
|
|
rc = -EIO;
|
| 1191 |
|
|
}
|
| 1192 |
|
|
|
| 1193 |
|
|
kunmap(page);
|
| 1194 |
|
|
return rc;
|
| 1195 |
|
|
}
|
| 1196 |
|
|
|
| 1197 |
|
|
static int cifs_writepages(struct address_space *mapping,
|
| 1198 |
|
|
struct writeback_control *wbc)
|
| 1199 |
|
|
{
|
| 1200 |
|
|
struct backing_dev_info *bdi = mapping->backing_dev_info;
|
| 1201 |
|
|
unsigned int bytes_to_write;
|
| 1202 |
|
|
unsigned int bytes_written;
|
| 1203 |
|
|
struct cifs_sb_info *cifs_sb;
|
| 1204 |
|
|
int done = 0;
|
| 1205 |
|
|
pgoff_t end;
|
| 1206 |
|
|
pgoff_t index;
|
| 1207 |
|
|
int range_whole = 0;
|
| 1208 |
|
|
struct kvec *iov;
|
| 1209 |
|
|
int len;
|
| 1210 |
|
|
int n_iov = 0;
|
| 1211 |
|
|
pgoff_t next;
|
| 1212 |
|
|
int nr_pages;
|
| 1213 |
|
|
__u64 offset = 0;
|
| 1214 |
|
|
struct cifsFileInfo *open_file;
|
| 1215 |
|
|
struct page *page;
|
| 1216 |
|
|
struct pagevec pvec;
|
| 1217 |
|
|
int rc = 0;
|
| 1218 |
|
|
int scanned = 0;
|
| 1219 |
|
|
int xid;
|
| 1220 |
|
|
|
| 1221 |
|
|
cifs_sb = CIFS_SB(mapping->host->i_sb);
|
| 1222 |
|
|
|
| 1223 |
|
|
/*
|
| 1224 |
|
|
* If wsize is smaller that the page cache size, default to writing
|
| 1225 |
|
|
* one page at a time via cifs_writepage
|
| 1226 |
|
|
*/
|
| 1227 |
|
|
if (cifs_sb->wsize < PAGE_CACHE_SIZE)
|
| 1228 |
|
|
return generic_writepages(mapping, wbc);
|
| 1229 |
|
|
|
| 1230 |
|
|
if ((cifs_sb->tcon->ses) && (cifs_sb->tcon->ses->server))
|
| 1231 |
|
|
if (cifs_sb->tcon->ses->server->secMode &
|
| 1232 |
|
|
(SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
|
| 1233 |
|
|
if (!experimEnabled)
|
| 1234 |
|
|
return generic_writepages(mapping, wbc);
|
| 1235 |
|
|
|
| 1236 |
|
|
iov = kmalloc(32 * sizeof(struct kvec), GFP_KERNEL);
|
| 1237 |
|
|
if (iov == NULL)
|
| 1238 |
|
|
return generic_writepages(mapping, wbc);
|
| 1239 |
|
|
|
| 1240 |
|
|
|
| 1241 |
|
|
/*
|
| 1242 |
|
|
* BB: Is this meaningful for a non-block-device file system?
|
| 1243 |
|
|
* If it is, we should test it again after we do I/O
|
| 1244 |
|
|
*/
|
| 1245 |
|
|
if (wbc->nonblocking && bdi_write_congested(bdi)) {
|
| 1246 |
|
|
wbc->encountered_congestion = 1;
|
| 1247 |
|
|
kfree(iov);
|
| 1248 |
|
|
return 0;
|
| 1249 |
|
|
}
|
| 1250 |
|
|
|
| 1251 |
|
|
xid = GetXid();
|
| 1252 |
|
|
|
| 1253 |
|
|
pagevec_init(&pvec, 0);
|
| 1254 |
|
|
if (wbc->range_cyclic) {
|
| 1255 |
|
|
index = mapping->writeback_index; /* Start from prev offset */
|
| 1256 |
|
|
end = -1;
|
| 1257 |
|
|
} else {
|
| 1258 |
|
|
index = wbc->range_start >> PAGE_CACHE_SHIFT;
|
| 1259 |
|
|
end = wbc->range_end >> PAGE_CACHE_SHIFT;
|
| 1260 |
|
|
if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
|
| 1261 |
|
|
range_whole = 1;
|
| 1262 |
|
|
scanned = 1;
|
| 1263 |
|
|
}
|
| 1264 |
|
|
retry:
|
| 1265 |
|
|
while (!done && (index <= end) &&
|
| 1266 |
|
|
(nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
|
| 1267 |
|
|
PAGECACHE_TAG_DIRTY,
|
| 1268 |
|
|
min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1))) {
|
| 1269 |
|
|
int first;
|
| 1270 |
|
|
unsigned int i;
|
| 1271 |
|
|
|
| 1272 |
|
|
first = -1;
|
| 1273 |
|
|
next = 0;
|
| 1274 |
|
|
n_iov = 0;
|
| 1275 |
|
|
bytes_to_write = 0;
|
| 1276 |
|
|
|
| 1277 |
|
|
for (i = 0; i < nr_pages; i++) {
|
| 1278 |
|
|
page = pvec.pages[i];
|
| 1279 |
|
|
/*
|
| 1280 |
|
|
* At this point we hold neither mapping->tree_lock nor
|
| 1281 |
|
|
* lock on the page itself: the page may be truncated or
|
| 1282 |
|
|
* invalidated (changing page->mapping to NULL), or even
|
| 1283 |
|
|
* swizzled back from swapper_space to tmpfs file
|
| 1284 |
|
|
* mapping
|
| 1285 |
|
|
*/
|
| 1286 |
|
|
|
| 1287 |
|
|
if (first < 0)
|
| 1288 |
|
|
lock_page(page);
|
| 1289 |
|
|
else if (TestSetPageLocked(page))
|
| 1290 |
|
|
break;
|
| 1291 |
|
|
|
| 1292 |
|
|
if (unlikely(page->mapping != mapping)) {
|
| 1293 |
|
|
unlock_page(page);
|
| 1294 |
|
|
break;
|
| 1295 |
|
|
}
|
| 1296 |
|
|
|
| 1297 |
|
|
if (!wbc->range_cyclic && page->index > end) {
|
| 1298 |
|
|
done = 1;
|
| 1299 |
|
|
unlock_page(page);
|
| 1300 |
|
|
break;
|
| 1301 |
|
|
}
|
| 1302 |
|
|
|
| 1303 |
|
|
if (next && (page->index != next)) {
|
| 1304 |
|
|
/* Not next consecutive page */
|
| 1305 |
|
|
unlock_page(page);
|
| 1306 |
|
|
break;
|
| 1307 |
|
|
}
|
| 1308 |
|
|
|
| 1309 |
|
|
if (wbc->sync_mode != WB_SYNC_NONE)
|
| 1310 |
|
|
wait_on_page_writeback(page);
|
| 1311 |
|
|
|
| 1312 |
|
|
if (PageWriteback(page) ||
|
| 1313 |
|
|
!clear_page_dirty_for_io(page)) {
|
| 1314 |
|
|
unlock_page(page);
|
| 1315 |
|
|
break;
|
| 1316 |
|
|
}
|
| 1317 |
|
|
|
| 1318 |
|
|
/*
|
| 1319 |
|
|
* This actually clears the dirty bit in the radix tree.
|
| 1320 |
|
|
* See cifs_writepage() for more commentary.
|
| 1321 |
|
|
*/
|
| 1322 |
|
|
set_page_writeback(page);
|
| 1323 |
|
|
|
| 1324 |
|
|
if (page_offset(page) >= mapping->host->i_size) {
|
| 1325 |
|
|
done = 1;
|
| 1326 |
|
|
unlock_page(page);
|
| 1327 |
|
|
end_page_writeback(page);
|
| 1328 |
|
|
break;
|
| 1329 |
|
|
}
|
| 1330 |
|
|
|
| 1331 |
|
|
/*
|
| 1332 |
|
|
* BB can we get rid of this? pages are held by pvec
|
| 1333 |
|
|
*/
|
| 1334 |
|
|
page_cache_get(page);
|
| 1335 |
|
|
|
| 1336 |
|
|
len = min(mapping->host->i_size - page_offset(page),
|
| 1337 |
|
|
(loff_t)PAGE_CACHE_SIZE);
|
| 1338 |
|
|
|
| 1339 |
|
|
/* reserve iov[0] for the smb header */
|
| 1340 |
|
|
n_iov++;
|
| 1341 |
|
|
iov[n_iov].iov_base = kmap(page);
|
| 1342 |
|
|
iov[n_iov].iov_len = len;
|
| 1343 |
|
|
bytes_to_write += len;
|
| 1344 |
|
|
|
| 1345 |
|
|
if (first < 0) {
|
| 1346 |
|
|
first = i;
|
| 1347 |
|
|
offset = page_offset(page);
|
| 1348 |
|
|
}
|
| 1349 |
|
|
next = page->index + 1;
|
| 1350 |
|
|
if (bytes_to_write + PAGE_CACHE_SIZE > cifs_sb->wsize)
|
| 1351 |
|
|
break;
|
| 1352 |
|
|
}
|
| 1353 |
|
|
if (n_iov) {
|
| 1354 |
|
|
/* Search for a writable handle every time we call
|
| 1355 |
|
|
* CIFSSMBWrite2. We can't rely on the last handle
|
| 1356 |
|
|
* we used to still be valid
|
| 1357 |
|
|
*/
|
| 1358 |
|
|
open_file = find_writable_file(CIFS_I(mapping->host));
|
| 1359 |
|
|
if (!open_file) {
|
| 1360 |
|
|
cERROR(1, ("No writable handles for inode"));
|
| 1361 |
|
|
rc = -EBADF;
|
| 1362 |
|
|
} else {
|
| 1363 |
|
|
rc = CIFSSMBWrite2(xid, cifs_sb->tcon,
|
| 1364 |
|
|
open_file->netfid,
|
| 1365 |
|
|
bytes_to_write, offset,
|
| 1366 |
|
|
&bytes_written, iov, n_iov,
|
| 1367 |
|
|
CIFS_LONG_OP);
|
| 1368 |
|
|
atomic_dec(&open_file->wrtPending);
|
| 1369 |
|
|
if (rc || bytes_written < bytes_to_write) {
|
| 1370 |
|
|
cERROR(1, ("Write2 ret %d, wrote %d",
|
| 1371 |
|
|
rc, bytes_written));
|
| 1372 |
|
|
/* BB what if continued retry is
|
| 1373 |
|
|
requested via mount flags? */
|
| 1374 |
|
|
if (rc == -ENOSPC)
|
| 1375 |
|
|
set_bit(AS_ENOSPC, &mapping->flags);
|
| 1376 |
|
|
else
|
| 1377 |
|
|
set_bit(AS_EIO, &mapping->flags);
|
| 1378 |
|
|
} else {
|
| 1379 |
|
|
cifs_stats_bytes_written(cifs_sb->tcon,
|
| 1380 |
|
|
bytes_written);
|
| 1381 |
|
|
}
|
| 1382 |
|
|
}
|
| 1383 |
|
|
for (i = 0; i < n_iov; i++) {
|
| 1384 |
|
|
page = pvec.pages[first + i];
|
| 1385 |
|
|
/* Should we also set page error on
|
| 1386 |
|
|
success rc but too little data written? */
|
| 1387 |
|
|
/* BB investigate retry logic on temporary
|
| 1388 |
|
|
server crash cases and how recovery works
|
| 1389 |
|
|
when page marked as error */
|
| 1390 |
|
|
if (rc)
|
| 1391 |
|
|
SetPageError(page);
|
| 1392 |
|
|
kunmap(page);
|
| 1393 |
|
|
unlock_page(page);
|
| 1394 |
|
|
end_page_writeback(page);
|
| 1395 |
|
|
page_cache_release(page);
|
| 1396 |
|
|
}
|
| 1397 |
|
|
if ((wbc->nr_to_write -= n_iov) <= 0)
|
| 1398 |
|
|
done = 1;
|
| 1399 |
|
|
index = next;
|
| 1400 |
|
|
}
|
| 1401 |
|
|
pagevec_release(&pvec);
|
| 1402 |
|
|
}
|
| 1403 |
|
|
if (!scanned && !done) {
|
| 1404 |
|
|
/*
|
| 1405 |
|
|
* We hit the last page and there is more work to be done: wrap
|
| 1406 |
|
|
* back to the start of the file
|
| 1407 |
|
|
*/
|
| 1408 |
|
|
scanned = 1;
|
| 1409 |
|
|
index = 0;
|
| 1410 |
|
|
goto retry;
|
| 1411 |
|
|
}
|
| 1412 |
|
|
if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
|
| 1413 |
|
|
mapping->writeback_index = index;
|
| 1414 |
|
|
|
| 1415 |
|
|
FreeXid(xid);
|
| 1416 |
|
|
kfree(iov);
|
| 1417 |
|
|
return rc;
|
| 1418 |
|
|
}
|
| 1419 |
|
|
|
| 1420 |
|
|
static int cifs_writepage(struct page *page, struct writeback_control *wbc)
|
| 1421 |
|
|
{
|
| 1422 |
|
|
int rc = -EFAULT;
|
| 1423 |
|
|
int xid;
|
| 1424 |
|
|
|
| 1425 |
|
|
xid = GetXid();
|
| 1426 |
|
|
/* BB add check for wbc flags */
|
| 1427 |
|
|
page_cache_get(page);
|
| 1428 |
|
|
if (!PageUptodate(page)) {
|
| 1429 |
|
|
cFYI(1, ("ppw - page not up to date"));
|
| 1430 |
|
|
}
|
| 1431 |
|
|
|
| 1432 |
|
|
/*
|
| 1433 |
|
|
* Set the "writeback" flag, and clear "dirty" in the radix tree.
|
| 1434 |
|
|
*
|
| 1435 |
|
|
* A writepage() implementation always needs to do either this,
|
| 1436 |
|
|
* or re-dirty the page with "redirty_page_for_writepage()" in
|
| 1437 |
|
|
* the case of a failure.
|
| 1438 |
|
|
*
|
| 1439 |
|
|
* Just unlocking the page will cause the radix tree tag-bits
|
| 1440 |
|
|
* to fail to update with the state of the page correctly.
|
| 1441 |
|
|
*/
|
| 1442 |
|
|
set_page_writeback(page);
|
| 1443 |
|
|
rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE);
|
| 1444 |
|
|
SetPageUptodate(page); /* BB add check for error and Clearuptodate? */
|
| 1445 |
|
|
unlock_page(page);
|
| 1446 |
|
|
end_page_writeback(page);
|
| 1447 |
|
|
page_cache_release(page);
|
| 1448 |
|
|
FreeXid(xid);
|
| 1449 |
|
|
return rc;
|
| 1450 |
|
|
}
|
| 1451 |
|
|
|
| 1452 |
|
|
static int cifs_commit_write(struct file *file, struct page *page,
|
| 1453 |
|
|
unsigned offset, unsigned to)
|
| 1454 |
|
|
{
|
| 1455 |
|
|
int xid;
|
| 1456 |
|
|
int rc = 0;
|
| 1457 |
|
|
struct inode *inode = page->mapping->host;
|
| 1458 |
|
|
loff_t position = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to;
|
| 1459 |
|
|
char *page_data;
|
| 1460 |
|
|
|
| 1461 |
|
|
xid = GetXid();
|
| 1462 |
|
|
cFYI(1, ("commit write for page %p up to position %lld for %d",
|
| 1463 |
|
|
page, position, to));
|
| 1464 |
|
|
spin_lock(&inode->i_lock);
|
| 1465 |
|
|
if (position > inode->i_size) {
|
| 1466 |
|
|
i_size_write(inode, position);
|
| 1467 |
|
|
}
|
| 1468 |
|
|
spin_unlock(&inode->i_lock);
|
| 1469 |
|
|
if (!PageUptodate(page)) {
|
| 1470 |
|
|
position = ((loff_t)page->index << PAGE_CACHE_SHIFT) + offset;
|
| 1471 |
|
|
/* can not rely on (or let) writepage write this data */
|
| 1472 |
|
|
if (to < offset) {
|
| 1473 |
|
|
cFYI(1, ("Illegal offsets, can not copy from %d to %d",
|
| 1474 |
|
|
offset, to));
|
| 1475 |
|
|
FreeXid(xid);
|
| 1476 |
|
|
return rc;
|
| 1477 |
|
|
}
|
| 1478 |
|
|
/* this is probably better than directly calling
|
| 1479 |
|
|
partialpage_write since in this function the file handle is
|
| 1480 |
|
|
known which we might as well leverage */
|
| 1481 |
|
|
/* BB check if anything else missing out of ppw
|
| 1482 |
|
|
such as updating last write time */
|
| 1483 |
|
|
page_data = kmap(page);
|
| 1484 |
|
|
rc = cifs_write(file, page_data + offset, to-offset,
|
| 1485 |
|
|
&position);
|
| 1486 |
|
|
if (rc > 0)
|
| 1487 |
|
|
rc = 0;
|
| 1488 |
|
|
/* else if (rc < 0) should we set writebehind rc? */
|
| 1489 |
|
|
kunmap(page);
|
| 1490 |
|
|
} else {
|
| 1491 |
|
|
set_page_dirty(page);
|
| 1492 |
|
|
}
|
| 1493 |
|
|
|
| 1494 |
|
|
FreeXid(xid);
|
| 1495 |
|
|
return rc;
|
| 1496 |
|
|
}
|
| 1497 |
|
|
|
| 1498 |
|
|
int cifs_fsync(struct file *file, struct dentry *dentry, int datasync)
|
| 1499 |
|
|
{
|
| 1500 |
|
|
int xid;
|
| 1501 |
|
|
int rc = 0;
|
| 1502 |
|
|
struct inode *inode = file->f_path.dentry->d_inode;
|
| 1503 |
|
|
|
| 1504 |
|
|
xid = GetXid();
|
| 1505 |
|
|
|
| 1506 |
|
|
cFYI(1, ("Sync file - name: %s datasync: 0x%x",
|
| 1507 |
|
|
dentry->d_name.name, datasync));
|
| 1508 |
|
|
|
| 1509 |
|
|
rc = filemap_write_and_wait(inode->i_mapping);
|
| 1510 |
|
|
if (rc == 0) {
|
| 1511 |
|
|
rc = CIFS_I(inode)->write_behind_rc;
|
| 1512 |
|
|
CIFS_I(inode)->write_behind_rc = 0;
|
| 1513 |
|
|
}
|
| 1514 |
|
|
FreeXid(xid);
|
| 1515 |
|
|
return rc;
|
| 1516 |
|
|
}
|
| 1517 |
|
|
|
| 1518 |
|
|
/* static void cifs_sync_page(struct page *page)
|
| 1519 |
|
|
{
|
| 1520 |
|
|
struct address_space *mapping;
|
| 1521 |
|
|
struct inode *inode;
|
| 1522 |
|
|
unsigned long index = page->index;
|
| 1523 |
|
|
unsigned int rpages = 0;
|
| 1524 |
|
|
int rc = 0;
|
| 1525 |
|
|
|
| 1526 |
|
|
cFYI(1, ("sync page %p",page));
|
| 1527 |
|
|
mapping = page->mapping;
|
| 1528 |
|
|
if (!mapping)
|
| 1529 |
|
|
return 0;
|
| 1530 |
|
|
inode = mapping->host;
|
| 1531 |
|
|
if (!inode)
|
| 1532 |
|
|
return; */
|
| 1533 |
|
|
|
| 1534 |
|
|
/* fill in rpages then
|
| 1535 |
|
|
result = cifs_pagein_inode(inode, index, rpages); */ /* BB finish */
|
| 1536 |
|
|
|
| 1537 |
|
|
/* cFYI(1, ("rpages is %d for sync page of Index %ld", rpages, index));
|
| 1538 |
|
|
|
| 1539 |
|
|
#if 0
|
| 1540 |
|
|
if (rc < 0)
|
| 1541 |
|
|
return rc;
|
| 1542 |
|
|
return 0;
|
| 1543 |
|
|
#endif
|
| 1544 |
|
|
} */
|
| 1545 |
|
|
|
| 1546 |
|
|
/*
|
| 1547 |
|
|
* As file closes, flush all cached write data for this inode checking
|
| 1548 |
|
|
* for write behind errors.
|
| 1549 |
|
|
*/
|
| 1550 |
|
|
int cifs_flush(struct file *file, fl_owner_t id)
|
| 1551 |
|
|
{
|
| 1552 |
|
|
struct inode *inode = file->f_path.dentry->d_inode;
|
| 1553 |
|
|
int rc = 0;
|
| 1554 |
|
|
|
| 1555 |
|
|
/* Rather than do the steps manually:
|
| 1556 |
|
|
lock the inode for writing
|
| 1557 |
|
|
loop through pages looking for write behind data (dirty pages)
|
| 1558 |
|
|
coalesce into contiguous 16K (or smaller) chunks to write to server
|
| 1559 |
|
|
send to server (prefer in parallel)
|
| 1560 |
|
|
deal with writebehind errors
|
| 1561 |
|
|
unlock inode for writing
|
| 1562 |
|
|
filemapfdatawrite appears easier for the time being */
|
| 1563 |
|
|
|
| 1564 |
|
|
rc = filemap_fdatawrite(inode->i_mapping);
|
| 1565 |
|
|
/* reset wb rc if we were able to write out dirty pages */
|
| 1566 |
|
|
if (!rc) {
|
| 1567 |
|
|
rc = CIFS_I(inode)->write_behind_rc;
|
| 1568 |
|
|
CIFS_I(inode)->write_behind_rc = 0;
|
| 1569 |
|
|
}
|
| 1570 |
|
|
|
| 1571 |
|
|
cFYI(1, ("Flush inode %p file %p rc %d", inode, file, rc));
|
| 1572 |
|
|
|
| 1573 |
|
|
return rc;
|
| 1574 |
|
|
}
|
| 1575 |
|
|
|
| 1576 |
|
|
ssize_t cifs_user_read(struct file *file, char __user *read_data,
|
| 1577 |
|
|
size_t read_size, loff_t *poffset)
|
| 1578 |
|
|
{
|
| 1579 |
|
|
int rc = -EACCES;
|
| 1580 |
|
|
unsigned int bytes_read = 0;
|
| 1581 |
|
|
unsigned int total_read = 0;
|
| 1582 |
|
|
unsigned int current_read_size;
|
| 1583 |
|
|
struct cifs_sb_info *cifs_sb;
|
| 1584 |
|
|
struct cifsTconInfo *pTcon;
|
| 1585 |
|
|
int xid;
|
| 1586 |
|
|
struct cifsFileInfo *open_file;
|
| 1587 |
|
|
char *smb_read_data;
|
| 1588 |
|
|
char __user *current_offset;
|
| 1589 |
|
|
struct smb_com_read_rsp *pSMBr;
|
| 1590 |
|
|
|
| 1591 |
|
|
xid = GetXid();
|
| 1592 |
|
|
cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
|
| 1593 |
|
|
pTcon = cifs_sb->tcon;
|
| 1594 |
|
|
|
| 1595 |
|
|
if (file->private_data == NULL) {
|
| 1596 |
|
|
FreeXid(xid);
|
| 1597 |
|
|
return -EBADF;
|
| 1598 |
|
|
}
|
| 1599 |
|
|
open_file = (struct cifsFileInfo *)file->private_data;
|
| 1600 |
|
|
|
| 1601 |
|
|
if ((file->f_flags & O_ACCMODE) == O_WRONLY) {
|
| 1602 |
|
|
cFYI(1, ("attempting read on write only file instance"));
|
| 1603 |
|
|
}
|
| 1604 |
|
|
for (total_read = 0, current_offset = read_data;
|
| 1605 |
|
|
read_size > total_read;
|
| 1606 |
|
|
total_read += bytes_read, current_offset += bytes_read) {
|
| 1607 |
|
|
current_read_size = min_t(const int, read_size - total_read,
|
| 1608 |
|
|
cifs_sb->rsize);
|
| 1609 |
|
|
rc = -EAGAIN;
|
| 1610 |
|
|
smb_read_data = NULL;
|
| 1611 |
|
|
while (rc == -EAGAIN) {
|
| 1612 |
|
|
int buf_type = CIFS_NO_BUFFER;
|
| 1613 |
|
|
if ((open_file->invalidHandle) &&
|
| 1614 |
|
|
(!open_file->closePend)) {
|
| 1615 |
|
|
rc = cifs_reopen_file(file, TRUE);
|
| 1616 |
|
|
if (rc != 0)
|
| 1617 |
|
|
break;
|
| 1618 |
|
|
}
|
| 1619 |
|
|
rc = CIFSSMBRead(xid, pTcon,
|
| 1620 |
|
|
open_file->netfid,
|
| 1621 |
|
|
current_read_size, *poffset,
|
| 1622 |
|
|
&bytes_read, &smb_read_data,
|
| 1623 |
|
|
&buf_type);
|
| 1624 |
|
|
pSMBr = (struct smb_com_read_rsp *)smb_read_data;
|
| 1625 |
|
|
if (smb_read_data) {
|
| 1626 |
|
|
if (copy_to_user(current_offset,
|
| 1627 |
|
|
smb_read_data +
|
| 1628 |
|
|
4 /* RFC1001 length field */ +
|
| 1629 |
|
|
le16_to_cpu(pSMBr->DataOffset),
|
| 1630 |
|
|
bytes_read)) {
|
| 1631 |
|
|
rc = -EFAULT;
|
| 1632 |
|
|
}
|
| 1633 |
|
|
|
| 1634 |
|
|
if (buf_type == CIFS_SMALL_BUFFER)
|
| 1635 |
|
|
cifs_small_buf_release(smb_read_data);
|
| 1636 |
|
|
else if (buf_type == CIFS_LARGE_BUFFER)
|
| 1637 |
|
|
cifs_buf_release(smb_read_data);
|
| 1638 |
|
|
smb_read_data = NULL;
|
| 1639 |
|
|
}
|
| 1640 |
|
|
}
|
| 1641 |
|
|
if (rc || (bytes_read == 0)) {
|
| 1642 |
|
|
if (total_read) {
|
| 1643 |
|
|
break;
|
| 1644 |
|
|
} else {
|
| 1645 |
|
|
FreeXid(xid);
|
| 1646 |
|
|
return rc;
|
| 1647 |
|
|
}
|
| 1648 |
|
|
} else {
|
| 1649 |
|
|
cifs_stats_bytes_read(pTcon, bytes_read);
|
| 1650 |
|
|
*poffset += bytes_read;
|
| 1651 |
|
|
}
|
| 1652 |
|
|
}
|
| 1653 |
|
|
FreeXid(xid);
|
| 1654 |
|
|
return total_read;
|
| 1655 |
|
|
}
|
| 1656 |
|
|
|
| 1657 |
|
|
|
| 1658 |
|
|
static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size,
|
| 1659 |
|
|
loff_t *poffset)
|
| 1660 |
|
|
{
|
| 1661 |
|
|
int rc = -EACCES;
|
| 1662 |
|
|
unsigned int bytes_read = 0;
|
| 1663 |
|
|
unsigned int total_read;
|
| 1664 |
|
|
unsigned int current_read_size;
|
| 1665 |
|
|
struct cifs_sb_info *cifs_sb;
|
| 1666 |
|
|
struct cifsTconInfo *pTcon;
|
| 1667 |
|
|
int xid;
|
| 1668 |
|
|
char *current_offset;
|
| 1669 |
|
|
struct cifsFileInfo *open_file;
|
| 1670 |
|
|
int buf_type = CIFS_NO_BUFFER;
|
| 1671 |
|
|
|
| 1672 |
|
|
xid = GetXid();
|
| 1673 |
|
|
cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
|
| 1674 |
|
|
pTcon = cifs_sb->tcon;
|
| 1675 |
|
|
|
| 1676 |
|
|
if (file->private_data == NULL) {
|
| 1677 |
|
|
FreeXid(xid);
|
| 1678 |
|
|
return -EBADF;
|
| 1679 |
|
|
}
|
| 1680 |
|
|
open_file = (struct cifsFileInfo *)file->private_data;
|
| 1681 |
|
|
|
| 1682 |
|
|
if ((file->f_flags & O_ACCMODE) == O_WRONLY)
|
| 1683 |
|
|
cFYI(1, ("attempting read on write only file instance"));
|
| 1684 |
|
|
|
| 1685 |
|
|
for (total_read = 0, current_offset = read_data;
|
| 1686 |
|
|
read_size > total_read;
|
| 1687 |
|
|
total_read += bytes_read, current_offset += bytes_read) {
|
| 1688 |
|
|
current_read_size = min_t(const int, read_size - total_read,
|
| 1689 |
|
|
cifs_sb->rsize);
|
| 1690 |
|
|
/* For windows me and 9x we do not want to request more
|
| 1691 |
|
|
than it negotiated since it will refuse the read then */
|
| 1692 |
|
|
if ((pTcon->ses) &&
|
| 1693 |
|
|
!(pTcon->ses->capabilities & CAP_LARGE_FILES)) {
|
| 1694 |
|
|
current_read_size = min_t(const int, current_read_size,
|
| 1695 |
|
|
pTcon->ses->server->maxBuf - 128);
|
| 1696 |
|
|
}
|
| 1697 |
|
|
rc = -EAGAIN;
|
| 1698 |
|
|
while (rc == -EAGAIN) {
|
| 1699 |
|
|
if ((open_file->invalidHandle) &&
|
| 1700 |
|
|
(!open_file->closePend)) {
|
| 1701 |
|
|
rc = cifs_reopen_file(file, TRUE);
|
| 1702 |
|
|
if (rc != 0)
|
| 1703 |
|
|
break;
|
| 1704 |
|
|
}
|
| 1705 |
|
|
rc = CIFSSMBRead(xid, pTcon,
|
| 1706 |
|
|
open_file->netfid,
|
| 1707 |
|
|
current_read_size, *poffset,
|
| 1708 |
|
|
&bytes_read, ¤t_offset,
|
| 1709 |
|
|
&buf_type);
|
| 1710 |
|
|
}
|
| 1711 |
|
|
if (rc || (bytes_read == 0)) {
|
| 1712 |
|
|
if (total_read) {
|
| 1713 |
|
|
break;
|
| 1714 |
|
|
} else {
|
| 1715 |
|
|
FreeXid(xid);
|
| 1716 |
|
|
return rc;
|
| 1717 |
|
|
}
|
| 1718 |
|
|
} else {
|
| 1719 |
|
|
cifs_stats_bytes_read(pTcon, total_read);
|
| 1720 |
|
|
*poffset += bytes_read;
|
| 1721 |
|
|
}
|
| 1722 |
|
|
}
|
| 1723 |
|
|
FreeXid(xid);
|
| 1724 |
|
|
return total_read;
|
| 1725 |
|
|
}
|
| 1726 |
|
|
|
| 1727 |
|
|
int cifs_file_mmap(struct file *file, struct vm_area_struct *vma)
|
| 1728 |
|
|
{
|
| 1729 |
|
|
struct dentry *dentry = file->f_path.dentry;
|
| 1730 |
|
|
int rc, xid;
|
| 1731 |
|
|
|
| 1732 |
|
|
xid = GetXid();
|
| 1733 |
|
|
rc = cifs_revalidate(dentry);
|
| 1734 |
|
|
if (rc) {
|
| 1735 |
|
|
cFYI(1, ("Validation prior to mmap failed, error=%d", rc));
|
| 1736 |
|
|
FreeXid(xid);
|
| 1737 |
|
|
return rc;
|
| 1738 |
|
|
}
|
| 1739 |
|
|
rc = generic_file_mmap(file, vma);
|
| 1740 |
|
|
FreeXid(xid);
|
| 1741 |
|
|
return rc;
|
| 1742 |
|
|
}
|
| 1743 |
|
|
|
| 1744 |
|
|
|
| 1745 |
|
|
static void cifs_copy_cache_pages(struct address_space *mapping,
|
| 1746 |
|
|
struct list_head *pages, int bytes_read, char *data,
|
| 1747 |
|
|
struct pagevec *plru_pvec)
|
| 1748 |
|
|
{
|
| 1749 |
|
|
struct page *page;
|
| 1750 |
|
|
char *target;
|
| 1751 |
|
|
|
| 1752 |
|
|
while (bytes_read > 0) {
|
| 1753 |
|
|
if (list_empty(pages))
|
| 1754 |
|
|
break;
|
| 1755 |
|
|
|
| 1756 |
|
|
page = list_entry(pages->prev, struct page, lru);
|
| 1757 |
|
|
list_del(&page->lru);
|
| 1758 |
|
|
|
| 1759 |
|
|
if (add_to_page_cache(page, mapping, page->index,
|
| 1760 |
|
|
GFP_KERNEL)) {
|
| 1761 |
|
|
page_cache_release(page);
|
| 1762 |
|
|
cFYI(1, ("Add page cache failed"));
|
| 1763 |
|
|
data += PAGE_CACHE_SIZE;
|
| 1764 |
|
|
bytes_read -= PAGE_CACHE_SIZE;
|
| 1765 |
|
|
continue;
|
| 1766 |
|
|
}
|
| 1767 |
|
|
|
| 1768 |
|
|
target = kmap_atomic(page, KM_USER0);
|
| 1769 |
|
|
|
| 1770 |
|
|
if (PAGE_CACHE_SIZE > bytes_read) {
|
| 1771 |
|
|
memcpy(target, data, bytes_read);
|
| 1772 |
|
|
/* zero the tail end of this partial page */
|
| 1773 |
|
|
memset(target + bytes_read, 0,
|
| 1774 |
|
|
PAGE_CACHE_SIZE - bytes_read);
|
| 1775 |
|
|
bytes_read = 0;
|
| 1776 |
|
|
} else {
|
| 1777 |
|
|
memcpy(target, data, PAGE_CACHE_SIZE);
|
| 1778 |
|
|
bytes_read -= PAGE_CACHE_SIZE;
|
| 1779 |
|
|
}
|
| 1780 |
|
|
kunmap_atomic(target, KM_USER0);
|
| 1781 |
|
|
|
| 1782 |
|
|
flush_dcache_page(page);
|
| 1783 |
|
|
SetPageUptodate(page);
|
| 1784 |
|
|
unlock_page(page);
|
| 1785 |
|
|
if (!pagevec_add(plru_pvec, page))
|
| 1786 |
|
|
__pagevec_lru_add(plru_pvec);
|
| 1787 |
|
|
data += PAGE_CACHE_SIZE;
|
| 1788 |
|
|
}
|
| 1789 |
|
|
return;
|
| 1790 |
|
|
}
|
| 1791 |
|
|
|
| 1792 |
|
|
static int cifs_readpages(struct file *file, struct address_space *mapping,
|
| 1793 |
|
|
struct list_head *page_list, unsigned num_pages)
|
| 1794 |
|
|
{
|
| 1795 |
|
|
int rc = -EACCES;
|
| 1796 |
|
|
int xid;
|
| 1797 |
|
|
loff_t offset;
|
| 1798 |
|
|
struct page *page;
|
| 1799 |
|
|
struct cifs_sb_info *cifs_sb;
|
| 1800 |
|
|
struct cifsTconInfo *pTcon;
|
| 1801 |
|
|
unsigned int bytes_read = 0;
|
| 1802 |
|
|
unsigned int read_size, i;
|
| 1803 |
|
|
char *smb_read_data = NULL;
|
| 1804 |
|
|
struct smb_com_read_rsp *pSMBr;
|
| 1805 |
|
|
struct pagevec lru_pvec;
|
| 1806 |
|
|
struct cifsFileInfo *open_file;
|
| 1807 |
|
|
int buf_type = CIFS_NO_BUFFER;
|
| 1808 |
|
|
|
| 1809 |
|
|
xid = GetXid();
|
| 1810 |
|
|
if (file->private_data == NULL) {
|
| 1811 |
|
|
FreeXid(xid);
|
| 1812 |
|
|
return -EBADF;
|
| 1813 |
|
|
}
|
| 1814 |
|
|
open_file = (struct cifsFileInfo *)file->private_data;
|
| 1815 |
|
|
cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
|
| 1816 |
|
|
pTcon = cifs_sb->tcon;
|
| 1817 |
|
|
|
| 1818 |
|
|
pagevec_init(&lru_pvec, 0);
|
| 1819 |
|
|
#ifdef CONFIG_CIFS_DEBUG2
|
| 1820 |
|
|
cFYI(1, ("rpages: num pages %d", num_pages));
|
| 1821 |
|
|
#endif
|
| 1822 |
|
|
for (i = 0; i < num_pages; ) {
|
| 1823 |
|
|
unsigned contig_pages;
|
| 1824 |
|
|
struct page *tmp_page;
|
| 1825 |
|
|
unsigned long expected_index;
|
| 1826 |
|
|
|
| 1827 |
|
|
if (list_empty(page_list))
|
| 1828 |
|
|
break;
|
| 1829 |
|
|
|
| 1830 |
|
|
page = list_entry(page_list->prev, struct page, lru);
|
| 1831 |
|
|
offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
|
| 1832 |
|
|
|
| 1833 |
|
|
/* count adjacent pages that we will read into */
|
| 1834 |
|
|
contig_pages = 0;
|
| 1835 |
|
|
expected_index =
|
| 1836 |
|
|
list_entry(page_list->prev, struct page, lru)->index;
|
| 1837 |
|
|
list_for_each_entry_reverse(tmp_page, page_list, lru) {
|
| 1838 |
|
|
if (tmp_page->index == expected_index) {
|
| 1839 |
|
|
contig_pages++;
|
| 1840 |
|
|
expected_index++;
|
| 1841 |
|
|
} else
|
| 1842 |
|
|
break;
|
| 1843 |
|
|
}
|
| 1844 |
|
|
if (contig_pages + i > num_pages)
|
| 1845 |
|
|
contig_pages = num_pages - i;
|
| 1846 |
|
|
|
| 1847 |
|
|
/* for reads over a certain size could initiate async
|
| 1848 |
|
|
read ahead */
|
| 1849 |
|
|
|
| 1850 |
|
|
read_size = contig_pages * PAGE_CACHE_SIZE;
|
| 1851 |
|
|
/* Read size needs to be in multiples of one page */
|
| 1852 |
|
|
read_size = min_t(const unsigned int, read_size,
|
| 1853 |
|
|
cifs_sb->rsize & PAGE_CACHE_MASK);
|
| 1854 |
|
|
#ifdef CONFIG_CIFS_DEBUG2
|
| 1855 |
|
|
cFYI(1, ("rpages: read size 0x%x contiguous pages %d",
|
| 1856 |
|
|
read_size, contig_pages));
|
| 1857 |
|
|
#endif
|
| 1858 |
|
|
rc = -EAGAIN;
|
| 1859 |
|
|
while (rc == -EAGAIN) {
|
| 1860 |
|
|
if ((open_file->invalidHandle) &&
|
| 1861 |
|
|
(!open_file->closePend)) {
|
| 1862 |
|
|
rc = cifs_reopen_file(file, TRUE);
|
| 1863 |
|
|
if (rc != 0)
|
| 1864 |
|
|
break;
|
| 1865 |
|
|
}
|
| 1866 |
|
|
|
| 1867 |
|
|
rc = CIFSSMBRead(xid, pTcon,
|
| 1868 |
|
|
open_file->netfid,
|
| 1869 |
|
|
read_size, offset,
|
| 1870 |
|
|
&bytes_read, &smb_read_data,
|
| 1871 |
|
|
&buf_type);
|
| 1872 |
|
|
/* BB more RC checks ? */
|
| 1873 |
|
|
if (rc == -EAGAIN) {
|
| 1874 |
|
|
if (smb_read_data) {
|
| 1875 |
|
|
if (buf_type == CIFS_SMALL_BUFFER)
|
| 1876 |
|
|
cifs_small_buf_release(smb_read_data);
|
| 1877 |
|
|
else if (buf_type == CIFS_LARGE_BUFFER)
|
| 1878 |
|
|
cifs_buf_release(smb_read_data);
|
| 1879 |
|
|
smb_read_data = NULL;
|
| 1880 |
|
|
}
|
| 1881 |
|
|
}
|
| 1882 |
|
|
}
|
| 1883 |
|
|
if ((rc < 0) || (smb_read_data == NULL)) {
|
| 1884 |
|
|
cFYI(1, ("Read error in readpages: %d", rc));
|
| 1885 |
|
|
break;
|
| 1886 |
|
|
} else if (bytes_read > 0) {
|
| 1887 |
|
|
task_io_account_read(bytes_read);
|
| 1888 |
|
|
pSMBr = (struct smb_com_read_rsp *)smb_read_data;
|
| 1889 |
|
|
cifs_copy_cache_pages(mapping, page_list, bytes_read,
|
| 1890 |
|
|
smb_read_data + 4 /* RFC1001 hdr */ +
|
| 1891 |
|
|
le16_to_cpu(pSMBr->DataOffset), &lru_pvec);
|
| 1892 |
|
|
|
| 1893 |
|
|
i += bytes_read >> PAGE_CACHE_SHIFT;
|
| 1894 |
|
|
cifs_stats_bytes_read(pTcon, bytes_read);
|
| 1895 |
|
|
if ((bytes_read & PAGE_CACHE_MASK) != bytes_read) {
|
| 1896 |
|
|
i++; /* account for partial page */
|
| 1897 |
|
|
|
| 1898 |
|
|
/* server copy of file can have smaller size
|
| 1899 |
|
|
than client */
|
| 1900 |
|
|
/* BB do we need to verify this common case ?
|
| 1901 |
|
|
this case is ok - if we are at server EOF
|
| 1902 |
|
|
we will hit it on next read */
|
| 1903 |
|
|
|
| 1904 |
|
|
/* break; */
|
| 1905 |
|
|
}
|
| 1906 |
|
|
} else {
|
| 1907 |
|
|
cFYI(1, ("No bytes read (%d) at offset %lld . "
|
| 1908 |
|
|
"Cleaning remaining pages from readahead list",
|
| 1909 |
|
|
bytes_read, offset));
|
| 1910 |
|
|
/* BB turn off caching and do new lookup on
|
| 1911 |
|
|
file size at server? */
|
| 1912 |
|
|
break;
|
| 1913 |
|
|
}
|
| 1914 |
|
|
if (smb_read_data) {
|
| 1915 |
|
|
if (buf_type == CIFS_SMALL_BUFFER)
|
| 1916 |
|
|
cifs_small_buf_release(smb_read_data);
|
| 1917 |
|
|
else if (buf_type == CIFS_LARGE_BUFFER)
|
| 1918 |
|
|
cifs_buf_release(smb_read_data);
|
| 1919 |
|
|
smb_read_data = NULL;
|
| 1920 |
|
|
}
|
| 1921 |
|
|
bytes_read = 0;
|
| 1922 |
|
|
}
|
| 1923 |
|
|
|
| 1924 |
|
|
pagevec_lru_add(&lru_pvec);
|
| 1925 |
|
|
|
| 1926 |
|
|
/* need to free smb_read_data buf before exit */
|
| 1927 |
|
|
if (smb_read_data) {
|
| 1928 |
|
|
if (buf_type == CIFS_SMALL_BUFFER)
|
| 1929 |
|
|
cifs_small_buf_release(smb_read_data);
|
| 1930 |
|
|
else if (buf_type == CIFS_LARGE_BUFFER)
|
| 1931 |
|
|
cifs_buf_release(smb_read_data);
|
| 1932 |
|
|
smb_read_data = NULL;
|
| 1933 |
|
|
}
|
| 1934 |
|
|
|
| 1935 |
|
|
FreeXid(xid);
|
| 1936 |
|
|
return rc;
|
| 1937 |
|
|
}
|
| 1938 |
|
|
|
| 1939 |
|
|
static int cifs_readpage_worker(struct file *file, struct page *page,
|
| 1940 |
|
|
loff_t *poffset)
|
| 1941 |
|
|
{
|
| 1942 |
|
|
char *read_data;
|
| 1943 |
|
|
int rc;
|
| 1944 |
|
|
|
| 1945 |
|
|
page_cache_get(page);
|
| 1946 |
|
|
read_data = kmap(page);
|
| 1947 |
|
|
/* for reads over a certain size could initiate async read ahead */
|
| 1948 |
|
|
|
| 1949 |
|
|
rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset);
|
| 1950 |
|
|
|
| 1951 |
|
|
if (rc < 0)
|
| 1952 |
|
|
goto io_error;
|
| 1953 |
|
|
else
|
| 1954 |
|
|
cFYI(1, ("Bytes read %d", rc));
|
| 1955 |
|
|
|
| 1956 |
|
|
file->f_path.dentry->d_inode->i_atime =
|
| 1957 |
|
|
current_fs_time(file->f_path.dentry->d_inode->i_sb);
|
| 1958 |
|
|
|
| 1959 |
|
|
if (PAGE_CACHE_SIZE > rc)
|
| 1960 |
|
|
memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc);
|
| 1961 |
|
|
|
| 1962 |
|
|
flush_dcache_page(page);
|
| 1963 |
|
|
SetPageUptodate(page);
|
| 1964 |
|
|
rc = 0;
|
| 1965 |
|
|
|
| 1966 |
|
|
io_error:
|
| 1967 |
|
|
kunmap(page);
|
| 1968 |
|
|
page_cache_release(page);
|
| 1969 |
|
|
return rc;
|
| 1970 |
|
|
}
|
| 1971 |
|
|
|
| 1972 |
|
|
static int cifs_readpage(struct file *file, struct page *page)
|
| 1973 |
|
|
{
|
| 1974 |
|
|
loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
|
| 1975 |
|
|
int rc = -EACCES;
|
| 1976 |
|
|
int xid;
|
| 1977 |
|
|
|
| 1978 |
|
|
xid = GetXid();
|
| 1979 |
|
|
|
| 1980 |
|
|
if (file->private_data == NULL) {
|
| 1981 |
|
|
FreeXid(xid);
|
| 1982 |
|
|
return -EBADF;
|
| 1983 |
|
|
}
|
| 1984 |
|
|
|
| 1985 |
|
|
cFYI(1, ("readpage %p at offset %d 0x%x\n",
|
| 1986 |
|
|
page, (int)offset, (int)offset));
|
| 1987 |
|
|
|
| 1988 |
|
|
rc = cifs_readpage_worker(file, page, &offset);
|
| 1989 |
|
|
|
| 1990 |
|
|
unlock_page(page);
|
| 1991 |
|
|
|
| 1992 |
|
|
FreeXid(xid);
|
| 1993 |
|
|
return rc;
|
| 1994 |
|
|
}
|
| 1995 |
|
|
|
| 1996 |
|
|
static int is_inode_writable(struct cifsInodeInfo *cifs_inode)
|
| 1997 |
|
|
{
|
| 1998 |
|
|
struct cifsFileInfo *open_file;
|
| 1999 |
|
|
|
| 2000 |
|
|
read_lock(&GlobalSMBSeslock);
|
| 2001 |
|
|
list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
|
| 2002 |
|
|
if (open_file->closePend)
|
| 2003 |
|
|
continue;
|
| 2004 |
|
|
if (open_file->pfile &&
|
| 2005 |
|
|
((open_file->pfile->f_flags & O_RDWR) ||
|
| 2006 |
|
|
(open_file->pfile->f_flags & O_WRONLY))) {
|
| 2007 |
|
|
read_unlock(&GlobalSMBSeslock);
|
| 2008 |
|
|
return 1;
|
| 2009 |
|
|
}
|
| 2010 |
|
|
}
|
| 2011 |
|
|
read_unlock(&GlobalSMBSeslock);
|
| 2012 |
|
|
return 0;
|
| 2013 |
|
|
}
|
| 2014 |
|
|
|
| 2015 |
|
|
/* We do not want to update the file size from server for inodes
|
| 2016 |
|
|
open for write - to avoid races with writepage extending
|
| 2017 |
|
|
the file - in the future we could consider allowing
|
| 2018 |
|
|
refreshing the inode only on increases in the file size
|
| 2019 |
|
|
but this is tricky to do without racing with writebehind
|
| 2020 |
|
|
page caching in the current Linux kernel design */
|
| 2021 |
|
|
int is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file)
|
| 2022 |
|
|
{
|
| 2023 |
|
|
if (!cifsInode)
|
| 2024 |
|
|
return 1;
|
| 2025 |
|
|
|
| 2026 |
|
|
if (is_inode_writable(cifsInode)) {
|
| 2027 |
|
|
/* This inode is open for write at least once */
|
| 2028 |
|
|
struct cifs_sb_info *cifs_sb;
|
| 2029 |
|
|
|
| 2030 |
|
|
cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb);
|
| 2031 |
|
|
if ( cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO ) {
|
| 2032 |
|
|
/* since no page cache to corrupt on directio
|
| 2033 |
|
|
we can change size safely */
|
| 2034 |
|
|
return 1;
|
| 2035 |
|
|
}
|
| 2036 |
|
|
|
| 2037 |
|
|
if (i_size_read(&cifsInode->vfs_inode) < end_of_file)
|
| 2038 |
|
|
return 1;
|
| 2039 |
|
|
|
| 2040 |
|
|
return 0;
|
| 2041 |
|
|
} else
|
| 2042 |
|
|
return 1;
|
| 2043 |
|
|
}
|
| 2044 |
|
|
|
| 2045 |
|
|
static int cifs_prepare_write(struct file *file, struct page *page,
|
| 2046 |
|
|
unsigned from, unsigned to)
|
| 2047 |
|
|
{
|
| 2048 |
|
|
int rc = 0;
|
| 2049 |
|
|
loff_t i_size;
|
| 2050 |
|
|
loff_t offset;
|
| 2051 |
|
|
|
| 2052 |
|
|
cFYI(1, ("prepare write for page %p from %d to %d", page, from, to));
|
| 2053 |
|
|
if (PageUptodate(page))
|
| 2054 |
|
|
return 0;
|
| 2055 |
|
|
|
| 2056 |
|
|
/* If we are writing a full page it will be up to date,
|
| 2057 |
|
|
no need to read from the server */
|
| 2058 |
|
|
if ((to == PAGE_CACHE_SIZE) && (from == 0)) {
|
| 2059 |
|
|
SetPageUptodate(page);
|
| 2060 |
|
|
return 0;
|
| 2061 |
|
|
}
|
| 2062 |
|
|
|
| 2063 |
|
|
offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
|
| 2064 |
|
|
i_size = i_size_read(page->mapping->host);
|
| 2065 |
|
|
|
| 2066 |
|
|
if ((offset >= i_size) ||
|
| 2067 |
|
|
((from == 0) && (offset + to) >= i_size)) {
|
| 2068 |
|
|
/*
|
| 2069 |
|
|
* We don't need to read data beyond the end of the file.
|
| 2070 |
|
|
* zero it, and set the page uptodate
|
| 2071 |
|
|
*/
|
| 2072 |
|
|
simple_prepare_write(file, page, from, to);
|
| 2073 |
|
|
SetPageUptodate(page);
|
| 2074 |
|
|
} else if ((file->f_flags & O_ACCMODE) != O_WRONLY) {
|
| 2075 |
|
|
/* might as well read a page, it is fast enough */
|
| 2076 |
|
|
rc = cifs_readpage_worker(file, page, &offset);
|
| 2077 |
|
|
} else {
|
| 2078 |
|
|
/* we could try using another file handle if there is one -
|
| 2079 |
|
|
but how would we lock it to prevent close of that handle
|
| 2080 |
|
|
racing with this read? In any case
|
| 2081 |
|
|
this will be written out by commit_write so is fine */
|
| 2082 |
|
|
}
|
| 2083 |
|
|
|
| 2084 |
|
|
/* we do not need to pass errors back
|
| 2085 |
|
|
e.g. if we do not have read access to the file
|
| 2086 |
|
|
because cifs_commit_write will do the right thing. -- shaggy */
|
| 2087 |
|
|
|
| 2088 |
|
|
return 0;
|
| 2089 |
|
|
}
|
| 2090 |
|
|
|
| 2091 |
|
|
const struct address_space_operations cifs_addr_ops = {
|
| 2092 |
|
|
.readpage = cifs_readpage,
|
| 2093 |
|
|
.readpages = cifs_readpages,
|
| 2094 |
|
|
.writepage = cifs_writepage,
|
| 2095 |
|
|
.writepages = cifs_writepages,
|
| 2096 |
|
|
.prepare_write = cifs_prepare_write,
|
| 2097 |
|
|
.commit_write = cifs_commit_write,
|
| 2098 |
|
|
.set_page_dirty = __set_page_dirty_nobuffers,
|
| 2099 |
|
|
/* .sync_page = cifs_sync_page, */
|
| 2100 |
|
|
/* .direct_IO = */
|
| 2101 |
|
|
};
|
| 2102 |
|
|
|
| 2103 |
|
|
/*
|
| 2104 |
|
|
* cifs_readpages requires the server to support a buffer large enough to
|
| 2105 |
|
|
* contain the header plus one complete page of data. Otherwise, we need
|
| 2106 |
|
|
* to leave cifs_readpages out of the address space operations.
|
| 2107 |
|
|
*/
|
| 2108 |
|
|
const struct address_space_operations cifs_addr_ops_smallbuf = {
|
| 2109 |
|
|
.readpage = cifs_readpage,
|
| 2110 |
|
|
.writepage = cifs_writepage,
|
| 2111 |
|
|
.writepages = cifs_writepages,
|
| 2112 |
|
|
.prepare_write = cifs_prepare_write,
|
| 2113 |
|
|
.commit_write = cifs_commit_write,
|
| 2114 |
|
|
.set_page_dirty = __set_page_dirty_nobuffers,
|
| 2115 |
|
|
/* .sync_page = cifs_sync_page, */
|
| 2116 |
|
|
/* .direct_IO = */
|
| 2117 |
|
|
};
|
