file.c 54.3 KB
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/*
 *   fs/cifs/file.c
 *
 *   vfs operations that deal with files
 * 
 *   Copyright (C) International Business Machines  Corp., 2002,2003
 *   Author(s): Steve French (sfrench@us.ibm.com)
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 *              Jeremy Allison (jra@samba.org)
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 *
 *   This library is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Lesser General Public License as published
 *   by the Free Software Foundation; either version 2.1 of the License, or
 *   (at your option) any later version.
 *
 *   This library is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public License
 *   along with this library; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
#include <linux/fs.h>
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#include <linux/backing-dev.h>
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#include <linux/stat.h>
#include <linux/fcntl.h>
#include <linux/pagemap.h>
#include <linux/pagevec.h>
#include <linux/smp_lock.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>
#include "cifsfs.h"
#include "cifspdu.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_unicode.h"
#include "cifs_debug.h"
#include "cifs_fs_sb.h"

static inline struct cifsFileInfo *cifs_init_private(
	struct cifsFileInfo *private_data, struct inode *inode,
	struct file *file, __u16 netfid)
{
	memset(private_data, 0, sizeof(struct cifsFileInfo));
	private_data->netfid = netfid;
	private_data->pid = current->tgid;	
	init_MUTEX(&private_data->fh_sem);
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	init_MUTEX(&private_data->lock_sem);
	INIT_LIST_HEAD(&private_data->llist);
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	private_data->pfile = file; /* needed for writepage */
	private_data->pInode = inode;
	private_data->invalidHandle = FALSE;
	private_data->closePend = FALSE;
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	/* we have to track num writers to the inode, since writepages
	does not tell us which handle the write is for so there can
	be a close (overlapping with write) of the filehandle that
	cifs_writepages chose to use */
	atomic_set(&private_data->wrtPending,0); 
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	return private_data;
}

static inline int cifs_convert_flags(unsigned int flags)
{
	if ((flags & O_ACCMODE) == O_RDONLY)
		return GENERIC_READ;
	else if ((flags & O_ACCMODE) == O_WRONLY)
		return GENERIC_WRITE;
	else if ((flags & O_ACCMODE) == O_RDWR) {
		/* GENERIC_ALL is too much permission to request
		   can cause unnecessary access denied on create */
		/* return GENERIC_ALL; */
		return (GENERIC_READ | GENERIC_WRITE);
	}

	return 0x20197;
}

static inline int cifs_get_disposition(unsigned int flags)
{
	if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
		return FILE_CREATE;
	else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
		return FILE_OVERWRITE_IF;
	else if ((flags & O_CREAT) == O_CREAT)
		return FILE_OPEN_IF;
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	else if ((flags & O_TRUNC) == O_TRUNC)
		return FILE_OVERWRITE;
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	else
		return FILE_OPEN;
}

/* all arguments to this function must be checked for validity in caller */
static inline int cifs_open_inode_helper(struct inode *inode, struct file *file,
	struct cifsInodeInfo *pCifsInode, struct cifsFileInfo *pCifsFile,
	struct cifsTconInfo *pTcon, int *oplock, FILE_ALL_INFO *buf,
	char *full_path, int xid)
{
	struct timespec temp;
	int rc;

	/* want handles we can use to read with first
	   in the list so we do not have to walk the
	   list to search for one in prepare_write */
	if ((file->f_flags & O_ACCMODE) == O_WRONLY) {
		list_add_tail(&pCifsFile->flist, 
			      &pCifsInode->openFileList);
	} else {
		list_add(&pCifsFile->flist,
			 &pCifsInode->openFileList);
	}
	write_unlock(&GlobalSMBSeslock);
	if (pCifsInode->clientCanCacheRead) {
		/* we have the inode open somewhere else
		   no need to discard cache data */
		goto client_can_cache;
	}

	/* BB need same check in cifs_create too? */
	/* if not oplocked, invalidate inode pages if mtime or file
	   size changed */
	temp = cifs_NTtimeToUnix(le64_to_cpu(buf->LastWriteTime));
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	if (timespec_equal(&file->f_path.dentry->d_inode->i_mtime, &temp) &&
			   (file->f_path.dentry->d_inode->i_size ==
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			    (loff_t)le64_to_cpu(buf->EndOfFile))) {
		cFYI(1, ("inode unchanged on server"));
	} 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
		   since namei code should already have it locked? */
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			filemap_write_and_wait(file->f_path.dentry->d_inode->i_mapping);
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		}
		cFYI(1, ("invalidating remote inode since open detected it "
			 "changed"));
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		invalidate_remote_inode(file->f_path.dentry->d_inode);
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	}

client_can_cache:
	if (pTcon->ses->capabilities & CAP_UNIX)
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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);
	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);

	if ((*oplock & 0xF) == OPLOCK_EXCLUSIVE) {
		pCifsInode->clientCanCacheAll = TRUE;
		pCifsInode->clientCanCacheRead = TRUE;
		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)
		pCifsInode->clientCanCacheRead = TRUE;

	return rc;
}

int cifs_open(struct inode *inode, struct file *file)
{
	int rc = -EACCES;
	int xid, oplock;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	struct cifsFileInfo *pCifsFile;
	struct cifsInodeInfo *pCifsInode;
	struct list_head *tmp;
	char *full_path = NULL;
	int desiredAccess;
	int disposition;
	__u16 netfid;
	FILE_ALL_INFO *buf = NULL;

	xid = GetXid();

	cifs_sb = CIFS_SB(inode->i_sb);
	pTcon = cifs_sb->tcon;

	if (file->f_flags & O_CREAT) {
		/* search inode for this file and fill in file->private_data */
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		pCifsInode = CIFS_I(file->f_path.dentry->d_inode);
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		read_lock(&GlobalSMBSeslock);
		list_for_each(tmp, &pCifsInode->openFileList) {
			pCifsFile = list_entry(tmp, struct cifsFileInfo,
					       flist);
			if ((pCifsFile->pfile == NULL) &&
			    (pCifsFile->pid == current->tgid)) {
				/* mode set in cifs_create */

				/* needed for writepage */
				pCifsFile->pfile = file;
				
				file->private_data = pCifsFile;
				break;
			}
		}
		read_unlock(&GlobalSMBSeslock);
		if (file->private_data != NULL) {
			rc = 0;
			FreeXid(xid);
			return rc;
		} else {
			if (file->f_flags & O_EXCL)
				cERROR(1, ("could not find file instance for "
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					   "new file %p", file));
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		}
	}

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	full_path = build_path_from_dentry(file->f_path.dentry);
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	if (full_path == NULL) {
		FreeXid(xid);
		return -ENOMEM;
	}

	cFYI(1, (" inode = 0x%p file flags are 0x%x for %s",
		 inode, file->f_flags, full_path));
	desiredAccess = cifs_convert_flags(file->f_flags);

/*********************************************************************
 *  open flag mapping table:
 *  
 *	POSIX Flag            CIFS Disposition
 *	----------            ---------------- 
 *	O_CREAT               FILE_OPEN_IF
 *	O_CREAT | O_EXCL      FILE_CREATE
 *	O_CREAT | O_TRUNC     FILE_OVERWRITE_IF
 *	O_TRUNC               FILE_OVERWRITE
 *	none of the above     FILE_OPEN
 *
 *	Note that there is not a direct match between disposition
 *	FILE_SUPERSEDE (ie create whether or not file exists although 
 *	O_CREAT | O_TRUNC is similar but truncates the existing
 *	file rather than creating a new file as FILE_SUPERSEDE does
 *	(which uses the attributes / metadata passed in on open call)
 *?
 *?  O_SYNC is a reasonable match to CIFS writethrough flag  
 *?  and the read write flags match reasonably.  O_LARGEFILE
 *?  is irrelevant because largefile support is always used
 *?  by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY,
 *	 O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation
 *********************************************************************/

	disposition = cifs_get_disposition(file->f_flags);

	if (oplockEnabled)
		oplock = REQ_OPLOCK;
	else
		oplock = FALSE;

	/* BB pass O_SYNC flag through on file attributes .. BB */

	/* Also refresh inode by passing in file_info buf returned by SMBOpen
	   and calling get_inode_info with returned buf (at least helps
	   non-Unix server case) */

	/* BB we can not do this if this is the second open of a file 
	   and the first handle has writebehind data, we might be 
	   able to simply do a filemap_fdatawrite/filemap_fdatawait first */
	buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
	if (!buf) {
		rc = -ENOMEM;
		goto out;
	}
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	if (cifs_sb->tcon->ses->capabilities & CAP_NT_SMBS)
		rc = CIFSSMBOpen(xid, pTcon, full_path, disposition, 
			 desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf,
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			 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags
				 & CIFS_MOUNT_MAP_SPECIAL_CHR);
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	else
		rc = -EIO; /* no NT SMB support fall into legacy open below */

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	if (rc == -EIO) {
		/* Old server, try legacy style OpenX */
		rc = SMBLegacyOpen(xid, pTcon, full_path, disposition,
			desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf,
			cifs_sb->local_nls, cifs_sb->mnt_cifs_flags
				& CIFS_MOUNT_MAP_SPECIAL_CHR);
	}
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	if (rc) {
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		cFYI(1, ("cifs_open returned 0x%x", rc));
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		goto out;
	}
	file->private_data =
		kmalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
	if (file->private_data == NULL) {
		rc = -ENOMEM;
		goto out;
	}
	pCifsFile = cifs_init_private(file->private_data, inode, file, netfid);
	write_lock(&GlobalSMBSeslock);
	list_add(&pCifsFile->tlist, &pTcon->openFileList);

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	pCifsInode = CIFS_I(file->f_path.dentry->d_inode);
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	if (pCifsInode) {
		rc = cifs_open_inode_helper(inode, file, pCifsInode,
					    pCifsFile, pTcon,
					    &oplock, buf, full_path, xid);
	} else {
		write_unlock(&GlobalSMBSeslock);
	}

	if (oplock & CIFS_CREATE_ACTION) {           
		/* time to set mode which we can not set earlier due to
		   problems creating new read-only files */
		if (cifs_sb->tcon->ses->capabilities & CAP_UNIX) {
			CIFSSMBUnixSetPerms(xid, pTcon, full_path,
					    inode->i_mode,
					    (__u64)-1, (__u64)-1, 0 /* dev */,
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					    cifs_sb->local_nls,
					    cifs_sb->mnt_cifs_flags & 
						CIFS_MOUNT_MAP_SPECIAL_CHR);
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		} else {
			/* BB implement via Windows security descriptors eg
			   CIFSSMBWinSetPerms(xid, pTcon, full_path, mode,
					      -1, -1, local_nls);
			   in the meantime could set r/o dos attribute when
			   perms are eg: mode & 0222 == 0 */
		}
	}

out:
	kfree(buf);
	kfree(full_path);
	FreeXid(xid);
	return rc;
}

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/* Try to reacquire byte range locks that were released when session */
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/* to server was lost */
static int cifs_relock_file(struct cifsFileInfo *cifsFile)
{
	int rc = 0;

/* BB list all locks open on this file and relock */

	return rc;
}

static int cifs_reopen_file(struct inode *inode, struct file *file, 
	int can_flush)
{
	int rc = -EACCES;
	int xid, oplock;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	struct cifsFileInfo *pCifsFile;
	struct cifsInodeInfo *pCifsInode;
	char *full_path = NULL;
	int desiredAccess;
	int disposition = FILE_OPEN;
	__u16 netfid;

	if (inode == NULL)
		return -EBADF;
	if (file->private_data) {
		pCifsFile = (struct cifsFileInfo *)file->private_data;
	} else
		return -EBADF;

	xid = GetXid();
	down(&pCifsFile->fh_sem);
	if (pCifsFile->invalidHandle == FALSE) {
		up(&pCifsFile->fh_sem);
		FreeXid(xid);
		return 0;
	}

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	if (file->f_path.dentry == NULL) {
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		up(&pCifsFile->fh_sem);
		cFYI(1, ("failed file reopen, no valid name if dentry freed"));
		FreeXid(xid);
		return -EBADF;
	}
	cifs_sb = CIFS_SB(inode->i_sb);
	pTcon = cifs_sb->tcon;
/* can not grab rename sem here because various ops, including
   those that already have the rename sem can end up causing writepage
   to get called and if the server was down that means we end up here,
   and we can never tell if the caller already has the rename_sem */
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	full_path = build_path_from_dentry(file->f_path.dentry);
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	if (full_path == NULL) {
		up(&pCifsFile->fh_sem);
		FreeXid(xid);
		return -ENOMEM;
	}

	cFYI(1, (" inode = 0x%p file flags are 0x%x for %s",
		 inode, file->f_flags,full_path));
	desiredAccess = cifs_convert_flags(file->f_flags);

	if (oplockEnabled)
		oplock = REQ_OPLOCK;
	else
		oplock = FALSE;

	/* Can not refresh inode by passing in file_info buf to be returned
	   by SMBOpen and then calling get_inode_info with returned buf 
	   since file might have write behind data that needs to be flushed 
	   and server version of file size can be stale. If we knew for sure
	   that inode was not dirty locally we could do this */

/*	buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
	if (buf == 0) {
		up(&pCifsFile->fh_sem);
		kfree(full_path);
		FreeXid(xid);
		return -ENOMEM;
	} */
	rc = CIFSSMBOpen(xid, pTcon, full_path, disposition, desiredAccess,
			 CREATE_NOT_DIR, &netfid, &oplock, NULL,
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			 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & 
				CIFS_MOUNT_MAP_SPECIAL_CHR);
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	if (rc) {
		up(&pCifsFile->fh_sem);
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		cFYI(1, ("cifs_open returned 0x%x", rc));
		cFYI(1, ("oplock: %d", oplock));
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	} else {
		pCifsFile->netfid = netfid;
		pCifsFile->invalidHandle = FALSE;
		up(&pCifsFile->fh_sem);
		pCifsInode = CIFS_I(inode);
		if (pCifsInode) {
			if (can_flush) {
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				filemap_write_and_wait(inode->i_mapping);
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			/* temporarily disable caching while we
			   go to server to get inode info */
				pCifsInode->clientCanCacheAll = FALSE;
				pCifsInode->clientCanCacheRead = FALSE;
				if (pTcon->ses->capabilities & CAP_UNIX)
					rc = cifs_get_inode_info_unix(&inode,
						full_path, inode->i_sb, xid);
				else
					rc = cifs_get_inode_info(&inode,
						full_path, NULL, inode->i_sb,
						xid);
			} /* else we are writing out data to server already
			     and could deadlock if we tried to flush data, and
			     since we do not know if we have data that would
			     invalidate the current end of file on the server
			     we can not go to the server to get the new inod
			     info */
			if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) {
				pCifsInode->clientCanCacheAll = TRUE;
				pCifsInode->clientCanCacheRead = TRUE;
				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) {
				pCifsInode->clientCanCacheRead = TRUE;
				pCifsInode->clientCanCacheAll = FALSE;
			} else {
				pCifsInode->clientCanCacheRead = FALSE;
				pCifsInode->clientCanCacheAll = FALSE;
			}
			cifs_relock_file(pCifsFile);
		}
	}

	kfree(full_path);
	FreeXid(xid);
	return rc;
}

int cifs_close(struct inode *inode, struct file *file)
{
	int rc = 0;
	int xid;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	struct cifsFileInfo *pSMBFile =
		(struct cifsFileInfo *)file->private_data;

	xid = GetXid();

	cifs_sb = CIFS_SB(inode->i_sb);
	pTcon = cifs_sb->tcon;
	if (pSMBFile) {
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		struct cifsLockInfo *li, *tmp;

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		pSMBFile->closePend = TRUE;
		if (pTcon) {
			/* no sense reconnecting to close a file that is
			   already closed */
			if (pTcon->tidStatus != CifsNeedReconnect) {
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				int timeout = 2;
				while((atomic_read(&pSMBFile->wrtPending) != 0)
					 && (timeout < 1000) ) {
					/* Give write a better chance to get to
					server ahead of the close.  We do not
					want to add a wait_q here as it would
					increase the memory utilization as
					the struct would be in each open file,
					but this should give enough time to 
					clear the socket */
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#ifdef CONFIG_CIFS_DEBUG2
					cFYI(1,("close delay, write pending"));
#endif /* DEBUG2 */
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					msleep(timeout);
					timeout *= 4;
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				}
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				if(atomic_read(&pSMBFile->wrtPending))
					cERROR(1,("close with pending writes"));
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				rc = CIFSSMBClose(xid, pTcon,
						  pSMBFile->netfid);
			}
		}
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		/* Delete any outstanding lock records.
		   We'll lose them when the file is closed anyway. */
		down(&pSMBFile->lock_sem);
		list_for_each_entry_safe(li, tmp, &pSMBFile->llist, llist) {
			list_del(&li->llist);
			kfree(li);
		}
		up(&pSMBFile->lock_sem);

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		write_lock(&GlobalSMBSeslock);
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		list_del(&pSMBFile->flist);
		list_del(&pSMBFile->tlist);
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		write_unlock(&GlobalSMBSeslock);
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		kfree(pSMBFile->search_resume_name);
		kfree(file->private_data);
		file->private_data = NULL;
	} else
		rc = -EBADF;

	if (list_empty(&(CIFS_I(inode)->openFileList))) {
		cFYI(1, ("closing last open instance for inode %p", inode));
		/* if the file is not open we do not know if we can cache info
		   on this inode, much less write behind and read ahead */
		CIFS_I(inode)->clientCanCacheRead = FALSE;
		CIFS_I(inode)->clientCanCacheAll  = FALSE;
	}
	if ((rc ==0) && CIFS_I(inode)->write_behind_rc)
		rc = CIFS_I(inode)->write_behind_rc;
	FreeXid(xid);
	return rc;
}

int cifs_closedir(struct inode *inode, struct file *file)
{
	int rc = 0;
	int xid;
	struct cifsFileInfo *pCFileStruct =
	    (struct cifsFileInfo *)file->private_data;
	char *ptmp;

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	cFYI(1, ("Closedir inode = 0x%p", inode));
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	xid = GetXid();

	if (pCFileStruct) {
		struct cifsTconInfo *pTcon;
555
		struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
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		pTcon = cifs_sb->tcon;

		cFYI(1, ("Freeing private data in close dir"));
560 561
		if ((pCFileStruct->srch_inf.endOfSearch == FALSE) &&
		   (pCFileStruct->invalidHandle == FALSE)) {
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			pCFileStruct->invalidHandle = TRUE;
			rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid);
			cFYI(1, ("Closing uncompleted readdir with rc %d",
				 rc));
			/* not much we can do if it fails anyway, ignore rc */
			rc = 0;
		}
		ptmp = pCFileStruct->srch_inf.ntwrk_buf_start;
		if (ptmp) {
571
			cFYI(1, ("closedir free smb buf in srch struct"));
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			pCFileStruct->srch_inf.ntwrk_buf_start = NULL;
573 574 575 576
			if(pCFileStruct->srch_inf.smallBuf)
				cifs_small_buf_release(ptmp);
			else
				cifs_buf_release(ptmp);
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		}
		ptmp = pCFileStruct->search_resume_name;
		if (ptmp) {
580
			cFYI(1, ("closedir free resume name"));
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			pCFileStruct->search_resume_name = NULL;
			kfree(ptmp);
		}
		kfree(file->private_data);
		file->private_data = NULL;
	}
	/* BB can we lock the filestruct while this is going on? */
	FreeXid(xid);
	return rc;
}

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static int store_file_lock(struct cifsFileInfo *fid, __u64 len,
				__u64 offset, __u8 lockType)
{
	struct cifsLockInfo *li = kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL);
	if (li == NULL)
		return -ENOMEM;
	li->offset = offset;
	li->length = len;
	li->type = lockType;
	down(&fid->lock_sem);
	list_add(&li->llist, &fid->llist);
	up(&fid->lock_sem);
	return 0;
}

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int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock)
{
	int rc, xid;
	__u32 numLock = 0;
	__u32 numUnlock = 0;
	__u64 length;
	int wait_flag = FALSE;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
616 617
	__u16 netfid;
	__u8 lockType = LOCKING_ANDX_LARGE_FILES;
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	int posix_locking;
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	length = 1 + pfLock->fl_end - pfLock->fl_start;
	rc = -EACCES;
	xid = GetXid();

	cFYI(1, ("Lock parm: 0x%x flockflags: "
		 "0x%x flocktype: 0x%x start: %lld end: %lld",
	        cmd, pfLock->fl_flags, pfLock->fl_type, pfLock->fl_start,
	        pfLock->fl_end));

	if (pfLock->fl_flags & FL_POSIX)
630
		cFYI(1, ("Posix"));
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	if (pfLock->fl_flags & FL_FLOCK)
632
		cFYI(1, ("Flock"));
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	if (pfLock->fl_flags & FL_SLEEP) {
634
		cFYI(1, ("Blocking lock"));
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		wait_flag = TRUE;
	}
	if (pfLock->fl_flags & FL_ACCESS)
		cFYI(1, ("Process suspended by mandatory locking - "
639
			 "not implemented yet"));
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	if (pfLock->fl_flags & FL_LEASE)
		cFYI(1, ("Lease on file - not implemented yet"));
	if (pfLock->fl_flags & 
	    (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE)))
		cFYI(1, ("Unknown lock flags 0x%x", pfLock->fl_flags));

	if (pfLock->fl_type == F_WRLCK) {
		cFYI(1, ("F_WRLCK "));
		numLock = 1;
	} else if (pfLock->fl_type == F_UNLCK) {
650
		cFYI(1, ("F_UNLCK"));
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		numUnlock = 1;
652 653
		/* Check if unlock includes more than
		one lock range */
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	} else if (pfLock->fl_type == F_RDLCK) {
655
		cFYI(1, ("F_RDLCK"));
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		lockType |= LOCKING_ANDX_SHARED_LOCK;
		numLock = 1;
	} else if (pfLock->fl_type == F_EXLCK) {
659
		cFYI(1, ("F_EXLCK"));
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		numLock = 1;
	} else if (pfLock->fl_type == F_SHLCK) {
662
		cFYI(1, ("F_SHLCK"));
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		lockType |= LOCKING_ANDX_SHARED_LOCK;
		numLock = 1;
	} else
666
		cFYI(1, ("Unknown type of lock"));
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668
	cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
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	pTcon = cifs_sb->tcon;

	if (file->private_data == NULL) {
		FreeXid(xid);
		return -EBADF;
	}
675 676
	netfid = ((struct cifsFileInfo *)file->private_data)->netfid;

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	posix_locking = (cifs_sb->tcon->ses->capabilities & CAP_UNIX) &&
			(CIFS_UNIX_FCNTL_CAP & le64_to_cpu(cifs_sb->tcon->fsUnixInfo.Capability));
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680 681 682
	/* BB add code here to normalize offset and length to
	account for negative length which we can not accept over the
	wire */
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	if (IS_GETLK(cmd)) {
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Jeremy Allison 已提交
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		if(posix_locking) {
685 686 687 688 689 690
			int posix_lock_type;
			if(lockType & LOCKING_ANDX_SHARED_LOCK)
				posix_lock_type = CIFS_RDLCK;
			else
				posix_lock_type = CIFS_WRLCK;
			rc = CIFSSMBPosixLock(xid, pTcon, netfid, 1 /* get */,
691
					length,	pfLock,
692 693 694 695 696 697 698 699
					posix_lock_type, wait_flag);
			FreeXid(xid);
			return rc;
		}

		/* BB we could chain these into one lock request BB */
		rc = CIFSSMBLock(xid, pTcon, netfid, length, pfLock->fl_start,
				 0, 1, lockType, 0 /* wait flag */ );
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		if (rc == 0) {
701
			rc = CIFSSMBLock(xid, pTcon, netfid, length, 
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					 pfLock->fl_start, 1 /* numUnlock */ ,
					 0 /* numLock */ , lockType,
					 0 /* wait flag */ );
			pfLock->fl_type = F_UNLCK;
			if (rc != 0)
				cERROR(1, ("Error unlocking previously locked "
708
					   "range %d during test of lock", rc));
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			rc = 0;

		} else {
			/* if rc == ERR_SHARING_VIOLATION ? */
			rc = 0;	/* do not change lock type to unlock
				   since range in use */
		}

		FreeXid(xid);
		return rc;
	}
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	if (!numLock && !numUnlock) {
		/* if no lock or unlock then nothing
		to do since we do not know what it is */
		FreeXid(xid);
		return -EOPNOTSUPP;
	}

	if (posix_locking) {
729 730 731 732 733 734 735
		int posix_lock_type;
		if(lockType & LOCKING_ANDX_SHARED_LOCK)
			posix_lock_type = CIFS_RDLCK;
		else
			posix_lock_type = CIFS_WRLCK;
		
		if(numUnlock == 1)
736
			posix_lock_type = CIFS_UNLCK;
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Jeremy Allison 已提交
737

738
		rc = CIFSSMBPosixLock(xid, pTcon, netfid, 0 /* set */,
739
				      length, pfLock,
740
				      posix_lock_type, wait_flag);
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	} else {
		struct cifsFileInfo *fid = (struct cifsFileInfo *)file->private_data;

		if (numLock) {
			rc = CIFSSMBLock(xid, pTcon, netfid, length, pfLock->fl_start,
					0, numLock, lockType, wait_flag);

			if (rc == 0) {
				/* For Windows locks we must store them. */
				rc = store_file_lock(fid, length,
						pfLock->fl_start, lockType);
			}
		} else if (numUnlock) {
			/* For each stored lock that this unlock overlaps
			   completely, unlock it. */
			int stored_rc = 0;
			struct cifsLockInfo *li, *tmp;

759
			rc = 0;
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			down(&fid->lock_sem);
			list_for_each_entry_safe(li, tmp, &fid->llist, llist) {
				if (pfLock->fl_start <= li->offset &&
						length >= li->length) {
					stored_rc = CIFSSMBLock(xid, pTcon, netfid,
							li->length, li->offset,
							1, 0, li->type, FALSE);
					if (stored_rc)
						rc = stored_rc;

					list_del(&li->llist);
					kfree(li);
				}
			}
774
			up(&fid->lock_sem);
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		}
	}

778
	if (pfLock->fl_flags & FL_POSIX)
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		posix_lock_file_wait(file, pfLock);
	FreeXid(xid);
	return rc;
}

ssize_t cifs_user_write(struct file *file, const char __user *write_data,
	size_t write_size, loff_t *poffset)
{
	int rc = 0;
	unsigned int bytes_written = 0;
	unsigned int total_written;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	int xid, long_op;
	struct cifsFileInfo *open_file;

795
	if (file->f_path.dentry == NULL)
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		return -EBADF;

798
	cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
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	if (cifs_sb == NULL)
		return -EBADF;

	pTcon = cifs_sb->tcon;

	/* cFYI(1,
	   (" write %d bytes to offset %lld of %s", write_size,
806
	   *poffset, file->f_path.dentry->d_name.name)); */
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	if (file->private_data == NULL)
		return -EBADF;
	else
		open_file = (struct cifsFileInfo *) file->private_data;
	
	xid = GetXid();
814
	if (file->f_path.dentry->d_inode == NULL) {
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		FreeXid(xid);
		return -EBADF;
	}

819
	if (*poffset > file->f_path.dentry->d_inode->i_size)
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		long_op = 2; /* writes past end of file can take a long time */
	else
		long_op = 1;

	for (total_written = 0; write_size > total_written;
	     total_written += bytes_written) {
		rc = -EAGAIN;
		while (rc == -EAGAIN) {
			if (file->private_data == NULL) {
				/* file has been closed on us */
				FreeXid(xid);
			/* if we have gotten here we have written some data
			   and blocked, and the file has been freed on us while
			   we blocked so return what we managed to write */
				return total_written;
			} 
			if (open_file->closePend) {
				FreeXid(xid);
				if (total_written)
					return total_written;
				else
					return -EBADF;
			}
			if (open_file->invalidHandle) {
844 845
				if ((file->f_path.dentry == NULL) ||
				    (file->f_path.dentry->d_inode == NULL)) {
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					FreeXid(xid);
					return total_written;
				}
				/* we could deadlock if we called
				   filemap_fdatawait from here so tell
				   reopen_file not to flush data to server
				   now */
853
				rc = cifs_reopen_file(file->f_path.dentry->d_inode,
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					file, FALSE);
				if (rc != 0)
					break;
			}

			rc = CIFSSMBWrite(xid, pTcon,
				open_file->netfid,
				min_t(const int, cifs_sb->wsize,
				      write_size - total_written),
				*poffset, &bytes_written,
				NULL, write_data + total_written, long_op);
		}
		if (rc || (bytes_written == 0)) {
			if (total_written)
				break;
			else {
				FreeXid(xid);
				return rc;
			}
		} else
			*poffset += bytes_written;
		long_op = FALSE; /* subsequent writes fast -
				    15 seconds is plenty */
	}

879
	cifs_stats_bytes_written(pTcon, total_written);
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	/* since the write may have blocked check these pointers again */
882 883 884
	if (file->f_path.dentry) {
		if (file->f_path.dentry->d_inode) {
			struct inode *inode = file->f_path.dentry->d_inode;
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			inode->i_ctime = inode->i_mtime =
				current_fs_time(inode->i_sb);
			if (total_written > 0) {
888 889
				if (*poffset > file->f_path.dentry->d_inode->i_size)
					i_size_write(file->f_path.dentry->d_inode,
L
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					*poffset);
			}
892
			mark_inode_dirty_sync(file->f_path.dentry->d_inode);
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		}
	}
	FreeXid(xid);
	return total_written;
}

static ssize_t cifs_write(struct file *file, const char *write_data,
	size_t write_size, loff_t *poffset)
{
	int rc = 0;
	unsigned int bytes_written = 0;
	unsigned int total_written;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	int xid, long_op;
	struct cifsFileInfo *open_file;

910
	if (file->f_path.dentry == NULL)
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911 912
		return -EBADF;

913
	cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
L
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914 915 916 917 918
	if (cifs_sb == NULL)
		return -EBADF;

	pTcon = cifs_sb->tcon;

S
Steve French 已提交
919
	cFYI(1,("write %zd bytes to offset %lld of %s", write_size,
920
	   *poffset, file->f_path.dentry->d_name.name));
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	if (file->private_data == NULL)
		return -EBADF;
	else
		open_file = (struct cifsFileInfo *)file->private_data;
	
	xid = GetXid();
928
	if (file->f_path.dentry->d_inode == NULL) {
L
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929 930 931 932
		FreeXid(xid);
		return -EBADF;
	}

933
	if (*poffset > file->f_path.dentry->d_inode->i_size)
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		long_op = 2; /* writes past end of file can take a long time */
	else
		long_op = 1;

	for (total_written = 0; write_size > total_written;
	     total_written += bytes_written) {
		rc = -EAGAIN;
		while (rc == -EAGAIN) {
			if (file->private_data == NULL) {
				/* file has been closed on us */
				FreeXid(xid);
			/* if we have gotten here we have written some data
			   and blocked, and the file has been freed on us
			   while we blocked so return what we managed to 
			   write */
				return total_written;
			} 
			if (open_file->closePend) {
				FreeXid(xid);
				if (total_written)
					return total_written;
				else
					return -EBADF;
			}
			if (open_file->invalidHandle) {
959 960
				if ((file->f_path.dentry == NULL) ||
				   (file->f_path.dentry->d_inode == NULL)) {
L
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961 962 963 964 965 966 967
					FreeXid(xid);
					return total_written;
				}
				/* we could deadlock if we called
				   filemap_fdatawait from here so tell
				   reopen_file not to flush data to 
				   server now */
968
				rc = cifs_reopen_file(file->f_path.dentry->d_inode,
L
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969 970 971 972
					file, FALSE);
				if (rc != 0)
					break;
			}
S
Steve French 已提交
973
			if(experimEnabled || (pTcon->ses->server &&
S
Steve French 已提交
974 975
				((pTcon->ses->server->secMode & 
				(SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
S
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976
				== 0))) {
977 978 979
				struct kvec iov[2];
				unsigned int len;

980
				len = min((size_t)cifs_sb->wsize,
981 982 983 984 985
					  write_size - total_written);
				/* iov[0] is reserved for smb header */
				iov[1].iov_base = (char *)write_data +
						  total_written;
				iov[1].iov_len = len;
986
				rc = CIFSSMBWrite2(xid, pTcon,
987
						open_file->netfid, len,
988
						*poffset, &bytes_written,
989
						iov, 1, long_op);
990
			} else
991 992 993 994 995 996 997
				rc = CIFSSMBWrite(xid, pTcon,
					 open_file->netfid,
					 min_t(const int, cifs_sb->wsize,
					       write_size - total_written),
					 *poffset, &bytes_written,
					 write_data + total_written,
					 NULL, long_op);
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		}
		if (rc || (bytes_written == 0)) {
			if (total_written)
				break;
			else {
				FreeXid(xid);
				return rc;
			}
		} else
			*poffset += bytes_written;
		long_op = FALSE; /* subsequent writes fast - 
				    15 seconds is plenty */
	}

1012
	cifs_stats_bytes_written(pTcon, total_written);
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1013 1014

	/* since the write may have blocked check these pointers again */
1015 1016 1017 1018
	if (file->f_path.dentry) {
		if (file->f_path.dentry->d_inode) {
			file->f_path.dentry->d_inode->i_ctime =
			file->f_path.dentry->d_inode->i_mtime = CURRENT_TIME;
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			if (total_written > 0) {
1020 1021
				if (*poffset > file->f_path.dentry->d_inode->i_size)
					i_size_write(file->f_path.dentry->d_inode,
L
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						     *poffset);
			}
1024
			mark_inode_dirty_sync(file->f_path.dentry->d_inode);
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1025 1026 1027 1028 1029 1030
		}
	}
	FreeXid(xid);
	return total_written;
}

1031
struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode)
1032 1033
{
	struct cifsFileInfo *open_file;
1034
	int rc;
1035

1036 1037 1038 1039 1040 1041 1042 1043 1044 1045
	/* Having a null inode here (because mapping->host was set to zero by
	the VFS or MM) should not happen but we had reports of on oops (due to
	it being zero) during stress testcases so we need to check for it */

	if(cifs_inode == NULL) {
		cERROR(1,("Null inode passed to cifs_writeable_file"));
		dump_stack();
		return NULL;
	}

1046 1047 1048 1049 1050 1051 1052
	read_lock(&GlobalSMBSeslock);
	list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
		if (open_file->closePend)
			continue;
		if (open_file->pfile &&
		    ((open_file->pfile->f_flags & O_RDWR) ||
		     (open_file->pfile->f_flags & O_WRONLY))) {
1053
			atomic_inc(&open_file->wrtPending);
1054
			read_unlock(&GlobalSMBSeslock);
1055
			if((open_file->invalidHandle) && 
1056
			   (!open_file->closePend) /* BB fixme -since the second clause can not be true remove it BB */) {
1057
				rc = cifs_reopen_file(&cifs_inode->vfs_inode, 
1058 1059 1060 1061
						      open_file->pfile, FALSE);
				/* if it fails, try another handle - might be */
				/* dangerous to hold up writepages with retry */
				if(rc) {
1062
					cFYI(1,("failed on reopen file in wp"));
1063
					read_lock(&GlobalSMBSeslock);
1064 1065 1066 1067
					/* can not use this handle, no write
					pending on this one after all */
					atomic_dec
					     (&open_file->wrtPending);
1068 1069 1070
					continue;
				}
			}
1071 1072 1073 1074 1075 1076 1077
			return open_file;
		}
	}
	read_unlock(&GlobalSMBSeslock);
	return NULL;
}

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static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to)
{
	struct address_space *mapping = page->mapping;
	loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
	char *write_data;
	int rc = -EFAULT;
	int bytes_written = 0;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	struct inode *inode;
1088
	struct cifsFileInfo *open_file;
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	if (!mapping || !mapping->host)
		return -EFAULT;

	inode = page->mapping->host;
	cifs_sb = CIFS_SB(inode->i_sb);
	pTcon = cifs_sb->tcon;

	offset += (loff_t)from;
	write_data = kmap(page);
	write_data += from;

	if ((to > PAGE_CACHE_SIZE) || (from > to)) {
		kunmap(page);
		return -EIO;
	}

	/* racing with truncate? */
	if (offset > mapping->host->i_size) {
		kunmap(page);
		return 0; /* don't care */
	}

	/* check to make sure that we are not extending the file */
	if (mapping->host->i_size - offset < (loff_t)to)
		to = (unsigned)(mapping->host->i_size - offset); 

1116 1117 1118 1119
	open_file = find_writable_file(CIFS_I(mapping->host));
	if (open_file) {
		bytes_written = cifs_write(open_file->pfile, write_data,
					   to-from, &offset);
1120
		atomic_dec(&open_file->wrtPending);
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		/* Does mm or vfs already set times? */
1122 1123 1124 1125 1126 1127
		inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb);
		if ((bytes_written > 0) && (offset)) {
			rc = 0;
		} else if (bytes_written < 0) {
			if (rc != -EBADF)
				rc = bytes_written;
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		}
1129
	} else {
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		cFYI(1, ("No writeable filehandles for inode"));
		rc = -EIO;
	}

	kunmap(page);
	return rc;
}

static int cifs_writepages(struct address_space *mapping,
1139
			   struct writeback_control *wbc)
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{
1141 1142 1143 1144 1145
	struct backing_dev_info *bdi = mapping->backing_dev_info;
	unsigned int bytes_to_write;
	unsigned int bytes_written;
	struct cifs_sb_info *cifs_sb;
	int done = 0;
1146
	pgoff_t end;
1147
	pgoff_t index;
1148
 	int range_whole = 0;
1149
	struct kvec iov[32];
1150
	int len;
1151 1152 1153 1154
	int n_iov = 0;
	pgoff_t next;
	int nr_pages;
	__u64 offset = 0;
1155
	struct cifsFileInfo *open_file;
1156 1157 1158 1159
	struct page *page;
	struct pagevec pvec;
	int rc = 0;
	int scanned = 0;
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	int xid;

1162 1163 1164 1165 1166 1167 1168 1169 1170
	cifs_sb = CIFS_SB(mapping->host->i_sb);
	
	/*
	 * If wsize is smaller that the page cache size, default to writing
	 * one page at a time via cifs_writepage
	 */
	if (cifs_sb->wsize < PAGE_CACHE_SIZE)
		return generic_writepages(mapping, wbc);

1171 1172 1173
	if((cifs_sb->tcon->ses) && (cifs_sb->tcon->ses->server))
		if(cifs_sb->tcon->ses->server->secMode &
                          (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
1174 1175
			if(!experimEnabled)
				return generic_writepages(mapping, wbc);
1176

1177 1178 1179 1180 1181 1182 1183 1184 1185
	/*
	 * BB: Is this meaningful for a non-block-device file system?
	 * If it is, we should test it again after we do I/O
	 */
	if (wbc->nonblocking && bdi_write_congested(bdi)) {
		wbc->encountered_congestion = 1;
		return 0;
	}

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	xid = GetXid();

1188
	pagevec_init(&pvec, 0);
1189
	if (wbc->range_cyclic) {
1190
		index = mapping->writeback_index; /* Start from prev offset */
1191 1192 1193 1194 1195 1196
		end = -1;
	} else {
		index = wbc->range_start >> PAGE_CACHE_SHIFT;
		end = wbc->range_end >> PAGE_CACHE_SHIFT;
		if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
			range_whole = 1;
1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231
		scanned = 1;
	}
retry:
	while (!done && (index <= end) &&
	       (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
			PAGECACHE_TAG_DIRTY,
			min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1))) {
		int first;
		unsigned int i;

		first = -1;
		next = 0;
		n_iov = 0;
		bytes_to_write = 0;

		for (i = 0; i < nr_pages; i++) {
			page = pvec.pages[i];
			/*
			 * At this point we hold neither mapping->tree_lock nor
			 * lock on the page itself: the page may be truncated or
			 * invalidated (changing page->mapping to NULL), or even
			 * swizzled back from swapper_space to tmpfs file
			 * mapping
			 */

			if (first < 0)
				lock_page(page);
			else if (TestSetPageLocked(page))
				break;

			if (unlikely(page->mapping != mapping)) {
				unlock_page(page);
				break;
			}

1232
			if (!wbc->range_cyclic && page->index > end) {
1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251
				done = 1;
				unlock_page(page);
				break;
			}

			if (next && (page->index != next)) {
				/* Not next consecutive page */
				unlock_page(page);
				break;
			}

			if (wbc->sync_mode != WB_SYNC_NONE)
				wait_on_page_writeback(page);

			if (PageWriteback(page) ||
					!test_clear_page_dirty(page)) {
				unlock_page(page);
				break;
			}
1252 1253 1254 1255 1256 1257 1258

			if (page_offset(page) >= mapping->host->i_size) {
				done = 1;
				unlock_page(page);
				break;
			}

1259 1260 1261 1262 1263
			/*
			 * BB can we get rid of this?  pages are held by pvec
			 */
			page_cache_get(page);

1264 1265 1266
			len = min(mapping->host->i_size - page_offset(page),
				  (loff_t)PAGE_CACHE_SIZE);

1267 1268 1269
			/* reserve iov[0] for the smb header */
			n_iov++;
			iov[n_iov].iov_base = kmap(page);
1270 1271
			iov[n_iov].iov_len = len;
			bytes_to_write += len;
1272 1273 1274 1275 1276 1277 1278 1279 1280 1281

			if (first < 0) {
				first = i;
				offset = page_offset(page);
			}
			next = page->index + 1;
			if (bytes_to_write + PAGE_CACHE_SIZE > cifs_sb->wsize)
				break;
		}
		if (n_iov) {
1282 1283 1284 1285 1286 1287 1288 1289
			/* Search for a writable handle every time we call
			 * CIFSSMBWrite2.  We can't rely on the last handle
			 * we used to still be valid
			 */
			open_file = find_writable_file(CIFS_I(mapping->host));
			if (!open_file) {
				cERROR(1, ("No writable handles for inode"));
				rc = -EBADF;
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			} else {
1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306
				rc = CIFSSMBWrite2(xid, cifs_sb->tcon,
						   open_file->netfid,
						   bytes_to_write, offset,
						   &bytes_written, iov, n_iov,
						   1);
				atomic_dec(&open_file->wrtPending);
				if (rc || bytes_written < bytes_to_write) {
					cERROR(1,("Write2 ret %d, written = %d",
						  rc, bytes_written));
					/* BB what if continued retry is
					   requested via mount flags? */
					set_bit(AS_EIO, &mapping->flags);
				} else {
					cifs_stats_bytes_written(cifs_sb->tcon,
								 bytes_written);
				}
1307 1308 1309
			}
			for (i = 0; i < n_iov; i++) {
				page = pvec.pages[first + i];
1310 1311 1312 1313 1314 1315 1316
				/* Should we also set page error on
				success rc but too little data written? */
				/* BB investigate retry logic on temporary
				server crash cases and how recovery works
				when page marked as error */ 
				if(rc)
					SetPageError(page);
1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335
				kunmap(page);
				unlock_page(page);
				page_cache_release(page);
			}
			if ((wbc->nr_to_write -= n_iov) <= 0)
				done = 1;
			index = next;
		}
		pagevec_release(&pvec);
	}
	if (!scanned && !done) {
		/*
		 * We hit the last page and there is more work to be done: wrap
		 * back to the start of the file
		 */
		scanned = 1;
		index = 0;
		goto retry;
	}
1336
	if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
1337 1338
		mapping->writeback_index = index;

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	FreeXid(xid);
1340

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	return rc;
}

static int cifs_writepage(struct page* page, struct writeback_control *wbc)
{
	int rc = -EFAULT;
	int xid;

	xid = GetXid();
/* BB add check for wbc flags */
	page_cache_get(page);
        if (!PageUptodate(page)) {
		cFYI(1, ("ppw - page not up to date"));
	}
	
	rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE);
	SetPageUptodate(page); /* BB add check for error and Clearuptodate? */
	unlock_page(page);
	page_cache_release(page);	
	FreeXid(xid);
	return rc;
}

static int cifs_commit_write(struct file *file, struct page *page,
	unsigned offset, unsigned to)
{
	int xid;
	int rc = 0;
	struct inode *inode = page->mapping->host;
	loff_t position = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to;
	char *page_data;

	xid = GetXid();
	cFYI(1, ("commit write for page %p up to position %lld for %d", 
		 page, position, to));
	if (position > inode->i_size) {
		i_size_write(inode, position);
		/* if (file->private_data == NULL) {
			rc = -EBADF;
		} else {
			open_file = (struct cifsFileInfo *)file->private_data;
			cifs_sb = CIFS_SB(inode->i_sb);
			rc = -EAGAIN;
			while (rc == -EAGAIN) {
				if ((open_file->invalidHandle) && 
				    (!open_file->closePend)) {
					rc = cifs_reopen_file(
1388
						file->f_path.dentry->d_inode, file);
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					if (rc != 0)
						break;
				}
				if (!open_file->closePend) {
					rc = CIFSSMBSetFileSize(xid,
						cifs_sb->tcon, position,
						open_file->netfid,
						open_file->pid, FALSE);
				} else {
					rc = -EBADF;
					break;
				}
			}
			cFYI(1, (" SetEOF (commit write) rc = %d", rc));
		} */
	}
	if (!PageUptodate(page)) {
		position =  ((loff_t)page->index << PAGE_CACHE_SHIFT) + offset;
		/* can not rely on (or let) writepage write this data */
		if (to < offset) {
			cFYI(1, ("Illegal offsets, can not copy from %d to %d",
				offset, to));
			FreeXid(xid);
			return rc;
		}
		/* this is probably better than directly calling
		   partialpage_write since in this function the file handle is
		   known which we might as well	leverage */
		/* BB check if anything else missing out of ppw
		   such as updating last write time */
		page_data = kmap(page);
		rc = cifs_write(file, page_data + offset, to-offset,
				&position);
		if (rc > 0)
			rc = 0;
		/* else if (rc < 0) should we set writebehind rc? */
		kunmap(page);
	} else {	
		set_page_dirty(page);
	}

	FreeXid(xid);
	return rc;
}

int cifs_fsync(struct file *file, struct dentry *dentry, int datasync)
{
	int xid;
	int rc = 0;
1438
	struct inode *inode = file->f_path.dentry->d_inode;
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	xid = GetXid();

1442
	cFYI(1, ("Sync file - name: %s datasync: 0x%x", 
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		dentry->d_name.name, datasync));
	
	rc = filemap_fdatawrite(inode->i_mapping);
	if (rc == 0)
		CIFS_I(inode)->write_behind_rc = 0;
	FreeXid(xid);
	return rc;
}

1452
/* static void cifs_sync_page(struct page *page)
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{
	struct address_space *mapping;
	struct inode *inode;
	unsigned long index = page->index;
	unsigned int rpages = 0;
	int rc = 0;

	cFYI(1, ("sync page %p",page));
	mapping = page->mapping;
	if (!mapping)
		return 0;
	inode = mapping->host;
	if (!inode)
1466
		return; */
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/*	fill in rpages then 
	result = cifs_pagein_inode(inode, index, rpages); */ /* BB finish */

1471
/*	cFYI(1, ("rpages is %d for sync page of Index %ld", rpages, index));
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1473
#if 0
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	if (rc < 0)
		return rc;
	return 0;
1477
#endif
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} */

/*
 * As file closes, flush all cached write data for this inode checking
 * for write behind errors.
 */
1484
int cifs_flush(struct file *file, fl_owner_t id)
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{
1486
	struct inode * inode = file->f_path.dentry->d_inode;
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	int rc = 0;

	/* Rather than do the steps manually:
	   lock the inode for writing
	   loop through pages looking for write behind data (dirty pages)
	   coalesce into contiguous 16K (or smaller) chunks to write to server
	   send to server (prefer in parallel)
	   deal with writebehind errors
	   unlock inode for writing
	   filemapfdatawrite appears easier for the time being */

	rc = filemap_fdatawrite(inode->i_mapping);
	if (!rc) /* reset wb rc if we were able to write out dirty pages */
		CIFS_I(inode)->write_behind_rc = 0;
		
	cFYI(1, ("Flush inode %p file %p rc %d",inode,file,rc));

	return rc;
}

ssize_t cifs_user_read(struct file *file, char __user *read_data,
	size_t read_size, loff_t *poffset)
{
	int rc = -EACCES;
	unsigned int bytes_read = 0;
	unsigned int total_read = 0;
	unsigned int current_read_size;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	int xid;
	struct cifsFileInfo *open_file;
	char *smb_read_data;
	char __user *current_offset;
	struct smb_com_read_rsp *pSMBr;

	xid = GetXid();
1523
	cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
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	pTcon = cifs_sb->tcon;

	if (file->private_data == NULL) {
		FreeXid(xid);
		return -EBADF;
	}
	open_file = (struct cifsFileInfo *)file->private_data;

	if ((file->f_flags & O_ACCMODE) == O_WRONLY) {
		cFYI(1, ("attempting read on write only file instance"));
	}
	for (total_read = 0, current_offset = read_data;
	     read_size > total_read;
	     total_read += bytes_read, current_offset += bytes_read) {
		current_read_size = min_t(const int, read_size - total_read, 
					  cifs_sb->rsize);
		rc = -EAGAIN;
		smb_read_data = NULL;
		while (rc == -EAGAIN) {
1543
			int buf_type = CIFS_NO_BUFFER;
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			if ((open_file->invalidHandle) && 
			    (!open_file->closePend)) {
1546
				rc = cifs_reopen_file(file->f_path.dentry->d_inode,
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					file, TRUE);
				if (rc != 0)
					break;
			}
1551
			rc = CIFSSMBRead(xid, pTcon,
1552 1553 1554 1555
					 open_file->netfid,
					 current_read_size, *poffset,
					 &bytes_read, &smb_read_data,
					 &buf_type);
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			pSMBr = (struct smb_com_read_rsp *)smb_read_data;
			if (smb_read_data) {
1558 1559 1560 1561 1562 1563 1564 1565
				if (copy_to_user(current_offset,
						smb_read_data +
						4 /* RFC1001 length field */ +
						le16_to_cpu(pSMBr->DataOffset),
						bytes_read)) {
					rc = -EFAULT;
				}

1566 1567 1568 1569
				if(buf_type == CIFS_SMALL_BUFFER)
					cifs_small_buf_release(smb_read_data);
				else if(buf_type == CIFS_LARGE_BUFFER)
					cifs_buf_release(smb_read_data);
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				smb_read_data = NULL;
			}
		}
		if (rc || (bytes_read == 0)) {
			if (total_read) {
				break;
			} else {
				FreeXid(xid);
				return rc;
			}
		} else {
1581
			cifs_stats_bytes_read(pTcon, bytes_read);
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			*poffset += bytes_read;
		}
	}
	FreeXid(xid);
	return total_read;
}


static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size,
	loff_t *poffset)
{
	int rc = -EACCES;
	unsigned int bytes_read = 0;
	unsigned int total_read;
	unsigned int current_read_size;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	int xid;
	char *current_offset;
	struct cifsFileInfo *open_file;
1602
	int buf_type = CIFS_NO_BUFFER;
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	xid = GetXid();
1605
	cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
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	pTcon = cifs_sb->tcon;

	if (file->private_data == NULL) {
		FreeXid(xid);
		return -EBADF;
	}
	open_file = (struct cifsFileInfo *)file->private_data;

	if ((file->f_flags & O_ACCMODE) == O_WRONLY)
		cFYI(1, ("attempting read on write only file instance"));

	for (total_read = 0, current_offset = read_data; 
	     read_size > total_read;
	     total_read += bytes_read, current_offset += bytes_read) {
		current_read_size = min_t(const int, read_size - total_read,
					  cifs_sb->rsize);
1622 1623 1624 1625 1626 1627 1628
		/* For windows me and 9x we do not want to request more
		than it negotiated since it will refuse the read then */
		if((pTcon->ses) && 
			!(pTcon->ses->capabilities & CAP_LARGE_FILES)) {
			current_read_size = min_t(const int, current_read_size,
					pTcon->ses->server->maxBuf - 128);
		}
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		rc = -EAGAIN;
		while (rc == -EAGAIN) {
			if ((open_file->invalidHandle) && 
			    (!open_file->closePend)) {
1633
				rc = cifs_reopen_file(file->f_path.dentry->d_inode,
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					file, TRUE);
				if (rc != 0)
					break;
			}
1638
			rc = CIFSSMBRead(xid, pTcon,
1639 1640 1641 1642
					 open_file->netfid,
					 current_read_size, *poffset,
					 &bytes_read, &current_offset,
					 &buf_type);
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		}
		if (rc || (bytes_read == 0)) {
			if (total_read) {
				break;
			} else {
				FreeXid(xid);
				return rc;
			}
		} else {
1652
			cifs_stats_bytes_read(pTcon, total_read);
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			*poffset += bytes_read;
		}
	}
	FreeXid(xid);
	return total_read;
}

int cifs_file_mmap(struct file *file, struct vm_area_struct *vma)
{
1662
	struct dentry *dentry = file->f_path.dentry;
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	int rc, xid;

	xid = GetXid();
	rc = cifs_revalidate(dentry);
	if (rc) {
		cFYI(1, ("Validation prior to mmap failed, error=%d", rc));
		FreeXid(xid);
		return rc;
	}
	rc = generic_file_mmap(file, vma);
	FreeXid(xid);
	return rc;
}


static void cifs_copy_cache_pages(struct address_space *mapping, 
	struct list_head *pages, int bytes_read, char *data,
	struct pagevec *plru_pvec)
{
	struct page *page;
	char *target;

	while (bytes_read > 0) {
		if (list_empty(pages))
			break;

		page = list_entry(pages->prev, struct page, lru);
		list_del(&page->lru);

		if (add_to_page_cache(page, mapping, page->index,
				      GFP_KERNEL)) {
			page_cache_release(page);
			cFYI(1, ("Add page cache failed"));
1696 1697
			data += PAGE_CACHE_SIZE;
			bytes_read -= PAGE_CACHE_SIZE;
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			continue;
		}

		target = kmap_atomic(page,KM_USER0);

		if (PAGE_CACHE_SIZE > bytes_read) {
			memcpy(target, data, bytes_read);
			/* zero the tail end of this partial page */
			memset(target + bytes_read, 0, 
			       PAGE_CACHE_SIZE - bytes_read);
			bytes_read = 0;
		} else {
			memcpy(target, data, PAGE_CACHE_SIZE);
			bytes_read -= PAGE_CACHE_SIZE;
		}
		kunmap_atomic(target, KM_USER0);

		flush_dcache_page(page);
		SetPageUptodate(page);
		unlock_page(page);
		if (!pagevec_add(plru_pvec, page))
			__pagevec_lru_add(plru_pvec);
		data += PAGE_CACHE_SIZE;
	}
	return;
}

static int cifs_readpages(struct file *file, struct address_space *mapping,
	struct list_head *page_list, unsigned num_pages)
{
	int rc = -EACCES;
	int xid;
	loff_t offset;
	struct page *page;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	int bytes_read = 0;
	unsigned int read_size,i;
	char *smb_read_data = NULL;
	struct smb_com_read_rsp *pSMBr;
	struct pagevec lru_pvec;
	struct cifsFileInfo *open_file;
1740
	int buf_type = CIFS_NO_BUFFER;
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	xid = GetXid();
	if (file->private_data == NULL) {
		FreeXid(xid);
		return -EBADF;
	}
	open_file = (struct cifsFileInfo *)file->private_data;
1748
	cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
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	pTcon = cifs_sb->tcon;
1750

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	pagevec_init(&lru_pvec, 0);

	for (i = 0; i < num_pages; ) {
		unsigned contig_pages;
		struct page *tmp_page;
		unsigned long expected_index;

		if (list_empty(page_list))
			break;

		page = list_entry(page_list->prev, struct page, lru);
		offset = (loff_t)page->index << PAGE_CACHE_SHIFT;

		/* count adjacent pages that we will read into */
		contig_pages = 0;
		expected_index = 
			list_entry(page_list->prev, struct page, lru)->index;
		list_for_each_entry_reverse(tmp_page,page_list,lru) {
			if (tmp_page->index == expected_index) {
				contig_pages++;
				expected_index++;
			} else
				break; 
		}
		if (contig_pages + i >  num_pages)
			contig_pages = num_pages - i;

		/* for reads over a certain size could initiate async
		   read ahead */

		read_size = contig_pages * PAGE_CACHE_SIZE;
		/* Read size needs to be in multiples of one page */
		read_size = min_t(const unsigned int, read_size,
				  cifs_sb->rsize & PAGE_CACHE_MASK);

		rc = -EAGAIN;
		while (rc == -EAGAIN) {
			if ((open_file->invalidHandle) && 
			    (!open_file->closePend)) {
1790
				rc = cifs_reopen_file(file->f_path.dentry->d_inode,
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					file, TRUE);
				if (rc != 0)
					break;
			}

1796
			rc = CIFSSMBRead(xid, pTcon,
1797 1798 1799 1800
					 open_file->netfid,
					 read_size, offset,
					 &bytes_read, &smb_read_data,
					 &buf_type);
1801
			/* BB more RC checks ? */
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			if (rc== -EAGAIN) {
				if (smb_read_data) {
1804 1805 1806 1807
					if(buf_type == CIFS_SMALL_BUFFER)
						cifs_small_buf_release(smb_read_data);
					else if(buf_type == CIFS_LARGE_BUFFER)
						cifs_buf_release(smb_read_data);
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					smb_read_data = NULL;
				}
			}
		}
		if ((rc < 0) || (smb_read_data == NULL)) {
			cFYI(1, ("Read error in readpages: %d", rc));
			break;
		} else if (bytes_read > 0) {
1816
			task_io_account_read(bytes_read);
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			pSMBr = (struct smb_com_read_rsp *)smb_read_data;
			cifs_copy_cache_pages(mapping, page_list, bytes_read,
				smb_read_data + 4 /* RFC1001 hdr */ +
				le16_to_cpu(pSMBr->DataOffset), &lru_pvec);

			i +=  bytes_read >> PAGE_CACHE_SHIFT;
1823
			cifs_stats_bytes_read(pTcon, bytes_read);
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			if ((int)(bytes_read & PAGE_CACHE_MASK) != bytes_read) {
				i++; /* account for partial page */

				/* server copy of file can have smaller size 
				   than client */
				/* BB do we need to verify this common case ? 
				   this case is ok - if we are at server EOF 
				   we will hit it on next read */

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				/* break; */
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			}
		} else {
			cFYI(1, ("No bytes read (%d) at offset %lld . "
				 "Cleaning remaining pages from readahead list",
				 bytes_read, offset));
			/* BB turn off caching and do new lookup on 
			   file size at server? */
			break;
		}
		if (smb_read_data) {
1844 1845 1846 1847
			if(buf_type == CIFS_SMALL_BUFFER)
				cifs_small_buf_release(smb_read_data);
			else if(buf_type == CIFS_LARGE_BUFFER)
				cifs_buf_release(smb_read_data);
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			smb_read_data = NULL;
		}
		bytes_read = 0;
	}

	pagevec_lru_add(&lru_pvec);

/* need to free smb_read_data buf before exit */
	if (smb_read_data) {
1857 1858 1859 1860
		if(buf_type == CIFS_SMALL_BUFFER)
			cifs_small_buf_release(smb_read_data);
		else if(buf_type == CIFS_LARGE_BUFFER)
			cifs_buf_release(smb_read_data);
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		smb_read_data = NULL;
	} 

	FreeXid(xid);
	return rc;
}

static int cifs_readpage_worker(struct file *file, struct page *page,
	loff_t *poffset)
{
	char *read_data;
	int rc;

	page_cache_get(page);
	read_data = kmap(page);
	/* for reads over a certain size could initiate async read ahead */
                                                                                                                           
	rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset);
                                                                                                                           
	if (rc < 0)
		goto io_error;
	else
1883
		cFYI(1, ("Bytes read %d",rc));
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1885 1886
	file->f_path.dentry->d_inode->i_atime =
		current_fs_time(file->f_path.dentry->d_inode->i_sb);
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	if (PAGE_CACHE_SIZE > rc)
		memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc);

	flush_dcache_page(page);
	SetPageUptodate(page);
	rc = 0;
                                                                                                                           
io_error:
        kunmap(page);
	page_cache_release(page);
	return rc;
}

static int cifs_readpage(struct file *file, struct page *page)
{
	loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
	int rc = -EACCES;
	int xid;

	xid = GetXid();

	if (file->private_data == NULL) {
		FreeXid(xid);
		return -EBADF;
	}

	cFYI(1, ("readpage %p at offset %d 0x%x\n", 
		 page, (int)offset, (int)offset));

	rc = cifs_readpage_worker(file, page, &offset);

	unlock_page(page);

	FreeXid(xid);
	return rc;
}

/* We do not want to update the file size from server for inodes
   open for write - to avoid races with writepage extending
   the file - in the future we could consider allowing
   refreshing the inode only on increases in the file size 
   but this is tricky to do without racing with writebehind
   page caching in the current Linux kernel design */
int is_size_safe_to_change(struct cifsInodeInfo *cifsInode)
{
1933 1934 1935 1936 1937 1938
	struct cifsFileInfo *open_file = NULL;

	if (cifsInode)
		open_file =  find_writable_file(cifsInode);
 
	if(open_file) {
1939 1940
		struct cifs_sb_info *cifs_sb;

1941 1942 1943 1944
		/* there is not actually a write pending so let
		this handle go free and allow it to
		be closable if needed */
		atomic_dec(&open_file->wrtPending);
1945 1946 1947 1948 1949 1950 1951 1952

		cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb);
		if ( cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO ) {
			/* since no page cache to corrupt on directio 
			we can change size safely */
			return 1;
		}

1953
		return 0;
1954
	} else
1955
		return 1;
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}

static int cifs_prepare_write(struct file *file, struct page *page,
	unsigned from, unsigned to)
{
	int rc = 0;
        loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
	cFYI(1, ("prepare write for page %p from %d to %d",page,from,to));
	if (!PageUptodate(page)) {
	/*	if (to - from != PAGE_CACHE_SIZE) {
			void *kaddr = kmap_atomic(page, KM_USER0);
			memset(kaddr, 0, from);
			memset(kaddr + to, 0, PAGE_CACHE_SIZE - to);
			flush_dcache_page(page);
			kunmap_atomic(kaddr, KM_USER0);
		} */
		/* If we are writing a full page it will be up to date,
		   no need to read from the server */
		if ((to == PAGE_CACHE_SIZE) && (from == 0))
			SetPageUptodate(page);

		/* might as well read a page, it is fast enough */
		if ((file->f_flags & O_ACCMODE) != O_WRONLY) {
			rc = cifs_readpage_worker(file, page, &offset);
		} else {
		/* should we try using another file handle if there is one -
		   how would we lock it to prevent close of that handle
		   racing with this read?
		   In any case this will be written out by commit_write */
		}
	}

	/* BB should we pass any errors back? 
	   e.g. if we do not have read access to the file */
	return 0;
}

1993
const struct address_space_operations cifs_addr_ops = {
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	.readpage = cifs_readpage,
	.readpages = cifs_readpages,
	.writepage = cifs_writepage,
1997
	.writepages = cifs_writepages,
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	.prepare_write = cifs_prepare_write,
	.commit_write = cifs_commit_write,
	.set_page_dirty = __set_page_dirty_nobuffers,
	/* .sync_page = cifs_sync_page, */
	/* .direct_IO = */
};
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/*
 * cifs_readpages requires the server to support a buffer large enough to
 * contain the header plus one complete page of data.  Otherwise, we need
 * to leave cifs_readpages out of the address space operations.
 */
2010
const struct address_space_operations cifs_addr_ops_smallbuf = {
D
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2011 2012 2013 2014 2015 2016 2017 2018 2019
	.readpage = cifs_readpage,
	.writepage = cifs_writepage,
	.writepages = cifs_writepages,
	.prepare_write = cifs_prepare_write,
	.commit_write = cifs_commit_write,
	.set_page_dirty = __set_page_dirty_nobuffers,
	/* .sync_page = cifs_sync_page, */
	/* .direct_IO = */
};