Commit 7ee1af76 authored by Jeremy Allison's avatar Jeremy Allison Committed by Steve French
Browse files

[CIFS] 



Allow Windows blocking locks to be cancelled via a
CANCEL_LOCK call. TODO - restrict this to servers
that support NT_STATUS codes (Win9x will probably
not support this call).

Signed-off-by: default avatarJeremy Allison <jra@samba.org>
Signed-off-by: default avatarSteve French <sfrench@us.ibm.com>
(cherry picked from 570d4d2d895569825d0d017d4e76b51138f68864 commit)
parent 6c3d8909

fs/cifs/cifsglob.h

+9 −6
Original line number Diff line number Diff line
@@ -3,6 +3,7 @@ 
 *

 *   Copyright (C) International Business Machines  Corp., 2002,2006

 *   Author(s): Steve French (sfrench@us.ibm.com)

 *              Jeremy Allison (jra@samba.org)

 *

 *   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
@@ -267,14 +268,14 @@ struct cifsTconInfo { 
};



/*

 * This info hangs off the cifsFileInfo structure.  This is used to track

 * byte stream locks on the file

 * This info hangs off the cifsFileInfo structure, pointed to by llist.

 * This is used to track byte stream locks on the file

 */

struct cifsLockInfo {

	struct cifsLockInfo *next;

	int start;

	int length;

	int type;

	struct list_head llist;	/* pointer to next cifsLockInfo */

	__u64 offset;

	__u64 length;

	__u8 type;

};



/*
@@ -305,6 +306,8 @@ struct cifsFileInfo { 
	/* lock scope id (0 if none) */

	struct file * pfile; /* needed for writepage */

	struct inode * pInode; /* needed for oplock break */

	struct semaphore lock_sem;

	struct list_head llist; /* list of byte range locks we have. */

	unsigned closePend:1;	/* file is marked to close */

	unsigned invalidHandle:1;  /* file closed via session abend */

	atomic_t wrtPending;   /* handle in use - defer close */

fs/cifs/cifsproto.h

+4 −0
Original line number Diff line number Diff line
@@ -50,6 +50,10 @@ extern int SendReceive(const unsigned int /* xid */ , struct cifsSesInfo *, 
extern int SendReceive2(const unsigned int /* xid */ , struct cifsSesInfo *,

			struct kvec *, int /* nvec to send */, 

			int * /* type of buf returned */ , const int long_op);

extern int SendReceiveBlockingLock(const unsigned int /* xid */ , struct cifsTconInfo *,

				struct smb_hdr * /* input */ ,

				struct smb_hdr * /* out */ ,

				int * /* bytes returned */);

extern int checkSMBhdr(struct smb_hdr *smb, __u16 mid);

extern int checkSMB(struct smb_hdr *smb, __u16 mid, int length);

extern int is_valid_oplock_break(struct smb_hdr *smb, struct TCP_Server_Info *);

fs/cifs/cifssmb.c

+13 −2
Original line number Diff line number Diff line
@@ -1460,8 +1460,13 @@ CIFSSMBLock(const int xid, struct cifsTconInfo *tcon, 
	pSMB->hdr.smb_buf_length += count;

	pSMB->ByteCount = cpu_to_le16(count);



	if (waitFlag) {

		rc = SendReceiveBlockingLock(xid, tcon, (struct smb_hdr *) pSMB,

			(struct smb_hdr *) pSMBr, &bytes_returned);

	} else {

		rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,

			 (struct smb_hdr *) pSMBr, &bytes_returned, timeout);

	}

	cifs_stats_inc(&tcon->num_locks);

	if (rc) {

		cFYI(1, ("Send error in Lock = %d", rc));
@@ -1546,8 +1551,14 @@ CIFSSMBPosixLock(const int xid, struct cifsTconInfo *tcon, 
	pSMB->Reserved4 = 0;

	pSMB->hdr.smb_buf_length += byte_count;

	pSMB->ByteCount = cpu_to_le16(byte_count);

	if (waitFlag) {

		rc = SendReceiveBlockingLock(xid, tcon, (struct smb_hdr *) pSMB,

			(struct smb_hdr *) pSMBr, &bytes_returned);

	} else {

		rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,

			(struct smb_hdr *) pSMBr, &bytes_returned, timeout);

	}



	if (rc) {

		cFYI(1, ("Send error in Posix Lock = %d", rc));

	} else if (get_flag) {

fs/cifs/file.c

+80 −15
Original line number Diff line number Diff line
@@ -5,6 +5,7 @@ 
 * 

 *   Copyright (C) International Business Machines  Corp., 2002,2003

 *   Author(s): Steve French (sfrench@us.ibm.com)

 *              Jeremy Allison (jra@samba.org)

 *

 *   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
@@ -47,6 +48,8 @@ static inline struct cifsFileInfo *cifs_init_private( 
	private_data->netfid = netfid;

	private_data->pid = current->tgid;	

	init_MUTEX(&private_data->fh_sem);

	init_MUTEX(&private_data->lock_sem);

	INIT_LIST_HEAD(&private_data->llist);

	private_data->pfile = file; /* needed for writepage */

	private_data->pInode = inode;

	private_data->invalidHandle = FALSE;
@@ -473,6 +476,8 @@ int cifs_close(struct inode *inode, struct file *file) 
	cifs_sb = CIFS_SB(inode->i_sb);

	pTcon = cifs_sb->tcon;

	if (pSMBFile) {

		struct cifsLockInfo *li, *tmp;



		pSMBFile->closePend = TRUE;

		if (pTcon) {

			/* no sense reconnecting to close a file that is
@@ -496,6 +501,16 @@ int cifs_close(struct inode *inode, struct file *file) 
						  pSMBFile->netfid);

			}

		}



		/* 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);



		write_lock(&GlobalSMBSeslock);

		list_del(&pSMBFile->flist);

		list_del(&pSMBFile->tlist);
@@ -570,6 +585,21 @@ int cifs_closedir(struct inode *inode, struct file *file) 
	return rc;

}



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;

}



int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock)

{

	int rc, xid;
@@ -581,6 +611,7 @@ int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock) 
	struct cifsTconInfo *pTcon;

	__u16 netfid;

	__u8 lockType = LOCKING_ANDX_LARGE_FILES;

	int posix_locking;



	length = 1 + pfLock->fl_end - pfLock->fl_start;

	rc = -EACCES;
@@ -639,14 +670,14 @@ int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock) 
	}

	netfid = ((struct cifsFileInfo *)file->private_data)->netfid;



	posix_locking = (cifs_sb->tcon->ses->capabilities & CAP_UNIX) &&

			(CIFS_UNIX_FCNTL_CAP & le64_to_cpu(cifs_sb->tcon->fsUnixInfo.Capability));



	/* BB add code here to normalize offset and length to

	account for negative length which we can not accept over the

	wire */

	if (IS_GETLK(cmd)) {

		if((cifs_sb->tcon->ses->capabilities & CAP_UNIX) &&

		   (CIFS_UNIX_FCNTL_CAP & 

			le64_to_cpu(cifs_sb->tcon->fsUnixInfo.Capability))) {

		if(posix_locking) {

			int posix_lock_type;

			if(lockType & LOCKING_ANDX_SHARED_LOCK)

				posix_lock_type = CIFS_RDLCK;
@@ -682,9 +713,15 @@ int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock) 
		FreeXid(xid);

		return rc;

	}

	if ((cifs_sb->tcon->ses->capabilities & CAP_UNIX) &&

		(CIFS_UNIX_FCNTL_CAP &

			 le64_to_cpu(cifs_sb->tcon->fsUnixInfo.Capability))) {



	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) {

		int posix_lock_type;

		if(lockType & LOCKING_ANDX_SHARED_LOCK)

			posix_lock_type = CIFS_RDLCK;
@@ -693,18 +730,46 @@ int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock) 
		

		if(numUnlock == 1)

			posix_lock_type = CIFS_UNLCK;

		else if(numLock == 0) {

			/* if no lock or unlock then nothing

			to do since we do not know what it is */

			FreeXid(xid);

			return -EOPNOTSUPP;

		}



		rc = CIFSSMBPosixLock(xid, pTcon, netfid, 0 /* set */,

				      length, pfLock,

				      posix_lock_type, wait_flag);

	} else

	} else {

		struct cifsFileInfo *fid = (struct cifsFileInfo *)file->private_data;



		if (numLock) {

			rc = CIFSSMBLock(xid, pTcon, netfid, length, pfLock->fl_start,

				numUnlock, numLock, lockType, wait_flag);

					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;



			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);

				}

			}

		up(&fid->lock_sem);

		}

	}



	if (pfLock->fl_flags & FL_POSIX)

		posix_lock_file_wait(file, pfLock);

	FreeXid(xid);

fs/cifs/netmisc.c

+1 −0
Original line number Diff line number Diff line
@@ -72,6 +72,7 @@ static const struct smb_to_posix_error mapping_table_ERRDOS[] = { 
	{ERRinvlevel,-EOPNOTSUPP},

	{ERRdirnotempty, -ENOTEMPTY},

	{ERRnotlocked, -ENOLCK},

	{ERRcancelviolation, -ENOLCK},

	{ERRalreadyexists, -EEXIST},

	{ERRmoredata, -EOVERFLOW},

	{ERReasnotsupported,-EOPNOTSUPP},

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