centos52: revert POSIX locks behavior during close using storage_lock

sources/centos52/Makefile

@@ -3,4 +3,4 @@
 #
 obj-$(CONFIG_CIFS) += etercifs.o
 
-etercifs-objs := cifsfs.o cifssmb.o cifs_debug.o connect.o dir.o file.o inode.o link.o misc.o netmisc.o smbdes.o smbencrypt.o transport.o asn1.o md4.o md5.o cifs_unicode.o nterr.o xattr.o cifsencrypt.o fcntl.o readdir.o ioctl.o sess.o export.o cifs_lock_storage.o
+etercifs-objs := cifsfs.o cifssmb.o cifs_debug.o connect.o dir.o file.o inode.o link.o misc.o netmisc.o smbdes.o smbencrypt.o transport.o asn1.o md4.o md5.o cifs_unicode.o nterr.o xattr.o cifsencrypt.o fcntl.o readdir.o ioctl.o sess.o export.o

sources/centos52/cifs_lock_storage.c

-/*
- *   fs/cifs/cifs_lock_storage.c
- *
- *   lock tree operations that provide posix behaviour on windows server
- *
- *   Author(s): Pavel Shilovsky (piastryyy@gmail.com), Copyright (C) 2009.
- *
- *   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/ctype.h>
-#include <linux/kthread.h>
-#include <linux/random.h>
-#include "cifspdu.h"
-#include "cifsglob.h"
-#include "cifsproto.h"
-#include "cifs_unicode.h"
-#include "cifs_debug.h"
-#include "cifs_fs_sb.h"
-#include "cifs_lock_storage.h"
-
-struct cifsPidTreeLock {
-	struct list_head lock_list;
-	__u8 type;
-	__u64 offset;
-	__u64 len;
-	__u16 fid;
-	unsigned long inodeId;
-};
-
-struct cifsPidTree {
-	struct cifsPidTree *left, *right;
-	__u64 priority;
-	__u32 pid;
-	struct list_head lock_list;
-};
-
-static struct cifsPidTree *LOCK_STORAGE;
-static struct mutex storage_mutex;
-
-static __u32 cifsRandStart;
-
-static __u32 cifs_random(void)
-{
-	return cifsRandStart = (8253729 * cifsRandStart + 2396403);
-}
-
-void cifs_lock_storage_init(void)
-{
-	mutex_init(&storage_mutex);
-	LOCK_STORAGE = NULL;
-	cifsRandStart = jiffies;
-}
-
-static int vertex_init(struct cifsPidTree **root, __u32 pid)
-{
-	(*root) = kmalloc(sizeof(struct cifsPidTree), GFP_KERNEL);
-	if ((*root) == NULL) {
-		return -ENOMEM;
-	}
-	(*root)->pid = pid;
-	(*root)->left = (*root)->right = NULL;
-	(*root)->priority = ((cifs_random() << 16) ^ cifs_random());
-	INIT_LIST_HEAD(&(*root)->lock_list);
-	return 0;
-}
-
-static void cifs_pid_tree_split(struct cifsPidTree *root, struct cifsPidTree **left, struct cifsPidTree **right, __u32 pid)
-{
-	if (!root) {
-		(*left) = (*right) = NULL;
-		return;
-	}
-
-	if (pid <= root->pid) {
-		(*right) = root;
-		cifs_pid_tree_split(root->left, left, &((*right)->left), pid);
-	} else {
-		(*left) = root;
-		cifs_pid_tree_split(root->right, &((*left)->right), right, pid);
-	}
-}
-
-static struct cifsPidTree * cifs_pid_tree_merge(struct cifsPidTree *left, struct cifsPidTree *right)
-{
-	struct cifsPidTree *result = NULL;
-	if (!left) {
-		return right;
-	}
-	if (!right) {
-		return left;
-	}
-	if (left->priority <= right->priority) {
-		result = right;
-		result->left = cifs_pid_tree_merge(left, right->left);
-	} else {
-		result = left;
-		result->right = cifs_pid_tree_merge(left->right, right);
-	}
-	return result;
-}
-
-static struct cifsPidTree ** cifs_pid_tree_find_pid(struct cifsPidTree **root, __u32 pid)
-{
-	if (!(*root)) {
-		return root;
-	}
-	if (pid == (*root)->pid) {
-		return root;
-	} else if (pid < (*root)->pid) {
-		return cifs_pid_tree_find_pid(&((*root)->left), pid);
-	} else {
-		return cifs_pid_tree_find_pid(&((*root)->right), pid);
-	}
-}
-
-static int __cifs_lock_storage_add_lock(struct cifsPidTree **root, __u32 pid, unsigned long inodeId, __u16 fid, __u64 offset, __u64 len, __u8 type)
-{
-	struct cifsPidTreeLock *new_lock = NULL;
-	int rc = 0;
-	struct cifsPidTree **exist = NULL;
-	exist = cifs_pid_tree_find_pid(root, pid);
-	new_lock = kmalloc(sizeof(struct cifsPidTreeLock), GFP_KERNEL);
-	if (new_lock == NULL) {
-		return -ENOMEM;
-	}
-	new_lock->offset = offset;
-	new_lock->len = len;
-	new_lock->type = type;
-	new_lock->fid = fid;
-	new_lock->inodeId = inodeId;
-	if (!(*exist)) {
-		struct cifsPidTree *left = NULL, *right = NULL, *new_item = NULL;
-		rc = vertex_init(&new_item, pid);
-		if (rc) {
-			kfree(&new_lock);
-			return rc;
-		}
-		list_add(&new_lock->lock_list, &new_item->lock_list);
-		cifs_pid_tree_split((*root), &left, &right, pid);
-		(*root) = cifs_pid_tree_merge(left, new_item);
-		(*root) = cifs_pid_tree_merge((*root), right);
-	} else {
-		list_add(&new_lock->lock_list, &(*exist)->lock_list);
-	}
-	return rc;
-}
-
-static int __cifs_lock_storage_del_lock(int xid, struct cifsTconInfo *pTcon, struct cifsPidTree **root,
-		__u32 pid, unsigned long inodeId, __u64 offset, __u64 len, __u8 type)
-{
-	struct cifsPidTree **exist;
-	int rc = 0;
-	struct cifsPidTreeLock *li, *tmp;
-	exist = cifs_pid_tree_find_pid(root, pid);
-	if (!(*exist)) {
-		return -1;
-	}
-	list_for_each_entry_safe(li, tmp, &(*exist)->lock_list, lock_list) {
-		if (li->offset >= offset && (li->offset+li->len <= offset+len) && (inodeId == li->inodeId)) {
-			int tmp_rc = CIFSSMBLock(xid, pTcon,
-				li->fid,
-				li->len, li->offset,
-				1, 0, li->type, FALSE);
-			if (tmp_rc) {
-				rc = tmp_rc;
-			} else {
-				list_del(&li->lock_list);
-				kfree(li);
-			}
-		}
-	}
-	if (list_empty(&((*exist)->lock_list))) {
-		struct cifsPidTree *temp;
-		temp = (*exist);
-		(*exist) = cifs_pid_tree_merge((*exist)->left, (*exist)->right);
-		kfree(temp);
-	}
-	return rc;
-}
-
-int cifs_lock_storage_add_lock(__u32 pid, unsigned long inodeId, __u16 fid, __u64 offset, __u64 len, __u8 type)
-{
-	int rc;
-	mutex_lock(&storage_mutex);
-	rc = __cifs_lock_storage_add_lock(&LOCK_STORAGE, pid, inodeId, fid, offset, len, type);
-	mutex_unlock(&storage_mutex);
-	return rc;
-}
-
-int cifs_lock_storage_del_lock(int xid, struct cifsTconInfo *pTcon, __u32 pid, unsigned long inodeId, __u64 offset, __u64 len, __u8 type)
-{
-	int rc;
-	mutex_lock(&storage_mutex);
-	rc = __cifs_lock_storage_del_lock(xid, pTcon, &LOCK_STORAGE, pid, inodeId, offset, len, type);
-	mutex_unlock(&storage_mutex);
-	return rc;
-}

sources/centos52/cifs_lock_storage.h

-/*
- *   fs/cifs/cifs_lock_storage.h
- *
- *   lock tree operations that provide posix behaviour on windows server
- *
- *   Author(s): Pavel Shilovsky (piastryyy@gmail.com), Copyright (C) 2009.
- *
- *   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
- *
- */
-
-#ifndef CIFS_LOCK_STORAGE
-#define CIFS_LOCK_STORAGE
-
-/* creating lock tree */
-void cifs_lock_storage_init(void);
-
-/* inserting lock */
-int cifs_lock_storage_add_lock(__u32 pid, unsigned long inodeId, __u16 fid, __u64 offset, __u64 len, __u8 type);
-
-/* deleting lock */
-int cifs_lock_storage_del_lock(int xid, struct cifsTconInfo *pTcon, __u32 pid, unsigned long inodeId, __u64 offset, __u64 len, __u8 type);
-
-#endif

sources/centos52/cifsfs.c

@@ -41,7 +41,6 @@
 #include "cifsproto.h"
 #include "cifs_debug.h"
 #include "cifs_fs_sb.h"
-#include "cifs_lock_storage.h"
 #include <linux/mm.h>
 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,9)
 #include <linux/moduleparam.h>
@@ -1144,7 +1143,6 @@ init_cifs(void)
 	memset(Local_System_Name, 0, 15);
 	rwlock_init(&GlobalSMBSeslock);
 	spin_lock_init(&GlobalMid_Lock);
-	cifs_lock_storage_init();
 
 	if (cifs_max_pending < 2) {
 		cifs_max_pending = 2;

sources/centos52/file.c

@@ -47,7 +47,6 @@
 #include "cifs_unicode.h"
 #include "cifs_debug.h"
 #include "cifs_fs_sb.h"
-#include "cifs_lock_storage.h"
 
 static inline struct cifsFileInfo *cifs_init_private(
 	struct cifsFileInfo *private_data, struct inode *inode,
@@ -590,6 +589,7 @@ 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
@@ -619,6 +619,15 @@ int cifs_close(struct inode *inode, struct file *file)
 			}
 		}
 
+		/* Delete any outstanding lock records.
+		   We'll lose them when the file is closed anyway. */
+		mutex_lock(&pSMBFile->lock_mutex);
+		list_for_each_entry_safe(li, tmp, &pSMBFile->llist, llist) {
+			list_del(&li->llist);
+			kfree(li);
+		}
+		mutex_unlock(&pSMBFile->lock_mutex);
+
 		write_lock(&GlobalSMBSeslock);
 		list_del(&pSMBFile->flist);
 		list_del(&pSMBFile->tlist);
@@ -717,6 +726,22 @@ 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;
+	mutex_lock(&fid->lock_mutex);
+	list_add(&li->llist, &fid->llist);
+	mutex_unlock(&fid->lock_mutex);
+	return 0;
+}
+
 int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock)
 {
 	int rc, xid;
@@ -868,12 +893,33 @@ int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock)
 
 			if (rc == 0) {
 				/* For Windows locks we must store them. */
-				rc = cifs_lock_storage_add_lock(fid->pid, fid->pInode->i_ino, fid->netfid, pfLock->fl_start, length, lockType);
+				rc = store_file_lock(fid, length,
+						pfLock->fl_start, lockType);
 			}
 		} else if (numUnlock) {
 			/* For each stored lock that this unlock overlaps
 			   completely, unlock it. */
-			rc = cifs_lock_storage_del_lock(xid, pTcon, fid->pid, fid->pInode->i_ino, pfLock->fl_start, length, lockType);
+			int stored_rc = 0;
+			struct cifsLockInfo *li, *tmp;
+
+			rc = 0;
+			mutex_lock(&fid->lock_mutex);
+			list_for_each_entry_safe(li, tmp, &fid->llist, llist) {
+				if (pfLock->fl_start <= li->offset &&
+						(pfLock->fl_start + length) >=
+						(li->offset + 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);
+				}
+			}
+			mutex_unlock(&fid->lock_mutex);
 		}
 	}