[mirror_ubuntu-artful-kernel.git] / fs / cifs / smb2file.c

/*
 *   fs/cifs/smb2file.c
 *
 *   Copyright (C) International Business Machines  Corp., 2002, 2011
 *   Author(s): Steve French (sfrench@us.ibm.com),
 *              Pavel Shilovsky ((pshilovsky@samba.org) 2012
 *
 *   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>
#include <linux/stat.h>
#include <linux/slab.h>
#include <linux/pagemap.h>
#include <asm/div64.h>
#include "cifsfs.h"
#include "cifspdu.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_debug.h"
#include "cifs_fs_sb.h"
#include "cifs_unicode.h"
#include "fscache.h"
#include "smb2proto.h"

void
smb2_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock)
{
	oplock &= 0xFF;
	if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE) {
		cinode->clientCanCacheAll = true;
		cinode->clientCanCacheRead = true;
		cFYI(1, "Exclusive Oplock granted on inode %p",
		     &cinode->vfs_inode);
	} else if (oplock == SMB2_OPLOCK_LEVEL_II) {
		cinode->clientCanCacheAll = false;
		cinode->clientCanCacheRead = true;
		cFYI(1, "Level II Oplock granted on inode %p",
		    &cinode->vfs_inode);
	} else {
		cinode->clientCanCacheAll = false;
		cinode->clientCanCacheRead = false;
	}
}

int
smb2_open_file(const unsigned int xid, struct cifs_tcon *tcon, const char *path,
	       int disposition, int desired_access, int create_options,
	       struct cifs_fid *fid, __u32 *oplock, FILE_ALL_INFO *buf,
	       struct cifs_sb_info *cifs_sb)
{
	int rc;
	__le16 *smb2_path;
	struct smb2_file_all_info *smb2_data = NULL;

	smb2_path = cifs_convert_path_to_utf16(path, cifs_sb);
	if (smb2_path == NULL) {
		rc = -ENOMEM;
		goto out;
	}

	smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + MAX_NAME * 2,
			    GFP_KERNEL);
	if (smb2_data == NULL) {
		rc = -ENOMEM;
		goto out;
	}

	desired_access |= FILE_READ_ATTRIBUTES;
	*oplock = SMB2_OPLOCK_LEVEL_EXCLUSIVE;

	rc = SMB2_open(xid, tcon, smb2_path, &fid->persistent_fid,
		       &fid->volatile_fid, desired_access, disposition,
		       0, 0, (__u8 *)oplock, smb2_data);
	if (rc)
		goto out;

	if (buf) {
		/* open response does not have IndexNumber field - get it */
		rc = SMB2_get_srv_num(xid, tcon, fid->persistent_fid,
				      fid->volatile_fid,
				      &smb2_data->IndexNumber);
		if (rc) {
			/* let get_inode_info disable server inode numbers */
			smb2_data->IndexNumber = 0;
			rc = 0;
		}
		move_smb2_info_to_cifs(buf, smb2_data);
	}

out:
	kfree(smb2_data);
	kfree(smb2_path);
	return rc;
}

int
smb2_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock,
		  const unsigned int xid)
{
	int rc = 0, stored_rc;
	unsigned int max_num, num = 0, max_buf;
	struct smb2_lock_element *buf, *cur;
	struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
	struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
	struct cifsLockInfo *li, *tmp;
	__u64 length = 1 + flock->fl_end - flock->fl_start;
	struct list_head tmp_llist;

	INIT_LIST_HEAD(&tmp_llist);

	/*
	 * Accessing maxBuf is racy with cifs_reconnect - need to store value
	 * and check it for zero before using.
	 */
	max_buf = tcon->ses->server->maxBuf;
	if (!max_buf)
		return -EINVAL;

	max_num = max_buf / sizeof(struct smb2_lock_element);
	buf = kzalloc(max_num * sizeof(struct smb2_lock_element), GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

	cur = buf;

	mutex_lock(&cinode->lock_mutex);
	list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) {
		if (flock->fl_start > li->offset ||
		    (flock->fl_start + length) <
		    (li->offset + li->length))
			continue;
		if (current->tgid != li->pid)
			continue;
		if (cinode->can_cache_brlcks) {
			/*
			 * We can cache brlock requests - simply remove a lock
			 * from the file's list.
			 */
			list_del(&li->llist);
			cifs_del_lock_waiters(li);
			kfree(li);
			continue;
		}
		cur->Length = cpu_to_le64(li->length);
		cur->Offset = cpu_to_le64(li->offset);
		cur->Flags = cpu_to_le32(SMB2_LOCKFLAG_UNLOCK);
		/*
		 * We need to save a lock here to let us add it again to the
		 * file's list if the unlock range request fails on the server.
		 */
		list_move(&li->llist, &tmp_llist);
		if (++num == max_num) {
			stored_rc = smb2_lockv(xid, tcon,
					       cfile->fid.persistent_fid,
					       cfile->fid.volatile_fid,
					       current->tgid, num, buf);
			if (stored_rc) {
				/*
				 * We failed on the unlock range request - add
				 * all locks from the tmp list to the head of
				 * the file's list.
				 */
				cifs_move_llist(&tmp_llist,
						&cfile->llist->locks);
				rc = stored_rc;
			} else
				/*
				 * The unlock range request succeed - free the
				 * tmp list.
				 */
				cifs_free_llist(&tmp_llist);
			cur = buf;
			num = 0;
		} else
			cur++;
	}
	if (num) {
		stored_rc = smb2_lockv(xid, tcon, cfile->fid.persistent_fid,
				       cfile->fid.volatile_fid, current->tgid,
				       num, buf);
		if (stored_rc) {
			cifs_move_llist(&tmp_llist, &cfile->llist->locks);
			rc = stored_rc;
		} else
			cifs_free_llist(&tmp_llist);
	}
	mutex_unlock(&cinode->lock_mutex);

	kfree(buf);
	return rc;
}
Commit	Line	Data
f0df737e PS	1	/*
	2	* fs/cifs/smb2file.c
	3	*
	4	* Copyright (C) International Business Machines Corp., 2002, 2011
	5	* Author(s): Steve French (sfrench@us.ibm.com),
	6	* Pavel Shilovsky ((pshilovsky@samba.org) 2012
	7	*
	8	* This library is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU Lesser General Public License as published
	10	* by the Free Software Foundation; either version 2.1 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This library is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
	16	* the GNU Lesser General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU Lesser General Public License
	19	* along with this library; if not, write to the Free Software
	20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	21	*/
	22	#include <linux/fs.h>
	23	#include <linux/stat.h>
	24	#include <linux/slab.h>
	25	#include <linux/pagemap.h>
	26	#include <asm/div64.h>
	27	#include "cifsfs.h"
	28	#include "cifspdu.h"
	29	#include "cifsglob.h"
	30	#include "cifsproto.h"
	31	#include "cifs_debug.h"
	32	#include "cifs_fs_sb.h"
	33	#include "cifs_unicode.h"
	34	#include "fscache.h"
	35	#include "smb2proto.h"
	36
2e44b288 PS	37	void
	38	smb2_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock)
	39	{
	40	oplock &= 0xFF;
	41	if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE) {
	42	cinode->clientCanCacheAll = true;
	43	cinode->clientCanCacheRead = true;
	44	cFYI(1, "Exclusive Oplock granted on inode %p",
	45	&cinode->vfs_inode);
	46	} else if (oplock == SMB2_OPLOCK_LEVEL_II) {
	47	cinode->clientCanCacheAll = false;
	48	cinode->clientCanCacheRead = true;
	49	cFYI(1, "Level II Oplock granted on inode %p",
	50	&cinode->vfs_inode);
	51	} else {
	52	cinode->clientCanCacheAll = false;
	53	cinode->clientCanCacheRead = false;
	54	}
	55	}
	56
f0df737e PS	57	int
	58	smb2_open_file(const unsigned int xid, struct cifs_tcon tcon, const char path,
	59	int disposition, int desired_access, int create_options,
	60	struct cifs_fid fid, __u32 oplock, FILE_ALL_INFO *buf,
	61	struct cifs_sb_info *cifs_sb)
	62	{
	63	int rc;
	64	__le16 *smb2_path;
	65	struct smb2_file_all_info *smb2_data = NULL;
	66
	67	smb2_path = cifs_convert_path_to_utf16(path, cifs_sb);
	68	if (smb2_path == NULL) {
	69	rc = -ENOMEM;
	70	goto out;
	71	}
	72
	73	smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + MAX_NAME * 2,
	74	GFP_KERNEL);
	75	if (smb2_data == NULL) {
	76	rc = -ENOMEM;
	77	goto out;
	78	}
	79
	80	desired_access \|= FILE_READ_ATTRIBUTES;
2e44b288	81	*oplock = SMB2_OPLOCK_LEVEL_EXCLUSIVE;
f0df737e PS	82
	83	rc = SMB2_open(xid, tcon, smb2_path, &fid->persistent_fid,
	84	&fid->volatile_fid, desired_access, disposition,
2e44b288	85	0, 0, (__u8 *)oplock, smb2_data);
f0df737e PS	86	if (rc)
	87	goto out;
	88
	89	if (buf) {
	90	/* open response does not have IndexNumber field - get it */
	91	rc = SMB2_get_srv_num(xid, tcon, fid->persistent_fid,
	92	fid->volatile_fid,
	93	&smb2_data->IndexNumber);
	94	if (rc) {
	95	/* let get_inode_info disable server inode numbers */
	96	smb2_data->IndexNumber = 0;
	97	rc = 0;
	98	}
	99	move_smb2_info_to_cifs(buf, smb2_data);
	100	}
	101
	102	out:
f0df737e PS	103	kfree(smb2_data);
	104	kfree(smb2_path);
	105	return rc;
	106	}
f7ba7fe6 PS	107
	108	int
	109	smb2_unlock_range(struct cifsFileInfo cfile, struct file_lock flock,
	110	const unsigned int xid)
	111	{
	112	int rc = 0, stored_rc;
	113	unsigned int max_num, num = 0, max_buf;
	114	struct smb2_lock_element buf, cur;
	115	struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
	116	struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
	117	struct cifsLockInfo li, tmp;
	118	__u64 length = 1 + flock->fl_end - flock->fl_start;
	119	struct list_head tmp_llist;
	120
	121	INIT_LIST_HEAD(&tmp_llist);
	122
	123	/*
	124	* Accessing maxBuf is racy with cifs_reconnect - need to store value
	125	* and check it for zero before using.
	126	*/
	127	max_buf = tcon->ses->server->maxBuf;
	128	if (!max_buf)
	129	return -EINVAL;
	130
	131	max_num = max_buf / sizeof(struct smb2_lock_element);
	132	buf = kzalloc(max_num * sizeof(struct smb2_lock_element), GFP_KERNEL);
	133	if (!buf)
	134	return -ENOMEM;
	135
	136	cur = buf;
	137
	138	mutex_lock(&cinode->lock_mutex);
	139	list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) {
	140	if (flock->fl_start > li->offset \|\|
	141	(flock->fl_start + length) <
	142	(li->offset + li->length))
	143	continue;
	144	if (current->tgid != li->pid)
	145	continue;
	146	if (cinode->can_cache_brlcks) {
	147	/*
	148	* We can cache brlock requests - simply remove a lock
	149	* from the file's list.
	150	*/
	151	list_del(&li->llist);
	152	cifs_del_lock_waiters(li);
	153	kfree(li);
	154	continue;
	155	}
	156	cur->Length = cpu_to_le64(li->length);
	157	cur->Offset = cpu_to_le64(li->offset);
	158	cur->Flags = cpu_to_le32(SMB2_LOCKFLAG_UNLOCK);
	159	/*
	160	* We need to save a lock here to let us add it again to the
	161	* file's list if the unlock range request fails on the server.
	162	*/
	163	list_move(&li->llist, &tmp_llist);
	164	if (++num == max_num) {
	165	stored_rc = smb2_lockv(xid, tcon,
	166	cfile->fid.persistent_fid,
	167	cfile->fid.volatile_fid,
	168	current->tgid, num, buf);
	169	if (stored_rc) {
	170	/*
171	* We failed on the unlock range request - add
172	* all locks from the tmp list to the head of
173	* the file's list.
174	*/
175	cifs_move_llist(&tmp_llist,
176	&cfile->llist->locks);
177	rc = stored_rc;
178	} else
179	/*
180	* The unlock range request succeed - free the
181	* tmp list.
182	*/
183	cifs_free_llist(&tmp_llist);
184	cur = buf;
185	num = 0;
186	} else
187	cur++;
188	}
189	if (num) {
190	stored_rc = smb2_lockv(xid, tcon, cfile->fid.persistent_fid,
191	cfile->fid.volatile_fid, current->tgid,
192	num, buf);
193	if (stored_rc) {
194	cifs_move_llist(&tmp_llist, &cfile->llist->locks);
195	rc = stored_rc;
196	} else
197	cifs_free_llist(&tmp_llist);
198	}
199	mutex_unlock(&cinode->lock_mutex);
200
201	kfree(buf);
202	return rc;
203	}