[linux.git] / fs / cifs / smb2file.c

/*
 *   fs/cifs/smb2file.c
 *
 *   Copyright (C) International Business Machines  Corp., 2002, 2011
 *   Author(s): Steve French ([email protected]),
 *              Pavel Shilovsky (([email protected]) 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"

int
smb2_open_file(const unsigned int xid, struct cifs_open_parms *oparms,
	       __u32 *oplock, FILE_ALL_INFO *buf)
{
	int rc;
	__le16 *smb2_path;
	struct smb2_file_all_info *smb2_data = NULL;
	__u8 smb2_oplock[17];
	struct cifs_fid *fid = oparms->fid;

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

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

	oparms->desired_access |= FILE_READ_ATTRIBUTES;
	*smb2_oplock = SMB2_OPLOCK_LEVEL_BATCH;

	if (oparms->tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING)
		memcpy(smb2_oplock + 1, fid->lease_key, SMB2_LEASE_KEY_SIZE);

	rc = SMB2_open(xid, oparms, smb2_path, smb2_oplock, smb2_data, NULL);
	if (rc)
		goto out;

	if (buf) {
		/* open response does not have IndexNumber field - get it */
		rc = SMB2_get_srv_num(xid, oparms->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);
	}

	*oplock = *smb2_oplock;
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;

	down_write(&cinode->lock_sem);
	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);
	}
	up_write(&cinode->lock_sem);

	kfree(buf);
	return rc;
}

static int
smb2_push_mand_fdlocks(struct cifs_fid_locks *fdlocks, const unsigned int xid,
		       struct smb2_lock_element *buf, unsigned int max_num)
{
	int rc = 0, stored_rc;
	struct cifsFileInfo *cfile = fdlocks->cfile;
	struct cifsLockInfo *li;
	unsigned int num = 0;
	struct smb2_lock_element *cur = buf;
	struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);

	list_for_each_entry(li, &fdlocks->locks, llist) {
		cur->Length = cpu_to_le64(li->length);
		cur->Offset = cpu_to_le64(li->offset);
		cur->Flags = cpu_to_le32(li->type |
						SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
		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)
				rc = stored_rc;
			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)
			rc = stored_rc;
	}

	return rc;
}

int
smb2_push_mandatory_locks(struct cifsFileInfo *cfile)
{
	int rc = 0, stored_rc;
	unsigned int xid;
	unsigned int max_num, max_buf;
	struct smb2_lock_element *buf;
	struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
	struct cifs_fid_locks *fdlocks;

	xid = get_xid();

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

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

	list_for_each_entry(fdlocks, &cinode->llist, llist) {
		stored_rc = smb2_push_mand_fdlocks(fdlocks, xid, buf, max_num);
		if (stored_rc)
			rc = stored_rc;
	}

	kfree(buf);
	free_xid(xid);
	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 ([email protected]),
	6	* Pavel Shilovsky (([email protected]) 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
	37	int
226730b4 PS	38	smb2_open_file(const unsigned int xid, struct cifs_open_parms *oparms,
226730b4 PS	39	__u32 oplock, FILE_ALL_INFO buf)
f0df737e PS	40	{
	41	int rc;
	42	__le16 *smb2_path;
	43	struct smb2_file_all_info *smb2_data = NULL;
b8c32dbb	44	__u8 smb2_oplock[17];
226730b4	45	struct cifs_fid *fid = oparms->fid;
f0df737e	46
226730b4	47	smb2_path = cifs_convert_path_to_utf16(oparms->path, oparms->cifs_sb);
f0df737e PS	48	if (smb2_path == NULL) {
	49	rc = -ENOMEM;
	50	goto out;
	51	}
	52
1bbe4997	53	smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
f0df737e PS	54	GFP_KERNEL);
	55	if (smb2_data == NULL) {
	56	rc = -ENOMEM;
	57	goto out;
	58	}
	59
226730b4	60	oparms->desired_access \|= FILE_READ_ATTRIBUTES;
63eb3def	61	*smb2_oplock = SMB2_OPLOCK_LEVEL_BATCH;
b8c32dbb	62
226730b4	63	if (oparms->tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING)
b8c32dbb	64	memcpy(smb2_oplock + 1, fid->lease_key, SMB2_LEASE_KEY_SIZE);
f0df737e	65
b42bf888	66	rc = SMB2_open(xid, oparms, smb2_path, smb2_oplock, smb2_data, NULL);
f0df737e PS	67	if (rc)
	68	goto out;
	69
	70	if (buf) {
	71	/* open response does not have IndexNumber field - get it */
226730b4	72	rc = SMB2_get_srv_num(xid, oparms->tcon, fid->persistent_fid,
f0df737e PS	73	fid->volatile_fid,
	74	&smb2_data->IndexNumber);
	75	if (rc) {
	76	/* let get_inode_info disable server inode numbers */
	77	smb2_data->IndexNumber = 0;
	78	rc = 0;
	79	}
	80	move_smb2_info_to_cifs(buf, smb2_data);
	81	}
	82
b8c32dbb	83	oplock = smb2_oplock;
f0df737e	84	out:
f0df737e PS	85	kfree(smb2_data);
	86	kfree(smb2_path);
	87	return rc;
	88	}
f7ba7fe6 PS	89
	90	int
	91	smb2_unlock_range(struct cifsFileInfo cfile, struct file_lock flock,
	92	const unsigned int xid)
	93	{
	94	int rc = 0, stored_rc;
	95	unsigned int max_num, num = 0, max_buf;
	96	struct smb2_lock_element buf, cur;
	97	struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
	98	struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
	99	struct cifsLockInfo li, tmp;
	100	__u64 length = 1 + flock->fl_end - flock->fl_start;
	101	struct list_head tmp_llist;
	102
	103	INIT_LIST_HEAD(&tmp_llist);
	104
	105	/*
	106	* Accessing maxBuf is racy with cifs_reconnect - need to store value
	107	* and check it for zero before using.
	108	*/
	109	max_buf = tcon->ses->server->maxBuf;
	110	if (!max_buf)
	111	return -EINVAL;
	112
	113	max_num = max_buf / sizeof(struct smb2_lock_element);
	114	buf = kzalloc(max_num * sizeof(struct smb2_lock_element), GFP_KERNEL);
	115	if (!buf)
	116	return -ENOMEM;
	117
	118	cur = buf;
	119
1b4b55a1	120	down_write(&cinode->lock_sem);
f7ba7fe6 PS	121	list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) {
	122	if (flock->fl_start > li->offset \|\|
	123	(flock->fl_start + length) <
	124	(li->offset + li->length))
	125	continue;
	126	if (current->tgid != li->pid)
	127	continue;
	128	if (cinode->can_cache_brlcks) {
	129	/*
	130	* We can cache brlock requests - simply remove a lock
	131	* from the file's list.
	132	*/
	133	list_del(&li->llist);
	134	cifs_del_lock_waiters(li);
	135	kfree(li);
	136	continue;
	137	}
	138	cur->Length = cpu_to_le64(li->length);
	139	cur->Offset = cpu_to_le64(li->offset);
	140	cur->Flags = cpu_to_le32(SMB2_LOCKFLAG_UNLOCK);
	141	/*
	142	* We need to save a lock here to let us add it again to the
	143	* file's list if the unlock range request fails on the server.
	144	*/
	145	list_move(&li->llist, &tmp_llist);
	146	if (++num == max_num) {
	147	stored_rc = smb2_lockv(xid, tcon,
	148	cfile->fid.persistent_fid,
	149	cfile->fid.volatile_fid,
	150	current->tgid, num, buf);
	151	if (stored_rc) {
	152	/*
	153	* We failed on the unlock range request - add
	154	* all locks from the tmp list to the head of
	155	* the file's list.
	156	*/
	157	cifs_move_llist(&tmp_llist,
	158	&cfile->llist->locks);
	159	rc = stored_rc;
	160	} else
	161	/*
	162	* The unlock range request succeed - free the
	163	* tmp list.
	164	*/
	165	cifs_free_llist(&tmp_llist);
	166	cur = buf;
	167	num = 0;
	168	} else
	169	cur++;
	170	}
	171	if (num) {
	172	stored_rc = smb2_lockv(xid, tcon, cfile->fid.persistent_fid,
	173	cfile->fid.volatile_fid, current->tgid,
	174	num, buf);
	175	if (stored_rc) {
	176	cifs_move_llist(&tmp_llist, &cfile->llist->locks);
	177	rc = stored_rc;
	178	} else
	179	cifs_free_llist(&tmp_llist);
	180	}
1b4b55a1	181	up_write(&cinode->lock_sem);
f7ba7fe6 PS	182
	183	kfree(buf);
	184	return rc;
	185	}
b140799a PS	186
	187	static int
	188	smb2_push_mand_fdlocks(struct cifs_fid_locks *fdlocks, const unsigned int xid,
	189	struct smb2_lock_element *buf, unsigned int max_num)
	190	{
	191	int rc = 0, stored_rc;
	192	struct cifsFileInfo *cfile = fdlocks->cfile;
	193	struct cifsLockInfo *li;
	194	unsigned int num = 0;
	195	struct smb2_lock_element *cur = buf;
	196	struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
	197
	198	list_for_each_entry(li, &fdlocks->locks, llist) {
	199	cur->Length = cpu_to_le64(li->length);
	200	cur->Offset = cpu_to_le64(li->offset);
	201	cur->Flags = cpu_to_le32(li->type \|
	202	SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
	203	if (++num == max_num) {
	204	stored_rc = smb2_lockv(xid, tcon,
	205	cfile->fid.persistent_fid,
	206	cfile->fid.volatile_fid,
	207	current->tgid, num, buf);
	208	if (stored_rc)
	209	rc = stored_rc;
	210	cur = buf;
	211	num = 0;
	212	} else
	213	cur++;
	214	}
	215	if (num) {
	216	stored_rc = smb2_lockv(xid, tcon,
	217	cfile->fid.persistent_fid,
	218	cfile->fid.volatile_fid,
	219	current->tgid, num, buf);
	220	if (stored_rc)
	221	rc = stored_rc;
	222	}
	223
	224	return rc;
	225	}
	226
	227	int
	228	smb2_push_mandatory_locks(struct cifsFileInfo *cfile)
	229	{
	230	int rc = 0, stored_rc;
	231	unsigned int xid;
	232	unsigned int max_num, max_buf;
	233	struct smb2_lock_element *buf;
	234	struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
	235	struct cifs_fid_locks *fdlocks;
	236
	237	xid = get_xid();
b140799a PS	238
	239	/*
	240	* Accessing maxBuf is racy with cifs_reconnect - need to store value
	241	* and check it for zero before using.
	242	*/
	243	max_buf = tlink_tcon(cfile->tlink)->ses->server->maxBuf;
	244	if (!max_buf) {
b140799a PS	245	free_xid(xid);
	246	return -EINVAL;
	247	}
	248
	249	max_num = max_buf / sizeof(struct smb2_lock_element);
	250	buf = kzalloc(max_num * sizeof(struct smb2_lock_element), GFP_KERNEL);
	251	if (!buf) {
b140799a PS	252	free_xid(xid);
	253	return -ENOMEM;
	254	}
	255
	256	list_for_each_entry(fdlocks, &cinode->llist, llist) {
	257	stored_rc = smb2_push_mand_fdlocks(fdlocks, xid, buf, max_num);
	258	if (stored_rc)
	259	rc = stored_rc;
	260	}
	261
b140799a	262	kfree(buf);
b140799a PS	263	free_xid(xid);
	264	return rc;
	265	}