[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"

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;
	struct network_resiliency_req nr_ioctl_req;

	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 (oparms->tcon->use_resilient) {
		nr_ioctl_req.Timeout = 0; /* use server default (120 seconds) */
		nr_ioctl_req.Reserved = 0;
		rc = SMB2_ioctl(xid, oparms->tcon, fid->persistent_fid,
			fid->volatile_fid, FSCTL_LMR_REQUEST_RESILIENCY,
			true /* is_fsctl */,
			(char *)&nr_ioctl_req, sizeof(nr_ioctl_req),
			NULL, NULL /* no return info */);
		if (rc == -EOPNOTSUPP) {
			cifs_dbg(VFS,
			     "resiliency not supported by server, disabling\n");
			oparms->tcon->use_resilient = false;
		} else if (rc)
			cifs_dbg(FYI, "error %d setting resiliency\n", rc);

		rc = 0;
	}

	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(d_inode(cfile->dentry));
	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 = kcalloc(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(d_inode(cfile->dentry));
	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 < sizeof(struct smb2_lock_element)) {
		free_xid(xid);
		return -EINVAL;
	}

	max_num = max_buf / sizeof(struct smb2_lock_element);
	buf = kcalloc(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 (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
	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;
592fafe6	46	struct network_resiliency_req nr_ioctl_req;
f0df737e	47
226730b4	48	smb2_path = cifs_convert_path_to_utf16(oparms->path, oparms->cifs_sb);
f0df737e PS	49	if (smb2_path == NULL) {
	50	rc = -ENOMEM;
	51	goto out;
	52	}
	53
1bbe4997	54	smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
f0df737e PS	55	GFP_KERNEL);
	56	if (smb2_data == NULL) {
	57	rc = -ENOMEM;
	58	goto out;
	59	}
	60
226730b4	61	oparms->desired_access \|= FILE_READ_ATTRIBUTES;
63eb3def	62	*smb2_oplock = SMB2_OPLOCK_LEVEL_BATCH;
b8c32dbb	63
226730b4	64	if (oparms->tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING)
b8c32dbb	65	memcpy(smb2_oplock + 1, fid->lease_key, SMB2_LEASE_KEY_SIZE);
f0df737e	66
b42bf888	67	rc = SMB2_open(xid, oparms, smb2_path, smb2_oplock, smb2_data, NULL);
f0df737e PS	68	if (rc)
	69	goto out;
	70
592fafe6 SF	71
	72	if (oparms->tcon->use_resilient) {
	73	nr_ioctl_req.Timeout = 0; /* use server default (120 seconds) */
	74	nr_ioctl_req.Reserved = 0;
	75	rc = SMB2_ioctl(xid, oparms->tcon, fid->persistent_fid,
51146625	76	fid->volatile_fid, FSCTL_LMR_REQUEST_RESILIENCY,
0dc8cfba	77	true /* is_fsctl */,
592fafe6 SF	78	(char *)&nr_ioctl_req, sizeof(nr_ioctl_req),
	79	NULL, NULL /* no return info */);
	80	if (rc == -EOPNOTSUPP) {
	81	cifs_dbg(VFS,
	82	"resiliency not supported by server, disabling\n");
	83	oparms->tcon->use_resilient = false;
	84	} else if (rc)
	85	cifs_dbg(FYI, "error %d setting resiliency\n", rc);
	86
	87	rc = 0;
	88	}
	89
f0df737e PS	90	if (buf) {
f0df737e PS	91	/* open response does not have IndexNumber field - get it */
226730b4	92	rc = SMB2_get_srv_num(xid, oparms->tcon, fid->persistent_fid,
f0df737e PS	93	fid->volatile_fid,
	94	&smb2_data->IndexNumber);
	95	if (rc) {
	96	/* let get_inode_info disable server inode numbers */
	97	smb2_data->IndexNumber = 0;
	98	rc = 0;
	99	}
	100	move_smb2_info_to_cifs(buf, smb2_data);
	101	}
	102
b8c32dbb	103	oplock = smb2_oplock;
f0df737e	104	out:
f0df737e PS	105	kfree(smb2_data);
	106	kfree(smb2_path);
	107	return rc;
	108	}
f7ba7fe6 PS	109
	110	int
	111	smb2_unlock_range(struct cifsFileInfo cfile, struct file_lock flock,
	112	const unsigned int xid)
	113	{
	114	int rc = 0, stored_rc;
	115	unsigned int max_num, num = 0, max_buf;
	116	struct smb2_lock_element buf, cur;
	117	struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
2b0143b5	118	struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
f7ba7fe6 PS	119	struct cifsLockInfo li, tmp;
	120	__u64 length = 1 + flock->fl_end - flock->fl_start;
	121	struct list_head tmp_llist;
	122
	123	INIT_LIST_HEAD(&tmp_llist);
	124
	125	/*
	126	* Accessing maxBuf is racy with cifs_reconnect - need to store value
	127	* and check it for zero before using.
	128	*/
	129	max_buf = tcon->ses->server->maxBuf;
	130	if (!max_buf)
	131	return -EINVAL;
	132
	133	max_num = max_buf / sizeof(struct smb2_lock_element);
662e9b2b	134	buf = kcalloc(max_num, sizeof(struct smb2_lock_element), GFP_KERNEL);
f7ba7fe6 PS	135	if (!buf)
	136	return -ENOMEM;
	137
	138	cur = buf;
	139
1b4b55a1	140	down_write(&cinode->lock_sem);
f7ba7fe6 PS	141	list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) {
	142	if (flock->fl_start > li->offset \|\|
	143	(flock->fl_start + length) <
	144	(li->offset + li->length))
	145	continue;
	146	if (current->tgid != li->pid)
	147	continue;
	148	if (cinode->can_cache_brlcks) {
	149	/*
	150	* We can cache brlock requests - simply remove a lock
	151	* from the file's list.
	152	*/
	153	list_del(&li->llist);
	154	cifs_del_lock_waiters(li);
	155	kfree(li);
	156	continue;
	157	}
	158	cur->Length = cpu_to_le64(li->length);
	159	cur->Offset = cpu_to_le64(li->offset);
	160	cur->Flags = cpu_to_le32(SMB2_LOCKFLAG_UNLOCK);
	161	/*
	162	* We need to save a lock here to let us add it again to the
	163	* file's list if the unlock range request fails on the server.
	164	*/
	165	list_move(&li->llist, &tmp_llist);
	166	if (++num == max_num) {
	167	stored_rc = smb2_lockv(xid, tcon,
	168	cfile->fid.persistent_fid,
	169	cfile->fid.volatile_fid,
	170	current->tgid, num, buf);
	171	if (stored_rc) {
	172	/*
	173	* We failed on the unlock range request - add
	174	* all locks from the tmp list to the head of
	175	* the file's list.
	176	*/
	177	cifs_move_llist(&tmp_llist,
	178	&cfile->llist->locks);
	179	rc = stored_rc;
	180	} else
	181	/*
	182	* The unlock range request succeed - free the
	183	* tmp list.
	184	*/
	185	cifs_free_llist(&tmp_llist);
	186	cur = buf;
	187	num = 0;
	188	} else
	189	cur++;
	190	}
	191	if (num) {
	192	stored_rc = smb2_lockv(xid, tcon, cfile->fid.persistent_fid,
	193	cfile->fid.volatile_fid, current->tgid,
	194	num, buf);
	195	if (stored_rc) {
	196	cifs_move_llist(&tmp_llist, &cfile->llist->locks);
	197	rc = stored_rc;
	198	} else
	199	cifs_free_llist(&tmp_llist);
	200	}
1b4b55a1	201	up_write(&cinode->lock_sem);
f7ba7fe6 PS	202
	203	kfree(buf);
	204	return rc;
	205	}
b140799a PS	206
	207	static int
	208	smb2_push_mand_fdlocks(struct cifs_fid_locks *fdlocks, const unsigned int xid,
	209	struct smb2_lock_element *buf, unsigned int max_num)
	210	{
	211	int rc = 0, stored_rc;
	212	struct cifsFileInfo *cfile = fdlocks->cfile;
	213	struct cifsLockInfo *li;
	214	unsigned int num = 0;
	215	struct smb2_lock_element *cur = buf;
	216	struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
	217
	218	list_for_each_entry(li, &fdlocks->locks, llist) {
	219	cur->Length = cpu_to_le64(li->length);
	220	cur->Offset = cpu_to_le64(li->offset);
	221	cur->Flags = cpu_to_le32(li->type \|
	222	SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
	223	if (++num == max_num) {
	224	stored_rc = smb2_lockv(xid, tcon,
	225	cfile->fid.persistent_fid,
	226	cfile->fid.volatile_fid,
	227	current->tgid, num, buf);
	228	if (stored_rc)
	229	rc = stored_rc;
	230	cur = buf;
	231	num = 0;
	232	} else
	233	cur++;
	234	}
	235	if (num) {
	236	stored_rc = smb2_lockv(xid, tcon,
	237	cfile->fid.persistent_fid,
	238	cfile->fid.volatile_fid,
	239	current->tgid, num, buf);
	240	if (stored_rc)
	241	rc = stored_rc;
	242	}
	243
	244	return rc;
	245	}
	246
	247	int
	248	smb2_push_mandatory_locks(struct cifsFileInfo *cfile)
	249	{
	250	int rc = 0, stored_rc;
	251	unsigned int xid;
	252	unsigned int max_num, max_buf;
	253	struct smb2_lock_element *buf;
2b0143b5	254	struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
b140799a PS	255	struct cifs_fid_locks *fdlocks;
	256
	257	xid = get_xid();
b140799a PS	258
	259	/*
	260	* Accessing maxBuf is racy with cifs_reconnect - need to store value
	261	* and check it for zero before using.
	262	*/
	263	max_buf = tlink_tcon(cfile->tlink)->ses->server->maxBuf;
e3d240e9	264	if (max_buf < sizeof(struct smb2_lock_element)) {
b140799a PS	265	free_xid(xid);
	266	return -EINVAL;
	267	}
	268
	269	max_num = max_buf / sizeof(struct smb2_lock_element);
662e9b2b	270	buf = kcalloc(max_num, sizeof(struct smb2_lock_element), GFP_KERNEL);
b140799a	271	if (!buf) {
b140799a PS	272	free_xid(xid);
	273	return -ENOMEM;
	274	}
	275
	276	list_for_each_entry(fdlocks, &cinode->llist, llist) {
	277	stored_rc = smb2_push_mand_fdlocks(fdlocks, xid, buf, max_num);
	278	if (stored_rc)
	279	rc = stored_rc;
	280	}
	281
b140799a	282	kfree(buf);
b140799a PS	283	free_xid(xid);
	284	return rc;
	285	}