[deliverable/linux.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_NOCHANGE)
		return;
	if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE) {
		cinode->clientCanCacheAll = true;
		cinode->clientCanCacheRead = true;
		cifs_dbg(FYI, "Exclusive Oplock granted on inode %p\n",
			 &cinode->vfs_inode);
	} else if (oplock == SMB2_OPLOCK_LEVEL_II) {
		cinode->clientCanCacheAll = false;
		cinode->clientCanCacheRead = true;
		cifs_dbg(FYI, "Level II Oplock granted on inode %p\n",
			 &cinode->vfs_inode);
	} else {
		cinode->clientCanCacheAll = false;
		cinode->clientCanCacheRead = false;
	}
}

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) + MAX_NAME * 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);
	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 (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;
0822f514 PS	41	if (oplock == SMB2_OPLOCK_LEVEL_NOCHANGE)
0822f514 PS	42	return;
2e44b288 PS	43	if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE) {
	44	cinode->clientCanCacheAll = true;
	45	cinode->clientCanCacheRead = true;
f96637be JP	46	cifs_dbg(FYI, "Exclusive Oplock granted on inode %p\n",
f96637be JP	47	&cinode->vfs_inode);
2e44b288 PS	48	} else if (oplock == SMB2_OPLOCK_LEVEL_II) {
	49	cinode->clientCanCacheAll = false;
	50	cinode->clientCanCacheRead = true;
f96637be JP	51	cifs_dbg(FYI, "Level II Oplock granted on inode %p\n",
f96637be JP	52	&cinode->vfs_inode);
2e44b288 PS	53	} else {
	54	cinode->clientCanCacheAll = false;
	55	cinode->clientCanCacheRead = false;
	56	}
	57	}
	58
f0df737e	59	int
226730b4 PS	60	smb2_open_file(const unsigned int xid, struct cifs_open_parms *oparms,
226730b4 PS	61	__u32 oplock, FILE_ALL_INFO buf)
f0df737e PS	62	{
	63	int rc;
	64	__le16 *smb2_path;
	65	struct smb2_file_all_info *smb2_data = NULL;
b8c32dbb	66	__u8 smb2_oplock[17];
226730b4	67	struct cifs_fid *fid = oparms->fid;
f0df737e	68
226730b4	69	smb2_path = cifs_convert_path_to_utf16(oparms->path, oparms->cifs_sb);
f0df737e PS	70	if (smb2_path == NULL) {
	71	rc = -ENOMEM;
	72	goto out;
	73	}
	74
	75	smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + MAX_NAME * 2,
	76	GFP_KERNEL);
	77	if (smb2_data == NULL) {
	78	rc = -ENOMEM;
	79	goto out;
	80	}
	81
226730b4	82	oparms->desired_access \|= FILE_READ_ATTRIBUTES;
63eb3def	83	*smb2_oplock = SMB2_OPLOCK_LEVEL_BATCH;
b8c32dbb	84
226730b4	85	if (oparms->tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING)
b8c32dbb	86	memcpy(smb2_oplock + 1, fid->lease_key, SMB2_LEASE_KEY_SIZE);
f0df737e	87
064f6047	88	rc = SMB2_open(xid, oparms, smb2_path, smb2_oplock, smb2_data);
f0df737e PS	89	if (rc)
	90	goto out;
	91
	92	if (buf) {
	93	/* open response does not have IndexNumber field - get it */
226730b4	94	rc = SMB2_get_srv_num(xid, oparms->tcon, fid->persistent_fid,
f0df737e PS	95	fid->volatile_fid,
	96	&smb2_data->IndexNumber);
	97	if (rc) {
	98	/* let get_inode_info disable server inode numbers */
	99	smb2_data->IndexNumber = 0;
	100	rc = 0;
	101	}
	102	move_smb2_info_to_cifs(buf, smb2_data);
	103	}
	104
b8c32dbb	105	oplock = smb2_oplock;
f0df737e	106	out:
f0df737e PS	107	kfree(smb2_data);
	108	kfree(smb2_path);
	109	return rc;
	110	}
f7ba7fe6 PS	111
	112	int
	113	smb2_unlock_range(struct cifsFileInfo cfile, struct file_lock flock,
	114	const unsigned int xid)
	115	{
	116	int rc = 0, stored_rc;
	117	unsigned int max_num, num = 0, max_buf;
	118	struct smb2_lock_element buf, cur;
	119	struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
	120	struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
	121	struct cifsLockInfo li, tmp;
	122	__u64 length = 1 + flock->fl_end - flock->fl_start;
	123	struct list_head tmp_llist;
	124
	125	INIT_LIST_HEAD(&tmp_llist);
	126
	127	/*
	128	* Accessing maxBuf is racy with cifs_reconnect - need to store value
	129	* and check it for zero before using.
	130	*/
	131	max_buf = tcon->ses->server->maxBuf;
	132	if (!max_buf)
	133	return -EINVAL;
	134
	135	max_num = max_buf / sizeof(struct smb2_lock_element);
	136	buf = kzalloc(max_num * sizeof(struct smb2_lock_element), GFP_KERNEL);
	137	if (!buf)
	138	return -ENOMEM;
	139
	140	cur = buf;
	141
1b4b55a1	142	down_write(&cinode->lock_sem);
f7ba7fe6 PS	143	list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) {
	144	if (flock->fl_start > li->offset \|\|
	145	(flock->fl_start + length) <
	146	(li->offset + li->length))
	147	continue;
	148	if (current->tgid != li->pid)
	149	continue;
	150	if (cinode->can_cache_brlcks) {
	151	/*
	152	* We can cache brlock requests - simply remove a lock
	153	* from the file's list.
	154	*/
	155	list_del(&li->llist);
	156	cifs_del_lock_waiters(li);
	157	kfree(li);
	158	continue;
	159	}
	160	cur->Length = cpu_to_le64(li->length);
	161	cur->Offset = cpu_to_le64(li->offset);
	162	cur->Flags = cpu_to_le32(SMB2_LOCKFLAG_UNLOCK);
	163	/*
	164	* We need to save a lock here to let us add it again to the
	165	* file's list if the unlock range request fails on the server.
	166	*/
	167	list_move(&li->llist, &tmp_llist);
	168	if (++num == max_num) {
	169	stored_rc = smb2_lockv(xid, tcon,
	170	cfile->fid.persistent_fid,
	171	cfile->fid.volatile_fid,
	172	current->tgid, num, buf);
	173	if (stored_rc) {
	174	/*
	175	* We failed on the unlock range request - add
	176	* all locks from the tmp list to the head of
	177	* the file's list.
	178	*/
	179	cifs_move_llist(&tmp_llist,
	180	&cfile->llist->locks);
	181	rc = stored_rc;
	182	} else
	183	/*
	184	* The unlock range request succeed - free the
	185	* tmp list.
	186	*/
	187	cifs_free_llist(&tmp_llist);
	188	cur = buf;
	189	num = 0;
	190	} else
	191	cur++;
	192	}
	193	if (num) {
	194	stored_rc = smb2_lockv(xid, tcon, cfile->fid.persistent_fid,
	195	cfile->fid.volatile_fid, current->tgid,
	196	num, buf);
	197	if (stored_rc) {
	198	cifs_move_llist(&tmp_llist, &cfile->llist->locks);
	199	rc = stored_rc;
	200	} else
	201	cifs_free_llist(&tmp_llist);
	202	}
1b4b55a1	203	up_write(&cinode->lock_sem);
f7ba7fe6 PS	204
	205	kfree(buf);
	206	return rc;
	207	}
b140799a PS	208
	209	static int
	210	smb2_push_mand_fdlocks(struct cifs_fid_locks *fdlocks, const unsigned int xid,
	211	struct smb2_lock_element *buf, unsigned int max_num)
	212	{
	213	int rc = 0, stored_rc;
	214	struct cifsFileInfo *cfile = fdlocks->cfile;
	215	struct cifsLockInfo *li;
	216	unsigned int num = 0;
	217	struct smb2_lock_element *cur = buf;
	218	struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
	219
	220	list_for_each_entry(li, &fdlocks->locks, llist) {
	221	cur->Length = cpu_to_le64(li->length);
	222	cur->Offset = cpu_to_le64(li->offset);
	223	cur->Flags = cpu_to_le32(li->type \|
	224	SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
	225	if (++num == max_num) {
	226	stored_rc = smb2_lockv(xid, tcon,
	227	cfile->fid.persistent_fid,
	228	cfile->fid.volatile_fid,
	229	current->tgid, num, buf);
	230	if (stored_rc)
	231	rc = stored_rc;
	232	cur = buf;
	233	num = 0;
	234	} else
	235	cur++;
	236	}
	237	if (num) {
	238	stored_rc = smb2_lockv(xid, tcon,
	239	cfile->fid.persistent_fid,
	240	cfile->fid.volatile_fid,
	241	current->tgid, num, buf);
	242	if (stored_rc)
	243	rc = stored_rc;
	244	}
	245
	246	return rc;
	247	}
	248
	249	int
	250	smb2_push_mandatory_locks(struct cifsFileInfo *cfile)
	251	{
	252	int rc = 0, stored_rc;
	253	unsigned int xid;
	254	unsigned int max_num, max_buf;
	255	struct smb2_lock_element *buf;
	256	struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
	257	struct cifs_fid_locks *fdlocks;
	258
	259	xid = get_xid();
b140799a PS	260
	261	/*
	262	* Accessing maxBuf is racy with cifs_reconnect - need to store value
	263	* and check it for zero before using.
	264	*/
	265	max_buf = tlink_tcon(cfile->tlink)->ses->server->maxBuf;
	266	if (!max_buf) {
b140799a PS	267	free_xid(xid);
	268	return -EINVAL;
	269	}
	270
	271	max_num = max_buf / sizeof(struct smb2_lock_element);
	272	buf = kzalloc(max_num * sizeof(struct smb2_lock_element), GFP_KERNEL);
	273	if (!buf) {
b140799a PS	274	free_xid(xid);
	275	return -ENOMEM;
	276	}
	277
	278	list_for_each_entry(fdlocks, &cinode->llist, llist) {
	279	stored_rc = smb2_push_mand_fdlocks(fdlocks, xid, buf, max_num);
	280	if (stored_rc)
	281	rc = stored_rc;
	282	}
	283
b140799a	284	kfree(buf);
b140799a PS	285	free_xid(xid);
	286	return rc;
	287	}