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