fs/cifs/smb2file.c - linux - Git at Google

 // SPDX-License-Identifier: LGPL-2.1
 /*
  *   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
  *
  */
 #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;
 	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;

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


 	if (oparms->tcon->use_resilient) {
 		/* default timeout is 0, servers pick default (120 seconds) */
 		nr_ioctl_req.Timeout =
 			cpu_to_le32(oparms->tcon->handle_timeout);
 		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),
 			CIFSMaxBufSize, 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) {
 		/* if open response does not have IndexNumber field - get it */
 		if (smb2_data->IndexNumber == 0) {
 			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 before using.
 	 */
 	max_buf = tcon->ses->server->maxBuf;
 	if (max_buf < sizeof(struct smb2_lock_element))
 		return -EINVAL;

 	BUILD_BUG_ON(sizeof(struct smb2_lock_element) > PAGE_SIZE);
 	max_buf = min_t(unsigned int, max_buf, PAGE_SIZE);
 	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;

 	cifs_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)
 			/*
 			 * flock and OFD lock are associated with an open
 			 * file description, not the process.
 			 */
 			if (!(flock->fl_flags & (FL_FLOCK | FL_OFDLCK)))
 				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;
 	}

 	BUILD_BUG_ON(sizeof(struct smb2_lock_element) > PAGE_SIZE);
 	max_buf = min_t(unsigned int, max_buf, PAGE_SIZE);
 	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;
 }
	// SPDX-License-Identifier: LGPL-2.1
	/*
	* 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
	*
	*/
	#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;
	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;

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


	if (oparms->tcon->use_resilient) {
	/* default timeout is 0, servers pick default (120 seconds) */
	nr_ioctl_req.Timeout =
	cpu_to_le32(oparms->tcon->handle_timeout);
	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),
	CIFSMaxBufSize, 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) {
	/* if open response does not have IndexNumber field - get it */
	if (smb2_data->IndexNumber == 0) {
	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 before using.
	*/
	max_buf = tcon->ses->server->maxBuf;
	if (max_buf < sizeof(struct smb2_lock_element))
	return -EINVAL;

	BUILD_BUG_ON(sizeof(struct smb2_lock_element) > PAGE_SIZE);
	max_buf = min_t(unsigned int, max_buf, PAGE_SIZE);
	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;

	cifs_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)
	/*
	* flock and OFD lock are associated with an open
	* file description, not the process.
	*/
	if (!(flock->fl_flags & (FL_FLOCK \| FL_OFDLCK)))
	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;
	}

	BUILD_BUG_ON(sizeof(struct smb2_lock_element) > PAGE_SIZE);
	max_buf = min_t(unsigned int, max_buf, PAGE_SIZE);
	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;
	}