Exemplo n.º 1
0
static struct cifs_ntsd *get_cifs_acl_by_path(struct cifs_sb_info *cifs_sb,
		const char *path, u32 *pacllen)
{
	struct cifs_ntsd *pntsd = NULL;
	int oplock = 0;
	int xid, rc, create_options = 0;
	__u16 fid;
	struct cifs_tcon *tcon;
	struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);

	if (IS_ERR(tlink))
		return ERR_CAST(tlink);

	tcon = tlink_tcon(tlink);
	xid = GetXid();

	if (backup_cred(cifs_sb))
		create_options |= CREATE_OPEN_BACKUP_INTENT;

	rc = CIFSSMBOpen(xid, tcon, path, FILE_OPEN, READ_CONTROL,
			create_options, &fid, &oplock, NULL, cifs_sb->local_nls,
			cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	if (!rc) {
		rc = CIFSSMBGetCIFSACL(xid, tcon, fid, &pntsd, pacllen);
		CIFSSMBClose(xid, tcon, fid);
	}

	cifs_put_tlink(tlink);
	FreeXid(xid);

	cFYI(1, "%s: rc = %d ACL len %d", __func__, rc, *pacllen);
	if (rc)
		return ERR_PTR(rc);
	return pntsd;
}
Exemplo n.º 2
0
static struct cifs_ntsd *get_cifs_acl_by_path(struct cifs_sb_info *cifs_sb,
		const char *path, u32 *pacllen)
{
	struct cifs_ntsd *pntsd = NULL;
	int oplock = 0;
	int xid, rc;
	__u16 fid;

	xid = GetXid();

	rc = CIFSSMBOpen(xid, cifs_sb->tcon, path, FILE_OPEN, READ_CONTROL, 0,
			 &fid, &oplock, NULL, cifs_sb->local_nls,
			 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	if (rc) {
		cERROR(1, "Unable to open file to get ACL");
		goto out;
	}

	rc = CIFSSMBGetCIFSACL(xid, cifs_sb->tcon, fid, &pntsd, pacllen);
	cFYI(1, "GetCIFSACL rc = %d ACL len %d", rc, *pacllen);

	CIFSSMBClose(xid, cifs_sb->tcon, fid);
 out:
	FreeXid(xid);
	return pntsd;
}
Exemplo n.º 3
0
static int set_cifs_acl_by_path(struct cifs_sb_info *cifs_sb, const char *path,
		struct cifs_ntsd *pnntsd, u32 acllen)
{
	int oplock = 0;
	int xid, rc;
	__u16 fid;

	xid = GetXid();

	rc = CIFSSMBOpen(xid, cifs_sb->tcon, path, FILE_OPEN, WRITE_DAC, 0,
			 &fid, &oplock, NULL, cifs_sb->local_nls,
			 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	if (rc) {
		cERROR(1, "Unable to open file to set ACL");
		goto out;
	}

	rc = CIFSSMBSetCIFSACL(xid, cifs_sb->tcon, fid, pnntsd, acllen);
	cFYI(DBG2, "SetCIFSACL rc = %d", rc);

	CIFSSMBClose(xid, cifs_sb->tcon, fid);
 out:
	FreeXid(xid);
	return rc;
}
Exemplo n.º 4
0
int cifs_dir_notify(struct file *file, unsigned long arg)
{
	int xid;
	int rc = -EINVAL;
	int oplock = FALSE;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	char *full_path = NULL;
	__u32 filter = FILE_NOTIFY_CHANGE_NAME | FILE_NOTIFY_CHANGE_ATTRIBUTES;
	__u16 netfid;

	if (experimEnabled == 0)
		return 0;

	xid = GetXid();
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 20)
	cifs_sb = CIFS_SB(file->f_dentry->d_sb);
	pTcon = cifs_sb->tcon;

	full_path = build_path_from_dentry(file->f_dentry);
#else
	cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
	pTcon = cifs_sb->tcon;

	full_path = build_path_from_dentry(file->f_path.dentry);
#endif

	if (full_path == NULL) {
		rc = -ENOMEM;
	} else {
		cFYI(1, ("dir notify on file %s Arg 0x%lx", full_path, arg));
		rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
			GENERIC_READ | SYNCHRONIZE, FILE_SHARE_ALL, 0 /* create options */,
			&netfid, &oplock, NULL, cifs_sb->local_nls,
			cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
		/* BB fixme - add this handle to a notify handle list */
		if (rc) {
			cFYI(1, ("Could not open directory for notify"));
		} else {
			filter = convert_to_cifs_notify_flags(arg);
			if (filter != 0) {
				rc = CIFSSMBNotify(xid, pTcon,
					0 /* no subdirs */, netfid,
					filter, file, arg & DN_MULTISHOT,
					cifs_sb->local_nls);
			} else {
				rc = -EINVAL;
			}
			/* BB add code to close file eventually (at unmount
			it would close automatically but may be a way
			to do it easily when inode freed or when
			notify info is cleared/changed */
			cFYI(1, ("notify rc %d", rc));
		}
	}

	FreeXid(xid);
	return rc;
}
Exemplo n.º 5
0
/* Retrieve an ACL from the server */
static struct cifs_ntsd *get_cifs_acl(u32 *pacllen, struct inode *inode,
				       const char *path, const __u16 *pfid)
{
	struct cifsFileInfo *open_file = NULL;
	bool unlock_file = false;
	int xid;
	int rc = -EIO;
	__u16 fid;
	struct super_block *sb;
	struct cifs_sb_info *cifs_sb;
	struct cifs_ntsd *pntsd = NULL;

	cFYI(1, ("get mode from ACL for %s", path));

	if (inode == NULL)
		return NULL;

	xid = GetXid();
	if (pfid == NULL)
		open_file = find_readable_file(CIFS_I(inode));
	else
		fid = *pfid;

	sb = inode->i_sb;
	if (sb == NULL) {
		FreeXid(xid);
		return NULL;
	}
	cifs_sb = CIFS_SB(sb);

	if (open_file) {
		unlock_file = true;
		fid = open_file->netfid;
	} else if (pfid == NULL) {
		int oplock = 0;
		/* open file */
		rc = CIFSSMBOpen(xid, cifs_sb->tcon, path, FILE_OPEN,
				READ_CONTROL, 0, &fid, &oplock, NULL,
				cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
					CIFS_MOUNT_MAP_SPECIAL_CHR);
		if (rc != 0) {
			cERROR(1, ("Unable to open file to get ACL"));
			FreeXid(xid);
			return NULL;
		}
	}

	rc = CIFSSMBGetCIFSACL(xid, cifs_sb->tcon, fid, &pntsd, pacllen);
	cFYI(1, ("GetCIFSACL rc = %d ACL len %d", rc, *pacllen));
	if (unlock_file == true) /* find_readable_file increments ref count */
		atomic_dec(&open_file->wrtPending);
	else if (pfid == NULL) /* if opened above we have to close the handle */
		CIFSSMBClose(xid, cifs_sb->tcon, fid);
	/* else handle was passed in by caller */

	FreeXid(xid);
	return pntsd;
}
Exemplo n.º 6
0
static int
CIFSCreateMFSymLink(const int xid, struct cifs_tcon *tcon,
		    const char *fromName, const char *toName,
		    struct cifs_sb_info *cifs_sb)
{
	int rc;
	int oplock = 0;
	int remap;
	int create_options = CREATE_NOT_DIR;
	__u16 netfid = 0;
	u8 *buf;
	unsigned int bytes_written = 0;
	struct cifs_io_parms io_parms;
	struct nls_table *nls_codepage;

	nls_codepage = cifs_sb->local_nls;
	remap = cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR;

	buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

	rc = CIFSFormatMFSymlink(buf, CIFS_MF_SYMLINK_FILE_SIZE, toName);
	if (rc != 0) {
		kfree(buf);
		return rc;
	}

	if (backup_cred(cifs_sb))
		create_options |= CREATE_OPEN_BACKUP_INTENT;

	rc = CIFSSMBOpen(xid, tcon, fromName, FILE_CREATE, GENERIC_WRITE,
			 create_options, &netfid, &oplock, NULL,
			 nls_codepage, remap);
	if (rc != 0) {
		kfree(buf);
		return rc;
	}

	io_parms.netfid = netfid;
	io_parms.pid = current->tgid;
	io_parms.tcon = tcon;
	io_parms.offset = 0;
	io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;

	rc = CIFSSMBWrite(xid, &io_parms, &bytes_written, buf, NULL, 0);
	CIFSSMBClose(xid, tcon, netfid);
	kfree(buf);
	if (rc != 0)
		return rc;

	if (bytes_written != CIFS_MF_SYMLINK_FILE_SIZE)
		return -EIO;

	return 0;
}
Exemplo n.º 7
0
static int
CIFSQueryMFSymLink(const int xid, struct cifs_tcon *tcon,
		   const unsigned char *searchName, char **symlinkinfo,
		   const struct nls_table *nls_codepage, int remap)
{
	int rc;
	int oplock = 0;
	__u16 netfid = 0;
	u8 *buf;
	char *pbuf;
	unsigned int bytes_read = 0;
	int buf_type = CIFS_NO_BUFFER;
	unsigned int link_len = 0;
	struct cifs_io_parms io_parms;
	FILE_ALL_INFO file_info;

	rc = CIFSSMBOpen(xid, tcon, searchName, FILE_OPEN, GENERIC_READ,
			 CREATE_NOT_DIR, &netfid, &oplock, &file_info,
			 nls_codepage, remap);
	if (rc != 0)
		return rc;

	if (file_info.EndOfFile != cpu_to_le64(CIFS_MF_SYMLINK_FILE_SIZE)) {
		CIFSSMBClose(xid, tcon, netfid);
		/* it's not a symlink */
		return -EINVAL;
	}

	buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;
	pbuf = buf;
	io_parms.netfid = netfid;
	io_parms.pid = current->tgid;
	io_parms.tcon = tcon;
	io_parms.offset = 0;
	io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;

	rc = CIFSSMBRead(xid, &io_parms, &bytes_read, &pbuf, &buf_type);
	CIFSSMBClose(xid, tcon, netfid);
	if (rc != 0) {
		kfree(buf);
		return rc;
	}

	rc = CIFSParseMFSymlink(buf, bytes_read, &link_len, symlinkinfo);
	kfree(buf);
	if (rc != 0)
		return rc;

	return 0;
}
Exemplo n.º 8
0
/* Set an ACL on the server */
static int set_cifs_acl(struct cifs_ntsd *pnntsd, __u32 acllen,
				struct inode *inode, const char *path)
{
	struct cifsFileInfo *open_file;
	bool unlock_file = false;
	int xid;
	int rc = -EIO;
	__u16 fid;
	struct super_block *sb;
	struct cifs_sb_info *cifs_sb;

	cFYI(DBG2, ("set ACL for %s from mode 0x%x", path, inode->i_mode));

	if (!inode)
		return rc;

	sb = inode->i_sb;
	if (sb == NULL)
		return rc;

	cifs_sb = CIFS_SB(sb);
	xid = GetXid();

	open_file = find_readable_file(CIFS_I(inode));
	if (open_file) {
		unlock_file = true;
		fid = open_file->netfid;
	} else {
		int oplock = 0;
		/* open file */
		rc = CIFSSMBOpen(xid, cifs_sb->tcon, path, FILE_OPEN,
				WRITE_DAC, 0, &fid, &oplock, NULL,
				cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
					CIFS_MOUNT_MAP_SPECIAL_CHR);
		if (rc != 0) {
			cERROR(1, ("Unable to open file to set ACL"));
			FreeXid(xid);
			return rc;
		}
	}

	rc = CIFSSMBSetCIFSACL(xid, cifs_sb->tcon, fid, pnntsd, acllen);
	cFYI(DBG2, ("SetCIFSACL rc = %d", rc));
	if (unlock_file)
		atomic_dec(&open_file->wrtPending);
	else
		CIFSSMBClose(xid, cifs_sb->tcon, fid);

	FreeXid(xid);

	return rc;
}
Exemplo n.º 9
0
int cifs_dir_notify(struct file * file, unsigned long arg)
{
	int xid;
	int rc = -EINVAL;
	int oplock = FALSE;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	char *full_path = NULL;
	__u32 filter = FILE_NOTIFY_CHANGE_NAME | FILE_NOTIFY_CHANGE_ATTRIBUTES;
	__u16 netfid;

	xid = GetXid();
	cifs_sb = CIFS_SB(file->f_dentry->d_sb);
	pTcon = cifs_sb->tcon;

	down(&file->f_dentry->d_sb->s_vfs_rename_sem);
	full_path = build_path_from_dentry(file->f_dentry);
	up(&file->f_dentry->d_sb->s_vfs_rename_sem);

	if(full_path == NULL) {
		rc = -ENOMEM;
	} else {
		cERROR(1,("cifs dir notify on file %s with arg 0x%lx",full_path,arg)); /* BB removeme BB */
		rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, 
			GENERIC_READ | SYNCHRONIZE, 0 /* create options */,
			&netfid, &oplock,NULL, cifs_sb->local_nls);
		/* BB fixme - add this handle to a notify handle list */
		if(rc) {
			cERROR(1,("Could not open directory for notify"));  /* BB remove BB */
		} else {
			filter = convert_to_cifs_notify_flags(arg);
			if(filter != 0) {
				rc = CIFSSMBNotify(xid, pTcon, 0 /* no subdirs */, netfid, 
					filter, cifs_sb->local_nls);
			} else {
				rc = -EINVAL;
			}
			/* BB add code to close file eventually (at unmount
			it would close automatically but may be a way
			to do it easily when inode freed or when
			notify info is cleared/changed */
            cERROR(1,("notify rc %d",rc));
		}
	}
	
	FreeXid(xid);
	return rc;
}
Exemplo n.º 10
0
static int
CIFSCreateMFSymLink(const int xid, struct cifs_tcon *tcon,
		    const char *fromName, const char *toName,
		    const struct nls_table *nls_codepage, int remap)
{
	int rc;
	int oplock = 0;
	__u16 netfid = 0;
	u8 *buf;
	unsigned int bytes_written = 0;
	struct cifs_io_parms io_parms;

	buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

	rc = CIFSFormatMFSymlink(buf, CIFS_MF_SYMLINK_FILE_SIZE, toName);
	if (rc != 0) {
		kfree(buf);
		return rc;
	}

	rc = CIFSSMBOpen(xid, tcon, fromName, FILE_CREATE, GENERIC_WRITE,
			 CREATE_NOT_DIR, &netfid, &oplock, NULL,
			 nls_codepage, remap);
	if (rc != 0) {
		kfree(buf);
		return rc;
	}

	io_parms.netfid = netfid;
	io_parms.pid = current->tgid;
	io_parms.tcon = tcon;
	io_parms.offset = 0;
	io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;

	rc = CIFSSMBWrite(xid, &io_parms, &bytes_written, buf, NULL, 0);
	CIFSSMBClose(xid, tcon, netfid);
	kfree(buf);
	if (rc != 0)
		return rc;

	if (bytes_written != CIFS_MF_SYMLINK_FILE_SIZE)
		return -EIO;

	return 0;
}
Exemplo n.º 11
0
 /* Set an ACL on the server */
int set_cifs_acl(struct cifs_ntsd *pnntsd, __u32 acllen,
			struct inode *inode, const char *path, int aclflag)
{
	int oplock = 0;
	unsigned int xid;
	int rc, access_flags, create_options = 0;
	__u16 fid;
	struct cifs_tcon *tcon;
	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
	struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);

	if (IS_ERR(tlink))
		return PTR_ERR(tlink);

	tcon = tlink_tcon(tlink);
	xid = get_xid();

	if (backup_cred(cifs_sb))
		create_options |= CREATE_OPEN_BACKUP_INTENT;

	if (aclflag == CIFS_ACL_OWNER || aclflag == CIFS_ACL_GROUP)
		access_flags = WRITE_OWNER;
	else
		access_flags = WRITE_DAC;

	rc = CIFSSMBOpen(xid, tcon, path, FILE_OPEN, access_flags,
			create_options, &fid, &oplock, NULL, cifs_sb->local_nls,
			cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	if (rc) {
		cERROR(1, "Unable to open file to set ACL");
		goto out;
	}

	rc = CIFSSMBSetCIFSACL(xid, tcon, fid, pnntsd, acllen, aclflag);
	cFYI(DBG2, "SetCIFSACL rc = %d", rc);

	CIFSSMBClose(xid, tcon, fid);
out:
	free_xid(xid);
	cifs_put_tlink(tlink);
	return rc;
}
Exemplo n.º 12
0
int cifs_mknod(struct inode *inode, struct dentry *direntry, umode_t mode,
		dev_t device_number)
{
	int rc = -EPERM;
	unsigned int xid;
	int create_options = CREATE_NOT_DIR | CREATE_OPTION_SPECIAL;
	struct cifs_sb_info *cifs_sb;
	struct tcon_link *tlink;
	struct cifs_tcon *pTcon;
	struct cifs_io_parms io_parms;
	char *full_path = NULL;
	struct inode *newinode = NULL;
	int oplock = 0;
	u16 fileHandle;
	FILE_ALL_INFO *buf = NULL;
	unsigned int bytes_written;
	struct win_dev *pdev;

	if (!old_valid_dev(device_number))
		return -EINVAL;

	cifs_sb = CIFS_SB(inode->i_sb);
	tlink = cifs_sb_tlink(cifs_sb);
	if (IS_ERR(tlink))
		return PTR_ERR(tlink);

	pTcon = tlink_tcon(tlink);

	xid = get_xid();

	full_path = build_path_from_dentry(direntry);
	if (full_path == NULL) {
		rc = -ENOMEM;
		goto mknod_out;
	}

	if (pTcon->unix_ext) {
		struct cifs_unix_set_info_args args = {
			.mode	= mode & ~current_umask(),
			.ctime	= NO_CHANGE_64,
			.atime	= NO_CHANGE_64,
			.mtime	= NO_CHANGE_64,
			.device	= device_number,
		};
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
			args.uid = current_fsuid();
			args.gid = current_fsgid();
		} else {
			args.uid = INVALID_UID; /* no change */
			args.gid = INVALID_GID; /* no change */
		}
		rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, &args,
					    cifs_sb->local_nls,
					    cifs_sb->mnt_cifs_flags &
						CIFS_MOUNT_MAP_SPECIAL_CHR);
		if (rc)
			goto mknod_out;

		rc = cifs_get_inode_info_unix(&newinode, full_path,
						inode->i_sb, xid);

		if (rc == 0)
			d_instantiate(direntry, newinode);
		goto mknod_out;
	}

	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
		goto mknod_out;


	cifs_dbg(FYI, "sfu compat create special file\n");

	buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
	if (buf == NULL) {
		kfree(full_path);
		rc = -ENOMEM;
		free_xid(xid);
		return rc;
	}

	if (backup_cred(cifs_sb))
		create_options |= CREATE_OPEN_BACKUP_INTENT;

	rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_CREATE,
			 GENERIC_WRITE, create_options,
			 &fileHandle, &oplock, buf, cifs_sb->local_nls,
			 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	if (rc)
		goto mknod_out;

	/* BB Do not bother to decode buf since no local inode yet to put
	 * timestamps in, but we can reuse it safely */

	pdev = (struct win_dev *)buf;
	io_parms.netfid = fileHandle;
	io_parms.pid = current->tgid;
	io_parms.tcon = pTcon;
	io_parms.offset = 0;
	io_parms.length = sizeof(struct win_dev);
	if (S_ISCHR(mode)) {
		memcpy(pdev->type, "IntxCHR", 8);
		pdev->major =
		      cpu_to_le64(MAJOR(device_number));
		pdev->minor =
		      cpu_to_le64(MINOR(device_number));
		rc = CIFSSMBWrite(xid, &io_parms,
			&bytes_written, (char *)pdev,
			NULL, 0);
	} else if (S_ISBLK(mode)) {
		memcpy(pdev->type, "IntxBLK", 8);
		pdev->major =
		      cpu_to_le64(MAJOR(device_number));
		pdev->minor =
		      cpu_to_le64(MINOR(device_number));
		rc = CIFSSMBWrite(xid, &io_parms,
			&bytes_written, (char *)pdev,
			NULL, 0);
	} /* else if (S_ISFIFO) */
	CIFSSMBClose(xid, pTcon, fileHandle);
	d_drop(direntry);

	/* FIXME: add code here to set EAs */

mknod_out:
	kfree(full_path);
	kfree(buf);
	free_xid(xid);
	cifs_put_tlink(tlink);
	return rc;
}
Exemplo n.º 13
0
int cifs_rename(struct inode *source_inode, struct dentry *source_direntry,
	struct inode *target_inode, struct dentry *target_direntry)
{
	char *fromName;
	char *toName;
	struct cifs_sb_info *cifs_sb_source;
	struct cifs_sb_info *cifs_sb_target;
	struct cifsTconInfo *pTcon;
	int xid;
	int rc = 0;

	xid = GetXid();

	cifs_sb_target = CIFS_SB(target_inode->i_sb);
	cifs_sb_source = CIFS_SB(source_inode->i_sb);
	pTcon = cifs_sb_source->tcon;

	if (pTcon != cifs_sb_target->tcon) {
		FreeXid(xid);
		return -EXDEV;	/* BB actually could be allowed if same server,
				   but different share.
				   Might eventually add support for this */
	}

	/* we already  have the rename sem so we do not need to grab it again
	   here to protect the path integrity */
	fromName = build_path_from_dentry(source_direntry);
	toName = build_path_from_dentry(target_direntry);
	if ((fromName == NULL) || (toName == NULL)) {
		rc = -ENOMEM;
		goto cifs_rename_exit;
	}

	rc = CIFSSMBRename(xid, pTcon, fromName, toName,
			   cifs_sb_source->local_nls,
			   cifs_sb_source->mnt_cifs_flags &
				CIFS_MOUNT_MAP_SPECIAL_CHR);
	if (rc == -EEXIST) {
		/* check if they are the same file because rename of hardlinked
		   files is a noop */
		FILE_UNIX_BASIC_INFO *info_buf_source;
		FILE_UNIX_BASIC_INFO *info_buf_target;

		info_buf_source =
			kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
		if (info_buf_source != NULL) {
			info_buf_target = info_buf_source + 1;
			if (pTcon->unix_ext)
				rc = CIFSSMBUnixQPathInfo(xid, pTcon, fromName,
					info_buf_source,
					cifs_sb_source->local_nls,
					cifs_sb_source->mnt_cifs_flags &
						CIFS_MOUNT_MAP_SPECIAL_CHR);
			/* else rc is still EEXIST so will fall through to
			   unlink the target and retry rename */
			if (rc == 0) {
				rc = CIFSSMBUnixQPathInfo(xid, pTcon, toName,
						info_buf_target,
						cifs_sb_target->local_nls,
						/* remap based on source sb */
						cifs_sb_source->mnt_cifs_flags &
						    CIFS_MOUNT_MAP_SPECIAL_CHR);
			}
			if ((rc == 0) &&
			    (info_buf_source->UniqueId ==
			     info_buf_target->UniqueId)) {
			/* do not rename since the files are hardlinked which
			   is a noop */
			} else {
			/* we either can not tell the files are hardlinked
			   (as with Windows servers) or files are not
			   hardlinked so delete the target manually before
			   renaming to follow POSIX rather than Windows
			   semantics */
				cifs_unlink(target_inode, target_direntry);
				rc = CIFSSMBRename(xid, pTcon, fromName,
						   toName,
						   cifs_sb_source->local_nls,
						   cifs_sb_source->mnt_cifs_flags
						   & CIFS_MOUNT_MAP_SPECIAL_CHR);
			}
			kfree(info_buf_source);
		} /* if we can not get memory just leave rc as EEXIST */
	}

	if (rc)
		cFYI(1, ("rename rc %d", rc));

	if ((rc == -EIO) || (rc == -EEXIST)) {
		int oplock = FALSE;
		__u16 netfid;

		/* BB FIXME Is Generic Read correct for rename? */
		/* if renaming directory - we should not say CREATE_NOT_DIR,
		   need to test renaming open directory, also GENERIC_READ
		   might not right be right access to request */
		rc = CIFSSMBOpen(xid, pTcon, fromName, FILE_OPEN, GENERIC_READ, FILE_SHARE_ALL,
				 CREATE_NOT_DIR, &netfid, &oplock, NULL,
				 cifs_sb_source->local_nls,
				 cifs_sb_source->mnt_cifs_flags &
					CIFS_MOUNT_MAP_SPECIAL_CHR);
		if (rc == 0) {
			rc = CIFSSMBRenameOpenFile(xid, pTcon, netfid, toName,
					      cifs_sb_source->local_nls,
					      cifs_sb_source->mnt_cifs_flags &
						CIFS_MOUNT_MAP_SPECIAL_CHR);
			CIFSSMBClose(xid, pTcon, netfid);
		}
	}

cifs_rename_exit:
	kfree(fromName);
	kfree(toName);
	FreeXid(xid);
	return rc;
}
Exemplo n.º 14
0
int
cifs_create(struct inode *inode, struct dentry *direntry, int mode,
		struct nameidata *nd)
{
	int rc = -ENOENT;
	int xid;
	int create_options = CREATE_NOT_DIR;
	int oplock = 0;
	int desiredAccess = GENERIC_READ | GENERIC_WRITE;
	__u16 fileHandle;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	char *full_path = NULL;
	FILE_ALL_INFO *buf = NULL;
	struct inode *newinode = NULL;
	struct cifsFileInfo *pCifsFile = NULL;
	struct cifsInodeInfo *pCifsInode;
	int disposition = FILE_OVERWRITE_IF;
	bool write_only = false;

	xid = GetXid();

	cifs_sb = CIFS_SB(inode->i_sb);
	pTcon = cifs_sb->tcon;

	full_path = build_path_from_dentry(direntry);
	if (full_path == NULL) {
		FreeXid(xid);
		return -ENOMEM;
	}

	if (nd && (nd->flags & LOOKUP_OPEN)) {
		int oflags = nd->intent.open.flags;

		desiredAccess = 0;
		if (oflags & FMODE_READ)
			desiredAccess |= GENERIC_READ;
		if (oflags & FMODE_WRITE) {
			desiredAccess |= GENERIC_WRITE;
			if (!(oflags & FMODE_READ))
				write_only = true;
		}

		if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
			disposition = FILE_CREATE;
		else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
			disposition = FILE_OVERWRITE_IF;
		else if ((oflags & O_CREAT) == O_CREAT)
			disposition = FILE_OPEN_IF;
		else
			cFYI(1, ("Create flag not set in create function"));
	}

	/* BB add processing to set equivalent of mode - e.g. via CreateX with
	   ACLs */
	if (oplockEnabled)
		oplock = REQ_OPLOCK;

	buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
	if (buf == NULL) {
		kfree(full_path);
		FreeXid(xid);
		return -ENOMEM;
	}

	mode &= ~current->fs->umask;

	/*
	 * if we're not using unix extensions, see if we need to set
	 * ATTR_READONLY on the create call
	 */
	if (!pTcon->unix_ext && (mode & S_IWUGO) == 0)
		create_options |= CREATE_OPTION_READONLY;

	if (cifs_sb->tcon->ses->capabilities & CAP_NT_SMBS)
		rc = CIFSSMBOpen(xid, pTcon, full_path, disposition,
			 desiredAccess, create_options,
			 &fileHandle, &oplock, buf, cifs_sb->local_nls,
			 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	else
		rc = -EIO; /* no NT SMB support fall into legacy open below */

	if (rc == -EIO) {
		/* old server, retry the open legacy style */
		rc = SMBLegacyOpen(xid, pTcon, full_path, disposition,
			desiredAccess, create_options,
			&fileHandle, &oplock, buf, cifs_sb->local_nls,
			cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	}
	if (rc) {
		cFYI(1, ("cifs_create returned 0x%x", rc));
	} else {
		/* If Open reported that we actually created a file
		then we now have to set the mode if possible */
		if ((pTcon->unix_ext) && (oplock & CIFS_CREATE_ACTION)) {
			struct cifs_unix_set_info_args args = {
				.mode	= mode,
				.ctime	= NO_CHANGE_64,
				.atime	= NO_CHANGE_64,
				.mtime	= NO_CHANGE_64,
				.device	= 0,
			};

			if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
				args.uid = (__u64) current->fsuid;
				if (inode->i_mode & S_ISGID)
					args.gid = (__u64) inode->i_gid;
				else
					args.gid = (__u64) current->fsgid;
			} else {
				args.uid = NO_CHANGE_64;
				args.gid = NO_CHANGE_64;
			}
			CIFSSMBUnixSetInfo(xid, pTcon, full_path, &args,
				cifs_sb->local_nls,
				cifs_sb->mnt_cifs_flags &
					CIFS_MOUNT_MAP_SPECIAL_CHR);
		} else {
			/* BB implement mode setting via Windows security
			   descriptors e.g. */
			/* CIFSSMBWinSetPerms(xid,pTcon,path,mode,-1,-1,nls);*/

			/* Could set r/o dos attribute if mode & 0222 == 0 */
		}

		/* server might mask mode so we have to query for it */
		if (pTcon->unix_ext)
			rc = cifs_get_inode_info_unix(&newinode, full_path,
						 inode->i_sb, xid);
		else {
			rc = cifs_get_inode_info(&newinode, full_path,
						 buf, inode->i_sb, xid,
						 &fileHandle);
			if (newinode) {
				if (cifs_sb->mnt_cifs_flags &
				    CIFS_MOUNT_DYNPERM)
					newinode->i_mode = mode;
				if ((oplock & CIFS_CREATE_ACTION) &&
				    (cifs_sb->mnt_cifs_flags &
				     CIFS_MOUNT_SET_UID)) {
					newinode->i_uid = current->fsuid;
					if (inode->i_mode & S_ISGID)
						newinode->i_gid =
							inode->i_gid;
					else
						newinode->i_gid =
							current->fsgid;
				}
			}
		}

		if (rc != 0) {
			cFYI(1,
			     ("Create worked but get_inode_info failed rc = %d",
			      rc));
		} else {
			if (pTcon->nocase)
				direntry->d_op = &cifs_ci_dentry_ops;
			else
				direntry->d_op = &cifs_dentry_ops;
			d_instantiate(direntry, newinode);
		}
		if ((nd == NULL /* nfsd case - nfs srv does not set nd */) ||
			(!(nd->flags & LOOKUP_OPEN))) {
			/* mknod case - do not leave file open */
			CIFSSMBClose(xid, pTcon, fileHandle);
		} else if (newinode) {
			pCifsFile =
			   kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);

			if (pCifsFile == NULL)
				goto cifs_create_out;
			pCifsFile->netfid = fileHandle;
			pCifsFile->pid = current->tgid;
			pCifsFile->pInode = newinode;
			pCifsFile->invalidHandle = false;
			pCifsFile->closePend     = false;
			init_MUTEX(&pCifsFile->fh_sem);
			mutex_init(&pCifsFile->lock_mutex);
			INIT_LIST_HEAD(&pCifsFile->llist);
			atomic_set(&pCifsFile->wrtPending, 0);

			/* set the following in open now
				pCifsFile->pfile = file; */
			write_lock(&GlobalSMBSeslock);
			list_add(&pCifsFile->tlist, &pTcon->openFileList);
			pCifsInode = CIFS_I(newinode);
			if (pCifsInode) {
				/* if readable file instance put first in list*/
				if (write_only) {
					list_add_tail(&pCifsFile->flist,
						&pCifsInode->openFileList);
				} else {
					list_add(&pCifsFile->flist,
						&pCifsInode->openFileList);
				}
				if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) {
					pCifsInode->clientCanCacheAll = true;
					pCifsInode->clientCanCacheRead = true;
					cFYI(1, ("Exclusive Oplock inode %p",
						newinode));
				} else if ((oplock & 0xF) == OPLOCK_READ)
					pCifsInode->clientCanCacheRead = true;
			}
			write_unlock(&GlobalSMBSeslock);
		}
	}
cifs_create_out:
	kfree(buf);
	kfree(full_path);
	FreeXid(xid);
	return rc;
}
Exemplo n.º 15
0
static int decode_sfu_inode(struct inode * inode, __u64 size,
			    const unsigned char *path,
			    struct cifs_sb_info *cifs_sb, int xid)
{
	int rc;
	int oplock = FALSE;
	__u16 netfid;
	struct cifsTconInfo *pTcon = cifs_sb->tcon;
	char buf[24];
	unsigned int bytes_read;
	char * pbuf;

	pbuf = buf;

	if(size == 0) {
		inode->i_mode |= S_IFIFO;
		return 0;
	} else if (size < 8) {
		return -EINVAL;	 /* EOPNOTSUPP? */
	}
		
	rc = CIFSSMBOpen(xid, pTcon, path, FILE_OPEN, GENERIC_READ,
			 CREATE_NOT_DIR, &netfid, &oplock, NULL,
			 cifs_sb->local_nls,
			 cifs_sb->mnt_cifs_flags &
				CIFS_MOUNT_MAP_SPECIAL_CHR);
	if (rc==0) {
		int buf_type = CIFS_NO_BUFFER;
			/* Read header */
		rc = CIFSSMBRead(xid, pTcon,
			         netfid,
				 24 /* length */, 0 /* offset */,
				 &bytes_read, &pbuf, &buf_type);
		if((rc == 0) && (bytes_read >= 8)) {
			if(memcmp("IntxBLK", pbuf, 8) == 0) {
				cFYI(1,("Block device"));
				inode->i_mode |= S_IFBLK;
				if(bytes_read == 24) {
					/* we have enough to decode dev num */
					__u64 mjr; /* major */
					__u64 mnr; /* minor */
					mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
					mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
					inode->i_rdev = MKDEV(mjr, mnr);
				}
			} else if(memcmp("IntxCHR", pbuf, 8) == 0) {
				cFYI(1,("Char device"));
				inode->i_mode |= S_IFCHR;
				if(bytes_read == 24) {
					/* we have enough to decode dev num */
					__u64 mjr; /* major */
					__u64 mnr; /* minor */
					mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
					mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
					inode->i_rdev = MKDEV(mjr, mnr);
                                }
			} else if(memcmp("IntxLNK", pbuf, 7) == 0) {
				cFYI(1,("Symlink"));
				inode->i_mode |= S_IFLNK;
			} else {
				inode->i_mode |= S_IFREG; /* file? */
				rc = -EOPNOTSUPP; 
			}
		} else {
			inode->i_mode |= S_IFREG; /* then it is a file */
			rc = -EOPNOTSUPP; /* or some unknown SFU type */	
		}		
		CIFSSMBClose(xid, pTcon, netfid);
	}
	return rc;
	
}
Exemplo n.º 16
0
int cifs_unlink(struct inode *inode, struct dentry *direntry)
{
	int rc = 0;
	int xid;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	char *full_path = NULL;
	struct cifsInodeInfo *cifsInode;
	FILE_BASIC_INFO *pinfo_buf;

	cFYI(1, (" cifs_unlink, inode = 0x%p with ", inode));

	xid = GetXid();

	cifs_sb = CIFS_SB(inode->i_sb);
	pTcon = cifs_sb->tcon;

	/* Unlink can be called from rename so we can not grab the sem here
	   since we deadlock otherwise */
/*	down(&direntry->d_sb->s_vfs_rename_sem);*/
	full_path = build_path_from_dentry(direntry);
/*	up(&direntry->d_sb->s_vfs_rename_sem);*/
	if (full_path == NULL) {
		FreeXid(xid);
		return -ENOMEM;
	}
	rc = CIFSSMBDelFile(xid, pTcon, full_path, cifs_sb->local_nls,
			cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);

	if (!rc) {
		if (direntry->d_inode)
			direntry->d_inode->i_nlink--;
	} else if (rc == -ENOENT) {
		d_drop(direntry);
	} else if (rc == -ETXTBSY) {
		int oplock = FALSE;
		__u16 netfid;

		rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, DELETE,
				 CREATE_NOT_DIR | CREATE_DELETE_ON_CLOSE,
				 &netfid, &oplock, NULL, cifs_sb->local_nls,
				 cifs_sb->mnt_cifs_flags & 
					CIFS_MOUNT_MAP_SPECIAL_CHR);
		if (rc==0) {
			CIFSSMBRenameOpenFile(xid, pTcon, netfid, NULL,
					      cifs_sb->local_nls, 
					      cifs_sb->mnt_cifs_flags & 
						CIFS_MOUNT_MAP_SPECIAL_CHR);
			CIFSSMBClose(xid, pTcon, netfid);
			if (direntry->d_inode)
				direntry->d_inode->i_nlink--;
		}
	} else if (rc == -EACCES) {
		/* try only if r/o attribute set in local lookup data? */
		pinfo_buf = kmalloc(sizeof(FILE_BASIC_INFO), GFP_KERNEL);
		if (pinfo_buf) {
			memset(pinfo_buf, 0, sizeof(FILE_BASIC_INFO));
			/* ATTRS set to normal clears r/o bit */
			pinfo_buf->Attributes = cpu_to_le32(ATTR_NORMAL);
			if (!(pTcon->ses->flags & CIFS_SES_NT4))
				rc = CIFSSMBSetTimes(xid, pTcon, full_path,
						     pinfo_buf,
						     cifs_sb->local_nls,
						     cifs_sb->mnt_cifs_flags & 
							CIFS_MOUNT_MAP_SPECIAL_CHR);
			else
				rc = -EOPNOTSUPP;

			if (rc == -EOPNOTSUPP) {
				int oplock = FALSE;
				__u16 netfid;
			/*	rc = CIFSSMBSetAttrLegacy(xid, pTcon,
							  full_path,
							  (__u16)ATTR_NORMAL,
							  cifs_sb->local_nls); 
			   For some strange reason it seems that NT4 eats the
			   old setattr call without actually setting the
			   attributes so on to the third attempted workaround
			   */

			/* BB could scan to see if we already have it open
			   and pass in pid of opener to function */
				rc = CIFSSMBOpen(xid, pTcon, full_path,
						 FILE_OPEN, SYNCHRONIZE |
						 FILE_WRITE_ATTRIBUTES, 0,
						 &netfid, &oplock, NULL,
						 cifs_sb->local_nls,
						 cifs_sb->mnt_cifs_flags & 
						    CIFS_MOUNT_MAP_SPECIAL_CHR);
				if (rc==0) {
					rc = CIFSSMBSetFileTimes(xid, pTcon,
								 pinfo_buf,
								 netfid);
					CIFSSMBClose(xid, pTcon, netfid);
				}
			}
			kfree(pinfo_buf);
		}
		if (rc==0) {
			rc = CIFSSMBDelFile(xid, pTcon, full_path, 
					    cifs_sb->local_nls, 
					    cifs_sb->mnt_cifs_flags & 
						CIFS_MOUNT_MAP_SPECIAL_CHR);
			if (!rc) {
				if (direntry->d_inode)
					direntry->d_inode->i_nlink--;
			} else if (rc == -ETXTBSY) {
				int oplock = FALSE;
				__u16 netfid;

				rc = CIFSSMBOpen(xid, pTcon, full_path,
						 FILE_OPEN, DELETE,
						 CREATE_NOT_DIR |
						 CREATE_DELETE_ON_CLOSE,
						 &netfid, &oplock, NULL,
						 cifs_sb->local_nls, 
						 cifs_sb->mnt_cifs_flags & 
						    CIFS_MOUNT_MAP_SPECIAL_CHR);
				if (rc==0) {
					CIFSSMBRenameOpenFile(xid, pTcon,
						netfid, NULL,
						cifs_sb->local_nls,
						cifs_sb->mnt_cifs_flags &
						    CIFS_MOUNT_MAP_SPECIAL_CHR);
					CIFSSMBClose(xid, pTcon, netfid);
					if (direntry->d_inode)
			                        direntry->d_inode->i_nlink--;
				}
			/* BB if rc = -ETXTBUSY goto the rename logic BB */
			}
		}
	}
	if (direntry->d_inode) {
		cifsInode = CIFS_I(direntry->d_inode);
		cifsInode->time = 0;	/* will force revalidate to get info
					   when needed */
		direntry->d_inode->i_ctime = current_fs_time(inode->i_sb);
	}
	inode->i_ctime = inode->i_mtime = current_fs_time(inode->i_sb);
	cifsInode = CIFS_I(inode);
	cifsInode->time = 0;	/* force revalidate of dir as well */

	kfree(full_path);
	FreeXid(xid);
	return rc;
}
Exemplo n.º 17
0
int
cifs_create(struct inode *inode, struct dentry *direntry, int mode,
		struct nameidata *nd)
{
	int rc = -ENOENT;
	int xid;
	int create_options = CREATE_NOT_DIR;
	__u32 oplock = 0;
	int oflags;
	/*
	 * BB below access is probably too much for mknod to request
	 *    but we have to do query and setpathinfo so requesting
	 *    less could fail (unless we want to request getatr and setatr
	 *    permissions (only).  At least for POSIX we do not have to
	 *    request so much.
	 */
	int desiredAccess = GENERIC_READ | GENERIC_WRITE;
	__u16 fileHandle;
	struct cifs_sb_info *cifs_sb;
	struct tcon_link *tlink;
	struct cifs_tcon *tcon;
	char *full_path = NULL;
	FILE_ALL_INFO *buf = NULL;
	struct inode *newinode = NULL;
	int disposition = FILE_OVERWRITE_IF;

	xid = GetXid();

	cifs_sb = CIFS_SB(inode->i_sb);
	tlink = cifs_sb_tlink(cifs_sb);
	if (IS_ERR(tlink)) {
		FreeXid(xid);
		return PTR_ERR(tlink);
	}
	tcon = tlink_tcon(tlink);

	if (oplockEnabled)
		oplock = REQ_OPLOCK;

	if (nd)
		oflags = nd->intent.open.file->f_flags;
	else
		oflags = O_RDONLY | O_CREAT;

	full_path = build_path_from_dentry(direntry);
	if (full_path == NULL) {
		rc = -ENOMEM;
		goto cifs_create_out;
	}

	if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) &&
	    (CIFS_UNIX_POSIX_PATH_OPS_CAP &
			le64_to_cpu(tcon->fsUnixInfo.Capability))) {
		rc = cifs_posix_open(full_path, &newinode,
			inode->i_sb, mode, oflags, &oplock, &fileHandle, xid);
		/* EIO could indicate that (posix open) operation is not
		   supported, despite what server claimed in capability
		   negotiation.  EREMOTE indicates DFS junction, which is not
		   handled in posix open */

		if (rc == 0) {
			if (newinode == NULL) /* query inode info */
				goto cifs_create_get_file_info;
			else /* success, no need to query */
				goto cifs_create_set_dentry;
		} else if ((rc != -EIO) && (rc != -EREMOTE) &&
			 (rc != -EOPNOTSUPP) && (rc != -EINVAL))
			goto cifs_create_out;
		/* else fallthrough to retry, using older open call, this is
		   case where server does not support this SMB level, and
		   falsely claims capability (also get here for DFS case
		   which should be rare for path not covered on files) */
	}

	if (nd) {
		/* if the file is going to stay open, then we
		   need to set the desired access properly */
		desiredAccess = 0;
		if (OPEN_FMODE(oflags) & FMODE_READ)
			desiredAccess |= GENERIC_READ; /* is this too little? */
		if (OPEN_FMODE(oflags) & FMODE_WRITE)
			desiredAccess |= GENERIC_WRITE;

		if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
			disposition = FILE_CREATE;
		else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
			disposition = FILE_OVERWRITE_IF;
		else if ((oflags & O_CREAT) == O_CREAT)
			disposition = FILE_OPEN_IF;
		else
			cFYI(1, "Create flag not set in create function");
	}

	/* BB add processing to set equivalent of mode - e.g. via CreateX with
	   ACLs */

	buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
	if (buf == NULL) {
		rc = -ENOMEM;
		goto cifs_create_out;
	}

	/*
	 * if we're not using unix extensions, see if we need to set
	 * ATTR_READONLY on the create call
	 */
	if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
		create_options |= CREATE_OPTION_READONLY;

	if (tcon->ses->capabilities & CAP_NT_SMBS)
		rc = CIFSSMBOpen(xid, tcon, full_path, disposition,
			 desiredAccess, create_options,
			 &fileHandle, &oplock, buf, cifs_sb->local_nls,
			 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	else
		rc = -EIO; /* no NT SMB support fall into legacy open below */

	if (rc == -EIO) {
		/* old server, retry the open legacy style */
		rc = SMBLegacyOpen(xid, tcon, full_path, disposition,
			desiredAccess, create_options,
			&fileHandle, &oplock, buf, cifs_sb->local_nls,
			cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	}
	if (rc) {
		cFYI(1, "cifs_create returned 0x%x", rc);
		goto cifs_create_out;
	}

	/* If Open reported that we actually created a file
	   then we now have to set the mode if possible */
	if ((tcon->unix_ext) && (oplock & CIFS_CREATE_ACTION)) {
		struct cifs_unix_set_info_args args = {
				.mode	= mode,
				.ctime	= NO_CHANGE_64,
				.atime	= NO_CHANGE_64,
				.mtime	= NO_CHANGE_64,
				.device	= 0,
		};

		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
			args.uid = (__u64) current_fsuid();
			if (inode->i_mode & S_ISGID)
				args.gid = (__u64) inode->i_gid;
			else
				args.gid = (__u64) current_fsgid();
		} else {
			args.uid = NO_CHANGE_64;
			args.gid = NO_CHANGE_64;
		}
		CIFSSMBUnixSetFileInfo(xid, tcon, &args, fileHandle,
					current->tgid);
	} else {
		/* BB implement mode setting via Windows security
		   descriptors e.g. */
		/* CIFSSMBWinSetPerms(xid,tcon,path,mode,-1,-1,nls);*/

		/* Could set r/o dos attribute if mode & 0222 == 0 */
	}

cifs_create_get_file_info:
	/* server might mask mode so we have to query for it */
	if (tcon->unix_ext)
		rc = cifs_get_inode_info_unix(&newinode, full_path,
					      inode->i_sb, xid);
	else {
		rc = cifs_get_inode_info(&newinode, full_path, buf,
					 inode->i_sb, xid, &fileHandle);
		if (newinode) {
			if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
				newinode->i_mode = mode;
			if ((oplock & CIFS_CREATE_ACTION) &&
			    (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)) {
				newinode->i_uid = current_fsuid();
				if (inode->i_mode & S_ISGID)
					newinode->i_gid = inode->i_gid;
				else
					newinode->i_gid = current_fsgid();
			}
		}
	}

cifs_create_set_dentry:
	if (rc == 0)
		d_instantiate(direntry, newinode);
	else
		cFYI(1, "Create worked, get_inode_info failed rc = %d", rc);

	if (newinode && nd) {
		struct cifsFileInfo *pfile_info;
		struct file *filp;

		filp = lookup_instantiate_filp(nd, direntry, generic_file_open);
		if (IS_ERR(filp)) {
			rc = PTR_ERR(filp);
			CIFSSMBClose(xid, tcon, fileHandle);
			goto cifs_create_out;
		}

		pfile_info = cifs_new_fileinfo(fileHandle, filp, tlink, oplock);
		if (pfile_info == NULL) {
			fput(filp);
			CIFSSMBClose(xid, tcon, fileHandle);
			rc = -ENOMEM;
		}
	} else {
		CIFSSMBClose(xid, tcon, fileHandle);
	}

cifs_create_out:
	kfree(buf);
	kfree(full_path);
	cifs_put_tlink(tlink);
	FreeXid(xid);
	return rc;
}
Exemplo n.º 18
0
int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode,
		dev_t device_number)
{
	int rc = -EPERM;
	int xid;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	char *full_path = NULL;
	struct inode *newinode = NULL;
	int oplock = 0;
	u16 fileHandle;
	FILE_ALL_INFO *buf = NULL;
	unsigned int bytes_written;
	struct win_dev *pdev;

	if (!old_valid_dev(device_number))
		return -EINVAL;

	xid = GetXid();

	cifs_sb = CIFS_SB(inode->i_sb);
	pTcon = cifs_sb->tcon;

	full_path = build_path_from_dentry(direntry);
	if (full_path == NULL) {
		rc = -ENOMEM;
		goto mknod_out;
	}

	if (pTcon->unix_ext) {
		struct cifs_unix_set_info_args args = {
			.mode	= mode & ~current_umask(),
			.ctime	= NO_CHANGE_64,
			.atime	= NO_CHANGE_64,
			.mtime	= NO_CHANGE_64,
			.device	= device_number,
		};
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
			args.uid = (__u64) current_fsuid();
			args.gid = (__u64) current_fsgid();
		} else {
			args.uid = NO_CHANGE_64;
			args.gid = NO_CHANGE_64;
		}
		rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, &args,
					    cifs_sb->local_nls,
					    cifs_sb->mnt_cifs_flags &
						CIFS_MOUNT_MAP_SPECIAL_CHR);
		if (rc)
			goto mknod_out;

		rc = cifs_get_inode_info_unix(&newinode, full_path,
						inode->i_sb, xid);
		if (pTcon->nocase)
			direntry->d_op = &cifs_ci_dentry_ops;
		else
			direntry->d_op = &cifs_dentry_ops;

		if (rc == 0)
			d_instantiate(direntry, newinode);
		goto mknod_out;
	}

	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
		goto mknod_out;


	cFYI(1, "sfu compat create special file");

	buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
	if (buf == NULL) {
		kfree(full_path);
		rc = -ENOMEM;
		FreeXid(xid);
		return rc;
	}

	rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_CREATE,
			 GENERIC_WRITE, CREATE_NOT_DIR | CREATE_OPTION_SPECIAL,
			 &fileHandle, &oplock, buf, cifs_sb->local_nls,
			 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	if (rc)
		goto mknod_out;

	/* BB Do not bother to decode buf since no local inode yet to put
	 * timestamps in, but we can reuse it safely */

	pdev = (struct win_dev *)buf;
	if (S_ISCHR(mode)) {
		memcpy(pdev->type, "IntxCHR", 8);
		pdev->major =
		      cpu_to_le64(MAJOR(device_number));
		pdev->minor =
		      cpu_to_le64(MINOR(device_number));
		rc = CIFSSMBWrite(xid, pTcon,
			fileHandle,
			sizeof(struct win_dev),
			0, &bytes_written, (char *)pdev,
			NULL, 0);
	} else if (S_ISBLK(mode)) {
		memcpy(pdev->type, "IntxBLK", 8);
		pdev->major =
		      cpu_to_le64(MAJOR(device_number));
		pdev->minor =
		      cpu_to_le64(MINOR(device_number));
		rc = CIFSSMBWrite(xid, pTcon,
			fileHandle,
			sizeof(struct win_dev),
			0, &bytes_written, (char *)pdev,
			NULL, 0);
	} /* else if (S_ISFIFO) */
	CIFSSMBClose(xid, pTcon, fileHandle);
	d_drop(direntry);


mknod_out:
	kfree(full_path);
	kfree(buf);
	FreeXid(xid);
	return rc;
}
Exemplo n.º 19
0
int
cifs_unlink(struct inode *inode, struct dentry *direntry)
{
	int rc = 0;
	int xid;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	char *full_path = NULL;
	struct cifsInodeInfo *cifsInode;
	FILE_BASIC_INFO * pinfo_buf;

	cFYI(1, (" cifs_unlink, inode = 0x%p with ", inode));

	xid = GetXid();

	cifs_sb = CIFS_SB(inode->i_sb);
	pTcon = cifs_sb->tcon;

/* Unlink can be called from rename so we can not grab
	the sem here since we deadlock otherwise */
/*	down(&direntry->d_sb->s_vfs_rename_sem);*/
	full_path = build_path_from_dentry(direntry);
/*	up(&direntry->d_sb->s_vfs_rename_sem);*/
	if(full_path == NULL) {
		FreeXid(xid);
		return -ENOMEM;
	}
	rc = CIFSSMBDelFile(xid, pTcon, full_path, cifs_sb->local_nls);

	if (!rc) {
		direntry->d_inode->i_nlink--;
	} else if (rc == -ENOENT) {
		d_drop(direntry);
	} else if (rc == -ETXTBSY) {
		int oplock = FALSE;
		__u16 netfid;

		rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, DELETE, 
				CREATE_NOT_DIR | CREATE_DELETE_ON_CLOSE,
				&netfid, &oplock, NULL, cifs_sb->local_nls);
		if(rc==0) {
			CIFSSMBRenameOpenFile(xid,pTcon,netfid,
				NULL, cifs_sb->local_nls);
			CIFSSMBClose(xid, pTcon, netfid);
			direntry->d_inode->i_nlink--;
		}
	} else if (rc == -EACCES) {
		/* try only if r/o attribute set in local lookup data? */
		pinfo_buf = (FILE_BASIC_INFO *)kmalloc(sizeof(FILE_BASIC_INFO),GFP_KERNEL);
		if(pinfo_buf) {
			memset(pinfo_buf,0,sizeof(FILE_BASIC_INFO));        
		/* ATTRS set to normal clears r/o bit */
			pinfo_buf->Attributes = cpu_to_le32(ATTR_NORMAL);
			rc = CIFSSMBSetTimes(xid, pTcon, full_path, pinfo_buf,
				cifs_sb->local_nls);
			kfree(pinfo_buf);
		}
		if(rc==0) {
			rc = CIFSSMBDelFile(xid, pTcon, full_path, cifs_sb->local_nls);
			if (!rc) {
				direntry->d_inode->i_nlink--;
			} else if (rc == -ETXTBSY) {
				int oplock = FALSE;
				__u16 netfid;

				rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, DELETE,
						CREATE_NOT_DIR | CREATE_DELETE_ON_CLOSE,
						&netfid, &oplock, NULL, cifs_sb->local_nls);
				if(rc==0) {
					CIFSSMBRenameOpenFile(xid,pTcon,netfid,NULL,cifs_sb->local_nls);
					CIFSSMBClose(xid, pTcon, netfid);
		                        direntry->d_inode->i_nlink--;
				}
			/* BB if rc = -ETXTBUSY goto the rename logic BB */
			}
		}
	}
	cifsInode = CIFS_I(direntry->d_inode);
	cifsInode->time = 0;	/* will force revalidate to get info when needed */
	direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
	    CURRENT_TIME;
	cifsInode = CIFS_I(inode);
	cifsInode->time = 0;	/* force revalidate of dir as well */

	if (full_path)
		kfree(full_path);
	FreeXid(xid);
	return rc;
}
Exemplo n.º 20
0
int
cifs_rename(struct inode *source_inode, struct dentry *source_direntry,
	    struct inode *target_inode, struct dentry *target_direntry)
{
	char *fromName;
	char *toName;
	struct cifs_sb_info *cifs_sb_source;
	struct cifs_sb_info *cifs_sb_target;
	struct cifsTconInfo *pTcon;
	int xid;
	int rc = 0;

	xid = GetXid();

	cifs_sb_target = CIFS_SB(target_inode->i_sb);
	cifs_sb_source = CIFS_SB(source_inode->i_sb);
	pTcon = cifs_sb_source->tcon;

	if (pTcon != cifs_sb_target->tcon) {
		FreeXid(xid);    
		return -EXDEV;	/* BB actually could be allowed if same server, but
                     different share. Might eventually add support for this */
	}

	/* we already  have the rename sem so we do not need
	to grab it again here to protect the path integrity */
	fromName = build_path_from_dentry(source_direntry);
	toName = build_path_from_dentry(target_direntry);
	if((fromName == NULL) || (toName == NULL)) {
		rc = -ENOMEM;
		goto cifs_rename_exit;
	}

	rc = CIFSSMBRename(xid, pTcon, fromName, toName,
			   cifs_sb_source->local_nls);
	if(rc == -EEXIST) {
		/* check if they are the same file 
		because rename of hardlinked files is a noop */
		FILE_UNIX_BASIC_INFO * info_buf_source;
		FILE_UNIX_BASIC_INFO * info_buf_target;

		info_buf_source = 
			kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO),GFP_KERNEL);
		if(info_buf_source != NULL) {
			info_buf_target = info_buf_source+1;
			rc = CIFSSMBUnixQPathInfo(xid, pTcon, fromName, 
				info_buf_source, cifs_sb_source->local_nls);
			if(rc == 0) {
				rc = CIFSSMBUnixQPathInfo(xid,pTcon,toName,
						info_buf_target,
						cifs_sb_target->local_nls);
			}
			if((rc == 0) && 
				(info_buf_source->UniqueId == 
				 info_buf_target->UniqueId)) {
			/* do not rename since the files are hardlinked 
			   which is a noop */
			} else {
			/* we either can not tell the files are hardlinked
			(as with Windows servers) or files are not hardlinked 
			so delete the target manually before renaming to
			follow POSIX rather than Windows semantics */
				cifs_unlink(target_inode, target_direntry);
				rc = CIFSSMBRename(xid, pTcon, fromName, toName,
					cifs_sb_source->local_nls);
			}
			kfree(info_buf_source);
		} /* if we can not get memory just leave rc as EEXIST */
	}

	if((rc == -EIO)||(rc == -EEXIST)) {
		int oplock = FALSE;
		__u16 netfid;

		rc = CIFSSMBOpen(xid, pTcon, fromName, FILE_OPEN, GENERIC_READ,
					CREATE_NOT_DIR,
					&netfid, &oplock, NULL, cifs_sb_source->local_nls);
		if(rc==0) {
			CIFSSMBRenameOpenFile(xid,pTcon,netfid,
					toName, cifs_sb_source->local_nls);
			CIFSSMBClose(xid, pTcon, netfid);
		}
	}

cifs_rename_exit:
	if (fromName)
		kfree(fromName);
	if (toName)
		kfree(toName);

	FreeXid(xid);
	return rc;
}
Exemplo n.º 21
0
int
cifs_readlink(struct dentry *direntry, char __user *pBuffer, int buflen)
{
	struct inode *inode = direntry->d_inode;
	int rc = -EACCES;
	int xid;
	int oplock = 0;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	char *full_path = NULL;
	char *tmpbuffer;
	int len;
	__u16 fid;

	xid = GetXid();
	cifs_sb = CIFS_SB(inode->i_sb);
	pTcon = cifs_sb->tcon;

/* BB would it be safe against deadlock to grab this sem
      even though rename itself grabs the sem and calls lookup? */
/*       mutex_lock(&inode->i_sb->s_vfs_rename_mutex);*/
	full_path = build_path_from_dentry(direntry);
/*       mutex_unlock(&inode->i_sb->s_vfs_rename_mutex);*/

	if (full_path == NULL) {
		FreeXid(xid);
		return -ENOMEM;
	}

	cFYI(1,
	     ("Full path: %s inode = 0x%p pBuffer = 0x%p buflen = %d",
	      full_path, inode, pBuffer, buflen));
	if (buflen > PATH_MAX)
		len = PATH_MAX;
	else
		len = buflen;
	tmpbuffer = kmalloc(len, GFP_KERNEL);
	if (tmpbuffer == NULL) {
		kfree(full_path);
		FreeXid(xid);
		return -ENOMEM;
	}

/* BB add read reparse point symlink code and
	Unix extensions symlink code here BB */
/* We could disable this based on pTcon->unix_ext flag instead ... but why? */
	if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
		rc = CIFSSMBUnixQuerySymLink(xid, pTcon, full_path,
				tmpbuffer,
				len - 1,
				cifs_sb->local_nls);
	else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
		cERROR(1, ("SFU style symlinks not implemented yet"));
		/* add open and read as in fs/cifs/inode.c */
	} else {
		rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, GENERIC_READ, FILE_SHARE_ALL,
				OPEN_REPARSE_POINT, &fid, &oplock, NULL,
				cifs_sb->local_nls,
				cifs_sb->mnt_cifs_flags &
					CIFS_MOUNT_MAP_SPECIAL_CHR);
		if (!rc) {
			rc = CIFSSMBQueryReparseLinkInfo(xid, pTcon, full_path,
				tmpbuffer,
				len - 1,
				fid,
				cifs_sb->local_nls);
			if (CIFSSMBClose(xid, pTcon, fid)) {
				cFYI(1, ("Error closing junction point "
					 "(open for ioctl)"));
			}
			/* If it is a DFS junction earlier we would have gotten
			   PATH_NOT_COVERED returned from server so we do
			   not need to request the DFS info here */
		}
	}
	/* BB Anything else to do to handle recursive links? */
	/* BB Should we be using page ops here? */

	/* BB null terminate returned string in pBuffer? BB */
	if (rc == 0) {
		rc = vfs_readlink(direntry, pBuffer, len, tmpbuffer);
		cFYI(1,
		     ("vfs_readlink called from cifs_readlink returned %d",
		      rc));
	}

	kfree(tmpbuffer);
	kfree(full_path);
	FreeXid(xid);
	return rc;
}
Exemplo n.º 22
0
int
cifs_create(struct inode *inode, struct dentry *direntry, int mode,
		struct nameidata *nd)
{
	int rc = -ENOENT;
	int xid;
	int oplock = 0;
	int desiredAccess = GENERIC_READ | GENERIC_WRITE;
	__u16 fileHandle;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	char *full_path = NULL;
	FILE_ALL_INFO * buf = NULL;
	struct inode *newinode = NULL;
	struct cifsFileInfo * pCifsFile = NULL;
	struct cifsInodeInfo * pCifsInode;
	int disposition = FILE_OVERWRITE_IF;
	int write_only = FALSE;

	xid = GetXid();

	cifs_sb = CIFS_SB(inode->i_sb);
	pTcon = cifs_sb->tcon;

	down(&direntry->d_sb->s_vfs_rename_sem);
	full_path = build_path_from_dentry(direntry);
	up(&direntry->d_sb->s_vfs_rename_sem);
	if(full_path == NULL) {
		FreeXid(xid);
		return -ENOMEM;
	}

	if(nd && (nd->flags & LOOKUP_OPEN)) {
		int oflags = nd->intent.open.flags;

		desiredAccess = 0;
		if (oflags & FMODE_READ)
			desiredAccess |= GENERIC_READ;
		if (oflags & FMODE_WRITE) {
			desiredAccess |= GENERIC_WRITE;
			if (!(oflags & FMODE_READ))
				write_only = TRUE;
		}

		if((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
			disposition = FILE_CREATE;
		else if((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
			disposition = FILE_OVERWRITE_IF;
		else if((oflags & O_CREAT) == O_CREAT)
			disposition = FILE_OPEN_IF;
		else {
			cFYI(1,("Create flag not set in create function"));
		}
	}

	/* BB add processing to set equivalent of mode - e.g. via CreateX with ACLs */
	if (oplockEnabled)
		oplock = REQ_OPLOCK;

	buf = kmalloc(sizeof(FILE_ALL_INFO),GFP_KERNEL);
	if(buf == NULL) {
		kfree(full_path);
		FreeXid(xid);
		return -ENOMEM;
	}

	rc = CIFSSMBOpen(xid, pTcon, full_path, disposition,
			 desiredAccess, CREATE_NOT_DIR,
			 &fileHandle, &oplock, buf, cifs_sb->local_nls,
			 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	if (rc) {
		cFYI(1, ("cifs_create returned 0x%x ", rc));
	} else {
		/* If Open reported that we actually created a file
		then we now have to set the mode if possible */
		if ((cifs_sb->tcon->ses->capabilities & CAP_UNIX) &&
			(oplock & CIFS_CREATE_ACTION))
			if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
				CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
					(__u64)current->euid,
					(__u64)current->egid,
					0 /* dev */,
					cifs_sb->local_nls, 
					cifs_sb->mnt_cifs_flags & 
						CIFS_MOUNT_MAP_SPECIAL_CHR);
			} else {
				CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
					(__u64)-1,
					(__u64)-1,
					0 /* dev */,
					cifs_sb->local_nls,
					cifs_sb->mnt_cifs_flags & 
						CIFS_MOUNT_MAP_SPECIAL_CHR);
			}
		else {
			/* BB implement via Windows security descriptors */
			/* eg CIFSSMBWinSetPerms(xid,pTcon,full_path,mode,-1,-1,local_nls);*/
			/* could set r/o dos attribute if mode & 0222 == 0 */
		}

	/* BB server might mask mode so we have to query for Unix case*/
		if (pTcon->ses->capabilities & CAP_UNIX)
			rc = cifs_get_inode_info_unix(&newinode, full_path,
						 inode->i_sb,xid);
		else {
			rc = cifs_get_inode_info(&newinode, full_path,
						 buf, inode->i_sb,xid);
			if(newinode)
				newinode->i_mode = mode;
		}

		if (rc != 0) {
			cFYI(1,("Create worked but get_inode_info failed with rc = %d",
			      rc));
		} else {
			direntry->d_op = &cifs_dentry_ops;
			d_instantiate(direntry, newinode);
		}
		if((nd->flags & LOOKUP_OPEN) == FALSE) {
			/* mknod case - do not leave file open */
			CIFSSMBClose(xid, pTcon, fileHandle);
		} else if(newinode) {
			pCifsFile =
			   kmalloc(sizeof (struct cifsFileInfo), GFP_KERNEL);
			
			if(pCifsFile == NULL)
				goto cifs_create_out;
			memset((char *)pCifsFile, 0,
			       sizeof (struct cifsFileInfo));
			pCifsFile->netfid = fileHandle;
			pCifsFile->pid = current->tgid;
			pCifsFile->pInode = newinode;
			pCifsFile->invalidHandle = FALSE;
			pCifsFile->closePend     = FALSE;
			init_MUTEX(&pCifsFile->fh_sem);
			/* set the following in open now 
				pCifsFile->pfile = file; */
			write_lock(&GlobalSMBSeslock);
			list_add(&pCifsFile->tlist,&pTcon->openFileList);
			pCifsInode = CIFS_I(newinode);
			if(pCifsInode) {
				/* if readable file instance put first in list*/
				if (write_only == TRUE) {
                                       	list_add_tail(&pCifsFile->flist,
						&pCifsInode->openFileList);
				} else {
					list_add(&pCifsFile->flist,
						&pCifsInode->openFileList);
				}
				if((oplock & 0xF) == OPLOCK_EXCLUSIVE) {
					pCifsInode->clientCanCacheAll = TRUE;
					pCifsInode->clientCanCacheRead = TRUE;
					cFYI(1,("Exclusive Oplock for inode %p",
						newinode));
				} else if((oplock & 0xF) == OPLOCK_READ)
					pCifsInode->clientCanCacheRead = TRUE;
			}
			write_unlock(&GlobalSMBSeslock);
		}
	} 
cifs_create_out:
	kfree(buf);
	kfree(full_path);
	FreeXid(xid);
	return rc;
}
Exemplo n.º 23
0
static int
cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid,
	       struct tcon_link *tlink, unsigned oflags, umode_t mode,
	       __u32 *oplock, __u16 *fileHandle, int *created)
{
	int rc = -ENOENT;
	int create_options = CREATE_NOT_DIR;
	int desiredAccess;
	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
	struct cifs_tcon *tcon = tlink_tcon(tlink);
	char *full_path = NULL;
	FILE_ALL_INFO *buf = NULL;
	struct inode *newinode = NULL;
	int disposition;
	int share_access = FILE_SHARE_ALL;

	*oplock = 0;
	if (tcon->ses->server->oplocks)
		*oplock = REQ_OPLOCK;

	full_path = build_path_from_dentry(direntry);
	if (full_path == NULL) {
		rc = -ENOMEM;
		goto out;
	}

	if (tcon->unix_ext && cap_unix(tcon->ses) && !tcon->broken_posix_open &&
	    ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0) &&
	    (CIFS_UNIX_POSIX_PATH_OPS_CAP &
			le64_to_cpu(tcon->fsUnixInfo.Capability))) {
		rc = cifs_posix_open(full_path, &newinode,
			inode->i_sb, mode, oflags, oplock, fileHandle, xid);
		switch (rc) {
		case 0:
			if (newinode == NULL) {
				/* query inode info */
				goto cifs_create_get_file_info;
			}

			if (!S_ISREG(newinode->i_mode)) {
				/*
				 * The server may allow us to open things like
				 * FIFOs, but the client isn't set up to deal
				 * with that. If it's not a regular file, just
				 * close it and proceed as if it were a normal
				 * lookup.
				 */
				CIFSSMBClose(xid, tcon, *fileHandle);
				goto cifs_create_get_file_info;
			}
			/* success, no need to query */
			goto cifs_create_set_dentry;

		case -ENOENT:
			goto cifs_create_get_file_info;

		case -EIO:
		case -EINVAL:
			/*
			 * EIO could indicate that (posix open) operation is not
			 * supported, despite what server claimed in capability
			 * negotiation.
			 *
			 * POSIX open in samba versions 3.3.1 and earlier could
			 * incorrectly fail with invalid parameter.
			 */
			tcon->broken_posix_open = true;
			break;

		case -EREMOTE:
		case -EOPNOTSUPP:
			/*
			 * EREMOTE indicates DFS junction, which is not handled
			 * in posix open.  If either that or op not supported
			 * returned, follow the normal lookup.
			 */
			break;

		default:
			goto out;
		}
		/*
		 * fallthrough to retry, using older open call, this is case
		 * where server does not support this SMB level, and falsely
		 * claims capability (also get here for DFS case which should be
		 * rare for path not covered on files)
		 */
	}

	desiredAccess = 0;
	if (OPEN_FMODE(oflags) & FMODE_READ)
		desiredAccess |= GENERIC_READ; /* is this too little? */
	if (OPEN_FMODE(oflags) & FMODE_WRITE)
		desiredAccess |= GENERIC_WRITE;

	disposition = FILE_OVERWRITE_IF;
	if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
		disposition = FILE_CREATE;
	else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
		disposition = FILE_OVERWRITE_IF;
	else if ((oflags & O_CREAT) == O_CREAT)
		disposition = FILE_OPEN_IF;
	else
		cFYI(1, "Create flag not set in create function");

	share_access = cifs_get_share_flags(oflags);

	/* BB add processing to set equivalent of mode - e.g. via CreateX with
	   ACLs */

	buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
	if (buf == NULL) {
		rc = -ENOMEM;
		goto out;
	}

	/*
	 * if we're not using unix extensions, see if we need to set
	 * ATTR_READONLY on the create call
	 */
	if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
		create_options |= CREATE_OPTION_READONLY;

	if (backup_cred(cifs_sb))
		create_options |= CREATE_OPEN_BACKUP_INTENT;

	if (tcon->ses->capabilities & CAP_NT_SMBS)
		rc = CIFSSMBOpen(xid, tcon, full_path, disposition,
			 desiredAccess, share_access, create_options,
			 fileHandle, oplock, buf, cifs_sb->local_nls,
			 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	else
		rc = -EIO; /* no NT SMB support fall into legacy open below */

	if (rc == -EIO) {
		/* old server, retry the open legacy style */
		rc = SMBLegacyOpen(xid, tcon, full_path, disposition,
			desiredAccess, create_options,
			fileHandle, oplock, buf, cifs_sb->local_nls,
			cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	}
	if (rc) {
		cFYI(1, "cifs_create returned 0x%x", rc);
		goto out;
	}

	/* If Open reported that we actually created a file
	   then we now have to set the mode if possible */
	if ((tcon->unix_ext) && (*oplock & CIFS_CREATE_ACTION)) {
		struct cifs_unix_set_info_args args = {
				.mode	= mode,
				.ctime	= NO_CHANGE_64,
				.atime	= NO_CHANGE_64,
				.mtime	= NO_CHANGE_64,
				.device	= 0,
		};

		*created |= FILE_CREATED;
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
			args.uid = (__u64) current_fsuid();
			if (inode->i_mode & S_ISGID)
				args.gid = (__u64) inode->i_gid;
			else
				args.gid = (__u64) current_fsgid();
		} else {
			args.uid = NO_CHANGE_64;
			args.gid = NO_CHANGE_64;
		}
		CIFSSMBUnixSetFileInfo(xid, tcon, &args, *fileHandle,
					current->tgid);
	} else {
		/* BB implement mode setting via Windows security
		   descriptors e.g. */
		/* CIFSSMBWinSetPerms(xid,tcon,path,mode,-1,-1,nls);*/

		/* Could set r/o dos attribute if mode & 0222 == 0 */
	}

cifs_create_get_file_info:
	/* server might mask mode so we have to query for it */
	if (tcon->unix_ext)
		rc = cifs_get_inode_info_unix(&newinode, full_path,
					      inode->i_sb, xid);
	else {
		rc = cifs_get_inode_info(&newinode, full_path, buf,
					 inode->i_sb, xid, fileHandle);
		if (newinode) {
			if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
				newinode->i_mode = mode;
			if ((*oplock & CIFS_CREATE_ACTION) &&
			    (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)) {
				newinode->i_uid = current_fsuid();
				if (inode->i_mode & S_ISGID)
					newinode->i_gid = inode->i_gid;
				else
					newinode->i_gid = current_fsgid();
			}
		}
	}

cifs_create_set_dentry:
	if (rc != 0) {
		cFYI(1, "Create worked, get_inode_info failed rc = %d", rc);
		CIFSSMBClose(xid, tcon, *fileHandle);
		goto out;
	}
	d_drop(direntry);
	d_add(direntry, newinode);

out:
	kfree(buf);
	kfree(full_path);
	return rc;
}
int
CVE_2010_1148_linux2_6_29_cifs_create(struct inode *inode, struct dentry *direntry, int mode,
		struct nameidata *nd)
{
	int rc = -ENOENT;
	int xid;
	int create_options = CREATE_NOT_DIR;
	int oplock = 0;
	int oflags;
	/*
	 * BB below access is probably too much for mknod to request
	 *    but we have to do query and setpathinfo so requesting
	 *    less could fail (unless we want to request getatr and setatr
	 *    permissions (only).  At least for POSIX we do not have to
	 *    request so much.
	 */
	int desiredAccess = GENERIC_READ | GENERIC_WRITE;
	__u16 fileHandle;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *tcon;
	char *full_path = NULL;
	FILE_ALL_INFO *buf = NULL;
	struct inode *newinode = NULL;
	struct cifsInodeInfo *pCifsInode;
	int disposition = FILE_OVERWRITE_IF;
	bool write_only = false;

	xid = GetXid();

	cifs_sb = CIFS_SB(inode->i_sb);
	tcon = cifs_sb->tcon;

	full_path = build_path_from_dentry(direntry);
	if (full_path == NULL) {
		FreeXid(xid);
		return -ENOMEM;
	}

	mode &= ~current->fs->umask;
	if (oplockEnabled)
		oplock = REQ_OPLOCK;

	if (nd && (nd->flags & LOOKUP_OPEN))
		oflags = nd->intent.open.flags;
	else
		oflags = FMODE_READ;

	if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) &&
	    (CIFS_UNIX_POSIX_PATH_OPS_CAP &
			le64_to_cpu(tcon->fsUnixInfo.Capability))) {
		rc = cifs_posix_open(full_path, &newinode, inode->i_sb,
				     mode, oflags, &oplock, &fileHandle, xid);
		/* EIO could indicate that (posix open) operation is not
		   supported, despite what server claimed in capability
		   negotation.  EREMOTE indicates DFS junction, which is not
		   handled in posix open */

		if ((rc == 0) && (newinode == NULL))
			goto CVE_2010_1148_linux2_6_29_cifs_create_get_file_info; /* query inode info */
		else if (rc == 0) /* success, no need to query */
			goto CVE_2010_1148_linux2_6_29_cifs_create_set_dentry;
		else if ((rc != -EIO) && (rc != -EREMOTE) &&
			 (rc != -EOPNOTSUPP)) /* path not found or net err */
			goto CVE_2010_1148_linux2_6_29_cifs_create_out;
		/* else fallthrough to retry, using older open call, this is
		   case where server does not support this SMB level, and
		   falsely claims capability (also get here for DFS case
		   which should be rare for path not covered on files) */
	}

	if (nd && (nd->flags & LOOKUP_OPEN)) {
		/* if the file is going to stay open, then we
		   need to set the desired access properly */
		desiredAccess = 0;
		if (oflags & FMODE_READ)
			desiredAccess |= GENERIC_READ; /* is this too little? */
		if (oflags & FMODE_WRITE) {
			desiredAccess |= GENERIC_WRITE;
			if (!(oflags & FMODE_READ))
				write_only = true;
		}

		if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
			disposition = FILE_CREATE;
		else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
			disposition = FILE_OVERWRITE_IF;
		else if ((oflags & O_CREAT) == O_CREAT)
			disposition = FILE_OPEN_IF;
		else
			cFYI(1, ("Create flag not set in create function"));
	}

	/* BB add processing to set equivalent of mode - e.g. via CreateX with
	   ACLs */

	buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
	if (buf == NULL) {
		kfree(full_path);
		FreeXid(xid);
		return -ENOMEM;
	}

	/*
	 * if we're not using unix extensions, see if we need to set
	 * ATTR_READONLY on the create call
	 */
	if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
		create_options |= CREATE_OPTION_READONLY;

	if (cifs_sb->tcon->ses->capabilities & CAP_NT_SMBS)
		rc = CIFSSMBOpen(xid, tcon, full_path, disposition,
			 desiredAccess, create_options,
			 &fileHandle, &oplock, buf, cifs_sb->local_nls,
			 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	else
		rc = -EIO; /* no NT SMB support fall into legacy open below */

	if (rc == -EIO) {
		/* old server, retry the open legacy style */
		rc = SMBLegacyOpen(xid, tcon, full_path, disposition,
			desiredAccess, create_options,
			&fileHandle, &oplock, buf, cifs_sb->local_nls,
			cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	}
	if (rc) {
		cFYI(1, ("CVE_2010_1148_linux2_6_29_cifs_create returned 0x%x", rc));
		goto CVE_2010_1148_linux2_6_29_cifs_create_out;
	}

	/* If Open reported that we actually created a file
	   then we now have to set the mode if possible */
	if ((tcon->unix_ext) && (oplock & CIFS_CREATE_ACTION)) {
		struct cifs_unix_set_info_args args = {
				.mode	= mode,
				.ctime	= NO_CHANGE_64,
				.atime	= NO_CHANGE_64,
				.mtime	= NO_CHANGE_64,
				.device	= 0,
		};

		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
			args.uid = (__u64) current_fsuid();
			if (inode->i_mode & S_ISGID)
				args.gid = (__u64) inode->i_gid;
			else
				args.gid = (__u64) current_fsgid();
		} else {
			args.uid = NO_CHANGE_64;
			args.gid = NO_CHANGE_64;
		}
		CIFSSMBUnixSetInfo(xid, tcon, full_path, &args,
			cifs_sb->local_nls,
			cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	} else {
		/* BB implement mode setting via Windows security
		   descriptors e.g. */
		/* CIFSSMBWinSetPerms(xid,tcon,path,mode,-1,-1,nls);*/

		/* Could set r/o dos attribute if mode & 0222 == 0 */
	}

CVE_2010_1148_linux2_6_29_cifs_create_get_file_info:
	/* server might mask mode so we have to query for it */
	if (tcon->unix_ext)
		rc = cifs_get_inode_info_unix(&newinode, full_path,
					      inode->i_sb, xid);
	else {
		rc = cifs_get_inode_info(&newinode, full_path, buf,
					 inode->i_sb, xid, &fileHandle);
		if (newinode) {
			if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
				newinode->i_mode = mode;
			if ((oplock & CIFS_CREATE_ACTION) &&
			    (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)) {
				newinode->i_uid = current_fsuid();
				if (inode->i_mode & S_ISGID)
					newinode->i_gid = inode->i_gid;
				else
					newinode->i_gid = current_fsgid();
			}
		}
	}

CVE_2010_1148_linux2_6_29_cifs_create_set_dentry:
	if (rc == 0)
		setup_cifs_dentry(tcon, direntry, newinode);
	else
		cFYI(1, ("Create worked, get_inode_info failed rc = %d", rc));

	/* nfsd case - nfs srv does not set nd */
	if ((nd == NULL) || (!(nd->flags & LOOKUP_OPEN))) {
		/* mknod case - do not leave file open */
		CIFSSMBClose(xid, tcon, fileHandle);
	} else if (newinode) {
		struct cifsFileInfo *pCifsFile =
			kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);

		if (pCifsFile == NULL)
			goto CVE_2010_1148_linux2_6_29_cifs_create_out;
		pCifsFile->netfid = fileHandle;
		pCifsFile->pid = current->tgid;
		pCifsFile->pInode = newinode;
		pCifsFile->invalidHandle = false;
		pCifsFile->closePend     = false;
		init_MUTEX(&pCifsFile->fh_sem);
		mutex_init(&pCifsFile->lock_mutex);
		INIT_LIST_HEAD(&pCifsFile->llist);
		atomic_set(&pCifsFile->wrtPending, 0);

		/* set the following in open now
				pCifsFile->pfile = file; */
		write_lock(&GlobalSMBSeslock);
		list_add(&pCifsFile->tlist, &tcon->openFileList);
		pCifsInode = CIFS_I(newinode);
		if (pCifsInode) {
			/* if readable file instance put first in list*/
			if (write_only) {
				list_add_tail(&pCifsFile->flist,
					      &pCifsInode->openFileList);
			} else {
				list_add(&pCifsFile->flist,
					 &pCifsInode->openFileList);
			}
			if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) {
				pCifsInode->clientCanCacheAll = true;
				pCifsInode->clientCanCacheRead = true;
				cFYI(1, ("Exclusive Oplock inode %p",
					newinode));
			} else if ((oplock & 0xF) == OPLOCK_READ)
				pCifsInode->clientCanCacheRead = true;
		}
		write_unlock(&GlobalSMBSeslock);
	}
CVE_2010_1148_linux2_6_29_cifs_create_out:
	kfree(buf);
	kfree(full_path);
	FreeXid(xid);
	return rc;
}
Exemplo n.º 25
0
int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode,
		dev_t device_number)
{
	int rc = -EPERM;
	int xid;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	char *full_path = NULL;
	struct inode * newinode = NULL;

	if (!old_valid_dev(device_number))
		return -EINVAL;

	xid = GetXid();

	cifs_sb = CIFS_SB(inode->i_sb);
	pTcon = cifs_sb->tcon;

	full_path = build_path_from_dentry(direntry);
	if (full_path == NULL)
		rc = -ENOMEM;
	else if (pTcon->ses->capabilities & CAP_UNIX) {
		mode &= ~current->fs->umask;
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
			rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path,
				mode, (__u64)current->fsuid,
				(__u64)current->fsgid,
				device_number, cifs_sb->local_nls,
				cifs_sb->mnt_cifs_flags &
					CIFS_MOUNT_MAP_SPECIAL_CHR);
		} else {
			rc = CIFSSMBUnixSetPerms(xid, pTcon,
				full_path, mode, (__u64)-1, (__u64)-1,
				device_number, cifs_sb->local_nls,
				cifs_sb->mnt_cifs_flags &
					CIFS_MOUNT_MAP_SPECIAL_CHR);
		}

		if (!rc) {
			rc = cifs_get_inode_info_unix(&newinode, full_path,
						inode->i_sb, xid);
			if (pTcon->nocase)
				direntry->d_op = &cifs_ci_dentry_ops;
			else
				direntry->d_op = &cifs_dentry_ops;
			if (rc == 0)
				d_instantiate(direntry, newinode);
		}
	} else {
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
			int oplock = 0;
			u16 fileHandle;
			FILE_ALL_INFO * buf;

			cFYI(1, ("sfu compat create special file"));

			buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
			if (buf == NULL) {
				kfree(full_path);
				FreeXid(xid);
				return -ENOMEM;
			}

			rc = CIFSSMBOpen(xid, pTcon, full_path,
					 FILE_CREATE, /* fail if exists */
					 GENERIC_WRITE /* BB would
					  WRITE_OWNER | WRITE_DAC be better? */,
					 /* Create a file and set the
					    file attribute to SYSTEM */
					 CREATE_NOT_DIR | CREATE_OPTION_SPECIAL,
					 &fileHandle, &oplock, buf,
					 cifs_sb->local_nls,
					 cifs_sb->mnt_cifs_flags &
					    CIFS_MOUNT_MAP_SPECIAL_CHR);

			/* BB FIXME - add handling for backlevel servers
			   which need legacy open and check for all
			   calls to SMBOpen for fallback to SMBLeagcyOpen */
			if (!rc) {
				/* BB Do not bother to decode buf since no
				   local inode yet to put timestamps in,
				   but we can reuse it safely */
				int bytes_written;
				struct win_dev *pdev;
				pdev = (struct win_dev *)buf;
				if (S_ISCHR(mode)) {
					memcpy(pdev->type, "IntxCHR", 8);
					pdev->major =
					      cpu_to_le64(MAJOR(device_number));
					pdev->minor =
					      cpu_to_le64(MINOR(device_number));
					rc = CIFSSMBWrite(xid, pTcon,
						fileHandle,
						sizeof(struct win_dev),
						0, &bytes_written, (char *)pdev,
						NULL, 0);
				} else if (S_ISBLK(mode)) {
					memcpy(pdev->type, "IntxBLK", 8);
					pdev->major =
					      cpu_to_le64(MAJOR(device_number));
					pdev->minor =
					      cpu_to_le64(MINOR(device_number));
					rc = CIFSSMBWrite(xid, pTcon,
						fileHandle,
						sizeof(struct win_dev),
						0, &bytes_written, (char *)pdev,
						NULL, 0);
				} /* else if(S_ISFIFO */
				CIFSSMBClose(xid, pTcon, fileHandle);
				d_drop(direntry);
			}
			kfree(buf);
			/* add code here to set EAs */
		}
	}

	kfree(full_path);
	FreeXid(xid);
	return rc;
}
Exemplo n.º 26
0
int
cifs_readlink(struct dentry *direntry, char __user *pBuffer, int buflen)
{
	struct inode *inode = direntry->d_inode;
	int rc = -EACCES;
	int xid;
	int oplock = FALSE;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	char *full_path = NULL;
	char *tmp_path = NULL;
	char *tmpbuffer;
	unsigned char *referrals = NULL;
	unsigned int num_referrals = 0;
	int len;
	__u16 fid;

	xid = GetXid();
	cifs_sb = CIFS_SB(inode->i_sb);
	pTcon = cifs_sb->tcon;

/* BB would it be safe against deadlock to grab this sem
      even though rename itself grabs the sem and calls lookup? */
/*       mutex_lock(&inode->i_sb->s_vfs_rename_mutex);*/
	full_path = build_path_from_dentry(direntry);
/*       mutex_unlock(&inode->i_sb->s_vfs_rename_mutex);*/

	if (full_path == NULL) {
		FreeXid(xid);
		return -ENOMEM;
	}

	cFYI(1,
	     ("Full path: %s inode = 0x%p pBuffer = 0x%p buflen = %d",
	      full_path, inode, pBuffer, buflen));
	if (buflen > PATH_MAX)
		len = PATH_MAX;
	else
		len = buflen;
	tmpbuffer = kmalloc(len, GFP_KERNEL);
	if (tmpbuffer == NULL) {
		kfree(full_path);
		FreeXid(xid);
		return -ENOMEM;
	}

/* BB add read reparse point symlink code and
	Unix extensions symlink code here BB */
/* We could disable this based on pTcon->unix_ext flag instead ... but why? */
	if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
		rc = CIFSSMBUnixQuerySymLink(xid, pTcon, full_path,
				tmpbuffer,
				len - 1,
				cifs_sb->local_nls);
	else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
		cERROR(1, ("SFU style symlinks not implemented yet"));
		/* add open and read as in fs/cifs/inode.c */
	} else {
		rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, GENERIC_READ,
				OPEN_REPARSE_POINT, &fid, &oplock, NULL,
				cifs_sb->local_nls,
				cifs_sb->mnt_cifs_flags &
					CIFS_MOUNT_MAP_SPECIAL_CHR);
		if (!rc) {
			rc = CIFSSMBQueryReparseLinkInfo(xid, pTcon, full_path,
				tmpbuffer,
				len - 1,
				fid,
				cifs_sb->local_nls);
			if (CIFSSMBClose(xid, pTcon, fid)) {
				cFYI(1, ("Error closing junction point "
					 "(open for ioctl)"));
			}
			if (rc == -EIO) {
				/* Query if DFS Junction */
				tmp_path =
					kmalloc(MAX_TREE_SIZE + MAX_PATHCONF + 1,
						GFP_KERNEL);
				if (tmp_path) {
					strncpy(tmp_path, pTcon->treeName,
						MAX_TREE_SIZE);
					strncat(tmp_path, full_path,
						MAX_PATHCONF);
					rc = get_dfs_path(xid, pTcon->ses,
						tmp_path,
						cifs_sb->local_nls,
						&num_referrals, &referrals,
						cifs_sb->mnt_cifs_flags &
						    CIFS_MOUNT_MAP_SPECIAL_CHR);
					cFYI(1, ("Get DFS for %s rc = %d ",
						tmp_path, rc));
					if ((num_referrals == 0) && (rc == 0))
						rc = -EACCES;
					else {
						cFYI(1, ("num referral: %d",
							num_referrals));
						if (referrals) {
							cFYI(1,("referral string: %s", referrals));
							strncpy(tmpbuffer,
								referrals,
								len-1);
						}
					}
					kfree(referrals);
					kfree(tmp_path);
}
				/* BB add code like else decode referrals
				then memcpy to tmpbuffer and free referrals
				string array BB */
			}
		}
	}
	/* BB Anything else to do to handle recursive links? */
	/* BB Should we be using page ops here? */

	/* BB null terminate returned string in pBuffer? BB */
	if (rc == 0) {
		rc = vfs_readlink(direntry, pBuffer, len, tmpbuffer);
		cFYI(1,
		     ("vfs_readlink called from cifs_readlink returned %d",
		      rc));
	}

	kfree(tmpbuffer);
	kfree(full_path);
	FreeXid(xid);
	return rc;
}
Exemplo n.º 27
0
int
CIFSCheckMFSymlink(struct cifs_fattr *fattr,
		   const unsigned char *path,
		   struct cifs_sb_info *cifs_sb, int xid)
{
	int rc;
	int oplock = 0;
	__u16 netfid = 0;
	struct tcon_link *tlink;
	struct cifsTconInfo *pTcon;
	u8 *buf;
	char *pbuf;
	unsigned int bytes_read = 0;
	int buf_type = CIFS_NO_BUFFER;
	unsigned int link_len = 0;
	FILE_ALL_INFO file_info;

	if (!CIFSCouldBeMFSymlink(fattr))
		/* it's not a symlink */
		return 0;

	tlink = cifs_sb_tlink(cifs_sb);
	if (IS_ERR(tlink))
		return PTR_ERR(tlink);
	pTcon = tlink_tcon(tlink);

	rc = CIFSSMBOpen(xid, pTcon, path, FILE_OPEN, GENERIC_READ,
			 CREATE_NOT_DIR, &netfid, &oplock, &file_info,
			 cifs_sb->local_nls,
			 cifs_sb->mnt_cifs_flags &
				CIFS_MOUNT_MAP_SPECIAL_CHR);
	if (rc != 0)
		goto out;

	if (file_info.EndOfFile != CIFS_MF_SYMLINK_FILE_SIZE) {
		CIFSSMBClose(xid, pTcon, netfid);
		/* it's not a symlink */
		goto out;
	}

	buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
	if (!buf) {
		rc = -ENOMEM;
		goto out;
	}
	pbuf = buf;

	rc = CIFSSMBRead(xid, pTcon, netfid,
			 CIFS_MF_SYMLINK_FILE_SIZE /* length */,
			 0 /* offset */,
			 &bytes_read, &pbuf, &buf_type);
	CIFSSMBClose(xid, pTcon, netfid);
	if (rc != 0) {
		kfree(buf);
		goto out;
	}

	rc = CIFSParseMFSymlink(buf, bytes_read, &link_len, NULL);
	kfree(buf);
	if (rc == -EINVAL) {
		/* it's not a symlink */
		rc = 0;
		goto out;
	}

	if (rc != 0)
		goto out;

	/* it is a symlink */
	fattr->cf_eof = link_len;
	fattr->cf_mode &= ~S_IFMT;
	fattr->cf_mode |= S_IFLNK | S_IRWXU | S_IRWXG | S_IRWXO;
	fattr->cf_dtype = DT_LNK;
out:
	cifs_put_tlink(tlink);
	return rc;
}
Exemplo n.º 28
0
ssize_t cifs_getxattr(struct dentry *direntry, const char *ea_name,
	void *ea_value, size_t buf_size)
{
	ssize_t rc = -EOPNOTSUPP;
#ifdef CONFIG_CIFS_XATTR
	int xid;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	struct super_block *sb;
	char *full_path;

	if (direntry == NULL)
		return -EIO;
	if (direntry->d_inode == NULL)
		return -EIO;
	sb = direntry->d_inode->i_sb;
	if (sb == NULL)
		return -EIO;

	xid = GetXid();

	cifs_sb = CIFS_SB(sb);
	pTcon = cifs_sb->tcon;

	full_path = build_path_from_dentry(direntry);
	if (full_path == NULL) {
		rc = -ENOMEM;
		FreeXid(xid);
		return rc;
	}
	/* return dos attributes as pseudo xattr */
	/* return alt name if available as pseudo attr */
	if (ea_name == NULL) {
		cFYI(1, "Null xattr names not supported");
	} else if (strncmp(ea_name, CIFS_XATTR_USER_PREFIX, 5) == 0) {
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
			goto get_ea_exit;

		if (strncmp(ea_name, CIFS_XATTR_DOS_ATTRIB, 14) == 0) {
			cFYI(1, "attempt to query cifs inode metadata");
			/* revalidate/getattr then populate from inode */
		} /* BB add else when above is implemented */
		ea_name += 5; /* skip past user. prefix */
		rc = CIFSSMBQAllEAs(xid, pTcon, full_path, ea_name, ea_value,
			buf_size, cifs_sb->local_nls,
			cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	} else if (strncmp(ea_name, CIFS_XATTR_OS2_PREFIX, 4) == 0) {
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
			goto get_ea_exit;

		ea_name += 4; /* skip past os2. prefix */
		rc = CIFSSMBQAllEAs(xid, pTcon, full_path, ea_name, ea_value,
			buf_size, cifs_sb->local_nls,
			cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	} else if (strncmp(ea_name, POSIX_ACL_XATTR_ACCESS,
			  strlen(POSIX_ACL_XATTR_ACCESS)) == 0) {
#ifdef CONFIG_CIFS_POSIX
		if (sb->s_flags & MS_POSIXACL)
			rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
				ea_value, buf_size, ACL_TYPE_ACCESS,
				cifs_sb->local_nls,
				cifs_sb->mnt_cifs_flags &
					CIFS_MOUNT_MAP_SPECIAL_CHR);
#ifdef CONFIG_CIFS_EXPERIMENTAL
		else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
			__u16 fid;
			int oplock = 0;
			struct cifs_ntsd *pacl = NULL;
			__u32 buflen = 0;
			if (experimEnabled)
				rc = CIFSSMBOpen(xid, pTcon, full_path,
					FILE_OPEN, GENERIC_READ, FILE_SHARE_ALL, 0, &fid,
					&oplock, NULL, cifs_sb->local_nls,
					cifs_sb->mnt_cifs_flags &
					CIFS_MOUNT_MAP_SPECIAL_CHR);
			/* else rc is EOPNOTSUPP from above */

			if (rc == 0) {
				rc = CIFSSMBGetCIFSACL(xid, pTcon, fid, &pacl,
						      &buflen);
				CIFSSMBClose(xid, pTcon, fid);
			}
		}
#endif /* EXPERIMENTAL */
#else
		cFYI(1, "query POSIX ACL not supported yet");
#endif /* CONFIG_CIFS_POSIX */
	} else if (strncmp(ea_name, POSIX_ACL_XATTR_DEFAULT,
			  strlen(POSIX_ACL_XATTR_DEFAULT)) == 0) {
#ifdef CONFIG_CIFS_POSIX
		if (sb->s_flags & MS_POSIXACL)
			rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
				ea_value, buf_size, ACL_TYPE_DEFAULT,
				cifs_sb->local_nls,
				cifs_sb->mnt_cifs_flags &
					CIFS_MOUNT_MAP_SPECIAL_CHR);
#else
		cFYI(1, "query POSIX default ACL not supported yet");
#endif
	} else if (strncmp(ea_name,
		  CIFS_XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) == 0) {
		cFYI(1, "Trusted xattr namespace not supported yet");
	} else if (strncmp(ea_name,
		  CIFS_XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) == 0) {
		cFYI(1, "Security xattr namespace not supported yet");
	} else
		cFYI(1,
		    "illegal xattr request %s (only user namespace supported)",
		     ea_name);

	/* We could add an additional check for streams ie
	    if proc/fs/cifs/streamstoxattr is set then
		search server for EAs or streams to
		returns as xattrs */

	if (rc == -EINVAL)
		rc = -EOPNOTSUPP;

get_ea_exit:
	kfree(full_path);
	FreeXid(xid);
#endif
	return rc;
}