C++ CIFS_SB函数代码示例

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)) {
//.........这里部分代码省略.........

static void cifs_kill_sb(struct super_block *sb)
{
	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
	kill_anon_super(sb);
	cifs_umount(cifs_sb);
}

static int
cifs_read_super(struct super_block *sb, void *data,
		const char *devname, int silent)
{
	struct inode *inode;
	struct cifs_sb_info *cifs_sb;
	int rc = 0;

	sb->s_flags |= MS_NODIRATIME; /* and probably even noatime */
	sb->s_fs_info = kmalloc(sizeof(struct cifs_sb_info),GFP_KERNEL);
	cifs_sb = CIFS_SB(sb);
	if(cifs_sb == NULL)
		return -ENOMEM;
	else
		memset(cifs_sb,0,sizeof(struct cifs_sb_info));
	

	rc = cifs_mount(sb, cifs_sb, data, devname);

	if (rc) {
		if (!silent)
			cERROR(1,
			       ("cifs_mount failed w/return code = %d", rc));
		goto out_mount_failed;
	}

	sb->s_magic = CIFS_MAGIC_NUMBER;
	sb->s_op = &cifs_super_ops;
/*	if(cifs_sb->tcon->ses->server->maxBuf > MAX_CIFS_HDR_SIZE + 512)
	    sb->s_blocksize = cifs_sb->tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE; */
#ifdef CONFIG_CIFS_QUOTA
	sb->s_qcop = &cifs_quotactl_ops;
#endif
	sb->s_blocksize = CIFS_MAX_MSGSIZE;
	sb->s_blocksize_bits = 14;	/* default 2**14 = CIFS_MAX_MSGSIZE */
	inode = iget(sb, ROOT_I);

	if (!inode) {
		rc = -ENOMEM;
		goto out_no_root;
	}

	sb->s_root = d_alloc_root(inode);

	if (!sb->s_root) {
		rc = -ENOMEM;
		goto out_no_root;
	}

	return 0;

out_no_root:
	cERROR(1, ("cifs_read_super: get root inode failed"));
	if (inode)
		iput(inode);

out_mount_failed:
	if(cifs_sb) {
		if(cifs_sb->local_nls)
			unload_nls(cifs_sb->local_nls);	
		kfree(cifs_sb);
	}
	return rc;
}

static int initiate_cifs_search(const int xid, struct file *file)
{
	int rc = 0;
	char *full_path = NULL;
	struct cifsFileInfo *cifsFile;
	struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
	struct tcon_link *tlink = NULL;
	struct cifs_tcon *pTcon;

	if (file->private_data == NULL) {
		tlink = cifs_sb_tlink(cifs_sb);
		if (IS_ERR(tlink))
			return PTR_ERR(tlink);

		cifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
		if (cifsFile == NULL) {
			rc = -ENOMEM;
			goto error_exit;
		}
		file->private_data = cifsFile;
		cifsFile->tlink = cifs_get_tlink(tlink);
		pTcon = tlink_tcon(tlink);
	} else {
		cifsFile = file->private_data;
		pTcon = tlink_tcon(cifsFile->tlink);
	}

	cifsFile->invalidHandle = true;
	cifsFile->srch_inf.endOfSearch = false;

	full_path = build_path_from_dentry(file->f_path.dentry);
	if (full_path == NULL) {
		rc = -ENOMEM;
		goto error_exit;
	}

	cFYI(1, "Full path: %s start at: %lld", full_path, file->f_pos);

ffirst_retry:
	/* test for Unix extensions */
	/* but now check for them on the share/mount not on the SMB session */
/*	if (pTcon->ses->capabilities & CAP_UNIX) { */
	if (pTcon->unix_ext)
		cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
	else if ((pTcon->ses->capabilities &
			(CAP_NT_SMBS | CAP_NT_FIND)) == 0) {
		cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
	} else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
		cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
	} else /* not srvinos - BB fixme add check for backlevel? */ {
		cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
	}

	rc = CIFSFindFirst(xid, pTcon, full_path, cifs_sb->local_nls,
		&cifsFile->netfid, &cifsFile->srch_inf,
		cifs_sb->mnt_cifs_flags &
			CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
	if (rc == 0)
		cifsFile->invalidHandle = false;
	/* BB add following call to handle readdir on new NTFS symlink errors
	else if STATUS_STOPPED_ON_SYMLINK
		call get_symlink_reparse_path and retry with new path */
	else if ((rc == -EOPNOTSUPP) &&
		(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
		cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
		goto ffirst_retry;
	}
error_exit:
	kfree(full_path);
	cifs_put_tlink(tlink);
	return rc;
}

static int
cifs_read_super(struct super_block *sb, void *data,
		const char *devname, int silent)
{
	struct inode *inode;
	struct cifs_sb_info *cifs_sb;
	int rc = 0;

	/* BB should we make this contingent on mount parm? */
	sb->s_flags |= MS_NODIRATIME | MS_NOATIME;
	sb->s_fs_info = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
	cifs_sb = CIFS_SB(sb);
	if (cifs_sb == NULL)
		return -ENOMEM;

#ifdef CONFIG_CIFS_DFS_UPCALL
	/* copy mount params to sb for use in submounts */
	/* BB: should we move this after the mount so we
	 * do not have to do the copy on failed mounts?
	 * BB: May be it is better to do simple copy before
	 * complex operation (mount), and in case of fail
	 * just exit instead of doing mount and attempting
	 * undo it if this copy fails?*/
	if (data) {
		int len = strlen(data);
		cifs_sb->mountdata = kzalloc(len + 1, GFP_KERNEL);
		if (cifs_sb->mountdata == NULL) {
			kfree(sb->s_fs_info);
			sb->s_fs_info = NULL;
			return -ENOMEM;
		}
		strncpy(cifs_sb->mountdata, data, len + 1);
		cifs_sb->mountdata[len] = '\0';
	}
#endif

	rc = cifs_mount(sb, cifs_sb, data, devname);

	if (rc) {
		if (!silent)
			cERROR(1,
			       ("cifs_mount failed w/return code = %d", rc));
		goto out_mount_failed;
	}

	sb->s_magic = CIFS_MAGIC_NUMBER;
	sb->s_op = &cifs_super_ops;
/*	if (cifs_sb->tcon->ses->server->maxBuf > MAX_CIFS_HDR_SIZE + 512)
	    sb->s_blocksize =
		cifs_sb->tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE; */
#ifdef CONFIG_CIFS_QUOTA
	sb->s_qcop = &cifs_quotactl_ops;
#endif
	sb->s_blocksize = CIFS_MAX_MSGSIZE;
	sb->s_blocksize_bits = 14;	/* default 2**14 = CIFS_MAX_MSGSIZE */
	inode = cifs_root_iget(sb, ROOT_I);

	if (IS_ERR(inode)) {
		rc = PTR_ERR(inode);
		inode = NULL;
		goto out_no_root;
	}

	sb->s_root = d_alloc_root(inode);

	if (!sb->s_root) {
		rc = -ENOMEM;
		goto out_no_root;
	}

#ifdef CONFIG_CIFS_EXPERIMENTAL
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
		cFYI(1, ("export ops supported"));
		sb->s_export_op = &cifs_export_ops;
	}
#endif /* EXPERIMENTAL */

	return 0;

out_no_root:
	cERROR(1, ("cifs_read_super: get root inode failed"));
	if (inode)
		iput(inode);

	cifs_umount(sb, cifs_sb);

out_mount_failed:
	if (cifs_sb) {
#ifdef CONFIG_CIFS_DFS_UPCALL
		if (cifs_sb->mountdata) {
			kfree(cifs_sb->mountdata);
			cifs_sb->mountdata = NULL;
		}
#endif
		if (cifs_sb->local_nls)
			unload_nls(cifs_sb->local_nls);
		kfree(cifs_sb);
	}
	return rc;
}

static int cifs_xattr_get(const struct xattr_handler *handler,
			  struct dentry *dentry, struct inode *inode,
			  const char *name, void *value, size_t size)
{
	ssize_t rc = -EOPNOTSUPP;
	unsigned int xid;
	struct super_block *sb = dentry->d_sb;
	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
	struct tcon_link *tlink;
	struct cifs_tcon *pTcon;
	char *full_path;

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

	/* return alt name if available as pseudo attr */
	switch (handler->flags) {
	case XATTR_USER:
		cifs_dbg(FYI, "%s:querying user xattr %s\n", __func__, name);
		if (strcmp(name, CIFS_XATTR_ATTRIB) == 0) {
			rc = cifs_attrib_get(dentry, inode, value, size);
			break;
		} else if (strcmp(name, CIFS_XATTR_CREATETIME) == 0) {
			rc = cifs_creation_time_get(dentry, inode, value, size);
			break;
		}

		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
			goto out;

		if (pTcon->ses->server->ops->query_all_EAs)
			rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
				full_path, name, value, size, cifs_sb);
		break;

	case XATTR_CIFS_ACL: {
#ifdef CONFIG_CIFS_ACL
		u32 acllen;
		struct cifs_ntsd *pacl;

		if (pTcon->ses->server->ops->get_acl == NULL)
			goto out; /* rc already EOPNOTSUPP */

		pacl = pTcon->ses->server->ops->get_acl(cifs_sb,
				inode, full_path, &acllen);
		if (IS_ERR(pacl)) {
			rc = PTR_ERR(pacl);
			cifs_dbg(VFS, "%s: error %zd getting sec desc\n",
				 __func__, rc);
		} else {
			if (value) {
				if (acllen > size)
					acllen = -ERANGE;
				else
					memcpy(value, pacl, acllen);
			}
			rc = acllen;
			kfree(pacl);
		}
#endif  /* CONFIG_CIFS_ACL */
		break;
	}

	case XATTR_ACL_ACCESS:
#ifdef CONFIG_CIFS_POSIX
		if (sb->s_flags & SB_POSIXACL)
			rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
				value, size, ACL_TYPE_ACCESS,
				cifs_sb->local_nls,
				cifs_remap(cifs_sb));
#endif  /* CONFIG_CIFS_POSIX */
		break;

	case XATTR_ACL_DEFAULT:
#ifdef CONFIG_CIFS_POSIX
		if (sb->s_flags & SB_POSIXACL)
			rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
				value, size, ACL_TYPE_DEFAULT,
				cifs_sb->local_nls,
				cifs_remap(cifs_sb));
#endif  /* CONFIG_CIFS_POSIX */
		break;
	}

	/* 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)
//.........这里部分代码省略.........

int
cifs_symlink(struct inode *inode, struct dentry *direntry, const char *symname)
{
	int rc = -EOPNOTSUPP;
	int xid;
	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
	struct tcon_link *tlink;
	struct cifs_tcon *pTcon;
	char *full_path = NULL;
	struct inode *newinode = NULL;

	xid = GetXid();

	tlink = cifs_sb_tlink(cifs_sb);
	if (IS_ERR(tlink)) {
		rc = PTR_ERR(tlink);
		goto symlink_exit;
	}
	pTcon = tlink_tcon(tlink);

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

	cFYI(1, "Full path: %s", full_path);
	cFYI(1, "symname is %s", symname);

	/* BB what if DFS and this volume is on different share? BB */
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
		rc = CIFSCreateMFSymLink(xid, pTcon, full_path, symname,
					 cifs_sb->local_nls,
					 cifs_sb->mnt_cifs_flags &
						CIFS_MOUNT_MAP_SPECIAL_CHR);
	else if (pTcon->unix_ext)
		rc = CIFSUnixCreateSymLink(xid, pTcon, full_path, symname,
					   cifs_sb->local_nls);
	/* else
	   rc = CIFSCreateReparseSymLink(xid, pTcon, fromName, toName,
					cifs_sb_target->local_nls); */

	if (rc == 0) {
		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, NULL,
						 inode->i_sb, xid, NULL);

		if (rc != 0) {
			cFYI(1, "Create symlink ok, getinodeinfo fail rc = %d",
			      rc);
		} else {
			d_instantiate(direntry, newinode);
		}
	}
symlink_exit:
	kfree(full_path);
	cifs_put_tlink(tlink);
	FreeXid(xid);
	return rc;
}

/*
 * cifs_show_options() is for displaying mount options in /proc/mounts.
 * Not all settable options are displayed but most of the important
 * ones are.
 */
static int
cifs_show_options(struct seq_file *s, struct vfsmount *m)
{
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *tcon;

	cifs_sb = CIFS_SB(m->mnt_sb);
	tcon = cifs_sb->tcon;

	seq_printf(s, ",unc=%s", cifs_sb->tcon->treeName);
	if (tcon->ses->userName)
		seq_printf(s, ",username=%s", tcon->ses->userName);
	if (tcon->ses->domainName)
		seq_printf(s, ",domain=%s", tcon->ses->domainName);

	seq_printf(s, ",uid=%d", cifs_sb->mnt_uid);
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
		seq_printf(s, ",forceuid");

	seq_printf(s, ",gid=%d", cifs_sb->mnt_gid);
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
		seq_printf(s, ",forcegid");

	cifs_show_address(s, tcon->ses->server);

	if (!tcon->unix_ext)
		seq_printf(s, ",file_mode=0%o,dir_mode=0%o",
					   cifs_sb->mnt_file_mode,
					   cifs_sb->mnt_dir_mode);
	if (tcon->seal)
		seq_printf(s, ",seal");
	if (tcon->nocase)
		seq_printf(s, ",nocase");
	if (tcon->retry)
		seq_printf(s, ",hard");
	if (cifs_sb->prepath)
		seq_printf(s, ",prepath=%s", cifs_sb->prepath);
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
		seq_printf(s, ",posixpaths");
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
		seq_printf(s, ",setuids");
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
		seq_printf(s, ",serverino");
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
		seq_printf(s, ",directio");
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
		seq_printf(s, ",nouser_xattr");
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
		seq_printf(s, ",mapchars");
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
		seq_printf(s, ",sfu");
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
		seq_printf(s, ",nobrl");
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
		seq_printf(s, ",cifsacl");
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
		seq_printf(s, ",dynperm");
	if (m->mnt_sb->s_flags & MS_POSIXACL)
		seq_printf(s, ",acl");

	seq_printf(s, ",rsize=%d", cifs_sb->rsize);
	seq_printf(s, ",wsize=%d", cifs_sb->wsize);

	return 0;
}

void *
cifs_follow_link(struct dentry *direntry, struct nameidata *nd)
{
	struct inode *inode = direntry->d_inode;
	int rc = -ENOMEM;
	int xid;
	char *full_path = NULL;
	char *target_path = NULL;
	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
	struct tcon_link *tlink = NULL;
	struct cifs_tcon *tcon;

	xid = GetXid();

	tlink = cifs_sb_tlink(cifs_sb);
	if (IS_ERR(tlink)) {
		rc = PTR_ERR(tlink);
		tlink = NULL;
		goto out;
	}
	tcon = tlink_tcon(tlink);

	/*
	 * For now, we just handle symlinks with unix extensions enabled.
	 * Eventually we should handle NTFS reparse points, and MacOS
	 * symlink support. For instance...
	 *
	 * rc = CIFSSMBQueryReparseLinkInfo(...)
	 *
	 * For now, just return -EACCES when the server doesn't support posix
	 * extensions. Note that we still allow querying symlinks when posix
	 * extensions are manually disabled. We could disable these as well
	 * but there doesn't seem to be any harm in allowing the client to
	 * read them.
	 */
	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
	    && !(tcon->ses->capabilities & CAP_UNIX)) {
		rc = -EACCES;
		goto out;
	}

	full_path = build_path_from_dentry(direntry);
	if (!full_path)
		goto out;

	cFYI(1, "Full path: %s inode = 0x%p", full_path, inode);

	rc = -EACCES;
	/*
	 * First try Minshall+French Symlinks, if configured
	 * and fallback to UNIX Extensions Symlinks.
	 */
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
		rc = CIFSQueryMFSymLink(xid, tcon, full_path, &target_path,
					cifs_sb->local_nls,
					cifs_sb->mnt_cifs_flags &
						CIFS_MOUNT_MAP_SPECIAL_CHR);

	if ((rc != 0) && (tcon->ses->capabilities & CAP_UNIX))
		rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, &target_path,
					     cifs_sb->local_nls);

	kfree(full_path);
out:
	if (rc != 0) {
		kfree(target_path);
		target_path = ERR_PTR(rc);
	}

	FreeXid(xid);
	if (tlink)
		cifs_put_tlink(tlink);
	nd_set_link(nd, target_path);
	return NULL;
}

int
cifs_hardlink(struct dentry *old_file, struct inode *inode,
	      struct dentry *direntry)
{
	int rc = -EACCES;
	int xid;
	char *fromName = NULL;
	char *toName = NULL;
	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
	struct tcon_link *tlink;
	struct cifs_tcon *pTcon;
	struct cifsInodeInfo *cifsInode;

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

	xid = GetXid();

	fromName = build_path_from_dentry(old_file);
	toName = build_path_from_dentry(direntry);
	if ((fromName == NULL) || (toName == NULL)) {
		rc = -ENOMEM;
		goto cifs_hl_exit;
	}

	if (pTcon->unix_ext)
		rc = CIFSUnixCreateHardLink(xid, pTcon, fromName, toName,
					    cifs_sb->local_nls,
					    cifs_sb->mnt_cifs_flags &
						CIFS_MOUNT_MAP_SPECIAL_CHR);
	else {
		rc = CIFSCreateHardLink(xid, pTcon, fromName, toName,
					cifs_sb->local_nls,
					cifs_sb->mnt_cifs_flags &
						CIFS_MOUNT_MAP_SPECIAL_CHR);
		if ((rc == -EIO) || (rc == -EINVAL))
			rc = -EOPNOTSUPP;
	}

	d_drop(direntry);	/* force new lookup from server of target */

	/* if source file is cached (oplocked) revalidate will not go to server
	   until the file is closed or oplock broken so update nlinks locally */
	if (old_file->d_inode) {
		cifsInode = CIFS_I(old_file->d_inode);
		if (rc == 0) {
			old_file->d_inode->i_nlink++;
/* BB should we make this contingent on superblock flag NOATIME? */
/*			old_file->d_inode->i_ctime = CURRENT_TIME;*/
			/* parent dir timestamps will update from srv
			within a second, would it really be worth it
			to set the parent dir cifs inode time to zero
			to force revalidate (faster) for it too? */
		}
		/* if not oplocked will force revalidate to get info
		   on source file from srv */
		cifsInode->time = 0;

		/* Will update parent dir timestamps from srv within a second.
		   Would it really be worth it to set the parent dir (cifs
		   inode) time field to zero to force revalidate on parent
		   directory faster ie
			CIFS_I(inode)->time = 0;  */
	}

cifs_hl_exit:
	kfree(fromName);
	kfree(toName);
	FreeXid(xid);
	cifs_put_tlink(tlink);
	return rc;
}

struct dentry *
cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
	    struct nameidata *nd)
{
	int xid;
	int rc = 0; /* to get around spurious gcc warning, set to zero here */
	__u32 oplock = 0;
	__u16 fileHandle = 0;
	bool posix_open = false;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	struct cifsFileInfo *cfile;
	struct inode *newInode = NULL;
	char *full_path = NULL;
	struct file *filp;

	xid = GetXid();

	cFYI(1, "parent inode = 0x%p name is: %s and dentry = 0x%p",
	      parent_dir_inode, direntry->d_name.name, direntry);

	/* check whether path exists */

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

	/*
	 * Don't allow the separator character in a path component.
	 * The VFS will not allow "/", but "\" is allowed by posix.
	 */
	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
		int i;
		for (i = 0; i < direntry->d_name.len; i++)
			if (direntry->d_name.name[i] == '\\') {
				cFYI(1, "Invalid file name");
				FreeXid(xid);
				return ERR_PTR(-EINVAL);
			}
	}

	/*
	 * O_EXCL: optimize away the lookup, but don't hash the dentry. Let
	 * the VFS handle the create.
	 */
	if (nd && (nd->flags & LOOKUP_EXCL)) {
		d_instantiate(direntry, NULL);
		return NULL;
	}

	/* can not grab the rename sem here since it would
	deadlock in the cases (beginning of sys_rename itself)
	in which we already have the sb rename sem */
	full_path = build_path_from_dentry(direntry);
	if (full_path == NULL) {
		FreeXid(xid);
		return ERR_PTR(-ENOMEM);
	}

	if (direntry->d_inode != NULL) {
		cFYI(1, "non-NULL inode in lookup");
	} else {
		cFYI(1, "NULL inode in lookup");
	}
	cFYI(1, "Full path: %s inode = 0x%p", full_path, direntry->d_inode);

	/* Posix open is only called (at lookup time) for file create now.
	 * For opens (rather than creates), because we do not know if it
	 * is a file or directory yet, and current Samba no longer allows
	 * us to do posix open on dirs, we could end up wasting an open call
	 * on what turns out to be a dir. For file opens, we wait to call posix
	 * open till cifs_open.  It could be added here (lookup) in the future
	 * but the performance tradeoff of the extra network request when EISDIR
	 * or EACCES is returned would have to be weighed against the 50%
	 * reduction in network traffic in the other paths.
	 */
	if (pTcon->unix_ext) {
		if (nd && !(nd->flags & (LOOKUP_PARENT | LOOKUP_DIRECTORY)) &&
		     (nd->flags & LOOKUP_OPEN) && !pTcon->broken_posix_open &&
		     (nd->intent.open.flags & O_CREAT)) {
			rc = cifs_posix_open(full_path, &newInode,
					parent_dir_inode->i_sb,
					nd->intent.open.create_mode,
					nd->intent.open.flags, &oplock,
					&fileHandle, xid);
			/*
			 * The check below works around a bug in POSIX
			 * open in samba versions 3.3.1 and earlier where
			 * open could incorrectly fail with invalid parameter.
			 * If either that or op not supported returned, follow
			 * the normal lookup.
			 */
			if ((rc == 0) || (rc == -ENOENT))
				posix_open = true;
			else if ((rc == -EINVAL) || (rc != -EOPNOTSUPP))
				pTcon->broken_posix_open = true;
		}
		if (!posix_open)
			rc = cifs_get_inode_info_unix(&newInode, full_path,
						parent_dir_inode->i_sb, xid);
	} else
//.........这里部分代码省略.........

int cifs_setxattr(struct dentry * direntry, const char * ea_name,
        const void * ea_value, size_t value_size, int flags)
{
	int 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;

	down(&sb->s_vfs_rename_sem);
	full_path = build_path_from_dentry(direntry);
	up(&sb->s_vfs_rename_sem);
	if(full_path == NULL) {
		FreeXid(xid);
		return -ENOMEM;
	}
	/* return dos attributes as pseudo xattr */
	/* return alt name if available as pseudo attr */

	/* if proc/fs/cifs/streamstoxattr is set then
		search server for EAs or streams to 
		returns as xattrs */
	if(value_size > MAX_EA_VALUE_SIZE) {
		cFYI(1,("size of EA value too large"));
		kfree(full_path);
		FreeXid(xid);
		return -EOPNOTSUPP;
	}

	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 set_ea_exit;
		if(strncmp(ea_name,CIFS_XATTR_DOS_ATTRIB,14) == 0) {
			cFYI(1,("attempt to set cifs inode metadata"));
		}
		ea_name += 5; /* skip past user. prefix */
		rc = CIFSSMBSetEA(xid,pTcon,full_path,ea_name,ea_value,
			(__u16)value_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 set_ea_exit;

		ea_name += 4; /* skip past os2. prefix */
		rc = CIFSSMBSetEA(xid,pTcon,full_path,ea_name,ea_value,
			(__u16)value_size, cifs_sb->local_nls,
			cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	} else {
		int temp; 
		temp = strncmp(ea_name,POSIX_ACL_XATTR_ACCESS,
			strlen(POSIX_ACL_XATTR_ACCESS));
		if (temp == 0) {
#ifdef CONFIG_CIFS_POSIX
			if(sb->s_flags & MS_POSIXACL)
				rc = CIFSSMBSetPosixACL(xid, pTcon,full_path,
					ea_value, (const int)value_size, 
					ACL_TYPE_ACCESS,cifs_sb->local_nls,
					cifs_sb->mnt_cifs_flags & 
						CIFS_MOUNT_MAP_SPECIAL_CHR);
			cFYI(1,("set POSIX ACL rc %d",rc));
#else
			cFYI(1,("set POSIX ACL not supported"));
#endif
		} 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 = CIFSSMBSetPosixACL(xid, pTcon,full_path,
					ea_value, (const int)value_size, 
					ACL_TYPE_DEFAULT, cifs_sb->local_nls,
					cifs_sb->mnt_cifs_flags & 
						CIFS_MOUNT_MAP_SPECIAL_CHR);
			cFYI(1,("set POSIX default ACL rc %d",rc));
#else
			cFYI(1,("set default POSIX ACL not supported"));
#endif
		} else {
			cFYI(1,("illegal xattr request %s (only user namespace supported)",ea_name));
		  /* BB what if no namespace prefix? */
		  /* Should we just pass them to server, except for 
		  system and perhaps security prefixes? */
		}
	}

set_ea_exit:
//.........这里部分代码省略.........

static int cifs_xattr_set(const struct xattr_handler *handler,
			  struct dentry *dentry, struct inode *inode,
			  const char *name, const void *value,
			  size_t size, int flags)
{
	int rc = -EOPNOTSUPP;
	unsigned int xid;
	struct super_block *sb = dentry->d_sb;
	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
	struct tcon_link *tlink;
	struct cifs_tcon *pTcon;
	char *full_path;

	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(dentry);
	if (full_path == NULL) {
		rc = -ENOMEM;
		goto out;
	}
	/* return dos attributes as pseudo xattr */
	/* return alt name if available as pseudo attr */

	/* if proc/fs/cifs/streamstoxattr is set then
		search server for EAs or streams to
		returns as xattrs */
	if (size > MAX_EA_VALUE_SIZE) {
		cifs_dbg(FYI, "size of EA value too large\n");
		rc = -EOPNOTSUPP;
		goto out;
	}

	switch (handler->flags) {
	case XATTR_USER:
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
			goto out;

		if (pTcon->ses->server->ops->set_EA)
			rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
				full_path, name, value, (__u16)size,
				cifs_sb->local_nls, cifs_sb);
		break;

	case XATTR_CIFS_ACL: {
#ifdef CONFIG_CIFS_ACL
		struct cifs_ntsd *pacl;

		if (!value)
			goto out;
		pacl = kmalloc(size, GFP_KERNEL);
		if (!pacl) {
			rc = -ENOMEM;
		} else {
			memcpy(pacl, value, size);
			if (value &&
			    pTcon->ses->server->ops->set_acl)
				rc = pTcon->ses->server->ops->set_acl(pacl,
						size, inode,
						full_path, CIFS_ACL_DACL);
			else
				rc = -EOPNOTSUPP;
			if (rc == 0) /* force revalidate of the inode */
				CIFS_I(inode)->time = 0;
			kfree(pacl);
		}
#endif /* CONFIG_CIFS_ACL */
		break;
	}

	case XATTR_ACL_ACCESS:
#ifdef CONFIG_CIFS_POSIX
		if (!value)
			goto out;
		if (sb->s_flags & SB_POSIXACL)
			rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
				value, (const int)size,
				ACL_TYPE_ACCESS, cifs_sb->local_nls,
				cifs_remap(cifs_sb));
#endif  /* CONFIG_CIFS_POSIX */
		break;

	case XATTR_ACL_DEFAULT:
#ifdef CONFIG_CIFS_POSIX
		if (!value)
			goto out;
		if (sb->s_flags & SB_POSIXACL)
			rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
				value, (const int)size,
				ACL_TYPE_DEFAULT, cifs_sb->local_nls,
				cifs_remap(cifs_sb));
#endif  /* CONFIG_CIFS_POSIX */
		break;
	}

out:
//.........这里部分代码省略.........

static int cifs_filldir(char *pfindEntry, struct file *file, filldir_t filldir,
			void *direntry, char *scratch_buf, unsigned int max_len)
{
	int rc = 0;
	struct qstr qstring;
	struct cifsFileInfo *pCifsF;
	u64    inum;
	ino_t  ino;
	struct super_block *sb;
	struct cifs_sb_info *cifs_sb;
	struct dentry *tmp_dentry;
	struct cifs_fattr fattr;

	/* get filename and len into qstring */
	/* get dentry */
	/* decide whether to create and populate ionde */
	if ((direntry == NULL) || (file == NULL))
		return -EINVAL;

	pCifsF = file->private_data;

	if ((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
		return -ENOENT;

	rc = cifs_entry_is_dot(pfindEntry, pCifsF);
	/* skip . and .. since we added them first */
	if (rc != 0)
		return 0;

	sb = file->f_path.dentry->d_sb;
	cifs_sb = CIFS_SB(sb);

	qstring.name = scratch_buf;
	rc = cifs_get_name_from_search_buf(&qstring, pfindEntry,
			pCifsF->srch_inf.info_level,
			pCifsF->srch_inf.unicode, cifs_sb,
			max_len, &inum /* returned */);

	if (rc)
		return rc;

	if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX)
		cifs_unix_basic_to_fattr(&fattr,
				 &((FILE_UNIX_INFO *) pfindEntry)->basic,
				 cifs_sb);
	else if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD)
		cifs_std_info_to_fattr(&fattr, (FIND_FILE_STANDARD_INFO *)
					pfindEntry, cifs_sb);
	else
		cifs_dir_info_to_fattr(&fattr, (FILE_DIRECTORY_INFO *)
					pfindEntry, cifs_sb);

	if (inum && (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
		fattr.cf_uniqueid = inum;
	} else {
		fattr.cf_uniqueid = iunique(sb, ROOT_I);
		cifs_autodisable_serverino(cifs_sb);
	}

	if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) &&
	    CIFSCouldBeMFSymlink(&fattr))
		/*
		 * trying to get the type and mode can be slow,
		 * so just call those regular files for now, and mark
		 * for reval
		 */
		fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;

	ino = cifs_uniqueid_to_ino_t(fattr.cf_uniqueid);
	tmp_dentry = cifs_readdir_lookup(file->f_dentry, &qstring, &fattr);

	rc = filldir(direntry, qstring.name, qstring.len, file->f_pos,
		     ino, fattr.cf_dtype);

	dput(tmp_dentry);
	return rc;
}

int cifs_ioctl (struct inode * inode, struct file * filep,
                unsigned int command, unsigned long arg)
{
    int rc = -ENOTTY; /* strange error - but the precedent */
    int xid;
    struct cifs_sb_info *cifs_sb;
#ifdef CONFIG_CIFS_POSIX
    __u64	ExtAttrBits = 0;
    __u64	ExtAttrMask = 0;
    __u64   caps;
    struct cifsTconInfo *tcon;
    struct cifsFileInfo *pSMBFile =
        (struct cifsFileInfo *)filep->private_data;
#endif /* CONFIG_CIFS_POSIX */

    xid = GetXid();

    cFYI(1,("ioctl file %p  cmd %u  arg %lu",filep,command,arg));

    cifs_sb = CIFS_SB(inode->i_sb);

#ifdef CONFIG_CIFS_POSIX
    tcon = cifs_sb->tcon;
    if(tcon)
        caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
    else {
        rc = -EIO;
        FreeXid(xid);
        return -EIO;
    }
#endif /* CONFIG_CIFS_POSIX */

    switch(command) {
    case CIFS_IOC_CHECKUMOUNT:
        cFYI(1,("User unmount attempted"));
        if(cifs_sb->mnt_uid == current->uid)
            rc = 0;
        else {
            rc = -EACCES;
            cFYI(1,("uids do not match"));
        }
        break;
#ifdef CONFIG_CIFS_POSIX
    case FS_IOC_GETFLAGS:
        if(CIFS_UNIX_EXTATTR_CAP & caps) {
            if (pSMBFile == NULL)
                break;
            rc = CIFSGetExtAttr(xid, tcon, pSMBFile->netfid,
                                &ExtAttrBits, &ExtAttrMask);
            if(rc == 0)
                rc = put_user(ExtAttrBits &
                              FS_FL_USER_VISIBLE,
                              (int __user *)arg);
        }
        break;

    case FS_IOC_SETFLAGS:
        if(CIFS_UNIX_EXTATTR_CAP & caps) {
            if(get_user(ExtAttrBits,(int __user *)arg)) {
                rc = -EFAULT;
                break;
            }
            if (pSMBFile == NULL)
                break;
            /* rc= CIFSGetExtAttr(xid,tcon,pSMBFile->netfid,
            	extAttrBits, &ExtAttrMask);*/

        }
        cFYI(1,("set flags not implemented yet"));
        break;
#endif /* CONFIG_CIFS_POSIX */
    default:
        cFYI(1,("unsupported ioctl"));
        break;
    }

    FreeXid(xid);
    return rc;
}