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Commit 5d9ac7fd authored by Jeff Layton's avatar Jeff Layton Committed by Steve French
Browse files

cifs: clean up error handling in cifs_mknod 



Get rid of some nesting and add a label we can goto on error.

Signed-off-by: default avatarJeff Layton <jlayton@redhat.com>
Signed-off-by: default avatarSteve French <sfrench@us.ibm.com>
parent da5cabf8

fs/cifs/dir.c

+74 −75
Original line number Diff line number Diff line
@@ -496,6 +496,11 @@ int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode, 
	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;
@@ -506,9 +511,12 @@ int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode, 
	pTcon = cifs_sb->tcon;



	full_path = build_path_from_dentry(direntry);

	if (full_path == NULL)

	if (full_path == NULL) {

		rc = -ENOMEM;

	else if (pTcon->unix_ext) {

		goto mknod_out;

	}



	if (pTcon->unix_ext) {

		struct cifs_unix_set_info_args args = {

			.mode	= mode & ~current_umask(),

			.ctime	= NO_CHANGE_64,
@@ -527,22 +535,24 @@ int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode, 
					    cifs_sb->local_nls,

					    cifs_sb->mnt_cifs_flags &

						CIFS_MOUNT_MAP_SPECIAL_CHR);

		if (rc)

			goto mknod_out;



		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);

		goto mknod_out;

	}

	} else {

		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {

			int oplock = 0;

			u16 fileHandle;

			FILE_ALL_INFO *buf;



	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))

		goto mknod_out;





	cFYI(1, "sfu compat create special file");
@@ -554,27 +564,17 @@ int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode, 
		return rc;

	}



			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);

	/* FIXME: would WRITE_OWNER | WRITE_DAC be better? */

	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 */



			/* 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 */

				unsigned int bytes_written;

				struct win_dev *pdev;

	pdev = (struct win_dev *)buf;

	if (S_ISCHR(mode)) {

		memcpy(pdev->type, "IntxCHR", 8);
@@ -598,16 +598,15 @@ int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode, 
			sizeof(struct win_dev),

			0, &bytes_written, (char *)pdev,

			NULL, 0);

				} /* else if(S_ISFIFO */

	} /* else if (S_ISFIFO) */

	CIFSSMBClose(xid, pTcon, fileHandle);

	d_drop(direntry);

			}

			kfree(buf);

			/* add code here to set EAs */

		}

	}



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



mknod_out:

	kfree(full_path);

	kfree(buf);

	FreeXid(xid);

	return rc;

}