diff options
Diffstat (limited to 'fs/ncpfs/symlink.c')
| -rw-r--r-- | fs/ncpfs/symlink.c | 182 |
1 files changed, 0 insertions, 182 deletions
diff --git a/fs/ncpfs/symlink.c b/fs/ncpfs/symlink.c deleted file mode 100644 index b6e16da4837a..000000000000 --- a/fs/ncpfs/symlink.c +++ /dev/null @@ -1,182 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * linux/fs/ncpfs/symlink.c - * - * Code for allowing symbolic links on NCPFS (i.e. NetWare) - * Symbolic links are not supported on native NetWare, so we use an - * infrequently-used flag (Sh) and store a two-word magic header in - * the file to make sure we don't accidentally use a non-link file - * as a link. - * - * When using the NFS namespace, we set the mode to indicate a symlink and - * don't bother with the magic numbers. - * - * from linux/fs/ext2/symlink.c - * - * Copyright (C) 1998-99, Frank A. Vorstenbosch - * - * ncpfs symlink handling code - * NLS support (c) 1999 Petr Vandrovec - * Modified 2000 Ben Harris, University of Cambridge for NFS NS meta-info - * - */ - - -#include <linux/uaccess.h> - -#include <linux/errno.h> -#include <linux/fs.h> -#include <linux/time.h> -#include <linux/slab.h> -#include <linux/mm.h> -#include <linux/stat.h> -#include "ncp_fs.h" - -/* these magic numbers must appear in the symlink file -- this makes it a bit - more resilient against the magic attributes being set on random files. */ - -#define NCP_SYMLINK_MAGIC0 cpu_to_le32(0x6c6d7973) /* "symlnk->" */ -#define NCP_SYMLINK_MAGIC1 cpu_to_le32(0x3e2d6b6e) - -/* ----- read a symbolic link ------------------------------------------ */ - -static int ncp_symlink_readpage(struct file *file, struct page *page) -{ - struct inode *inode = page->mapping->host; - int error, length, len; - char *link, *rawlink; - char *buf = kmap(page); - - error = -ENOMEM; - rawlink = kmalloc(NCP_MAX_SYMLINK_SIZE, GFP_KERNEL); - if (!rawlink) - goto fail; - - if (ncp_make_open(inode,O_RDONLY)) - goto failEIO; - - error=ncp_read_kernel(NCP_SERVER(inode),NCP_FINFO(inode)->file_handle, - 0,NCP_MAX_SYMLINK_SIZE,rawlink,&length); - - ncp_inode_close(inode); - /* Close file handle if no other users... */ - ncp_make_closed(inode); - if (error) - goto failEIO; - - if (NCP_FINFO(inode)->flags & NCPI_KLUDGE_SYMLINK) { - if (length<NCP_MIN_SYMLINK_SIZE || - ((__le32 *)rawlink)[0]!=NCP_SYMLINK_MAGIC0 || - ((__le32 *)rawlink)[1]!=NCP_SYMLINK_MAGIC1) - goto failEIO; - link = rawlink + 8; - length -= 8; - } else { - link = rawlink; - } - - len = NCP_MAX_SYMLINK_SIZE; - error = ncp_vol2io(NCP_SERVER(inode), buf, &len, link, length, 0); - kfree(rawlink); - if (error) - goto fail; - SetPageUptodate(page); - kunmap(page); - unlock_page(page); - return 0; - -failEIO: - error = -EIO; - kfree(rawlink); -fail: - SetPageError(page); - kunmap(page); - unlock_page(page); - return error; -} - -/* - * symlinks can't do much... - */ -const struct address_space_operations ncp_symlink_aops = { - .readpage = ncp_symlink_readpage, -}; - -/* ----- create a new symbolic link -------------------------------------- */ - -int ncp_symlink(struct inode *dir, struct dentry *dentry, const char *symname) { - struct inode *inode; - char *rawlink; - int length, err, i, outlen; - int kludge; - umode_t mode; - __le32 attr; - unsigned int hdr; - - ncp_dbg(1, "dir=%p, dentry=%p, symname=%s\n", dir, dentry, symname); - - if (ncp_is_nfs_extras(NCP_SERVER(dir), NCP_FINFO(dir)->volNumber)) - kludge = 0; - else -#ifdef CONFIG_NCPFS_EXTRAS - if (NCP_SERVER(dir)->m.flags & NCP_MOUNT_SYMLINKS) - kludge = 1; - else -#endif - /* EPERM is returned by VFS if symlink procedure does not exist */ - return -EPERM; - - rawlink = kmalloc(NCP_MAX_SYMLINK_SIZE, GFP_KERNEL); - if (!rawlink) - return -ENOMEM; - - if (kludge) { - mode = 0; - attr = aSHARED | aHIDDEN; - ((__le32 *)rawlink)[0]=NCP_SYMLINK_MAGIC0; - ((__le32 *)rawlink)[1]=NCP_SYMLINK_MAGIC1; - hdr = 8; - } else { - mode = S_IFLNK | S_IRWXUGO; - attr = 0; - hdr = 0; - } - - length = strlen(symname); - /* map to/from server charset, do not touch upper/lower case as - symlink can point out of ncp filesystem */ - outlen = NCP_MAX_SYMLINK_SIZE - hdr; - err = ncp_io2vol(NCP_SERVER(dir), rawlink + hdr, &outlen, symname, length, 0); - if (err) - goto failfree; - - outlen += hdr; - - err = -EIO; - if (ncp_create_new(dir,dentry,mode,0,attr)) { - goto failfree; - } - - inode=d_inode(dentry); - - if (ncp_make_open(inode, O_WRONLY)) - goto failfree; - - if (ncp_write_kernel(NCP_SERVER(inode), NCP_FINFO(inode)->file_handle, - 0, outlen, rawlink, &i) || i!=outlen) { - goto fail; - } - - ncp_inode_close(inode); - ncp_make_closed(inode); - kfree(rawlink); - return 0; -fail:; - ncp_inode_close(inode); - ncp_make_closed(inode); -failfree:; - kfree(rawlink); - return err; -} - -/* ----- EOF ----- */ |