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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [fs/] [ncpfs/] [symlink.c] - Rev 1765
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/* * 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. * * from linux/fs/ext2/symlink.c * * Copyright (C) 1998-99, Frank A. Vorstenbosch * * ncpfs symlink handling code * NLS support (c) 1999 Petr Vandrovec * */ #include <linux/config.h> #ifdef CONFIG_NCPFS_EXTRAS #include <asm/uaccess.h> #include <asm/segment.h> #include <linux/errno.h> #include <linux/fs.h> #include <linux/ncp_fs.h> #include <linux/sched.h> #include <linux/mm.h> #include <linux/stat.h> #include "ncplib_kernel.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 le32_to_cpu(0x6c6d7973) /* "symlnk->" */ #define NCP_SYMLINK_MAGIC1 le32_to_cpu(0x3e2d6b6e) int ncp_create_new(struct inode *dir, struct dentry *dentry, int mode,int attributes); /* ----- 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, cnt; char *link; char *buf = kmap(page); error = -ENOMEM; for (cnt = 0; (link=(char *)kmalloc(NCP_MAX_SYMLINK_SIZE, GFP_NFS))==NULL; cnt++) { if (cnt > 10) goto fail; schedule(); } 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,link,&length); ncp_inode_close(inode); /* Close file handle if no other users... */ ncp_make_closed(inode); if (error) goto failEIO; if (length<NCP_MIN_SYMLINK_SIZE || ((__u32 *)link)[0]!=NCP_SYMLINK_MAGIC0 || ((__u32 *)link)[1]!=NCP_SYMLINK_MAGIC1) goto failEIO; len = NCP_MAX_SYMLINK_SIZE; error = ncp_vol2io(NCP_SERVER(inode), buf, &len, link+8, length-8, 0); kfree(link); if (error) goto fail; SetPageUptodate(page); kunmap(page); UnlockPage(page); return 0; failEIO: error = -EIO; kfree(link); fail: SetPageError(page); kunmap(page); UnlockPage(page); return error; } /* * symlinks can't do much... */ 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 *link; int length, err, i; #ifdef DEBUG PRINTK("ncp_symlink(dir=%p,dentry=%p,symname=%s)\n",dir,dentry,symname); #endif if (!(NCP_SERVER(dir)->m.flags & NCP_MOUNT_SYMLINKS)) return -EPERM; /* EPERM is returned by VFS if symlink procedure does not exist */ if ((length=strlen(symname))>NCP_MAX_SYMLINK_SIZE-8) return -EINVAL; if ((link=(char *)kmalloc(length+9,GFP_NFS))==NULL) return -ENOMEM; err = -EIO; if (ncp_create_new(dir,dentry,0,aSHARED|aHIDDEN)) goto failfree; inode=dentry->d_inode; if (ncp_make_open(inode, O_WRONLY)) goto failfree; ((__u32 *)link)[0]=NCP_SYMLINK_MAGIC0; ((__u32 *)link)[1]=NCP_SYMLINK_MAGIC1; /* map to/from server charset, do not touch upper/lower case as symlink can point out of ncp filesystem */ length += 1; err = ncp_io2vol(NCP_SERVER(inode),link+8,&length,symname,length-1,0); if (err) goto fail; if(ncp_write_kernel(NCP_SERVER(inode), NCP_FINFO(inode)->file_handle, 0, length+8, link, &i) || i!=length+8) { err = -EIO; goto fail; } ncp_inode_close(inode); ncp_make_closed(inode); kfree(link); return 0; fail: ncp_inode_close(inode); ncp_make_closed(inode); failfree: kfree(link); return err; } #endif /* ----- EOF ----- */