cc314eef01
This bug could cause oopses and page state corruption, because ncpfs used the generic page-cache symlink handlign functions. But those functions only work if the page cache is guaranteed to be "stable", ie a page that was installed when the symlink walk was started has to still be installed in the page cache at the end of the walk. We could have fixed ncpfs to not use the generic helper routines, but it is in many ways much cleaner to instead improve on the symlink walking helper routines so that they don't require that absolute stability. We do this by allowing "follow_link()" to return a error-pointer as a cookie, which is fed back to the cleanup "put_link()" routine. This also simplifies NFS symlink handling. Signed-off-by: Linus Torvalds <torvalds@osdl.org>
27 lines
842 B
C
27 lines
842 B
C
/* -*- linux-c -*- --------------------------------------------------------- *
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*
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* linux/fs/autofs/symlink.c
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*
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* Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
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*
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* This file is part of the Linux kernel and is made available under
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* the terms of the GNU General Public License, version 2, or at your
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* option, any later version, incorporated herein by reference.
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*
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* ------------------------------------------------------------------------- */
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#include "autofs_i.h"
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/* Nothing to release.. */
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static void *autofs_follow_link(struct dentry *dentry, struct nameidata *nd)
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{
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char *s=((struct autofs_symlink *)dentry->d_inode->u.generic_ip)->data;
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nd_set_link(nd, s);
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return NULL;
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}
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struct inode_operations autofs_symlink_inode_operations = {
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.readlink = generic_readlink,
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.follow_link = autofs_follow_link
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};
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