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fix LOOKUP_FOLLOW on automount "symlinks"

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Make sure that automount "symlinks" are followed regardless of LOOKUP_FOLLOW;
it should have no effect on them.

Cc: stable@kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2010-02-16 18:09:36 +00:00 committed by Al Viro
parent f8b55f2510
commit ac278a9c50
1 changed files with 12 additions and 2 deletions
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14
fs/namei.c
View file

@ -822,6 +822,17 @@ static int do_lookup(struct nameidata *nd, struct qstr *name,
return PTR_ERR(dentry);
}
/*
* This is a temporary kludge to deal with "automount" symlinks; proper
* solution is to trigger them on follow_mount(), so that do_lookup()
* would DTRT. To be killed before 2.6.34-final.
*/
static inline int follow_on_final(struct inode *inode, unsigned lookup_flags)
{
return inode && unlikely(inode->i_op->follow_link) &&
((lookup_flags & LOOKUP_FOLLOW) || S_ISDIR(inode->i_mode));
}
/*
* Name resolution.
* This is the basic name resolution function, turning a pathname into
@ -942,8 +953,7 @@ static int link_path_walk(const char *name, struct nameidata *nd)
if (err)
break;
inode = next.dentry->d_inode;
if ((lookup_flags & LOOKUP_FOLLOW)
&& inode && inode->i_op->follow_link) {
if (follow_on_final(inode, lookup_flags)) {
err = do_follow_link(&next, nd);
if (err)
goto return_err;