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proc: less special case in xlate code

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If valid "parent" is passed to proc_create/remove_proc_entry(), then name of
PDE should consist of only one path component, otherwise creation or or
removal will fail.  However, if NULL is passed as parent then create/remove
accept full path as a argument.  This is arbitrary restriction -- all
infrastructure is in place.

So, patch allows the following to succeed:

	create_proc_entry("foo/bar", 0, pde_baz);
	remove_proc_entry("baz/foo/bar", &proc_root);

Also makes the following to behave identically:

	create_proc_entry("foo/bar", 0, NULL);
	create_proc_entry("foo/bar", 0, &proc_root);

Discrepancy noticed by Den Lunev (IIRC).

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexey Dobriyan 2008-04-29 01:01:40 -07:00 committed by Linus Torvalds
parent f649d6d326
commit 7cee4e00e0
1 changed files with 6 additions and 3 deletions
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9
fs/proc/generic.c
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@ -277,8 +277,11 @@ static int xlate_proc_name(const char *name,
int len;
int rtn = 0;
de = *ret;
if (!de)
de = &proc_root;
spin_lock(&proc_subdir_lock);
de = &proc_root;
while (1) {
next = strchr(cp, '/');
if (!next)
@ -582,7 +585,7 @@ static struct proc_dir_entry *__proc_create(struct proc_dir_entry **parent,
/* make sure name is valid */
if (!name || !strlen(name)) goto out;
if (!(*parent) && xlate_proc_name(name, parent, &fn) != 0)
if (xlate_proc_name(name, parent, &fn) != 0)
goto out;
/* At this point there must not be any '/' characters beyond *fn */
@ -738,7 +741,7 @@ void remove_proc_entry(const char *name, struct proc_dir_entry *parent)
const char *fn = name;
int len;
if (!parent && xlate_proc_name(name, &parent, &fn) != 0)
if (xlate_proc_name(name, &parent, &fn) != 0)
return;
len = strlen(fn);