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From: Miklos Szeredi on 10 Aug 2010 05:50
From: Miklos Szeredi <mszeredi(a)suse.cz>

__d_path() has 4 callers:

d_path()
sys_getcwd()
seq_path_root()
tomoyo_realpath_from_path2()

Of these the only one which needs the " (deleted)" ending is d_path().

sys_getcwd() checks for existence before calling __d_path().

seq_path_root() is used to show the mountpoint path in
/proc/PID/mountinfo, which is always a positive.

And tomoyo doesn't want the deleted ending.

Create a helper "path_with_deleted()" as subsequent patches will need
this in multiple places.

Signed-off-by: Miklos Szeredi <mszeredi(a)suse.cz>
---
fs/dcache.c | 32 ++++++++++++++++++++++----------
1 file changed, 22 insertions(+), 10 deletions(-)

Index: linux-2.6/fs/dcache.c
===================================================================
--- linux-2.6.orig/fs/dcache.c 2010-07-06 18:08:16.000000000 +0200
+++ linux-2.6/fs/dcache.c 2010-07-06 18:08:19.000000000 +0200
@@ -1977,8 +1977,7 @@ global_root:
* @buffer: buffer to return value in
* @buflen: buffer length
*
- * Convert a dentry into an ASCII path name. If the entry has been deleted
- * the string " (deleted)" is appended. Note that this is ambiguous.
+ * Convert a dentry into an ASCII path name.
*
* Returns a pointer into the buffer or an error code if the
* path was too long.
@@ -1995,12 +1994,6 @@ char *__d_path(const struct path *path,
int error;

prepend(&res, &buflen, "\0", 1);
- if (d_unlinked(path->dentry)) {
- error = prepend(&res, &buflen, " (deleted)", 10);
- if (error)
- return ERR_PTR(error);
- }
-
error = prepend_path(path, root, &res, &buflen);
if (error)
return ERR_PTR(error);
@@ -2008,6 +2001,22 @@ char *__d_path(const struct path *path,
return res;
}

+/*
+ * same as __d_path but appends "(deleted)" for unlinked files.
+ */
+static int path_with_deleted(const struct path *path, struct path *root,
+ char **buf, int *buflen)
+{
+ prepend(buf, buflen, "\0", 1);
+ if (d_unlinked(path->dentry)) {
+ int error = prepend(buf, buflen, " (deleted)", 10);
+ if (error)
+ return error;
+ }
+
+ return prepend_path(path, root, buf, buflen);
+}
+
/**
* d_path - return the path of a dentry
* @path: path to report
@@ -2026,9 +2035,10 @@ char *__d_path(const struct path *path,
*/
char *d_path(const struct path *path, char *buf, int buflen)
{
- char *res;
+ char *res = buf + buflen;
struct path root;
struct path tmp;
+ int error;

/*
* We have various synthetic filesystems that never get mounted. On
@@ -2043,7 +2053,9 @@ char *d_path(const struct path *path, ch
get_fs_root(current->fs, &root);
spin_lock(&dcache_lock);
tmp = root;
- res = __d_path(path, &tmp, buf, buflen);
+ error = path_with_deleted(path, &tmp, &res, &buflen);
+ if (error)
+ res = ERR_PTR(error);
spin_unlock(&dcache_lock);
path_put(&root);
return res;

--
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