vfs: only add " (deleted)" where necessary
__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@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/dcache.c b/fs/dcache.c
index d09d938..7fccb00 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1979,8 +1979,7 @@
* @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.
@@ -1997,12 +1996,6 @@
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);
@@ -2010,6 +2003,22 @@
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
@@ -2028,9 +2037,10 @@
*/
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
@@ -2045,7 +2055,9 @@
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;