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user_statfs(): import pathname only once

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Convert the user_path_at() call inside a retry loop into getname_flags() +
filename_lookup() + putname() and leave only filename_lookup() inside
the loop.

In this case we never pass LOOKUP_EMPTY, so getname_flags() is equivalent
to plain getname().

The things could be further simplified by use of cleanup.h stuff, but
let's not clutter the patch with that.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2025-11-01 00:48:31 -04:00
parent c3fa2b7cf5
commit 85a4fe3c99
1 changed files with 3 additions and 1 deletions
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4
fs/statfs.c
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@ -99,8 +99,9 @@ int user_statfs(const char __user *pathname, struct kstatfs *st)
struct path path;
int error;
unsigned int lookup_flags = LOOKUP_FOLLOW|LOOKUP_AUTOMOUNT;
struct filename *name = getname(pathname);
retry:
error = user_path_at(AT_FDCWD, pathname, lookup_flags, &path);
error = filename_lookup(AT_FDCWD, name, lookup_flags, &path, NULL);
if (!error) {
error = vfs_statfs(&path, st);
path_put(&path);
@ -109,6 +110,7 @@ int user_statfs(const char __user *pathname, struct kstatfs *st)
goto retry;
}
}
putname(name);
return error;
}