Change calling conventions for filldir_t
filldir_t instances (directory iterators callbacks) used to return 0 for
"OK, keep going" or -E... for "stop". Note that it's *NOT* how the
error values are reported - the rules for those are callback-dependent
and ->iterate{,_shared}() instances only care about zero vs. non-zero
(look at emit_dir() and friends).
So let's just return bool ("should we keep going?") - it's less confusing
that way. The choice between "true means keep going" and "true means
stop" is bikesheddable; we have two groups of callbacks -
do something for everything in directory, until we run into problem
and
find an entry in directory and do something to it.
The former tended to use 0/-E... conventions - -E<something> on failure.
The latter tended to use 0/1, 1 being "stop, we are done".
The callers treated anything non-zero as "stop", ignoring which
non-zero value did they get.
"true means stop" would be more natural for the second group; "true
means keep going" - for the first one. I tried both variants and
the things like
if allocation failed
something = -ENOMEM;
return true;
just looked unnatural and asking for trouble.
[folded suggestion from Matthew Wilcox <willy@infradead.org>]
Acked-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
index 9751cc9..6785a9c 100644
--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -3779,7 +3779,7 @@ static int reserve_populate_dentry(struct ksmbd_dir_info *d_info,
return 0;
}
-static int __query_dir(struct dir_context *ctx, const char *name, int namlen,
+static bool __query_dir(struct dir_context *ctx, const char *name, int namlen,
loff_t offset, u64 ino, unsigned int d_type)
{
struct ksmbd_readdir_data *buf;
@@ -3793,22 +3793,20 @@ static int __query_dir(struct dir_context *ctx, const char *name, int namlen,
/* dot and dotdot entries are already reserved */
if (!strcmp(".", name) || !strcmp("..", name))
- return 0;
+ return true;
if (ksmbd_share_veto_filename(priv->work->tcon->share_conf, name))
- return 0;
+ return true;
if (!match_pattern(name, namlen, priv->search_pattern))
- return 0;
+ return true;
d_info->name = name;
d_info->name_len = namlen;
rc = reserve_populate_dentry(d_info, priv->info_level);
if (rc)
- return rc;
- if (d_info->flags & SMB2_RETURN_SINGLE_ENTRY) {
+ return false;
+ if (d_info->flags & SMB2_RETURN_SINGLE_ENTRY)
d_info->out_buf_len = 0;
- return 0;
- }
- return 0;
+ return true;
}
static void restart_ctx(struct dir_context *ctx)
