From: Geert Uytterhoeven <geert-Td1EMuHUCqxL1ZNQvxDV9g@public.gmane.org>
To: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: "David S. Miller" <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>,
pablo-Cap9r6Oaw4JrovVCs/uTlw@public.gmane.org,
Patrick McHardy <kaber-dcUjhNyLwpNeoWH0uzbU5w@public.gmane.org>,
kadlec-K40Dz/62t/MgiyqX0sVFJYdd74u8MsAO@public.gmane.org,
Daniel Borkmann <daniel-FeC+5ew28dpmcu3hnIyYJQ@public.gmane.org>,
daniel.wagner-98C5kh4wR6ohFhg+JK9F0w@public.gmane.org,
nhorman-2XuSBdqkA4R54TAoqtyWWQ@public.gmane.org,
Zefan Li <lizefan-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>,
Johannes Weiner <hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org>,
"netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
netfilter-devel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
coreteam-Cap9r6Oaw4JrovVCs/uTlw@public.gmane.org,
cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
"linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
kernel-team-b10kYP2dOMg@public.gmane.org,
ninasc-b10kYP2dOMg@public.gmane.org,
Josh Triplett <josh-iaAMLnmF4UmaiuxdJuQwMA@public.gmane.org>
Subject: Re: [PATCH 2/8] kernfs: implement kernfs_walk_and_get()
Date: Fri, 15 Jan 2016 13:29:06 +0100 [thread overview]
Message-ID: <CAMuHMdXT63aJ2hXJg9mtMv-PZYT7CEw+ab-j42_VoFB-ib+ghg@mail.gmail.com> (raw)
In-Reply-To: <1449527935-27056-3-git-send-email-tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
On Mon, Dec 7, 2015 at 11:38 PM, Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> wrote:
> Implement kernfs_walk_and_get() which is similar to
> kernfs_find_and_get() but can walk a path instead of just a name.
>
> v2: Use strlcpy() instead of strlen() + memcpy() as suggested by
> David.
>
> Signed-off-by: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
> Acked-by: Greg Kroah-Hartman <gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org>
> Cc: David Miller <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
> ---
> fs/kernfs/dir.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
> include/linux/kernfs.h | 12 ++++++++++++
> 2 files changed, 58 insertions(+)
>
> diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c
> index 91e0045..742bf4a 100644
> --- a/fs/kernfs/dir.c
> +++ b/fs/kernfs/dir.c
> @@ -694,6 +694,29 @@ static struct kernfs_node *kernfs_find_ns(struct kernfs_node *parent,
> return NULL;
> }
>
> +static struct kernfs_node *kernfs_walk_ns(struct kernfs_node *parent,
> + const unsigned char *path,
> + const void *ns)
> +{
> + static char path_buf[PATH_MAX]; /* protected by kernfs_mutex */
This is showing up in bloat-o-meter as increasing kernel size by 4 KiB.
> + size_t len = strlcpy(path_buf, path, PATH_MAX);
The full input string is copied because strsep() replaces the delimiters by
zeroes?
Can this be handled in some other way?
> + char *p = path_buf;
> + char *name;
> +
> + lockdep_assert_held(&kernfs_mutex);
> +
> + if (len >= PATH_MAX)
> + return NULL;
> +
> + while ((name = strsep(&p, "/")) && parent) {
> + if (*name == '\0')
> + continue;
> + parent = kernfs_find_ns(parent, name, ns);
> + }
> +
> + return parent;
> +}
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert-Td1EMuHUCqxL1ZNQvxDV9g@public.gmane.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
next prev parent reply other threads:[~2016-01-15 12:29 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-07 22:38 [PATCHSET v4] netfilter, cgroup: implement cgroup2 path match in xt_cgroup Tejun Heo
2015-12-07 22:38 ` [PATCH 1/8] cgroup: record ancestor IDs and reimplement cgroup_is_descendant() using it Tejun Heo
2015-12-07 22:38 ` [PATCH 2/8] kernfs: implement kernfs_walk_and_get() Tejun Heo
[not found] ` <1449527935-27056-3-git-send-email-tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2016-01-15 12:29 ` Geert Uytterhoeven [this message]
2016-01-15 17:30 ` [PATCH] kernfs: make kernfs_walk_ns() use kernfs_pr_cont_buf[] Tejun Heo
[not found] ` <20160115173014.GI3520-qYNAdHglDFBN0TnZuCh8vA@public.gmane.org>
2016-01-15 22:05 ` Greg Kroah-Hartman
[not found] ` <1449527935-27056-1-git-send-email-tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2015-12-07 22:38 ` [PATCH 3/8] cgroup: implement cgroup_get_from_path() and expose cgroup_put() Tejun Heo
[not found] ` <1449527935-27056-4-git-send-email-tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2015-12-22 0:22 ` Serge E. Hallyn
2015-12-22 18:13 ` Tejun Heo
2015-12-07 22:38 ` [PATCH 4/8] netprio_cgroup: limit the maximum css->id to USHRT_MAX Tejun Heo
2015-12-09 3:03 ` [PATCHSET v4] netfilter, cgroup: implement cgroup2 path match in xt_cgroup David Miller
2015-12-07 22:38 ` [PATCH 5/8] net: wrap sock->sk_cgrp_prioidx and ->sk_classid inside a struct Tejun Heo
2015-12-07 22:38 ` [PATCH 6/8] sock, cgroup: add sock->sk_cgroup Tejun Heo
2015-12-07 22:38 ` [PATCH 7/8] netfilter: prepare xt_cgroup for multi revisions Tejun Heo
2015-12-14 19:35 ` Pablo Neira Ayuso
2015-12-07 22:38 ` [PATCH 8/8] netfilter: implement xt_cgroup cgroup2 path match Tejun Heo
2015-12-14 19:37 ` Pablo Neira Ayuso
[not found] ` <1449527935-27056-9-git-send-email-tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2016-02-12 0:10 ` Alban Crequy
[not found] ` <CAMXgnP7Eue2NQrUcRSNgM8NJT5XOscPWwqVkuh7LnwQn-1oQ_A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-02-12 16:05 ` Tejun Heo
2015-12-14 11:54 ` [PATCHSET v4] netfilter, cgroup: implement cgroup2 path match in xt_cgroup Dexuan Cui
2015-12-14 16:24 ` [PATCH net-next] net, cgroup: cgroup_sk_updat_lock was missing initializer Tejun Heo
2015-12-14 19:20 ` David Miller
[not found] ` <20151214.142043.1185024338854399910.davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
2015-12-15 2:11 ` Dexuan Cui
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