[38/39] css_set_fork(): switch to CLASS(fd_raw, ...)

Message ID	20240730051625.14349-38-viro@kernel.org (mailing list archive)
State	New, archived
Headers	show Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A234A1A01CC; Tue, 30 Jul 2024 05:15:22 +0000 (UTC) From: viro@kernel.org To: linux-fsdevel@vger.kernel.org Cc: amir73il@gmail.com, bpf@vger.kernel.org, brauner@kernel.org, cgroups@vger.kernel.org, kvm@vger.kernel.org, netdev@vger.kernel.org, torvalds@linux-foundation.org Subject: [PATCH 38/39] css_set_fork(): switch to CLASS(fd_raw, ...) Date: Tue, 30 Jul 2024 01:16:24 -0400 Message-Id: <20240730051625.14349-38-viro@kernel.org> In-Reply-To: <20240730051625.14349-1-viro@kernel.org> References: <20240730050927.GC5334@ZenIV> <20240730051625.14349-1-viro@kernel.org> Precedence: bulk MIME-Version: 1.0 Content-Transfer-Encoding: 8bit
Series	[01/39] memcg_write_event_control(): fix a user-triggerable oops \| expand [01/39] memcg_write_event_control(): fix a user-triggerable oops [02/39] introduce fd_file(), convert all accessors to it. [03/39] struct fd: representation change [04/39] add struct fd constructors, get rid of __to_fd() [05/39] regularize emptiness checks in fini_module(2) and vfs_dedupe_file_range() [06/39] net/socket.c: switch to CLASS(fd) [07/39] introduce struct fderr, convert overlayfs uses to that [08/39] experimental: convert fs/overlayfs/file.c to CLASS(...) [09/39] timerfd: switch to CLASS(fd, ...) [10/39] get rid of perf_fget_light(), convert kernel/events/core.c to CLASS(fd) [11/39] switch netlink_getsockbyfilp() to taking descriptor [12/39] do_mq_notify(): saner skb freeing on failures [13/39] do_mq_notify(): switch to CLASS(fd, ...) [14/39] simplify xfs_find_handle() a bit [15/39] convert vmsplice() to CLASS(fd, ...) [16/39] convert __bpf_prog_get() to CLASS(fd, ...) [17/39] bpf: resolve_pseudo_ldimm64(): take handling of a single ldimm64 insn into helper [18/39] bpf maps: switch to CLASS(fd, ...) [19/39] fdget_raw() users: switch to CLASS(fd_raw, ...) [20/39] introduce "fd_pos" class, convert fdget_pos() users to it. [21/39] o2hb_region_dev_store(): avoid goto around fdget()/fdput() [22/39] privcmd_ioeventfd_assign(): don't open-code eventfd_ctx_fdget() [23/39] fdget(), trivial conversions [24/39] fdget(), more trivial conversions [25/39] convert do_preadv()/do_pwritev() [26/39] convert cachestat(2) [27/39] switch spufs_calls_{get,put}() to CLASS() use [28/39] convert spu_run(2) [29/39] convert media_request_get_by_fd() [30/39] convert coda_parse_fd() [31/39] convert cifs_ioctl_copychunk() [32/39] convert vfs_dedupe_file_range(). [33/39] convert do_select() [34/39] do_pollfd(): convert to CLASS(fd) [35/39] convert bpf_token_create() [36/39] assorted variants of irqfd setup: convert to CLASS(fd) [37/39] memcg_write_event_control(): switch to CLASS(fd) [38/39] css_set_fork(): switch to CLASS(fd_raw, ...) [39/39] deal with the last remaing boolean uses of fd_file()

Message ID

20240730051625.14349-38-viro@kernel.org (mailing list archive)

State

New, archived

Headers

From: viro@kernel.org
To: linux-fsdevel@vger.kernel.org
Cc: amir73il@gmail.com,
	bpf@vger.kernel.org,
	brauner@kernel.org,
	cgroups@vger.kernel.org,
	kvm@vger.kernel.org,
	netdev@vger.kernel.org,
	torvalds@linux-foundation.org
Subject: [PATCH 38/39] css_set_fork(): switch to CLASS(fd_raw, ...)
Date: Tue, 30 Jul 2024 01:16:24 -0400
Message-Id: <20240730051625.14349-38-viro@kernel.org>
In-Reply-To: <20240730051625.14349-1-viro@kernel.org>
References: <20240730050927.GC5334@ZenIV>
 <20240730051625.14349-1-viro@kernel.org>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit

Series

[01/39] memcg_write_event_control(): fix a user-triggerable oops | expand

Commit Message

Al Viro July 30, 2024, 5:16 a.m. UTC

From: Al Viro <viro@zeniv.linux.org.uk>

reference acquired there by fget_raw() is not stashed anywhere -
we could as well borrow instead.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 kernel/cgroup/cgroup.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

Comments

Christian Brauner Aug. 7, 2024, 10:47 a.m. UTC | #1

On Tue, Jul 30, 2024 at 01:16:24AM GMT, viro@kernel.org wrote:
> From: Al Viro <viro@zeniv.linux.org.uk>
> 
> reference acquired there by fget_raw() is not stashed anywhere -
> we could as well borrow instead.
> 
> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
> ---

Reviewed-by: Christian Brauner <brauner@kernel.org>

diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index 1244a8c8878e..0838301e4f65 100644
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -6409,7 +6409,6 @@  static int cgroup_css_set_fork(struct kernel_clone_args *kargs)
 	struct cgroup *dst_cgrp = NULL;
 	struct css_set *cset;
 	struct super_block *sb;
-	struct file *f;
 
 	if (kargs->flags & CLONE_INTO_CGROUP)
 		cgroup_lock();
@@ -6426,14 +6425,14 @@  static int cgroup_css_set_fork(struct kernel_clone_args *kargs)
 		return 0;
 	}
 
-	f = fget_raw(kargs->cgroup);
-	if (!f) {
+	CLASS(fd_raw, f)(kargs->cgroup);
+	if (fd_empty(f)) {
 		ret = -EBADF;
 		goto err;
 	}
-	sb = f->f_path.dentry->d_sb;
+	sb = fd_file(f)->f_path.dentry->d_sb;
 
-	dst_cgrp = cgroup_get_from_file(f);
+	dst_cgrp = cgroup_get_from_file(fd_file(f));
 	if (IS_ERR(dst_cgrp)) {
 		ret = PTR_ERR(dst_cgrp);
 		dst_cgrp = NULL;
@@ -6481,15 +6480,12 @@  static int cgroup_css_set_fork(struct kernel_clone_args *kargs)
 	}
 
 	put_css_set(cset);
-	fput(f);
 	kargs->cgrp = dst_cgrp;
 	return ret;
 
 err:
 	cgroup_threadgroup_change_end(current);
 	cgroup_unlock();
-	if (f)
-		fput(f);
 	if (dst_cgrp)
 		cgroup_put(dst_cgrp);
 	put_css_set(cset);

[38/39] css_set_fork(): switch to CLASS(fd_raw, ...)

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