[26/39] convert cachestat(2)

Message ID	20240730051625.14349-26-viro@kernel.org (mailing list archive)
State	Not Applicable
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 A5033198E88; Tue, 30 Jul 2024 05:15:11 +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 26/39] convert cachestat(2) Date: Tue, 30 Jul 2024 01:16:12 -0400 Message-Id: <20240730051625.14349-26-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

20240730051625.14349-26-viro@kernel.org (mailing list archive)

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Not Applicable

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 26/39] convert cachestat(2)
Date: Tue, 30 Jul 2024 01:16:12 -0400
Message-Id: <20240730051625.14349-26-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

Context	Check	Description
netdev/tree_selection	success	Guessing tree name failed - patch did not apply, async

Context

Check

Description

netdev/tree_selection

success

Guessing tree name failed - patch did not apply, async

From: Al Viro <viro@zeniv.linux.org.uk> fdput() can be transposed with copy_to_user() Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> --- mm/filemap.c | 17 +++++------------ 1 file changed, 5 insertions(+), 12 deletions(-)

Comments

Christian Brauner Aug. 7, 2024, 10:39 a.m. UTC | #1

On Tue, Jul 30, 2024 at 01:16:12AM GMT, viro@kernel.org wrote:
> From: Al Viro <viro@zeniv.linux.org.uk>
> 
> fdput() can be transposed with copy_to_user()
> 
> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
> ---

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

diff --git a/mm/filemap.c b/mm/filemap.c
index 0b5cbd644fdd..9ef41935b0a7 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -4387,31 +4387,25 @@  SYSCALL_DEFINE4(cachestat, unsigned int, fd,
 		struct cachestat_range __user *, cstat_range,
 		struct cachestat __user *, cstat, unsigned int, flags)
 {
-	struct fd f = fdget(fd);
+	CLASS(fd, f)(fd);
 	struct address_space *mapping;
 	struct cachestat_range csr;
 	struct cachestat cs;
 	pgoff_t first_index, last_index;
 
-	if (!fd_file(f))
+	if (fd_empty(f))
 		return -EBADF;
 
 	if (copy_from_user(&csr, cstat_range,
-			sizeof(struct cachestat_range))) {
-		fdput(f);
+			sizeof(struct cachestat_range)))
 		return -EFAULT;
-	}
 
 	/* hugetlbfs is not supported */
-	if (is_file_hugepages(fd_file(f))) {
-		fdput(f);
+	if (is_file_hugepages(fd_file(f)))
 		return -EOPNOTSUPP;
-	}
 
-	if (flags != 0) {
-		fdput(f);
+	if (flags != 0)
 		return -EINVAL;
-	}
 
 	first_index = csr.off >> PAGE_SHIFT;
 	last_index =
@@ -4419,7 +4413,6 @@  SYSCALL_DEFINE4(cachestat, unsigned int, fd,
 	memset(&cs, 0, sizeof(struct cachestat));
 	mapping = fd_file(f)->f_mapping;
 	filemap_cachestat(mapping, first_index, last_index, &cs);
-	fdput(f);
 
 	if (copy_to_user(cstat, &cs, sizeof(struct cachestat)))
 		return -EFAULT;

[26/39] convert cachestat(2)

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