linux-kernel - [PATCH 1/4] btrfs/ioctl: don't skip accounting in early ENOTTY return

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Message-ID: <20250619192748.3602122-2-csander@purestorage.com>
Date: Thu, 19 Jun 2025 13:27:45 -0600
From: Caleb Sander Mateos <csander@...estorage.com>
To: Chris Mason <clm@...com>,
	Josef Bacik <josef@...icpanda.com>,
	David Sterba <dsterba@...e.com>,
	Jens Axboe <axboe@...nel.dk>
Cc: Mark Harmstone <maharmstone@...com>,
	linux-btrfs@...r.kernel.org,
	io-uring@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Caleb Sander Mateos <csander@...estorage.com>
Subject: [PATCH 1/4] btrfs/ioctl: don't skip accounting in early ENOTTY return

btrfs_uring_encoded_read() returns early with -ENOTTY if the uring_cmd
is issued with IO_URING_F_COMPAT but the kernel doesn't support compat
syscalls. However, this early return bypasses the syscall accounting.
goto out_acct instead to ensure the syscall is counted.

Signed-off-by: Caleb Sander Mateos <csander@...estorage.com>
Fixes: 34310c442e17 ("btrfs: add io_uring command for encoded reads (ENCODED_READ ioctl)")
---
 fs/btrfs/ioctl.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 913acef3f0a9..ff15160e2581 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -4827,11 +4827,12 @@ static int btrfs_uring_encoded_read(struct io_uring_cmd *cmd, unsigned int issue
 
 	if (issue_flags & IO_URING_F_COMPAT) {
 #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
 		copy_end = offsetofend(struct btrfs_ioctl_encoded_io_args_32, flags);
 #else
-		return -ENOTTY;
+		ret = -ENOTTY;
+		goto out_acct;
 #endif
 	} else {
 		copy_end = copy_end_kernel;
 	}
 
-- 
2.45.2