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Message-Id: <20211028094724.59043-3-lmb@cloudflare.com> Date: Thu, 28 Oct 2021 10:47:22 +0100 From: Lorenz Bauer <lmb@...udflare.com> To: viro@...iv.linux.org.uk, Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, Andrii Nakryiko <andrii@...nel.org> Cc: mszeredi@...hat.com, gregkh@...uxfoundation.org, Lorenz Bauer <lmb@...udflare.com>, linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, bpf@...r.kernel.org Subject: [PATCH bpf-next v3 2/4] libfs: support RENAME_EXCHANGE in simple_rename() Allow atomic exchange via RENAME_EXCHANGE when using simple_rename. This affects binderfs, ramfs, hubetlbfs and bpffs. Signed-off-by: Lorenz Bauer <lmb@...udflare.com> --- fs/libfs.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/fs/libfs.c b/fs/libfs.c index 1cf144dc9ed2..ba7438ab9371 100644 --- a/fs/libfs.c +++ b/fs/libfs.c @@ -479,9 +479,12 @@ int simple_rename(struct user_namespace *mnt_userns, struct inode *old_dir, struct inode *inode = d_inode(old_dentry); int they_are_dirs = d_is_dir(old_dentry); - if (flags & ~RENAME_NOREPLACE) + if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE)) return -EINVAL; + if (flags & RENAME_EXCHANGE) + return simple_rename_exchange(old_dir, old_dentry, new_dir, new_dentry); + if (!simple_empty(new_dentry)) return -ENOTEMPTY; -- 2.32.0
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