diff options
| author |   Lorenz Bauer <lmb@cloudflare.com> | 2021-10-28 10:47:22 +0100 |
|---|---|---|
| committer |   Daniel Borkmann <daniel@iogearbox.net> | 2021-11-03 15:43:08 +0100 |
| commit | 3871cb8cf741dcd8ebaec4f960be9479da2f176b (patch) | |
| tree | a26293e5a380349df45fb4fb41f404112b0bade6 /fs/libfs.c | |
| parent | libfs: Move shmem_exchange to simple_rename_exchange (diff) | |
| download | linux-dev-3871cb8cf741dcd8ebaec4f960be9479da2f176b.tar.xz linux-dev-3871cb8cf741dcd8ebaec4f960be9479da2f176b.zip | |
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@cloudflare.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Miklos Szeredi <mszeredi@redhat.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/bpf/20211028094724.59043-3-lmb@cloudflare.com
Diffstat (limited to 'fs/libfs.c')
| -rw-r--r-- | fs/libfs.c | 5 |
1 files changed, 4 insertions, 1 deletions
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; |