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authorLorenz Bauer <lmb@cloudflare.com>2021-10-28 10:47:22 +0100
committerDaniel Borkmann <daniel@iogearbox.net>2021-11-03 15:43:08 +0100
commit3871cb8cf741dcd8ebaec4f960be9479da2f176b (patch)
treea26293e5a380349df45fb4fb41f404112b0bade6 /fs/libfs.c
parent6429e46304ac7820eebbea2bf5d73b90c18e0e06 (diff)
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.c5
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;