[PATCH bpf-next v3 2/4] libfs: support RENAME_EXCHANGE in simple_rename()
flat view
STALE1801d
LANDED
From: Lorenz Bauer <hidden>
Date: 2021-10-28 09:48:27
Also in:
bpf, linux-fsdevel, lkml
Subsystem:
filesystems (vfs and infrastructure), the rest · Maintainers:
Alexander Viro, Christian Brauner, Linus Torvalds
Revision v3 of 3 in this series; landed in mainline as 3871cb8cf741 on 2021-11-03.
Revisions (3)
- v1 [diff vs current]
- v2 [diff vs current]
- v3 current
Allow atomic exchange via RENAME_EXCHANGE when using simple_rename. This affects binderfs, ramfs, hubetlbfs and bpffs. Signed-off-by: Lorenz Bauer <redacted> --- 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