fsnotify: add FSNOTIFY_EVENT_RENAME data type

Add a new fsnotify_rename_data struct and FSNOTIFY_EVENT_RENAME data
type that carries both the moved dentry and the inode that was
overwritten by the rename (if any).

Update fsnotify_data_inode(), fsnotify_data_dentry(), and
fsnotify_data_sb() to handle the new type, and add a new
fsnotify_data_rename_target() helper for extracting the overwritten
target inode.

Update fsnotify_move() to use the new data type for FS_RENAME and
FS_MOVED_TO events, passing the overwritten target inode through the
event data. FS_MOVED_FROM is unchanged since the source directory
doesn't need overwrite information.

This is done so that fsnotify consumers like nfsd can atomically
observe the overwritten file when a rename replaces an existing entry,
without needing a separate FS_DELETE event.

Assisted-by: Claude (Anthropic Claude Code)
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Link: https://patch.msgid.link/20260428-dir-deleg-v3-7-5a0780ba9def@kernel.org
Acked-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>

0 files changed, 0 insertions, 0 deletions