From: Eric Biggers <ebiggers@xxxxxxxxxx> Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx> --- Documentation/filesystems/vfs.txt | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/Documentation/filesystems/vfs.txt b/Documentation/filesystems/vfs.txt index 33120f220f86f..57fc576b1f3ea 100644 --- a/Documentation/filesystems/vfs.txt +++ b/Documentation/filesystems/vfs.txt @@ -463,6 +463,12 @@ otherwise noted. argument. If request can't be handled without leaving RCU mode, have it return ERR_PTR(-ECHILD). + If the filesystem stores the symlink target in ->i_link, the + VFS may use it directly without calling ->get_link(); however, + ->get_link() must still be provided. ->i_link must not be + freed until after an RCU grace period. Writing to ->i_link + post-iget() time requires a 'release' memory barrier. + readlink: this is now just an override for use by readlink(2) for the cases when ->get_link uses nd_jump_link() or object is not in fact a symlink. Normally filesystems should only implement -- 2.21.0.392.gf8f6787159e-goog
