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authorAl Viro <viro@zeniv.linux.org.uk>2015-05-11 15:29:30 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2015-05-15 08:10:36 +0300
commit203bc643db59e2538e9a3f19be1636cdfd2bb2db (patch)
tree370610d82cc68a796c8a48eda8b70ba1171039d5 /Documentation/filesystems/porting
parent8f47a0167c567de4ef552e26101b4f54a9b8ad48 (diff)
downloadlinux-203bc643db59e2538e9a3f19be1636cdfd2bb2db.tar.xz
update Documentation/filesystems/ regarding the follow_link/put_link changes
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'Documentation/filesystems/porting')
-rw-r--r--Documentation/filesystems/porting17
1 files changed, 17 insertions, 0 deletions
diff --git a/Documentation/filesystems/porting b/Documentation/filesystems/porting
index e69274de8d0c..3eae250254d5 100644
--- a/Documentation/filesystems/porting
+++ b/Documentation/filesystems/porting
@@ -483,3 +483,20 @@ in your dentry operations instead.
--
[mandatory]
->aio_read/->aio_write are gone. Use ->read_iter/->write_iter.
+---
+[recommended]
+ for embedded ("fast") symlinks just set inode->i_link to wherever the
+ symlink body is and use simple_follow_link() as ->follow_link().
+--
+[mandatory]
+ calling conventions for ->follow_link() have changed. Instead of returning
+ cookie and using nd_set_link() to store the body to traverse, we return
+ the body to traverse and store the cookie using explicit void ** argument.
+ nameidata isn't passed at all - nd_jump_link() doesn't need it and
+ nd_[gs]et_link() is gone.
+--
+[mandatory]
+ calling conventions for ->put_link() have changed. It gets inode instead of
+ dentry, it does not get nameidata at all and it gets called only when cookie
+ is non-NULL. Note that link body isn't available anymore, so if you need it,
+ store it as cookie.