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-rw-r--r--Documentation/filesystems/porting6
1 files changed, 5 insertions, 1 deletions
diff --git a/Documentation/filesystems/porting b/Documentation/filesystems/porting
index 0f88e6020487..f1b87d8aa2da 100644
--- a/Documentation/filesystems/porting
+++ b/Documentation/filesystems/porting
@@ -508,7 +508,11 @@ in your dentry operations instead.
[mandatory]
any symlink that might use page_follow_link_light/page_put_link() must
have inode_nohighmem(inode) called before anything might start playing with
- its pagecache.
+ its pagecache. No highmem pages should end up in the pagecache of such
+ symlinks. That includes any preseeding that might be done during symlink
+ creation. __page_symlink() will honour the mapping gfp flags, so once
+ you've done inode_nohighmem() it's safe to use, but if you allocate and
+ insert the page manually, make sure to use the right gfp flags.
--
[mandatory]
->follow_link() is replaced with ->get_link(); same API, except that