4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Martin Brandenburg <martin@xxxxxxxxxxxx>
commit f6a4b4c9d07dda90c7c29dae96d6119ac6425dca upstream.
As long as a symlink inode remains in-core, the destination (and
therefore size) will not be re-fetched from the server, as it cannot
change. The original implementation of the attribute cache assumed that
setting the expiry time in the past was sufficient to cause a re-fetch
of all attributes on the next getattr. That does not work in this case.
The bug manifested itself as follows. When the command sequence
touch foo; ln -s foo bar; ls -l bar
is run, the output was
lrwxrwxrwx. 1 fedora fedora 4906 Apr 24 19:10 bar -> foo
However, after a re-mount, ls -l bar produces
lrwxrwxrwx. 1 fedora fedora 3 Apr 24 19:10 bar -> foo
After this commit, even before a re-mount, the output is
lrwxrwxrwx. 1 fedora fedora 3 Apr 24 19:10 bar -> foo
Reported-by: Becky Ligon <ligon@xxxxxxxxxxx>
Signed-off-by: Martin Brandenburg <martin@xxxxxxxxxxxx>
Fixes: 71680c18c8f2 ("orangefs: Cache getattr results.")
Cc: stable@xxxxxxxxxxxxxxx
Cc: hubcap@xxxxxxxxxxxx
Signed-off-by: Mike Marshall <hubcap@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/orangefs/namei.c | 7 +++++++
1 file changed, 7 insertions(+)
--- a/fs/orangefs/namei.c
+++ b/fs/orangefs/namei.c
@@ -312,6 +312,13 @@ static int orangefs_symlink(struct inode
ret = PTR_ERR(inode);
goto out;
}
+ /*
+ * This is necessary because orangefs_inode_getattr will not
+ * re-read symlink size as it is impossible for it to change.
+ * Invalidating the cache does not help. orangefs_new_inode
+ * does not set the correct size (it does not know symname).
+ */
+ inode->i_size = strlen(symname);
gossip_debug(GOSSIP_NAME_DEBUG,
"Assigned symlink inode new number of %pU\n",
