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authorMartin Brandenburg <martin@omnibond.com>2018-05-31 16:36:58 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-06-26 08:08:08 +0800
commit88f36d1b4f0b8163a6b9155e75d9be7d0074d834 (patch)
tree9161e5d7462d5d01e6bb2fd353c211a58608066f
parentaec3dd5ef1f0fb570027fe3a42bbc1d3d1f1828f (diff)
orangefs: set i_size on new symlink
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@clemson.edu> Signed-off-by: Martin Brandenburg <martin@omnibond.com> Fixes: 71680c18c8f2 ("orangefs: Cache getattr results.") Cc: stable@vger.kernel.org Cc: hubcap@omnibond.com Signed-off-by: Mike Marshall <hubcap@omnibond.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--fs/orangefs/namei.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/orangefs/namei.c b/fs/orangefs/namei.c
index 561497a7a247..5fe458628e00 100644
--- a/fs/orangefs/namei.c
+++ b/fs/orangefs/namei.c
@@ -312,6 +312,13 @@ static int orangefs_symlink(struct inode *dir,
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",