** Changed in: linux (Ubuntu)
Status: Triaged => Fix Committed
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https://bugs.launchpad.net/bugs/1222442
Title:
Linux kernel regression: Links on CIFS shares
Status in “linux” package in Ubuntu:
Fix Committed
Bug description:
After upgrading from (Ubuntu) kernel version 3.2.0-45-generic to
3.2.0-48-generic on Ubuntu Precise (x86_64), links on CIFS shares are
broken. The used setup is the following:
Clients running Ubuntu Precise mount a CIFS share with
mount -t cifs -o
sec=krb5,multiuser,cifsacl,serverino,nobrl,nounix,cruid=xyz,mfsymlinks
//srv.example.com /mnt/cifs
Issuing the following commands
touch hello
ln -s hello hello2
ls -l
on the mounted CIFS share results in the output
ls: cannot read symbolic link hello2: Invalid argument
total 1024
-rwxr-xr-x 0 user group 0 Sep 8 16:36 hello
lrwxrwxrwx 1 user group 5 Sep 8 16:36 hello2
for kernel versions >= 3.2.0-48-generic. Running "less hello2" yields:
hello2 is not a regular file (use -f to see it)
Using "less -f hello2" changes the error message to
hello2: Too many levels of symbolic links
Some of our users only see this problem if there is at least one
reboot of the client between link creation and link access.
The problem can be traced back to the following kernel code change:
-------------------------------------------------------------------------------------------------------
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index e851d5b..20431b4 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -173,7 +173,8 @@ cifs_fattr_to_inode(struct inode *inode, struct
cifs_fattr *fattr)
if (fattr->cf_flags & CIFS_FATTR_DFS_REFERRAL)
inode->i_flags |= S_AUTOMOUNT;
- cifs_set_ops(inode);
+ if (inode->i_state & I_NEW)
+ cifs_set_ops(inode);
}
void
-------------------------------------------------------------------------------------------------------
Reverting this change fixes the problem.
Another way to get rid of the error is to remove the "nounix" and
"mksymlinks" mount options but this slows down the setup such that it
becomes practically useless.
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