Bug 448797

Description of problem:
File created in an ecryptfs overlay atop an nfs share disappear.

Two machines involved: "server" is an nfs server, sharing out "/data", "client"
is a workstation mounting /data from server.

The client has /data mounted from the server, and now creates a directory
/data/encrypted, and proceeds to mount an ecryptfs overlay atop /data/encrypted
(using selinux xattr work-around in bug 448787):

[client]# mount -t ecryptfs /data/encrypted /data/encrypted -o
context=system_u:object_r:user_home_t:s0
Select key type to use for newly created files: 
 1) openssl
 2) passphrase
Selection: 2
Passphrase: 
Verify Passphrase: 
Select cipher: 
 1) aes: blocksize = 16; min keysize = 16; max keysize = 32 (loaded)
 2) blowfish: blocksize = 16; min keysize = 16; max keysize = 32 (not loaded)
 3) des3_ede: blocksize = 8; min keysize = 24; max keysize = 24 (not loaded)
 4) twofish: blocksize = 16; min keysize = 16; max keysize = 32 (not loaded)
 5) cast6: blocksize = 16; min keysize = 16; max keysize = 32 (not loaded)
 6) cast5: blocksize = 8; min keysize = 5; max keysize = 16 (not loaded)
Selection [aes]: 
Select key bytes: 
 1) 16
 2) 32
 3) 24
Selection [16]: 2
Enable plaintext passthrough (y/n): n
Attempting to mount with the following options:
  ecryptfs_key_bytes=32
  ecryptfs_cipher=aes
  ecryptfs_sig=92868a6a72b0202e
Mounted eCryptfs

[client]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda5              41G  1.6G   37G   5% /
/dev/sda1             190M   29M  152M  16% /boot
tmpfs                 437M     0  437M   0% /dev/shm
xenon:/data           101G   41G   55G  43% /data
/data/encrypted       101G   41G   55G  43% /data/encrypted

[client]# echo "wasabi" > /data/encrypted/foo

[client]# ll
total 12
-rw-r--r-- 1 root root 7 May 28 15:57 foo

----WAIT A MINUTE OR TWO----

[client]# ll
total 0

???

At this point, an ll on the server side works just fine, shows the encrypted
file and everything. Oddly enough, trying to cat the file client-side actually
still works.

Unmounting the ecryptfs overlay reveals the file to ls again. Re-mounting the
ecryptfs overlay results in the file being there for one ls iteration, then
disappearing again.


Version-Release number of selected component (if applicable):
kernel-2.6.18-92.el5
ecryptfs-utils-41-1.el5