A few days ago, a batch process I was running accidentally exhausted
100% of my partition's storage. One directory on this partition is
encrypted with dm-crypt.
After killing the process, I tried to free up some space by deleting
files from the encrypted directory. Strangely, after RM-ing ~4 GB of
files, I noticed that "df -h" showed that there wasn't any additional
free space.
df's "Used" column value was decreasing, but the "Avail" column wasn't
increasing.
When I RM-ed files outside of the encrypted directory (but on the same
partition), "df -h" behaved normally (with "Used" decreasing as
"Avail" increased).
dmesg had many messages of the type:
[ 140.267890] ecryptfs_encrypt_page: Error attempting to write lower
page; rc = [-28]
[ 140.267894] ecryptfs_write_end: Error encrypting page (upper index
[0x0000000000000000])
Those messages stopped appearing (after space was freed and I
rebooted), but now there are intermittent messages of the type:
[18819.518304] Valid eCryptfs headers not found in file header region
or xattr region
[18819.518311] Either the lower file is not in a valid eCryptfs
format, or the key could not be retrieved. Plaintext passthrough mode
is not enabled; returning -EIO
As of now, dm-crypt seems to be working fine, and all the encrypted
files (that i know of) are completely accessible.
However, the dmesg warning still appears intermittently (is there any
way to identify what file access is causing it?).
** More importantly, the ~4 GB of files (that I deleted during the
out-of-storage event), seems to have vanished from accessible storage:
$ df -h
...
/var/encrypted/.Private
74G 40G 30G 58% /var/encrypted
...
Any advice?
Best,
Nick
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