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ext4: enforce online defrag restriction for encrypted files 

Online defragging of encrypted files is not currently implemented.
However, the move extent ioctl can still return successfully when
called.  For example, this occurs when xfstest ext4/020 is run on an
encrypted file system, resulting in a corrupted test file and a
corresponding test failure.

Until the proper functionality is implemented, fail the move extent
ioctl if either the original or donor file is encrypted.

Cc: stable@vger.kernel.org
Signed-off-by: Eric Whitney <enwlinux@gmail.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
hifive-unleashed-5.1
Eric Whitney 2016-08-29 15:45:11 -04:00 committed by Theodore Ts'o
parent dfa2064b22
commit 14fbd4aa61
1 changed files with 7 additions and 0 deletions
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7
fs/ext4/move_extent.c
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@ -598,6 +598,13 @@ ext4_move_extents(struct file *o_filp, struct file *d_filp, __u64 orig_blk,
return -EOPNOTSUPP;
}
if (ext4_encrypted_inode(orig_inode) ||
ext4_encrypted_inode(donor_inode)) {
ext4_msg(orig_inode->i_sb, KERN_ERR,
"Online defrag not supported for encrypted files");
return -EOPNOTSUPP;
}
/* Protect orig and donor inodes against a truncate */
lock_two_nondirectories(orig_inode, donor_inode);