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-rw-r--r--fs/ntfs/file.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/fs/ntfs/file.c b/fs/ntfs/file.c
index cf2a0e2330df..5fb341a16b52 100644
--- a/fs/ntfs/file.c
+++ b/fs/ntfs/file.c
@@ -1857,10 +1857,24 @@ static ssize_t ntfs_file_buffered_write(struct kiocb *iocb,
if (ni->type != AT_INDEX_ALLOCATION) {
/* If file is encrypted, deny access, just like NT4. */
if (NInoEncrypted(ni)) {
+ /*
+ * Reminder for later: Encrypted files are _always_
+ * non-resident so that the content can always be
+ * encrypted.
+ */
ntfs_debug("Denying write access to encrypted file.");
return -EACCES;
}
if (NInoCompressed(ni)) {
+ /* Only unnamed $DATA attribute can be compressed. */
+ BUG_ON(ni->type != AT_DATA);
+ BUG_ON(ni->name_len);
+ /*
+ * Reminder for later: If resident, the data is not
+ * actually compressed. Only on the switch to non-
+ * resident does compression kick in. This is in
+ * contrast to encrypted files (see above).
+ */
ntfs_error(vi->i_sb, "Writing to compressed files is "
"not implemented yet. Sorry.");
return -EOPNOTSUPP;