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Subject[PATCH 22/25] NTFS: Fixup handling of sparse, compressed, and encrypted attributes in
[PATCH 22/25] NTFS: Fixup handling of sparse, compressed, and encrypted attributes in
fs/ntfs/aops.c::ntfs_readpage().

Signed-off-by: Anton Altaparmakov <aia21@cantab.net>

---
fs/ntfs/ChangeLog | 5 ++---
fs/ntfs/aops.c | 41 ++++++++++++++++++++++++-----------------
2 files changed, 26 insertions(+), 20 deletions(-)
311120eca0013083f5eb0aff13ffb8aa9fdd050c
diff --git a/fs/ntfs/ChangeLog b/fs/ntfs/ChangeLog
--- a/fs/ntfs/ChangeLog
+++ b/fs/ntfs/ChangeLog
@@ -76,11 +76,10 @@ ToDo/Notes:
- Truncate {a,c,m}time to the ntfs supported time granularity when
updating the times in the inode in ntfs_setattr().
- Fixup handling of sparse, compressed, and encrypted attributes in
- fs/ntfs/inode.c::ntfs_read_locked_{,attr_,index_}inode().
+ fs/ntfs/inode.c::ntfs_read_locked_{,attr_,index_}inode(),
+ fs/ntfs/aops.c::ntfs_{read,write}page().
- Make ntfs_write_block() not instantiate sparse blocks if they contain
only zeroes.
- - Fixup handling of sparse, compressed, and encrypted attributes in
- fs/ntfs/aops.c::ntfs_writepage().
- Optimize fs/ntfs/aops.c::ntfs_write_block() by extending the page
lock protection over the buffer submission for i/o which allows the
removal of the get_bh()/put_bh() pairs for each buffer.
diff --git a/fs/ntfs/aops.c b/fs/ntfs/aops.c
--- a/fs/ntfs/aops.c
+++ b/fs/ntfs/aops.c
@@ -379,31 +379,38 @@ retry_readpage:
return 0;
}
ni = NTFS_I(page->mapping->host);
-
+ /*
+ * Only $DATA attributes can be encrypted and only unnamed $DATA
+ * attributes can be compressed. Index root can have the flags set but
+ * this means to create compressed/encrypted files, not that the
+ * attribute is compressed/encrypted.
+ */
+ if (ni->type != AT_INDEX_ROOT) {
+ /* If attribute is encrypted, deny access, just like NT4. */
+ if (NInoEncrypted(ni)) {
+ BUG_ON(ni->type != AT_DATA);
+ err = -EACCES;
+ goto err_out;
+ }
+ /* Compressed data streams are handled in compress.c. */
+ if (NInoNonResident(ni) && NInoCompressed(ni)) {
+ BUG_ON(ni->type != AT_DATA);
+ BUG_ON(ni->name_len);
+ return ntfs_read_compressed_block(page);
+ }
+ }
/* NInoNonResident() == NInoIndexAllocPresent() */
if (NInoNonResident(ni)) {
- /*
- * Only unnamed $DATA attributes can be compressed or
- * encrypted.
- */
- if (ni->type == AT_DATA && !ni->name_len) {
- /* If file is encrypted, deny access, just like NT4. */
- if (NInoEncrypted(ni)) {
- err = -EACCES;
- goto err_out;
- }
- /* Compressed data streams are handled in compress.c. */
- if (NInoCompressed(ni))
- return ntfs_read_compressed_block(page);
- }
- /* Normal data stream. */
+ /* Normal, non-resident data stream. */
return ntfs_read_block(page);
}
/*
* Attribute is resident, implying it is not compressed or encrypted.
* This also means the attribute is smaller than an mft record and
* hence smaller than a page, so can simply zero out any pages with
- * index above 0.
+ * index above 0. Note the attribute can actually be marked compressed
+ * but if it is resident the actual data is not compressed so we are
+ * ok to ignore the compressed flag here.
*/
if (unlikely(page->index > 0)) {
kaddr = kmap_atomic(page, KM_USER0);
-
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