NTFS: 2.0.25 - Small bug fixes and cleanups.

- Unlock the page in an out of memory error code path in
  fs/ntfs/aops.c::ntfs_read_block().
- If fs/ntfs/aops.c::ntfs_read_page() is called on an uptodate page,
  just unlock the page and return. (This can happen due to ->writepage
  clearing PageUptodate() during write out of MstProtected()
  attributes.
- Remove leaked write code again.

Documentation/filesystems/ntfs.txt

@@ -247,6 +247,8 @@ ChangeLog
 
 Note, a technical ChangeLog aimed at kernel hackers is in fs/ntfs/ChangeLog.
 
+2.0.25:
+	- Minor bugfixes in error code paths and small cleanups.
 2.0.24:
 	- Small internal cleanups.
 	- Support for sendfile system call. (Christoph Hellwig)

fs/ntfs/ChangeLog

@@ -2,6 +2,16 @@ ToDo:
 	- Find and fix bugs.
 	- Enable NFS exporting of NTFS.
 
+2.0.25 - Small bug fixes and cleanups.
+
+	- Unlock the page in an out of memory error code path in
+	  fs/ntfs/aops.c::ntfs_read_block().
+	- If fs/ntfs/aops.c::ntfs_read_page() is called on an uptodate page,
+	  just unlock the page and return. (This can happen due to ->writepage
+	  clearing PageUptodate() during write out of MstProtected()
+	  attributes.
+	- Remove leaked write code again.
+
 2.0.24 - Cleanups.
 
 	- Treat BUG_ON() as ASSERT() not VERIFY(), i.e. do not use side effects

fs/ntfs/Makefile

@@ -5,7 +5,7 @@ obj-$(CONFIG_NTFS_FS) += ntfs.o
 ntfs-objs := aops.o attrib.o compress.o debug.o dir.o file.o inode.o mft.o \
 	     mst.o namei.o super.o sysctl.o time.o unistr.o upcase.o
 
-EXTRA_CFLAGS = -DNTFS_VERSION=\"2.0.24\"
+EXTRA_CFLAGS = -DNTFS_VERSION=\"2.0.25\"
 
 ifeq ($(CONFIG_NTFS_DEBUG),y)
 EXTRA_CFLAGS += -DDEBUG

fs/ntfs/aops.c

@@ -156,6 +156,9 @@ static void ntfs_end_buffer_async_read(struct buffer_head *bh, int uptodate)
  * applies the mst fixups to the page before finally marking it uptodate and
  * unlocking it.
  *
+ * We only enforce allocated_size limit because i_size is checked for in
+ * generic_file_read().
+ *
  * Return 0 on success and -errno on error.
  *
  * Contains an adapted version of fs/buffer.c::block_read_full_page().
@@ -182,8 +185,10 @@ static int ntfs_read_block(struct page *page)
 	if (!page_has_buffers(page))
 		create_empty_buffers(page, blocksize, 0);
 	bh = head = page_buffers(page);
-	if (unlikely(!bh))
+	if (unlikely(!bh)) {
+		unlock_page(page);
 		return -ENOMEM;
+	}
 
 	iblock = page->index << (PAGE_CACHE_SHIFT - blocksize_bits);
 	lblock = (ni->allocated_size + blocksize - 1) >> blocksize_bits;
@@ -343,8 +348,16 @@ int ntfs_readpage(struct file *file, struct page *page)
 	u32 attr_len;
 	int err = 0;
 
-	if (unlikely(!PageLocked(page)))
-		PAGE_BUG(page);
+	BUG_ON(!PageLocked(page));
+
+	/*
+	 * This can potentially happen because we clear PageUptodate() during
+	 * ntfs_writepage() of MstProtected() attributes.
+	 */
+	if (PageUptodate(page)) {
+		unlock_page(page);
+		return 0;
+	}
 
 	ni = NTFS_I(page->mapping->host);
 

fs/ntfs/file.c

@@ -51,9 +51,6 @@ static int ntfs_file_open(struct inode *vi, struct file *filp)
 struct file_operations ntfs_file_ops = {
 	.llseek		= generic_file_llseek,	/* Seek inside file. */
 	.read		= generic_file_read,	/* Read from file. */
-#ifdef NTFS_RW
-	.write		= generic_file_write,	/* Write to a file. */
-#endif
 	.mmap		= generic_file_mmap,	/* Mmap file. */
 	.sendfile	= generic_file_sendfile,/* Zero-copy data send with the
 						   data source being on the