NTFS: - In fs/ntfs/compress.c, use i_size_read() at the start and then use the

	cached value everywhere.  Cache the initialized_size in the same way
	and protect the critical region where the two sizes are read using the
	new size_lock of the ntfs inode.
      - Add the new size_lock to the ntfs_inode structure (fs/ntfs/inode.h)
	and initialize it (fs/ntfs/inode.c).

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

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/ntfs/inode.h b/fs/ntfs/inode.h
index 99580455f2ed..56b2d6ec33f7 100644
--- a/fs/ntfs/inode.h
+++ b/fs/ntfs/inode.h
@@ -44,6 +44,7 @@ typedef struct _ntfs_inode ntfs_inode;
  * fields already provided in the VFS inode.
  */
 struct _ntfs_inode {
+        rwlock_t size_lock;     /* Lock serializing access to inode sizes. */
         s64 initialized_size;   /* Copy from the attribute record. */
         s64 allocated_size;     /* Copy from the attribute record. */
         unsigned long state;    /* NTFS specific flags describing this inode.