NTFS: Add support for sparse files which have a compression unit of 0.

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

1 files changed, 45 insertions, 23 deletions

diff --git a/fs/ntfs/inode.c b/fs/ntfs/inode.c
index 55263b7de9c0..ae341922f423 100644
--- a/fs/ntfs/inode.c
+++ b/fs/ntfs/inode.c
@@ -1,7 +1,7 @@
 /**
  * inode.c - NTFS kernel inode handling. Part of the Linux-NTFS project.
  *
- * Copyright (c) 2001-2005 Anton Altaparmakov
+ * Copyright (c) 2001-2006 Anton Altaparmakov
  *
  * This program/include file is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as published
@@ -24,8 +24,10 @@
 #include <linux/smp_lock.h>
 #include <linux/quotaops.h>
 #include <linux/mount.h>
+#include <linux/mutex.h>
 
 #include "aops.h"
+#include "attrib.h"
 #include "dir.h"
 #include "debug.h"
 #include "inode.h"
@@ -1064,10 +1066,10 @@ skip_large_dir_stuff:
                 if (a->non_resident) {
                         NInoSetNonResident(ni);
                         if (NInoCompressed(ni) || NInoSparse(ni)) {
-                                if (a->data.non_resident.compression_unit !=
-                                                4) {
+                                if (NInoCompressed(ni) && a->data.non_resident.
+                                                compression_unit != 4) {
                                         ntfs_error(vi->i_sb, "Found "
-                                                        "nonstandard "
+                                                        "non-standard "
                                                         "compression unit (%u "
                                                         "instead of 4).  "
                                                         "Cannot handle this.",
@@ -1076,16 +1078,26 @@ skip_large_dir_stuff:
                                         err = -EOPNOTSUPP;
                                         goto unm_err_out;
                                 }
-                                ni->itype.compressed.block_clusters = 1U <<
-                                                a->data.non_resident.
-                                                compression_unit;
-                                ni->itype.compressed.block_size = 1U << (
-                                                a->data.non_resident.
-                                                compression_unit +
-                                                vol->cluster_size_bits);
-                                ni->itype.compressed.block_size_bits = ffs(
-                                                ni->itype.compressed.
-                                                block_size) - 1;
+                                if (a->data.non_resident.compression_unit) {
+                                        ni->itype.compressed.block_size = 1U <<
+                                                        (a->data.non_resident.
+                                                        compression_unit +
+                                                        vol->cluster_size_bits);
+                                        ni->itype.compressed.block_size_bits =
+                                                        ffs(ni->itype.
+                                                        compressed.
+                                                        block_size) - 1;
+                                        ni->itype.compressed.block_clusters =
+                                                        1U << a->data.
+                                                        non_resident.
+                                                        compression_unit;
+                                } else {
+                                        ni->itype.compressed.block_size = 0;
+                                        ni->itype.compressed.block_size_bits =
+                                                        0;
+                                        ni->itype.compressed.block_clusters =
+                                                        0;
+                                }
                                 ni->itype.compressed.size = sle64_to_cpu(
                                                 a->data.non_resident.
                                                 compressed_size);
@@ -1338,8 +1350,9 @@ static int ntfs_read_locked_attr_inode(struct inode *base_vi, struct inode *vi)
                         goto unm_err_out;
                 }
                 if (NInoCompressed(ni) || NInoSparse(ni)) {
-                        if (a->data.non_resident.compression_unit != 4) {
-                                ntfs_error(vi->i_sb, "Found nonstandard "
+                        if (NInoCompressed(ni) && a->data.non_resident.
+                                        compression_unit != 4) {
+                                ntfs_error(vi->i_sb, "Found non-standard "
                                                 "compression unit (%u instead "
                                                 "of 4).  Cannot handle this.",
                                                 a->data.non_resident.
@@ -1347,13 +1360,22 @@ static int ntfs_read_locked_attr_inode(struct inode *base_vi, struct inode *vi)
                                 err = -EOPNOTSUPP;
                                 goto unm_err_out;
                         }
-                        ni->itype.compressed.block_clusters = 1U <<
-                                        a->data.non_resident.compression_unit;
-                        ni->itype.compressed.block_size = 1U << (
-                                        a->data.non_resident.compression_unit +
-                                        vol->cluster_size_bits);
-                        ni->itype.compressed.block_size_bits = ffs(
-                                        ni->itype.compressed.block_size) - 1;
+                        if (a->data.non_resident.compression_unit) {
+                                ni->itype.compressed.block_size = 1U <<
+                                                (a->data.non_resident.
+                                                compression_unit +
+                                                vol->cluster_size_bits);
+                                ni->itype.compressed.block_size_bits =
+                                                ffs(ni->itype.compressed.
+                                                block_size) - 1;
+                                ni->itype.compressed.block_clusters = 1U <<
+                                                a->data.non_resident.
+                                                compression_unit;
+                        } else {
+                                ni->itype.compressed.block_size = 0;
+                                ni->itype.compressed.block_size_bits = 0;
+                                ni->itype.compressed.block_clusters = 0;
+                        }
                         ni->itype.compressed.size = sle64_to_cpu(
                                         a->data.non_resident.compressed_size);
                 }