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

Signed-off-by: Anton Altaparmakov <aia21@cantab.net>
This commit is contained in:
Anton Altaparmakov 2006-03-23 15:53:03 +00:00
parent 949763b2b8
commit a0646a1f04
4 changed files with 75 additions and 38 deletions
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1
fs/ntfs/ChangeLog
View File

@ -31,6 +31,7 @@ ToDo/Notes:
- Fix comparison of $MFT and $MFTMirr to not bail out when there are
unused, invalid mft records which are the same in both $MFT and
$MFTMirr.
- Add support for sparse files which have a compression unit of 0.
2.1.26 - Minor bug fixes and updates.

25
fs/ntfs/attrib.c
View File

@ -1695,7 +1695,9 @@ int ntfs_attr_make_non_resident(ntfs_inode *ni, const u32 data_size)
a->data.non_resident.initialized_size =
cpu_to_sle64(attr_size);
if (NInoSparse(ni) || NInoCompressed(ni)) {
a->data.non_resident.compression_unit = 4;
a->data.non_resident.compression_unit = 0;
if (NInoCompressed(ni) || vol->major_ver < 3)
a->data.non_resident.compression_unit = 4;
a->data.non_resident.compressed_size =
a->data.non_resident.allocated_size;
} else
@ -1714,13 +1716,20 @@ int ntfs_attr_make_non_resident(ntfs_inode *ni, const u32 data_size)
ni->allocated_size = new_size;
if (NInoSparse(ni) || NInoCompressed(ni)) {
ni->itype.compressed.size = ni->allocated_size;
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;
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;
}
vi->i_blocks = ni->itype.compressed.size >> 9;
} else
vi->i_blocks = ni->allocated_size >> 9;

68
fs/ntfs/inode.c
View File

@ -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);
}

19
fs/ntfs/layout.h
View File

@ -769,7 +769,7 @@ typedef struct {
compressed. (This effectively limits the
compression unit size to be a power of two
clusters.) WinNT4 only uses a value of 4.
Sparse files also have this set to 4. */
Sparse files have this set to 0 on XPSP2. */
/* 35*/ u8 reserved[5]; /* Align to 8-byte boundary. */
/* The sizes below are only used when lowest_vcn is zero, as otherwise it would
be difficult to keep them up-to-date.*/
@ -1076,16 +1076,21 @@ typedef struct {
/* 20*/ sle64 last_access_time; /* Time this mft record was last
accessed. */
/* 28*/ sle64 allocated_size; /* Byte size of on-disk allocated space
for the data attribute. So for
normal $DATA, this is the
for the unnamed data attribute. So
for normal $DATA, this is the
allocated_size from the unnamed
$DATA attribute and for compressed
and/or sparse $DATA, this is the
compressed_size from the unnamed
$DATA attribute. NOTE: This is a
multiple of the cluster size. */
/* 30*/ sle64 data_size; /* Byte size of actual data in data
attribute. */
$DATA attribute. For a directory or
other inode without an unnamed $DATA
attribute, this is always 0. NOTE:
This is a multiple of the cluster
size. */
/* 30*/ sle64 data_size; /* Byte size of actual data in unnamed
data attribute. For a directory or
other inode without an unnamed $DATA
attribute, this is always 0. */
/* 38*/ FILE_ATTR_FLAGS file_attributes; /* Flags describing the file. */
/* 3c*/ union {
/* 3c*/ struct {