[Linux-NTFS-Dev] [PATCH 06/14] NTFS: Add support for sparse files which have a compression unit of
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[Linux-NTFS-Dev] [PATCH 06/14] NTFS: Add support for sparse files which have a compression unit of 0.
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From: Anton A. <ai...@ca...> - 2006-03-23 17:27:47
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NTFS: Add support for sparse files which have a compression unit of 0. Signed-off-by: Anton Altaparmakov <ai...@ca...> --- Best regards, Anton -- Anton Altaparmakov <aia21 at cam.ac.uk> (replace at with @) Unix Support, Computing Service, University of Cambridge, CB2 3QH, UK Linux NTFS maintainer / IRC: #ntfs on irc.freenode.net WWW: http://linux-ntfs.sf.net/ & http://www-stu.christs.cam.ac.uk/~aia21/ fs/ntfs/ChangeLog | 1 + fs/ntfs/attrib.c | 25 +++++++++++++------ fs/ntfs/inode.c | 68 +++++++++++++++++++++++++++++++++++------------------ fs/ntfs/layout.h | 19 +++++++++------ 4 files changed, 75 insertions(+), 38 deletions(-) a0646a1f04f1ec4c7514e5b00496b54e054a2c99 diff --git a/fs/ntfs/ChangeLog b/fs/ntfs/ChangeLog index 548d905..b577423 100644 --- a/fs/ntfs/ChangeLog +++ b/fs/ntfs/ChangeLog @@ -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. diff --git a/fs/ntfs/attrib.c b/fs/ntfs/attrib.c index a92b9e9..7a568eb 100644 --- a/fs/ntfs/attrib.c +++ b/fs/ntfs/attrib.c @@ -1695,7 +1695,9 @@ int ntfs_attr_make_non_resident(ntfs_ino 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_ino 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; diff --git a/fs/ntfs/inode.c b/fs/ntfs/inode.c index 55263b7..ae34192 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(s 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(s 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); } diff --git a/fs/ntfs/layout.h b/fs/ntfs/layout.h index bb408d4..f4283e1 100644 --- a/fs/ntfs/layout.h +++ b/fs/ntfs/layout.h @@ -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 { -- 1.2.3.g9821 |