- The Device-Mapper driver
- The Software RAID / MD driver
- Limitations when using the MD driver
-- ChangeLog
Overview
Even better is to simply use the Device-Mapper for linear raid and then you do
not have this problem with odd numbers of sectors.
-
-
-ChangeLog
-=========
-
-2.1.30:
- - Fix writev() (it kept writing the first segment over and over again
- instead of moving onto subsequent segments).
- - Fix crash in ntfs_mft_record_alloc() when mapping the new extent mft
- record failed.
-2.1.29:
- - Fix a deadlock when mounting read-write.
-2.1.28:
- - Fix a deadlock.
-2.1.27:
- - Implement page migration support so the kernel can move memory used
- by NTFS files and directories around for management purposes.
- - Add support for writing to sparse files created with Windows XP SP2.
- - Many minor improvements and bug fixes.
-2.1.26:
- - Implement support for sector sizes above 512 bytes (up to the maximum
- supported by NTFS which is 4096 bytes).
- - Enhance support for NTFS volumes which were supported by Windows but
- not by Linux due to invalid attribute list attribute flags.
- - A few minor updates and bug fixes.
-2.1.25:
- - Write support is now extended with write(2) being able to both
- overwrite existing file data and to extend files. Also, if a write
- to a sparse region occurs, write(2) will fill in the hole. Note,
- mmap(2) based writes still do not support writing into holes or
- writing beyond the initialized size.
- - Write support has a new feature and that is that truncate(2) and
- open(2) with O_TRUNC are now implemented thus files can be both made
- smaller and larger.
- - Note: Both write(2) and truncate(2)/open(2) with O_TRUNC still have
- limitations in that they
- - only provide limited support for highly fragmented files.
- - only work on regular, i.e. uncompressed and unencrypted files.
- - never create sparse files although this will change once directory
- operations are implemented.
- - Lots of bug fixes and enhancements across the board.
-2.1.24:
- - Support journals ($LogFile) which have been modified by chkdsk. This
- means users can boot into Windows after we marked the volume dirty.
- The Windows boot will run chkdsk and then reboot. The user can then
- immediately boot into Linux rather than having to do a full Windows
- boot first before rebooting into Linux and we will recognize such a
- journal and empty it as it is clean by definition.
- - Support journals ($LogFile) with only one restart page as well as
- journals with two different restart pages. We sanity check both and
- either use the only sane one or the more recent one of the two in the
- case that both are valid.
- - Lots of bug fixes and enhancements across the board.
-2.1.23:
- - Stamp the user space journal, aka transaction log, aka $UsnJrnl, if
- it is present and active thus telling Windows and applications using
- the transaction log that changes can have happened on the volume
- which are not recorded in $UsnJrnl.
- - Detect the case when Windows has been hibernated (suspended to disk)
- and if this is the case do not allow (re)mounting read-write to
- prevent data corruption when you boot back into the suspended
- Windows session.
- - Implement extension of resident files using the normal file write
- code paths, i.e. most very small files can be extended to be a little
- bit bigger but not by much.
- - Add new mount option "disable_sparse". (See list of mount options
- above for details.)
- - Improve handling of ntfs volumes with errors and strange boot sectors
- in particular.
- - Fix various bugs including a nasty deadlock that appeared in recent
- kernels (around 2.6.11-2.6.12 timeframe).
-2.1.22:
- - Improve handling of ntfs volumes with errors.
- - Fix various bugs and race conditions.
-2.1.21:
- - Fix several race conditions and various other bugs.
- - Many internal cleanups, code reorganization, optimizations, and mft
- and index record writing code rewritten to fit in with the changes.
- - Update Documentation/filesystems/ntfs.txt with instructions on how to
- use the Device-Mapper driver with NTFS ftdisk/LDM raid.
-2.1.20:
- - Fix two stupid bugs introduced in 2.1.18 release.
-2.1.19:
- - Minor bugfix in handling of the default upcase table.
- - Many internal cleanups and improvements. Many thanks to Linus
- Torvalds and Al Viro for the help and advice with the sparse
- annotations and cleanups.
-2.1.18:
- - Fix scheduling latencies at mount time. (Ingo Molnar)
- - Fix endianness bug in a little traversed portion of the attribute
- lookup code.
-2.1.17:
- - Fix bugs in mount time error code paths.
-2.1.16:
- - Implement access time updates (including mtime and ctime).
- - Implement fsync(2), fdatasync(2), and msync(2) system calls.
- - Enable the readv(2) and writev(2) system calls.
- - Enable access via the asynchronous io (aio) API by adding support for
- the aio_read(3) and aio_write(3) functions.
-2.1.15:
- - Invalidate quotas when (re)mounting read-write.
- NOTE: This now only leave user space journalling on the side. (See
- note for version 2.1.13, below.)
-2.1.14:
- - Fix an NFSd caused deadlock reported by several users.
-2.1.13:
- - Implement writing of inodes (access time updates are not implemented
- yet so mounting with -o noatime,nodiratime is enforced).
- - Enable writing out of resident files so you can now overwrite any
- uncompressed, unencrypted, nonsparse file as long as you do not
- change the file size.
- - Add housekeeping of ntfs system files so that ntfsfix no longer needs
- to be run after writing to an NTFS volume.
- NOTE: This still leaves quota tracking and user space journalling on
- the side but they should not cause data corruption. In the worst
- case the charged quotas will be out of date ($Quota) and some
- userspace applications might get confused due to the out of date
- userspace journal ($UsnJrnl).
-2.1.12:
- - Fix the second fix to the decompression engine from the 2.1.9 release
- and some further internals cleanups.
-2.1.11:
- - Driver internal cleanups.
-2.1.10:
- - Force read-only (re)mounting of volumes with unsupported volume
- flags and various cleanups.
-2.1.9:
- - Fix two bugs in handling of corner cases in the decompression engine.
-2.1.8:
- - Read the $MFT mirror and compare it to the $MFT and if the two do not
- match, force a read-only mount and do not allow read-write remounts.
- - Read and parse the $LogFile journal and if it indicates that the
- volume was not shutdown cleanly, force a read-only mount and do not
- allow read-write remounts. If the $LogFile indicates a clean
- shutdown and a read-write (re)mount is requested, empty $LogFile to
- ensure that Windows cannot cause data corruption by replaying a stale
- journal after Linux has written to the volume.
- - Improve time handling so that the NTFS time is fully preserved when
- converted to kernel time and only up to 99 nano-seconds are lost when
- kernel time is converted to NTFS time.
-2.1.7:
- - Enable NFS exporting of mounted NTFS volumes.
-2.1.6:
- - Fix minor bug in handling of compressed directories that fixes the
- erroneous "du" and "stat" output people reported.
-2.1.5:
- - Minor bug fix in attribute list attribute handling that fixes the
- I/O errors on "ls" of certain fragmented files found by at least two
- people running Windows XP.
-2.1.4:
- - Minor update allowing compilation with all gcc versions (well, the
- ones the kernel can be compiled with anyway).
-2.1.3:
- - Major bug fixes for reading files and volumes in corner cases which
- were being hit by Windows 2k/XP users.
-2.1.2:
- - Major bug fixes alleviating the hangs in statfs experienced by some
- users.
-2.1.1:
- - Update handling of compressed files so people no longer get the
- frequently reported warning messages about initialized_size !=
- data_size.
-2.1.0:
- - Add configuration option for developmental write support.
- - Initial implementation of file overwriting. (Writes to resident files
- are not written out to disk yet, so avoid writing to files smaller
- than about 1kiB.)
- - Intercept/abort changes in file size as they are not implemented yet.
-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)
-2.0.23:
- - Massive internal locking changes to mft record locking. Fixes
- various race conditions and deadlocks.
- - Fix ntfs over loopback for compressed files by adding an
- optimization barrier. (gcc was screwing up otherwise ?)
- Thanks go to Christoph Hellwig for pointing these two out:
- - Remove now unused function fs/ntfs/malloc.h::vmalloc_nofs().
- - Fix ntfs_free() for ia64 and parisc.
-2.0.22:
- - Small internal cleanups.
-2.0.21:
- These only affect 32-bit architectures:
- - Check for, and refuse to mount too large volumes (maximum is 2TiB).
- - Check for, and refuse to open too large files and directories
- (maximum is 16TiB).
-2.0.20:
- - Support non-resident directory index bitmaps. This means we now cope
- with huge directories without problems.
- - Fix a page leak that manifested itself in some cases when reading
- directory contents.
- - Internal cleanups.
-2.0.19:
- - Fix race condition and improvements in block i/o interface.
- - Optimization when reading compressed files.
-2.0.18:
- - Fix race condition in reading of compressed files.
-2.0.17:
- - Cleanups and optimizations.
-2.0.16:
- - Fix stupid bug introduced in 2.0.15 in new attribute inode API.
- - Big internal cleanup replacing the mftbmp access hacks by using the
- new attribute inode API instead.
-2.0.15:
- - Bug fix in parsing of remount options.
- - Internal changes implementing attribute (fake) inodes allowing all
- attribute i/o to go via the page cache and to use all the normal
- vfs/mm functionality.
-2.0.14:
- - Internal changes improving run list merging code and minor locking
- change to not rely on BKL in ntfs_statfs().
-2.0.13:
- - Internal changes towards using iget5_locked() in preparation for
- fake inodes and small cleanups to ntfs_volume structure.
-2.0.12:
- - Internal cleanups in address space operations made possible by the
- changes introduced in the previous release.
-2.0.11:
- - Internal updates and cleanups introducing the first step towards
- fake inode based attribute i/o.
-2.0.10:
- - Microsoft says that the maximum number of inodes is 2^32 - 1. Update
- the driver accordingly to only use 32-bits to store inode numbers on
- 32-bit architectures. This improves the speed of the driver a little.
-2.0.9:
- - Change decompression engine to use a single buffer. This should not
- affect performance except perhaps on the most heavy i/o on SMP
- systems when accessing multiple compressed files from multiple
- devices simultaneously.
- - Minor updates and cleanups.
-2.0.8:
- - Remove now obsolete show_inodes and posix mount option(s).
- - Restore show_sys_files mount option.
- - Add new mount option case_sensitive, to determine if the driver
- treats file names as case sensitive or not.
- - Mostly drop support for short file names (for backwards compatibility
- we only support accessing files via their short file name if one
- exists).
- - Fix dcache aliasing issues wrt short/long file names.
- - Cleanups and minor fixes.
-2.0.7:
- - Just cleanups.
-2.0.6:
- - Major bugfix to make compatible with other kernel changes. This fixes
- the hangs/oopses on umount.
- - Locking cleanup in directory operations (remove BKL usage).
-2.0.5:
- - Major buffer overflow bug fix.
- - Minor cleanups and updates for kernel 2.5.12.
-2.0.4:
- - Cleanups and updates for kernel 2.5.11.
-2.0.3:
- - Small bug fixes, cleanups, and performance improvements.
-2.0.2:
- - Use default fmask of 0177 so that files are no executable by default.
- If you want owner executable files, just use fmask=0077.
- - Update for kernel 2.5.9 but preserve backwards compatibility with
- kernel 2.5.7.
- - Minor bug fixes, cleanups, and updates.
-2.0.1:
- - Minor updates, primarily set the executable bit by default on files
- so they can be executed.
-2.0.0:
- - Started ChangeLog.
-
/**
* aops.c - NTFS kernel address space operations and page cache handling.
- * Part of the Linux-NTFS project.
*
- * Copyright (c) 2001-2007 Anton Altaparmakov
+ * Copyright (c) 2001-2014 Anton Altaparmakov and Tuxera Inc.
* Copyright (c) 2002 Richard Russon
*
* This program/include file is free software; you can redistribute it and/or
#endif /* NTFS_RW */
/**
- * ntfs_aops - general address space operations for inodes and attributes
+ * ntfs_bmap - map logical file block to physical device block
+ * @mapping: address space mapping to which the block to be mapped belongs
+ * @block: logical block to map to its physical device block
+ *
+ * For regular, non-resident files (i.e. not compressed and not encrypted), map
+ * the logical @block belonging to the file described by the address space
+ * mapping @mapping to its physical device block.
+ *
+ * The size of the block is equal to the @s_blocksize field of the super block
+ * of the mounted file system which is guaranteed to be smaller than or equal
+ * to the cluster size thus the block is guaranteed to fit entirely inside the
+ * cluster which means we do not need to care how many contiguous bytes are
+ * available after the beginning of the block.
+ *
+ * Return the physical device block if the mapping succeeded or 0 if the block
+ * is sparse or there was an error.
+ *
+ * Note: This is a problem if someone tries to run bmap() on $Boot system file
+ * as that really is in block zero but there is nothing we can do. bmap() is
+ * just broken in that respect (just like it cannot distinguish sparse from
+ * not available or error).
*/
-const struct address_space_operations ntfs_aops = {
- .readpage = ntfs_readpage, /* Fill page with data. */
+static sector_t ntfs_bmap(struct address_space *mapping, sector_t block)
+{
+ s64 ofs, size;
+ loff_t i_size;
+ LCN lcn;
+ unsigned long blocksize, flags;
+ ntfs_inode *ni = NTFS_I(mapping->host);
+ ntfs_volume *vol = ni->vol;
+ unsigned delta;
+ unsigned char blocksize_bits, cluster_size_shift;
+
+ ntfs_debug("Entering for mft_no 0x%lx, logical block 0x%llx.",
+ ni->mft_no, (unsigned long long)block);
+ if (ni->type != AT_DATA || !NInoNonResident(ni) || NInoEncrypted(ni)) {
+ ntfs_error(vol->sb, "BMAP does not make sense for %s "
+ "attributes, returning 0.",
+ (ni->type != AT_DATA) ? "non-data" :
+ (!NInoNonResident(ni) ? "resident" :
+ "encrypted"));
+ return 0;
+ }
+ /* None of these can happen. */
+ BUG_ON(NInoCompressed(ni));
+ BUG_ON(NInoMstProtected(ni));
+ blocksize = vol->sb->s_blocksize;
+ blocksize_bits = vol->sb->s_blocksize_bits;
+ ofs = (s64)block << blocksize_bits;
+ read_lock_irqsave(&ni->size_lock, flags);
+ size = ni->initialized_size;
+ i_size = i_size_read(VFS_I(ni));
+ read_unlock_irqrestore(&ni->size_lock, flags);
+ /*
+ * If the offset is outside the initialized size or the block straddles
+ * the initialized size then pretend it is a hole unless the
+ * initialized size equals the file size.
+ */
+ if (unlikely(ofs >= size || (ofs + blocksize > size && size < i_size)))
+ goto hole;
+ cluster_size_shift = vol->cluster_size_bits;
+ down_read(&ni->runlist.lock);
+ lcn = ntfs_attr_vcn_to_lcn_nolock(ni, ofs >> cluster_size_shift, false);
+ up_read(&ni->runlist.lock);
+ if (unlikely(lcn < LCN_HOLE)) {
+ /*
+ * Step down to an integer to avoid gcc doing a long long
+ * comparision in the switch when we know @lcn is between
+ * LCN_HOLE and LCN_EIO (i.e. -1 to -5).
+ *
+ * Otherwise older gcc (at least on some architectures) will
+ * try to use __cmpdi2() which is of course not available in
+ * the kernel.
+ */
+ switch ((int)lcn) {
+ case LCN_ENOENT:
+ /*
+ * If the offset is out of bounds then pretend it is a
+ * hole.
+ */
+ goto hole;
+ case LCN_ENOMEM:
+ ntfs_error(vol->sb, "Not enough memory to complete "
+ "mapping for inode 0x%lx. "
+ "Returning 0.", ni->mft_no);
+ break;
+ default:
+ ntfs_error(vol->sb, "Failed to complete mapping for "
+ "inode 0x%lx. Run chkdsk. "
+ "Returning 0.", ni->mft_no);
+ break;
+ }
+ return 0;
+ }
+ if (lcn < 0) {
+ /* It is a hole. */
+hole:
+ ntfs_debug("Done (returning hole).");
+ return 0;
+ }
+ /*
+ * The block is really allocated and fullfils all our criteria.
+ * Convert the cluster to units of block size and return the result.
+ */
+ delta = ofs & vol->cluster_size_mask;
+ if (unlikely(sizeof(block) < sizeof(lcn))) {
+ block = lcn = ((lcn << cluster_size_shift) + delta) >>
+ blocksize_bits;
+ /* If the block number was truncated return 0. */
+ if (unlikely(block != lcn)) {
+ ntfs_error(vol->sb, "Physical block 0x%llx is too "
+ "large to be returned, returning 0.",
+ (long long)lcn);
+ return 0;
+ }
+ } else
+ block = ((lcn << cluster_size_shift) + delta) >>
+ blocksize_bits;
+ ntfs_debug("Done (returning block 0x%llx).", (unsigned long long)lcn);
+ return block;
+}
+
+/**
+ * ntfs_normal_aops - address space operations for normal inodes and attributes
+ *
+ * Note these are not used for compressed or mst protected inodes and
+ * attributes.
+ */
+const struct address_space_operations ntfs_normal_aops = {
+ .readpage = ntfs_readpage,
#ifdef NTFS_RW
- .writepage = ntfs_writepage, /* Write dirty page to disk. */
+ .writepage = ntfs_writepage,
+ .set_page_dirty = __set_page_dirty_buffers,
+#endif /* NTFS_RW */
+ .bmap = ntfs_bmap,
+ .migratepage = buffer_migrate_page,
+ .is_partially_uptodate = block_is_partially_uptodate,
+ .error_remove_page = generic_error_remove_page,
+};
+
+/**
+ * ntfs_compressed_aops - address space operations for compressed inodes
+ */
+const struct address_space_operations ntfs_compressed_aops = {
+ .readpage = ntfs_readpage,
+#ifdef NTFS_RW
+ .writepage = ntfs_writepage,
+ .set_page_dirty = __set_page_dirty_buffers,
#endif /* NTFS_RW */
- .migratepage = buffer_migrate_page, /* Move a page cache page from
- one physical page to an
- other. */
+ .migratepage = buffer_migrate_page,
+ .is_partially_uptodate = block_is_partially_uptodate,
.error_remove_page = generic_error_remove_page,
};
without touching the buffers
belonging to the page. */
#endif /* NTFS_RW */
- .migratepage = buffer_migrate_page, /* Move a page cache page from
- one physical page to an
- other. */
+ .migratepage = buffer_migrate_page,
+ .is_partially_uptodate = block_is_partially_uptodate,
.error_remove_page = generic_error_remove_page,
};
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