linux-stable.git/fs/ntfs/file.c, branch master

ntfs: fix mmap_prepare writable check for shared mappings

2026-04-22T09:33:15+00:00

Linus pointed out that checking only VMA_WRITE_BIT is incorrect.
Private writable mappings (MAP_PRIVATE) set VM_WRITE but do not
write back to the filesystem. Also, mappings that can become
writable via mprotect() (VM_MAYWRITE) must be handled.

Use vma_desc_test_all(VMA_SHARED_BIT, VMA_MAYWRITE_BIT) instead,
which matches what other filesystems do.

Suggested-by: Linus Torvalds 
Reviewed-by: Hyunchul Lee 
Signed-off-by: Namjae Jeon

ntfs: delete dead code

2026-04-18T02:33:17+00:00

We know "ret2" is zero so there is no need to check.  Delete the
if statement.

Signed-off-by: Dan Carpenter 
Reviewed-by: Hyunchul Lee 
Signed-off-by: Namjae Jeon

ntfs: not zero out range beyond init in punch_hole

2026-04-18T02:33:00+00:00

The area beyond initialized_size are read as zero values, there is no need
to zero out that region.

Signed-off-by: Hyunchul Lee 
Signed-off-by: Namjae Jeon

ntfs: zero out stale data in straddle block beyond initialized_size

2026-04-18T02:32:56+00:00

ntfs_read_iomap_begin_non_resident() rounds up MAPPED extents
to the block boundary of initialized_size. This ensures that
any subsequent blocks are treated as IOMAP_UNWRITTEN, but
it also causes the "straddle block" containing initialized_size
to be read from disk. The disk data beyond initialized_size in
this block is stale and must be zeroed to prevent data leakage.

Signed-off-by: Hyunchul Lee 
Signed-off-by: Namjae Jeon

Merge tag 'ntfs-for-7.1-rc1-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/linkinjeon/ntfs

2026-04-17T23:35:49+00:00

Pull ntfs resurrection from Namjae Jeon:
 "Ever since Kari Argillander’s 2022 report [1] regarding the state of
  the ntfs3 driver, I have spent the last 4 years working to provide
  full write support and current trends (iomap, no buffer head, folio),
  enhanced performance, stable maintenance, utility support including
  fsck for NTFS in Linux.

  This new implementation is built upon the clean foundation of the
  original read-only NTFS driver, adding:

   - Write support:

     Implemented full write support based on the classic read-only NTFS
     driver. Added delayed allocation to improve write performance
     through multi-cluster allocation and reduced fragmentation of the
     cluster bitmap.

   - iomap conversion:

     Switched buffered IO (reads/writes), direct IO, file extent
     mapping, readpages, and writepages to use iomap.

   - Remove buffer_head:

     Completely removed buffer_head usage by converting to folios. As a
     result, the dependency on CONFIG_BUFFER_HEAD has been removed from
     Kconfig.

   - Stability improvements:

     The new ntfs driver passes 326 xfstests, compared to 273 for ntfs3.
     All tests passed by ntfs3 are a complete subset of the tests passed
     by this implementation. Added support for fallocate, idmapped
     mounts, permissions, and more.

  xfstests Results report:

     Total tests run: 787
     Passed         : 326
     Failed         : 38
     Skipped        : 423

  Failed tests breakdown:
    - 34 tests require metadata journaling
    - 4 other tests:
         094: No unwritten extent concept in NTFS on-disk format
         563: cgroup v2 aware writeback accounting not supported
         631: RENAME_WHITEOUT support required
         787: NFS delegation test"

Link: https://lore.kernel.org/all/da20d32b-5185-f40b-48b8-2986922d8b25@stargateuniverse.net/ [1]

[ Let's see if this undead filesystem ends up being of the "Easter
  miracle" kind, or the "Nosferatu of filesystems" kind... ]

* tag 'ntfs-for-7.1-rc1-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/linkinjeon/ntfs: (46 commits)
  ntfs: remove redundant out-of-bound checks
  ntfs: add bound checking to ntfs_external_attr_find
  ntfs: add bound checking to ntfs_attr_find
  ntfs: fix ignoring unreachable code warnings
  ntfs: fix inconsistent indenting warnings
  ntfs: fix variable dereferenced before check warnings
  ntfs: prefer IS_ERR_OR_NULL() over manual NULL check
  ntfs: harden ntfs_listxattr against EA entries
  ntfs: harden ntfs_ea_lookup against malformed EA entries
  ntfs: check $EA query-length in ntfs_ea_get
  ntfs: validate WSL EA payload sizes
  ntfs: fix WSL ea restore condition
  ntfs: add missing newlines to pr_err() messages
  ntfs: fix pointer/integer casting warnings
  ntfs: use ->mft_no instead of ->i_ino in prints
  ntfs: change mft_no type to u64
  ntfs: select FS_IOMAP in Kconfig
  ntfs: add MODULE_ALIAS_FS
  ntfs: reduce stack usage in ntfs_write_mft_block()
  ntfs: fix sysctl table registration and path
  ...

ntfs: use ->mft_no instead of ->i_ino in prints

2026-03-06T13:08:42+00:00

This improves log accuracy for NTFS debugging and removes unnecessary
reliance on the VFS i_ino field ahead of the core VFS type change.

Signed-off-by: Namjae Jeon

ntfs: update file operations

2026-02-19T12:50:42+00:00

Rewrite the file operations to utilize the iomap infrastructure,
replacing the legacy buffer-head based implementation.

Implement ntfs_setattr() with size change handling, uid/gid/mode.

Add support for Direct I/O.

Add support for fallocate with the FALLOC_FL_KEEP_SIZE,
FALLOC_FL_PUNCH_HOLE, FALLOC_FL_COLLAPSE_RANGE, FALLOC_FL_INSERT_RANGE
and FALLOC_FL_ALLOCATE_RANGE modes.

Implement .llseek with SEEK_DATA / SEEK_HOLE support.

Implement ntfs_fiemap() using iomap_fiemap().

Add FS_IOC_SHUTDOWN, FS_IOC_[GS]ETFSLABEL, FITRIM ioctl support.

Reviewed-by: Christoph Hellwig 
Acked-by: Christoph Hellwig 
Signed-off-by: Hyunchul Lee 
Signed-off-by: Namjae Jeon

Revert "fs: Remove NTFS classic"

2026-02-19T12:48:05+00:00

This reverts commit 7ffa8f3d30236e0ab897c30bdb01224ff1fe1c89.

Reverts the removal of the classic read-only ntfs driver to
serve as the base for a new read-write ntfs implementation.
If we stack changes on top of the revert patch, It will significantly
reduce the diff size, making the review easier.

This revert intentionally excludes the restoration of Kconfig and
Makefile. The Kconfig and Makefile will be added back in the final patch
of this series, enabling the driver only after all features and
improvements have been applied.

Acked-by: Christoph Hellwig 
Signed-off-by: Namjae Jeon

fs: Remove NTFS classic

2024-01-24T09:47:00+00:00

The replacement, NTFS3, was merged over two years ago.  It is now time to
remove the original from the tree as it is the last user of several APIs,
and it is not worth changing.

Signed-off-by: Matthew Wilcox (Oracle) 
Link: https://lore.kernel.org/r/20240115072025.2071931-1-willy@infradead.org
Acked-by: Namjae Jeon 
Acked-by: Dave Chinner 
Cc: Anton Altaparmakov 
Cc: Namjae Jeon 
Signed-off-by: Christian Brauner

buffer: remove folio_create_empty_buffers()

2023-10-25T23:47:10+00:00

With all users converted, remove the old create_empty_buffers() and rename
folio_create_empty_buffers() to create_empty_buffers().

Link: https://lkml.kernel.org/r/20231016201114.1928083-28-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) 
Cc: Andreas Gruenbacher 
Cc: Pankaj Raghav 
Cc: Ryusuke Konishi 
Signed-off-by: Andrew Morton