kernel/git/stable/linux.git/fs/ntfs/file.c, branch linux-7.2.y

ntfs: add native_symlink mount option

2026-06-15T10:39:39+00:00

Because bind-mounted subtrees of the volume may resolve to unexpected locations, change converting junctions and non-relative symbolic links into paths relative to the NTFS volume to be allowed only if the native_symlink=rel mount option is specified. Add the native_symlink= mount option to configure how absolute symbolic links and mount points (junctions) are handled. The option accepts "raw" or "rel", with "raw" being the default. Under "raw", the absolute target path (ni->target) is returned as-is without translation. Under "rel", ntfs_translate_junction() is called to rewrite the absolute path as a relative path anchored at the volume root. Signed-off-by: Hyunchul Lee Signed-off-by: Namjae Jeon

ntfs: support following Windows native symlink with absolute paths

2026-06-15T10:39:37+00:00

Extend reparse-point handling beyond relative symlinks so NTFS can expose the Windows absolute forms used by non-relative symbolic links and junctions. * Store the reparse tag and symlink flags in the inode. * Validate junction payloads, and parse targets from substitute_name. * Add function to rewrite supported Windows absolute path into Linux path relative to the mounted NTFS volume. Signed-off-by: Hyunchul Lee Signed-off-by: Namjae Jeon

ntfs: serialize volume label accesses

2026-06-05T15:20:20+00:00

Protect vol->volume_label with a mutex and snaphost the label before copy_to_user. This prevent a use-after-free when FS_IOC_SETFSLABEL replaces the vol->volume_label and FS_IOC_GETTSLABEL reads it concurrently. Cc: stable@vger.kernel.org # v7.1 Signed-off-by: Hyunchul Lee Signed-off-by: Namjae Jeon

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