kernel/linux.git/fs/ntfs3/file.c, branch linux-7.1.y

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 ...

Merge tag 'mm-stable-2026-04-13-21-45' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2026-04-15T19:59:16+00:00

Pull MM updates from Andrew Morton: - "maple_tree: Replace big node with maple copy" (Liam Howlett) Mainly prepararatory work for ongoing development but it does reduce stack usage and is an improvement. - "mm, swap: swap table phase III: remove swap_map" (Kairui Song) Offers memory savings by removing the static swap_map. It also yields some CPU savings and implements several cleanups. - "mm: memfd_luo: preserve file seals" (Pratyush Yadav) File seal preservation to LUO's memfd code - "mm: zswap: add per-memcg stat for incompressible pages" (Jiayuan Chen) Additional userspace stats reportng to zswap - "arch, mm: consolidate empty_zero_page" (Mike Rapoport) Some cleanups for our handling of ZERO_PAGE() and zero_pfn - "mm/kmemleak: Improve scan_should_stop() implementation" (Zhongqiu Han) A robustness improvement and some cleanups in the kmemleak code - "Improve khugepaged scan logic" (Vernon Yang) Improve khugepaged scan logic and reduce CPU consumption by prioritizing scanning tasks that access memory frequently - "Make KHO Stateless" (Jason Miu) Simplify Kexec Handover by transitioning KHO from an xarray-based metadata tracking system with serialization to a radix tree data structure that can be passed directly to the next kernel - "mm: vmscan: add PID and cgroup ID to vmscan tracepoints" (Thomas Ballasi and Steven Rostedt) Enhance vmscan's tracepointing - "mm: arch/shstk: Common shadow stack mapping helper and VM_NOHUGEPAGE" (Catalin Marinas) Cleanup for the shadow stack code: remove per-arch code in favour of a generic implementation - "Fix KASAN support for KHO restored vmalloc regions" (Pasha Tatashin) Fix a WARN() which can be emitted the KHO restores a vmalloc area - "mm: Remove stray references to pagevec" (Tal Zussman) Several cleanups, mainly udpating references to "struct pagevec", which became folio_batch three years ago - "mm: Eliminate fake head pages from vmemmap optimization" (Kiryl Shutsemau) Simplify the HugeTLB vmemmap optimization (HVO) by changing how tail pages encode their relationship to the head page - "mm/damon/core: improve DAMOS quota efficiency for core layer filters" (SeongJae Park) Improve two problematic behaviors of DAMOS that makes it less efficient when core layer filters are used - "mm/damon: strictly respect min_nr_regions" (SeongJae Park) Improve DAMON usability by extending the treatment of the min_nr_regions user-settable parameter - "mm/page_alloc: pcp locking cleanup" (Vlastimil Babka) The proper fix for a previously hotfixed SMP=n issue. Code simplifications and cleanups ensued - "mm: cleanups around unmapping / zapping" (David Hildenbrand) A bunch of cleanups around unmapping and zapping. Mostly simplifications, code movements, documentation and renaming of zapping functions - "support batched checking of the young flag for MGLRU" (Baolin Wang) Batched checking of the young flag for MGLRU. It's part cleanups; one benchmark shows large performance benefits for arm64 - "memcg: obj stock and slab stat caching cleanups" (Johannes Weiner) memcg cleanup and robustness improvements - "Allow order zero pages in page reporting" (Yuvraj Sakshith) Enhance free page reporting - it is presently and undesirably order-0 pages when reporting free memory. - "mm: vma flag tweaks" (Lorenzo Stoakes) Cleanup work following from the recent conversion of the VMA flags to a bitmap - "mm/damon: add optional debugging-purpose sanity checks" (SeongJae Park) Add some more developer-facing debug checks into DAMON core - "mm/damon: test and document power-of-2 min_region_sz requirement" (SeongJae Park) An additional DAMON kunit test and makes some adjustments to the addr_unit parameter handling - "mm/damon/core: make passed_sample_intervals comparisons overflow-safe" (SeongJae Park) Fix a hard-to-hit time overflow issue in DAMON core - "mm/damon: improve/fixup/update ratio calculation, test and documentation" (SeongJae Park) A batch of misc/minor improvements and fixups for DAMON - "mm: move vma_(kernel|mmu)_pagesize() out of hugetlb.c" (David Hildenbrand) Fix a possible issue with dax-device when CONFIG_HUGETLB=n. Some code movement was required. - "zram: recompression cleanups and tweaks" (Sergey Senozhatsky) A somewhat random mix of fixups, recompression cleanups and improvements in the zram code - "mm/damon: support multiple goal-based quota tuning algorithms" (SeongJae Park) Extend DAMOS quotas goal auto-tuning to support multiple tuning algorithms that users can select - "mm: thp: reduce unnecessary start_stop_khugepaged()" (Breno Leitao) Fix the khugpaged sysfs handling so we no longer spam the logs with reams of junk when starting/stopping khugepaged - "mm: improve map count checks" (Lorenzo Stoakes) Provide some cleanups and slight fixes in the mremap, mmap and vma code - "mm/damon: support addr_unit on default monitoring targets for modules" (SeongJae Park) Extend the use of DAMON core's addr_unit tunable - "mm: khugepaged cleanups and mTHP prerequisites" (Nico Pache) Cleanups to khugepaged and is a base for Nico's planned khugepaged mTHP support - "mm: memory hot(un)plug and SPARSEMEM cleanups" (David Hildenbrand) Code movement and cleanups in the memhotplug and sparsemem code - "mm: remove CONFIG_ARCH_ENABLE_MEMORY_HOTREMOVE and cleanup CONFIG_MIGRATION" (David Hildenbrand) Rationalize some memhotplug Kconfig support - "change young flag check functions to return bool" (Baolin Wang) Cleanups to change all young flag check functions to return bool - "mm/damon/sysfs: fix memory leak and NULL dereference issues" (Josh Law and SeongJae Park) Fix a few potential DAMON bugs - "mm/vma: convert vm_flags_t to vma_flags_t in vma code" (Lorenzo Stoakes) Convert a lot of the existing use of the legacy vm_flags_t data type to the new vma_flags_t type which replaces it. Mainly in the vma code. - "mm: expand mmap_prepare functionality and usage" (Lorenzo Stoakes) Expand the mmap_prepare functionality, which is intended to replace the deprecated f_op->mmap hook which has been the source of bugs and security issues for some time. Cleanups, documentation, extension of mmap_prepare into filesystem drivers - "mm/huge_memory: refactor zap_huge_pmd()" (Lorenzo Stoakes) Simplify and clean up zap_huge_pmd(). Additional cleanups around vm_normal_folio_pmd() and the softleaf functionality are performed. * tag 'mm-stable-2026-04-13-21-45' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (369 commits) mm: fix deferred split queue races during migration mm/khugepaged: fix issue with tracking lock mm/huge_memory: add and use has_deposited_pgtable() mm/huge_memory: add and use normal_or_softleaf_folio_pmd() mm: add softleaf_is_valid_pmd_entry(), pmd_to_softleaf_folio() mm/huge_memory: separate out the folio part of zap_huge_pmd() mm/huge_memory: use mm instead of tlb->mm mm/huge_memory: remove unnecessary sanity checks mm/huge_memory: deduplicate zap deposited table call mm/huge_memory: remove unnecessary VM_BUG_ON_PAGE() mm/huge_memory: add a common exit path to zap_huge_pmd() mm/huge_memory: handle buggy PMD entry in zap_huge_pmd() mm/huge_memory: have zap_huge_pmd return a boolean, add kdoc mm/huge: avoid big else branch in zap_huge_pmd() mm/huge_memory: simplify vma_is_specal_huge() mm: on remap assert that input range within the proposed VMA mm: add mmap_action_map_kernel_pages[_full]() uio: replace deprecated mmap hook with mmap_prepare in uio_info drivers: hv: vmbus: replace deprecated mmap hook with mmap_prepare mm: allow handling of stacked mmap_prepare hooks in more drivers ...

mm: reintroduce vma_desc_test() as a singular flag test

2026-04-05T20:53:19+00:00

Similar to vma_flags_test(), we have previously renamed vma_desc_test() to vma_desc_test_any(). Now that is in place, we can reintroduce vma_desc_test() to explicitly check for a single VMA flag. As with vma_flags_test(), this is useful as often flag tests are against a single flag, and vma_desc_test_any(flags, VMA_READ_BIT) reads oddly and potentially causes confusion. As with vma_flags_test() a combination of sparse and vma_flags_t being a struct means that users cannot misuse this function without it getting flagged. Also update the VMA tests to reflect this change. Link: https://lkml.kernel.org/r/3a65ca23defb05060333f0586428fe279a484564.1772704455.git.ljs@kernel.org Signed-off-by: Lorenzo Stoakes (Oracle) Acked-by: David Hildenbrand (Arm) Reviewed-by: Pedro Falcato Cc: Arnd Bergmann Cc: Babu Moger Cc: Baolin Wang Cc: Chao Yu Cc: Chatre, Reinette Cc: Chunhai Guo Cc: Damien Le Maol Cc: Dan Williams Cc: Dave Jiang Cc: Dave Martin Cc: Gao Xiang Cc: Greg Kroah-Hartman Cc: Hongbo Li Cc: Hugh Dickins Cc: James Morse Cc: Jan Kara Cc: Jann Horn Cc: Jason Gunthorpe Cc: Jeffle Xu Cc: Johannes Thumshirn Cc: Konstantin Komarov Cc: Liam Howlett Cc: "Luck, Tony" Cc: Matthew Wilcox (Oracle) Cc: Michal Hocko Cc: Mike Rapoport Cc: Muchun Song Cc: Naohiro Aota Cc: Oscar Salvador Cc: Sandeep Dhavale Cc: Suren Baghdasaryan Cc: Vishal Verma Cc: Vlastimil Babka Cc: Yue Hu Signed-off-by: Andrew Morton

mm: rename VMA flag helpers to be more readable

2026-04-05T20:53:18+00:00

Patch series "mm: vma flag tweaks". The ongoing work around introducing non-system word VMA flags has introduced a number of helper functions and macros to make life easier when working with these flags and to make conversions from the legacy use of VM_xxx flags more straightforward. This series improves these to reduce confusion as to what they do and to improve consistency and readability. Firstly the series renames vma_flags_test() to vma_flags_test_any() to make it abundantly clear that this function tests whether any of the flags are set (as opposed to vma_flags_test_all()). It then renames vma_desc_test_flags() to vma_desc_test_any() for the same reason. Note that we drop the 'flags' suffix here, as vma_desc_test_any_flags() would be cumbersome and 'test' implies a flag test. Similarly, we rename vma_test_all_flags() to vma_test_all() for consistency. Next, we have a couple of instances (erofs, zonefs) where we are now testing for vma_desc_test_any(desc, VMA_SHARED_BIT) && vma_desc_test_any(desc, VMA_MAYWRITE_BIT). This is silly, so this series introduces vma_desc_test_all() so these callers can instead invoke vma_desc_test_all(desc, VMA_SHARED_BIT, VMA_MAYWRITE_BIT). We then observe that quite a few instances of vma_flags_test_any() and vma_desc_test_any() are in fact only testing against a single flag. Using the _any() variant here is just confusing - 'any' of single item reads strangely and is liable to cause confusion. So in these instances the series reintroduces vma_flags_test() and vma_desc_test() as helpers which test against a single flag. The fact that vma_flags_t is a struct and that vma_flag_t utilises sparse to avoid confusion with vm_flags_t makes it impossible for a user to misuse these helpers without it getting flagged somewhere. The series also updates __mk_vma_flags() and functions invoked by it to explicitly mark them always inline to match expectation and to be consistent with other VMA flag helpers. It also renames vma_flag_set() to vma_flags_set_flag() (a function only used by __mk_vma_flags()) to be consistent with other VMA flag helpers. Finally it updates the VMA tests for each of these changes, and introduces explicit tests for vma_flags_test() and vma_desc_test() to assert that they behave as expected. This patch (of 6): On reflection, it's confusing to have vma_flags_test() and vma_desc_test_flags() test whether any comma-separated VMA flag bit is set, while also having vma_flags_test_all() and vma_test_all_flags() separately test whether all flags are set. Firstly, rename vma_flags_test() to vma_flags_test_any() to eliminate this confusion. Secondly, since the VMA descriptor flag functions are becoming rather cumbersome, prefer vma_desc_test*() to vma_desc_test_flags*(), and also rename vma_desc_test_flags() to vma_desc_test_any(). Finally, rename vma_test_all_flags() to vma_test_all() to keep the VMA-specific helper consistent with the VMA descriptor naming convention and to help avoid confusion vs. vma_flags_test_all(). While we're here, also update whitespace to be consistent in helper functions. Link: https://lkml.kernel.org/r/cover.1772704455.git.ljs@kernel.org Link: https://lkml.kernel.org/r/0f9cb3c511c478344fac0b3b3b0300bb95be95e9.1772704455.git.ljs@kernel.org Signed-off-by: Lorenzo Stoakes (Oracle) Suggested-by: Pedro Falcato Acked-by: David Hildenbrand (Arm) Reviewed-by: Pedro Falcato Cc: Arnd Bergmann Cc: Babu Moger Cc: Baolin Wang Cc: Chao Yu Cc: Chatre, Reinette Cc: Chunhai Guo Cc: Damien Le Maol Cc: Dan Williams Cc: Dave Jiang Cc: Dave Martin Cc: Gao Xiang Cc: Greg Kroah-Hartman Cc: Hongbo Li Cc: Hugh Dickins Cc: James Morse Cc: Jan Kara Cc: Jann Horn Cc: Jason Gunthorpe Cc: Jeffle Xu Cc: Johannes Thumshirn Cc: Konstantin Komarov Cc: Liam Howlett Cc: "Luck, Tony" Cc: Matthew Wilcox (Oracle) Cc: Michal Hocko Cc: Mike Rapoport Cc: Muchun Song Cc: Naohiro Aota Cc: Oscar Salvador Cc: Sandeep Dhavale Cc: Suren Baghdasaryan Cc: Vishal Verma Cc: Vlastimil Babka Cc: Yue Hu Signed-off-by: Andrew Morton

ntfs3: Drop pointless sync_mapping_buffers() and invalidate_inode_buffers() calls

2026-03-26T14:03:27+00:00

ntfs3 never calls mark_buffer_dirty_inode() and thus its metadata buffers list is always empty. Drop the pointless sync_mapping_buffers() and invalidate_inode_buffers() calls. CC: Konstantin Komarov CC: ntfs3@lists.linux.dev Signed-off-by: Jan Kara Link: https://patch.msgid.link/20260326095354.16340-45-jack@suse.cz Signed-off-by: Christian Brauner

treewide: Replace kmalloc with kmalloc_obj for non-scalar types

2026-02-21T09:02:28+00:00

This is the result of running the Coccinelle script from scripts/coccinelle/api/kmalloc_objs.cocci. The script is designed to avoid scalar types (which need careful case-by-case checking), and instead replace kmalloc-family calls that allocate struct or union object instances: Single allocations: kmalloc(sizeof(TYPE), ...) are replaced with: kmalloc_obj(TYPE, ...) Array allocations: kmalloc_array(COUNT, sizeof(TYPE), ...) are replaced with: kmalloc_objs(TYPE, COUNT, ...) Flex array allocations: kmalloc(struct_size(PTR, FAM, COUNT), ...) are replaced with: kmalloc_flex(*PTR, FAM, COUNT, ...) (where TYPE may also be *VAR) The resulting allocations no longer return "void *", instead returning "TYPE *". Signed-off-by: Kees Cook

ntfs3: remove legacy ntfs driver support

2026-02-19T12:50:58+00:00

Reverts the following commits that introduced legacy ntfs driver alias and related support code: 74871791ffa9 ntfs3: serve as alias for the legacy ntfs driver 1ff2e956608c fs/ntfs3: Redesign legacy ntfs support 9b872cc50daa ntfs3: add legacy ntfs file operations d55f90e9b243 ntfs3: enforce read-only when used as legacy ntfs driver The legacy ntfs driver has been remade as a new implementation, so the alias and related codes in ntfs3 are no longer needed. Acked-by: Christoph Hellwig Signed-off-by: Namjae Jeon

Merge tag 'mm-stable-2026-02-18-19-48' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2026-02-19T04:50:32+00:00

Pull more MM updates from Andrew Morton: - "mm/vmscan: fix demotion targets checks in reclaim/demotion" fixes a couple of issues in the demotion code - pages were failed demotion and were finding themselves demoted into disallowed nodes (Bing Jiao) - "Remove XA_ZERO from error recovery of dup_mmap()" fixes a rare mapledtree race and performs a number of cleanups (Liam Howlett) - "mm: add bitmap VMA flag helpers and convert all mmap_prepare to use them" implements a lot of cleanups following on from the conversion of the VMA flags into a bitmap (Lorenzo Stoakes) - "support batch checking of references and unmapping for large folios" implements batching to greatly improve the performance of reclaiming clean file-backed large folios (Baolin Wang) - "selftests/mm: add memory failure selftests" does as claimed (Miaohe Lin) * tag 'mm-stable-2026-02-18-19-48' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (36 commits) mm/page_alloc: clear page->private in free_pages_prepare() selftests/mm: add memory failure dirty pagecache test selftests/mm: add memory failure clean pagecache test selftests/mm: add memory failure anonymous page test mm: rmap: support batched unmapping for file large folios arm64: mm: implement the architecture-specific clear_flush_young_ptes() arm64: mm: support batch clearing of the young flag for large folios arm64: mm: factor out the address and ptep alignment into a new helper mm: rmap: support batched checks of the references for large folios tools/testing/vma: add VMA userland tests for VMA flag functions tools/testing/vma: separate out vma_internal.h into logical headers tools/testing/vma: separate VMA userland tests into separate files mm: make vm_area_desc utilise vma_flags_t only mm: update all remaining mmap_prepare users to use vma_flags_t mm: update shmem_[kernel]_file_*() functions to use vma_flags_t mm: update secretmem to use VMA flags on mmap_prepare mm: update hugetlbfs to use VMA flags on mmap_prepare mm: add basic VMA flag operation helper functions tools: bitmap: add missing bitmap_[subset(), andnot()] mm: add mk_vma_flags() bitmap flag macro helper ...

Merge tag 'ntfs3_for_7.0' of https://github.com/Paragon-Software-Group/linux-ntfs3

2026-02-17T23:37:06+00:00

Pull ntfs3 updates from Konstantin Komarov: "New code: - improve readahead for bitmap initialization and large directory scans - fsync files by syncing parent inodes - drop of preallocated clusters for sparse and compressed files - zero-fill folios beyond i_valid in ntfs_read_folio() - implement llseek SEEK_DATA/SEEK_HOLE by scanning data runs - implement iomap-based file operations - allow explicit boolean acl/prealloc mount options - fall-through between switch labels - delayed-allocation (delalloc) support Fixes: - check return value of indx_find to avoid infinite loop - initialize new folios before use - infinite loop in attr_load_runs_range on inconsistent metadata - infinite loop triggered by zero-sized ATTR_LIST - ntfs_mount_options leak in ntfs_fill_super() - deadlock in ni_read_folio_cmpr - circular locking dependency in run_unpack_ex - prevent infinite loops caused by the next valid being the same - restore NULL folio initialization in ntfs_writepages() - slab-out-of-bounds read in DeleteIndexEntryRoot Updates: - allow readdir() to finish after directory mutations without rewinddir() - handle attr_set_size() errors when truncating files - make ntfs_writeback_ops static - refactor duplicate kmemdup pattern in do_action() - avoid calling run_get_entry() when run == NULL in ntfs_read_run_nb_ra() Replaced: - use wait_on_buffer() directly - rename ni_readpage_cmpr into ni_read_folio_cmpr" * tag 'ntfs3_for_7.0' of https://github.com/Paragon-Software-Group/linux-ntfs3: (26 commits) fs/ntfs3: add delayed-allocation (delalloc) support fs/ntfs3: avoid calling run_get_entry() when run == NULL in ntfs_read_run_nb_ra() fs/ntfs3: add fall-through between switch labels fs/ntfs3: allow explicit boolean acl/prealloc mount options fs/ntfs3: Fix slab-out-of-bounds read in DeleteIndexEntryRoot ntfs3: Restore NULL folio initialization in ntfs_writepages() ntfs3: Refactor duplicate kmemdup pattern in do_action() fs/ntfs3: prevent infinite loops caused by the next valid being the same fs/ntfs3: make ntfs_writeback_ops static ntfs3: fix circular locking dependency in run_unpack_ex fs/ntfs3: implement iomap-based file operations fs/ntfs3: fix deadlock in ni_read_folio_cmpr fs/ntfs3: implement llseek SEEK_DATA/SEEK_HOLE by scanning data runs fs/ntfs3: zero-fill folios beyond i_valid in ntfs_read_folio() fs/ntfs3: handle attr_set_size() errors when truncating files fs/ntfs3: drop preallocated clusters for sparse and compressed files fs/ntfs3: fsync files by syncing parent inodes fs/ntfs3: fix ntfs_mount_options leak in ntfs_fill_super() fs/ntfs3: allow readdir() to finish after directory mutations without rewinddir() fs/ntfs3: improve readahead for bitmap initialization and large directory scans ...

fs/ntfs3: add delayed-allocation (delalloc) support

2026-02-16T16:23:51+00:00

This patch implements delayed allocation (delalloc) in ntfs3 driver. It introduces an in-memory delayed-runlist (run_da) and the helpers to track, reserve and later convert those delayed reservations into real clusters at writeback time. The change keeps on-disk formats untouched and focuses on pagecache integration, correctness and safe interaction with fallocate, truncate, and dio/iomap paths. Key points: - add run_da (delay-allocated run tree) and bookkeeping for delayed clusters. - mark ranges as delalloc (DELALLOC_LCN) instead of immediately allocating. Actual allocation performed later (writeback / attr_set_size_ex / explicit flush paths). - direct i/o / iomap paths updated to avoid dio collisions with delalloc: dio falls back or forces allocation of delayed blocks before proceeding. - punch/collapse/truncate/fallocate check and cancel delay-alloc reservations. Sparse/compressed files handled specially. - free-space checks updated (ntfs_check_free_space) to account for reserved delalloc clusters and MFT record budgeting. - delayed allocations are committed on last writer (file release) and on explicit allocation flush paths. Tested-by: syzbot@syzkaller.appspotmail.com Reported-by: syzbot+2bd8e813c7f767aa9bb1@syzkaller.appspotmail.com Signed-off-by: Konstantin Komarov