André Almeida 58e55efd6c tmpfs: Add casefold lookup support ... Enable casefold lookup in tmpfs, based on the encoding defined by userspace. That means that instead of comparing byte per byte a file name, it compares to a case-insensitive equivalent of the Unicode string. * Dcache handling There's a special need when dealing with case-insensitive dentries. First of all, we currently invalidated every negative casefold dentries. That happens because currently VFS code has no proper support to deal with that, giving that it could incorrectly reuse a previous filename for a new file that has a casefold match. For instance, this could happen: $ mkdir DIR $ rm -r DIR $ mkdir dir $ ls DIR/ And would be perceived as inconsistency from userspace point of view, because even that we match files in a case-insensitive manner, we still honor whatever is the initial filename. Along with that, tmpfs stores only the first equivalent name dentry used in the dcache, preventing duplications of dentries in the dcache. The d_compare() version for casefold files uses a normalized string, so the filename under lookup will be compared to another normalized string for the existing file, achieving a casefolded lookup. * Enabling casefold via mount options Most filesystems have their data stored in disk, so casefold option need to be enabled when building a filesystem on a device (via mkfs). However, as tmpfs is a RAM backed filesystem, there's no disk information and thus no mkfs to store information about casefold. For tmpfs, create casefold options for mounting. Userspace can then enable casefold support for a mount point using: $ mount -t tmpfs -o casefold=utf8-12.1.0 fs_name mount_dir/ Userspace must set what Unicode standard is aiming to. The available options depends on what the kernel Unicode subsystem supports. And for strict encoding: $ mount -t tmpfs -o casefold=utf8-12.1.0,strict_encoding fs_name mount_dir/ Strict encoding means that tmpfs will refuse to create invalid UTF-8 sequences. When this option is not enabled, any invalid sequence will be treated as an opaque byte sequence, ignoring the encoding thus not being able to be looked up in a case-insensitive way. * Check for casefold dirs on simple_lookup() On simple_lookup(), do not create dentries for casefold directories. Currently, VFS does not support case-insensitive negative dentries and can create inconsistencies in the filesystem. Prevent such dentries to being created in the first place. Reviewed-by: Gabriel Krisman Bertazi <gabriel@krisman.be> Reviewed-by: Gabriel Krisman Bertazi <krisman@suse.de> Signed-off-by: André Almeida <andrealmeid@igalia.com> Link: https://lore.kernel.org/r/20241021-tonyk-tmpfs-v8-6-f443d5814194@igalia.com Signed-off-by: Christian Brauner <brauner@kernel.org>		2024-10-28 13:36:55 +01:00
..
damon	mm/damon/tests/sysfs-kunit.h: fix memory leak in damon_sysfs_test_add_targets()	2024-10-17 00:28:08 -07:00
kasan	Rust changes for v6.12	2024-09-25 10:25:40 -07:00
kfence	mm: kfence: fix elapsed time for allocated/freed track	2024-09-26 14:01:44 -07:00
kmsan	kmsan: do not pass NULL pointers as 0	2024-07-03 19:30:26 -07:00
backing-dev.c	writeback: support retrieving per group debug writeback stats of bdi	2024-05-05 17:53:51 -07:00
balloon_compaction.c	mm: remove MIGRATE_SYNC_NO_COPY mode	2024-07-03 19:30:00 -07:00
bootmem_info.c	bootmem: use kmemleak_free_part_phys in put_page_bootmem	2023-10-25 16:47:13 -07:00
cma_debug.c	mm/cma_debug: show complete cma name in debugfs directories	2022-09-11 20:25:50 -07:00
cma_sysfs.c	mm/cma: add sysfs file 'release_pages_success'	2024-02-22 10:24:57 -08:00
cma.c	mm/cma: add cma_{alloc,free}_folio()	2024-09-03 21:15:36 -07:00
cma.h	mm/cma: add sysfs file 'release_pages_success'	2024-02-22 10:24:57 -08:00
compaction.c	mm:page_alloc: fix the NULL ac->nodemask in __alloc_pages_slowpath()	2024-09-03 21:15:47 -07:00
debug_page_alloc.c	mm: page_alloc: consolidate free page accounting	2024-04-25 20:56:04 -07:00
debug_page_ref.c
debug_vm_pgtable.c	mm/debug_vm_pgtable: Use pxdp_get() for accessing page table entries	2024-09-17 01:07:01 -07:00
debug.c	mm: support only one page_type per page	2024-09-03 21:15:43 -07:00
dmapool_test.c	mm/dmapool: add MODULE_DESCRIPTION()	2024-07-03 19:29:58 -07:00
dmapool.c	mm/mempool/dmapool: remove CONFIG_DEBUG_SLAB ifdefs	2023-12-05 11:17:58 +01:00
early_ioremap.c	mm/early_ioremap.c: improve the execution efficiency of early_ioremap_setup()	2023-06-09 16:25:56 -07:00
execmem.c	mm/execmem, arch: convert remaining overrides of module_alloc to execmem	2024-05-14 00:31:43 -07:00
fadvise.c	introduce fd_file(), convert all accessors to it.	2024-08-12 22:00:43 -04:00
fail_page_alloc.c	fault-inject: improve build for CONFIG_FAULT_INJECTION=n	2024-09-01 20:43:33 -07:00
failslab.c	fault-inject: improve build for CONFIG_FAULT_INJECTION=n	2024-09-01 20:43:33 -07:00
filemap.c	mm/filemap: fix filemap_get_folios_contig THP panic	2024-09-26 14:01:43 -07:00
folio-compat.c	mm: remove putback_lru_page()	2024-09-09 16:38:59 -07:00
gup_test.c	Merge mm-hotfixes-stable into mm-stable to pick up depended-upon changes.	2023-06-23 16:58:19 -07:00
gup_test.h	mm/gup_test: start/stop/read functionality for PIN LONGTERM test	2022-11-08 17:37:15 -08:00
gup.c	mm/hugetlb: simplify refs in memfd_alloc_folio	2024-09-26 14:01:44 -07:00
highmem.c	mm/highmem: make nr_free_highpages() return "unsigned long"	2024-07-03 19:30:06 -07:00
hmm.c	mm: provide mm_struct and address to huge_ptep_get()	2024-07-12 15:52:15 -07:00
huge_memory.c	mm: huge_memory: add vma_thp_disabled() and thp_disabled_by_hw()	2024-10-17 00:28:10 -07:00
hugetlb_cgroup.c	mm: memcg: don't call propagate_protected_usage() needlessly	2024-09-01 20:25:50 -07:00
hugetlb_vmemmap.c	mm/hugetlb_vmemmap: don't synchronize_rcu() without HVO	2024-09-01 20:25:45 -07:00
hugetlb_vmemmap.h	mm: hugetlb_vmemmap: fix reference to nonexistent file	2023-10-25 16:47:14 -07:00
hugetlb.c	mm/hugetlb: fix memfd_pin_folios resv_huge_pages leak	2024-09-26 14:01:43 -07:00
hwpoison-inject.c	mm/hwpoison: add MODULE_DESCRIPTION()	2024-07-03 19:29:58 -07:00
init-mm.c	mm: Deprecate pasid field	2023-12-12 10:11:32 +01:00
internal.h	ALong with the usual shower of singleton patches, notable patch series in	2024-09-21 07:29:05 -07:00
interval_tree.c
io-mapping.c
ioremap.c	mm: ioremap: remove unneeded ioremap_allowed and iounmap_allowed	2023-08-18 10:12:36 -07:00
Kconfig	mm: make SPLIT_PTE_PTLOCKS depend on SMP	2024-09-26 14:01:43 -07:00
Kconfig.debug	slub: Introduce CONFIG_SLUB_RCU_DEBUG	2024-08-27 14:12:51 +02:00
khugepaged.c	mm: khugepaged: fix the incorrect statistics when collapsing large file folios	2024-10-17 00:28:10 -07:00
kmemleak.c	mm/kmemleak: use IS_ERR_PCPU() for pointer in the percpu address space	2024-09-03 21:15:38 -07:00
ksm.c	mm: remove PageSwapCache	2024-09-03 21:15:44 -07:00
list_lru.c	mm: list_lru: fix UAF for memory cgroup	2024-08-07 18:33:56 -07:00
maccess.c	mm: Fix copy_from_user_nofault().	2023-04-12 17:36:23 -07:00
madvise.c	ALong with the usual shower of singleton patches, notable patch series in	2024-09-21 07:29:05 -07:00
Makefile	mm: introduce numa_emulation	2024-09-03 21:15:31 -07:00
mapping_dirty_helpers.c	mm: fix clean_record_shared_mapping_range kernel-doc	2023-08-24 16:20:30 -07:00
memblock.c	memblock: updates for 6.12-rc1	2024-09-25 11:35:19 -07:00
memcontrol-v1.c	struct fd layout change (and conversion to accessor helpers)	2024-09-23 09:35:36 -07:00
memcontrol-v1.h	memcg: cleanup with !CONFIG_MEMCG_V1	2024-09-17 01:07:00 -07:00
memcontrol.c	ALong with the usual shower of singleton patches, notable patch series in	2024-09-21 07:29:05 -07:00
memfd.c	mm/hugetlb: simplify refs in memfd_alloc_folio	2024-09-26 14:01:44 -07:00
memory_hotplug.c	ALong with the usual shower of singleton patches, notable patch series in	2024-09-21 07:29:05 -07:00
memory-failure.c	mm: migrate: add isolate_folio_to_list()	2024-09-03 21:15:59 -07:00
memory-tiers.c	memory tiers: use default_dram_perf_ref_source in log message	2024-09-26 14:01:44 -07:00
memory.c	mm: fix follow_pfnmap API lockdep assert	2024-10-18 09:50:05 -07:00
mempolicy.c	mm,memcg: provide per-cgroup counters for NUMA balancing operations	2024-09-03 21:15:36 -07:00
mempool.c	mm: fix xyz_noprof functions calling profiled functions	2024-06-05 19:19:26 -07:00
memremap.c	mm: convert put_devmap_managed_page_refs() to put_devmap_managed_folio_refs()	2024-05-05 17:53:49 -07:00
memtest.c	memtest: use {READ,WRITE}_ONCE in memory scanning	2024-03-13 12:12:21 -07:00
migrate_device.c	mm: remap unused subpages to shared zeropage when splitting isolated thp	2024-09-09 16:39:03 -07:00
migrate.c	mm: migrate: annotate data-race in migrate_folio_unmap()	2024-09-26 14:01:44 -07:00
mincore.c	mm: provide mm_struct and address to huge_ptep_get()	2024-07-12 15:52:15 -07:00
mlock.c	Random number generator updates for Linux 6.11-rc1.	2024-07-24 10:29:50 -07:00
mm_init.c	mm: drop CONFIG_HAVE_ARCH_NODEDATA_EXTENSION	2024-09-03 21:15:28 -07:00
mm_slot.h	mm: introduce common struct mm_slot	2022-10-03 14:02:43 -07:00
mmap_lock.c	mm: mmap_lock: replace get_memcg_path_buf() with on-stack buffer	2024-07-03 19:30:26 -07:00
mmap.c	mm/mmap: correct error handling in mmap_region()	2024-10-17 00:28:05 -07:00
mmu_gather.c	mm/mmu_gather: improve cond_resched() handling with large folios and expensive page freeing	2024-02-22 15:27:17 -08:00
mmu_notifier.c	mm: move internal core VMA manipulation functions to own file	2024-09-01 20:25:54 -07:00
mmzone.c	mm: improve code consistency with zonelist_* helper functions	2024-09-01 20:25:55 -07:00
mprotect.c	mm/mprotect: replace can_modify_mm with can_modify_vma	2024-09-03 21:15:41 -07:00
mremap.c	mm/mremap: fix move_normal_pmd/retract_page_tables race	2024-10-17 00:28:07 -07:00
mseal.c	ALong with the usual shower of singleton patches, notable patch series in	2024-09-21 07:29:05 -07:00
msync.c	mm/msync: use vma_find() instead of vma linked list	2022-09-26 19:46:25 -07:00
nommu.c	mm: remove follow_page()	2024-09-01 20:26:01 -07:00
numa_emulation.c	mm: introduce numa_emulation	2024-09-03 21:15:31 -07:00
numa_memblks.c	mm: make range-to-target_node lookup facility a part of numa_memblks	2024-09-03 21:15:32 -07:00
numa.c	mm: make range-to-target_node lookup facility a part of numa_memblks	2024-09-03 21:15:32 -07:00
oom_kill.c	memory: remove the now superfluous sentinel element from ctl_table array	2024-04-25 20:56:32 -07:00
page_alloc.c	ALong with the usual shower of singleton patches, notable patch series in	2024-09-21 07:29:05 -07:00
page_counter.c	mm, memcg: cg2 memory{.swap,}.peak write handlers	2024-09-01 20:25:53 -07:00
page_ext.c	mm: don't account memmap per-node	2024-08-15 22:16:14 -07:00
page_idle.c	mm: page_idle: convert page idle to use a folio	2023-01-18 17:12:52 -08:00
page_io.c	mm: fix swap_read_folio_zeromap() for large folios with partial zeromap	2024-09-17 01:07:01 -07:00
page_isolation.c	mm: remove migration for HugePage in isolate_single_pageblock()	2024-09-03 21:15:40 -07:00
page_owner.c	mm/page-owner: use gfp_nested_mask() instead of open coded masking	2024-05-19 14:40:44 -07:00
page_poison.c	mm/page_poison: replace kmap_atomic() with kmap_local_page()	2023-12-10 16:51:50 -08:00
page_reporting.c	mm, treewide: rename MAX_ORDER to MAX_PAGE_ORDER	2024-01-08 15:27:15 -08:00
page_reporting.h
page_table_check.c	mm/page_table_check: fix crash on ZONE_DEVICE	2024-06-15 10:43:04 -07:00
page_vma_mapped.c	mm: make page_mapped_in_vma conditional on CONFIG_MEMORY_FAILURE	2024-05-05 17:53:45 -07:00
page-writeback.c	ALong with the usual shower of singleton patches, notable patch series in	2024-09-21 07:29:05 -07:00
pagewalk.c	mm/pagewalk: check pfnmap for folio_walk_start()	2024-09-17 01:06:58 -07:00
percpu-internal.h	mm: remove CONFIG_MEMCG_KMEM	2024-07-10 12:14:54 -07:00
percpu-km.c	percpu: flush tlb in pcpu_reclaim_populated()	2021-07-04 18:30:17 +00:00
percpu-stats.c	mm: use vmalloc_array and vcalloc for array allocations	2022-03-08 09:30:46 -05:00
percpu-vm.c	percpu: clean up all mappings when pcpu_map_pages() fails	2024-04-25 20:55:49 -07:00
percpu.c	percpu: remove pcpu_alloc_size()	2024-09-01 20:26:04 -07:00
pgalloc-track.h
pgtable-generic.c	mm: fix race between __split_huge_pmd_locked() and GUP-fast	2024-05-07 10:37:00 -07:00
process_vm_access.c	mm: fix process_vm_rw page counts	2023-12-10 16:51:39 -08:00
ptdump.c	mm: ptdump: add check_wx_pages debugfs attribute	2024-02-22 10:24:47 -08:00
readahead.c	struct fd layout change (and conversion to accessor helpers)	2024-09-23 09:35:36 -07:00
rmap.c	mm: introduce a pageflag for partially mapped folios	2024-09-09 16:39:04 -07:00
rodata_test.c	mm/rodata_test: use PAGE_ALIGNED() helper	2022-10-03 14:03:05 -07:00
secretmem.c	secretmem: disable memfd_secret() if arch cannot set direct map	2024-10-09 12:47:19 -07:00
shmem_quota.c	shmem_quota: build the object file conditionally to the config option	2024-09-01 20:25:45 -07:00
shmem.c	tmpfs: Add casefold lookup support	2024-10-28 13:36:55 +01:00
show_mem.c	mm/show_mem.c: report alloc tags in human readable units	2024-09-17 01:07:00 -07:00
shrinker_debug.c	mm: shrinker: use min() to improve shrinker_debugfs_scan_write()	2024-09-03 21:15:40 -07:00
shrinker.c	mm: shrinker: use kvzalloc_node() from expand_one_shrinker_info()	2024-01-05 09:58:32 -08:00
shuffle.c	mm/shuffle: convert module_param_call to module_param_cb	2022-10-03 14:03:07 -07:00
shuffle.h	mm, treewide: rename MAX_ORDER to MAX_PAGE_ORDER	2024-01-08 15:27:15 -08:00
slab_common.c	mm, slab: suppress warnings in test_leak_destroy kunit test	2024-10-02 16:28:46 +02:00
slab.h	mm, slab: suppress warnings in test_leak_destroy kunit test	2024-10-02 16:28:46 +02:00
slub.c	mm, slab: suppress warnings in test_leak_destroy kunit test	2024-10-02 16:28:46 +02:00
sparse-vmemmap.c	mm: don't account memmap per-node	2024-08-15 22:16:14 -07:00
sparse.c	A set of X86 fixes:	2024-09-01 14:43:08 -07:00
swap_cgroup.c	mm: attempt to batch free swap entries for zap_pte_range()	2024-09-03 21:15:33 -07:00
swap_slots.c	mm: swap: update get_swap_pages() to take folio order	2024-04-25 20:56:37 -07:00
swap_state.c	mm: add nr argument in mem_cgroup_swapin_uncharge_swap() helper to support large folios	2024-09-17 01:07:01 -07:00
swap.c	mm: remove isolate_lru_page()	2024-09-09 16:38:59 -07:00
swap.h	mm: fix swap_read_folio_zeromap() for large folios with partial zeromap	2024-09-17 01:07:01 -07:00
swapfile.c	mm/swapfile: skip HugeTLB pages for unuse_vma	2024-10-17 00:28:11 -07:00
truncate.c	mm: Fix missing folio invalidation calls during truncation	2024-08-24 16:09:16 +02:00
usercopy.c	mm: Fix copy_from_user_nofault().	2023-04-12 17:36:23 -07:00
userfaultfd.c	ALong with the usual shower of singleton patches, notable patch series in	2024-09-21 07:29:05 -07:00
util.c	mm: only enforce minimum stack gap size if it's sensible	2024-09-01 20:26:02 -07:00
vma_internal.h	mm: remove duplicated include in vma_internal.h	2024-09-01 20:26:02 -07:00
vma.c	mm/vma: return the exact errno in vms_gather_munmap_vmas()	2024-09-17 01:07:00 -07:00
vma.h	mm: make vma_prepare() and friends static and internal to vma.c	2024-09-03 21:15:54 -07:00
vmalloc.c	ALong with the usual shower of singleton patches, notable patch series in	2024-09-21 07:29:05 -07:00
vmpressure.c	eventfd: simplify eventfd_signal()	2023-11-28 14:08:38 +01:00
vmscan.c	mm/mglru: only clear kswapd_failures if reclaimable	2024-10-17 00:28:12 -07:00
vmstat.c	mm: split underused THPs	2024-09-09 16:39:04 -07:00
workingset.c	cachestat: do not flush stats in recency check	2024-07-03 22:40:37 -07:00
z3fold.c	mm/z3fold: add __percpu annotation to *unbuddied pointer in struct z3fold_pool	2024-09-01 20:25:56 -07:00
zbud.c	mm: zpool: return pool size in pages	2024-04-25 20:55:48 -07:00
zpool.c	mm: zpool: return pool size in pages	2024-04-25 20:55:48 -07:00
zsmalloc.c	ALong with the usual shower of singleton patches, notable patch series in	2024-09-21 07:29:05 -07:00
zswap.c	mm: zswap: delete comments for "value" member of 'struct zswap_entry'.	2024-10-09 12:47:19 -07:00