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David Howells 73e10ded33 mm: Add set/end/wait functions for PG_private_2 
Add three functions to manipulate PG_private_2:

 (*) set_page_private_2() - Set the flag and take an appropriate reference
     on the flagged page.

 (*) end_page_private_2() - Clear the flag, drop the reference and wake up
     any waiters, somewhat analogously with end_page_writeback().

 (*) wait_on_page_private_2() - Wait for the flag to be cleared.

Wrappers will need to be placed in the netfs lib header in the patch that
adds that.

[This implements a suggestion by Linus[1] to not mix the terminology of
 PG_private_2 and PG_fscache in the mm core function]

Changes:
v7:
- Use compound_head() in all the functions to make them THP safe[6].

v5:
- Add set and end functions, calling the end function end rather than
  unlock[3].
- Keep a ref on the page when PG_private_2 is set[4][5].

v4:
- Remove extern from the declaration[2].

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Tested-by: Jeff Layton <jlayton@kernel.org>
Tested-by: Dave Wysochanski <dwysocha@redhat.com>
Tested-By: Marc Dionne <marc.dionne@auristor.com>
cc: Alexander Viro <viro@zeniv.linux.org.uk>
cc: Christoph Hellwig <hch@lst.de>
cc: linux-mm@kvack.org
cc: linux-cachefs@redhat.com
cc: linux-afs@lists.infradead.org
cc: linux-nfs@vger.kernel.org
cc: linux-cifs@vger.kernel.org
cc: ceph-devel@vger.kernel.org
cc: v9fs-developer@lists.sourceforge.net
cc: linux-fsdevel@vger.kernel.org
Link: https://lore.kernel.org/r/1330473.1612974547@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/CAHk-=wjgA-74ddehziVk=XAEMTKswPu1Yw4uaro1R3ibs27ztw@mail.gmail.com/ [1]
Link: https://lore.kernel.org/r/20210216102659.GA27714@lst.de/ [2]
Link: https://lore.kernel.org/r/161340387944.1303470.7944159520278177652.stgit@warthog.procyon.org.uk/ # v3
Link: https://lore.kernel.org/r/161539528910.286939.1252328699383291173.stgit@warthog.procyon.org.uk # v4
Link: https://lore.kernel.org/r/20210321105309.GG3420@casper.infradead.org [3]
Link: https://lore.kernel.org/r/CAHk-=wh+2gbF7XEjYc=HV9w_2uVzVf7vs60BPz0gFA=+pUm3ww@mail.gmail.com/ [4]
Link: https://lore.kernel.org/r/CAHk-=wjSGsRj7xwhSMQ6dAQiz53xA39pOG+XA_WeTgwBBu4uqg@mail.gmail.com/ [5]
Link: https://lore.kernel.org/r/20210408145057.GN2531743@casper.infradead.org/ [6]
Link: https://lore.kernel.org/r/161653788200.2770958.9517755716374927208.stgit@warthog.procyon.org.uk/ # v5
Link: https://lore.kernel.org/r/161789066013.6155.9816857201817288382.stgit@warthog.procyon.org.uk/ # v6
2021-04-23 09:20:49 +01:00
..
kasan
kasan: clarify that only first bug is reported in HW_TAGS
2021-02-26 09:41:03 -08:00
kfence
kfence: fix reports if constant function prefixes exist
2021-03-13 11:27:30 -08:00
backing-dev.c
mm/backing-dev.c: use might_alloc()
2021-02-26 09:41:01 -08:00
balloon_compaction.c
mm/balloon_compaction: suppress allocation warnings
2019-09-04 07:42:01 -04:00
cleancache.c
Driver Core and debugfs changes for 5.3-rc1
2019-07-12 12:24:03 -07:00
cma_debug.c
debugfs: make sure we can remove u32_array files cleanly
2020-07-10 13:54:00 -07:00
cma.c
mm: cma: print region name on failure
2021-02-26 09:41:00 -08:00
cma.h
mm: cma: use CMA_MAX_NAME to define the length of cma name array
2020-09-01 09:19:43 +02:00
compaction.c
mm, compaction: make fast_isolate_freepages() stay within zone
2021-02-24 13:38:34 -08:00
debug_page_ref.c
…
debug_vm_pgtable.c
mm/debug_vm_pgtable/basic: iterate over entire protection_map[]
2021-02-24 13:38:27 -08:00
debug.c
mm/debug: improve memcg debugging
2021-02-24 13:38:27 -08:00
dmapool.c
mm/dmapool: use might_alloc()
2021-02-26 09:41:01 -08:00
early_ioremap.c
mm/early_ioremap.c: use __func__ instead of function name
2021-02-26 09:41:02 -08:00
fadvise.c
mm, fadvise: improve the expensive remote LRU cache draining after FADV_DONTNEED
2020-10-13 18:38:29 -07:00
failslab.c
mm/failslab.c: by default, do not fail allocations with direct reclaim only
2019-07-12 11:05:43 -07:00
filemap.c
mm: Add set/end/wait functions for PG_private_2
2021-04-23 09:20:49 +01:00
frontswap.c
mm/frontswap: mark various intentional data races
2020-08-14 19:56:56 -07:00
gup_test.c
mm/gup_test.c: mark gup_test_init as __init function
2020-12-15 12:13:38 -08:00
gup_test.h
selftests/vm: gup_test: introduce the dump_pages() sub-test
2020-12-15 12:13:38 -08:00
gup.c
mm/hugetlb: grab head page refcount once for group of subpages
2021-02-24 13:38:32 -08:00
highmem.c
mm/highmem.c: fix zero_user_segments() with start > end
2021-03-13 11:27:30 -08:00
hmm.c
mm: do page fault accounting in handle_mm_fault
2020-08-12 10:58:02 -07:00
huge_memory.c
mm/memcg: rename mem_cgroup_split_huge_fixup to split_page_memcg and add nr_pages argument
2021-03-13 11:27:31 -08:00
hugetlb_cgroup.c
hugetlb_cgroup: use helper pages_per_huge_page() in hugetlb_cgroup
2021-02-24 13:38:33 -08:00
hugetlb.c
hugetlb: do early cow when page pinned on src mm
2021-03-13 11:27:30 -08:00
hwpoison-inject.c
mm,hwpoison-inject: don't pin for hwpoison_filter
2020-10-16 11:11:16 -07:00
init-mm.c
mm/gup: prevent gup_fast from racing with COW during fork
2020-12-15 12:13:39 -08:00
internal.h
mm: introduce page_needs_cow_for_dma() for deciding whether cow
2021-03-13 11:27:30 -08:00
interval_tree.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 248
2019-06-19 17:09:08 +02:00
ioremap.c
mm: move p?d_alloc_track to separate header file
2020-08-07 11:33:26 -07:00
Kconfig
media: videobuf2: Move frame_vector into media subsystem
2021-01-12 14:15:31 +01:00
Kconfig.debug
mm, page_poison: remove CONFIG_PAGE_POISONING_ZERO
2020-12-15 12:13:46 -08:00
khugepaged.c
mm,thp,shmem: make khugepaged obey tmpfs mount flags
2021-02-26 09:40:59 -08:00
kmemleak.c
mm/kmemleak: rely on rcu for task stack scanning
2020-10-13 18:38:27 -07:00
ksm.c
mm: cleanup kstrto*() usage
2020-12-15 12:13:47 -08:00
list_lru.c
mm/list_lru.c: remove kvfree_rcu_local()
2021-02-24 13:38:30 -08:00
maccess.c
uaccess: add force_uaccess_{begin,end} helpers
2020-08-12 10:57:59 -07:00
madvise.c
mm/madvise: replace ptrace attach requirement for process_madvise
2021-03-13 11:27:30 -08:00
Makefile
mm: add Kernel Electric-Fence infrastructure
2021-02-26 09:41:02 -08:00
mapping_dirty_helpers.c
mm/mapping_dirty_helpers: enhance the kernel-doc markups
2020-12-15 12:13:41 -08:00
memblock.c
memblock: remove return value of memblock_free_all()
2021-02-22 13:01:23 -08:00
memcontrol.c
mm/memcg: rename mem_cgroup_split_huge_fixup to split_page_memcg and add nr_pages argument
2021-03-13 11:27:31 -08:00
memfd.c
mm: page cache: store only head pages in i_pages
2019-09-24 15:54:08 -07:00
memory_hotplug.c
arm64: mte: Map hotplugged memory as Normal Tagged
2021-03-10 10:56:46 +00:00
memory-failure.c
mm: fix memory_failure() handling of dax-namespace metadata
2021-02-26 09:41:00 -08:00
memory.c
mm/userfaultfd: fix memory corruption due to writeprotect
2021-03-13 11:27:31 -08:00
mempolicy.c
mm/mempolicy: use helper range_in_vma() in queue_pages_test_walk()
2021-02-24 13:38:34 -08:00
mempool.c
kasan: move _RET_IP_ to inline wrappers
2021-02-24 13:38:31 -08:00
memremap.c
mm/memory_hotplug: prevalidate the address range being added with platform
2021-02-26 09:41:00 -08:00
memtest.c
…
migrate.c
mm: memcg: add swapcache stat for memcg v2
2021-02-24 13:38:29 -08:00
mincore.c
inode: make init and permission helpers idmapped mount aware
2021-01-24 14:27:16 +01:00
mlock.c
mm/mlock: stop counting mlocked pages when none vma is found
2021-02-26 09:41:01 -08:00
mm_init.c
mm: fix fall-through warnings for Clang
2020-12-15 12:13:47 -08:00
mmap_lock.c
mm: mmap_lock: add tracepoints around lock acquisition
2020-12-15 12:13:41 -08:00
mmap.c
mm/mmap.c: remove unnecessary local variable
2021-02-24 13:38:30 -08:00
mmu_gather.c
tlb: mmu_gather: Remove start/end arguments from tlb_gather_mmu()
2021-01-29 20:02:29 +01:00
mmu_notifier.c
mm: track mmu notifiers in fs_reclaim_acquire/release
2020-12-15 12:13:41 -08:00
mmzone.c
mm/lru: replace pgdat lru_lock with lruvec lock
2020-12-15 14:48:04 -08:00
mprotect.c
mm/mprotect.c: optimize error detection in do_mprotect_pkey()
2021-02-24 13:38:30 -08:00
mremap.c
mm: mremap: unlink anon_vmas when mremap with MREMAP_DONTUNMAP success
2021-02-24 13:38:30 -08:00
msync.c
mmap locking API: use coccinelle to convert mmap_sem rwsem call sites
2020-06-09 09:39:14 -07:00
nommu.c
mm/nommu: Fix return type of filemap_map_pages()
2021-01-28 14:10:31 +00:00
oom_kill.c
mm, oom: fix a comment in dump_task()
2021-02-24 13:38:34 -08:00
page_alloc.c
mm/memcg: set memcg when splitting page
2021-03-13 11:27:31 -08:00
page_counter.c
mm/page_counter: use page_counter_read in page_counter_set_max
2020-12-15 12:13:40 -08:00
page_ext.c
mm: fix some spelling mistakes in comments
2020-12-15 22:46:19 -08:00
page_idle.c
mm: page_idle_get_page() does not need lru_lock
2020-12-15 14:48:03 -08:00
page_io.c
swap: fix swapfile read/write offset
2021-03-02 17:25:46 -07:00
page_isolation.c
mm/page_isolation: do not isolate the max order page
2020-12-15 12:13:45 -08:00
page_owner.c
mm/page_owner: use helper function zone_end_pfn() to get end_pfn
2021-02-24 13:38:27 -08:00
page_poison.c
kasan, mm: reset tags when accessing metadata
2020-12-22 12:55:08 -08:00
page_reporting.c
mm/page_reporting: use list_entry_is_head() in page_reporting_cycle()
2021-02-24 13:38:30 -08:00
page_reporting.h
mm: introduce include/linux/pgtable.h
2020-06-09 09:39:13 -07:00
page_vma_mapped.c
mm/page_vma_mapped.c: add colon to fix kernel-doc markups error for check_pte
2020-12-15 12:13:41 -08:00
page-writeback.c
mm/writeback: Add wait_on_page_writeback_killable
2021-03-23 20:54:29 +00:00
pagewalk.c
mmap locking API: convert mmap_sem comments
2020-06-09 09:39:14 -07:00
percpu-internal.h
mm: memcg/percpu: account percpu memory to memory cgroups
2020-08-12 10:57:55 -07:00
percpu-km.c
mm: memcg/percpu: account percpu memory to memory cgroups
2020-08-12 10:57:55 -07:00
percpu-stats.c
mm: memcg/percpu: account percpu memory to memory cgroups
2020-08-12 10:57:55 -07:00
percpu-vm.c
mm: memcg/percpu: account percpu memory to memory cgroups
2020-08-12 10:57:55 -07:00
percpu.c
percpu: fix clang modpost section mismatch
2021-02-14 18:15:15 +00:00
pgalloc-track.h
mm: move p?d_alloc_track to separate header file
2020-08-07 11:33:26 -07:00
pgtable-generic.c
mm/pgtable-generic.c: optimize the VM_BUG_ON condition in pmdp_huge_clear_flush()
2021-02-24 13:38:30 -08:00
process_vm_access.c
mm/process_vm_access.c: include compat.h
2021-01-12 18:12:54 -08:00
ptdump.c
kasan, arm64: expand CONFIG_KASAN checks
2020-12-22 12:55:08 -08:00
readahead.c
mm: use limited read-ahead to satisfy read
2020-10-17 13:49:08 -06:00
rmap.c
mm/rmap: correct obsolete comment of page_get_anon_vma()
2021-02-26 09:41:01 -08:00
rodata_test.c
mm/rodata_test.c: fix missing function declaration
2020-08-21 09:52:53 -07:00
shmem.c
mm,shmem,thp: limit shmem THP allocations to requested zones
2021-02-26 09:40:59 -08:00
shuffle.c
mm: rename page_order() to buddy_order()
2020-10-16 11:11:19 -07:00
shuffle.h
mm/shuffle: remove dynamic reconfiguration
2020-08-07 11:33:29 -07:00
slab_common.c
kasan, mm: optimize krealloc poisoning
2021-02-26 09:41:03 -08:00
slab.c
kfence, slab: fix cache_alloc_debugcheck_after() for bulk allocations
2021-03-13 11:27:30 -08:00
slab.h
mm: memcg/slab: pre-allocate obj_cgroups for slab caches with SLAB_ACCOUNT
2021-02-24 13:38:29 -08:00
slob.c
mm, tracing: record slab name for kmem_cache_free()
2021-02-24 13:38:26 -08:00
slub.c
Revert "mm, slub: consider rest of partial list if acquire_slab() fails"
2021-03-10 10:18:04 -08:00
sparse-vmemmap.c
mm/sparse: only sub-section aligned range would be populated
2020-08-07 11:33:27 -07:00
sparse.c
mm/memory_hotplug: guard more declarations by CONFIG_MEMORY_HOTPLUG
2020-10-16 11:11:18 -07:00
swap_cgroup.c
mm: memcontrol: make swap tracking an integral part of memory control
2020-06-03 20:09:48 -07:00
swap_slots.c
mm/swap_slots.c: remove redundant NULL check
2021-02-24 13:38:28 -08:00
swap_state.c
mm: add FGP_ENTRY
2021-02-26 09:40:59 -08:00
swap.c
mm: remove pagevec_lookup_entries
2021-02-26 09:40:59 -08:00
swapfile.c
swap: fix swapfile read/write offset
2021-03-02 17:25:46 -07:00
truncate.c
mm: remove pagevec_lookup_entries
2021-02-26 09:40:59 -08:00
usercopy.c
mm/usercopy.c: delete duplicated word
2020-08-12 10:57:58 -07:00
userfaultfd.c
mm/vmscan: protect the workingset on anonymous LRU
2020-08-12 10:57:55 -07:00
util.c
mm: Make mem_dump_obj() handle vmalloc() memory
2021-01-22 15:24:04 -08:00
vmacache.c
kernel: better document the use_mm/unuse_mm API contract
2020-06-10 19:14:18 -07:00
vmalloc.c
Merge branch 'for-mingo-rcu' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into core/rcu
2021-02-12 12:56:55 +01:00
vmpressure.c
mm: vmpressure: use mem_cgroup_is_root API
2020-04-02 09:35:31 -07:00
vmscan.c
mm/vmscan: restore zone_reclaim_mode ABI
2021-02-24 13:38:34 -08:00
vmstat.c
mm/vmstat.c: erase latency in vmstat_shepherd
2021-02-26 09:41:00 -08:00
workingset.c
mm: workingset: clarify eviction order and distance calculation
2021-02-24 13:38:34 -08:00
z3fold.c
mm: set the sleep_mapped to true for zbud and z3fold
2021-02-26 09:41:01 -08:00
zbud.c
mm: set the sleep_mapped to true for zbud and z3fold
2021-02-26 09:41:01 -08:00
zpool.c
mm/zswap: add the flag can_sleep_mapped
2021-02-26 09:41:01 -08:00
zsmalloc.c
mm/zsmalloc.c: use page_private() to access page->private
2021-02-26 09:41:01 -08:00
zswap.c
mm/zswap: add the flag can_sleep_mapped
2021-02-26 09:41:01 -08:00