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https://github.com/torvalds/linux.git
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c2aa6f5328
264 Commits
| Author | SHA1 | Message | Date | |
|---|---|---|---|---|
Linus Torvalds
|
bedf149527 |
New code for 6.4:
* Remove an unused symbol. * Add tracepoints for the directio code. Signed-off-by: Darrick J. Wong <djwong@kernel.org> -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQQ2qTKExjcn+O1o2YRKO3ySh0YRpgUCZEKzuQAKCRBKO3ySh0YR pothAQD9sBm7//+vYXxQXPlmX09Jvxixnlwyth+PvUI2Al3mrgEA0h1ZSRhxBbxx QiIFXCQYckb9GTIcRd67lCp1j/Ie/g0= =vGbm -----END PGP SIGNATURE----- Merge tag 'iomap-6.4-merge-1' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux Pull iomap updates from Darrick Wong: "The only changes for this cycle are the addition of tracepoints to the iomap directio code so that Ritesh (who is working on porting ext2 to iomap) can observe the io flows more easily. Summary: - Remove an unused symbol - Add tracepoints for the directio code" * tag 'iomap-6.4-merge-1' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux: iomap: Add DIO tracepoints iomap: Remove IOMAP_DIO_NOSYNC unused dio flag fs.h: Add TRACE_IOCB_STRINGS for use in trace points |
||
|
Linus Torvalds
|
7fa8a8ee94 |
- Nick Piggin's "shoot lazy tlbs" series, to improve the peformance of
switching from a user process to a kernel thread.
- More folio conversions from Kefeng Wang, Zhang Peng and Pankaj Raghav.
- zsmalloc performance improvements from Sergey Senozhatsky.
- Yue Zhao has found and fixed some data race issues around the
alteration of memcg userspace tunables.
- VFS rationalizations from Christoph Hellwig:
- removal of most of the callers of write_one_page().
- make __filemap_get_folio()'s return value more useful
- Luis Chamberlain has changed tmpfs so it no longer requires swap
backing. Use `mount -o noswap'.
- Qi Zheng has made the slab shrinkers operate locklessly, providing
some scalability benefits.
- Keith Busch has improved dmapool's performance, making part of its
operations O(1) rather than O(n).
- Peter Xu adds the UFFD_FEATURE_WP_UNPOPULATED feature to userfaultd,
permitting userspace to wr-protect anon memory unpopulated ptes.
- Kirill Shutemov has changed MAX_ORDER's meaning to be inclusive rather
than exclusive, and has fixed a bunch of errors which were caused by its
unintuitive meaning.
- Axel Rasmussen give userfaultfd the UFFDIO_CONTINUE_MODE_WP feature,
which causes minor faults to install a write-protected pte.
- Vlastimil Babka has done some maintenance work on vma_merge():
cleanups to the kernel code and improvements to our userspace test
harness.
- Cleanups to do_fault_around() by Lorenzo Stoakes.
- Mike Rapoport has moved a lot of initialization code out of various
mm/ files and into mm/mm_init.c.
- Lorenzo Stoakes removd vmf_insert_mixed_prot(), which was added for
DRM, but DRM doesn't use it any more.
- Lorenzo has also coverted read_kcore() and vread() to use iterators
and has thereby removed the use of bounce buffers in some cases.
- Lorenzo has also contributed further cleanups of vma_merge().
- Chaitanya Prakash provides some fixes to the mmap selftesting code.
- Matthew Wilcox changes xfs and afs so they no longer take sleeping
locks in ->map_page(), a step towards RCUification of pagefaults.
- Suren Baghdasaryan has improved mmap_lock scalability by switching to
per-VMA locking.
- Frederic Weisbecker has reworked the percpu cache draining so that it
no longer causes latency glitches on cpu isolated workloads.
- Mike Rapoport cleans up and corrects the ARCH_FORCE_MAX_ORDER Kconfig
logic.
- Liu Shixin has changed zswap's initialization so we no longer waste a
chunk of memory if zswap is not being used.
- Yosry Ahmed has improved the performance of memcg statistics flushing.
- David Stevens has fixed several issues involving khugepaged,
userfaultfd and shmem.
- Christoph Hellwig has provided some cleanup work to zram's IO-related
code paths.
- David Hildenbrand has fixed up some issues in the selftest code's
testing of our pte state changing.
- Pankaj Raghav has made page_endio() unneeded and has removed it.
- Peter Xu contributed some rationalizations of the userfaultfd
selftests.
- Yosry Ahmed has fixed an issue around memcg's page recalim accounting.
- Chaitanya Prakash has fixed some arm-related issues in the
selftests/mm code.
- Longlong Xia has improved the way in which KSM handles hwpoisoned
pages.
- Peter Xu fixes a few issues with uffd-wp at fork() time.
- Stefan Roesch has changed KSM so that it may now be used on a
per-process and per-cgroup basis.
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Merge tag 'mm-stable-2023-04-27-15-30' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull MM updates from Andrew Morton:
- Nick Piggin's "shoot lazy tlbs" series, to improve the peformance of
switching from a user process to a kernel thread.
- More folio conversions from Kefeng Wang, Zhang Peng and Pankaj
Raghav.
- zsmalloc performance improvements from Sergey Senozhatsky.
- Yue Zhao has found and fixed some data race issues around the
alteration of memcg userspace tunables.
- VFS rationalizations from Christoph Hellwig:
- removal of most of the callers of write_one_page()
- make __filemap_get_folio()'s return value more useful
- Luis Chamberlain has changed tmpfs so it no longer requires swap
backing. Use `mount -o noswap'.
- Qi Zheng has made the slab shrinkers operate locklessly, providing
some scalability benefits.
- Keith Busch has improved dmapool's performance, making part of its
operations O(1) rather than O(n).
- Peter Xu adds the UFFD_FEATURE_WP_UNPOPULATED feature to userfaultd,
permitting userspace to wr-protect anon memory unpopulated ptes.
- Kirill Shutemov has changed MAX_ORDER's meaning to be inclusive
rather than exclusive, and has fixed a bunch of errors which were
caused by its unintuitive meaning.
- Axel Rasmussen give userfaultfd the UFFDIO_CONTINUE_MODE_WP feature,
which causes minor faults to install a write-protected pte.
- Vlastimil Babka has done some maintenance work on vma_merge():
cleanups to the kernel code and improvements to our userspace test
harness.
- Cleanups to do_fault_around() by Lorenzo Stoakes.
- Mike Rapoport has moved a lot of initialization code out of various
mm/ files and into mm/mm_init.c.
- Lorenzo Stoakes removd vmf_insert_mixed_prot(), which was added for
DRM, but DRM doesn't use it any more.
- Lorenzo has also coverted read_kcore() and vread() to use iterators
and has thereby removed the use of bounce buffers in some cases.
- Lorenzo has also contributed further cleanups of vma_merge().
- Chaitanya Prakash provides some fixes to the mmap selftesting code.
- Matthew Wilcox changes xfs and afs so they no longer take sleeping
locks in ->map_page(), a step towards RCUification of pagefaults.
- Suren Baghdasaryan has improved mmap_lock scalability by switching to
per-VMA locking.
- Frederic Weisbecker has reworked the percpu cache draining so that it
no longer causes latency glitches on cpu isolated workloads.
- Mike Rapoport cleans up and corrects the ARCH_FORCE_MAX_ORDER Kconfig
logic.
- Liu Shixin has changed zswap's initialization so we no longer waste a
chunk of memory if zswap is not being used.
- Yosry Ahmed has improved the performance of memcg statistics
flushing.
- David Stevens has fixed several issues involving khugepaged,
userfaultfd and shmem.
- Christoph Hellwig has provided some cleanup work to zram's IO-related
code paths.
- David Hildenbrand has fixed up some issues in the selftest code's
testing of our pte state changing.
- Pankaj Raghav has made page_endio() unneeded and has removed it.
- Peter Xu contributed some rationalizations of the userfaultfd
selftests.
- Yosry Ahmed has fixed an issue around memcg's page recalim
accounting.
- Chaitanya Prakash has fixed some arm-related issues in the
selftests/mm code.
- Longlong Xia has improved the way in which KSM handles hwpoisoned
pages.
- Peter Xu fixes a few issues with uffd-wp at fork() time.
- Stefan Roesch has changed KSM so that it may now be used on a
per-process and per-cgroup basis.
* tag 'mm-stable-2023-04-27-15-30' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (369 commits)
mm,unmap: avoid flushing TLB in batch if PTE is inaccessible
shmem: restrict noswap option to initial user namespace
mm/khugepaged: fix conflicting mods to collapse_file()
sparse: remove unnecessary 0 values from rc
mm: move 'mmap_min_addr' logic from callers into vm_unmapped_area()
hugetlb: pte_alloc_huge() to replace huge pte_alloc_map()
maple_tree: fix allocation in mas_sparse_area()
mm: do not increment pgfault stats when page fault handler retries
zsmalloc: allow only one active pool compaction context
selftests/mm: add new selftests for KSM
mm: add new KSM process and sysfs knobs
mm: add new api to enable ksm per process
mm: shrinkers: fix debugfs file permissions
mm: don't check VMA write permissions if the PTE/PMD indicates write permissions
migrate_pages_batch: fix statistics for longterm pin retry
userfaultfd: use helper function range_in_vma()
lib/show_mem.c: use for_each_populated_zone() simplify code
mm: correct arg in reclaim_pages()/reclaim_clean_pages_from_list()
fs/buffer: convert create_page_buffers to folio_create_buffers
fs/buffer: add folio_create_empty_buffers helper
...
|
||
Ritesh Harjani (IBM)
|
3fd41721cd |
iomap: Add DIO tracepoints
Add trace_iomap_dio_rw_begin, trace_iomap_dio_rw_queued and
trace_iomap_dio_complete tracepoint.
trace_iomap_dio_rw_queued is mostly only to know that the request was
queued and -EIOCBQUEUED was returned. It is mostly trace_iomap_dio_rw_begin
& trace_iomap_dio_complete which has all the details.
<example output log>
a.out-2073 [006] 134.225717: iomap_dio_rw_begin: dev 7:7 ino 0xe size 0x0 offset 0x0 length 0x1000 done_before 0x0 flags DIRECT|WRITE dio_flags DIO_FORCE_WAIT aio 1
a.out-2073 [006] 134.226234: iomap_dio_complete: dev 7:7 ino 0xe size 0x1000 offset 0x1000 flags DIRECT|WRITE aio 1 error 0 ret 4096
a.out-2074 [006] 136.225975: iomap_dio_rw_begin: dev 7:7 ino 0xe size 0x1000 offset 0x0 length 0x1000 done_before 0x0 flags DIRECT dio_flags aio 1
a.out-2074 [006] 136.226173: iomap_dio_rw_queued: dev 7:7 ino 0xe size 0x1000 offset 0x1000 length 0x0
ksoftirqd/3-31 [003] 136.226389: iomap_dio_complete: dev 7:7 ino 0xe size 0x1000 offset 0x1000 flags DIRECT aio 1 error 0 ret 4096
a.out-2075 [003] 141.674969: iomap_dio_rw_begin: dev 7:7 ino 0xe size 0x1000 offset 0x0 length 0x1000 done_before 0x0 flags DIRECT|WRITE dio_flags aio 1
a.out-2075 [003] 141.676085: iomap_dio_rw_queued: dev 7:7 ino 0xe size 0x1000 offset 0x1000 length 0x0
kworker/2:0-27 [002] 141.676432: iomap_dio_complete: dev 7:7 ino 0xe size 0x1000 offset 0x1000 flags DIRECT|WRITE aio 1 error 0 ret 4096
a.out-2077 [006] 143.443746: iomap_dio_rw_begin: dev 7:7 ino 0xe size 0x1000 offset 0x0 length 0x1000 done_before 0x0 flags DIRECT dio_flags aio 1
a.out-2077 [006] 143.443866: iomap_dio_rw_queued: dev 7:7 ino 0xe size 0x1000 offset 0x1000 length 0x0
ksoftirqd/5-41 [005] 143.444134: iomap_dio_complete: dev 7:7 ino 0xe size 0x1000 offset 0x1000 flags DIRECT aio 1 error 0 ret 4096
a.out-2078 [007] 146.716833: iomap_dio_rw_begin: dev 7:7 ino 0xe size 0x1000 offset 0x0 length 0x1000 done_before 0x0 flags DIRECT dio_flags aio 0
a.out-2078 [007] 146.717639: iomap_dio_complete: dev 7:7 ino 0xe size 0x1000 offset 0x1000 flags DIRECT aio 0 error 0 ret 4096
a.out-2079 [006] 148.972605: iomap_dio_rw_begin: dev 7:7 ino 0xe size 0x1000 offset 0x0 length 0x1000 done_before 0x0 flags DIRECT dio_flags aio 0
a.out-2079 [006] 148.973099: iomap_dio_complete: dev 7:7 ino 0xe size 0x1000 offset 0x1000 flags DIRECT aio 0 error 0 ret 4096
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
[djwong: line up strings all prettylike]
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
|
||
|
Ritesh Harjani (IBM)
|
d3bff1fc50 |
iomap: Remove IOMAP_DIO_NOSYNC unused dio flag
IOMAP_DIO_NOSYNC earlier was added for use in btrfs. But it seems for aio dsync writes this is not useful anyway. For aio dsync case, we we queue the request and return -EIOCBQUEUED. Now, since IOMAP_DIO_NOSYNC doesn't let iomap_dio_complete() to call generic_write_sync(), hence we may lose the sync write. Hence kill this flag as it is not in use by any FS now. Tested-by: Disha Goel <disgoel@linux.ibm.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com> Signed-off-by: Darrick J. Wong <djwong@kernel.org> |
||
Matthew Wilcox
|
e999a5c5a1 |
fs: Add FGP_WRITEBEGIN
This particular combination of flags is used by most filesystems in their ->write_begin method, although it does find use in a few other places. Before folios, it warranted its own function (grab_cache_page_write_begin()), but I think that just having specialised flags is enough. It certainly helps the few places that have been converted from grab_cache_page_write_begin() to __filemap_get_folio(). Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Link: https://lore.kernel.org/r/20230324180129.1220691-2-willy@infradead.org Signed-off-by: Theodore Ts'o <tytso@mit.edu> |
||
Christoph Hellwig
|
66dabbb65d |
mm: return an ERR_PTR from __filemap_get_folio
Instead of returning NULL for all errors, distinguish between: - no entry found and not asked to allocated (-ENOENT) - failed to allocate memory (-ENOMEM) - would block (-EAGAIN) so that callers don't have to guess the error based on the passed in flags. Also pass through the error through the direct callers: filemap_get_folio, filemap_lock_folio filemap_grab_folio and filemap_get_incore_folio. [hch@lst.de: fix null-pointer deref] Link: https://lkml.kernel.org/r/20230310070023.GA13563@lst.de Link: https://lkml.kernel.org/r/20230310043137.GA1624890@u2004 Link: https://lkml.kernel.org/r/20230307143410.28031-8-hch@lst.de Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Ryusuke Konishi <konishi.ryusuke@gmail.com> [nilfs2] Cc: Andreas Gruenbacher <agruenba@redhat.com> Cc: Hugh Dickins <hughd@google.com> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Naoya Horiguchi <naoya.horiguchi@linux.dev> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
||
|
Linus Torvalds
|
3822a7c409 |
- Daniel Verkamp has contributed a memfd series ("mm/memfd: add
F_SEAL_EXEC") which permits the setting of the memfd execute bit at
memfd creation time, with the option of sealing the state of the X bit.
- Peter Xu adds a patch series ("mm/hugetlb: Make huge_pte_offset()
thread-safe for pmd unshare") which addresses a rare race condition
related to PMD unsharing.
- Several folioification patch serieses from Matthew Wilcox, Vishal
Moola, Sidhartha Kumar and Lorenzo Stoakes
- Johannes Weiner has a series ("mm: push down lock_page_memcg()") which
does perform some memcg maintenance and cleanup work.
- SeongJae Park has added DAMOS filtering to DAMON, with the series
"mm/damon/core: implement damos filter". These filters provide users
with finer-grained control over DAMOS's actions. SeongJae has also done
some DAMON cleanup work.
- Kairui Song adds a series ("Clean up and fixes for swap").
- Vernon Yang contributed the series "Clean up and refinement for maple
tree".
- Yu Zhao has contributed the "mm: multi-gen LRU: memcg LRU" series. It
adds to MGLRU an LRU of memcgs, to improve the scalability of global
reclaim.
- David Hildenbrand has added some userfaultfd cleanup work in the
series "mm: uffd-wp + change_protection() cleanups".
- Christoph Hellwig has removed the generic_writepages() library
function in the series "remove generic_writepages".
- Baolin Wang has performed some maintenance on the compaction code in
his series "Some small improvements for compaction".
- Sidhartha Kumar is doing some maintenance work on struct page in his
series "Get rid of tail page fields".
- David Hildenbrand contributed some cleanup, bugfixing and
generalization of pte management and of pte debugging in his series "mm:
support __HAVE_ARCH_PTE_SWP_EXCLUSIVE on all architectures with swap
PTEs".
- Mel Gorman and Neil Brown have removed the __GFP_ATOMIC allocation
flag in the series "Discard __GFP_ATOMIC".
- Sergey Senozhatsky has improved zsmalloc's memory utilization with his
series "zsmalloc: make zspage chain size configurable".
- Joey Gouly has added prctl() support for prohibiting the creation of
writeable+executable mappings. The previous BPF-based approach had
shortcomings. See "mm: In-kernel support for memory-deny-write-execute
(MDWE)".
- Waiman Long did some kmemleak cleanup and bugfixing in the series
"mm/kmemleak: Simplify kmemleak_cond_resched() & fix UAF".
- T.J. Alumbaugh has contributed some MGLRU cleanup work in his series
"mm: multi-gen LRU: improve".
- Jiaqi Yan has provided some enhancements to our memory error
statistics reporting, mainly by presenting the statistics on a per-node
basis. See the series "Introduce per NUMA node memory error
statistics".
- Mel Gorman has a second and hopefully final shot at fixing a CPU-hog
regression in compaction via his series "Fix excessive CPU usage during
compaction".
- Christoph Hellwig does some vmalloc maintenance work in the series
"cleanup vfree and vunmap".
- Christoph Hellwig has removed block_device_operations.rw_page() in ths
series "remove ->rw_page".
- We get some maple_tree improvements and cleanups in Liam Howlett's
series "VMA tree type safety and remove __vma_adjust()".
- Suren Baghdasaryan has done some work on the maintainability of our
vm_flags handling in the series "introduce vm_flags modifier functions".
- Some pagemap cleanup and generalization work in Mike Rapoport's series
"mm, arch: add generic implementation of pfn_valid() for FLATMEM" and
"fixups for generic implementation of pfn_valid()"
- Baoquan He has done some work to make /proc/vmallocinfo and
/proc/kcore better represent the real state of things in his series
"mm/vmalloc.c: allow vread() to read out vm_map_ram areas".
- Jason Gunthorpe rationalized the GUP system's interface to the rest of
the kernel in the series "Simplify the external interface for GUP".
- SeongJae Park wishes to migrate people from DAMON's debugfs interface
over to its sysfs interface. To support this, we'll temporarily be
printing warnings when people use the debugfs interface. See the series
"mm/damon: deprecate DAMON debugfs interface".
- Andrey Konovalov provided the accurately named "lib/stackdepot: fixes
and clean-ups" series.
- Huang Ying has provided a dramatic reduction in migration's TLB flush
IPI rates with the series "migrate_pages(): batch TLB flushing".
- Arnd Bergmann has some objtool fixups in "objtool warning fixes".
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Merge tag 'mm-stable-2023-02-20-13-37' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull MM updates from Andrew Morton:
- Daniel Verkamp has contributed a memfd series ("mm/memfd: add
F_SEAL_EXEC") which permits the setting of the memfd execute bit at
memfd creation time, with the option of sealing the state of the X
bit.
- Peter Xu adds a patch series ("mm/hugetlb: Make huge_pte_offset()
thread-safe for pmd unshare") which addresses a rare race condition
related to PMD unsharing.
- Several folioification patch serieses from Matthew Wilcox, Vishal
Moola, Sidhartha Kumar and Lorenzo Stoakes
- Johannes Weiner has a series ("mm: push down lock_page_memcg()")
which does perform some memcg maintenance and cleanup work.
- SeongJae Park has added DAMOS filtering to DAMON, with the series
"mm/damon/core: implement damos filter".
These filters provide users with finer-grained control over DAMOS's
actions. SeongJae has also done some DAMON cleanup work.
- Kairui Song adds a series ("Clean up and fixes for swap").
- Vernon Yang contributed the series "Clean up and refinement for maple
tree".
- Yu Zhao has contributed the "mm: multi-gen LRU: memcg LRU" series. It
adds to MGLRU an LRU of memcgs, to improve the scalability of global
reclaim.
- David Hildenbrand has added some userfaultfd cleanup work in the
series "mm: uffd-wp + change_protection() cleanups".
- Christoph Hellwig has removed the generic_writepages() library
function in the series "remove generic_writepages".
- Baolin Wang has performed some maintenance on the compaction code in
his series "Some small improvements for compaction".
- Sidhartha Kumar is doing some maintenance work on struct page in his
series "Get rid of tail page fields".
- David Hildenbrand contributed some cleanup, bugfixing and
generalization of pte management and of pte debugging in his series
"mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE on all architectures with
swap PTEs".
- Mel Gorman and Neil Brown have removed the __GFP_ATOMIC allocation
flag in the series "Discard __GFP_ATOMIC".
- Sergey Senozhatsky has improved zsmalloc's memory utilization with
his series "zsmalloc: make zspage chain size configurable".
- Joey Gouly has added prctl() support for prohibiting the creation of
writeable+executable mappings.
The previous BPF-based approach had shortcomings. See "mm: In-kernel
support for memory-deny-write-execute (MDWE)".
- Waiman Long did some kmemleak cleanup and bugfixing in the series
"mm/kmemleak: Simplify kmemleak_cond_resched() & fix UAF".
- T.J. Alumbaugh has contributed some MGLRU cleanup work in his series
"mm: multi-gen LRU: improve".
- Jiaqi Yan has provided some enhancements to our memory error
statistics reporting, mainly by presenting the statistics on a
per-node basis. See the series "Introduce per NUMA node memory error
statistics".
- Mel Gorman has a second and hopefully final shot at fixing a CPU-hog
regression in compaction via his series "Fix excessive CPU usage
during compaction".
- Christoph Hellwig does some vmalloc maintenance work in the series
"cleanup vfree and vunmap".
- Christoph Hellwig has removed block_device_operations.rw_page() in
ths series "remove ->rw_page".
- We get some maple_tree improvements and cleanups in Liam Howlett's
series "VMA tree type safety and remove __vma_adjust()".
- Suren Baghdasaryan has done some work on the maintainability of our
vm_flags handling in the series "introduce vm_flags modifier
functions".
- Some pagemap cleanup and generalization work in Mike Rapoport's
series "mm, arch: add generic implementation of pfn_valid() for
FLATMEM" and "fixups for generic implementation of pfn_valid()"
- Baoquan He has done some work to make /proc/vmallocinfo and
/proc/kcore better represent the real state of things in his series
"mm/vmalloc.c: allow vread() to read out vm_map_ram areas".
- Jason Gunthorpe rationalized the GUP system's interface to the rest
of the kernel in the series "Simplify the external interface for
GUP".
- SeongJae Park wishes to migrate people from DAMON's debugfs interface
over to its sysfs interface. To support this, we'll temporarily be
printing warnings when people use the debugfs interface. See the
series "mm/damon: deprecate DAMON debugfs interface".
- Andrey Konovalov provided the accurately named "lib/stackdepot: fixes
and clean-ups" series.
- Huang Ying has provided a dramatic reduction in migration's TLB flush
IPI rates with the series "migrate_pages(): batch TLB flushing".
- Arnd Bergmann has some objtool fixups in "objtool warning fixes".
* tag 'mm-stable-2023-02-20-13-37' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (505 commits)
include/linux/migrate.h: remove unneeded externs
mm/memory_hotplug: cleanup return value handing in do_migrate_range()
mm/uffd: fix comment in handling pte markers
mm: change to return bool for isolate_movable_page()
mm: hugetlb: change to return bool for isolate_hugetlb()
mm: change to return bool for isolate_lru_page()
mm: change to return bool for folio_isolate_lru()
objtool: add UACCESS exceptions for __tsan_volatile_read/write
kmsan: disable ftrace in kmsan core code
kasan: mark addr_has_metadata __always_inline
mm: memcontrol: rename memcg_kmem_enabled()
sh: initialize max_mapnr
m68k/nommu: add missing definition of ARCH_PFN_OFFSET
mm: percpu: fix incorrect size in pcpu_obj_full_size()
maple_tree: reduce stack usage with gcc-9 and earlier
mm: page_alloc: call panic() when memoryless node allocation fails
mm: multi-gen LRU: avoid futile retries
migrate_pages: move THP/hugetlb migration support check to simplify code
migrate_pages: batch flushing TLB
migrate_pages: share more code between _unmap and _move
...
|
||
|
Linus Torvalds
|
d151e8bea1 |
New code for 6.3:
- Change when the iomap page_done function is called so that we still
have a locked folio in the success case. This fixes a writeback race
in gfs2.
- Change when the iomap page_prepare function is called so that gfs2
can recover from OOM scenarios more gracefully.
- Rename the iomap page_ops to folio_ops, since they operate on folios
now.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Merge tag 'iomap-6.3-merge-1' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux
Pull iomap updates from Darrick Wong:
"This is mostly rearranging things to make life easier for gfs2,
nothing all that mindblowing for this release.
- Change when the iomap page_done function is called so that we still
have a locked folio in the success case. This fixes a writeback
race in gfs2
- Change when the iomap page_prepare function is called so that gfs2
can recover from OOM scenarios more gracefully
- Rename the iomap page_ops to folio_ops, since they operate on
folios now"
* tag 'iomap-6.3-merge-1' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
iomap: Rename page_ops to folio_ops
iomap: Rename page_prepare handler to get_folio
iomap: Add __iomap_get_folio helper
iomap/gfs2: Get page in page_prepare handler
iomap: Add iomap_get_folio helper
iomap: Rename page_done handler to put_folio
iomap/gfs2: Unlock and put folio in page_done handler
iomap: Add __iomap_put_folio helper
|
||
|
Christoph Hellwig
|
8e81aa16a4 |
iomap: remove IOMAP_F_ZONE_APPEND
No users left now that btrfs takes REQ_OP_WRITE bios from iomap and splits and converts them to REQ_OP_ZONE_APPEND internally. Reviewed-by: Josef Bacik <josef@toxicpanda.com> Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: David Sterba <dsterba@suse.com> |
||
|
Matthew Wilcox (Oracle)
|
d585bdbeb7 |
fs: convert writepage_t callback to pass a folio
Patch series "Convert writepage_t to use a folio". More folioisation. I split out the mpage work from everything else because it completely dominated the patch, but some implementations I just converted outright. This patch (of 2): We always write back an entire folio, but that's currently passed as the head page. Convert all filesystems that use write_cache_pages() to expect a folio instead of a page. Link: https://lkml.kernel.org/r/20230126201255.1681189-1-willy@infradead.org Link: https://lkml.kernel.org/r/20230126201255.1681189-2-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Christoph Hellwig <hch@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
||
Andreas Gruenbacher
|
471859f57d |
iomap: Rename page_ops to folio_ops
The operations in struct page_ops all operate on folios, so rename struct page_ops to struct folio_ops. Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de> [djwong: port around not removing iomap_valid] Signed-off-by: Darrick J. Wong <djwong@kernel.org> |
||
|
Andreas Gruenbacher
|
c82abc2394 |
iomap: Rename page_prepare handler to get_folio
The ->page_prepare() handler in struct iomap_page_ops is now somewhat misnamed, so rename it to ->get_folio(). Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Darrick J. Wong <djwong@kernel.org> |
||
|
Andreas Gruenbacher
|
07c22b5668 |
iomap: Add __iomap_get_folio helper
Add an __iomap_get_folio() helper as the counterpart of the existing __iomap_put_folio() helper. Use the new helper in iomap_write_begin(). Not a functional change. Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Signed-off-by: Darrick J. Wong <djwong@kernel.org> |
||
|
Andreas Gruenbacher
|
9060bc4d3a |
iomap/gfs2: Get page in page_prepare handler
Change the iomap ->page_prepare() handler to get and return a locked folio instead of doing that in iomap_write_begin(). This allows to recover from out-of-memory situations in ->page_prepare(), which eliminates the corresponding error handling code in iomap_write_begin(). The ->put_folio() handler now also isn't called with NULL as the folio value anymore. Filesystems are expected to use the iomap_get_folio() helper for getting locked folios in their ->page_prepare() handlers. Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Darrick J. Wong <djwong@kernel.org> |
||
|
Andreas Gruenbacher
|
98321b5139 |
iomap: Add iomap_get_folio helper
Add an iomap_get_folio() helper that gets a folio reference based on an iomap iterator and an offset into the address space. Use it in iomap_write_begin(). Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Darrick J. Wong <djwong@kernel.org> |
||
|
Andreas Gruenbacher
|
40405dddd9 |
iomap: Rename page_done handler to put_folio
The ->page_done() handler in struct iomap_page_ops is now somewhat misnamed in that it mainly deals with unlocking and putting a folio, so rename it to ->put_folio(). Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Darrick J. Wong <djwong@kernel.org> |
||
|
Andreas Gruenbacher
|
80baab88bb |
iomap/gfs2: Unlock and put folio in page_done handler
When an iomap defines a ->page_done() handler in its page_ops, delegate unlocking the folio and putting the folio reference to that handler. This allows to fix a race between journaled data writes and folio writeback in gfs2: before this change, gfs2_iomap_page_done() was called after unlocking the folio, so writeback could start writing back the folio's buffers before they could be marked for writing to the journal. Also, try_to_free_buffers() could free the buffers before gfs2_iomap_page_done() was done adding the buffers to the current current transaction. With this change, gfs2_iomap_page_done() adds the buffers to the current transaction while the folio is still locked, so the problems described above can no longer occur. The only current user of ->page_done() is gfs2, so other filesystems are not affected. To catch out any out-of-tree users, switch from a page to a folio in ->page_done(). Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Darrick J. Wong <djwong@kernel.org> |
||
|
Andreas Gruenbacher
|
7a70a5085e |
iomap: Add __iomap_put_folio helper
Add an __iomap_put_folio() helper to encapsulate unlocking the folio, calling ->page_done(), and putting the folio. Use the new helper in iomap_write_begin() and iomap_write_end(). This effectively doesn't change the way the code works, but prepares for successive improvements. Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Darrick J. Wong <djwong@kernel.org> |
||
|
Linus Torvalds
|
87be949912 |
New XFS code for 6.2:
- Fix a race condition w.r.t. percpu inode free counters
- Fix a broken error return in xfs_remove
- Print FS UUID at mount/unmount time
- Numerous fixes to the online fsck code
- Fix inode locking inconsistency problems when dealing with realtime
metadata files
- Actually merge pull requests so that we capture the cover letter
contents
- Fix a race between rebuilding VFS inode state and the AIL flushing
inodes that could cause corrupt inodes to be written to the
filesystem
- Fix a data corruption problem resulting from a write() to an
unwritten extent racing with writeback started on behalf of memory
reclaim changing the extent state
- Add debugging knobs so that we can test iomap invalidation
- Fix the blockdev pagecache contents being stale after unmounting the
filesystem, leading to spurious xfs_db errors and corrupt metadumps
- Fix a file mapping corruption bug due to ilock cycling when attaching
dquots to a file during delalloc reservation
- Fix a refcount btree corruption problem due to the refcount
adjustment code not handling MAXREFCOUNT correctly, resulting in
unnecessary record splits
- Fix COW staging extent alloctions not being classified as USERDATA,
which results in filestreams being ignored and possible data
corruption if the allocation was filled from the AGFL and the block
buffer is still being tracked in the AIL
- Fix new duplicated includes
- Fix a race between the dquot shrinker and dquot freeing that could
cause a UAF
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Merge tag 'xfs-6.2-merge-8' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux
Pull XFS updates from Darrick Wong:
"The highlight of this is a batch of fixes for the online metadata
checking code as we start the loooong march towards merging online
repair. I aim to merge that in time for the 2023 LTS.
There are also a large number of data corruption and race condition
fixes in this patchset. Most notably fixed are write() calls to
unwritten extents racing with writeback, which required some late(r
than I prefer) code changes to iomap to support the necessary
revalidations. I don't really like iomap changes going in past -rc4,
but Dave and I have been working on it long enough that I chose to
push it for 6.2 anyway.
There are also a number of other subtle problems fixed, including the
log racing with inode writeback to write inodes with incorrect link
count to disk; file data mapping corruptions as a result of incorrect
lock cycling when attaching dquots; refcount metadata corruption if
one actually manages to share a block 2^32 times; and the log
clobbering cow staging extents if they were formerly metadata blocks.
Summary:
- Fix a race condition w.r.t. percpu inode free counters
- Fix a broken error return in xfs_remove
- Print FS UUID at mount/unmount time
- Numerous fixes to the online fsck code
- Fix inode locking inconsistency problems when dealing with realtime
metadata files
- Actually merge pull requests so that we capture the cover letter
contents
- Fix a race between rebuilding VFS inode state and the AIL flushing
inodes that could cause corrupt inodes to be written to the
filesystem
- Fix a data corruption problem resulting from a write() to an
unwritten extent racing with writeback started on behalf of memory
reclaim changing the extent state
- Add debugging knobs so that we can test iomap invalidation
- Fix the blockdev pagecache contents being stale after unmounting
the filesystem, leading to spurious xfs_db errors and corrupt
metadumps
- Fix a file mapping corruption bug due to ilock cycling when
attaching dquots to a file during delalloc reservation
- Fix a refcount btree corruption problem due to the refcount
adjustment code not handling MAXREFCOUNT correctly, resulting in
unnecessary record splits
- Fix COW staging extent alloctions not being classified as USERDATA,
which results in filestreams being ignored and possible data
corruption if the allocation was filled from the AGFL and the block
buffer is still being tracked in the AIL
- Fix new duplicated includes
- Fix a race between the dquot shrinker and dquot freeing that could
cause a UAF"
* tag 'xfs-6.2-merge-8' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux: (50 commits)
xfs: dquot shrinker doesn't check for XFS_DQFLAG_FREEING
xfs: Remove duplicated include in xfs_iomap.c
xfs: invalidate xfs_bufs when allocating cow extents
xfs: get rid of assert from xfs_btree_islastblock
xfs: estimate post-merge refcounts correctly
xfs: hoist refcount record merge predicates
xfs: fix super block buf log item UAF during force shutdown
xfs: wait iclog complete before tearing down AIL
xfs: attach dquots to inode before reading data/cow fork mappings
xfs: shut up -Wuninitialized in xfsaild_push
xfs: use memcpy, not strncpy, to format the attr prefix during listxattr
xfs: invalidate block device page cache during unmount
xfs: add debug knob to slow down write for fun
xfs: add debug knob to slow down writeback for fun
xfs: drop write error injection is unfixable, remove it
xfs: use iomap_valid method to detect stale cached iomaps
iomap: write iomap validity checks
xfs: xfs_bmap_punch_delalloc_range() should take a byte range
iomap: buffered write failure should not truncate the page cache
xfs,iomap: move delalloc punching to iomap
...
|
||
Dave Chinner
|
d7b6404116 |
iomap: write iomap validity checks
A recent multithreaded write data corruption has been uncovered in
the iomap write code. The core of the problem is partial folio
writes can be flushed to disk while a new racing write can map it
and fill the rest of the page:
writeback new write
allocate blocks
blocks are unwritten
submit IO
.....
map blocks
iomap indicates UNWRITTEN range
loop {
lock folio
copyin data
.....
IO completes
runs unwritten extent conv
blocks are marked written
<iomap now stale>
get next folio
}
Now add memory pressure such that memory reclaim evicts the
partially written folio that has already been written to disk.
When the new write finally gets to the last partial page of the new
write, it does not find it in cache, so it instantiates a new page,
sees the iomap is unwritten, and zeros the part of the page that
it does not have data from. This overwrites the data on disk that
was originally written.
The full description of the corruption mechanism can be found here:
https://lore.kernel.org/linux-xfs/20220817093627.GZ3600936@dread.disaster.area/
To solve this problem, we need to check whether the iomap is still
valid after we lock each folio during the write. We have to do it
after we lock the page so that we don't end up with state changes
occurring while we wait for the folio to be locked.
Hence we need a mechanism to be able to check that the cached iomap
is still valid (similar to what we already do in buffered
writeback), and we need a way for ->begin_write to back out and
tell the high level iomap iterator that we need to remap the
remaining write range.
The iomap needs to grow some storage for the validity cookie that
the filesystem provides to travel with the iomap. XFS, in
particular, also needs to know some more information about what the
iomap maps (attribute extents rather than file data extents) to for
the validity cookie to cover all the types of iomaps we might need
to validate.
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
|
||
|
Dave Chinner
|
f43dc4dc3e |
iomap: buffered write failure should not truncate the page cache
iomap_file_buffered_write_punch_delalloc() currently invalidates the page cache over the unused range of the delalloc extent that was allocated. While the write allocated the delalloc extent, it does not own it exclusively as the write does not hold any locks that prevent either writeback or mmap page faults from changing the state of either the page cache or the extent state backing this range. Whilst xfs_bmap_punch_delalloc_range() already handles races in extent conversion - it will only punch out delalloc extents and it ignores any other type of extent - the page cache truncate does not discriminate between data written by this write or some other task. As a result, truncating the page cache can result in data corruption if the write races with mmap modifications to the file over the same range. generic/346 exercises this workload, and if we randomly fail writes (as will happen when iomap gets stale iomap detection later in the patchset), it will randomly corrupt the file data because it removes data written by mmap() in the same page as the write() that failed. Hence we do not want to punch out the page cache over the range of the extent we failed to write to - what we actually need to do is detect the ranges that have dirty data in cache over them and *not punch them out*. To do this, we have to walk the page cache over the range of the delalloc extent we want to remove. This is made complex by the fact we have to handle partially up-to-date folios correctly and this can happen even when the FSB size == PAGE_SIZE because we now support multi-page folios in the page cache. Because we are only interested in discovering the edges of data ranges in the page cache (i.e. hole-data boundaries) we can make use of mapping_seek_hole_data() to find those transitions in the page cache. As we hold the invalidate_lock, we know that the boundaries are not going to change while we walk the range. This interface is also byte-based and is sub-page block aware, so we can find the data ranges in the cache based on byte offsets rather than page, folio or fs block sized chunks. This greatly simplifies the logic of finding dirty cached ranges in the page cache. Once we've identified a range that contains cached data, we can then iterate the range folio by folio. This allows us to determine if the data is dirty and hence perform the correct delalloc extent punching operations. The seek interface we use to iterate data ranges will give us sub-folio start/end granularity, so we may end up looking up the same folio multiple times as the seek interface iterates across each discontiguous data region in the folio. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Darrick J. Wong <djwong@kernel.org> |
||
|
Dave Chinner
|
9c7babf94a |
xfs,iomap: move delalloc punching to iomap
Because that's what Christoph wants for this error handling path only XFS uses. It requires a new iomap export for handling errors over delalloc ranges. This is basically the XFS code as is stands, but even though Christoph wants this as iomap funcitonality, we still have to call it from the filesystem specific ->iomap_end callback, and call into the iomap code with yet another filesystem specific callback to punch the delalloc extent within the defined ranges. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Darrick J. Wong <djwong@kernel.org> |
||
Keith Busch
|
f1bd37a473 |
iomap: directly use logical block size
Don't transform the logical block size to a bit shift only to shift it back to the original block size. Just use the size. Cc: Christoph Hellwig <hch@lst.de> Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: Keith Busch <kbusch@kernel.org> Signed-off-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org> Reviewed-by: Christoph Hellwig <hch@lst.de> |
||
Darrick J. Wong
|
adc9c2e5a7 |
iomap: add a tracepoint for mappings returned by map_blocks
Add a new tracepoint so we can see what mapping the filesystem returns to writeback a dirty page. Signed-off-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Dave Chinner <dchinner@redhat.com> |
||
|
Darrick J. Wong
|
3d5f3ba1ac |
iomap: iomap: fix memory corruption when recording errors during writeback
Every now and then I see this crash on arm64: Unable to handle kernel NULL pointer dereference at virtual address 00000000000000f8 Buffer I/O error on dev dm-0, logical block 8733687, async page read Mem abort info: ESR = 0x0000000096000006 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x06: level 2 translation fault Data abort info: ISV = 0, ISS = 0x00000006 CM = 0, WnR = 0 user pgtable: 64k pages, 42-bit VAs, pgdp=0000000139750000 [00000000000000f8] pgd=0000000000000000, p4d=0000000000000000, pud=0000000000000000, pmd=0000000000000000 Internal error: Oops: 96000006 [#1] PREEMPT SMP Buffer I/O error on dev dm-0, logical block 8733688, async page read Dumping ftrace buffer: Buffer I/O error on dev dm-0, logical block 8733689, async page read (ftrace buffer empty) XFS (dm-0): log I/O error -5 Modules linked in: dm_thin_pool dm_persistent_data XFS (dm-0): Metadata I/O Error (0x1) detected at xfs_trans_read_buf_map+0x1ec/0x590 [xfs] (fs/xfs/xfs_trans_buf.c:296). dm_bio_prison XFS (dm-0): Please unmount the filesystem and rectify the problem(s) XFS (dm-0): xfs_imap_lookup: xfs_ialloc_read_agi() returned error -5, agno 0 dm_bufio dm_log_writes xfs nft_chain_nat xt_REDIRECT nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip6t_REJECT potentially unexpected fatal signal 6. nf_reject_ipv6 potentially unexpected fatal signal 6. ipt_REJECT nf_reject_ipv4 CPU: 1 PID: 122166 Comm: fsstress Tainted: G W 6.0.0-rc5-djwa #rc5 3004c9f1de887ebae86015f2677638ce51ee7 rpcsec_gss_krb5 auth_rpcgss xt_tcpudp ip_set_hash_ip ip_set_hash_net xt_set nft_compat ip_set_hash_mac ip_set nf_tables Hardware name: QEMU KVM Virtual Machine, BIOS 1.5.1 06/16/2021 pstate: 60001000 (nZCv daif -PAN -UAO -TCO -DIT +SSBS BTYPE=--) ip_tables pc : 000003fd6d7df200 x_tables lr : 000003fd6d7df1ec overlay nfsv4 CPU: 0 PID: 54031 Comm: u4:3 Tainted: G W 6.0.0-rc5-djwa #rc5 3004c9f1de887ebae86015f2677638ce51ee7405 Hardware name: QEMU KVM Virtual Machine, BIOS 1.5.1 06/16/2021 Workqueue: writeback wb_workfn sp : 000003ffd9522fd0 (flush-253:0) pstate: 60401005 (nZCv daif +PAN -UAO -TCO -DIT +SSBS BTYPE=--) pc : errseq_set+0x1c/0x100 x29: 000003ffd9522fd0 x28: 0000000000000023 x27: 000002acefeb6780 x26: 0000000000000005 x25: 0000000000000001 x24: 0000000000000000 x23: 00000000ffffffff x22: 0000000000000005 lr : __filemap_set_wb_err+0x24/0xe0 x21: 0000000000000006 sp : fffffe000f80f760 x29: fffffe000f80f760 x28: 0000000000000003 x27: fffffe000f80f9f8 x26: 0000000002523000 x25: 00000000fffffffb x24: fffffe000f80f868 x23: fffffe000f80fbb0 x22: fffffc0180c26a78 x21: 0000000002530000 x20: 0000000000000000 x19: 0000000000000000 x18: 0000000000000000 x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 x14: 0000000000000001 x13: 0000000000470af3 x12: fffffc0058f70000 x11: 0000000000000040 x10: 0000000000001b20 x9 : fffffe000836b288 x8 : fffffc00eb9fd480 x7 : 0000000000f83659 x6 : 0000000000000000 x5 : 0000000000000869 x4 : 0000000000000005 x3 : 00000000000000f8 x20: 000003fd6d740020 x19: 000000000001dd36 x18: 0000000000000001 x17: 000003fd6d78704c x16: 0000000000000001 x15: 000002acfac87668 x2 : 0000000000000ffa x1 : 00000000fffffffb x0 : 00000000000000f8 Call trace: errseq_set+0x1c/0x100 __filemap_set_wb_err+0x24/0xe0 iomap_do_writepage+0x5e4/0xd5c write_cache_pages+0x208/0x674 iomap_writepages+0x34/0x60 xfs_vm_writepages+0x8c/0xcc [xfs 7a861f39c43631f15d3a5884246ba5035d4ca78b] x14: 0000000000000000 x13: 2064656e72757465 x12: 0000000000002180 x11: 000003fd6d8a82d0 x10: 0000000000000000 x9 : 000003fd6d8ae288 x8 : 0000000000000083 x7 : 00000000ffffffff x6 : 00000000ffffffee x5 : 00000000fbad2887 x4 : 000003fd6d9abb58 x3 : 000003fd6d740020 x2 : 0000000000000006 x1 : 000000000001dd36 x0 : 0000000000000000 CPU: 1 PID: 122167 Comm: fsstress Tainted: G W 6.0.0-rc5-djwa #rc5 3004c9f1de887ebae86015f2677638ce51ee7 do_writepages+0x90/0x1c4 __writeback_single_inode+0x4c/0x4ac Hardware name: QEMU KVM Virtual Machine, BIOS 1.5.1 06/16/2021 writeback_sb_inodes+0x214/0x4ac wb_writeback+0xf4/0x3b0 pstate: 60001000 (nZCv daif -PAN -UAO -TCO -DIT +SSBS BTYPE=--) wb_workfn+0xfc/0x580 process_one_work+0x1e8/0x480 pc : 000003fd6d7df200 worker_thread+0x78/0x430 This crash is a result of iomap_writepage_map encountering some sort of error during writeback and wanting to set that error code in the file mapping so that fsync will report it. Unfortunately, the code dereferences folio->mapping after unlocking the folio, which means that another thread could have removed the page from the page cache (writeback doesn't hold the invalidation lock) and give it to somebody else. At best we crash the system like above; at worst, we corrupt memory or set an error on some other unsuspecting file while failing to record the problems with *this* file. Regardless, fix the problem by reporting the error to the inode mapping. NOTE: Commit |
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|
Linus Torvalds
|
8745889a7f |
New code for 6.0:
- Remove iomap_writepage and all callers, since the mm apparently never
called the zonefs or gfs2 writepage functions.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Merge tag 'iomap-6.0-merge-2' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux
Pull more iomap updates from Darrick Wong:
"In the past 10 days or so I've not heard any ZOMG STOP style
complaints about removing ->writepage support from gfs2 or zonefs, so
here's the pull request removing them (and the underlying fs iomap
support) from the kernel:
- Remove iomap_writepage and all callers, since the mm apparently
never called the zonefs or gfs2 writepage functions"
* tag 'iomap-6.0-merge-2' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
iomap: remove iomap_writepage
zonefs: remove ->writepage
gfs2: remove ->writepage
gfs2: stop using generic_writepages in gfs2_ail1_start_one
|
||
Al Viro
|
fcb14cb1bd |
new iov_iter flavour - ITER_UBUF
Equivalent of single-segment iovec. Initialized by iov_iter_ubuf(), checked for by iter_is_ubuf(), otherwise behaves like ITER_IOVEC ones. We are going to expose the things like ->write_iter() et.al. to those in subsequent commits. New predicate (user_backed_iter()) that is true for ITER_IOVEC and ITER_UBUF; places like direct-IO handling should use that for checking that pages we modify after getting them from iov_iter_get_pages() would need to be dirtied. DO NOT assume that replacing iter_is_iovec() with user_backed_iter() will solve all problems - there's code that uses iter_is_iovec() to decide how to poke around in iov_iter guts and for that the predicate replacement obviously won't suffice. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> |
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Linus Torvalds
|
f18d73096c |
New code for 5.20:
- Skip writeback for pages that are completely beyond EOF - Minor code cleanups -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEUzaAxoMeQq6m2jMV+H93GTRKtOsFAmK92MsACgkQ+H93GTRK tOuw5w//UpB7MqPpZyfqu5nIehVy9zJX8KacZHI3k82ID48fCpa/Q+KpfxHZFbMa eqSzl2wHEv/bzH6I1UCtq2aA7y6ZhpiR3LiIV2PKEy/vgYtPeVSNhkIzwuK9YYPN Wj1fLRUi4M4Y86a97vNSzdsdnHLCRnUHY2C35ywRvRCY0opUKSWGF45mD5Mj+0BK Kl6TfPlyyR0ugBxOf2cJWA/uL/YA5sHT32uViSPxyFpXufyILz8rjxzhRwdSUwFV TEoyTey4LgoADOA2X5Czxg0CIKfjM2xVnU/ybsdL/q0Mj5U1uzuJPsNY/M4pG0X8 v1/01NSSHVH37Kmr/3L15+doZDQGOLrRoWwStag2tRd6jNRNN7YctnanGoiR6elE ElU64mDVjc1FJf1J7JF5IObUJMfw0/ulHX5rHYWZlbbO1rnjD6+fVYVQbMW7xsmu o8fYiZHrkWBo5sYkWgIYhoD8fq3oMkYaryDTEtSS/Jy1tpu2gZpXzaMusKpu9qSe yc93TTnqqgS9LrSy0gJJqMzR5SavDFZvFhcgIjZXcbonz5uPwYTY7D5lD7vOLqbR b3oV3+lOQs15nhXs0RO4g1bFIIe9dqAZRlPJX1vYvgjlA3VSQWLcqtlxgpGYptf6 XT/yftI/+sVfTQSC6QAKmp7DTEtYLRKfpNSD9L52TKBvYigQPxo= =aDOK -----END PGP SIGNATURE----- Merge tag 'iomap-5.20-merge-1' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux Pull iomap updates from Darrick Wong: "The most notable change in this first batch is that we no longer schedule pages beyond i_size for writeback, preferring instead to let truncate deal with those pages. Next week, there may be a second pull request to remove iomap_writepage from the other two filesystems (gfs2/zonefs) that use iomap for buffered IO. This follows in the same vein as the recent removal of writepage from XFS, since it hasn't been triggered in a few years; it does nothing during direct reclaim; and as far as the people who examined the patchset can tell, it's moving the codebase in the right direction. However, as it was a late addition to for-next, I'm holding off on that section for another week of testing to see if anyone can come up with a solid reason for holding off in the meantime. Summary: - Skip writeback for pages that are completely beyond EOF - Minor code cleanups" * tag 'iomap-5.20-merge-1' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux: dax: set did_zero to true when zeroing successfully iomap: set did_zero to true when zeroing successfully iomap: skip pages past eof in iomap_do_writepage() |
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Linus Torvalds
|
5264406cdb |
iov_iter work, part 1 - isolated cleanups and optimizations.
One of the goals is to reduce the overhead of using ->read_iter()
and ->write_iter() instead of ->read()/->write(); new_sync_{read,write}()
has a surprising amount of overhead, in particular inside iocb_flags().
That's why the beginning of the series is in this pile; it's not directly
iov_iter-related, but it's a part of the same work...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Merge tag 'pull-work.iov_iter-base' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull vfs iov_iter updates from Al Viro:
"Part 1 - isolated cleanups and optimizations.
One of the goals is to reduce the overhead of using ->read_iter() and
->write_iter() instead of ->read()/->write().
new_sync_{read,write}() has a surprising amount of overhead, in
particular inside iocb_flags(). That's the explanation for the
beginning of the series is in this pile; it's not directly
iov_iter-related, but it's a part of the same work..."
* tag 'pull-work.iov_iter-base' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
first_iovec_segment(): just return address
iov_iter: massage calling conventions for first_{iovec,bvec}_segment()
iov_iter: first_{iovec,bvec}_segment() - simplify a bit
iov_iter: lift dealing with maxpages out of first_{iovec,bvec}_segment()
iov_iter_get_pages{,_alloc}(): cap the maxsize with MAX_RW_COUNT
iov_iter_bvec_advance(): don't bother with bvec_iter
copy_page_{to,from}_iter(): switch iovec variants to generic
keep iocb_flags() result cached in struct file
iocb: delay evaluation of IS_SYNC(...) until we want to check IOCB_DSYNC
struct file: use anonymous union member for rcuhead and llist
btrfs: use IOMAP_DIO_NOSYNC
teach iomap_dio_rw() to suppress dsync
No need of likely/unlikely on calls of check_copy_size()
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Linus Torvalds
|
f00654007f |
Folio changes for 6.0
- Fix an accounting bug that made NR_FILE_DIRTY grow without limit
when running xfstests
- Convert more of mpage to use folios
- Remove add_to_page_cache() and add_to_page_cache_locked()
- Convert find_get_pages_range() to filemap_get_folios()
- Improvements to the read_cache_page() family of functions
- Remove a few unnecessary checks of PageError
- Some straightforward filesystem conversions to use folios
- Split PageMovable users out from address_space_operations into their
own movable_operations
- Convert aops->migratepage to aops->migrate_folio
- Remove nobh support (Christoph Hellwig)
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Merge tag 'folio-6.0' of git://git.infradead.org/users/willy/pagecache
Pull folio updates from Matthew Wilcox:
- Fix an accounting bug that made NR_FILE_DIRTY grow without limit
when running xfstests
- Convert more of mpage to use folios
- Remove add_to_page_cache() and add_to_page_cache_locked()
- Convert find_get_pages_range() to filemap_get_folios()
- Improvements to the read_cache_page() family of functions
- Remove a few unnecessary checks of PageError
- Some straightforward filesystem conversions to use folios
- Split PageMovable users out from address_space_operations into
their own movable_operations
- Convert aops->migratepage to aops->migrate_folio
- Remove nobh support (Christoph Hellwig)
* tag 'folio-6.0' of git://git.infradead.org/users/willy/pagecache: (78 commits)
fs: remove the NULL get_block case in mpage_writepages
fs: don't call ->writepage from __mpage_writepage
fs: remove the nobh helpers
jfs: stop using the nobh helper
ext2: remove nobh support
ntfs3: refactor ntfs_writepages
mm/folio-compat: Remove migration compatibility functions
fs: Remove aops->migratepage()
secretmem: Convert to migrate_folio
hugetlb: Convert to migrate_folio
aio: Convert to migrate_folio
f2fs: Convert to filemap_migrate_folio()
ubifs: Convert to filemap_migrate_folio()
btrfs: Convert btrfs_migratepage to migrate_folio
mm/migrate: Add filemap_migrate_folio()
mm/migrate: Convert migrate_page() to migrate_folio()
nfs: Convert to migrate_folio
btrfs: Convert btree_migratepage to migrate_folio
mm/migrate: Convert expected_page_refs() to folio_expected_refs()
mm/migrate: Convert buffer_migrate_page() to buffer_migrate_folio()
...
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Linus Torvalds
|
c013d0af81 |
for-5.20/block-2022-07-29
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Matthew Wilcox (Oracle)
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2ec810d596 |
mm/migrate: Add filemap_migrate_folio()
There is nothing iomap-specific about iomap_migratepage(), and it fits a pattern used by several other filesystems, so move it to mm/migrate.c, convert it to be filemap_migrate_folio() and convert the iomap filesystems to use it. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Darrick J. Wong <djwong@kernel.org> |
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Stefan Roesch
|
18e419f6e8 |
iomap: Return -EAGAIN from iomap_write_iter()
If iomap_write_iter() encounters -EAGAIN, return -EAGAIN to the caller. Signed-off-by: Stefan Roesch <shr@fb.com> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Link: https://lore.kernel.org/r/20220623175157.1715274-7-shr@fb.com Reviewed-by: Christoph Hellwig <hch@lst.de> [axboe: make the suggested ternary edit] Signed-off-by: Jens Axboe <axboe@kernel.dk> |
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Stefan Roesch
|
cae2de6978 |
iomap: Add async buffered write support
This adds async buffered write support to iomap. This replaces the call to balance_dirty_pages_ratelimited() with the call to balance_dirty_pages_ratelimited_flags. This allows to specify if the write request is async or not. In addition this also moves the above function call to the beginning of the function. If the function call is at the end of the function and the decision is made to throttle writes, then there is no request that io-uring can wait on. By moving it to the beginning of the function, the write request is not issued, but returns -EAGAIN instead. io-uring will punt the request and process it in the io-worker. By moving the function call to the beginning of the function, the write throttling will happen one page later. Signed-off-by: Stefan Roesch <shr@fb.com> Reviewed-by: Jan Kara <jack@suse.cz> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Link: https://lore.kernel.org/r/20220623175157.1715274-6-shr@fb.com Signed-off-by: Jens Axboe <axboe@kernel.dk> |
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Stefan Roesch
|
9753b868fd |
iomap: Add flags parameter to iomap_page_create()
Add the kiocb flags parameter to the function iomap_page_create(). Depending on the value of the flags parameter it enables different gfp flags. No intended functional changes in this patch. Signed-off-by: Stefan Roesch <shr@fb.com> Reviewed-by: Jan Kara <jack@suse.cz> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Link: https://lore.kernel.org/r/20220623175157.1715274-5-shr@fb.com Signed-off-by: Jens Axboe <axboe@kernel.dk> |
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Christoph Hellwig
|
478af190cb |
iomap: remove iomap_writepage
Unused now. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com> Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Signed-off-by: Darrick J. Wong <djwong@kernel.org> |
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Bart Van Assche
|
dbd4eb8148 |
fs/iomap: Use the new blk_opf_t type
Improve static type checking by using the enum req_op type for variables that represent a request operation and the new blk_opf_t type for the combination of a request operation and request flags. Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Bart Van Assche <bvanassche@acm.org> Link: https://lore.kernel.org/r/20220714180729.1065367-56-bvanassche@acm.org Signed-off-by: Jens Axboe <axboe@kernel.dk> |
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Kaixu Xia
|
98eb8d9502 |
iomap: set did_zero to true when zeroing successfully
It is unnecessary to check and set did_zero value in while() loop in iomap_zero_iter(), we can set did_zero to true only when zeroing successfully at last. Signed-off-by: Kaixu Xia <kaixuxia@tencent.com> Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Signed-off-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de> |
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Chris Mason
|
d58562ca6c |
iomap: skip pages past eof in iomap_do_writepage()
iomap_do_writepage() sends pages past i_size through
folio_redirty_for_writepage(), which normally isn't a problem because
truncate and friends clean them very quickly.
When the system has cgroups configured, we can end up in situations
where one cgroup has almost no dirty pages at all, and other cgroups
consume the entire background dirty limit. This is especially common in
our XFS workloads in production because they have cgroups using O_DIRECT
for almost all of the IO mixed in with cgroups that do more traditional
buffered IO work.
We've hit storms where the redirty path hits millions of times in a few
seconds, on all a single file that's only ~40 pages long. This leads to
long tail latencies for file writes because the pdflush workers are
hogging the CPU from some kworkers bound to the same CPU.
Reproducing this on 5.18 was tricky because
|
||
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Matthew Wilcox (Oracle)
|
ba9863127c |
iomap: Remove test for folio error
Just because there has been a read error doesn't mean we should avoid marking this part of the folio as uptodate. Indeed, it may overwrite the error part of the folio and let us mark the entire folio uptodate. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> |
||
|
Keith Busch
|
bf8d08532b |
iomap: add support for dma aligned direct-io
Use the address alignment requirements from the block_device for direct io instead of requiring addresses be aligned to the block size. Signed-off-by: Keith Busch <kbusch@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20220610195830.3574005-12-kbusch@fb.com Signed-off-by: Jens Axboe <axboe@kernel.dk> |
||
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Al Viro
|
91b94c5d6a |
iocb: delay evaluation of IS_SYNC(...) until we want to check IOCB_DSYNC
New helper to be used instead of direct checks for IOCB_DSYNC: iocb_is_dsync(iocb). Checks converted, which allows to avoid the IS_SYNC(iocb->ki_filp->f_mapping->host) part (4 cache lines) from iocb_flags() - it's checked in iocb_is_dsync() instead Reviewed-by: Christian Brauner (Microsoft) <brauner@kernel.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> |
||
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Al Viro
|
36518b6b4d |
teach iomap_dio_rw() to suppress dsync
New flag, equivalent to removal of IOCB_DSYNC from iocb flags. This mimics what btrfs is doing (and that's what btrfs will switch to). However, I'm not at all sure that we want to suppress REQ_FUA for those - all btrfs hack really cares about is suppression of generic_write_sync(). For now let's keep the existing behaviour, but I really want to hear more detailed arguments pro or contra. [folded brain fix from willy] Suggested-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Christian Brauner (Microsoft) <brauner@kernel.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> |
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Linus Torvalds
|
fdaf9a5840 |
Page cache changes for 5.19
- Appoint myself page cache maintainer
- Fix how scsicam uses the page cache
- Use the memalloc_nofs_save() API to replace AOP_FLAG_NOFS
- Remove the AOP flags entirely
- Remove pagecache_write_begin() and pagecache_write_end()
- Documentation updates
- Convert several address_space operations to use folios:
- is_dirty_writeback
- readpage becomes read_folio
- releasepage becomes release_folio
- freepage becomes free_folio
- Change filler_t to require a struct file pointer be the first argument
like ->read_folio
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Merge tag 'folio-5.19' of git://git.infradead.org/users/willy/pagecache
Pull page cache updates from Matthew Wilcox:
- Appoint myself page cache maintainer
- Fix how scsicam uses the page cache
- Use the memalloc_nofs_save() API to replace AOP_FLAG_NOFS
- Remove the AOP flags entirely
- Remove pagecache_write_begin() and pagecache_write_end()
- Documentation updates
- Convert several address_space operations to use folios:
- is_dirty_writeback
- readpage becomes read_folio
- releasepage becomes release_folio
- freepage becomes free_folio
- Change filler_t to require a struct file pointer be the first
argument like ->read_folio
* tag 'folio-5.19' of git://git.infradead.org/users/willy/pagecache: (107 commits)
nilfs2: Fix some kernel-doc comments
Appoint myself page cache maintainer
fs: Remove aops->freepage
secretmem: Convert to free_folio
nfs: Convert to free_folio
orangefs: Convert to free_folio
fs: Add free_folio address space operation
fs: Convert drop_buffers() to use a folio
fs: Change try_to_free_buffers() to take a folio
jbd2: Convert release_buffer_page() to use a folio
jbd2: Convert jbd2_journal_try_to_free_buffers to take a folio
reiserfs: Convert release_buffer_page() to use a folio
fs: Remove last vestiges of releasepage
ubifs: Convert to release_folio
reiserfs: Convert to release_folio
orangefs: Convert to release_folio
ocfs2: Convert to release_folio
nilfs2: Remove comment about releasepage
nfs: Convert to release_folio
jfs: Convert to release_folio
...
|
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Linus Torvalds
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8642174b52 |
New code for 5.19:
- Fix a couple of accounting errors in the buffered io code.
- Discontinue the practice of marking folios !uptodate and invalidating
them when writeback fails. This fixes some UAF bugs when multipage
folios are enabled, and brings the behavior of XFS/gfs/zonefs into
alignment with the behavior of all the other Linux filesystems.
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Merge tag 'iomap-5.19-merge-2' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux
Pull iomap updates from Darrick Wong:
"There's a couple of corrections sent in by Andreas for some accounting
errors.
The biggest change this time around is that writeback errors longer
clear pageuptodate nor does XFS invalidate the page cache anymore.
This brings XFS (and gfs2/zonefs) behavior in line with every other
Linux filesystem driver, and fixes some UAF bugs that only cropped up
after willy turned on multipage folios for XFS in 5.18-rc1.
Regrettably, it took all the way to the end of the 5.18 cycle to find
the source of these bugs and reach a consensus that XFS' writeback
failure behavior from 20 years ago is no longer necessary.
Summary:
- Fix a couple of accounting errors in the buffered io code.
- Discontinue the practice of marking folios !uptodate and
invalidating them when writeback fails.
This fixes some UAF bugs when multipage folios are enabled, and
brings the behavior of XFS/gfs/zonefs into alignment with the
behavior of all the other Linux filesystems"
* tag 'iomap-5.19-merge-2' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
iomap: don't invalidate folios after writeback errors
iomap: iomap_write_end cleanup
iomap: iomap_write_failed fix
|
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Linus Torvalds
|
bd1b7c1384 |
for-5.19-tag
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Merge tag 'for-5.19-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux
Pull btrfs updates from David Sterba:
"Features:
- subpage:
- support for PAGE_SIZE > 4K (previously only 64K)
- make it work with raid56
- repair super block num_devices automatically if it does not match
the number of device items
- defrag can convert inline extents to regular extents, up to now
inline files were skipped but the setting of mount option
max_inline could affect the decision logic
- zoned:
- minimal accepted zone size is explicitly set to 4MiB
- make zone reclaim less aggressive and don't reclaim if there are
enough free zones
- add per-profile sysfs tunable of the reclaim threshold
- allow automatic block group reclaim for non-zoned filesystems, with
sysfs tunables
- tree-checker: new check, compare extent buffer owner against owner
rootid
Performance:
- avoid blocking on space reservation when doing nowait direct io
writes (+7% throughput for reads and writes)
- NOCOW write throughput improvement due to refined locking (+3%)
- send: reduce pressure to page cache by dropping extent pages right
after they're processed
Core:
- convert all radix trees to xarray
- add iterators for b-tree node items
- support printk message index
- user bulk page allocation for extent buffers
- switch to bio_alloc API, use on-stack bios where convenient, other
bio cleanups
- use rw lock for block groups to favor concurrent reads
- simplify workques, don't allocate high priority threads for all
normal queues as we need only one
- refactor scrub, process chunks based on their constraints and
similarity
- allocate direct io structures on stack and pass around only
pointers, avoids allocation and reduces potential error handling
Fixes:
- fix count of reserved transaction items for various inode
operations
- fix deadlock between concurrent dio writes when low on free data
space
- fix a few cases when zones need to be finished
VFS, iomap:
- add helper to check if sb write has started (usable for assertions)
- new helper iomap_dio_alloc_bio, export iomap_dio_bio_end_io"
* tag 'for-5.19-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux: (173 commits)
btrfs: zoned: introduce a minimal zone size 4M and reject mount
btrfs: allow defrag to convert inline extents to regular extents
btrfs: add "0x" prefix for unsupported optional features
btrfs: do not account twice for inode ref when reserving metadata units
btrfs: zoned: fix comparison of alloc_offset vs meta_write_pointer
btrfs: send: avoid trashing the page cache
btrfs: send: keep the current inode open while processing it
btrfs: allocate the btrfs_dio_private as part of the iomap dio bio
btrfs: move struct btrfs_dio_private to inode.c
btrfs: remove the disk_bytenr in struct btrfs_dio_private
btrfs: allocate dio_data on stack
iomap: add per-iomap_iter private data
iomap: allow the file system to provide a bio_set for direct I/O
btrfs: add a btrfs_dio_rw wrapper
btrfs: zoned: zone finish unused block group
btrfs: zoned: properly finish block group on metadata write
btrfs: zoned: finish block group when there are no more allocatable bytes left
btrfs: zoned: consolidate zone finish functions
btrfs: zoned: introduce btrfs_zoned_bg_is_full
btrfs: improve error reporting in lookup_inline_extent_backref
...
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Darrick J. Wong
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e9c3a8e820 |
iomap: don't invalidate folios after writeback errors
XFS has the unique behavior (as compared to the other Linux filesystems) that on writeback errors it will completely invalidate the affected folio and force the page cache to reread the contents from disk. All other filesystems leave the page mapped and up to date. This is a rude awakening for user programs, since (in the case where write fails but reread doesn't) file contents will appear to revert to old disk contents with no notification other than an EIO on fsync. This might have been annoying back in the days when iomap dealt with one page at a time, but with multipage folios, we can now throw away *megabytes* worth of data for a single write error. On *most* Linux filesystems, a program can respond to an EIO on write by redirtying the entire file and scheduling it for writeback. This isn't foolproof, since the page that failed writeback is no longer dirty and could be evicted, but programs that want to recover properly *also* have to detect XFS and regenerate every write they've made to the file. When running xfs/314 on arm64, I noticed a UAF when xfs_discard_folio invalidates multipage folios that could be undergoing writeback. If, say, we have a 256K folio caching a mix of written and unwritten extents, it's possible that we could start writeback of the first (say) 64K of the folio and then hit a writeback error on the next 64K. We then free the iop attached to the folio, which is really bad because writeback completion on the first 64k will trip over the "blocks per folio > 1 && !iop" assertion. This can't be fixed by only invalidating the folio if writeback fails at the start of the folio, since the folio is marked !uptodate, which trips other assertions elsewhere. Get rid of the whole behavior entirely. Signed-off-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org> Reviewed-by: Jeff Layton <jlayton@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de> |
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Christoph Hellwig
|
786f847f43 |
iomap: add per-iomap_iter private data
Allow the file system to keep state for all iterations. For now only wire it up for direct I/O as there is an immediate need for it there. Reviewed-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> |
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Christoph Hellwig
|
908c54909a |
iomap: allow the file system to provide a bio_set for direct I/O
Allow the file system to provide a specific bio_set for allocating direct I/O bios. This will allow file systems that use the ->submit_io hook to stash away additional information for file system use. To make use of this additional space for information in the completion path, the file system needs to override the ->bi_end_io callback and then call back into iomap, so export iomap_dio_bio_end_io for that. Reviewed-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> |
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Matthew Wilcox (Oracle)
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8597447dc5 |
iomap: Convert to release_folio
Change all the filesystems which used iomap_releasepage to use the new function. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Reviewed-by: Jeff Layton <jlayton@kernel.org> |