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Tejun Heo f1a2fe8419 writeback: synchronize sync(2) against cgroup writeback membership switches 
commit 7fc5854f8c6efae9e7624970ab49a1eac2faefb1 upstream.

sync_inodes_sb() can race against cgwb (cgroup writeback) membership
switches and fail to writeback some inodes.  For example, if an inode
switches to another wb while sync_inodes_sb() is in progress, the new
wb might not be visible to bdi_split_work_to_wbs() at all or the inode
might jump from a wb which hasn't issued writebacks yet to one which
already has.

This patch adds backing_dev_info->wb_switch_rwsem to synchronize cgwb
switch path against sync_inodes_sb() so that sync_inodes_sb() is
guaranteed to see all the target wbs and inodes can't jump wbs to
escape syncing.

v2: Fixed misplaced rwsem init.  Spotted by Jiufei.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Jiufei Xue <xuejiufei@gmail.com>
Link: http://lkml.kernel.org/r/dc694ae2-f07f-61e1-7097-7c8411cee12d@gmail.com
Acked-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-04-06 18:12:57 +02:00
..
kasan A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
backing-dev.c writeback: synchronize sync(2) against cgroup writeback membership switches 2020-04-06 18:12:57 +02:00
balloon_compaction.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
bootmem.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
cleancache.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
cma_debug.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
cma.c mm/cma.c: cma_declare_contiguous: correct err handling 2020-04-06 14:22:51 +02:00
cma.h A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
compaction.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
debug-pagealloc.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
debug.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
dmapool.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
early_ioremap.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
fadvise.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
failslab.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
filemap.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
frame_vector.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
frontswap.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
gup.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
highmem.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
hpa.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
huge_memory.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
hugetlb_cgroup.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
hugetlb.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
hwpoison-inject.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
init-mm.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
internal.h A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
interval_tree.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
io_record.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
Kconfig A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
Kconfig.debug A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
kmemcheck.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
kmemleak-test.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
kmemleak.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
ksm.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
list_lru.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
maccess.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
madvise.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
Makefile A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
memblock.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
memcontrol.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
memory_hotplug.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
memory-failure.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
memory.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
mempolicy.c mm: mempolicy: make mbind() return -EIO when MPOL_MF_STRICT is specified 2020-04-06 13:43:53 +02:00
mempool.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
memtest.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
migrate.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
mincore.c mm/mincore.c: make mincore() more conservative 2020-04-06 18:12:28 +02:00
mlock.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
mm_init.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
mmap.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
mmu_context.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
mmu_notifier.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
mmzone.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
mprotect.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
mremap.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
msync.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
nobootmem.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
nommu.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
oom_kill.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
page_alloc.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
page_counter.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
page_ext.c mm/page_ext.c: fix an imbalance with kmemleak 2020-04-06 14:22:59 +02:00
page_idle.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
page_io.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
page_isolation.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
page_owner.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
page-writeback.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
pagewalk.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
percpu-km.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
percpu-vm.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
percpu.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
pgtable-generic.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
process_vm_access.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
quicklist.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
readahead.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
rmap.c mm/rmap: replace BUG_ON(anon_vma->degree) with VM_WARN_ON 2020-04-06 11:16:40 +02:00
shmem.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
showmem_extra.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
slab_common.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
slab.c mm/slab.c: kmemleak no scan alien caches 2020-04-06 14:23:23 +02:00
slab.h A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
slob.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
slub.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
sparse-vmemmap.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
sparse.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
swap_cgroup.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
swap_state.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
swap.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
swapfile.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
truncate.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
usercopy.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
userfaultfd.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
util.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
vmacache.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
vmalloc.c mm/vmalloc.c: fix kernel BUG at mm/vmalloc.c:512! 2020-04-06 14:23:12 +02:00
vmpressure.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
vmscan.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
vmstat.c mm/vmstat.c: fix /proc/vmstat format for CONFIG_DEBUG_TLBFLUSH=y CONFIG_SMP=n 2020-04-06 15:57:15 +02:00
workingset.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
zbud.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
zpool.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
zsmalloc.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
zswap.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30