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Xiaoguang Wang 65a6543da3 io_uring: fix io_kiocb.flags modification race in IOPOLL mode 
While testing io_uring in arm, we found sometimes io_sq_thread() keeps
polling io requests even though there are not inflight io requests in
block layer. After some investigations, found a possible race about
io_kiocb.flags, see below race codes:
  1) in the end of io_write() or io_read()
    req->flags &= ~REQ_F_NEED_CLEANUP;
    kfree(iovec);
    return ret;

  2) in io_complete_rw_iopoll()
    if (res != -EAGAIN)
        req->flags |= REQ_F_IOPOLL_COMPLETED;

In IOPOLL mode, io requests still maybe completed by interrupt, then
above codes are not safe, concurrent modifications to req->flags, which
is not protected by lock or is not atomic modifications. I also had
disassemble io_complete_rw_iopoll() in arm:
   req->flags |= REQ_F_IOPOLL_COMPLETED;
   0xffff000008387b18 <+76>:    ldr     w0, [x19,#104]
   0xffff000008387b1c <+80>:    orr     w0, w0, #0x1000
   0xffff000008387b20 <+84>:    str     w0, [x19,#104]

Seems that the "req->flags |= REQ_F_IOPOLL_COMPLETED;" is  load and
modification, two instructions, which obviously is not atomic.

To fix this issue, add a new iopoll_completed in io_kiocb to indicate
whether io request is completed.

Signed-off-by: Xiaoguang Wang <xiaoguang.wang@linux.alibaba.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-06-11 09:45:21 -06:00
..
9p 9p: read only once on O_NONBLOCK 2020-03-27 09:29:56 +00:00
adfs docs: filesystems: fix renamed references 2020-04-20 15:45:22 -06:00
affs docs: filesystems: fix renamed references 2020-04-20 15:45:22 -06:00
afs A fair amount of stuff this time around, dominated by yet another massive 2020-06-01 15:45:27 -07:00
autofs LOOKUP_MOUNTPOINT: fold path_mountpointat() into path_lookupat() 2020-03-13 21:08:17 -04:00
befs
bfs docs: filesystems: fix renamed references 2020-04-20 15:45:22 -06:00
btrfs Merge branch 'akpm' (patches from Andrew) 2020-06-02 12:21:36 -07:00
cachefiles A fair amount of stuff this time around, dominated by yet another massive 2020-06-01 15:45:27 -07:00
ceph ceph: flush release queue when handling caps for unknown inode 2020-05-27 13:03:57 +02:00
cifs cifs: fix leaked reference on requeued write 2020-05-14 17:47:01 -05:00
coda docs: filesystems: convert coda.txt to ReST 2020-05-05 09:22:21 -06:00
configfs A fair amount of stuff this time around, dominated by yet another massive 2020-06-01 15:45:27 -07:00
cramfs docs: filesystems: fix renamed references 2020-04-20 15:45:22 -06:00
crypto fscrypt updates for 5.8 2020-06-01 12:10:17 -07:00
debugfs debugfs: remove return value of debugfs_create_u32() 2020-04-17 17:08:50 +02:00
devpts
dlm
ecryptfs A fair amount of stuff this time around, dominated by yet another massive 2020-06-01 15:45:27 -07:00
efivarfs
efs
erofs mm: remove the prot argument from vm_map_ram 2020-06-02 10:59:11 -07:00
exfat fs: convert mpage_readpages to mpage_readahead 2020-06-02 10:59:07 -07:00
exportfs
ext2 fs: convert mpage_readpages to mpage_readahead 2020-06-02 10:59:07 -07:00
ext4 for-5.8/block-2020-06-01 2020-06-02 15:29:19 -07:00
f2fs f2fs: use attach/detach_page_private 2020-06-02 10:59:07 -07:00
fat for-5.8/block-2020-06-01 2020-06-02 15:29:19 -07:00
freevxfs
fscache docs: filesystems: caching/backend-api.txt: convert it to ReST 2020-05-05 09:22:21 -06:00
fuse Merge branch 'akpm' (patches from Andrew) 2020-06-02 12:21:36 -07:00
gfs2 mm: remove the pgprot argument to __vmalloc 2020-06-02 10:59:11 -07:00
hfs for-5.8/block-2020-06-01 2020-06-02 15:29:19 -07:00
hfsplus block: remove the error_sector argument to blkdev_issue_flush 2020-05-22 08:45:46 -06:00
hostfs hostfs: Use kasprintf() instead of fixed buffer formatting 2020-03-29 23:23:00 +02:00
hpfs Merge branch 'akpm' (patches from Andrew) 2020-06-02 12:21:36 -07:00
hugetlbfs hugetlbfs: Use i_mmap_rwsem to address page fault/truncate race 2020-04-02 09:35:32 -07:00
iomap for-5.8/block-2020-06-01 2020-06-02 15:29:19 -07:00
isofs for-5.8/block-2020-06-01 2020-06-02 15:29:19 -07:00
jbd2 block: remove the error_sector argument to blkdev_issue_flush 2020-05-22 08:45:46 -06:00
jffs2
jfs fs: convert mpage_readpages to mpage_readahead 2020-06-02 10:59:07 -07:00
kernfs kernfs: Add option to enable user xattrs 2020-03-16 15:53:47 -04:00
lockd
minix
nfs mm: remove the pgprot argument to __vmalloc 2020-06-02 10:59:11 -07:00
nfs_common
nfsd mm/writeback: replace PF_LESS_THROTTLE with PF_LOCAL_THROTTLE 2020-06-02 10:59:08 -07:00
nilfs2 for-5.8/block-2020-06-01 2020-06-02 15:29:19 -07:00
nls
notify A fair amount of stuff this time around, dominated by yet another massive 2020-06-01 15:45:27 -07:00
ntfs Merge branch 'akpm' (patches from Andrew) 2020-06-02 12:21:36 -07:00
ocfs2 for-5.8/block-2020-06-01 2020-06-02 15:29:19 -07:00
omfs fs: convert mpage_readpages to mpage_readahead 2020-06-02 10:59:07 -07:00
openpromfs
orangefs orangefs: use attach/detach_page_private 2020-06-02 10:59:08 -07:00
overlayfs A fair amount of stuff this time around, dominated by yet another massive 2020-06-01 15:45:27 -07:00
proc Merge branch 'akpm' (patches from Andrew) 2020-06-02 12:21:36 -07:00
pstore Merge branch 'uaccess.__copy_from_user' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-06-01 16:18:46 -07:00
qnx4
qnx6 fs: convert mpage_readpages to mpage_readahead 2020-06-02 10:59:07 -07:00
quota
ramfs
reiserfs for-5.8/block-2020-06-01 2020-06-02 15:29:19 -07:00
romfs docs: filesystems: fix renamed references 2020-04-20 15:45:22 -06:00
squashfs Merge branch 'akpm' (patches from Andrew) 2020-06-02 12:21:36 -07:00
sysfs docs: filesystems: fix renamed references 2020-04-20 15:45:22 -06:00
sysv docs: filesystems: fix renamed references 2020-04-20 15:45:22 -06:00
tracefs
ubifs mm: remove the pgprot argument to __vmalloc 2020-06-02 10:59:11 -07:00
udf for-5.8/block-2020-06-01 2020-06-02 15:29:19 -07:00
ufs
unicode .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
vboxsf vboxsf: don't use the source name in the bdi name 2020-05-07 08:45:47 -06:00
verity fs-verity: remove unnecessary extern keywords 2020-05-12 16:44:00 -07:00
xfs for-5.8/block-2020-06-01 2020-06-02 15:29:19 -07:00
zonefs for-5.8/block-2020-06-01 2020-06-02 15:29:19 -07:00
aio.c aio: fix async fsync creds 2020-05-14 16:44:24 +02:00
anon_inodes.c
attr.c
bad_inode.c
binfmt_aout.c
binfmt_elf_fdpic.c binfmt_elf_fdpic: remove the set_fs(KERNEL_DS) in elf_fdpic_core_dump 2020-05-05 16:46:10 -04:00
binfmt_elf.c Merge branch 'work.set_fs-exec' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-06-01 16:21:46 -07:00
binfmt_em86.c
binfmt_flat.c
binfmt_misc.c
binfmt_script.c
block_dev.c for-5.8/drivers-2020-06-01 2020-06-02 15:37:03 -07:00
buffer.c fs/buffer.c: use attach/detach_page_private 2020-06-02 10:59:07 -07:00
char_dev.c vfs: allow unprivileged whiteout creation 2020-05-14 16:44:23 +02:00
compat_binfmt_elf.c Merge branch 'work.set_fs-exec' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-06-01 16:21:46 -07:00
compat.c
coredump.c coredump: fix crash when umh is disabled 2020-04-28 17:54:13 +02:00
d_path.c
dax.c dax,iomap: Add helper dax_iomap_zero() to zero a range 2020-04-02 19:15:03 -07:00
dcache.c
dcookies.c
direct-io.c block: add blk_io_schedule() for avoiding task hung in sync dio 2020-05-12 20:32:42 -06:00
drop_caches.c
eventfd.c
eventpoll.c epoll: call final ep_events_available() check under the lock 2020-05-14 10:00:35 -07:00
exec.c exec: Move would_dump into flush_old_exec 2020-05-17 10:48:24 -05:00
fcntl.c
fhandle.c
file_table.c vfs: track per-sb writeback errors and report them to syncfs 2020-06-02 10:59:05 -07:00
file.c fix multiplication overflow in copy_fdtable() 2020-05-19 18:29:36 -04:00
filesystems.c fs/filesystems.c: downgrade user-reachable WARN_ONCE() to pr_warn_once() 2020-04-10 15:36:22 -07:00
fs_context.c vfs: don't parse "silent" option 2020-05-14 16:44:25 +02:00
fs_parser.c fs_parse: remove pr_notice() about each validation 2020-04-02 09:35:26 -07:00
fs_pin.c
fs_struct.c
fs_types.c
fs-writeback.c for-5.8/block-2020-06-01 2020-06-02 15:29:19 -07:00
fsopen.c
inode.c fs: inode.c: get rid of docs warnings 2020-04-20 15:45:41 -06:00
internal.h for-5.8/io_uring-2020-06-01 2020-06-02 15:42:50 -07:00
io_uring.c io_uring: fix io_kiocb.flags modification race in IOPOLL mode 2020-06-11 09:45:21 -06:00
io-wq.c io_wq: add per-wq work handler instead of per work 2020-06-08 13:47:37 -06:00
io-wq.h io_uring: avoid whole io_wq_work copy for requests completed inline 2020-06-10 17:58:46 -06:00
ioctl.c fibmap: Warn and return an error in case of block > INT_MAX 2020-04-30 07:57:46 -07:00
Kconfig docs: filesystems: fix renamed references 2020-04-20 15:45:22 -06:00
Kconfig.binfmt A fair amount of stuff this time around, dominated by yet another massive 2020-06-01 15:45:27 -07:00
libfs.c block: remove the error_sector argument to blkdev_issue_flush 2020-05-22 08:45:46 -06:00
locks.c docs: filesystems: convert mandatory-locking.txt to ReST 2020-05-05 09:22:22 -06:00
Makefile exfat: add Kconfig and Makefile 2020-03-05 21:00:40 -05:00
mbcache.c
mount.h proc/mounts: add cursor 2020-05-14 16:44:24 +02:00
mpage.c fs: convert mpage_readpages to mpage_readahead 2020-06-02 10:59:07 -07:00
namei.c vfs: allow unprivileged whiteout creation 2020-05-14 16:44:23 +02:00
namespace.c Merge branch 'from-miklos' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-06-01 16:44:06 -07:00
no-block.c
nsfs.c fs/nsfs.c: Added ns_match 2020-03-12 17:33:11 -07:00
open.c Merge branch 'akpm' (patches from Andrew) 2020-06-02 12:21:36 -07:00
pipe.c mm: kmem: rename memcg_kmem_(un)charge() into memcg_kmem_(un)charge_page() 2020-04-02 09:35:28 -07:00
pnode.c propagate_one(): mnt_set_mountpoint() needs mount_lock 2020-04-27 10:37:14 -04:00
pnode.h
posix_acl.c
proc_namespace.c proc/mounts: add cursor 2020-05-14 16:44:24 +02:00
read_write.c powerpc: Add back __ARCH_WANT_SYS_LLSEEK macro 2020-04-03 00:09:59 +11:00
readdir.c readdir.c: get rid of the last __put_user(), drop now-useless access_ok() 2020-05-01 20:29:54 -04:00
select.c
seq_file.c fs/seq_file.c: seq_read(): add info message about buggy .next functions 2020-04-10 15:36:22 -07:00
signalfd.c
splice.c for-5.8/io_uring-2020-06-01 2020-06-02 15:42:50 -07:00
stack.c
stat.c for-5.8/io_uring-2020-06-01 2020-06-02 15:42:50 -07:00
statfs.c
super.c for-5.8/block-2020-06-01 2020-06-02 15:29:19 -07:00
sync.c vfs: track per-sb writeback errors and report them to syncfs 2020-06-02 10:59:05 -07:00
timerfd.c
userfaultfd.c userfaultfd: wp: declare _UFFDIO_WRITEPROTECT conditionally 2020-04-07 10:43:40 -07:00
utimes.c utimensat: AT_EMPTY_PATH support 2020-05-14 16:44:24 +02:00
xattr.c xattr: fix uninitialized out-param 2020-04-09 15:33:09 -04:00