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Vivek Goyal 2b5e027657 virtiofs: schedule blocking async replies in separate worker 
[ Upstream commit bb737bbe48 ]

In virtiofs (unlike in regular fuse) processing of async replies is
serialized.  This can result in a deadlock in rare corner cases when
there's a circular dependency between the completion of two or more async
replies.

Such a deadlock can be reproduced with xfstests:generic/503 if TEST_DIR ==
SCRATCH_MNT (which is a misconfiguration):

 - Process A is waiting for page lock in worker thread context and blocked
   (virtio_fs_requests_done_work()).
 - Process B is holding page lock and waiting for pending writes to
   finish (fuse_wait_on_page_writeback()).
 - Write requests are waiting in virtqueue and can't complete because
   worker thread is blocked on page lock (process A).

Fix this by creating a unique work_struct for each async reply that can
block (O_DIRECT read).

Fixes: a62a8ef9d9 ("virtio-fs: add virtiofs filesystem")
Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-06-24 17:50:21 +02:00
..
9p
Merge tag '9p-for-5.4' of git://github.com/martinetd/linux
2019-09-27 15:10:34 -07:00
adfs
Merge branch 'work.adfs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2019-07-19 11:33:22 -07:00
affs
affs: fix a memory leak in affs_remount
2020-01-17 19:48:50 +01:00
afs
rxrpc: Fix the excessive initial retransmission timeout
2020-05-27 17:46:48 +02:00
autofs
autofs: fix a leak in autofs_expire_indirect()
2019-10-25 00:03:11 -04:00
befs
fs: Fill in max and min timestamps in superblock
2019-08-30 07:27:17 -07:00
bfs
fs: Fill in max and min timestamps in superblock
2019-08-30 07:27:17 -07:00
btrfs
btrfs: fix space_info bytes_may_use underflow during space cache writeout
2020-06-22 09:31:13 +02:00
cachefiles
cachefiles: Fix race between read_waiter and read_copier involving op->to_do
2020-06-03 08:21:11 +02:00
ceph
ceph: flush release queue when handling caps for unknown inode
2020-06-03 08:21:25 +02:00
cifs
cifs: set up next DFS target before generic_ip_connect()
2020-06-24 17:50:18 +02:00
coda
Merge tag 'y2038-vfs' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground
2019-09-19 09:42:37 -07:00
configfs
configfs: fix config_item refcnt leak in configfs_rmdir()
2020-05-27 17:46:30 +02:00
cramfs
cramfs: fix usage on non-MTD device
2019-11-23 21:44:49 -05:00
crypto
fscrypt: don't evict dirty inodes after removing key
2020-03-18 07:17:53 +01:00
debugfs
debugfs: Check module state before warning in {full/open}_proxy_open()
2020-04-17 10:50:02 +02:00
devpts
devpts_pty_kill(): don't bother with d_delete()
2019-09-03 09:30:56 -04:00
dlm
Merge tag 'dlm-5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/linux-dlm
2019-07-12 17:37:53 -07:00
ecryptfs
ecryptfs: replace BUG_ON with error handling code
2020-02-28 17:22:26 +01:00
efivarfs
Merge branch 'work.mount0' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2019-07-19 10:42:02 -07:00
efs
fs: Fill in max and min timestamps in superblock
2019-08-30 07:27:17 -07:00
erofs
erofs: correct the remaining shrink objects
2020-04-17 10:50:16 +02:00
exportfs
exportfs_decode_fh(): negative pinned may become positive without the parent locked
2019-11-10 11:56:05 -05:00
ext2
ext2: fix debug reference to ext2_xattr_cache
2020-04-23 10:36:41 +02:00
ext4
ext4: fix race between ext4_sync_parent() and rename()
2020-06-22 09:31:16 +02:00
f2fs
f2fs: handle readonly filesystem in f2fs_ioc_shutdown()
2020-06-24 17:50:19 +02:00
fat
fat: don't allow to mount if the FAT length == 0
2020-06-17 16:40:36 +02:00
freevxfs
fs: Fill in max and min timestamps in superblock
2019-08-30 07:27:17 -07:00
fscache
…
fuse
virtiofs: schedule blocking async replies in separate worker
2020-06-24 17:50:21 +02:00
gfs2
gfs2: Even more gfs2_find_jhead fixes
2020-06-17 16:40:21 +02:00
hfs
…
hfsplus
hfsplus: fix crash and filesystem corruption when deleting files
2020-04-17 10:50:22 +02:00
hostfs
…
hpfs
fs: hpfs: Initialize filesystem timestamp ranges
2019-08-30 08:11:25 -07:00
hugetlbfs
mm/hugetlbfs: fix for_each_hstate() loop in init_hugetlbfs_fs()
2020-01-04 19:19:19 +01:00
iomap
iomap: fix return value of iomap_dio_bio_actor on 32bit systems
2020-01-04 19:17:31 +01:00
isofs
Merge tag 'y2038-vfs' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground
2019-09-19 09:42:37 -07:00
jbd2
jbd2: improve comments about freeing data buffers whose page mapping is NULL
2020-04-21 09:04:52 +02:00
jffs2
Revert "jffs2: Fix possible null-pointer dereferences in jffs2_add_frag_to_fragtree()"
2019-12-04 22:31:06 +01:00
jfs
Merge tag 'y2038-vfs' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground
2019-09-19 09:42:37 -07:00
kernfs
kernfs: fix ino wrap-around detection
2019-12-13 08:42:53 +01:00
lockd
…
minix
fs: Fill in max and min timestamps in superblock
2019-08-30 07:27:17 -07:00
nfs
NFSv3: fix rpc receive buffer size for MOUNT call
2020-05-20 08:20:27 +02:00
nfs_common
…
nfsd
nfsd: Fix svc_xprt refcnt leak when setup callback client failed
2020-06-24 17:50:17 +02:00
nilfs2
nilfs2: fix null pointer dereference at nilfs_segctor_do_construct()
2020-06-17 16:40:29 +02:00
nls
…
notify
fanotify: fix ignore mask logic for events on child and on dir
2020-06-17 16:40:24 +02:00
ntfs
utimes: Clamp the timestamps in notify_change()
2020-02-11 04:35:12 -08:00
ocfs2
dlmfs_file_write(): fix the bogosity in handling non-zero *ppos
2020-05-06 08:15:09 +02:00
omfs
fs: omfs: Initialize filesystem timestamp ranges
2019-08-30 08:11:25 -07:00
openpromfs
Merge branch 'work.mount0' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2019-07-19 10:42:02 -07:00
orangefs
help_next should increase position index
2020-02-24 08:37:02 +01:00
overlayfs
ovl: initialize error in ovl_copy_xattr
2020-06-17 16:40:32 +02:00
proc
proc: Use new_inode not new_inode_pseudo
2020-06-17 16:40:33 +02:00
pstore
pstore: pstore_ftrace_seq_next should increase position index
2020-04-17 10:50:12 +02:00
qnx4
fs: Fill in max and min timestamps in superblock
2019-08-30 07:27:17 -07:00
qnx6
fs: Fill in max and min timestamps in superblock
2019-08-30 07:27:17 -07:00
quota
fs: avoid softlockups in s_inodes iterators
2020-01-12 12:21:37 +01:00
ramfs
vfs: Convert ramfs, shmem, tmpfs, devtmpfs, rootfs to use the new mount API
2019-09-12 21:05:34 -04:00
reiserfs
reiserfs: prevent NULL pointer dereference in reiserfs_insert_item()
2020-02-24 08:37:00 +01:00
romfs
Merge branch 'work.mount2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2019-09-19 10:06:57 -07:00
squashfs
Merge branch 'work.mount2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2019-09-19 10:06:57 -07:00
sysfs
Merge branch 'work.mount0' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2019-07-19 10:42:02 -07:00
sysv
fs: sysv: Initialize filesystem timestamp ranges
2019-08-30 07:27:18 -07:00
tracefs
tracing: Do not create tracefs files if tracefs lockdown is in effect
2019-10-12 20:49:07 -04:00
ubifs
ubifs: remove broken lazytime support
2020-05-27 17:46:14 +02:00
udf
udf: Fix free space reporting for metadata and virtual partitions
2020-02-24 08:36:44 +01:00
ufs
Merge tag 'y2038-vfs' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground
2019-09-19 09:42:37 -07:00
unicode
unicode: make array 'token' static const, makes object smaller
2019-09-17 11:48:24 -04:00
verity
fs-verity: support builtin file signatures
2019-08-12 19:33:50 -07:00
xfs
xfs: fix duplicate verification from xfs_qm_dqflush()
2020-06-22 09:31:03 +02:00
aio.c
aio: fix async fsync creds
2020-06-17 16:40:24 +02:00
anon_inodes.c
Merge branch 'work.mount0' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2019-07-19 10:42:02 -07:00
attr.c
utimes: Clamp the timestamps in notify_change()
2020-02-11 04:35:12 -08:00
bad_inode.c
…
binfmt_aout.c
…
binfmt_elf_fdpic.c
…
binfmt_elf.c
fs/binfmt_elf.c: allocate initialized memory in fill_thread_core_info()
2020-06-03 08:21:27 +02:00
binfmt_em86.c
…
binfmt_flat.c
fs/binfmt_flat.c: remove set but not used variable 'inode'
2019-07-16 19:23:22 -07:00
binfmt_misc.c
Merge branch 'work.mount0' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2019-07-19 10:42:02 -07:00
binfmt_script.c
…
block_dev.c
hibernate: Allow uswsusp to write to swap
2020-04-23 10:36:34 +02:00
buffer.c
ext4: use non-movable memory for superblock readahead
2020-04-23 10:36:15 +02:00
char_dev.c
chardev: Avoid potential use-after-free in 'chrdev_open()'
2020-01-14 20:08:18 +01:00
compat_binfmt_elf.c
…
compat_ioctl.c
fix compat handling of FICLONERANGE, FIDEDUPERANGE and FS_IOC_FIEMAP
2020-01-09 10:20:05 +01:00
compat.c
…
coredump.c
coredump: fix crash when umh is disabled
2020-05-14 07:58:27 +02:00
d_path.c
[PATCH] fix d_absolute_path() interplay with fsmount()
2019-08-30 19:31:09 -04:00
dax.c
dax: pass NOWAIT flag to iomap_apply
2020-03-05 16:43:36 +01:00
dcache.c
Merge branch 'work.dcache2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2019-07-20 09:15:51 -07:00
dcookies.c
…
direct-io.c
fs/direct-io.c: fix kernel-doc warning
2019-10-14 15:04:01 -07:00
drop_caches.c
fs: avoid softlockups in s_inodes iterators
2020-01-12 12:21:37 +01:00
eventfd.c
eventfd: track eventfd_signal() recursion depth
2020-02-11 04:35:37 -08:00
eventpoll.c
eventpoll: fix missing wakeup for ovflist in ep_poll_callback
2020-05-14 07:58:26 +02:00
exec.c
exec: Move would_dump into flush_old_exec
2020-05-20 08:20:34 +02:00
fcntl.c
…
fhandle.c
fs/handle.c - fix up kerneldoc
2019-08-07 21:51:47 -04:00
file_table.c
vfs: Export flush_delayed_fput for use by knfsd.
2019-08-19 11:00:39 -04:00
file.c
fix multiplication overflow in copy_fdtable()
2020-05-27 17:46:12 +02:00
filesystems.c
fs/filesystems.c: downgrade user-reachable WARN_ONCE() to pr_warn_once()
2020-04-17 10:50:21 +02:00
fs_context.c
vfs: subtype handling moved to fuse
2019-09-06 21:28:49 +02:00
fs_parser.c
vfs: Make fs_parse() handle fs_param_is_fd-type params better
2019-09-12 21:06:14 -04:00
fs_pin.c
switch the remnants of releasing the mountpoint away from fs_pin
2019-07-16 22:52:37 -04:00
fs_struct.c
…
fs_types.c
…
fs-writeback.c
memcg: fix a crash in wb_workfn when a device disappears
2020-02-11 04:35:11 -08:00
fsopen.c
Merge branch 'work.mount0' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2019-07-19 10:42:02 -07:00
inode.c
futex: Fix inode life-time issue
2020-03-25 08:25:58 +01:00
internal.h
fs: move guard_bio_eod() after bio_set_op_attrs
2020-01-17 19:48:21 +01:00
io_uring.c
io_uring: use kvfree() in io_sqe_buffer_register()
2020-06-17 16:40:26 +02:00
ioctl.c
compat_ioctl: add compat_ptr_ioctl()
2019-12-17 19:55:30 +01:00
Kconfig
Merge tag 'fsverity-for-linus' of git://git.kernel.org/pub/scm/fs/fscrypt/fscrypt
2019-09-18 16:59:14 -07:00
Kconfig.binfmt
…
libfs.c
libfs: fix infoleak in simple_attr_read()
2020-04-01 11:02:17 +02:00
locks.c
locks: reinstate locks_delete_block optimization
2020-03-25 08:25:41 +01:00
Makefile
Merge tag 'fsverity-for-linus' of git://git.kernel.org/pub/scm/fs/fscrypt/fscrypt
2019-09-18 16:59:14 -07:00
mbcache.c
…
mount.h
switch the remnants of releasing the mountpoint away from fs_pin
2019-07-16 22:52:37 -04:00
mpage.c
fs: move guard_bio_eod() after bio_set_op_attrs
2020-01-17 19:48:21 +01:00
namei.c
namei: only return -ECHILD from follow_dotdot_rcu()
2020-03-05 16:43:48 +01:00
namespace.c
fs/namespace.c: fix use-after-free of mount in mnt_warn_timestamp_expiry()
2019-10-16 23:15:09 -04:00
no-block.c
…
nsfs.c
…
open.c
cifs_atomic_open(): fix double-put on late allocation failure
2020-03-18 07:17:51 +01:00
pipe.c
…
pnode.c
propagate_one(): mnt_set_mountpoint() needs mount_lock
2020-05-02 08:48:44 +02:00
pnode.h
…
posix_acl.c
…
proc_namespace.c
vfs: subtype handling moved to fuse
2019-09-06 21:28:49 +02:00
read_write.c
fs: allow deduplication of eof block into the end of the destination file
2020-02-11 04:35:23 -08:00
readdir.c
readdir: be more conservative with directory entry names
2020-01-29 16:45:31 +01:00
select.c
fs/select.c: use struct_size() in kmalloc()
2019-07-16 19:23:25 -07:00
seq_file.c
seq_file: fix problem when seeking mid-record
2019-08-13 16:06:52 -07:00
signalfd.c
…
splice.c
splice: only read in as much information as there is pipe buffer space
2019-12-17 19:56:52 +01:00
stack.c
…
stat.c
…
statfs.c
vfs: Fix EOVERFLOW testing in put_compat_statfs64
2019-10-03 14:21:35 -07:00
super.c
Fix use after free in get_tree_bdev()
2020-05-06 08:15:15 +02:00
sync.c
…
timerfd.c
timerfd: Prepare for PREEMPT_RT
2019-08-01 20:51:23 +02:00
userfaultfd.c
userfaultfd: require CAP_SYS_PTRACE for UFFD_FEATURE_EVENT_FORK
2020-01-04 19:18:32 +01:00
utimes.c
utimes: Clamp the timestamps in notify_change()
2020-02-11 04:35:12 -08:00
xattr.c
…