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Jens Axboe 6d4e85e4d7 mm: mark async iocb read as NOWAIT once some data has been copied 
upstream commit id: 13bd691421bc191a402d2e0d3da5f248d170a632

Once we've copied some data for an iocb that is marked with IOCB_WAITQ,
we should no longer attempt to async lock a new page. Instead make sure
we return the copied amount, and let the caller retry, instead of
returning -EIOCBQUEUED for a new page.

This should only be possible with read-ahead disabled on the below
device, and multiple threads racing on the same file. Haven't been able
to reproduce on anything else.

Cc: stable@vger.kernel.org # v5.9
Fixes: 1a0a7853b901 ("mm: support async buffered reads in generic_file_buffered_read()")
Reported-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Ni Xun <richardni@tencent.com>
 		2022-11-03 11:32:03 +08:00
Documentation docs/bpf: Add BPF ring buffer design notes 2022-08-30 11:33:29 +08:00
LICENSES Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
arch dist: tk4: fix debugedit compact issue 2022-10-17 17:31:28 +08:00
block Add sysfs attribute to hide disk devices 2022-07-25 16:24:47 +08:00
certs certs: Fix blacklist flag type confusion 2021-04-12 12:52:25 +08:00
crypto crypto: rng - fix crypto_rng_reset() refcounting when !CRYPTO_STATS 2021-05-20 16:07:34 +08:00
dist dist: fix remote name in check-commits 2022-10-18 11:37:20 +08:00
drivers virtio-net: use NETIF_F_GRO_HW instead of NETIF_F_LRO 2022-10-18 10:47:43 +08:00
fs ext4: drop unnecessary journal handle in delalloc write 2022-11-03 11:16:26 +08:00
include mm: add support for async page locking 2022-11-03 11:24:56 +08:00
init bpf: Introduce BPF_PROG_TYPE_LSM 2022-08-30 11:33:21 +08:00
ipc ipc/util.c: sysvipc_find_ipc() incorrectly updates position index 2021-03-16 16:27:51 +08:00
kernel sli: fix the compiling error caused by memory access out of range 2022-10-14 16:20:22 +08:00
lib bug: Remove redundant condition check in report_bug 2021-05-20 16:07:55 +08:00
mm mm: mark async iocb read as NOWAIT once some data has been copied 2022-11-03 11:32:03 +08:00
net can: bcm: delay release of struct bcm_op after synchronize_rcu() 2022-09-27 10:29:35 +08:00
package package: remove TK4 legacy build system 2022-10-18 17:41:39 +08:00
samples kfifo: fix ternary sign extension bugs 2021-05-20 16:08:01 +08:00
scripts bpf: fix selftest case compile error for bpf_timer 2022-08-30 11:33:34 +08:00
security bpf: Implement bpf_local_storage for inodes 2022-08-30 11:33:29 +08:00
sound ALSA: usb: midi: don't return -ENOMEM when usb_urb_ep_type_check fails 2021-05-20 16:07:59 +08:00
tools bpf, selftests: Add redirect_peer selftest 2022-08-30 11:33:35 +08:00
usr Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
virt KVM: Stop looking for coalesced MMIO zones if the bus is destroyed 2021-05-20 16:07:44 +08:00
.clang-format Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
.cocciconfig Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
.get_maintainer.ignore Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
.gitattributes dist: hook into kernel build system 2022-10-17 02:25:35 +08:00
.gitignore dist: hook into kernel build system 2022-10-17 02:25:35 +08:00
COPYING Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
CREDITS Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
Kbuild Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
Kconfig Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
MAINTAINERS bpf: Introduce BPF_PROG_TYPE_LSM 2022-08-30 11:33:21 +08:00
Makefile dist: hook into kernel build system 2022-10-17 02:25:35 +08:00
README Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
README.md Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
backport_remove_lists.txt Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
tools_key.pub Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00

README.md

Tencent Linux Kernel 4.0