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Date: Sun, 27 Aug 2023 21:28:24 +0800
From: Hao Xu <hao.xu@...ux.dev>
To: io-uring@...r.kernel.org,
Jens Axboe <axboe@...nel.dk>
Cc: Dominique Martinet <asmadeus@...ewreck.org>,
Pavel Begunkov <asml.silence@...il.com>,
Christian Brauner <brauner@...nel.org>,
Alexander Viro <viro@...iv.linux.org.uk>,
Stefan Roesch <shr@...com>,
Clay Harris <bugs@...ycon.org>,
Dave Chinner <david@...morbit.com>,
"Darrick J . Wong" <djwong@...nel.org>,
linux-fsdevel@...r.kernel.org,
linux-xfs@...r.kernel.org,
linux-ext4@...r.kernel.org,
linux-cachefs@...hat.com,
ecryptfs@...r.kernel.org,
linux-nfs@...r.kernel.org,
linux-unionfs@...r.kernel.org,
bpf@...r.kernel.org,
netdev@...r.kernel.org,
linux-s390@...r.kernel.org,
linux-kernel@...r.kernel.org,
linux-block@...r.kernel.org,
linux-btrfs@...r.kernel.org,
codalist@...a.cs.cmu.edu,
linux-f2fs-devel@...ts.sourceforge.net,
cluster-devel@...hat.com,
linux-mm@...ck.org,
linux-nilfs@...r.kernel.org,
devel@...ts.orangefs.org,
linux-cifs@...r.kernel.org,
samba-technical@...ts.samba.org,
linux-mtd@...ts.infradead.org,
Wanpeng Li <wanpengli@...cent.com>
Subject: [PATCH v6 00/11] io_uring getdents
From: Hao Xu <howeyxu@...cent.com>
This series introduce getdents64 to io_uring, the code logic is similar
with the snychronized version's. It first try nowait issue, and offload
it to io-wq threads if the first try fails.
Patch1 and Patch2 are some preparation
Patch3 supports nowait for xfs getdents code
Patch4-11 are vfs change, include adding helpers and trylock for locks
Tests I've done:
A liburing test case for functional test:
https://github.com/HowHsu/liburing/commit/39dc9a8e19c06a8cebf8c2301b85320eb45c061e?diff=unified
Tested it with a liburing performance test:
https://github.com/HowHsu/liburing/blob/getdents/test/getdents2.c
The test is controlled by the below script[2] which runs getdents2.t 100
times and calulate the avg.
The result show that io_uring version is about 2.6% faster:
note:
[1] the number of getdents call/request in io_uring and normal sync version
are made sure to be same beforehand.
[2] run_getdents.py
```python3
import subprocess
N = 100
sum = 0.0
args = ["/data/home/howeyxu/tmpdir", "sync"]
for i in range(N):
output = subprocess.check_output(["./liburing/test/getdents2.t"] + args)
sum += float(output)
average = sum / N
print("Average of sync:", average)
sum = 0.0
args = ["/data/home/howeyxu/tmpdir", "iouring"]
for i in range(N):
output = subprocess.check_output(["./liburing/test/getdents2.t"] + args)
sum += float(output)
average = sum / N
print("Average of iouring:", average)
```
v5->v6:
- remove xfs journal stuff since there are fundamental issues in the
design.
v4->v5:
- move atime update to the beginning of getdents operation
- trylock for i_rwsem
- nowait semantics for involved xfs journal stuff
v3->v4:
- add Dave's xfs nowait code and fix a deadlock problem, with some code
style tweak.
- disable fixed file to avoid a race problem for now
- add a test program.
v2->v3:
- removed the kernfs patches
- add f_pos_lock logic
- remove the "reduce last EOF getdents try" optimization since
Dominique reports that doesn't make difference
- remove the rewind logic, I think the right way is to introduce lseek
to io_uring not to patch this logic to getdents.
- add Singed-off-by of Stefan Roesch for patch 1 since checkpatch
complained that Co-developed-by someone should be accompanied with
Signed-off-by same person, I can remove them if Stefan thinks that's
not proper.
Dominique Martinet (1):
fs: split off vfs_getdents function of getdents64 syscall
Hao Xu (10):
xfs: add NOWAIT semantics for readdir
vfs: add nowait flag for struct dir_context
vfs: add a vfs helper for io_uring file pos lock
vfs: add file_pos_unlock() for io_uring usage
vfs: add a nowait parameter for touch_atime()
vfs: add nowait parameter for file_accessed()
vfs: move file_accessed() to the beginning of iterate_dir()
vfs: error out -EAGAIN if atime needs to be updated
vfs: trylock inode->i_rwsem in iterate_dir() to support nowait
io_uring: add support for getdents
arch/s390/hypfs/inode.c | 2 +-
block/fops.c | 2 +-
fs/btrfs/file.c | 2 +-
fs/btrfs/inode.c | 2 +-
fs/cachefiles/namei.c | 2 +-
fs/coda/dir.c | 4 +--
fs/ecryptfs/file.c | 4 +--
fs/ext2/file.c | 4 +--
fs/ext4/file.c | 6 ++--
fs/f2fs/file.c | 4 +--
fs/file.c | 13 ++++++++
fs/fuse/dax.c | 2 +-
fs/fuse/file.c | 4 +--
fs/gfs2/file.c | 2 +-
fs/hugetlbfs/inode.c | 2 +-
fs/inode.c | 10 ++++--
fs/internal.h | 8 +++++
fs/namei.c | 4 +--
fs/nfsd/vfs.c | 2 +-
fs/nilfs2/file.c | 2 +-
fs/orangefs/file.c | 2 +-
fs/orangefs/inode.c | 2 +-
fs/overlayfs/file.c | 2 +-
fs/overlayfs/inode.c | 2 +-
fs/pipe.c | 2 +-
fs/ramfs/file-nommu.c | 2 +-
fs/readdir.c | 61 ++++++++++++++++++++++++++--------
fs/smb/client/cifsfs.c | 2 +-
fs/splice.c | 2 +-
fs/stat.c | 2 +-
fs/ubifs/file.c | 2 +-
fs/udf/file.c | 2 +-
fs/xfs/libxfs/xfs_da_btree.c | 16 +++++++++
fs/xfs/libxfs/xfs_da_btree.h | 1 +
fs/xfs/libxfs/xfs_dir2_block.c | 7 ++--
fs/xfs/libxfs/xfs_dir2_priv.h | 2 +-
fs/xfs/scrub/dir.c | 2 +-
fs/xfs/scrub/readdir.c | 2 +-
fs/xfs/xfs_dir2_readdir.c | 49 +++++++++++++++++++++------
fs/xfs/xfs_file.c | 6 ++--
fs/xfs/xfs_inode.c | 27 +++++++++++++++
fs/xfs/xfs_inode.h | 17 ++++++----
fs/zonefs/file.c | 4 +--
include/linux/file.h | 7 ++++
include/linux/fs.h | 15 +++++++--
include/uapi/linux/io_uring.h | 1 +
io_uring/fs.c | 53 +++++++++++++++++++++++++++++
io_uring/fs.h | 3 ++
io_uring/opdef.c | 8 +++++
kernel/bpf/inode.c | 4 +--
mm/filemap.c | 8 ++---
mm/shmem.c | 6 ++--
net/unix/af_unix.c | 4 +--
53 files changed, 310 insertions(+), 96 deletions(-)
--
2.25.1
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