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Max Kellermann 478dbf1217
fs/pipe: use spinlock in pipe_read() only if there is a watch_queue 
If there is no watch_queue, holding the pipe mutex is enough to
prevent concurrent writes, and we can avoid the spinlock.

O_NOTIFICATION_QUEUE is an exotic and rarely used feature, and of all
the pipes that exist at any given time, only very few actually have a
watch_queue, therefore it appears worthwile to optimize the common
case.

This patch does not optimize pipe_resize_ring() where the spinlocks
could be avoided as well; that does not seem like a worthwile
optimization because this function is not called often.

Related commits:

- commit 8df441294dd3 ("pipe: Check for ring full inside of the
  spinlock in pipe_write()")
- commit b667b8673443 ("pipe: Advance tail pointer inside of wait
  spinlock in pipe_read()")
- commit 189b0ddc2451 ("pipe: Fix missing lock in pipe_resize_ring()")

Signed-off-by: Max Kellermann <max.kellermann@ionos.com>
Message-Id: <20230921075755.1378787-4-max.kellermann@ionos.com>
Reviewed-by: David Howells <dhowells@redhat.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
2023-10-19 11:02:48 +02:00
..
9p
- Some swap cleanups from Ma Wupeng ("fix WARN_ON in add_to_avail_list")
2023-08-29 14:25:26 -07:00
adfs
for-6.6/block-2023-08-28
2023-08-29 20:21:42 -07:00
affs
for-6.6/block-2023-08-28
2023-08-29 20:21:42 -07:00
afs
- Some swap cleanups from Ma Wupeng ("fix WARN_ON in add_to_avail_list")
2023-08-29 14:25:26 -07:00
autofs
v6.6-vfs.autofs
2023-08-28 11:39:14 -07:00
befs
for-6.6/block-2023-08-28
2023-08-29 20:21:42 -07:00
bfs
for-6.6/block-2023-08-28
2023-08-29 20:21:42 -07:00
btrfs
- Some swap cleanups from Ma Wupeng ("fix WARN_ON in add_to_avail_list")
2023-08-29 14:25:26 -07:00
cachefiles
- Some swap cleanups from Ma Wupeng ("fix WARN_ON in add_to_avail_list")
2023-08-29 14:25:26 -07:00
ceph
Mixed with some fixes and cleanups, this brings in reasonably complete
2023-09-06 12:10:15 -07:00
coda
v6.6-vfs.ctime
2023-08-28 09:31:32 -07:00
configfs
configfs: convert to ctime accessor functions
2023-07-13 10:28:05 +02:00
cramfs
v6.6-vfs.super
2023-08-28 11:04:18 -07:00
crypto
…
debugfs
Char/Misc driver changes for 6.6-rc1
2023-09-01 09:53:54 -07:00
devpts
v6.6-vfs.misc
2023-08-28 10:17:14 -07:00
dlm
dlm: fix plock lookup when using multiple lockspaces
2023-08-25 10:31:39 -05:00
ecryptfs
v6.6-vfs.misc
2023-08-28 10:17:14 -07:00
efivarfs
efivarfs: convert to ctime accessor functions
2023-07-13 10:28:06 +02:00
efs
for-6.6/block-2023-08-28
2023-08-29 20:21:42 -07:00
erofs
- Some swap cleanups from Ma Wupeng ("fix WARN_ON in add_to_avail_list")
2023-08-29 14:25:26 -07:00
exfat
for-6.6/block-2023-08-28
2023-08-29 20:21:42 -07:00
exportfs
exportfs: remove kernel-doc warnings in exportfs
2023-08-29 17:45:22 -04:00
ext2
\n
2023-08-30 12:10:50 -07:00
ext4
Many ext4 and jbd2 cleanups and bug fixes for v6.6-rc1.
2023-08-31 15:18:15 -07:00
f2fs
f2fs update for 6.6-rc1
2023-09-02 15:37:59 -07:00
fat
for-6.6/block-2023-08-28
2023-08-29 20:21:42 -07:00
freevxfs
for-6.6/block-2023-08-28
2023-08-29 20:21:42 -07:00
fscache
…
fuse
fuse update for 6.6
2023-09-05 12:45:55 -07:00
gfs2
gfs2 fixes
2023-09-05 13:00:28 -07:00
hfs
for-6.6/block-2023-08-28
2023-08-29 20:21:42 -07:00
hfsplus
for-6.6/block-2023-08-28
2023-08-29 20:21:42 -07:00
hostfs
hostfs: convert to ctime accessor functions
2023-07-24 10:30:00 +02:00
hpfs
for-6.6/block-2023-08-28
2023-08-29 20:21:42 -07:00
hugetlbfs
- Some swap cleanups from Ma Wupeng ("fix WARN_ON in add_to_avail_list")
2023-08-29 14:25:26 -07:00
iomap
for-6.6/block-2023-08-28
2023-08-29 20:21:42 -07:00
isofs
for-6.6/block-2023-08-28
2023-08-29 20:21:42 -07:00
jbd2
Many ext4 and jbd2 cleanups and bug fixes for v6.6-rc1.
2023-08-31 15:18:15 -07:00
jffs2
jffs2: convert to ctime accessor functions
2023-07-24 10:30:01 +02:00
jfs
A few small fixes
2023-08-31 15:25:01 -07:00
kernfs
Driver core changes for 6.6-rc1
2023-09-01 09:43:18 -07:00
lockd
SUNRPC: Add enum svc_auth_status
2023-08-29 17:45:22 -04:00
minix
for-6.6/block-2023-08-28
2023-08-29 20:21:42 -07:00
netfs
…
nfs
fs: add a new SB_I_NOUMASK flag
2023-10-19 11:02:47 +02:00
nfs_common
…
nfsd
NFSD 6.6 Release Notes
2023-08-31 15:32:18 -07:00
nilfs2
for-6.6/block-2023-08-28
2023-08-29 20:21:42 -07:00
nls
nls: Hide new NLS_UCS2_UTILS
2023-08-31 12:07:34 -05:00
notify
dnotify: Pass argument of fcntl_dirnotify as int
2023-07-10 14:36:12 +02:00
ntfs
for-6.6/block-2023-08-28
2023-08-29 20:21:42 -07:00
ntfs3
ntfs3: drop inode references in ntfs_put_super()
2023-09-07 10:23:37 -07:00
ocfs2
Many ext4 and jbd2 cleanups and bug fixes for v6.6-rc1.
2023-08-31 15:18:15 -07:00
omfs
for-6.6/block-2023-08-28
2023-08-29 20:21:42 -07:00
openpromfs
openpromfs: convert to ctime accessor functions
2023-07-24 10:30:03 +02:00
orangefs
fs: drop the timespec64 argument from update_time
2023-08-11 09:04:57 +02:00
overlayfs
overlayfs update for 6.6
2023-08-30 11:54:09 -07:00
proc
- Stefan Roesch has added ksm statistics to /proc/pid/smaps
2023-09-05 10:56:27 -07:00
pstore
pstore fix for v6.6-rc1
2023-09-02 10:45:17 -07:00
qnx4
for-6.6/block-2023-08-28
2023-08-29 20:21:42 -07:00
qnx6
for-6.6/block-2023-08-28
2023-08-29 20:21:42 -07:00
quota
\n
2023-08-30 12:10:50 -07:00
ramfs
ramfs: convert to ctime accessor functions
2023-07-24 10:30:04 +02:00
reiserfs
for-6.6/block-2023-08-28
2023-08-29 20:21:42 -07:00
romfs
for-6.6/block-2023-08-28
2023-08-29 20:21:42 -07:00
smb
six smb3 client fixes, one fix for nls Kconfig, one minor spnego registry update
2023-09-09 19:56:23 -07:00
squashfs
squashfs: convert to ctime accessor functions
2023-07-24 10:30:05 +02:00
sysfs
…
sysv
for-6.6/block-2023-08-28
2023-08-29 20:21:42 -07:00
tracefs
Tracing updates for 6.6:
2023-09-01 16:34:25 -07:00
ubifs
fs: drop the timespec64 argument from update_time
2023-08-11 09:04:57 +02:00
udf
\n
2023-08-30 12:10:50 -07:00
ufs
for-6.6/block-2023-08-28
2023-08-29 20:21:42 -07:00
unicode
…
vboxsf
v6.6-vfs.ctime
2023-08-28 09:31:32 -07:00
verity
fsverity: skip PKCS#7 parser when keyring is empty
2023-08-20 10:33:43 -07:00
xfs
New code for 6.6:
2023-08-30 12:34:12 -07:00
zonefs
New code for 6.6:
2023-08-28 11:59:52 -07:00
aio.c
Add x86 shadow stack support
2023-08-31 12:20:12 -07:00
anon_inodes.c
…
attr.c
v6.6-vfs.misc
2023-08-28 10:17:14 -07:00
bad_inode.c
fs: drop the timespec64 argument from update_time
2023-08-11 09:04:57 +02:00
binfmt_elf_fdpic.c
binfmt_elf_fdpic: support 64-bit systems
2023-08-23 14:17:42 -07:00
binfmt_elf_test.c
…
binfmt_elf.c
Merge branch 'expand-stack'
2023-06-28 20:35:21 -07:00
binfmt_flat.c
…
binfmt_misc.c
fs: convert to ctime accessor functions
2023-07-13 10:28:04 +02:00
binfmt_script.c
…
buffer.c
for-6.6/block-2023-08-28
2023-08-29 20:21:42 -07:00
char_dev.c
…
compat_binfmt_elf.c
…
coredump.c
v6.5/vfs.misc
2023-06-26 09:50:21 -07:00
d_path.c
…
dax.c
mm: remove enum page_entry_size
2023-08-24 16:20:30 -07:00
dcache.c
fs/dcache: Replace printk and WARN_ON by WARN
2023-08-19 13:41:11 +02:00
direct-io.c
- Yosry Ahmed brought back some cgroup v1 stats in OOM logs.
2023-06-28 10:28:11 -07:00
drop_caches.c
fs: drop_caches: draining pages before dropping caches
2023-08-18 10:12:11 -07:00
eventfd.c
eventfd: prevent underflow for eventfd semaphores
2023-07-11 11:41:34 +02:00
eventpoll.c
epoll: simplify ep_alloc()
2023-07-26 14:56:07 +02:00
exec.c
- An extensive rework of kexec and crash Kconfig from Eric DeVolder
2023-08-29 14:53:51 -07:00
fcntl.c
fcntl: Cast commands with int args explicitly
2023-07-10 14:36:11 +02:00
fhandle.c
…
file_table.c
fs: use __fput_sync in close(2)
2023-08-08 19:36:51 +02:00
file.c
v6.6-vfs.misc
2023-08-28 10:17:14 -07:00
filesystems.c
…
fs_context.c
v6.6-vfs.misc
2023-08-28 10:17:14 -07:00
fs_parser.c
…
fs_pin.c
…
fs_struct.c
kill do_each_thread()
2023-08-21 13:46:25 -07:00
fs_types.c
…
fs-writeback.c
super: make locking naming consistent
2023-08-21 14:36:57 +02:00
fsopen.c
fs: add FSCONFIG_CMD_CREATE_EXCL
2023-08-14 18:48:02 +02:00
init.c
fs: add a new SB_I_NOUMASK flag
2023-10-19 11:02:47 +02:00
inode.c
fs: rename __mnt_{want,drop}_write*() helpers
2023-09-11 15:05:50 +02:00
internal.h
fs: rename __mnt_{want,drop}_write*() helpers
2023-09-11 15:05:50 +02:00
ioctl.c
v6.6-vfs.super
2023-08-28 11:04:18 -07:00
Kconfig
for-6.6/block-2023-08-28
2023-08-29 20:21:42 -07:00
Kconfig.binfmt
riscv: support the elf-fdpic binfmt loader
2023-08-23 14:17:43 -07:00
kernel_read_file.c
fs: Fix kernel-doc warnings
2023-08-19 12:12:12 +02:00
libfs.c
Many ext4 and jbd2 cleanups and bug fixes for v6.6-rc1.
2023-08-31 15:18:15 -07:00
locks.c
NFSD 6.6 Release Notes
2023-08-31 15:32:18 -07:00
Makefile
fs: add CONFIG_BUFFER_HEAD
2023-08-02 09:13:09 -06:00
mbcache.c
…
mnt_idmapping.c
…
mount.h
…
mpage.c
…
namei.c
fs: add a new SB_I_NOUMASK flag
2023-10-19 11:02:47 +02:00
namespace.c
fs: export mnt_{get,put}_write_access() to modules
2023-09-11 15:05:52 +02:00
nsfs.c
fs: convert to ctime accessor functions
2023-07-13 10:28:04 +02:00
open.c
fs: rename __mnt_{want,drop}_write*() helpers
2023-09-11 15:05:50 +02:00
pipe.c
fs/pipe: use spinlock in pipe_read() only if there is a watch_queue
2023-10-19 11:02:48 +02:00
pnode.c
…
pnode.h
…
posix_acl.c
fs: convert to ctime accessor functions
2023-07-13 10:28:04 +02:00
proc_namespace.c
…
read_write.c
fs: Fix one kernel-doc comment
2023-08-15 08:32:45 +02:00
readdir.c
vfs: get rid of old '->iterate' directory operation
2023-08-06 15:08:35 +02:00
remap_range.c
…
select.c
…
seq_file.c
…
signalfd.c
…
splice.c
- Some swap cleanups from Ma Wupeng ("fix WARN_ON in add_to_avail_list")
2023-08-29 14:25:26 -07:00
stack.c
fs: convert to ctime accessor functions
2023-07-13 10:28:04 +02:00
stat.c
vfs: mostly undo glibc turning 'fstat()' into 'fstatat(AT_EMPTY_PATH)'
2023-09-07 09:40:30 -07:00
statfs.c
…
super.c
fs: export sget_dev()
2023-08-31 12:47:15 +02:00
sync.c
…
sysctls.c
…
timerfd.c
…
userfaultfd.c
mm: userfaultfd: remove stale comment about core dump locking
2023-08-24 16:20:27 -07:00
utimes.c
…
xattr.c
tmpfs,xattr: GFP_KERNEL_ACCOUNT for simple xattrs
2023-08-22 10:57:46 +02:00