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linux/fs
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Linus Torvalds 797964253d file: reinstate f_pos locking optimization for regular files 
In commit 20ea1e7d13c1 ("file: always lock position for
FMODE_ATOMIC_POS") we ended up always taking the file pos lock, because
pidfd_getfd() could get a reference to the file even when it didn't have
an elevated file count due to threading of other sharing cases.

But Mateusz Guzik reports that the extra locking is actually measurable,
so let's re-introduce the optimization, and only force the locking for
directory traversal.

Directories need the lock for correctness reasons, while regular files
only need it for "POSIX semantics".  Since pidfd_getfd() is about
debuggers etc special things that are _way_ outside of POSIX, we can
relax the rules for that case.

Reported-by: Mateusz Guzik <mjguzik@gmail.com>
Cc: Christian Brauner <brauner@kernel.org>
Link: https://lore.kernel.org/linux-fsdevel/20230803095311.ijpvhx3fyrbkasul@f/
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2023-08-04 11:22:14 -07:00
..
9p
fs/9p: Remove unused extern declaration
2023-07-20 19:21:48 +00:00
adfs
splice: Use filemap_splice_read() instead of generic_file_splice_read()
2023-05-24 08:42:17 -06:00
affs
splice: Use filemap_splice_read() instead of generic_file_splice_read()
2023-05-24 08:42:17 -06:00
afs
afs: Fix accidental truncation when storing data
2023-07-04 12:24:32 -07:00
autofs
arch/*/configs/*defconfig: Replace AUTOFS4_FS by AUTOFS_FS
2023-07-29 14:08:22 -07:00
befs
befs: Replace all non-returning strlcpy with strscpy
2023-05-30 16:42:00 -07:00
bfs
splice: Use filemap_splice_read() instead of generic_file_splice_read()
2023-05-24 08:42:17 -06:00
btrfs
for-6.5-rc3-tag
2023-07-27 11:44:08 -07:00
cachefiles
v6.5/vfs.file
2023-06-26 10:14:36 -07:00
ceph
ceph: never send metrics if disable_send_metrics is set
2023-07-24 13:15:39 +02:00
coda
coda: Implement splice-read
2023-05-24 08:42:16 -06:00
configfs
fs: consolidate duplicate dt_type helpers
2023-04-03 09:23:54 +02:00
cramfs
splice: Use filemap_splice_read() instead of generic_file_splice_read()
2023-05-24 08:42:17 -06:00
crypto
fscrypt: Replace 1-element array with flexible array
2023-05-23 19:46:09 -07:00
debugfs
debugfs: Correct the 'debugfs_create_str' docs
2023-05-31 19:02:14 +01:00
devpts
devpts: simplify two-level sysctl registration for pty_kern_table
2023-03-13 12:36:34 +01:00
dlm
dlm for 6.5
2023-06-29 13:27:50 -07:00
ecryptfs
splice: Use filemap_splice_read() instead of generic_file_splice_read()
2023-05-24 08:42:17 -06:00
efivarfs
efivarfs: expose used and total size
2023-05-17 18:21:34 +02:00
efs
…
erofs
erofs: drop unnecessary WARN_ON() in erofs_kill_sb()
2023-08-01 16:12:24 +08:00
exfat
exfat: release s_lock before calling dir_emit()
2023-07-15 08:34:19 +09:00
exportfs
exportfs: add explicit flag to request non-decodeable file handles
2023-05-22 18:08:37 +02:00
ext2
\n
2023-06-29 13:39:51 -07:00
ext4
ext4: fix rbtree traversal bug in ext4_mb_use_preallocated
2023-07-23 08:21:14 -04:00
f2fs
f2fs update for 6.5-rc1
2023-07-05 14:14:37 -07:00
fat
splice: Use filemap_splice_read() instead of generic_file_splice_read()
2023-05-24 08:42:17 -06:00
freevxfs
There is no particular theme here - mainly quick hits all over the tree.
2023-02-23 17:55:40 -08:00
fscache
fscache: Use clear_and_wake_up_bit() in fscache_create_volume_work()
2023-01-30 12:51:54 +00:00
fuse
fuse update for 6.5
2023-07-19 11:00:27 -07:00
gfs2
gfs2 fixes
2023-07-04 11:45:16 -07:00
hfs
splice: Use filemap_splice_read() instead of generic_file_splice_read()
2023-05-24 08:42:17 -06:00
hfsplus
splice: Use filemap_splice_read() instead of generic_file_splice_read()
2023-05-24 08:42:17 -06:00
hostfs
Landlock updates for v6.5-rc1
2023-06-27 17:10:27 -07:00
hpfs
splice: Use filemap_splice_read() instead of generic_file_splice_read()
2023-05-24 08:42:17 -06:00
hugetlbfs
hugetlb: revert use of page_cache_next_miss()
2023-06-23 16:59:32 -07:00
iomap
iomap: micro optimize the ki_pos assignment in iomap_file_buffered_write
2023-07-17 08:49:57 -07:00
isofs
…
jbd2
jbd2: remove __journal_try_to_free_buffer()
2023-07-10 23:09:21 -04:00
jffs2
for-6.5/splice-2023-06-23
2023-06-26 11:52:12 -07:00
jfs
Minor bug fixes and cleanups
2023-06-29 13:10:32 -07:00
kernfs
driver core changes for 6.5-rc1
2023-07-03 12:56:23 -07:00
lockd
NFS client updates for Linux 6.5
2023-07-01 14:38:25 -07:00
minix
splice: Use filemap_splice_read() instead of generic_file_splice_read()
2023-05-24 08:42:17 -06:00
netfs
Move netfs_extract_iter_to_sg() to lib/scatterlist.c
2023-06-08 13:42:33 +02:00
nfs
NFS client updates for Linux 6.5
2023-07-01 14:38:25 -07:00
nfs_common
NFSv4.2: remove MODULE_LICENSE in non-modules
2023-04-13 13:13:52 -07:00
nfsd
nfsd-6.5 fixes:
2023-08-03 09:26:34 -07:00
nilfs2
for-6.5/block-2023-06-23
2023-06-26 12:47:20 -07:00
nls
fs/nls: make load_nls() take a const parameter
2023-07-25 00:30:02 -05:00
notify
fanotify: disallow mount/sb marks on kernel internal pseudo fs
2023-07-04 13:29:29 +02:00
ntfs
- Yosry Ahmed brought back some cgroup v1 stats in OOM logs.
2023-06-28 10:28:11 -07:00
ntfs3
driver ntfs3 for linux 6.5
2023-07-07 14:59:38 -07:00
ocfs2
docs: update ocfs2-devel mailing list address
2023-07-08 09:29:29 -07:00
omfs
splice: Use filemap_splice_read() instead of generic_file_splice_read()
2023-05-24 08:42:17 -06:00
openpromfs
…
orangefs
orangefs: Provide a splice-read wrapper
2023-05-24 08:42:16 -06:00
overlayfs
ovl: Always reevaluate the file signature for IMA
2023-07-25 15:36:22 -07:00
proc
proc/vmcore: fix signedness bug in read_from_oldmem()
2023-07-27 13:07:05 -07:00
pstore
pstore updates for v6.5-rc1
2023-06-27 21:21:32 -07:00
qnx4
qnx4: credit contributors in CREDITS
2023-03-14 12:56:30 -06:00
qnx6
qnx6: credit contributor and mark filesystem orphan
2023-03-14 12:56:30 -06:00
quota
quota: fix warning in dqgrab()
2023-06-05 16:50:30 +02:00
ramfs
- Yosry Ahmed brought back some cgroup v1 stats in OOM logs.
2023-06-28 10:28:11 -07:00
reiserfs
- Yosry Ahmed brought back some cgroup v1 stats in OOM logs.
2023-06-28 10:28:11 -07:00
romfs
splice: Use filemap_splice_read() instead of generic_file_splice_read()
2023-05-24 08:42:17 -06:00
smb
four small client fixes
2023-07-29 20:49:13 -07:00
squashfs
squashfs: fix cache race with migration
2023-07-08 09:29:30 -07:00
sysfs
sysfs: Skip empty folders creation
2023-06-15 13:37:53 +02:00
sysv
for-6.5/splice-2023-06-23
2023-06-26 11:52:12 -07:00
tracefs
fs: port ->mkdir() to pass mnt_idmap
2023-01-19 09:24:26 +01:00
ubifs
splice: Use filemap_splice_read() instead of generic_file_splice_read()
2023-05-24 08:42:17 -06:00
udf
\n
2023-06-29 13:39:51 -07:00
ufs
splice: Use filemap_splice_read() instead of generic_file_splice_read()
2023-05-24 08:42:17 -06:00
unicode
unicode: remove MODULE_LICENSE in non-modules
2023-04-13 13:13:54 -07:00
vboxsf
hardening updates for v6.5-rc1
2023-06-27 21:24:18 -07:00
verity
fsverity: improve documentation for builtin signature support
2023-06-20 22:47:55 -07:00
xfs
xfs: convert flex-array declarations in xfs attr shortform objects
2023-07-17 08:48:56 -07:00
zonefs
- Yosry Ahmed brought back some cgroup v1 stats in OOM logs.
2023-06-28 10:28:11 -07:00
aio.c
fs/aio: Stop allocating aio rings from HIGHMEM
2023-06-15 09:22:23 +02:00
anon_inodes.c
…
attr.c
nfs: use vfs setgid helper
2023-03-30 08:51:48 +02:00
bad_inode.c
fs: port ->permission() to pass mnt_idmap
2023-01-19 09:24:28 +01:00
binfmt_elf_fdpic.c
binfmt: Slightly simplify elf_fdpic_map_file()
2023-05-30 15:49:46 -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
binfmt_misc: fix shift-out-of-bounds in check_special_flags
2022-12-02 13:57:04 -08:00
binfmt_script.c
…
buffer.c
\n
2023-06-29 13:39:51 -07:00
char_dev.c
vfs: Replace all non-returning strlcpy with strscpy
2023-05-15 09:42:01 +02:00
compat_binfmt_elf.c
…
coredump.c
v6.5/vfs.misc
2023-06-26 09:50:21 -07:00
d_path.c
fs: d_path: include internal.h
2023-05-17 09:16:59 +02:00
dax.c
dax: enable dax fault handler to report VM_FAULT_HWPOISON
2023-06-26 07:54:23 -06:00
dcache.c
…
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
…
eventfd.c
eventfd: show the EFD_SEMAPHORE flag in fdinfo
2023-06-15 09:22:23 +02:00
eventpoll.c
v6.5/vfs.misc
2023-06-26 09:50:21 -07:00
exec.c
\n
2023-06-29 13:31:44 -07:00
fcntl.c
fs.idmapped.v6.3
2023-02-20 11:53:11 -08:00
fhandle.c
fsnotify: move fsnotify_open() hook into do_dentry_open()
2023-06-12 10:43:45 +02:00
file_table.c
fs: move cleanup from init_file() into its callers
2023-07-02 13:15:49 +02:00
file.c
file: reinstate f_pos locking optimization for regular files
2023-08-04 11:22:14 -07:00
filesystems.c
…
fs_context.c
fs: avoid empty option when generating legacy mount string
2023-06-07 21:49:55 +02:00
fs_parser.c
ext4: journal_path mount options should follow links
2022-12-01 10:46:54 -05:00
fs_pin.c
…
fs_struct.c
…
fs_types.c
…
fs-writeback.c
writeback: move wb_over_bg_thresh() call outside lock section
2023-06-09 16:25:14 -07:00
fsopen.c
…
init.c
fs: port ->permission() to pass mnt_idmap
2023-01-19 09:24:28 +01:00
inode.c
fs: don't assume arguments are non-NULL
2023-07-04 10:21:11 +02:00
internal.h
v6.5/vfs.file
2023-06-26 10:14:36 -07:00
ioctl.c
fs: port inode_owner_or_capable() to mnt_idmap
2023-01-19 09:24:29 +01:00
Kconfig
smb: move client and server files to common directory fs/smb
2023-05-24 16:29:21 -05:00
Kconfig.binfmt
…
kernel_read_file.c
…
libfs.c
fs: factor out a direct_write_fallback helper
2023-06-09 16:25:53 -07:00
locks.c
filelocks: use mount idmapping for setlease permission check
2023-03-09 22:36:12 +01:00
Makefile
for-6.5/block-2023-06-23
2023-06-26 12:47:20 -07:00
mbcache.c
ext4: fix deadlock due to mbcache entry corruption
2022-12-08 21:49:25 -05:00
mnt_idmapping.c
fs: move mnt_idmap
2023-01-19 09:24:30 +01:00
mount.h
…
mpage.c
mpage: use folios in bio end_io handler
2023-04-18 16:30:02 -07:00
namei.c
fs: no need to check source
2023-07-04 10:20:29 +02:00
namespace.c
v6.5/vfs.mount
2023-06-26 10:27:04 -07:00
nsfs.c
kill the last remaining user of proc_ns_fget()
2023-04-20 22:55:35 -04:00
open.c
\n
2023-06-29 13:31:44 -07:00
pipe.c
pipe: check for IOCB_NOWAIT alongside O_NONBLOCK
2023-05-12 17:17:27 +02:00
pnode.c
fs: allow to mount beneath top mount
2023-05-19 04:30:22 +02:00
pnode.h
fs: allow to mount beneath top mount
2023-05-19 04:30:22 +02:00
posix_acl.c
acl: don't depend on IOP_XATTR
2023-03-06 09:59:20 +01:00
proc_namespace.c
tty, proc, kernfs, random: Use copy_splice_read()
2023-05-24 08:42:16 -06:00
read_write.c
splice: Use filemap_splice_read() instead of generic_file_splice_read()
2023-05-24 08:42:17 -06:00
readdir.c
readdir: Replace one-element arrays with flexible-array members
2023-06-21 09:06:59 +02:00
remap_range.c
fs: use UB-safe check for signed addition overflow in remap_verify_area
2023-05-24 11:03:59 +02:00
select.c
…
seq_file.c
use less confusing names for iov_iter direction initializers
2022-11-25 13:01:55 -05:00
signalfd.c
…
splice.c
splice, net: Fix splice_to_socket() for O_NONBLOCK socket
2023-07-26 21:56:06 -07:00
stack.c
…
stat.c
fs.idmapped.v6.3
2023-02-20 11:53:11 -08:00
statfs.c
statfs: enforce statfs[64] structure initialization
2023-05-17 15:20:17 +02:00
super.c
\n
2023-06-29 13:39:51 -07:00
sync.c
…
sysctls.c
sysctl: Refactor base paths registrations
2023-05-23 21:43:26 -07:00
timerfd.c
…
userfaultfd.c
Merge mm-hotfixes-stable into mm-stable to pick up depended-upon changes.
2023-06-23 16:58:19 -07:00
utimes.c
fs.idmapped.v6.3
2023-02-20 11:53:11 -08:00
xattr.c
fs: don't call posix_acl_listxattr in generic_listxattr
2023-05-17 15:25:20 +02:00