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linux/fs
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Mateusz Guzik 0ef625bba6
vfs: support statx(..., NULL, AT_EMPTY_PATH, ...) 
The newly used helper also checks for empty ("") paths.

NULL paths with any flag value other than AT_EMPTY_PATH go the usual
route and end up with -EFAULT to retain compatibility (Rust is abusing
calls of the sort to detect availability of statx).

This avoids path lookup code, lockref management, memory allocation and
in case of NULL path userspace memory access (which can be quite
expensive with SMAP on x86_64).

Benchmarked with statx(..., AT_EMPTY_PATH, ...) running on Sapphire
Rapids, with the "" path for the first two cases and NULL for the last
one.

Results in ops/s:
stock:     4231237
pre-check: 5944063 (+40%)
NULL path: 6601619 (+11%/+56%)

Signed-off-by: Mateusz Guzik <mjguzik@gmail.com>
Link: https://lore.kernel.org/r/20240625151807.620812-1-mjguzik@gmail.com
Tested-by: Xi Ruoyao <xry111@xry111.site>
[brauner: use path_mounted() and other tweaks]
Signed-off-by: Christian Brauner <brauner@kernel.org>
2024-06-27 18:31:20 +02:00
..
9p netfs: Remove the old writeback code 2024-05-01 18:07:38 +01:00
adfs mm, slab: remove last vestiges of SLAB_MEM_SPREAD 2024-03-12 20:32:19 -07:00
affs affs: remove SLAB_MEM_SPREAD flag usage 2024-02-26 11:36:28 +01:00
afs vfs-6.10.netfs 2024-05-13 12:14:03 -07:00
autofs dcache stuff for this cycle 2024-01-11 20:11:35 -08:00
bcachefs bcachefs fixes for 6.10-rc1 2024-05-24 09:07:22 -07:00
befs mm, slab: remove last vestiges of SLAB_MEM_SPREAD 2024-03-12 20:32:19 -07:00
bfs mm, slab: remove last vestiges of SLAB_MEM_SPREAD 2024-03-12 20:32:19 -07:00
btrfs for-6.10-tag 2024-05-24 09:40:31 -07:00
cachefiles Assorted commits that had missed the last merge window... 2024-05-21 13:11:44 -07:00
ceph We have a series from Xiubo that adds support for additional access 2024-05-25 14:23:58 -07:00
coda mm, slab: remove last vestiges of SLAB_MEM_SPREAD 2024-03-12 20:32:19 -07:00
configfs
cramfs use ->bd_mapping instead of ->bd_inode->i_mapping 2024-05-03 02:36:51 -04:00
crypto The usual shower of singleton fixes and minor series all over MM, 2024-05-19 09:21:03 -07:00
debugfs vfs: Convert debugfs to use the new mount API 2024-03-26 09:04:54 +01:00
devpts
dlm dlm: return -ENOMEM if ls_recover_buf fails 2024-04-23 16:08:55 -05:00
ecryptfs hardening updates for 6.10-rc1 2024-05-13 14:14:05 -07:00
efivarfs efi: Clear up misconceptions about a maximum variable name size 2024-04-13 10:33:02 +02:00
efs efs: remove SLAB_MEM_SPREAD flag usage 2024-02-27 11:21:33 +01:00
erofs Changes since last update: 2024-05-24 09:31:50 -07:00
exfat exfat: zero the reserved fields of file and stream extension dentries 2024-04-25 21:59:59 +09:00
exportfs fhandle: relax open_by_handle_at() permission checks 2024-05-28 15:57:23 +02:00
ext2 ext2: Remove LEGACY_DIRECT_IO dependency 2024-05-03 11:50:28 +02:00
ext4 bd_inode series 2024-05-21 09:51:42 -07:00
f2fs f2fs: Use in_group_or_capable() helper 2024-06-25 11:15:48 +02:00
fat fs: add kernel-doc comments to fat_parse_long() 2024-04-25 21:07:02 -07:00
freevxfs freevxfs: Convert freevxfs to the new mount API. 2024-03-26 09:04:53 +01:00
fuse fuse: Use in_group_or_capable() helper 2024-06-25 11:15:48 +02:00
gfs2 bd_inode series 2024-05-21 09:51:42 -07:00
hfs hfs: fix to initialize fields of hfs_inode_info after hfs_alloc_inode() 2024-06-25 11:15:47 +02:00
hfsplus hfsplus: fix to avoid false alarm of circular locking 2024-06-21 11:41:04 +02:00
hostfs
hpfs mm, slab: remove last vestiges of SLAB_MEM_SPREAD 2024-03-12 20:32:19 -07:00
hugetlbfs The usual shower of singleton fixes and minor series all over MM, 2024-05-19 09:21:03 -07:00
iomap Kbuild updates for v6.10 2024-05-18 12:39:20 -07:00
isofs isofs: Use *-y instead of *-objs in Makefile 2024-05-09 18:09:57 +02:00
jbd2 bd_inode series 2024-05-21 09:51:42 -07:00
jffs2 This pull request contains the following changes for JFFS2: 2024-05-25 13:23:42 -07:00
jfs fs,block: yield devices early 2024-03-27 13:17:15 +01:00
kernfs kernfs: mount: Remove unnecessary ‘NULL’ values from knparent 2024-05-04 19:02:39 +02:00
lockd lockd: host: Remove unnecessary statements＇host = NULL;＇ 2024-05-06 09:07:20 -04:00
minix minix: convert minix to use the new mount api 2024-03-26 09:04:55 +01:00
netfs smb3: reenable swapfiles over SMB3 mounts 2024-05-21 11:14:55 -05:00
nfs NFS client updates for Linux 6.10 2024-05-23 13:51:09 -07:00
nfs_common
nfsd fhandle: relax open_by_handle_at() permission checks 2024-05-28 15:57:23 +02:00
nilfs2 nilfs2: fix potential hang in nilfs_detach_log_writer() 2024-05-24 11:55:07 -07:00
nls
notify Revert "fanotify: remove unneeded sub-zero check for unsigned value" 2024-05-20 12:43:58 -07:00
ntfs3 driver ntfs3 for linux 6.10 2024-05-25 14:19:01 -07:00
ocfs2 tracing/treewide: Remove second parameter of __assign_str() 2024-05-22 20:14:47 -04:00
omfs
openpromfs openpromfs: finish conversion to the new mount API 2024-03-26 09:04:54 +01:00
orangefs orangefs: fix out-of-bounds fsid access 2024-05-14 17:44:14 -07:00
overlayfs overlayfs update for 6.10 2024-05-22 09:23:18 -07:00
proc proc: Remove usage of the deprecated ida_simple_xx() API 2024-06-25 11:15:47 +02:00
pstore pstore/zone: Don't clear memory twice 2024-03-09 12:33:22 -08:00
qnx4 mm, slab: remove last vestiges of SLAB_MEM_SPREAD 2024-03-12 20:32:19 -07:00
qnx6 qnx6: convert qnx6 to use the new mount api 2024-03-26 09:04:53 +01:00
quota vfs: replace WARN(down_read_trylock, ...) abuse with proper asserts 2024-06-03 15:45:47 +02:00
ramfs mm: switch mm->get_unmapped_area() to a flag 2024-04-25 20:56:25 -07:00
reiserfs getting rid of bogus set_blocksize() uses, switching it 2024-05-21 08:34:51 -07:00
romfs fs,block: yield devices early 2024-03-27 13:17:15 +01:00
smb four smb client fixes, including two important netfs integration fixes 2024-05-25 22:33:10 -07:00
squashfs Mainly singleton patches, documented in their respective changelogs. 2024-05-19 14:02:03 -07:00
sysfs Merge 6.9-rc5 into driver-core-next 2024-04-23 13:27:43 +02:00
sysv sysv: remove SLAB_MEM_SPREAD flag usage 2024-02-27 11:21:31 +01:00
tracefs eventfs: Do not use attributes for events directory 2024-05-23 09:31:50 -04:00
ubifs This pull request contains updates for UBI and UBIFS: 2024-03-21 15:09:29 -07:00
udf udf: Use a folio in udf_write_end() 2024-04-23 15:37:02 +02:00
ufs mm, slab: remove last vestiges of SLAB_MEM_SPREAD 2024-03-12 20:32:19 -07:00
unicode kbuild: use $(src) instead of $(srctree)/$(src) for source directory 2024-05-10 04:34:52 +09:00
vboxsf vboxsf: explicitly deny setlease attempts 2024-04-03 16:06:39 +02:00
verity fsverity: use register_sysctl_init() to avoid kmemleak warning 2024-05-03 08:30:58 -07:00
xfs tracing/treewide: Remove second parameter of __assign_str() 2024-05-22 20:14:47 -04:00
zonefs zonefs: Use str_plural() to fix Coccinelle warning 2024-04-10 07:23:47 +09:00
aio.c Assorted commits that had missed the last merge window... 2024-05-21 13:11:44 -07:00
anon_inodes.c fs: Create anon_inode_getfile_fmode() 2024-04-26 10:33:05 +02:00
attr.c fs: Export in_group_or_capable() 2024-06-25 11:15:48 +02:00
backing-file.c ovl: implement tmpfile 2024-05-02 20:35:57 +02:00
bad_inode.c
binfmt_elf.c fs: don't block i_writecount during exec 2024-06-03 15:52:10 +02:00
binfmt_elf_fdpic.c fs: don't block i_writecount during exec 2024-06-03 15:52:10 +02:00
binfmt_elf_test.c
binfmt_flat.c
binfmt_misc.c fs: don't block i_writecount during exec 2024-06-03 15:52:10 +02:00
binfmt_script.c
buffer.c bd_inode series 2024-05-21 09:51:42 -07:00
char_dev.c
compat_binfmt_elf.c
coredump.c virtio: features, fixes, cleanups 2024-05-23 12:04:36 -07:00
d_path.c
dax.c dax: use huge_zero_folio 2024-04-25 20:56:20 -07:00
dcache.c vfs: replace WARN(down_read_trylock, ...) abuse with proper asserts 2024-06-03 15:45:47 +02:00
direct-io.c fs/direct-io: remove redundant assignment to variable retval 2024-04-11 10:21:24 +02:00
drop_caches.c
eventfd.c eventfd: strictly check the count parameter of eventfd_write to avoid inputting illegal strings 2024-02-08 10:12:26 +01:00
eventpoll.c epoll: be better about file lifetimes 2024-05-05 14:00:48 -07:00
exec.c fs: don't block i_writecount during exec 2024-06-03 15:52:10 +02:00
fcntl.c fcntl: add F_DUPFD_QUERY fcntl() 2024-05-10 08:26:31 +02:00
fhandle.c fhandle: relax open_by_handle_at() permission checks 2024-05-28 15:57:23 +02:00
file.c get_file_rcu(): no need to check for NULL separately 2024-04-15 16:03:24 -04:00
file_table.c lsm/stable-6.9 PR 20240312 2024-03-12 20:03:34 -07:00
filesystems.c
fs-writeback.c fs/writeback: remove unnecessary return in writeback_inodes_sb 2024-04-05 15:53:45 +02:00
fs_context.c
fs_parser.c __fs_parse: Correct a documentation comment 2024-02-02 13:11:50 +01:00
fs_pin.c
fs_struct.c
fs_types.c
fsopen.c vfs: retire user_path_at_empty and drop empty arg from getname_flags 2024-06-05 17:03:57 +02:00
init.c
inode.c fs: Export in_group_or_capable() 2024-06-25 11:15:48 +02:00
internal.h vfs: support statx(..., NULL, AT_EMPTY_PATH, ...) 2024-06-27 18:31:20 +02:00
ioctl.c fs/ioctl: Add a comment to keep the logic in sync with LSM policies 2024-05-13 06:58:35 +02:00
Kconfig - Sumanth Korikkar has taught s390 to allocate hotplug-time page frames 2024-03-14 17:43:30 -07:00
Kconfig.binfmt
kernel_read_file.c
libfs.c shmem: Fix shmem_rename2() 2024-04-17 13:49:44 +02:00
locks.c filelock: fix deadlock detection in POSIX locking 2024-02-20 09:53:33 +01:00
Makefile vfs-6.9.pidfd 2024-03-11 10:21:06 -07:00
mbcache.c vfs: remove SLAB_MEM_SPREAD flag usage 2024-02-27 11:21:31 +01:00
mnt_idmapping.c fs/mnt_idmapping.c: Return -EINVAL when no map is written 2024-02-08 10:12:37 +01:00
mount.h fhandle: relax open_by_handle_at() permission checks 2024-05-28 15:57:23 +02:00
mpage.c block, fs: Restore the per-bio/request data lifetime fields 2024-02-06 14:31:05 +01:00
namei.c fs: reflow may_create_in_sticky() 2024-06-27 18:31:17 +02:00
namespace.c vfs: support statx(..., NULL, AT_EMPTY_PATH, ...) 2024-06-27 18:31:20 +02:00
nsfs.c pidfs: remove config option 2024-03-13 12:53:53 -07:00
open.c vfs: remove redundant smp_mb for thp handling in do_dentry_open 2024-06-25 11:15:48 +02:00
pidfs.c fs/pidfs: make 'lsof' happy with our inode changes 2024-05-21 08:08:00 -07:00
pipe.c fs/pipe: Convert to lockdep_cmp_fn 2024-02-02 13:11:49 +01:00
pnode.c
pnode.h
posix_acl.c lsm/stable-6.9 PR 20240312 2024-03-12 20:03:34 -07:00
proc_namespace.c
read_write.c Assorted commits that had missed the last merge window... 2024-05-21 13:11:44 -07:00
readdir.c readdir: Add missing quote in macro comment 2024-06-03 15:49:26 +02:00
remap_range.c vfs: export remap and write check helpers 2024-04-15 14:54:13 -07:00
select.c fs/select: rework stack allocation hack for clang 2024-02-20 09:23:52 +01:00
seq_file.c seq_file: Simplify __seq_puts() 2024-05-02 16:28:20 +02:00
signalfd.c signalfd: convert to ->read_iter() 2024-04-10 16:23:04 -06:00
splice.c remove call_{read,write}_iter() functions 2024-04-15 16:03:25 -04:00
stack.c
stat.c vfs: support statx(..., NULL, AT_EMPTY_PATH, ...) 2024-06-27 18:31:20 +02:00
statfs.c
super.c \n 2024-05-20 12:31:43 -07:00
sync.c
sysctls.c
timerfd.c timerfd: convert to ->read_iter() 2024-04-10 16:23:02 -06:00
userfaultfd.c The usual shower of singleton fixes and minor series all over MM, 2024-05-19 09:21:03 -07:00
utimes.c
xattr.c evm: Move to LSM infrastructure 2024-02-15 23:43:47 -05:00