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Linus Torvalds 1b074abe88 vfs-6.11.nsfs 
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Merge tag 'vfs-6.11.nsfs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

Pull namespace-fs updates from Christian Brauner:
 "This adds ioctls allowing to translate PIDs between PID namespaces.

  The motivating use-case comes from LXCFS which is a tiny fuse
  filesystem used to virtualize various aspects of procfs. LXCFS is run
  on the host. The files and directories it creates can be bind-mounted
  by e.g. a container at startup and mounted over the various procfs
  files the container wishes to have virtualized.

  When e.g. a read request for uptime is received, LXCFS will receive
  the pid of the reader. In order to virtualize the corresponding read,
  LXCFS needs to know the pid of the init process of the reader's pid
  namespace.

  In order to do this, LXCFS first needs to fork() two helper processes.
  The first helper process setns() to the readers pid namespace. The
  second helper process is needed to create a process that is a proper
  member of the pid namespace.

  The second helper process then creates a ucred message with ucred.pid
  set to 1 and sends it back to LXCFS. The kernel will translate the
  ucred.pid field to the corresponding pid number in LXCFS's pid
  namespace. This way LXCFS can learn the init pid number of the
  reader's pid namespace and can go on to virtualize.

  Since these two forks() are costly LXCFS maintains an init pid cache
  that caches a given pid for a fixed amount of time. The cache is
  pruned during new read requests. However, even with the cache the hit
  of the two forks() is singificant when a very large number of
  containers are running.

  So this adds a simple set of ioctls that let's a caller translate PIDs
  from and into a given PID namespace. This significantly improves
  performance with a very simple change.

  To protect against races pidfds can be used to check whether the
  process is still valid"

* tag 'vfs-6.11.nsfs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs:
  nsfs: add pid translation ioctls
2024-07-15 12:27:39 -07:00
..
9p Two fixes headed to stable trees: 2024-05-29 09:25:15 -07:00
adfs
affs
afs afs: Convert comma to semicolon 2024-07-02 21:23:00 +02:00
autofs vfs-6.11.mount.api 2024-07-15 11:31:32 -07:00
bcachefs vfs-6.11.inode 2024-07-15 11:39:44 -07:00
befs befs: Convert befs_symlink_read_folio() to use folio_end_read() 2024-05-31 12:31:39 +02:00
bfs
btrfs vfs-6.11.inode 2024-07-15 11:39:44 -07:00
cachefiles Merge patch series "cachefiles: random bugfixes" 2024-07-05 18:40:40 +02:00
ceph We have a series from Xiubo that adds support for additional access 2024-05-25 14:23:58 -07:00
coda coda: Convert coda_symlink_filler() to use folio_end_read() 2024-05-31 12:31:39 +02:00
configfs
cramfs vfs-6.11.module.description 2024-07-15 11:14:59 -07:00
crypto The usual shower of singleton fixes and minor series all over MM, 2024-05-19 09:21:03 -07:00
debugfs vfs-6.11.mount.api 2024-07-15 11:31:32 -07:00
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 efivarfs: Convert to new uid/gid option parsing helpers 2024-07-02 06:21:18 +02:00
efs vfs-6.11.module.description 2024-07-15 11:14:59 -07:00
erofs erofs: ensure m_llen is reset to 0 if metadata is invalid 2024-06-30 10:54:28 +08:00
exfat exfat: Convert to new uid/gid option parsing helpers 2024-07-02 06:21:18 +02:00
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 vfs-6.11.mount.api 2024-07-15 11:31:32 -07:00
f2fs vfs-6.11.casefold 2024-07-15 11:18:49 -07:00
fat vfs-6.11.mount.api 2024-07-15 11:31:32 -07:00
freevxfs freevxfs: Convert freevxfs to the new mount API. 2024-03-26 09:04:53 +01:00
fuse vfs-6.11.mount.api 2024-07-15 11:31:32 -07:00
gfs2 bd_inode series 2024-05-21 09:51:42 -07:00
hfs vfs-6.11.module.description 2024-07-15 11:14:59 -07:00
hfsplus vfs-6.11.misc 2024-07-15 10:52:51 -07:00
hostfs vfs-6.11.mount.api 2024-07-15 11:31:32 -07:00
hpfs vfs-6.11.module.description 2024-07-15 11:14:59 -07:00
hugetlbfs hugetlbfs: Convert to new uid/gid option parsing helpers 2024-07-02 06:21:19 +02:00
iomap vfs-6.11.pg_error 2024-07-15 11:08:14 -07:00
isofs vfs-6.11.mount.api 2024-07-15 11:31:32 -07:00
jbd2 bd_inode series 2024-05-21 09:51:42 -07:00
jffs2 jffs2: Remove calls to set/clear the folio error flag 2024-05-31 12:31:41 +02:00
jfs jfs: xattr: fix buffer overflow for invalid xattr 2024-06-04 18:09:03 +02:00
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 vfs-6.11.module.description 2024-07-15 11:14:59 -07:00
netfs vfs-6.10-rc8.fixes 2024-07-11 09:03:28 -07:00
nfs vfs-6.11.pg_error 2024-07-15 11:08:14 -07:00
nfs_common
nfsd vfs-6.11.misc 2024-07-15 10:52:51 -07:00
nilfs2 nilfs2: fix kernel bug on rename operation of broken directory 2024-07-03 22:40:38 -07:00
nls fs: nls: add missing MODULE_DESCRIPTION() macros 2024-06-03 16:37:07 +02:00
notify Revert "fanotify: remove unneeded sub-zero check for unsigned value" 2024-05-20 12:43:58 -07:00
ntfs3 ntfs3: Convert to new uid/gid option parsing helpers 2024-07-02 06:21:19 +02:00
ocfs2 ocfs2: fix DIO failure due to insufficient transaction credits 2024-06-24 20:52:10 -07:00
omfs
openpromfs openpromfs: add missing MODULE_DESCRIPTION() macro 2024-06-20 09:46:01 +02:00
orangefs orangefs: Remove calls to set/clear the error flag 2024-05-31 12:31:41 +02:00
overlayfs ovl: fix encoding fid for lower only root 2024-06-14 10:30:40 +02:00
proc vfs-6.11.misc 2024-07-15 10:52:51 -07:00
pstore
qnx4 qnx4: add MODULE_DESCRIPTION() 2024-05-28 11:52:53 +02:00
qnx6 qnx6: add MODULE_DESCRIPTION() 2024-05-28 11:52:49 +02:00
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 reiserfs: Remove call to folio_set_error() 2024-05-31 12:31:41 +02:00
romfs romfs: Convert romfs_read_folio() to use a folio 2024-05-31 12:31:42 +02:00
smb vfs-6.11.mount.api 2024-07-15 11:31:32 -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 fs: sysv: add MODULE_DESCRIPTION() 2024-05-28 11:52:45 +02:00
tracefs tracefs: Convert to new uid/gid option parsing helpers 2024-07-02 06:21:20 +02:00
ubifs
udf udf: Use a folio in udf_write_end() 2024-04-23 15:37:02 +02:00
ufs ufs: Remove call to set the folio error flag 2024-05-31 12:31:42 +02:00
unicode kbuild: use $(src) instead of $(srctree)/$(src) for source directory 2024-05-10 04:34:52 +09:00
vboxsf vfs-6.11.mount.api 2024-07-15 11:31:32 -07:00
verity fsverity: use register_sysctl_init() to avoid kmemleak warning 2024-05-03 08:30:58 -07:00
xfs vfs-6.11.inode 2024-07-15 11:39:44 -07:00
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_fdpic.c fs: don't block i_writecount during exec 2024-06-03 15:52:10 +02:00
binfmt_elf_test.c
binfmt_elf.c fs: don't block i_writecount during exec 2024-06-03 15:52:10 +02:00
binfmt_flat.c
binfmt_misc.c vfs-6.11.module.description 2024-07-15 11:14:59 -07:00
binfmt_script.c fs: binfmt: add missing MODULE_DESCRIPTION() macros 2024-05-28 12:06:51 +02:00
buffer.c buffer: Remove calls to set and clear the folio error flag 2024-05-31 12:31:43 +02:00
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-6.11.misc 2024-07-15 10:52:51 -07:00
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
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_table.c
file.c fs/file: fix the check in find_next_fd() 2024-05-30 09:11:47 +02:00
filesystems.c
fs_context.c
fs_parser.c fs_parse: add uid & gid option option parsing helpers 2024-07-02 06:20:49 +02:00
fs_pin.c
fs_struct.c
fs_types.c
fs-writeback.c fs/writeback: remove unnecessary return in writeback_inodes_sb 2024-04-05 15:53:45 +02:00
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 vfs-6.11.inode 2024-07-15 11:39:44 -07:00
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
Kconfig.binfmt
kernel_read_file.c
libfs.c libfs: Introduce case-insensitive string comparison helper 2024-06-07 17:00:44 +02:00
locks.c vfs-6.10-rc8.fixes 2024-07-11 09:03:28 -07:00
Makefile
mbcache.c
mnt_idmapping.c
mount.h vfs-6.11.mount 2024-07-15 11:54:04 -07:00
mpage.c buffer: Remove calls to set and clear the folio error flag 2024-05-31 12:31:43 +02:00
namei.c vfs-6.11.misc 2024-07-15 10:52:51 -07:00
namespace.c vfs-6.11.mount 2024-07-15 11:54:04 -07:00
nsfs.c vfs-6.11.nsfs 2024-07-15 12:27:39 -07:00
open.c vfs-6.11.misc 2024-07-15 10:52:51 -07:00
pidfs.c fs/pidfs: make 'lsof' happy with our inode changes 2024-05-21 08:08:00 -07:00
pipe.c
pnode.c
pnode.h
posix_acl.c
proc_namespace.c fs: rename show_mnt_opts -> show_vfsmnt_opts 2024-06-28 14:36:43 +02:00
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
seq_file.c seq_file: Simplify __seq_puts() 2024-05-02 16:28:20 +02:00
signalfd.c signalfd: drop an obsolete comment 2024-05-24 13:34:07 +02:00
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 fs: don't misleadingly warn during thaw operations 2024-06-18 16:20:47 +02:00
sync.c
sysctls.c
timerfd.c timerfd: convert to ->read_iter() 2024-04-10 16:23:02 -06:00
userfaultfd.c Fix userfaultfd_api to return EINVAL as expected 2024-07-03 22:40:36 -07:00
utimes.c
xattr.c