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b3caba8f7a34a2bbaf45ffc6ff3a49b70afeb192
linux/fs
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Christian Brauner b3caba8f7a pidfs: implement file handle support 
On 64-bit platforms, userspace can read the pidfd's inode in order to
get a never-repeated PID identifier. On 32-bit platforms this identifier
is not exposed, as inodes are limited to 32 bits. Instead expose the
identifier via export_fh, which makes it available to userspace via
name_to_handle_at.

In addition we implement fh_to_dentry, which allows userspace to
recover a pidfd from a pidfs file handle.

Signed-off-by: Erin Shepherd <erin.shepherd@e43.eu>
[brauner: patch heavily rewritten]
Link: https://lore.kernel.org/r/20241129-work-pidfs-file_handle-v1-6-87d803a42495@kernel.org
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Co-Developed-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
2024-12-17 09:16:17 +01:00
..
9p
fs/9p: replace functions v9fs_cache_{register|unregister} with direct calls
2024-11-16 17:23:19 +09:00
adfs
Merge patch series "adfs, affs, befs, hfs, hfsplus: convert to new mount api"
2024-10-08 14:41:53 +02:00
affs
Merge patch series "adfs, affs, befs, hfs, hfsplus: convert to new mount api"
2024-10-08 14:41:53 +02:00
afs
Merge tag 'vfs-6.12-rc6.fixes' of gitolite.kernel.org:pub/scm/linux/kernel/git/vfs/vfs
2024-11-01 07:37:10 -10:00
autofs
autofs: fix thinko in validate_dev_ioctl()
2024-10-28 13:16:56 +01:00
bcachefs
Merge tag 'mm-nonmm-stable-2024-11-24-02-05' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2024-11-25 16:09:48 -08:00
befs
befs: convert befs to use the new mount api
2024-09-18 11:44:43 +02:00
bfs
fs: Convert aops->write_begin to take a folio
2024-08-07 11:33:21 +02:00
btrfs
Merge tag 'cxl-for-6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl
2024-11-22 12:33:52 -08:00
cachefiles
cachefiles: Fix NULL pointer dereference in object->file
2024-11-11 14:39:38 +01:00
ceph
Merge tag 'ceph-for-6.13-rc1' of https://github.com/ceph/ceph-client
2024-11-30 10:22:38 -08:00
coda
coda: use param->file for FSCONFIG_SET_FD
2024-08-19 13:45:03 +02:00
configfs
configfs: improve item creation performance
2024-11-14 07:45:20 +01:00
cramfs
Merge tag 'vfs-6.11.module.description' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2024-07-15 11:14:59 -07:00
crypto
Merge tag 'random-6.13-rc1-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/crng/random
2024-11-19 10:43:44 -08:00
debugfs
debugfs: add small file operations for most files
2024-10-23 16:47:01 +02:00
devpts
…
dlm
dlm: fix dlm_recover_members refcount on error
2024-11-18 10:05:57 -06:00
ecryptfs
Merge tag 'vfs-6.13.ecryptfs.mount.api' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2024-11-26 13:39:02 -08:00
efivarfs
[tree-wide] finally take no_llseek out
2024-09-27 08:18:43 -07:00
efs
efs: fix the efs new mount api implementation
2024-10-15 15:58:36 +02:00
erofs
erofs: handle NONHEAD !delta[1] lclusters gracefully
2024-11-18 18:50:14 +08:00
exfat
exfat: reduce FAT chain traversal
2024-11-25 17:08:27 +09:00
exportfs
fs: prepare for "explicit connectable" file handles
2024-11-15 11:34:57 +01:00
ext2
Merge tag 'vfs-6.12.file' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2024-09-16 09:14:02 +02:00
ext4
Merge tag 'ext4_for_linus-6.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
2024-11-18 16:32:58 -08:00
f2fs
Merge tag 'f2fs-for-6.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs
2024-11-26 12:50:58 -08:00
fat
fat: fix uninitialized variable
2024-10-17 00:28:06 -07:00
freevxfs
freevxfs: Replace one-element array with flexible array member
2024-11-06 10:42:06 +01:00
fuse
Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
2024-11-27 13:11:58 -08:00
gfs2
Merge tag 'gfs2-for-6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2
2024-11-26 12:34:50 -08:00
hfs
hfs: convert hfs to use the new mount api
2024-10-08 14:41:46 +02:00
hfsplus
Merge tag 'vfs-6.13.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2024-11-18 09:35:30 -08:00
hostfs
hostfs: Fix the NULL vs IS_ERR() bug for __filemap_get_folio()
2024-11-15 20:55:32 +01:00
hpfs
hpfs: convert hpfs to use the new mount api
2024-10-08 14:41:53 +02:00
hugetlbfs
Merge tag 'mm-stable-2024-11-18-19-27' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2024-11-23 09:58:07 -08:00
iomap
Merge branch 'ovl.fixes'
2024-11-26 18:15:06 +01:00
isofs
isofs: avoid memory leak in iocharset
2024-11-06 20:24:41 +01:00
jbd2
jbd2: Fix comment describing journal_init_common()
2024-11-13 12:56:48 -05:00
jffs2
jffs2: Prevent rtime decompress memory corruption
2024-11-14 20:56:19 +01:00
jfs
Merge tag 'jfs-6.13' of github.com:kleikamp/linux-shaggy
2024-11-21 09:59:59 -08:00
kernfs
…
lockd
Merge tag 'nfsd-6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux
2024-11-26 12:59:30 -08:00
minix
buffer: Convert __block_write_begin() to take a folio
2024-08-07 11:33:36 +02:00
netfs
fscache: Remove duplicate included header
2024-11-21 09:35:25 +01:00
nfs
Merge tag 'nfs-for-6.13-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs
2024-11-30 10:17:53 -08:00
nfs_common
nfs_common: must not hold RCU while calling nfsd_file_put_local
2024-11-18 20:23:12 -05:00
nfsd
Merge tag 'nfsd-6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux
2024-11-26 12:59:30 -08:00
nilfs2
Merge tag 'mm-nonmm-stable-2024-11-24-02-05' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2024-11-25 16:09:48 -08:00
nls
move asm/unaligned.h to linux/unaligned.h
2024-10-02 17:23:23 -04:00
notify
Merge tag 'fsnotify_for_v6.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
2024-11-21 09:55:45 -08:00
ntfs3
fs/ntfs3: Accumulated refactoring changes
2024-11-01 11:19:53 +03:00
ocfs2
Merge tag 'mm-nonmm-stable-2024-11-24-02-05' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2024-11-25 16:09:48 -08:00
omfs
fs: Convert aops->write_begin to take a folio
2024-08-07 11:33:21 +02:00
openpromfs
openpromfs: add missing MODULE_DESCRIPTION() macro
2024-06-20 09:46:01 +02:00
orangefs
move asm/unaligned.h to linux/unaligned.h
2024-10-02 17:23:23 -04:00
overlayfs
Merge tag 'ovl-update-6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/overlayfs/vfs
2024-11-22 20:55:42 -08:00
proc
Merge tag 'vfs-6.13-rc1.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2024-11-27 08:11:46 -08:00
pstore
Merge tag 'drm-next-2024-09-19' of https://gitlab.freedesktop.org/drm/kernel
2024-09-19 10:18:15 +02:00
qnx4
qnx4: add MODULE_DESCRIPTION()
2024-05-28 11:52:53 +02:00
qnx6
qnx6: Convert directory handling to use kmap_local
2024-08-07 11:31:56 +02:00
quota
Merge tag 'reiserfs_delete' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
2024-11-21 09:50:18 -08:00
ramfs
…
romfs
romfs: fix romfs_read_folio()
2024-08-21 22:32:58 +02:00
smb
Merge tag '6.13-rc-part2-smb3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6
2024-11-30 10:14:42 -08:00
squashfs
Squashfs: fix variable overflow in squashfs_readpage_block
2024-10-30 20:14:12 -07:00
sysfs
sysfs: bin_attribute: add const read/write callback variants
2024-11-05 14:00:28 +01:00
sysv
buffer: Convert __block_write_begin() to take a folio
2024-08-07 11:33:36 +02:00
tests
execve: Move KUnit tests to tests/ subdirectory
2024-07-22 18:25:47 -07:00
tracefs
tracing: Fix tracefs mount options
2024-11-01 08:38:14 -04:00
ubifs
Merge tag 'ubifs-for-linus-6.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/ubifs
2024-11-30 10:32:47 -08:00
udf
udf: fix uninit-value use in udf_get_fileshortad
2024-10-02 14:32:37 +02:00
ufs
ufs: ufs_sb_private_info: remove unused s_{2,3}apb fields
2024-11-12 19:02:12 -05:00
unicode
Merge tag 'unicode-next-6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/krisman/unicode
2024-11-22 20:50:55 -08:00
vboxsf
fs: Convert aops->write_end to take a folio
2024-08-07 11:32:02 +02:00
verity
fsverity: expose verified fsverity built-in signatures to LSMs
2024-08-20 14:03:18 -04:00
xfs
Merge tag 'mm-stable-2024-11-18-19-27' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2024-11-23 09:58:07 -08:00
zonefs
Merge tag 'zonefs-6.12-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/dlemoal/zonefs
2024-10-02 12:02:15 -07:00
aio.c
Merge tag 'timers-core-2024-11-18' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2024-11-19 16:35:06 -08:00
anon_inodes.c
…
attr.c
fs: handle delegated timestamps in setattr_copy_mgtime
2024-10-10 10:20:51 +02:00
backing-file.c
fs/backing_file: fix wrong argument in callback
2024-11-26 18:13:29 +01:00
bad_inode.c
…
binfmt_elf_fdpic.c
Revert "fs: don't block i_writecount during exec"
2024-11-27 12:51:30 +01:00
binfmt_elf.c
Revert "fs: don't block i_writecount during exec"
2024-11-27 12:51:30 +01:00
binfmt_flat.c
move asm/unaligned.h to linux/unaligned.h
2024-10-02 17:23:23 -04:00
binfmt_misc.c
Revert "fs: don't block i_writecount during exec"
2024-11-27 12:51:30 +01:00
binfmt_script.c
fs: binfmt: add missing MODULE_DESCRIPTION() macros
2024-05-28 12:06:51 +02:00
bpf_fs_kfuncs.c
bpf: Add kfunc bpf_get_dentry_xattr() to read xattr from dentry
2024-08-07 11:26:54 -07:00
buffer.c
Merge tag 'mm-stable-2024-11-18-19-27' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2024-11-23 09:58:07 -08:00
char_dev.c
fs: Reorganize kerneldoc parameter names
2024-10-22 11:16:57 +02:00
compat_binfmt_elf.c
binfmt_elf: Wire up AT_HWCAP3 at AT_HWCAP4
2024-10-17 18:38:49 +01:00
coredump.c
coredump: add cond_resched() to dump_user_range
2024-10-22 11:16:58 +02:00
d_path.c
…
dax.c
fsdax: dax_unshare_iter needs to copy entire blocks
2024-10-07 13:51:47 +02:00
dcache.c
Merge tag 'mm-stable-2024-11-18-19-27' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2024-11-23 09:58:07 -08:00
direct-io.c
fs/direct-io: Remove linux/prefetch.h include
2024-08-19 13:45:02 +02:00
drop_caches.c
sysctl: treewide: constify the ctl_table argument of proc_handlers
2024-07-24 20:59:29 +02:00
eventfd.c
fdget(), trivial conversions
2024-11-03 01:28:06 -05:00
eventpoll.c
Merge tag 'net-next-6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next
2024-11-21 08:28:08 -08:00
exec.c
Revert "fs: don't block i_writecount during exec"
2024-11-27 12:51:30 +01:00
fcntl.c
fs: require inode_owner_or_capable for F_SET_RW_HINT
2024-11-25 15:16:49 +01:00
fhandle.c
exportfs: add permission method
2024-12-17 09:16:11 +01:00
file_table.c
Merge branch 'work.fdtable' into vfs.file
2024-10-30 09:58:02 +01:00
file.c
Merge tag 'vfs-6.13.file' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2024-11-18 10:30:29 -08:00
filesystems.c
…
fs_context.c
…
fs_parser.c
Merge tag 'vfs-6.13.ovl' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2024-11-18 10:45:06 -08:00
fs_pin.c
…
fs_struct.c
…
fs_types.c
…
fs-writeback.c
Merge patch series "two little writeback cleanups v2"
2024-11-13 14:08:34 +01:00
fsopen.c
fdget(), more trivial conversions
2024-11-03 01:28:06 -05:00
init.c
…
inode.c
Merge tag 'mm-stable-2024-11-18-19-27' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2024-11-23 09:58:07 -08:00
internal.h
Merge tag 'pull-statx' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2024-11-18 14:54:10 -08:00
ioctl.c
fdget(), trivial conversions
2024-11-03 01:28:06 -05:00
Kconfig
reiserfs: The last commit
2024-10-21 16:29:38 +02:00
Kconfig.binfmt
exec: Add KUnit test for bprm_stack_limits()
2024-06-19 13:13:55 -07:00
kernel_read_file.c
fdget(), trivial conversions
2024-11-03 01:28:06 -05:00
libfs.c
pseudofs: add support for export_ops
2024-12-14 12:40:40 +01:00
locks.c
fdget(), more trivial conversions
2024-11-03 01:28:06 -05:00
Makefile
reiserfs: The last commit
2024-10-21 16:29:38 +02:00
mbcache.c
…
mnt_idmapping.c
Merge tag 'fuse-update-6.12' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse
2024-09-24 15:29:42 -07:00
mount.h
Merge tag 'vfs-6.12.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2024-09-16 11:15:26 +02:00
mpage.c
fs/writeback: convert wbc_account_cgroup_owner to take a folio
2024-10-28 13:26:54 +01:00
namei.c
Merge tag 'pull-xattr' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2024-11-18 12:44:25 -08:00
namespace.c
statmount: fix security option retrieval
2024-11-21 09:35:31 +01:00
nsfs.c
[tree-wide] finally take no_llseek out
2024-09-27 08:18:43 -07:00
open.c
Merge tag 'fsnotify_for_v6.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
2024-11-21 09:55:45 -08:00
pidfs.c
pidfs: implement file handle support
2024-12-17 09:16:17 +01:00
pipe.c
[tree-wide] finally take no_llseek out
2024-09-27 08:18:43 -07:00
pnode.c
…
pnode.h
…
posix_acl.c
acl: Annotate struct posix_acl with __counted_by()
2024-10-22 11:16:59 +02:00
proc_namespace.c
fs: rename show_mnt_opts -> show_vfsmnt_opts
2024-06-28 14:36:43 +02:00
read_write.c
Merge tag 'pull-fd' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2024-11-18 12:24:06 -08:00
readdir.c
introduce "fd_pos" class, convert fdget_pos() users to it.
2024-11-03 01:28:06 -05:00
remap_range.c
convert vfs_dedupe_file_range().
2024-11-03 01:28:07 -05:00
select.c
do_pollfd(): convert to CLASS(fd)
2024-11-03 01:28:07 -05:00
seq_file.c
fs: Reorganize kerneldoc parameter names
2024-10-22 11:16:57 +02:00
signalfd.c
fdget(), trivial conversions
2024-11-03 01:28:06 -05:00
splice.c
fdget(), more trivial conversions
2024-11-03 01:28:06 -05:00
stack.c
…
stat.c
Merge tag 'pull-statx' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2024-11-18 14:54:10 -08:00
statfs.c
fdget_raw() users: switch to CLASS(fd_raw)
2024-11-03 01:28:06 -05:00
super.c
fs/super.c: introduce get_tree_bdev_flags()
2024-10-21 14:30:26 +02:00
sync.c
fdget(), trivial conversions
2024-11-03 01:28:06 -05:00
sysctls.c
…
timerfd.c
Merge tag 'timers-core-2024-11-18' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2024-11-19 16:35:06 -08:00
userfaultfd.c
fork: do not invoke uffd on fork if error occurs
2024-10-28 21:40:38 -07:00
utimes.c
fdget(), more trivial conversions
2024-11-03 01:28:06 -05:00
xattr.c
xattr: remove redundant check on variable err
2024-11-06 13:00:01 -05:00