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Konstantin Khlebnikov cd9e2bb827 proc: use down_read_killable mmap_sem for /proc/pid/map_files 
Do not remain stuck forever if something goes wrong.  Using a killable
lock permits cleanup of stuck tasks and simplifies investigation.

It seems ->d_revalidate() could return any error (except ECHILD) to abort
validation and pass error as result of lookup sequence.

[akpm@linux-foundation.org: fix proc_map_files_lookup() return value, per Andrei]
Link: http://lkml.kernel.org/r/156007493995.3335.9595044802115356911.stgit@buzz
Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Reviewed-by: Roman Gushchin <guro@fb.com>
Reviewed-by: Cyrill Gorcunov <gorcunov@gmail.com>
Reviewed-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Michal Koutný <mkoutny@suse.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-07-12 11:05:47 -07:00
..
9p
9p: pass the correct prototype to read_cache_page
2019-07-12 11:05:43 -07:00
adfs
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
affs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
afs
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next
2019-07-11 10:55:49 -07:00
autofs
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 83
2019-05-24 17:37:52 +02:00
befs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
bfs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
btrfs
\n
2019-07-10 20:09:17 -07:00
cachefiles
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36
2019-05-24 17:27:11 +02:00
ceph
Changes to copy_file_range for 5.3 from Dave and Amir:
2019-07-10 20:32:37 -07:00
cifs
Changes to copy_file_range for 5.3 from Dave and Amir:
2019-07-10 20:32:37 -07:00
coda
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
configfs
\n
2019-07-10 20:09:17 -07:00
cramfs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
crypto
Revert "Merge tag 'keys-acl-20190703' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs"
2019-07-10 18:43:43 -07:00
debugfs
debugfs: call fsnotify_{unlink,rmdir}() hooks
2019-06-20 14:47:09 +02:00
devpts
devpts: call fsnotify_unlink() hook
2019-06-20 14:46:34 +02:00
dlm
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 398
2019-06-05 17:37:12 +02:00
ecryptfs
Revert "Merge tag 'keys-acl-20190703' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs"
2019-07-10 18:43:43 -07:00
efivarfs
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
efs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
exportfs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
ext2
\n
2019-07-10 20:27:07 -07:00
ext4
Many bug fixes and cleanups, and an optimization for case-insensitive
2019-07-10 21:06:01 -07:00
f2fs
fscrypt: support encrypting multiple filesystem blocks per page
2019-05-28 10:27:53 -07:00
fat
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282
2019-06-05 17:36:37 +02:00
freevxfs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
fscache
Revert "Merge tag 'keys-acl-20190703' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs"
2019-07-10 18:43:43 -07:00
fuse
Changes to copy_file_range for 5.3 from Dave and Amir:
2019-07-10 20:32:37 -07:00
gfs2
Some relatively minor changes for gfs2:
2019-07-10 21:20:05 -07:00
hfs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
hfsplus
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
hostfs
This pull request contains the following changes for UML:
2019-05-12 17:52:13 -04:00
hpfs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
hugetlbfs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
isofs
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 142
2019-05-30 11:25:17 -07:00
jbd2
jbd2: drop declaration of journal_sync_buffer()
2019-06-20 17:32:21 -04:00
jffs2
jffs2: pass the correct prototype to read_cache_page
2019-07-12 11:05:43 -07:00
jfs
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156
2019-05-30 11:26:35 -07:00
kernfs
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 428
2019-06-05 17:37:16 +02:00
lockd
lockd: Make two symbols static
2019-07-03 17:52:09 -04:00
minix
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
nfs
Changes to copy_file_range for 5.3 from Dave and Amir:
2019-07-10 20:32:37 -07:00
nfs_common
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
nfsd
nfsd: Make __get_nfsdfs_client() static
2019-07-09 19:36:33 -04:00
nilfs2
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
nls
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
notify
memcg, fsnotify: no oom-kill for remote memcg charging
2019-07-12 11:05:43 -07:00
ntfs
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 97
2019-05-24 17:37:53 +02:00
ocfs2
ocfs2: use kmemdup rather than duplicating its implementation
2019-07-12 11:05:41 -07:00
omfs
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 209
2019-05-30 11:29:53 -07:00
openpromfs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
orangefs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
overlayfs
SPDX update for 5.2-rc6
2019-06-21 09:58:42 -07:00
proc
proc: use down_read_killable mmap_sem for /proc/pid/map_files
2019-07-12 11:05:47 -07:00
pstore
SPDX update for 5.2-rc4
2019-06-08 12:52:42 -07:00
qnx4
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
qnx6
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
quota
\n
2019-07-10 20:27:07 -07:00
ramfs
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
reiserfs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
romfs
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
squashfs
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 499
2019-06-19 17:09:53 +02:00
sysfs
sysfs: Add sysfs_update_groups function
2019-06-03 11:58:20 +02:00
sysv
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
tracefs
\n
2019-07-10 20:09:17 -07:00
ubifs
fscrypt updates for v5.3
2019-07-10 20:51:03 -07:00
udf
\n
2019-07-10 20:27:07 -07:00
ufs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
unicode
Many bug fixes and cleanups, and an optimization for case-insensitive
2019-07-10 21:06:01 -07:00
xfs
Changes to copy_file_range for 5.3 from Dave and Amir:
2019-07-10 20:32:37 -07:00
aio.c
signal: remove the wrong signal_pending() check in restore_user_sigmask()
2019-06-29 16:43:45 +08:00
anon_inodes.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
attr.c
…
bad_inode.c
…
binfmt_aout.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
binfmt_elf_fdpic.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
binfmt_elf.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
binfmt_em86.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
binfmt_flat.c
Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu
2019-07-10 21:42:03 -07:00
binfmt_misc.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
binfmt_script.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
block_dev.c
block_dev: use bio_release_pages in bio_unmap_user
2019-06-29 09:47:31 -06:00
buffer.c
fs: fold __generic_write_end back into generic_write_end
2019-06-27 17:28:40 -07:00
char_dev.c
chardev: update comment based on the code
2019-04-02 17:49:58 +02:00
compat_binfmt_elf.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 193
2019-05-30 11:29:21 -07:00
compat_ioctl.c
…
compat.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
coredump.c
…
d_path.c
…
dax.c
Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2019-07-08 16:12:03 -07:00
dcache.c
fsnotify: move fsnotify_nameremove() hook out of d_delete()
2019-06-20 14:47:44 +02:00
dcookies.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
direct-io.c
direct-io: use bio_release_pages in dio_bio_complete
2019-06-29 09:47:31 -06:00
drop_caches.c
fs/drop_caches.c: avoid softlockups in drop_pagecache_sb()
2019-02-01 15:46:24 -08:00
eventfd.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
eventpoll.c
signal: remove the wrong signal_pending() check in restore_user_sigmask()
2019-06-29 16:43:45 +08:00
exec.c
Merge branch 'siginfo-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2019-07-08 21:48:15 -07:00
fcntl.c
fs: mark expected switch fall-throughs
2019-04-08 18:21:02 -05:00
fhandle.c
…
file_table.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
file.c
io_uring-2019-03-06
2019-03-08 14:48:40 -08:00
filesystems.c
vfs: Implement a filesystem superblock creation/configuration context
2019-02-28 03:29:26 -05:00
fs_context.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36
2019-05-24 17:27:11 +02:00
fs_parser.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36
2019-05-24 17:27:11 +02:00
fs_pin.c
…
fs_struct.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
fs_types.c
fs: common implementation of file type
2019-01-21 17:48:13 +01:00
fs-writeback.c
blkcg, writeback: dead memcgs shouldn't contribute to writeback ownership arbitration
2019-06-15 10:39:42 -06:00
fsopen.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36
2019-05-24 17:27:11 +02:00
inode.c
Changes to copy_file_range for 5.3 from Dave and Amir:
2019-07-10 20:32:37 -07:00
internal.h
fs: fold __generic_write_end back into generic_write_end
2019-06-27 17:28:40 -07:00
io_uring.c
for-5.3/block-20190708
2019-07-09 10:45:06 -07:00
ioctl.c
Remove 'type' argument from access_ok() function
2019-01-03 18:57:57 -08:00
iomap.c
New for 5.3:
2019-07-10 20:29:45 -07:00
Kconfig
fs: VALIDATE_FS_PARSER should default to n
2019-07-05 11:22:11 -04:00
Kconfig.binfmt
binfmt_flat: make support for old format binaries optional
2019-06-24 09:16:47 +10:00
libfs.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
locks.c
Highlights:
2019-07-10 21:22:43 -07:00
Makefile
Add as a feature case-insensitive directories (the casefold feature)
2019-05-07 21:12:44 -07:00
mbcache.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
mount.h
saner handling of temporary namespaces
2019-01-30 17:44:07 -05:00
mpage.c
block: remove the i argument to bio_for_each_segment_all
2019-04-30 09:26:13 -06:00
namei.c
fsnotify: add empty fsnotify_{unlink,rmdir}() hooks
2019-06-20 14:44:55 +02:00
namespace.c
vfs: move_mount: reject moving kernel internal mounts
2019-07-01 10:46:36 -04:00
no-block.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
nsfs.c
nsfs: unobfuscate
2019-04-09 19:20:57 -04:00
open.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
pipe.c
Merge branch 'page-refs' (page ref overflow)
2019-04-14 15:09:40 -07:00
pnode.c
fs/namespace: fix unprivileged mount propagation
2019-06-17 17:36:09 -04:00
pnode.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 209
2019-05-30 11:29:53 -07:00
posix_acl.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
proc_namespace.c
…
read_write.c
vfs: allow copy_file_range to copy across devices
2019-06-09 10:06:20 -07:00
readdir.c
Remove 'type' argument from access_ok() function
2019-01-03 18:57:57 -08:00
select.c
signal: remove the wrong signal_pending() check in restore_user_sigmask()
2019-06-29 16:43:45 +08:00
seq_file.c
nfsd: escape high characters in binary data
2019-07-03 17:52:50 -04:00
signalfd.c
fs: mark expected switch fall-throughs
2019-04-08 18:21:02 -05:00
splice.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
stack.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
stat.c
fs: move generic stat response attr handling to vfs_getattr_nosec
2019-02-01 01:55:45 -05:00
statfs.c
vfs: add vfs_get_fsid() helper
2019-02-07 16:38:35 +01:00
super.c
[fix] get rid of checking for absent device name in vfs_get_tree()
2019-04-28 21:34:21 -04:00
sync.c
fs/sync.c: sync_file_range(2) may use WB_SYNC_ALL writeback
2019-05-14 09:47:50 -07:00
timerfd.c
y2038: syscalls: rename y2038 compat syscalls
2019-02-07 00:13:27 +01:00
userfaultfd.c
fs/userfaultfd.c: disable irqs for fault_pending and event locks
2019-07-05 11:12:07 +09:00
utimes.c
y2038: syscalls: rename y2038 compat syscalls
2019-02-07 00:13:27 +01:00
xattr.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00