Jeff Layton 45ab3fb2a2 locks: add new fcntl cmd values for handling file private locks ... Due to some unfortunate history, POSIX locks have very strange and unhelpful semantics. The thing that usually catches people by surprise is that they are dropped whenever the process closes any file descriptor associated with the inode. This is extremely problematic for people developing file servers that need to implement byte-range locks. Developers often need a "lock management" facility to ensure that file descriptors are not closed until all of the locks associated with the inode are finished. Additionally, "classic" POSIX locks are owned by the process. Locks taken between threads within the same process won't conflict with one another, which renders them useless for synchronization between threads. This patchset adds a new type of lock that attempts to address these issues. These locks conflict with classic POSIX read/write locks, but have semantics that are more like BSD locks with respect to inheritance and behavior on close. This is implemented primarily by changing how fl_owner field is set for these locks. Instead of having them owned by the files_struct of the process, they are instead owned by the filp on which they were acquired. Thus, they are inherited across fork() and are only released when the last reference to a filp is put. These new semantics prevent them from being merged with classic POSIX locks, even if they are acquired by the same process. These locks will also conflict with classic POSIX locks even if they are acquired by the same process or on the same file descriptor. The new locks are managed using a new set of cmd values to the fcntl() syscall. The initial implementation of this converts these values to "classic" cmd values at a fairly high level, and the details are not exposed to the underlying filesystem. We may eventually want to push this handing out to the lower filesystem code but for now I don't see any need for it. Also, note that with this implementation the new cmd values are only available via fcntl64() on 32-bit arches. There's little need to add support for legacy apps on a new interface like this. Signed-off-by: Jeff Layton <jlayton@redhat.com> Change-Id: I35691bdfed9cadcbbcb6ff6804d9eea1db661ddc		2021-01-24 09:56:22 +00:00
..
9p	fs: make posix_acl_create more useful	2020-12-07 21:02:49 +03:00
adfs	fs: push sync_filesystem() down to the file system's remount_fs()	2020-11-29 16:11:45 +03:00
affs	fs: push sync_filesystem() down to the file system's remount_fs()	2020-11-29 16:11:45 +03:00
afs	don't pass nameidata to ->create()	2018-12-07 22:28:00 +04:00
autofs4	stop passing nameidata to ->lookup()	2018-12-07 22:26:28 +04:00
befs	fs: push sync_filesystem() down to the file system's remount_fs()	2020-11-29 16:11:45 +03:00
bfs	don't pass nameidata to ->create()	2018-12-07 22:28:00 +04:00
btrfs	fs: make posix_acl_create more useful	2020-12-07 21:02:49 +03:00
cachefiles	don't pass nameidata * to vfs_create()	2018-12-07 22:28:48 +04:00
ceph	mm: kill vma flag VM_CAN_NONLINEAR	2020-11-29 16:11:40 +03:00
cifs	fs: push sync_filesystem() down to the file system's remount_fs()	2020-11-29 16:11:45 +03:00
coda	fs: push sync_filesystem() down to the file system's remount_fs()	2020-11-29 16:11:45 +03:00
configfs	stop passing nameidata to ->lookup()	2018-12-07 22:26:28 +04:00
cramfs	fs: push sync_filesystem() down to the file system's remount_fs()	2020-11-29 16:11:45 +03:00
crypto	ext4/fscrypto: avoid RCU lookup in d_revalidate	2016-10-29 23:12:37 +08:00
debugfs	fs: push sync_filesystem() down to the file system's remount_fs()	2020-11-29 16:11:45 +03:00
devpts	fs: push sync_filesystem() down to the file system's remount_fs()	2020-11-29 16:11:45 +03:00
dlm
ecryptfs	don't pass nameidata * to vfs_create()	2018-12-07 22:28:48 +04:00
efs	fs: push sync_filesystem() down to the file system's remount_fs()	2020-11-29 16:11:45 +03:00
exofs	don't pass nameidata to ->create()	2018-12-07 22:28:00 +04:00
exportfs	move d_rcu from overlapping d_child to overlapping d_alias	2017-09-22 19:11:55 +03:00
ext2	fs: make posix_acl_create more useful	2020-12-07 21:02:49 +03:00
ext3	fs: make posix_acl_create more useful	2020-12-07 21:02:49 +03:00
ext4	fs: make posix_acl_create more useful	2020-12-07 21:02:49 +03:00
f2fs	fs: make posix_acl_create more useful	2020-12-07 21:02:49 +03:00
fat	fs: push sync_filesystem() down to the file system's remount_fs()	2020-11-29 16:11:45 +03:00
freevxfs	fs: push sync_filesystem() down to the file system's remount_fs()	2020-11-29 16:11:45 +03:00
fscache	lib/radix-tree.c: make radix_tree_node_alloc() work correctly within interrupt	2020-12-07 21:02:05 +03:00
fuse	fs: push sync_filesystem() down to the file system's remount_fs()	2020-11-29 16:11:45 +03:00
gfs2	fs: make posix_acl_create more useful	2020-12-07 21:02:49 +03:00
hfs	fs: push sync_filesystem() down to the file system's remount_fs()	2020-11-29 16:11:45 +03:00
hfsplus	fs: push sync_filesystem() down to the file system's remount_fs()	2020-11-29 16:11:45 +03:00
hostfs	don't pass nameidata to ->create()	2018-12-07 22:28:00 +04:00
hpfs	fs: push sync_filesystem() down to the file system's remount_fs()	2020-11-29 16:11:45 +03:00
hppfs	stop passing nameidata to ->lookup()	2018-12-07 22:26:28 +04:00
hugetlbfs	don't pass nameidata to ->create()	2018-12-07 22:28:00 +04:00
isofs	stop passing nameidata to ->lookup()	2018-12-07 22:26:28 +04:00
jbd
jbd2	jbd2: Fix unreclaimed pages after truncate in data=journal mode	2016-10-26 23:15:34 +08:00
jffs2	fs: make posix_acl_create more useful	2020-12-07 21:02:49 +03:00
jfs	fs: make posix_acl_create more useful	2020-12-07 21:02:49 +03:00
lockd	lockd: Try to reconnect if statd has moved	2015-02-02 17:04:42 +08:00
logfs	don't pass nameidata to ->create()	2018-12-07 22:28:00 +04:00
minix	fs: push sync_filesystem() down to the file system's remount_fs()	2020-11-29 16:11:45 +03:00
ncpfs	fs: push sync_filesystem() down to the file system's remount_fs()	2020-11-29 16:11:45 +03:00
nfs	fs: Limit sys_mount to only request filesystem modules.	2020-12-14 20:34:05 +01:00
nfs_common
nfsd	userns: Pass a userns parameter into posix_acl_to_xattr and posix_acl_from_xattr	2020-12-07 21:02:21 +03:00
nilfs2	fs: push sync_filesystem() down to the file system's remount_fs()	2020-11-29 16:11:45 +03:00
nls
notify	fanotify: check file flags passed in fanotify_init	2018-12-07 22:28:48 +04:00
ntfs	fs: push sync_filesystem() down to the file system's remount_fs()	2020-11-29 16:11:45 +03:00
ocfs2	fs: make posix_acl_create more useful	2020-12-07 21:02:49 +03:00
omfs	don't pass nameidata to ->create()	2018-12-07 22:28:00 +04:00
openpromfs	fs: push sync_filesystem() down to the file system's remount_fs()	2020-11-29 16:11:45 +03:00
proc	fs: push sync_filesystem() down to the file system's remount_fs()	2020-11-29 16:11:45 +03:00
pstore	fs: push sync_filesystem() down to the file system's remount_fs()	2020-11-29 16:11:45 +03:00
qnx4	fs: push sync_filesystem() down to the file system's remount_fs()	2020-11-29 16:11:45 +03:00
qnx6	fs: push sync_filesystem() down to the file system's remount_fs()	2020-11-29 16:11:45 +03:00
quota	vfs: define struct filename and have getname() return it	2018-12-07 22:28:48 +04:00
ramfs	don't pass nameidata to ->create()	2018-12-07 22:28:00 +04:00
reiserfs	fs: make posix_acl_create more useful	2020-12-07 21:02:49 +03:00
romfs	fs: push sync_filesystem() down to the file system's remount_fs()	2020-11-29 16:11:45 +03:00
sdcardfs	mm: kill vma flag VM_CAN_NONLINEAR	2020-11-29 16:11:40 +03:00
squashfs	fs: push sync_filesystem() down to the file system's remount_fs()	2020-11-29 16:11:45 +03:00
sysfs	stop passing nameidata to ->lookup()	2018-12-07 22:26:28 +04:00
sysv	fs: push sync_filesystem() down to the file system's remount_fs()	2020-11-29 16:11:45 +03:00
ubifs	fs: push sync_filesystem() down to the file system's remount_fs()	2020-11-29 16:11:45 +03:00
udf	fs: push sync_filesystem() down to the file system's remount_fs()	2020-11-29 16:11:45 +03:00
ufs	fs: push sync_filesystem() down to the file system's remount_fs()	2020-11-29 16:11:45 +03:00
xfs	fs: make posix_acl_create more useful	2020-12-07 21:02:49 +03:00
yaffs2
aio.c	Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1	2017-12-27 17:13:15 +03:00
anon_inodes.c
attr.c	Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1	2017-12-27 17:13:15 +03:00
bad_inode.c	mm/fs: remove truncate_range	2020-12-07 20:57:30 +03:00
binfmt_aout.c
binfmt_elf.c	binfmt_elf: Don't clobber passed executable's file header	2016-10-26 23:15:28 +08:00
binfmt_elf_fdpic.c
binfmt_em86.c
binfmt_flat.c
binfmt_misc.c	Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1	2017-12-27 17:13:15 +03:00
binfmt_script.c
binfmt_som.c
bio-integrity.c
bio.c	SCSI: sg: Fix user memory corruption when SG_IO is interrupted by a signal	2013-09-07 21:58:16 -07:00
block_dev.c	writeback: Fix periodic writeback after fs mount	2013-07-28 16:26:08 -07:00
buffer.c	Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1	2017-12-27 17:13:15 +03:00
char_dev.c
compat.c	locks: add new fcntl cmd values for handling file private locks	2021-01-24 09:56:22 +00:00
compat_binfmt_elf.c
compat_ioctl.c	Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1	2017-12-27 17:13:15 +03:00
dcache.c	[O_TMPFILE] it's still short a few helpers, but infrastructure should be OK now...	2018-12-07 22:28:48 +04:00
dcookies.c
direct-io.c
drop_caches.c
eventfd.c
eventpoll.c	Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1	2017-12-27 17:13:15 +03:00
exec.c	vfs: make path_openat take a struct filename pointer	2018-12-07 22:28:48 +04:00
fcntl.c	locks: add new fcntl cmd values for handling file private locks	2021-01-24 09:56:22 +00:00
fhandle.c	vfs: read file_handle only once in handle_to_path	2016-10-29 23:12:11 +08:00
fifo.c
file.c	fs/file.c:fdtable: avoid triggering OOMs from alloc_fdmem	2014-02-22 10:32:45 -08:00
file_table.c	locks: rename locks_remove_flock to locks_remove_file	2021-01-24 09:56:22 +00:00
filesystems.c	vfs: define struct filename and have getname() return it	2018-12-07 22:28:48 +04:00
fs-writeback.c	Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1	2017-12-27 17:13:15 +03:00
fs_struct.c	sdcardfs: override umask on mkdir and create	2017-09-22 19:12:02 +03:00
inode.c	mm: allow drivers to prevent new writable mappings	2020-12-07 21:08:09 +03:00
internal.h	vfs: make path_openat take a struct filename pointer	2018-12-07 22:28:48 +04:00
ioctl.c
ioprio.c	Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1	2017-12-27 17:13:15 +03:00
Kconfig	fs: remove generic_acl	2020-12-07 21:02:53 +03:00
Kconfig.binfmt
libfs.c	stop passing nameidata to ->lookup()	2018-12-07 22:26:28 +04:00
locks.c	locks: add new fcntl cmd values for handling file private locks	2021-01-24 09:56:22 +00:00
Makefile	fs: remove generic_acl	2020-12-07 21:02:53 +03:00
mbcache.c
mount.h	proc: Usable inode numbers for the namespace file descriptors.	2015-07-13 11:18:01 -07:00
mpage.c
namei.c	fs: add get_acl helper	2020-12-07 21:02:40 +03:00
namespace.c	vfs: define struct filename and have getname() return it	2018-12-07 22:28:48 +04:00
no-block.c
open.c	fs: Fix file mode for O_TMPFILE	2018-12-07 22:28:48 +04:00
pipe.c	Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1	2017-12-27 17:13:15 +03:00
pnode.c	Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1	2017-12-27 17:13:15 +03:00
pnode.h	ANDROID: mnt: remount should propagate to slaves of slaves	2017-09-22 19:12:11 +03:00
posix_acl.c	fs: NULL dereference in posix_acl_to_xattr()	2020-12-07 21:05:11 +03:00
proc_namespace.c	vfs: Allow filesystems to access their private mount data	2017-09-22 19:12:06 +03:00
read_write.c
read_write.h
readdir.c	kernel: Only expose su when daemon is running	2017-05-19 18:41:25 -06:00
select.c	Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1	2017-12-27 17:13:15 +03:00
seq_file.c	fs/seq_file: Use vmalloc by default for allocations > PAGE_SIZE	2014-11-18 15:13:24 -08:00
signalfd.c
splice.c	Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1	2017-12-27 17:13:15 +03:00
stack.c
stat.c	vfs: make O_PATH file descriptors usable for 'fstat()'	2020-11-22 01:21:34 +03:00
statfs.c	vfs: allow O_PATH file descriptors for fstatfs()	2013-10-22 09:02:25 +01:00
super.c	vmscan: remove obsolete shrink_control comment	2020-11-29 16:11:26 +03:00
sync.c	fs/sync.c: make sync_file_range(2) use WB_SYNC_NONE writeback	2017-12-31 13:02:49 +03:00
timerfd.c	timerfd: support CLOCK_BOOTTIME clock	2017-08-27 19:07:23 +03:00
utimes.c	vfs: Add setattr2 for filesystems with per mount permissions	2017-09-22 19:12:07 +03:00
xattr.c	fs, xattr: fix bug when removing a name not in xattr list	2020-12-07 21:02:30 +03:00