Jeff Layton 5d50ffd7c3 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>		2014-03-31 08:24:43 -04:00
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9p	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2014-01-28 08:38:04 -08:00
adfs	adfs: delayed freeing of sbi	2013-10-24 23:43:27 -04:00
affs	affs: use ->kill_sb() to simplify ->put_super() and failure exits of ->mount()	2014-01-25 03:13:01 -05:00
afs	afs: proc cells and rootcell are writeable	2014-02-01 10:59:39 -08:00
autofs4	autofs: fix symlinks aren't checked for expiry	2014-01-23 16:36:59 -08:00
befs	befs: iget_locked() doesn't return an ERR_PTR	2014-01-25 03:14:38 -05:00
bfs	truncate: drop 'oldsize' truncate_pagecache() parameter	2013-09-12 15:38:02 -07:00
btrfs	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs	2014-01-30 20:08:20 -08:00
cachefiles	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2013-11-13 15:34:18 +09:00
ceph	ceph: fix missing dput in ceph_set_acl	2014-01-31 08:14:06 -08:00
cifs	cifs: Fix check for regular file in couldbe_mf_symlink()	2014-01-31 09:06:43 -06:00
coda	coda_revalidate_inode(): switch to passing inode...	2013-11-09 00:16:21 -05:00
configfs	configfs: fix race between dentry put and lookup	2013-11-21 16:42:27 -08:00
cramfs	cramfs: take headers to fs/cramfs	2014-01-25 03:13:02 -05:00
debugfs	debugfs: use list_next_entry() in debugfs_remove_recursive()	2013-11-13 12:09:24 +09:00
devpts	devpts: plug the memory leak in kill_sb	2013-11-13 12:09:36 +09:00
dlm	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2014-01-25 11:17:34 -08:00
ecryptfs	ecryptfs: fix failure handling in ->readlink()	2014-01-25 03:13:00 -05:00
efivarfs	consolidate simple ->d_delete() instances	2013-11-15 22:04:17 -05:00
efs	efs: get rid of ->put_super()	2014-01-25 03:13:02 -05:00
exofs	exofs: Print less in r4w	2014-01-23 18:54:14 +02:00
exportfs	exportfs: fix quadratic behavior in filehandle lookup	2013-11-09 00:16:38 -05:00
ext2	ext2/3/4: use generic posix ACL infrastructure	2014-01-25 23:58:19 -05:00
ext3	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2014-01-28 08:38:04 -08:00
ext4	Merge branch 'for-3.14/core' of git://git.kernel.dk/linux-block	2014-01-30 11:19:05 -08:00
f2fs	Merge branch 'for-3.14/core' of git://git.kernel.dk/linux-block	2014-01-30 11:19:05 -08:00
fat	fat: rcu-delay unloading nls and freeing sbi	2013-10-24 23:43:28 -04:00
freevxfs	[readdir] convert freevxfs	2013-06-29 12:56:53 +04:00
fscache	Merge branch 'for-3.13/core' of git://git.kernel.dk/linux-block	2013-11-14 12:08:14 +09:00
fuse	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2014-01-28 08:38:04 -08:00
gfs2	Merge branch 'for-3.14/core' of git://git.kernel.dk/linux-block	2014-01-30 11:19:05 -08:00
hfs	fs/hfs/btree.h: remove duplicate defines	2013-11-13 12:09:32 +09:00
hfsplus	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2014-02-01 10:43:45 -08:00
hostfs	um: hostfs: make functions static	2014-01-26 11:51:09 +01:00
hpfs	hpfs: optimize quad buffer loading	2014-02-02 16:24:07 -08:00
hppfs	clean up scary strncpy(dst, src, strlen(src)) uses	2013-07-03 16:07:41 -07:00
hugetlbfs	cope with potentially long ->d_dname() output for shmem/hugetlb	2013-08-24 12:10:17 -04:00
isofs	isofs: don't pass dentry to isofs_hash{i,}_common()	2013-10-24 23:34:59 -04:00
jbd	jbd: Revise KERN_EMERG error messages	2013-12-04 12:27:46 +01:00
jbd2	jbd2: rename obsoleted msg JBD->JBD2	2013-12-08 21:14:59 -05:00
jffs2	MTD updates for 3.14:	2014-01-28 18:56:37 -08:00
jfs	Minor bug fix for linux-3.14	2014-01-31 08:14:35 -08:00
kernfs	kernfs: associate a new kernfs_node with its parent on creation	2014-01-17 11:50:07 -08:00
lockd	LOCKD: Don't call utsname()->nodename from nlmclnt_setlockargs	2013-08-05 15:03:46 -04:00
logfs	Merge branch 'for-3.14/core' of git://git.kernel.dk/linux-block	2014-01-30 11:19:05 -08:00
minix	fs/minix: Drop dependency on H8300	2013-09-16 18:20:25 -07:00
ncpfs	ncpfs: rcu-delay unload_nls() and freeing ncp_server	2013-10-24 23:43:28 -04:00
nfs	NFS client bugfixes for Linux 3.14	2014-01-31 15:39:07 -08:00
nfs_common
nfsd	Merge branch 'for-3.14' of git://linux-nfs.org/~bfields/linux	2014-01-30 10:18:43 -08:00
nilfs2	Merge branch 'for-3.14/core' of git://git.kernel.dk/linux-block	2014-01-30 11:19:05 -08:00
nls	nls: have register_nls() set ->owner	2014-01-25 03:14:05 -05:00
notify	fanotify: Fix use after free for permission events	2014-01-29 13:57:17 +01:00
ntfs	iget/iget5: don't bother with ->i_lock until we find a match	2013-11-09 00:16:31 -05:00
ocfs2	Merge branch 'for-3.14/core' of git://git.kernel.dk/linux-block	2014-01-30 11:19:05 -08:00
omfs	truncate: drop 'oldsize' truncate_pagecache() parameter	2013-09-12 15:38:02 -07:00
openpromfs	[readdir] convert openpromfs	2013-06-29 12:56:32 +04:00
proc	fs/proc/array.c: change do_task_stat() to use while_each_thread()	2014-01-23 16:37:02 -08:00
pstore	pstore: Don't allow high traffic options on fragile devices	2013-12-20 13:12:01 -08:00
qnx4	qnx4: clean qnx4_fill_super() up	2014-01-25 03:13:03 -05:00
qnx6	[readdir] convert qnx6	2013-06-29 12:56:39 +04:00
quota	genetlink: make multicast groups const, prevent abuse	2013-11-19 16:39:06 -05:00
ramfs	fs/ramfs: move ramfs_aops to inode.c	2014-01-23 16:36:58 -08:00
reiserfs	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2014-01-28 08:38:04 -08:00
romfs	romfs: fix returm err while getting inode in fill_super	2014-01-23 16:37:04 -08:00
squashfs	Squashfs: fix failure to unlock pages on decompress error	2013-11-24 01:02:50 +00:00
sysfs	Revert "kernfs, sysfs, driver-core: implement kernfs_remove_self() and its wrappers"	2014-01-13 14:05:13 -08:00
sysv	sysv: Add forgotten superblock lock init for v7 fs	2013-09-29 22:02:02 -04:00
ubifs	fs/ubifs: use rbtree postorder iteration helper instead of opencoding	2014-01-23 16:37:03 -08:00
udf	udf: Fix lockdep warning from udf_symlink()	2013-12-23 22:02:16 +01:00
ufs	truncate: drop 'oldsize' truncate_pagecache() parameter	2013-09-12 15:38:02 -07:00
xfs	Merge branch 'for-3.14/core' of git://git.kernel.dk/linux-block	2014-01-30 11:19:05 -08:00
aio.c	Merge git://git.kvack.org/~bcrl/aio-next	2013-12-22 11:03:49 -08:00
anon_inodes.c	... and kill anon_inode_getfile_private()	2013-11-09 00:16:28 -05:00
attr.c	fs: fix iversion handling	2013-12-05 16:36:21 -06:00
bad_inode.c	[readdir] ->readdir() is gone	2013-06-29 12:57:04 +04:00
binfmt_aout.c	dump_skip(): dump_seek() replacement taking coredump_params	2013-11-09 00:16:26 -05:00
binfmt_elf_fdpic.c	elf{,_fdpic} coredump: get rid of pointless if (siginfo->si_signo)	2013-11-09 00:16:30 -05:00
binfmt_elf.c	fs: binfmt_elf: remove unused defines INTERPRETER_NONE and INTERPRETER_ELF	2014-01-23 16:36:58 -08:00
binfmt_em86.c	file->f_op is never NULL...	2013-10-24 23:34:54 -04:00
binfmt_flat.c
binfmt_misc.c
binfmt_script.c
binfmt_som.c
bio-integrity.c	bio-integrity: Fix bio_integrity_verify segment start bug	2014-01-21 20:32:05 -08:00
bio.c	Revert "block: Warn and free bio if bi_end_io is not set"	2014-01-08 14:14:22 -07:00
block_dev.c	a trivial writeback fix	2013-09-13 23:06:40 -04:00
buffer.c	block: Replace __this_cpu_ptr with raw_cpu_ptr	2013-12-03 19:19:41 -07:00
char_dev.c	Merge branch 'for-3.13/core' of git://git.kernel.dk/linux-block	2013-11-14 12:08:14 +09:00
compat_binfmt_elf.c
compat_ioctl.c	fs/compat_ioctl.c: fix an underflow issue (harmless)	2014-01-21 16:19:42 -08:00
compat.c	locks: add new fcntl cmd values for handling file private locks	2014-03-31 08:24:43 -04:00
coredump.c	coredump: make __get_dumpable/get_dumpable inline, kill fs/coredump.h	2014-01-23 16:37:01 -08:00
dcache.c	__dentry_path() fixes	2014-01-26 12:37:55 -05:00
dcookies.c	fs/compat: fix lookup_dcookie() parameter handling	2014-01-29 16:22:40 -08:00
direct-io.c	block: Abstract out bvec iterator	2013-11-23 22:33:47 -08:00
drop_caches.c	shrinker: add node awareness	2013-09-10 18:56:31 -04:00
eventfd.c	eventfd_ctx_fdget(): use fdget() instead of fget()	2014-01-25 03:13:04 -05:00
eventpoll.c	epoll: do not take the nested ep->mtx on EPOLL_CTL_DEL	2014-01-02 14:40:30 -08:00
exec.c	fs/exec.c: call arch_pick_mmap_layout() only once	2014-01-23 16:37:02 -08:00
fcntl.c	locks: add new fcntl cmd values for handling file private locks	2014-03-31 08:24:43 -04:00
fhandle.c
file_table.c	locks: rename locks_remove_flock to locks_remove_file	2014-03-31 08:24:42 -04:00
file.c	fs: __fget_light() can use __fget() in slow path	2014-01-25 03:14:38 -05:00
filesystems.c
fs_struct.c	seqcount: Add lockdep functionality to seqcount/seqlock structures	2013-11-06 12:40:26 +01:00
fs-writeback.c	writeback: Fix data corruption on NFS	2013-12-14 04:21:26 +08:00
inode.c	locks: break delegations on any attribute modification	2013-11-09 00:16:44 -05:00
internal.h	get rid of s_files and files_lock	2013-11-09 00:16:20 -05:00
ioctl.c	file->f_op is never NULL...	2013-10-24 23:34:54 -04:00
ioprio.c
Kconfig	fs: remove generic_acl	2014-01-26 08:26:40 -05:00
Kconfig.binfmt
libfs.c	consolidate simple ->d_delete() instances	2013-11-15 22:04:17 -05:00
locks.c	locks: add new fcntl cmd values for handling file private locks	2014-03-31 08:24:43 -04:00
Makefile	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2014-01-28 08:38:04 -08:00
mbcache.c	fs: convert fs shrinkers to new scan/count API	2013-09-10 18:56:31 -04:00
mount.h	vfs: Is mounted should be testing mnt_ns for NULL or error.	2014-01-26 08:26:42 -05:00
mpage.c	block: Abstract out bvec iterator	2013-11-23 22:33:47 -08:00
namei.c	Fix mountpoint reference leakage in linkat	2014-01-31 17:33:13 -05:00
namespace.c	Driver core / sysfs patches for 3.14-rc1	2014-01-20 15:49:44 -08:00
no-block.c
open.c	locks: break delegations on any attribute modification	2013-11-09 00:16:44 -05:00
pipe.c	fs/pipe.c: skip file_update_time on frozen fs	2014-01-23 16:37:00 -08:00
pnode.c	split __lookup_mnt() in two functions	2013-10-24 23:35:00 -04:00
pnode.h	vfs: Don't copy mount bind mounts of /proc/<pid>/ns/mnt between namespaces	2013-08-26 18:42:15 -07:00
posix_acl.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2014-01-28 08:38:04 -08:00
proc_namespace.c	fs/proc_namespace.c: simplify testing nsp and nsp->mnt_ns	2014-01-23 16:37:02 -08:00
read_write.c	fs/compat: fix parameter handling for compat readv/writev syscalls	2014-01-29 16:22:39 -08:00
readdir.c	file->f_op is never NULL...	2013-10-24 23:34:54 -04:00
select.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2013-11-13 15:34:18 +09:00
seq_file.c	seq_file: always clear m->count when we free m->buf	2013-11-18 19:07:53 -08:00
signalfd.c
splice.c	fuse: fix pipe_buf_operations	2014-01-22 19:36:57 +01:00
stack.c
stat.c	vfs: split out vfs_getattr_nosec	2013-11-09 00:16:31 -05:00
statfs.c	vfs: allow O_PATH file descriptors for fstatfs()	2013-10-12 13:12:31 -07:00
super.c	fs/super.c: sync ro remount after blocking writers	2014-01-31 14:29:36 -05:00
sync.c	Merge branch 'akpm' (patches from Andrew Morton)	2013-11-13 15:45:43 +09:00
timerfd.c
utimes.c	locks: break delegations on any attribute modification	2013-11-09 00:16:44 -05:00
xattr.c