J. Bruce Fields b21996e36c locks: break delegations on unlink ... We need to break delegations on any operation that changes the set of links pointing to an inode. Start with unlink. Such operations also hold the i_mutex on a parent directory. Breaking a delegation may require waiting for a timeout (by default 90 seconds) in the case of a unresponsive NFS client. To avoid blocking all directory operations, we therefore drop locks before waiting for the delegation. The logic then looks like: acquire locks ... test for delegation; if found: take reference on inode release locks wait for delegation break drop reference on inode retry It is possible this could never terminate. (Even if we take precautions to prevent another delegation being acquired on the same inode, we could get a different inode on each retry.) But this seems very unlikely. The initial test for a delegation happens after the lock on the target inode is acquired, but the directory inode may have been acquired further up the call stack. We therefore add a "struct inode **" argument to any intervening functions, which we use to pass the inode back up to the caller in the case it needs a delegation synchronously broken. Cc: David Howells <dhowells@redhat.com> Cc: Tyler Hicks <tyhicks@canonical.com> Cc: Dustin Kirkland <dustin.kirkland@gazzang.com> Acked-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>		2013-11-09 00:16:42 -05:00
..
9p	9p: make v9fs_cache_inode_{get,put,set}_cookie empty inlines for !9P_CACHEFS	2013-10-24 23:34:47 -04:00
adfs	adfs: delayed freeing of sbi	2013-10-24 23:43:27 -04:00
affs	truncate: drop 'oldsize' truncate_pagecache() parameter	2013-09-12 15:38:02 -07:00
afs	afs: dget_parent() can't return a negative dentry	2013-09-29 22:02:24 -04:00
autofs4	autofs4: make freeing sbi rcu-delayed	2013-10-24 23:43:27 -04:00
befs	befs: split symlink iops in two - for short and long symlinks resp.	2013-10-24 23:34:50 -04:00
bfs	truncate: drop 'oldsize' truncate_pagecache() parameter	2013-09-12 15:38:02 -07:00
btrfs	btrfs: Fix crash due to not allocating integrity data for a bioset	2013-10-05 10:52:10 -04:00
cachefiles	locks: break delegations on unlink	2013-11-09 00:16:42 -05:00
ceph	ceph: use d_invalidate() to invalidate aliases	2013-09-06 12:55:29 -07:00
cifs	cifs: rcu-delay unload_nls() and freeing sbi	2013-10-24 23:43:27 -04:00
coda	coda_revalidate_inode(): switch to passing inode...	2013-11-09 00:16:21 -05:00
configfs	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2013-07-14 11:42:26 -07:00
cramfs	[readdir] convert f2fs	2013-06-29 12:56:46 +04:00
debugfs	debugfs: debugfs_remove_recursive() must not rely on list_empty(d_subdirs)	2013-07-31 12:16:31 -04:00
devpts
dlm	dlm: remove signal blocking	2013-08-12 15:22:43 -05:00
ecryptfs	locks: break delegations on unlink	2013-11-09 00:16:42 -05:00
efivarfs	efivarfs: we can use simple_lookup() now	2013-07-14 17:48:35 +04:00
efs	efs: iget_locked() doesn't return an ERR_PTR()	2013-08-24 12:10:22 -04:00
exofs	truncate: drop 'oldsize' truncate_pagecache() parameter	2013-09-12 15:38:02 -07:00
exportfs	exportfs: fix quadratic behavior in filehandle lookup	2013-11-09 00:16:38 -05:00
ext2	truncate: drop 'oldsize' truncate_pagecache() parameter	2013-09-12 15:38:02 -07:00
ext3	Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs	2013-09-06 09:06:02 -07:00
ext4	vfs: pull ext4's double-i_mutex-locking into common code	2013-11-09 00:16:39 -05:00
f2fs	f2fs: optimize gc for better performance	2013-09-05 13:50:32 +09:00
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-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client	2013-09-19 12:50:37 -05:00
fuse	fuse: rcu-delay freeing fuse_conn	2013-10-24 23:45:13 -04:00
gfs2	new helper: kfree_put_link()	2013-10-24 23:34:49 -04:00
hfs	truncate: drop 'oldsize' truncate_pagecache() parameter	2013-09-12 15:38:02 -07:00
hfsplus	truncate: drop 'oldsize' truncate_pagecache() parameter	2013-09-12 15:38:02 -07:00
hostfs	um: hostfs: Fix writeback	2013-09-07 10:38:29 +02:00
hpfs	hpfs: make freeing sbi and codetables rcu-delayed	2013-10-24 23:43:26 -04:00
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: use a single printk for jbd_debug()	2013-08-09 10:49:00 +02:00
jbd2	jbd2: Fix endian mixing problems in the checksumming code	2013-08-28 14:59:58 -04:00
jffs2	[readdir] convert jffs2	2013-06-29 12:56:47 +04:00
jfs	truncate: drop 'oldsize' truncate_pagecache() parameter	2013-09-12 15:38:02 -07:00
lockd	LOCKD: Don't call utsname()->nodename from nlmclnt_setlockargs	2013-08-05 15:03:46 -04:00
logfs	Lots of bug fixes, cleanups and optimizations. In the bug fixes	2013-07-02 09:39:34 -07:00
minix	truncate: drop 'oldsize' truncate_pagecache() parameter	2013-09-12 15:38:02 -07:00
ncpfs	ncpfs: rcu-delay unload_nls() and freeing ncp_server	2013-10-24 23:43:28 -04:00
nfs	nfs: use %p[dD] instead of open-coded (and often racy) equivalents	2013-10-24 23:34:50 -04:00
nfs_common
nfsd	locks: break delegations on unlink	2013-11-09 00:16:42 -05:00
nilfs2	nilfs2: fix issue with race condition of competition between segments for dirty blocks	2013-09-30 14:31:02 -07:00
nls
notify	fsnotify: update comments concerning locking scheme	2013-07-09 10:33:20 -07:00
ntfs	iget/iget5: don't bother with ->i_lock until we find a match	2013-11-09 00:16:31 -05:00
ocfs2	ocfs2: get rid of impossible checks	2013-11-09 00:16:32 -05:00
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	new helper: kfree_put_link()	2013-10-24 23:34:49 -04:00
pstore	pstore: Remove the messages related to compression failure	2013-09-16 09:28:29 -07:00
qnx4	qnx4: i_sb is never NULL	2013-11-09 00:16:32 -05:00
qnx6	[readdir] convert qnx6	2013-06-29 12:56:39 +04:00
quota	fs: convert fs shrinkers to new scan/count API	2013-09-10 18:56:31 -04:00
ramfs	initmpfs: move rootfs code from fs/ramfs/ to init/	2013-09-11 15:59:37 -07:00
reiserfs	reiserfs: fix race with flush_used_journal_lists and flush_journal_list	2013-09-24 11:24:21 +02:00
romfs	[readdir] convert romfs	2013-06-29 12:56:29 +04:00
squashfs	Squashfs: add corruption check for type in squashfs_readdir()	2013-09-06 04:57:54 +01:00
sysfs	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2013-09-07 14:36:57 -07:00
sysv	sysv: Add forgotten superblock lock init for v7 fs	2013-09-29 22:02:02 -04:00
ubifs	ubifs: switch to %pd	2013-10-24 23:34:51 -04:00
udf	udf: Fortify LVID loading	2013-09-24 11:23:33 +02:00
ufs	truncate: drop 'oldsize' truncate_pagecache() parameter	2013-09-12 15:38:02 -07:00
xfs	xfs: Use kmem_free() instead of free()	2013-10-04 13:56:12 -05:00
aio.c	rework aio migrate pages to use aio fs	2013-11-09 00:16:28 -05:00
anon_inodes.c	... and kill anon_inode_getfile_private()	2013-11-09 00:16:28 -05:00
attr.c
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	elf{,_fdpic} coredump: get rid of pointless if (siginfo->si_signo)	2013-11-09 00:16:30 -05:00
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	Merge branch 'for-3.12/core' of git://git.kernel.dk/linux-block	2013-09-22 15:00:11 -07:00
bio.c	block: Fix bio_copy_data()	2013-09-24 14:41:42 -07:00
block_dev.c	a trivial writeback fix	2013-09-13 23:06:40 -04:00
buffer.c	mm: vmscan: take page buffers dirty and locked state into account	2013-07-03 16:07:29 -07:00
char_dev.c	consolidate the reassignments of ->f_op in ->open() instances	2013-10-24 23:34:53 -04:00
compat_binfmt_elf.c
compat_ioctl.c	file->f_op is never NULL...	2013-10-24 23:34:54 -04:00
compat.c	[readdir] constify ->actor	2013-06-29 12:57:05 +04:00
coredump.c	constify do_coredump() argument	2013-11-09 00:16:29 -05:00
coredump.h
dcache.c	dcache: don't clear DCACHE_DISCONNECTED too early	2013-11-09 00:16:34 -05:00
dcookies.c
direct-io.c	direct-io: Use return from cmpxchg to decide of assignment happened	2013-09-09 10:47:42 -07:00
drop_caches.c	shrinker: add node awareness	2013-09-10 18:56:31 -04:00
eventfd.c
eventpoll.c	file->f_op is never NULL...	2013-10-24 23:34:54 -04:00
exec.c	file->f_op is never NULL...	2013-10-24 23:34:54 -04:00
fcntl.c	file->f_op is never NULL...	2013-10-24 23:34:54 -04:00
fhandle.c
file_table.c	get rid of s_files and files_lock	2013-11-09 00:16:20 -05:00
file.c
filesystems.c
fs_struct.c
fs-writeback.c	new helpers: lock_mount_hash/unlock_mount_hash	2013-10-24 23:34:59 -04:00
generic_acl.c
inode.c	vfs: rename I_MUTEX_QUOTA now that it's not used for quotas	2013-11-09 00:16:40 -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
Kconfig.binfmt
libfs.c	take anon inode allocation to libfs.c	2013-11-09 00:16:27 -05:00
locks.c	locks: implement delegations	2013-11-09 00:16:41 -05:00
Makefile
mbcache.c	fs: convert fs shrinkers to new scan/count API	2013-09-10 18:56:31 -04:00
mount.h	RCU'd vfsmounts	2013-11-09 00:16:19 -05:00
mpage.c
namei.c	locks: break delegations on unlink	2013-11-09 00:16:42 -05:00
namespace.c	RCU'd vfsmounts	2013-11-09 00:16:19 -05:00
no-block.c
open.c	get rid of s_files and files_lock	2013-11-09 00:16:20 -05:00
pipe.c	aio: don't include aio.h in sched.h	2013-05-07 20:16:25 -07:00
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
proc_namespace.c	don't bother with vfsmount_lock in mounts_poll()	2013-10-24 23:34:59 -04:00
read_write.c	file->f_op is never NULL...	2013-10-24 23:34:54 -04:00
readdir.c	file->f_op is never NULL...	2013-10-24 23:34:54 -04:00
select.c	file->f_op is never NULL...	2013-10-24 23:34:54 -04:00
seq_file.c	seq_file: add seq_list_*_percpu helpers	2013-07-08 13:36:41 +04:00
signalfd.c
splice.c	file->f_op is never NULL...	2013-10-24 23:34:54 -04:00
stack.c
stat.c	vfs: split out vfs_getattr_nosec	2013-11-09 00:16:31 -05:00
statfs.c
super.c	get rid of s_files and files_lock	2013-11-09 00:16:20 -05:00
sync.c	file->f_op is never NULL...	2013-10-24 23:34:54 -04:00
timerfd.c	timerfd: Add alarm timers	2013-05-29 12:57:34 -07:00
utimes.c
xattr_acl.c
xattr.c