Ian Kent 8f63aaa8b9 autofs4: fix lookup deadlock ... A deadlock can occur when user space uses a signal (autofs version 4 uses SIGCHLD for this) to effect expire completion. The order of events is: Expire process completes, but before being able to send SIGCHLD to it's parent ... Another process walks onto a different mount point and drops the directory inode semaphore prior to sending the request to the daemon as it must ... A third process does an lstat on on the expired mount point causing it to wait on expire completion (unfortunately) holding the directory semaphore. The mount request then arrives at the daemon which does an lstat and, deadlock. For some time I was concerned about releasing the directory semaphore around the expire wait in autofs4_lookup as well as for the mount call back. I finally realized that the last round of changes in this function made the expiring dentry and the lookup dentry separate and distinct so the check and possible wait can be done anywhere prior to the mount call back. This patch moves the check to just before the mount call back and inside the directory inode mutex release. Signed-off-by: Ian Kent <raven@themaw.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2009-04-01 08:59:23 -07:00
..
9p
adfs
affs
afs
autofs
autofs4	autofs4: fix lookup deadlock	2009-04-01 08:59:23 -07:00
befs
bfs
btrfs	fs: fix page_mkwrite error cases in core code and btrfs	2009-04-01 08:59:14 -07:00
cifs
coda
configfs
cramfs
debugfs
devpts
dlm
ecryptfs	ecryptfs: use kzfree()	2009-04-01 08:59:23 -07:00
efs
exportfs
ext2
ext3
ext4	mm: page_mkwrite change prototype to match fault	2009-04-01 08:59:14 -07:00
fat
freevxfs
fuse	mm: page_mkwrite change prototype to match fault	2009-04-01 08:59:14 -07:00
gfs2	mm: page_mkwrite change prototype to match fault	2009-04-01 08:59:14 -07:00
hfs
hfsplus
hostfs
hpfs
hppfs
hugetlbfs	mm: reintroduce and deprecate rlimit based access for SHM_HUGETLB	2009-04-01 08:59:12 -07:00
isofs
jbd
jbd2
jffs2
jfs
lockd
minix
ncpfs
nfs	mm: page_mkwrite change prototype to match fault	2009-04-01 08:59:14 -07:00
nfs_common
nfsd
nls
notify
ntfs	ntfs: remove private wrapper of endian helpers	2009-04-01 08:59:18 -07:00
ocfs2	mm: page_mkwrite change prototype to match fault	2009-04-01 08:59:14 -07:00
omfs
openpromfs
partitions
proc
qnx4
quota
ramfs	ramfs: add support for "mode=" mount option	2009-04-01 08:59:22 -07:00
reiserfs
romfs
smbfs
squashfs
sysfs	mm: page_mkwrite change prototype to match fault: fix sysfs	2009-04-01 08:59:14 -07:00
sysv
ubifs	mm: page_mkwrite change prototype to match fault	2009-04-01 08:59:14 -07:00
udf
ufs
xfs	mm: page_mkwrite change prototype to match fault	2009-04-01 08:59:14 -07:00
aio.c
anon_inodes.c
attr.c
bad_inode.c
binfmt_aout.c
binfmt_elf_fdpic.c
binfmt_elf.c
binfmt_em86.c
binfmt_flat.c
binfmt_misc.c
binfmt_script.c
binfmt_som.c
bio-integrity.c
bio.c
block_dev.c
buffer.c	filesystem freeze: allow SysRq emergency thaw to thaw frozen filesystems	2009-04-01 08:59:17 -07:00
char_dev.c
compat_binfmt_elf.c
compat_ioctl.c
compat.c
dcache.c
dcookies.c
direct-io.c
drop_caches.c
eventfd.c	epoll keyed wakeups: make eventfd use keyed wakeups	2009-04-01 08:59:20 -07:00
eventpoll.c	epoll keyed wakeups: teach epoll about hints coming with the wakeup key	2009-04-01 08:59:20 -07:00
exec.c
fcntl.c
fifo.c
file_table.c
file.c
filesystems.c
fs-writeback.c
generic_acl.c
inode.c
internal.h
ioctl.c
ioprio.c
Kconfig	quota: Move quota files into separate directory	2009-03-26 02:18:35 +01:00
Kconfig.binfmt
libfs.c
locks.c
Makefile
mbcache.c
mpage.c
namei.c
namespace.c
nfsctl.c
no-block.c
open.c
pipe.c
pnode.c
pnode.h
posix_acl.c
read_write.c
read_write.h
readdir.c
select.c
seq_file.c	cpumask: fix seq_bitmap_*() functions.	2009-03-30 22:05:11 +10:30
signalfd.c
splice.c
stack.c
stat.c
super.c
sync.c
timerfd.c
utimes.c
xattr_acl.c
xattr.c