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linux/fs
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Nelson Elhage d8805e633e epoll: fix spurious lockdep warnings 
epoll can acquire recursively acquire ep->mtx on multiple "struct
eventpoll"s at once in the case where one epoll fd is monitoring another
epoll fd.  This is perfectly OK, since we're careful about the lock
ordering, but it causes spurious lockdep warnings.  Annotate the recursion
using mutex_lock_nested, and add a comment explaining the nesting rules
for good measure.

Recent versions of systemd are triggering this, and it can also be
demonstrated with the following trivial test program:

--------------------8<--------------------

int main(void) {
   int e1, e2;
   struct epoll_event evt = {
       .events = EPOLLIN
   };

   e1 = epoll_create1(0);
   e2 = epoll_create1(0);
   epoll_ctl(e1, EPOLL_CTL_ADD, e2, &evt);
   return 0;
}
--------------------8<--------------------

Reported-by: Paul Bolle <pebolle@tiscali.nl>
Tested-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Nelson Elhage <nelhage@nelhage.com>
Acked-by: Jason Baron <jbaron@redhat.com>
Cc: Dave Jones <davej@redhat.com>
Cc: Davide Libenzi <davidel@xmailserver.org>
Cc: <stable@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-10-31 17:30:57 -07:00
..
9p net/9p: Convert net/9p protocol dumps to tracepoints 2011-10-24 11:13:12 -05:00
adfs
affs
afs
autofs4 autofs4: fix debug printk warning uncovered by cleanup 2011-08-08 12:02:43 -07:00
befs befs: Validate length of long symbolic links. 2011-08-17 13:31:24 -07:00
bfs
btrfs Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/hch/vfs-queue 2011-10-28 10:49:34 -07:00
cachefiles
ceph libceph: fix double-free of page vector 2011-10-25 16:10:17 -07:00
cifs Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/hch/vfs-queue 2011-10-28 10:49:34 -07:00
coda fs: Convert vmalloc/memset to vzalloc 2011-09-15 13:56:28 +02:00
configfs doc: fix broken references 2011-09-27 18:08:04 +02:00
cramfs
debugfs debugfs: Fix a comment mistake 2011-08-22 17:41:48 -07:00
devpts
dlm
ecryptfs treewide: use __printf not __attribute__((format(printf,...))) 2011-10-31 17:30:54 -07:00
efs
exofs ore: Enable RAID5 mounts 2011-10-24 17:22:29 -07:00
exportfs
ext2 treewide: use __printf not __attribute__((format(printf,...))) 2011-10-31 17:30:54 -07:00
ext3 Merge branch 'next' of git://selinuxproject.org/~jmorris/linux-security 2011-10-25 09:45:31 +02:00
ext4 treewide: use __printf not __attribute__((format(printf,...))) 2011-10-31 17:30:54 -07:00
fat fat: follow rename pack_hex_byte() to hex_byte_pack() 2011-10-31 17:30:57 -07:00
freevxfs
fscache
fuse fuse: fix memory leak 2011-09-12 11:47:10 -07:00
gfs2 treewide: use __printf not __attribute__((format(printf,...))) 2011-10-31 17:30:54 -07:00
hfs
hfsplus hfsplus: fix filesystem size checks 2011-09-15 09:03:17 -07:00
hostfs
hpfs treewide: use __printf not __attribute__((format(printf,...))) 2011-10-31 17:30:54 -07:00
hppfs
hugetlbfs lockdep: Add helper function for dir vs file i_mutex annotation 2011-08-25 10:50:18 -07:00
isofs
jbd
jbd2
jffs2 Merge branch 'next-evm' of git://git.kernel.org/pub/scm/linux/kernel/git/zohar/ima-2.6 into next 2011-08-09 10:31:03 +10:00
jfs Merge branch 'next' of git://selinuxproject.org/~jmorris/linux-security 2011-10-25 09:45:31 +02:00
lockd SUNRPC: Replace svc_addr_u by sockaddr_storage 2011-09-14 08:21:48 -04:00
logfs lib/string.c: introduce memchr_inv() 2011-10-31 17:30:47 -07:00
minix
ncpfs
nfs Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/hch/vfs-queue 2011-10-28 10:49:34 -07:00
nfs_common
nfsd nfs41: implement DESTROY_CLIENTID operation 2011-10-24 04:24:30 -04:00
nilfs2 treewide: use __printf not __attribute__((format(printf,...))) 2011-10-31 17:30:54 -07:00
nls
notify
ntfs treewide: use __printf not __attribute__((format(printf,...))) 2011-10-31 17:30:54 -07:00
ocfs2 treewide: use __printf not __attribute__((format(printf,...))) 2011-10-31 17:30:54 -07:00
omfs
openpromfs
partitions treewide: use __printf not __attribute__((format(printf,...))) 2011-10-31 17:30:54 -07:00
proc mm: distinguish between mlocked and pinned pages 2011-10-31 17:30:46 -07:00
pstore
qnx4
quota VFS: Fix the remaining automounter semantics regressions 2011-09-26 19:16:46 -07:00
ramfs
reiserfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2011-10-25 12:11:02 +02:00
romfs
squashfs doc: fix broken references 2011-09-27 18:08:04 +02:00
sysfs sysfs: Remove support for tagged directories with untagged members (again) 2011-10-25 15:10:28 +02:00
sysv
ubifs UBIFS: not build debug messages with CONFIG_UBIFS_FS_DEBUG disabled 2011-08-19 18:58:58 +03:00
udf treewide: use __printf not __attribute__((format(printf,...))) 2011-10-31 17:30:54 -07:00
ufs treewide: use __printf not __attribute__((format(printf,...))) 2011-10-31 17:30:54 -07:00
xfs treewide: use __printf not __attribute__((format(printf,...))) 2011-10-31 17:30:54 -07:00
aio.c Cross Memory Attach 2011-10-31 17:30:44 -07:00
anon_inodes.c
attr.c Merge branch 'next-evm' of git://git.kernel.org/pub/scm/linux/kernel/git/zohar/ima-2.6 into next 2011-08-09 10:31:03 +10:00
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 Avoid dereferencing a 'request_queue' after last close. 2011-09-10 17:20:21 +10:00
buffer.c fs/buffer.c: add device information for error output in __find_get_block_slow() 2011-10-31 17:30:49 -07:00
char_dev.c
compat_binfmt_elf.c
compat_ioctl.c compat_ioctl: add compat handler for PPPIOCGL2TPSTATS 2011-08-07 22:24:41 -07:00
compat.c Cross Memory Attach 2011-10-31 17:30:44 -07:00
dcache.c vfs: renumber DCACHE_xyz flags, remove some stale ones 2011-08-06 22:52:40 -07:00
dcookies.c
direct-io.c direct-io: merge direct_io_walker into __blockdev_direct_IO 2011-10-28 14:58:58 +02:00
drop_caches.c
eventfd.c
eventpoll.c epoll: fix spurious lockdep warnings 2011-10-31 17:30:57 -07:00
exec.c oom: remove oom_disable_count 2011-10-31 17:30:45 -07:00
fcntl.c
fhandle.c
fifo.c
file_table.c
file.c
filesystems.c
fs_struct.c
fs-writeback.c
generic_acl.c
inode.c vfs: fix spinning prevention in prune_icache_sb 2011-10-28 14:58:55 +02:00
internal.h
ioctl.c
ioprio.c
Kconfig tmpfs: add "tmpfs" to the Kconfig prompt to make it obvious. 2011-10-31 17:30:45 -07:00
Kconfig.binfmt
libfs.c
locks.c Merge branch 'for-3.2' of git://linux-nfs.org/~bfields/linux 2011-10-25 15:42:01 +02:00
Makefile fs/Makefile: Stupid typo breakage of exofs inclusion 2011-10-27 08:36:51 +02:00
mbcache.c
mpage.c
namei.c leases: fix write-open/read-lease race 2011-10-28 14:59:00 +02:00
namespace.c vfs: add "device" tag to /proc/self/mountstats 2011-10-28 13:55:08 +02:00
no-block.c
open.c leases: fix write-open/read-lease race 2011-10-28 14:59:00 +02:00
pipe.c fs/pipe.c: add ->statfs callback for pipefs 2011-10-31 17:30:51 -07:00
pnode.c
pnode.h
posix_acl.c vfs: pass all mask flags check_acl and posix_acl_permission 2011-10-28 14:58:54 +02:00
read_write.c Cross Memory Attach 2011-10-31 17:30:44 -07:00
read_write.h
readdir.c
select.c
seq_file.c
signalfd.c
splice.c
stack.c mm: a few small updates for radix-swap 2011-08-03 14:25:24 -10:00
stat.c vfs: remove LOOKUP_NO_AUTOMOUNT flag 2011-09-27 08:12:33 -07:00
statfs.c
super.c vmscan: fix shrinker callback bug in fs/super.c 2011-10-31 17:30:49 -07:00
sync.c
timerfd.c
utimes.c
xattr_acl.c
xattr.c