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linux/fs
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Eric Wong 93b40265d0 epoll: prevent missed events on EPOLL_CTL_MOD 
commit 128dd1759d upstream.

EPOLL_CTL_MOD sets the interest mask before calling f_op->poll() to
ensure events are not missed.  Since the modifications to the interest
mask are not protected by the same lock as ep_poll_callback, we need to
ensure the change is visible to other CPUs calling ep_poll_callback.

We also need to ensure f_op->poll() has an up-to-date view of past
events which occured before we modified the interest mask.  So this
barrier also pairs with the barrier in wq_has_sleeper().

This should guarantee either ep_poll_callback or f_op->poll() (or both)
will notice the readiness of a recently-ready/modified item.

This issue was encountered by Andreas Voellmy and Junchang(Jason) Wang in:
http://thread.gmane.org/gmane.linux.kernel/1408782/

Signed-off-by: Eric Wong <normalperson@yhbt.net>
Cc: Hans Verkuil <hans.verkuil@cisco.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Davide Libenzi <davidel@xmailserver.org>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Mauro Carvalho Chehab <mchehab@infradead.org>
Cc: David Miller <davem@davemloft.net>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andreas Voellmy <andreas.voellmy@yale.edu>
Tested-by: "Junchang(Jason) Wang" <junchang.wang@yale.edu>
Cc: netdev@vger.kernel.org
Cc: linux-fsdevel@vger.kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-17 08:43:59 -08:00
..
9p
fs/9p: Use protocol-defined value for lock/getlock 'type' field.
2011-10-03 11:40:22 -07:00
adfs
Fix common misspellings
2011-03-31 11:26:23 -03:00
affs
affs: remove unnecessary dentry_unhash on rmdir, dir rename
2011-05-28 01:02:53 -04:00
afs
afs: Remote abort can cause BUG in rxrpc code
2012-03-23 11:20:51 -07:00
autofs4
autofs4 - fix reset pending flag on mount fail
2012-10-21 09:17:10 -07:00
befs
befs: Validate length of long symbolic links.
2011-08-29 13:29:06 -07:00
bfs
bfs: remove unnecessary dentry_unhash on dir rename
2011-05-28 01:02:50 -04:00
btrfs
Btrfs: call the ordered free operation without any locks held
2012-08-09 08:27:50 -07:00
cachefiles
Fix common misspellings
2011-03-31 11:26:23 -03:00
ceph
tmpfs,ceph,gfs2,isofs,reiserfs,xfs: fix fh_len checking
2012-10-21 09:17:10 -07:00
cifs
cifs: always update the inode cache with the results from a FIND_*
2012-08-01 12:26:53 -07:00
coda
coda_ioctl_permission() is safe in RCU mode
2011-06-20 10:44:19 -04:00
configfs
configfs: remove unnecessary dentry_unhash on rmdir, dir rename
2011-05-28 01:02:54 -04:00
cramfs
cramfs: get_cramfs_inode() returns ERR_PTR() on failure
2011-07-17 23:22:02 -04:00
debugfs
debugfs: move to new strtobool
2011-05-19 16:55:28 +09:30
devpts
fs/devpts/inode.c: correctly check d_alloc_name() return code in devpts_pty_new()
2011-03-22 17:44:17 -07:00
dlm
Merge branch 'trivial' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild-2.6
2011-05-26 13:19:00 -07:00
ecryptfs
eCryptfs: check for eCryptfs cipher support at mount
2012-11-26 11:34:55 -08:00
efs
block: remove per-queue plugging
2011-03-10 08:52:07 +01:00
exofs
fix exofs ->get_parent()
2011-07-17 23:20:29 -04:00
exportfs
vfs: Add open by file handle support
2011-03-15 02:21:44 -04:00
ext2
ext2: remove unnecessary dentry_unhash on rmdir/rename_dir
2011-05-26 07:26:56 -04:00
ext3
ext3: Fix fdatasync() for files with only i_size changes
2012-09-14 10:00:50 -07:00
ext4
ext4: lock i_mutex when truncating orphan inodes
2013-01-17 08:43:57 -08:00
fat
fat: Fix corrupt inode flags when remove ATTR_SYS flag
2011-05-31 19:42:24 +09:00
freevxfs
treewide: fix a few typos in comments
2011-05-10 10:16:21 +02:00
fscache
FS-Cache: Fix __fscache_uncache_all_inode_pages()'s outer loop
2011-07-21 10:59:16 -07:00
fuse
fuse: fix retrieve length
2012-09-14 10:00:50 -07:00
gfs2
tmpfs,ceph,gfs2,isofs,reiserfs,xfs: fix fh_len checking
2012-10-21 09:17:10 -07:00
hfs
hfs: fix hfs_find_init() sb->ext_tree NULL ptr oops
2011-12-21 12:57:41 -08:00
hfsplus
hfsplus: fix overflow in sector calculations in hfsplus_submit_bio
2012-06-22 11:34:14 -07:00
hostfs
hostfs: remove unnecessary dentry_unhash on rmdir, dir rename
2011-05-28 01:02:52 -04:00
hpfs
hpfs: remove unnecessary dentry_unhash on rmdir, dir rename
2011-05-28 01:02:54 -04:00
hppfs
hppfs: missing include
2011-11-11 09:35:59 -08:00
hugetlbfs
mm: compaction: introduce sync-light migration for use by compaction
2012-08-01 12:27:18 -07:00
isofs
tmpfs,ceph,gfs2,isofs,reiserfs,xfs: fix fh_len checking
2012-10-21 09:17:10 -07:00
jbd
jbd: Fix lock ordering bug in journal_unmap_buffer()
2012-12-03 12:59:14 -08:00
jbd2
jbd2: fix assertion failure in jbd2_journal_flush()
2013-01-17 08:43:57 -08:00
jffs2
jffs2: hold erase_completion_lock on exit
2013-01-17 08:43:55 -08:00
jfs
jfs: agstart field must be 64 bits
2011-06-20 17:53:24 -05:00
lockd
Revert: lockd: use rpc client's cl_nodename for id encoding
2012-10-28 10:02:11 -07:00
logfs
logfs doesn't need ->permission() at all
2011-06-20 10:44:26 -04:00
minix
minix: remove unnecessary dentry_unhash on rmdir, dir rename
2011-05-28 01:02:54 -04:00
ncpfs
ncpfs: fix rename over directory with dangling references
2011-05-28 01:02:53 -04:00
nfs
nfs: fix null checking in nfs_get_option_str()
2013-01-11 09:03:38 -08:00
nfs_common
Fix common misspellings
2011-03-31 11:26:23 -03:00
nfsd
nfsd4: fix oops on unusual readlike compound
2013-01-11 09:03:38 -08:00
nilfs2
nilfs2: fix deadlock issue between chcp and thaw ioctls
2012-08-15 12:04:10 -07:00
nls
…
notify
fanotify: fix missing break
2012-11-26 11:34:33 -08:00
ntfs
Fix common misspellings
2011-03-31 11:26:23 -03:00
ocfs2
ocfs2: ->e_leaf_clusters endianness breakage
2012-04-27 09:51:18 -07:00
omfs
Remove unneeded version.h includes from fs/
2011-06-24 08:34:22 -07:00
openpromfs
fs: icache RCU free inodes
2011-01-07 17:50:26 +11:00
partitions
block: Fix NULL pointer dereference in sd_revalidate_disk
2012-03-19 08:57:58 -07:00
proc
proc-ns: use d_set_d_op() API to set dentry ops in proc_ns_instantiate().
2012-04-02 09:27:18 -07:00
pstore
pstore: fix pstore filesystem mount/remount issue
2011-05-16 11:05:00 -07:00
qnx4
block: remove per-queue plugging
2011-03-10 08:52:07 +01:00
quota
VFS: Fix the remaining automounter semantics regressions
2011-11-11 09:36:22 -08:00
ramfs
fs: ramfs: file-nommu: add SetPageUptodate()
2012-07-16 08:47:52 -07:00
reiserfs
reiserfs: Protect reiserfs_quota_write() with write lock
2012-11-26 11:34:56 -08:00
romfs
romfs: fix romfs_get_unmapped_area() argument check
2011-06-27 18:00:12 -07:00
squashfs
Squashfs: fix mount time sanity check for corrupted superblock
2012-10-02 09:47:54 -07:00
sysfs
sysfs: sysfs_pathname/sysfs_add_one: Use strlcat() instead of strcat()
2012-10-31 09:51:35 -07:00
sysv
sysv: remove unnecessary dentry_unhash from rmdir, dir rename
2011-05-28 01:02:50 -04:00
ubifs
UBIFS: introduce categorized lprops counter
2012-11-26 11:34:34 -08:00
udf
udf: don't increment lenExtents while writing to a hole
2013-01-17 08:43:58 -08:00
ufs
ufs should use d_splice_alias()
2011-07-17 23:21:35 -04:00
xfs
xfs: fix reading of wrapped log data
2012-11-17 13:14:25 -08:00
aio.c
vfs: make AIO use the proper rw_verify_area() area helpers
2012-06-01 15:12:53 +08:00
anon_inodes.c
sanitize vfsmount refcounting changes
2011-01-16 13:47:07 -05:00
attr.c
Cache xattr security drop check for write v2
2011-05-28 12:02:09 -04:00
bad_inode.c
bad_inode_permission() is safe from RCU mode
2011-06-20 10:44:00 -04:00
binfmt_aout.c
Don't dump task struct in a.out core-dumps
2010-10-14 10:57:40 -07:00
binfmt_elf_fdpic.c
FDPIC: Fix memory leak
2011-07-06 12:15:16 -07:00
binfmt_elf.c
coredump: prevent double-free on an error path in core dumper
2012-10-07 08:27:25 -07:00
binfmt_em86.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
binfmt_flat.c
CRED: Fix load_flat_shared_library() to initialise bprm correctly
2011-05-03 10:10:51 +10:00
binfmt_misc.c
exec: do not leave bprm->interp on stack
2013-01-11 09:03:36 -08:00
binfmt_script.c
exec: do not leave bprm->interp on stack
2013-01-11 09:03:36 -08:00
binfmt_som.c
…
bio-integrity.c
block: Require subsystems to explicitly allocate bio_set integrity mempool
2011-03-17 11:11:05 +01:00
bio.c
block: improve the bio_add_page() and bio_add_pc_page() descriptions
2011-05-28 14:44:46 +02:00
block_dev.c
block: don't mark buffers beyond end of disk as mapped
2012-06-01 15:12:52 +08:00
buffer.c
block: replace __getblk_slow misfix by grow_dev_page fix
2012-09-14 10:00:39 -07:00
char_dev.c
Merge branch 'for-2.6.38/core' of git://git.kernel.dk/linux-2.6-block
2011-01-13 10:45:01 -08:00
compat_binfmt_elf.c
elf coredump: replace ELF_CORE_EXTRA_* macros by functions
2010-03-06 11:26:45 -08:00
compat_ioctl.c
fs/compat_ioctl.c: VIDEO_SET_SPU_PALETTE missing error check
2012-10-31 09:51:34 -07:00
compat.c
vfs: missed source of ->f_pos races
2012-09-14 10:00:37 -07:00
dcache.c
vfs: dcache: fix deadlock in tree traversal
2012-10-07 08:27:23 -07:00
dcookies.c
oprofile, dcookies: Fix possible circular locking dependency
2011-05-31 16:33:35 +02:00
direct-io.c
Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block
2011-03-24 10:16:26 -07:00
drop_caches.c
vmscan: change shrinker API by passing shrink_control struct
2011-05-25 08:39:26 -07:00
eventfd.c
Docbook: add fs/eventfd.c and fix typos in it
2011-02-21 15:07:04 -08:00
eventpoll.c
epoll: prevent missed events on EPOLL_CTL_MOD
2013-01-17 08:43:59 -08:00
exec.c
exec: do not leave bprm->interp on stack
2013-01-11 09:03:36 -08:00
fcntl.c
userns: rename is_owner_or_cap to inode_owner_or_capable
2011-03-23 19:47:13 -07:00
fhandle.c
fs/fhandle.c: add <linux/personality.h> for ia64
2011-04-14 16:06:56 -07:00
fifo.c
fifo: Do not restart open() if it already found a partner
2012-07-19 08:58:21 -07:00
file_table.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
2011-03-16 13:26:17 -07:00
file.c
vfs: avoid large kmalloc()s for the fdtable
2011-04-28 11:28:20 -07:00
filesystems.c
fs: synchronize_rcu when unregister_filesystem success not failure
2011-04-17 10:42:01 -07:00
fs_struct.c
sanitize vfsmount refcounting changes
2011-01-16 13:47:07 -05:00
fs-writeback.c
writeback: update dirtied_when for synced inode to prevent livelock
2011-10-03 11:40:44 -07:00
generic_acl.c
userns: rename is_owner_or_cap to inode_owner_or_capable
2011-03-23 19:47:13 -07:00
inode.c
mm: fix assertion mapping->nrpages == 0 in end_writeback()
2011-06-27 18:00:13 -07:00
internal.h
fs: move i_wb_list out from under inode_lock
2011-03-24 21:17:51 -04:00
ioctl.c
vfs: cleanup do_vfs_ioctl()
2011-03-21 00:16:08 -04:00
ioprio.c
ioprio: grab rcu_read_lock in sys_ioprio_{set,get}()
2010-11-15 10:23:31 +01:00
Kconfig
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
2011-05-26 09:52:14 -07:00
Kconfig.binfmt
coredump: default CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS=y
2010-10-27 18:03:12 -07:00
libfs.c
fs/libfs.c: fix simple_attr_write() on 32bit machines
2011-07-19 22:09:30 -07:00
locks.c
locks: fix checking of fcntl_setlease argument
2012-08-09 08:27:35 -07:00
Makefile
Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6
2011-03-16 19:01:29 -07:00
mbcache.c
vmscan: change shrinker API by passing shrink_control struct
2011-05-25 08:39:26 -07:00
mpage.c
mm/fs: add hooks to support cleancache
2011-05-26 10:01:43 -06:00
namei.c
vfs: fix double put after complete_walk()
2012-03-19 08:57:44 -07:00
namespace.c
vfs: umount_tree() might be called on subtree that had never made it
2012-06-10 00:33:01 +09:00
nfsctl.c
open-style analog of vfs_path_lookup()
2011-03-14 09:15:28 -04:00
no-block.c
llseek: automatically add .llseek fop
2010-10-15 15:53:27 +02:00
open.c
vfs: canonicalize create mode in build_open_flags()
2012-09-14 10:00:37 -07:00
pipe.c
pipes: add a "packetized pipe" mode for writing
2012-05-07 08:56:36 -07:00
pnode.c
fs: scale mntget/mntput
2011-01-07 17:50:33 +11:00
pnode.h
VFS: Clean up shared mount flag propagation
2010-03-03 14:07:55 -05:00
posix_acl.c
NFS: Prevent memory allocation failure in nfsacl_encode()
2011-01-25 15:24:47 -05:00
read_write.c
fix signedness mess in rw_verify_area() on 64bit architectures
2011-01-12 20:06:58 -05:00
read_write.h
…
readdir.c
vfs: fix warning: 'dirent' is used uninitialized in this function
2010-08-09 20:45:05 -07:00
select.c
select: remove unused MAX_SELECT_SECONDS
2011-03-21 00:16:08 -04:00
seq_file.c
fix apparmor dereferencing potentially freed dentry, sanitize __d_path() API
2011-12-21 12:57:36 -08:00
signalfd.c
epoll: ep_unregister_pollwait() can use the freed pwq->whead
2012-02-29 16:34:35 -08:00
splice.c
tcp: allow splice() to build full TSO packets
2012-04-27 09:51:18 -07:00
stack.c
…
stat.c
vfs: make O_PATH file descriptors usable for 'fstat()'
2012-10-02 09:47:23 -07:00
statfs.c
VFS: fix statfs() automounter semantics regression
2011-11-11 09:37:08 -08:00
super.c
wake up s_wait_unfrozen when ->freeze_fs fails
2012-05-21 09:40:05 -07:00
sync.c
Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block
2011-03-24 10:16:26 -07:00
timerfd.c
timerfd: Fix wakeup of processes when timer is cancelled on clock change
2011-06-14 11:46:14 +02:00
utimes.c
userns: rename is_owner_or_cap to inode_owner_or_capable
2011-03-23 19:47:13 -07:00
xattr_acl.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
xattr.c
Cache xattr security drop check for write v2
2011-05-28 12:02:09 -04:00