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Trond Myklebust c6c15e1ed3 nfsd: Fix slot wake up race in the nfsv4.1 callback code 
The currect code for nfsd41_cb_get_slot() and nfsd4_cb_done() has no
locking in order to guarantee atomicity, and so allows for races of
the form.

Task 1                                  Task 2
======                                  ======
if (test_and_set_bit(0) != 0) {
                                        clear_bit(0)
                                        rpc_wake_up_next(queue)
        rpc_sleep_on(queue)
        return false;
}

This patch breaks the race condition by adding a retest of the bit
after the call to rpc_sleep_on().

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Cc: stable@vger.kernel.org
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2014-11-19 15:45:44 -05:00
..
9p
9p: switch to %p[dD]
2014-10-09 02:39:04 -04:00
adfs
adfs: add __printf verification, fix format/argument mismatches
2014-08-08 15:57:24 -07:00
affs
fs/affs: remove redundant sys_tz declarations
2014-10-14 02:18:22 +02:00
afs
Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2014-10-13 16:23:15 +02:00
autofs4
autofs4: d_manage() should return -EISDIR when appropriate in rcu-walk mode.
2014-10-14 02:18:16 +02:00
befs
fs/befs/btree.c: remove typedef befs_btree_node
2014-10-14 02:18:20 +02:00
bfs
fs/bfs: use bfs prefix for dump_imap
2014-08-08 15:57:24 -07:00
btrfs
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs
2014-11-09 14:30:24 -08:00
cachefiles
FS-Cache fixes
2014-10-14 08:40:15 +02:00
ceph
ceph: fix flush tid comparision
2014-11-13 22:19:05 +03:00
cifs
[CIFS] Remove obsolete comment
2014-10-17 17:17:12 -05:00
coda
fs/coda: use linux/uaccess.h
2014-08-08 15:57:20 -07:00
configfs
…
cramfs
fs/cramfs/inode.c: use linux/uaccess.h
2014-08-08 15:57:25 -07:00
debugfs
fs: debugfs: remove trailing whitespace
2014-07-09 16:58:21 -07:00
devpts
fs/devpts/inode.c: convert printk to pr_foo()
2014-06-06 16:08:14 -07:00
dlm
dlm: fix missing endian conversion of rcom_status flags
2014-10-14 15:11:48 -05:00
ecryptfs
fs: limit filesystem stacking depth
2014-10-24 00:14:39 +02:00
efivarfs
…
efs
fs/efs/namei.c: return is not a function
2014-08-08 15:57:18 -07:00
exofs
Boaz Harrosh - Fix broken email address
2014-10-19 20:22:32 +03:00
exportfs
…
ext2
percpu_counter: add @gfp to percpu_counter_init()
2014-09-08 09:51:29 +09:00
ext3
ext3: Don't check quota format when there are no quota files
2014-10-22 09:02:48 +02:00
ext4
ext4: make ext4_ext_convert_to_initialized() return proper number of blocks
2014-10-30 10:53:17 -04:00
f2fs
f2fs: support volatile operations for transient data
2014-10-07 11:54:41 -07:00
fat
fat: remove redundant sys_tz declaration
2014-10-14 02:18:20 +02:00
freevxfs
…
fscache
fs/fscache/object-list.c: use __seq_open_private()
2014-10-13 17:52:21 +01:00
fuse
vfs: Make d_invalidate return void
2014-10-09 02:38:57 -04:00
gfs2
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2014-10-13 11:28:42 +02:00
hfs
fs/hfs/hfs_fs.h: remove redundant sys_tz declaration
2014-10-14 02:18:20 +02:00
hfsplus
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2014-06-12 10:30:18 -07:00
hostfs
hostfs: support rename flags
2014-08-07 14:40:09 -04:00
hpfs
fs/hpfs/dnode.c: fix suspect code indent
2014-08-08 15:57:22 -07:00
hppfs
…
hugetlbfs
…
isofs
isofs: don't bother with ->d_op for normal case
2014-10-31 06:33:17 -04:00
jbd
fs, jbd: use a more generic hash function
2014-10-22 10:02:04 +02:00
jbd2
jbd2: use a better hash function for the revoke table
2014-10-30 10:53:17 -04:00
jffs2
[jffs2] kill wbuf_queued/wbuf_dwork_lock
2014-10-09 02:39:01 -04:00
jfs
Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2014-10-13 16:23:15 +02:00
kernfs
vfs: Remove unnecessary calls of check_submounts_and_drop
2014-10-09 02:38:56 -04:00
lockd
File locking related changes for v3.18 (pile #1)
2014-10-11 13:21:34 -04:00
logfs
fs/logfs/readwrite.c: kernel-doc warning fixes
2014-08-06 18:01:12 -07:00
minix
minix zmap block counts calculation fix
2014-08-08 15:57:20 -07:00
ncpfs
fs/ncpfs/dir.c: remove redundant sys_tz declaration
2014-10-14 02:18:16 +02:00
nfs
NFS: Don't try to reclaim delegation open state if recovery failed
2014-11-12 17:19:04 -05:00
nfs_common
lockd: move lockd's grace period handling into its own module
2014-09-17 16:33:11 -04:00
nfsd
nfsd: Fix slot wake up race in the nfsv4.1 callback code
2014-11-19 15:45:44 -05:00
nilfs2
nilfs2: improve the performance of fdatasync()
2014-10-14 02:18:20 +02:00
nls
…
notify
fanotify: fix notification of groups with inode & mount marks
2014-11-13 16:17:06 -08:00
ntfs
NTFS: Bump version to 2.1.31.
2014-10-16 12:53:35 +01:00
ocfs2
fix breakage in o2net_send_tcp_msg()
2014-11-05 15:21:18 -05:00
omfs
FS/OMFS: block number sanity check during fill_super operation
2014-10-14 02:18:22 +02:00
openpromfs
…
overlayfs
ovl: don't poison cursor
2014-11-05 08:49:38 -05:00
proc
mm: softdirty: enable write notifications on VMAs after VM_SOFTDIRTY cleared
2014-10-14 02:18:28 +02:00
pstore
pstore: Fix duplicate {console,ftrace}-efi entries
2014-10-15 13:51:33 -07:00
qnx4
…
qnx6
fs/qnx6: update debugging to current functions
2014-08-08 15:57:26 -07:00
quota
quota: Properly return errors from dquot_writeback_dquots()
2014-10-22 09:08:03 +02:00
ramfs
fs/ramfs/file-nommu.c: replace count*size kzalloc by kcalloc
2014-08-08 15:57:18 -07:00
reiserfs
fs/reiserfs/journal.c: fix sparse context imbalance warning
2014-10-14 02:18:20 +02:00
romfs
fs/romfs/super.c: add blank line after declarations
2014-08-08 15:57:25 -07:00
squashfs
fs/squashfs/super.c: logging cleanup
2014-08-06 18:01:13 -07:00
sysfs
…
sysv
…
ubifs
UBIFS: Fix trivial typo in power_cut_emulated()
2014-09-30 09:29:44 +03:00
udf
udf: Fix loading of special inodes
2014-10-09 13:06:14 +02:00
ufs
fs/ufs/balloc.c: remove unused variable
2014-10-14 02:18:20 +02:00
xfs
xfs: track bulkstat progress by agino
2014-11-07 08:33:52 +11:00
aio.c
percpu_ref: add PERCPU_REF_INIT_* flags
2014-09-24 13:31:50 -04:00
anon_inodes.c
…
attr.c
fs,userns: Change inode_capable to capable_wrt_inode_uidgid
2014-06-10 13:57:22 -07:00
bad_inode.c
bad_inode: add ->rename2()
2014-08-07 14:40:09 -04:00
binfmt_aout.c
handle suicide on late failure exits in execve() in search_binary_handler()
2014-10-09 02:39:00 -04:00
binfmt_elf_fdpic.c
handle suicide on late failure exits in execve() in search_binary_handler()
2014-10-09 02:39:00 -04:00
binfmt_elf.c
handle suicide on late failure exits in execve() in search_binary_handler()
2014-10-09 02:39:00 -04:00
binfmt_em86.c
…
binfmt_flat.c
…
binfmt_misc.c
binfmt_misc: work around gcc-4.9 warning
2014-10-14 02:18:16 +02:00
binfmt_script.c
…
binfmt_som.c
…
block_dev.c
Return short read or 0 at end of a raw device, not EIO
2014-10-31 06:33:26 -04:00
buffer.c
fs: clarify rate limit suppressed buffer I/O errors
2014-10-21 13:55:11 -06:00
char_dev.c
…
compat_binfmt_elf.c
…
compat_ioctl.c
Bluetooth: Move HCI socket definitions into its own header file
2014-07-11 13:53:04 +03:00
compat.c
vfs: move getname() from callers to do_mount()
2014-10-09 02:39:16 -04:00
coredump.c
coredump: add %i/%I in core_pattern to report the tid of the crashed thread
2014-10-14 02:18:21 +02:00
dcache.c
fix inode leaks on d_splice_alias() failure exits
2014-10-23 22:30:18 -04:00
dcookies.c
…
direct-io.c
fuse: honour max_read and max_write in direct_io mode
2014-09-26 21:16:51 -04:00
drop_caches.c
fs: convert use of typedef ctl_table to struct ctl_table
2014-06-06 16:08:16 -07:00
eventfd.c
…
eventpoll.c
eventpoll: fix uninitialized variable in epoll_ctl
2014-09-10 15:42:12 -07:00
exec.c
handle suicide on late failure exits in execve() in search_binary_handler()
2014-10-09 02:39:00 -04:00
fcntl.c
security: make security_file_set_fowner, f_setown and __f_setown void return
2014-09-09 16:01:36 -04:00
fhandle.c
…
file_table.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2014-10-13 11:28:42 +02:00
file.c
Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2014-10-13 15:44:12 +02:00
filesystems.c
…
fs_pin.c
make fs/{namespace,super}.c forget about acct.h
2014-08-07 14:40:09 -04:00
fs_struct.c
…
fs-writeback.c
sched: Remove proliferation of wait_on_bit() action functions
2014-07-16 15:10:39 +02:00
inode.c
mm: allow drivers to prevent new writable mappings
2014-08-08 15:57:31 -07:00
internal.h
vfs: export __inode_permission() to modules
2014-10-24 00:14:35 +02:00
ioctl.c
…
Kconfig
overlay filesystem
2014-10-24 00:14:38 +02:00
Kconfig.binfmt
…
libfs.c
locks: plumb a "priv" pointer into the setlease routines
2014-10-07 14:06:12 -04:00
locks.c
locks: flock_make_lock should return a struct file_lock (or PTR_ERR)
2014-10-07 14:06:13 -04:00
Makefile
overlay filesystem
2014-10-24 00:14:38 +02:00
mbcache.c
fs/mbcache: replace __builtin_log2() with ilog2()
2014-06-25 22:08:29 -04:00
mount.h
vfs: Add a function to lazily unmount all mounts from any dentry.
2014-10-09 02:38:55 -04:00
mpage.c
vfs: guard end of device for mpage interface
2014-10-09 22:25:53 -04:00
namei.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2014-11-02 10:28:43 -08:00
namespace.c
vfs: introduce clone_private_mount()
2014-10-24 00:14:36 +02:00
no-block.c
…
open.c
vfs: add i_op->dentry_open()
2014-10-24 00:14:35 +02:00
pipe.c
…
pnode.c
get rid of propagate_umount() mistakenly treating slaves as busy.
2014-08-30 18:31:41 -04:00
pnode.h
…
posix_acl.c
…
proc_namespace.c
namespaces: Use task_lock and not rcu to protect nsproxy
2014-07-29 18:08:50 -07:00
read_write.c
cachefiles_write_page(): switch to __kernel_write()
2014-10-09 02:39:05 -04:00
readdir.c
…
select.c
…
seq_file.c
fs/seq_file: fallback to vmalloc allocation
2014-07-03 09:21:54 -07:00
signalfd.c
…
splice.c
vfs: export do_splice_direct() to modules
2014-10-24 00:14:35 +02:00
stack.c
fs: fix comment for 'CONFIG_LBADF'
2014-08-26 09:35:56 +02:00
stat.c
…
statfs.c
…
super.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2014-10-13 11:28:42 +02:00
sync.c
Export sync_filesystem() for modular ->remount_fs() use
2014-09-05 08:16:21 -07:00
timerfd.c
timerfd: Remove an always true check
2014-08-27 11:17:48 +02:00
utimes.c
…
xattr.c
vfs: Deduplicate code shared by xattr system calls operating on paths
2014-10-12 17:09:10 -04:00