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Ryusuke Konishi d611b22f1a nilfs2: fix oops due to a bad aops initialization 
Nilfs in 2.6.39-rc1 hit the following oops:

 BUG: unable to handle kernel NULL pointer dereference at 0000000000000048
 IP: [<ffffffff810ac235>] try_to_release_page+0x2a/0x3d
 PGD 234cb6067 PUD 234c72067 PMD 0
 Oops: 0000 [#1] SMP
 <snip>
 Process truncate (pid: 10995, threadinfo ffff8802353c2000, task ffff880234cfa000)
 Stack:
  ffff8802333c77b8 ffffffff810b64b0 0000000000003802 ffffffffa0052cca
  0000000000000000 ffff8802353c3b58 0000000000000000 ffff8802353c3b58
  0000000000000001 0000000000000000 ffffea0007b92308 ffffea0007b92308
 Call Trace:
  [<ffffffff810b64b0>] ? invalidate_inode_pages2_range+0x15f/0x273
  [<ffffffffa0052cca>] ? nilfs_palloc_get_block+0x2d/0xaf [nilfs2]
  [<ffffffff810589e7>] ? bit_waitqueue+0x14/0xa1
  [<ffffffff81058ab1>] ? wake_up_bit+0x10/0x20
  [<ffffffffa00433fd>] ? nilfs_forget_buffer+0x66/0x7a [nilfs2]
  [<ffffffffa00467b8>] ? nilfs_btree_concat_left+0x5c/0x77 [nilfs2]
  [<ffffffffa00471fc>] ? nilfs_btree_delete+0x395/0x3cf [nilfs2]
  [<ffffffffa00449a3>] ? nilfs_bmap_do_delete+0x6e/0x79 [nilfs2]
  [<ffffffffa0045845>] ? nilfs_btree_last_key+0x14b/0x15e [nilfs2]
  [<ffffffffa00449dd>] ? nilfs_bmap_truncate+0x2f/0x83 [nilfs2]
  [<ffffffffa0044ab2>] ? nilfs_bmap_last_key+0x35/0x62 [nilfs2]
  [<ffffffffa003e99b>] ? nilfs_truncate_bmap+0x6b/0xc7 [nilfs2]
  [<ffffffffa003ee4a>] ? nilfs_truncate+0x79/0xe4 [nilfs2]
  [<ffffffff810b6c00>] ? vmtruncate+0x33/0x3b
  [<ffffffffa003e8f1>] ? nilfs_setattr+0x4d/0x8c [nilfs2]
  [<ffffffff81026106>] ? do_page_fault+0x31b/0x356
  [<ffffffff810f9d61>] ? notify_change+0x17d/0x262
  [<ffffffff810e5046>] ? do_truncate+0x65/0x80
  [<ffffffff810e52af>] ? sys_ftruncate+0xf1/0xf6
  [<ffffffff8132c012>] ? system_call_fastpath+0x16/0x1b
 Code: c3 48 83 ec 08 48 8b 17 48 8b 47 18 80 e2 01 75 04 0f 0b eb fe 48 8b 17 80 e6 20 74 05 31 c0 41 59 c3 48 85 c0 74 11 48 8b 40 58
  8b 40 48 48 85 c0 74 04 41 58 ff e0 59 e9 b1 b5 05 00 41 54
 RIP  [<ffffffff810ac235>] try_to_release_page+0x2a/0x3d
  RSP <ffff8802353c3b08>
 CR2: 0000000000000048

This oops was brought in by the change "block: remove per-queue
plugging" (commit: 7eaceaccab5f40bb).  It initializes mapping->a_ops
with a NULL pointer for some pages in nilfs (e.g. btree node pages),
but mm code doesn't NULL pointer checks against mapping->a_ops. (the
check is done for each callback function)

This corrects the aops initialization and fixes the oops.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Acked-by: Jens Axboe <jaxboe@fusionio.com>
2011-03-30 17:39:25 +09:00
..
9p
userns: rename is_owner_or_cap to inode_owner_or_capable
2011-03-23 19:47:13 -07:00
adfs
Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block
2011-03-24 10:16:26 -07:00
affs
Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block
2011-03-24 10:16:26 -07:00
afs
afs: Fix oops in afs_unlink_writeback
2011-02-25 11:12:37 -08:00
autofs4
autofs4: Do not potentially dereference NULL pointer returned by fget() in autofs_dev_ioctl_setpipefd()
2011-03-24 14:54:35 -04:00
befs
block: remove per-queue plugging
2011-03-10 08:52:07 +01:00
bfs
Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block
2011-03-24 10:16:26 -07:00
btrfs
Merge branch 'for-linus-unmerged' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable
2011-03-28 15:31:05 -07:00
cachefiles
CacheFiles: Add calls to path-based security hooks
2011-01-24 10:49:45 +11:00
ceph
fs: don't use igrab() while holding i_lock
2011-03-29 07:50:34 -07:00
cifs
block: remove per-queue plugging
2011-03-10 08:52:07 +01:00
coda
codafs: fix build break when CONFIG_PROC_SYSCTL=n
2011-03-25 17:45:16 -07:00
configfs
configfs: change depends -> select SYSFS
2011-01-16 21:22:29 +00:00
cramfs
cramfs: generate unique inode number for better inode cache usage
2011-01-13 08:03:23 -08:00
debugfs
debugfs: Fix filesystem reference counting on debugfs_remove() failure
2011-02-18 08:07:18 -08:00
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
dlm: use alloc_workqueue function
2011-03-10 13:22:34 -06:00
ecryptfs
eCryptfs: write lock requested keys
2011-03-28 01:49:43 -05:00
efs
block: remove per-queue plugging
2011-03-10 08:52:07 +01:00
exofs
Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block
2011-03-24 10:16:26 -07:00
exportfs
vfs: Add open by file handle support
2011-03-15 02:21:44 -04:00
ext2
Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block
2011-03-24 10:16:26 -07:00
ext3
Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block
2011-03-24 10:16:26 -07:00
ext4
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
2011-03-25 09:57:41 -07:00
fat
Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block
2011-03-24 10:16:26 -07:00
freevxfs
block: remove per-queue plugging
2011-03-10 08:52:07 +01:00
fscache
FS-Cache: Fix operation handling
2011-01-14 09:23:36 -08:00
fuse
Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block
2011-03-24 10:16:26 -07:00
gfs2
Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block
2011-03-24 10:16:26 -07:00
hfs
Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block
2011-03-24 10:16:26 -07:00
hfsplus
Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block
2011-03-24 10:16:26 -07:00
hostfs
switch hostfs
2011-01-12 20:03:42 -05:00
hpfs
Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block
2011-03-24 10:16:26 -07:00
hppfs
fs: icache RCU free inodes
2011-01-07 17:50:26 +11:00
hugetlbfs
mm: hugetlbfs: change remove_from_page_cache
2011-03-22 17:44:02 -07:00
isofs
Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block
2011-03-24 10:16:26 -07:00
jbd
Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block
2011-03-24 10:16:26 -07:00
jbd2
Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block
2011-03-24 10:16:26 -07:00
jffs2
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6 into for-linus-1
2011-03-25 17:41:20 +02:00
jfs
Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block
2011-03-24 10:16:26 -07:00
lockd
NLM: Fix "kernel BUG at fs/lockd/host.c:417!" or ".../host.c:283!"
2011-01-25 15:24:47 -05:00
logfs
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
2011-03-24 19:01:30 -07:00
minix
Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block
2011-03-24 10:16:26 -07:00
ncpfs
fs: change to new flag variable
2011-03-17 14:02:57 +01:00
nfs
fs: don't use igrab() while holding i_lock
2011-03-29 07:50:34 -07:00
nfs_common
Remove pointless memset in nfsacl_encode()
2011-03-22 20:03:52 -04:00
nfsd
Merge branch 'for-2.6.39' of git://linux-nfs.org/~bfields/linux
2011-03-24 08:20:39 -07:00
nilfs2
nilfs2: fix oops due to a bad aops initialization
2011-03-30 17:39:25 +09:00
nls
…
notify
fs: rename inode_lock to inode_hash_lock
2011-03-24 21:17:51 -04:00
ntfs
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
2011-03-24 19:01:30 -07:00
ocfs2
Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jlbec/ocfs2
2011-03-28 13:03:31 -07:00
omfs
Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block
2011-03-24 10:16:26 -07:00
openpromfs
fs: icache RCU free inodes
2011-01-07 17:50:26 +11:00
partitions
Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block
2011-03-24 10:16:26 -07:00
proc
proc: fix oops on invalid /proc/<pid>/maps access
2011-03-27 19:09:29 -07:00
pstore
pstore: cleanups to pstore_dump()
2011-03-22 16:01:49 -07:00
qnx4
block: remove per-queue plugging
2011-03-10 08:52:07 +01:00
quota
fs: move i_sb_list out from under inode_lock
2011-03-24 21:16:32 -04:00
ramfs
…
reiserfs
Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block
2011-03-24 10:16:26 -07:00
romfs
fs: icache RCU free inodes
2011-01-07 17:50:26 +11:00
squashfs
Squashfs: Use vmalloc rather than kmalloc for zlib workspace
2011-03-22 23:01:26 +00:00
sysfs
kconfig: rename CONFIG_EMBEDDED to CONFIG_EXPERT
2011-01-20 17:02:05 -08:00
sysv
Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block
2011-03-24 10:16:26 -07:00
ubifs
Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block
2011-03-24 10:16:26 -07:00
udf
Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block
2011-03-24 10:16:26 -07:00
ufs
Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block
2011-03-24 10:16:26 -07:00
xfs
Merge branch 'for-linus' of git://oss.sgi.com/xfs/xfs
2011-03-28 15:51:02 -07:00
aio.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
anon_inodes.c
sanitize vfsmount refcounting changes
2011-01-16 13:47:07 -05:00
attr.c
userns: rename is_owner_or_cap to inode_owner_or_capable
2011-03-23 19:47:13 -07:00
bad_inode.c
fs: provide rcu-walk aware permission i_ops
2011-01-07 17:50:29 +11:00
binfmt_aout.c
…
binfmt_elf_fdpic.c
…
binfmt_elf.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
2011-03-23 20:51:42 -07:00
binfmt_em86.c
…
binfmt_flat.c
…
binfmt_misc.c
…
binfmt_script.c
…
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
Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block
2011-03-24 10:16:26 -07:00
block_dev.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
2011-03-24 19:01:30 -07:00
buffer.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
2011-03-24 19:01:30 -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
…
compat_ioctl.c
Merge branch 'tty-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6
2011-01-07 14:39:20 -08:00
compat.c
select: remove unused MAX_SELECT_SECONDS
2011-03-21 00:16:08 -04:00
dcache.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
2011-03-18 10:51:11 -07:00
dcookies.c
…
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
fs: move i_sb_list out from under inode_lock
2011-03-24 21:16:32 -04:00
eventfd.c
Docbook: add fs/eventfd.c and fix typos in it
2011-02-21 15:07:04 -08:00
eventpoll.c
epoll: fix compiler warning and optimize the non-blocking path
2011-03-22 17:44:15 -07:00
exec.c
Small typo fix...
2011-03-21 00:16:09 -04:00
fcntl.c
userns: rename is_owner_or_cap to inode_owner_or_capable
2011-03-23 19:47:13 -07:00
fhandle.c
vfs: Add open by file handle support
2011-03-15 02:21:44 -04:00
fifo.c
Filesystem: fifo: Fixed coding style issue.
2011-03-21 00:16:09 -04:00
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
…
filesystems.c
fs: rcu-walk for path lookup
2011-01-07 17:50:27 +11:00
fs_struct.c
sanitize vfsmount refcounting changes
2011-01-16 13:47:07 -05:00
fs-writeback.c
fs: pull inode->i_lock up out of writeback_single_inode
2011-03-24 21:17:51 -04:00
generic_acl.c
userns: rename is_owner_or_cap to inode_owner_or_capable
2011-03-23 19:47:13 -07:00
inode.c
fs: fix inode.c kernel-doc warning
2011-03-27 19:30:19 -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 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6
2011-03-16 19:01:29 -07:00
Kconfig.binfmt
…
libfs.c
pass default dentry_operations to mount_pseudo()
2011-01-12 20:03:43 -05:00
locks.c
Merge branch 'for-2.6.39' of git://linux-nfs.org/~bfields/linux
2011-03-24 08:20:39 -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
ext2: Resolve 'dereferencing pointer to incomplete type' when enabling EXT2_XATTR_DEBUG
2011-01-10 19:04:08 +01:00
mpage.c
fs: make mpage read/write_pages() plug
2011-03-10 08:52:26 +01:00
namei.c
vfs - check non-mountpoint dentry might block in __follow_mount_rcu()
2011-03-24 14:24:32 -04:00
namespace.c
fs: use appropriate printk priority levels
2011-03-22 17:44:10 -07:00
nfsctl.c
open-style analog of vfs_path_lookup()
2011-03-14 09:15:28 -04:00
no-block.c
…
open.c
fs: Use BUG_ON(!mnt) at dentry_open().
2011-03-21 01:10:41 -04:00
pipe.c
Fix broken "pipe: use event aware wakeups" optimization
2011-01-20 16:21:59 -08:00
pnode.c
fs: scale mntget/mntput
2011-01-07 17:50:33 +11:00
pnode.h
…
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
…
select.c
select: remove unused MAX_SELECT_SECONDS
2011-03-21 00:16:08 -04:00
seq_file.c
…
signalfd.c
…
splice.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
stack.c
…
stat.c
readlinkat(), fchownat() and fstatat() with empty relative pathnames
2011-03-15 02:21:45 -04:00
statfs.c
clean statfs-like syscalls up
2011-03-14 09:15:28 -04:00
super.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
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
…
utimes.c
userns: rename is_owner_or_cap to inode_owner_or_capable
2011-03-23 19:47:13 -07:00
xattr_acl.c
…
xattr.c
userns: rename is_owner_or_cap to inode_owner_or_capable
2011-03-23 19:47:13 -07:00