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Theodore Ts'o fab3a549e2 ext4: Fix potential fiemap deadlock (mmap_sem vs. i_data_sem) 
Fix the following potential circular locking dependency between
mm->mmap_sem and ei->i_data_sem:

    =======================================================
    [ INFO: possible circular locking dependency detected ]
    2.6.32-04115-gec044c5 #37
    -------------------------------------------------------
    ureadahead/1855 is trying to acquire lock:
     (&mm->mmap_sem){++++++}, at: [<ffffffff81107224>] might_fault+0x5c/0xac

    but task is already holding lock:
     (&ei->i_data_sem){++++..}, at: [<ffffffff811be1fd>] ext4_fiemap+0x11b/0x159

    which lock already depends on the new lock.

    the existing dependency chain (in reverse order) is:

    -> #1 (&ei->i_data_sem){++++..}:
           [<ffffffff81099bfa>] __lock_acquire+0xb67/0xd0f
           [<ffffffff81099e7e>] lock_acquire+0xdc/0x102
           [<ffffffff81516633>] down_read+0x51/0x84
           [<ffffffff811a2414>] ext4_get_blocks+0x50/0x2a5
           [<ffffffff811a3453>] ext4_get_block+0xab/0xef
           [<ffffffff81154f39>] do_mpage_readpage+0x198/0x48d
           [<ffffffff81155360>] mpage_readpages+0xd0/0x114
           [<ffffffff811a104b>] ext4_readpages+0x1d/0x1f
           [<ffffffff810f8644>] __do_page_cache_readahead+0x12f/0x1bc
           [<ffffffff810f86f2>] ra_submit+0x21/0x25
           [<ffffffff810f0cfd>] filemap_fault+0x19f/0x32c
           [<ffffffff81107b97>] __do_fault+0x55/0x3a2
           [<ffffffff81109db0>] handle_mm_fault+0x327/0x734
           [<ffffffff8151aaa9>] do_page_fault+0x292/0x2aa
           [<ffffffff81518205>] page_fault+0x25/0x30
           [<ffffffff812a34d8>] clear_user+0x38/0x3c
           [<ffffffff81167e16>] padzero+0x20/0x31
           [<ffffffff81168b47>] load_elf_binary+0x8bc/0x17ed
           [<ffffffff81130e95>] search_binary_handler+0xc2/0x259
           [<ffffffff81166d64>] load_script+0x1b8/0x1cc
           [<ffffffff81130e95>] search_binary_handler+0xc2/0x259
           [<ffffffff8113255f>] do_execve+0x1ce/0x2cf
           [<ffffffff81027494>] sys_execve+0x43/0x5a
           [<ffffffff8102918a>] stub_execve+0x6a/0xc0

    -> #0 (&mm->mmap_sem){++++++}:
           [<ffffffff81099aa4>] __lock_acquire+0xa11/0xd0f
           [<ffffffff81099e7e>] lock_acquire+0xdc/0x102
           [<ffffffff81107251>] might_fault+0x89/0xac
           [<ffffffff81139382>] fiemap_fill_next_extent+0x95/0xda
           [<ffffffff811bcb43>] ext4_ext_fiemap_cb+0x138/0x157
           [<ffffffff811be069>] ext4_ext_walk_space+0x178/0x1f1
           [<ffffffff811be21e>] ext4_fiemap+0x13c/0x159
           [<ffffffff811390e6>] do_vfs_ioctl+0x348/0x4d6
           [<ffffffff811392ca>] sys_ioctl+0x56/0x79
           [<ffffffff81028cb2>] system_call_fastpath+0x16/0x1b

    other info that might help us debug this:

    1 lock held by ureadahead/1855:
     #0:  (&ei->i_data_sem){++++..}, at: [<ffffffff811be1fd>] ext4_fiemap+0x11b/0x159

    stack backtrace:
    Pid: 1855, comm: ureadahead Not tainted 2.6.32-04115-gec044c5 #37
    Call Trace:
     [<ffffffff81098c70>] print_circular_bug+0xa8/0xb7
     [<ffffffff81099aa4>] __lock_acquire+0xa11/0xd0f
     [<ffffffff8102f229>] ? sched_clock+0x9/0xd
     [<ffffffff81099e7e>] lock_acquire+0xdc/0x102
     [<ffffffff81107224>] ? might_fault+0x5c/0xac
     [<ffffffff81107251>] might_fault+0x89/0xac
     [<ffffffff81107224>] ? might_fault+0x5c/0xac
     [<ffffffff81124b44>] ? __kmalloc+0x13b/0x18c
     [<ffffffff81139382>] fiemap_fill_next_extent+0x95/0xda
     [<ffffffff811bcb43>] ext4_ext_fiemap_cb+0x138/0x157
     [<ffffffff811bca0b>] ? ext4_ext_fiemap_cb+0x0/0x157
     [<ffffffff811be069>] ext4_ext_walk_space+0x178/0x1f1
     [<ffffffff811be21e>] ext4_fiemap+0x13c/0x159
     [<ffffffff81107224>] ? might_fault+0x5c/0xac
     [<ffffffff811390e6>] do_vfs_ioctl+0x348/0x4d6
     [<ffffffff8129f6d0>] ? __up_read+0x8d/0x95
     [<ffffffff81517fb5>] ? retint_swapgs+0x13/0x1b
     [<ffffffff811392ca>] sys_ioctl+0x56/0x79
     [<ffffffff81028cb2>] system_call_fastpath+0x16/0x1b

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2009-12-09 21:30:02 -05:00
..
9p 9p: fix readdir corner cases 2009-11-02 08:43:45 -06:00
adfs adfs: remove redundant test on unsigned 2009-09-24 07:21:05 -07:00
affs affs: add ->sync_fs 2009-06-11 21:36:14 -04:00
afs afs: remove cache.h 2009-10-01 16:11:16 -07:00
autofs trivial: remove unnecessary semicolons 2009-09-21 15:14:58 +02:00
autofs4 autofs4 - fix missed case when changing to use struct path 2009-08-31 17:44:05 -10:00
befs fs: Make unload_nls() NULL pointer safe 2009-09-24 07:47:42 -04:00
bfs headers: smp_lock.h redux 2009-07-12 12:22:34 -07:00
btrfs Merge git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable 2009-11-11 13:38:59 -08:00
cachefiles enforce ->sync_fs is only called for rw superblock 2009-06-11 21:36:06 -04:00
cifs cifs: don't use CIFSGetSrvInodeNumber in is_path_accessible 2009-11-06 22:06:14 +00:00
coda headers: remove sched.h from poll.h 2009-10-04 15:05:10 -07:00
configfs writeback: add name to backing_dev_info 2009-09-11 09:20:26 +02:00
cramfs
debugfs debugfs: use specified mode to possibly mark files read/write only 2009-06-15 21:30:28 -07:00
devpts Move magic numbers into magic.h 2009-09-23 07:39:28 -07:00
dlm dlm: fix socket fd translation 2009-09-30 12:19:44 -05:00
ecryptfs ima: ecryptfs fix imbalance message 2009-10-08 11:31:38 -05:00
efs get rid of BKL in fs/efs 2009-06-17 00:36:36 -04:00
exofs exofs: remove BKL from super operations 2009-09-24 07:47:38 -04:00
exportfs
ext2 Merge branch 'hwpoison' of git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-mce-2.6 2009-09-24 07:53:22 -07:00
ext3 ext3: Wait for proper transaction commit on fsync 2009-11-11 15:22:49 +01:00
ext4 ext4: Fix potential fiemap deadlock (mmap_sem vs. i_data_sem) 2009-12-09 21:30:02 -05:00
fat Merge git://git.kernel.org/pub/scm/linux/kernel/git/hirofumi/fatfs-2.6 2009-09-30 09:31:14 -07:00
freevxfs headers: smp_lock.h redux 2009-07-12 12:22:34 -07:00
fscache FS-Cache: Fixup renamed filenames in comments in internal.h 2009-05-27 10:20:13 -07:00
fuse fuse: invalidate target of rename 2009-11-04 10:24:52 +01:00
gfs2 const: mark struct vm_struct_operations 2009-09-27 11:39:25 -07:00
hfs hfs: fix oops on mount with corrupted btree extent records 2009-10-29 07:39:29 -07:00
hfsplus hfsplus: refuse to mount volumes larger than 2TB 2009-10-29 07:39:27 -07:00
hostfs hostfs: set maximum filesize in superblock for proper LFS support 2009-06-30 18:56:03 -07:00
hpfs headers: smp_lock.h redux 2009-07-12 12:22:34 -07:00
hppfs
hugetlbfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 2009-09-24 08:32:11 -07:00
isofs fs: Make unload_nls() NULL pointer safe 2009-09-24 07:47:42 -04:00
jbd fs/jbd: Export log_start_commit to fix ext3 build. 2009-11-12 10:24:12 +01:00
jbd2 jbd2: Export jbd2_log_start_commit to fix ext4 build 2009-12-09 20:42:53 -05:00
jffs2 Merge git://git.infradead.org/mtd-2.6 2009-09-23 10:07:49 -07:00
jfs fs: Make unload_nls() NULL pointer safe 2009-09-24 07:47:42 -04:00
lockd headers: utsname.h redux 2009-09-23 18:13:10 -07:00
minix V3 minixfs: add missing directory type checking 2009-09-23 07:39:57 -07:00
ncpfs const: mark struct vm_struct_operations 2009-09-27 11:39:25 -07:00
nfs NFSv4: The link() operation should return any delegation on the file 2009-10-26 08:09:46 -04:00
nfs_common
nfsd const: constify remaining file_operations 2009-10-01 16:11:11 -07:00
nilfs2 nilfs2: fix missing cleanup of gc cache on error cases 2009-11-08 19:04:25 +09:00
nls Merge git://git.kernel.org/pub/scm/linux/kernel/git/hirofumi/fatfs-2.6 2009-09-30 09:31:14 -07:00
notify dnotify: ignore FS_EVENT_ON_CHILD 2009-10-20 18:02:33 -04:00
ntfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 2009-09-24 08:32:11 -07:00
ocfs2 const: constify remaining file_operations 2009-10-01 16:11:11 -07:00
omfs const: constify remaining file_operations 2009-10-01 16:11:11 -07:00
openpromfs
partitions block: Seperate read and write statistics of in_flight requests v2 2009-10-06 20:16:55 +02:00
proc pidns: fix a leak in /proc dentries and inodes with pid namespaces. 2009-11-12 07:25:57 -08:00
qnx4 qnx4: remove write support 2009-09-23 07:39:30 -07:00
quota const: make struct super_block::s_qcop const 2009-09-22 07:17:24 -07:00
ramfs truncate: use new helpers 2009-09-24 08:41:47 -04:00
reiserfs const: make struct super_block::s_qcop const 2009-09-22 07:17:24 -07:00
romfs ROMFS: fix length used with romfs_dev_strnlen() function 2009-10-11 11:33:56 -07:00
smbfs fs: Make unload_nls() NULL pointer safe 2009-09-24 07:47:42 -04:00
squashfs const: mark remaining super_operations const 2009-09-22 07:17:24 -07:00
sysfs sysfs: Don't leak secdata when a sysfs_dirent is freed. 2009-11-05 08:19:18 +11:00
sysv get rid of BKL in fs/sysv 2009-06-17 00:36:37 -04:00
ubifs const: mark struct vm_struct_operations 2009-09-27 11:39:25 -07:00
udf udf: Fix possible corruption when close races with write 2009-09-14 19:13:01 +02:00
ufs ufs: sector_t cannot be negative 2009-06-18 13:03:46 -07:00
xfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/fs/xfs/xfs 2009-10-31 12:12:49 -07:00
aio.c aio.c: move EXPORT* macros to line after function 2009-09-23 07:39:29 -07:00
anon_inodes.c headers: remove sched.h from poll.h 2009-10-04 15:05:10 -07:00
attr.c truncate: new helpers 2009-09-24 08:41:47 -04:00
bad_inode.c
binfmt_aout.c
binfmt_elf.c elf: clean up fill_note_info() 2009-09-24 07:21:01 -07:00
binfmt_elf_fdpic.c fdpic: ignore the loader's PT_GNU_STACK when calculating the stack size 2009-09-24 07:21:02 -07:00
binfmt_em86.c
binfmt_flat.c flat: use IS_ERR_VALUE() helper macro 2009-09-24 07:21:03 -07:00
binfmt_misc.c
binfmt_script.c
binfmt_som.c
bio-integrity.c block: Create bip slabs with embedded integrity vectors 2009-07-01 10:56:25 +02:00
bio.c Fix bio_alloc() and bio_kmalloc() documentation 2009-11-02 11:41:13 +01:00
block_dev.c block: use after free bug in __blkdev_get 2009-10-26 15:27:11 +01:00
buffer.c Merge branch 'writeback' of git://git.kernel.dk/linux-2.6-block 2009-09-25 09:27:30 -07:00
char_dev.c fs/char_dev.c: remove useless loop 2009-09-24 07:21:03 -07:00
compat.c x86, fs: Fix x86 procfs stack information for threads on 64-bit 2009-11-04 13:25:03 +01:00
compat_binfmt_elf.c
compat_ioctl.c fs: add missing compat_ptr handling for FS_IOC_RESVSP ioctl 2009-11-12 07:25:57 -08:00
dcache.c sched: Pull up the might_sleep() check into cond_resched() 2009-07-18 15:51:44 +02:00
dcookies.c
direct-io.c block: Do away with the notion of hardsect_size 2009-05-22 23:22:54 +02:00
drop_caches.c sysctl: remove "struct file *" argument of ->proc_handler 2009-09-24 07:21:04 -07:00
eventfd.c anonfd: split interface into file creation and install 2009-09-23 07:39:29 -07:00
eventpoll.c epoll: fix nested calls support 2009-06-18 13:03:41 -07:00
exec.c exec: setup_arg_pages() fails to return errors 2009-11-12 07:25:58 -08:00
fcntl.c fcntl: add F_[SG]ETOWN_EX 2009-09-24 07:21:01 -07:00
fifo.c
file.c headers: remove sched.h from interrupt.h 2009-10-11 11:20:58 -07:00
file_table.c sysctl: remove "struct file *" argument of ->proc_handler 2009-09-24 07:21:04 -07:00
filesystems.c fs: Mark get_filesystem_list() as __init function. 2009-04-20 23:02:52 -04:00
fs-writeback.c writeback: pass in super_block to bdi_start_writeback() 2009-09-26 00:10:40 +02:00
fs_struct.c
generic_acl.c
inode.c vfs: optimize touch_time() too 2009-09-24 07:47:27 -04:00
internal.h fs: fix overflow in sys_mount() for in-kernel calls 2009-09-24 08:40:15 -04:00
ioctl.c __generic_block_fiemap(): fix for files bigger than 4GB 2009-11-12 07:26:01 -08:00
ioprio.c
Kconfig powerpc: Cleanup Kconfig selection of hugetlbfs support 2009-10-30 15:03:54 +11:00
Kconfig.binfmt
libfs.c libfs: return error code on failed attr set 2009-09-24 07:47:30 -04:00
locks.c const: make lock_manager_operations const 2009-09-22 07:17:25 -07:00
Makefile nilfs2: update makefile and Kconfig 2009-04-07 08:31:16 -07:00
mbcache.c
mpage.c ext4: Properly initialize the buffer_head state 2009-05-13 15:13:42 -04:00
namei.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6 2009-09-11 08:55:49 -07:00
namespace.c fs: fix overflow in sys_mount() for in-kernel calls 2009-09-24 08:40:15 -04:00
nfsctl.c
no-block.c
open.c fs: change sys_truncate length parameter type 2009-09-23 09:21:05 -07:00
pipe.c fs: pipe.c null pointer dereference 2009-10-22 08:11:44 +09:00
pnode.c
pnode.h
posix_acl.c
read_write.c vfs: remove redundant position check in do_sendfile 2009-09-24 07:47:34 -04:00
read_write.h
readdir.c
select.c headers: remove sched.h from poll.h 2009-10-04 15:05:10 -07:00
seq_file.c vfs: seq_file: add helpers for data filling 2009-09-24 07:47:35 -04:00
signalfd.c
splice.c Merge branch 'for-2.6.32' of git://git.kernel.dk/linux-2.6-block 2009-09-14 17:55:15 -07:00
stack.c
stat.c kill vfs_stat_fd / vfs_lstat_fd 2009-04-20 23:02:52 -04:00
super.c freeze_bdev: grab active reference to frozen superblocks 2009-09-24 07:47:41 -04:00
sync.c fs/buffer.c: clean up EXPORT* macros 2009-09-23 07:39:29 -07:00
timerfd.c
utimes.c
xattr.c VFS: Factor out part of vfs_setxattr so it can be called from the SELinux hook for inode_setsecctx. 2009-09-10 10:11:22 +10:00
xattr_acl.c