Dmitry Monakhov 1c9114f9c0 ext4: serialize unlocked dio reads with truncate ...

Current serialization will works only for DIO which holds
i_mutex, but nonlocked DIO following race is possible:

dio_nolock_read_task            truncate_task
				->ext4_setattr()
				 ->inode_dio_wait()
->ext4_ext_direct_IO
  ->ext4_ind_direct_IO
    ->__blockdev_direct_IO
      ->ext4_get_block
				 ->truncate_setsize()
				 ->ext4_truncate()
				 #alloc truncated blocks
				 #to other inode
      ->submit_io()
     #INFORMATION LEAK

In order to serialize with unlocked DIO reads we have to
rearrange wait sequence
1) update i_size first
2) if i_size about to be reduced wait for outstanding DIO requests
3) and only after that truncate inode blocks

Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

2012-09-29 00:55:23 -04:00

..

acl.c

switch posix_acl_equiv_mode() to umode_t *

2011-08-01 02:10:06 -04:00

acl.h

fs: take the ACL checks to common code

2011-07-25 14:30:23 -04:00

balloc.c

ext4: don't call ext4_error while block group is locked

2012-08-17 09:06:06 -04:00

bitmap.c

ext4: don't call ext4_error while block group is locked

2012-08-17 09:06:06 -04:00

block_validity.c

ext2/3/4: delete unneeded includes of module.h

2012-01-09 13:52:10 +01:00

dir.c

ext4: use core vfs llseek code for dir seeks

2012-07-23 00:00:28 +04:00

ext4_extents.h

ext4: verify and calculate checksums for extent tree blocks

2012-04-29 18:37:10 -04:00

ext4_jbd2.c

ext4: remove unnecessary argument from __ext4_handle_dirty_metadata()

2012-07-22 20:37:31 -04:00

ext4_jbd2.h

ext4: remove unnecessary argument from __ext4_handle_dirty_metadata()

2012-07-22 20:37:31 -04:00

ext4.h

ext4: serialize dio nonlocked reads with defrag workers

2012-09-29 00:41:21 -04:00

extents.c

ext4: completed_io locking cleanup

2012-09-29 00:14:55 -04:00

file.c

ext4: give i_aiodio_unwritten a more appropriate name

2012-09-28 23:24:52 -04:00

fsync.c

ext4: completed_io locking cleanup

2012-09-29 00:14:55 -04:00

hash.c

ext4: return 32/64-bit dir name hash according to usage type

2012-03-18 22:44:40 -04:00

ialloc.c

ext4: check free inode count before allocating an inode

2012-09-23 23:16:03 -04:00

indirect.c

ext4: serialize dio nonlocked reads with defrag workers

2012-09-29 00:41:21 -04:00

inode.c

ext4: serialize unlocked dio reads with truncate

2012-09-29 00:55:23 -04:00

ioctl.c

ext4: release donor reference when EXT4_IOC_MOVE_EXT ioctl fails

2012-09-26 22:58:50 -04:00

Kconfig

ext4: load the crc32c driver if necessary

2012-04-29 18:27:10 -04:00

Makefile

ext4: move ext4_ind_* functions from inode.c to indirect.c

2011-06-27 19:40:50 -04:00

mballoc.c

ext4: enable FITRIM ioctl on bigalloc file system

2012-09-26 22:21:21 -04:00

mballoc.h

ext4: remove unused macro MB_DEFAULT_MAX_GROUPS_TO_SCAN

2012-08-17 10:00:17 -04:00

migrate.c

userns: Convert ext4 to user kuid/kgid where appropriate

2012-05-15 14:59:27 -07:00

mmp.c

ext4: Convert to new freezing mechanism

2012-07-31 09:45:48 +04:00

move_extent.c

ext4: serialize dio nonlocked reads with defrag workers

2012-09-29 00:41:21 -04:00

namei.c

ext4: ext4_bread usage audit

2012-09-27 09:31:33 -04:00

page-io.c

ext4: completed_io locking cleanup

2012-09-29 00:14:55 -04:00

resize.c

ext4: don't call update_backups() multiple times for the same bg

2012-09-26 00:08:57 -04:00

super.c

ext4: give i_aiodio_unwritten a more appropriate name

2012-09-28 23:24:52 -04:00

symlink.c

ext4: symlink must be handled via filesystem specific operation

2010-05-16 02:00:00 -04:00

truncate.h

ext4: move common truncate functions to header file

2011-06-27 19:16:04 -04:00

xattr_security.c

Merge branch 'for_linus' into for_linus_merged

2012-01-10 11:54:07 -05:00

xattr_trusted.c

ext2/3/4: delete unneeded includes of module.h

2012-01-09 13:52:10 +01:00

xattr_user.c

ext2/3/4: delete unneeded includes of module.h

2012-01-09 13:52:10 +01:00

xattr.c

ext4: use s_csum_seed instead of i_csum_seed for xattr block

2012-07-09 16:29:27 -04:00

xattr.h

ext4: change on-disk layout to support extended metadata checksumming

2012-04-29 18:23:10 -04:00