2006-10-11 01:20:50 -07:00
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2006-10-11 01:20:53 -07:00
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2006-10-11 01:20:50 -07:00
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2006-10-11 01:20:53 -07:00
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2006-10-11 01:20:50 -07:00
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2009-06-13 10:09:48 -04:00
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2015-09-08 14:58:40 -07:00
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2010-03-03 09:05:07 -05:00
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2012-11-08 21:57:40 -05:00
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2015-02-22 08:58:50 -08:00
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2008-04-29 18:13:32 -04:00
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2006-10-11 01:20:50 -07:00
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2006-10-11 01:20:53 -07:00
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2006-10-11 01:20:50 -07:00
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2008-09-08 22:25:24 -04:00
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2006-10-11 01:20:50 -07:00
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2010-01-24 14:34:07 -05:00
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2009-02-24 08:21:14 -05:00
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2010-01-24 14:34:07 -05:00
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2009-02-24 08:21:14 -05:00
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2006-10-11 01:20:50 -07:00
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2009-03-27 22:36:43 -04:00
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2006-10-11 01:20:50 -07:00
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2008-01-28 23:58:26 -05:00
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2008-10-10 09:40:52 -04:00
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2008-01-28 23:58:26 -05:00
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2006-10-11 01:20:50 -07:00
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2006-10-11 01:20:53 -07:00
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2006-10-11 01:20:50 -07:00
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2014-05-12 10:50:23 -04:00
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|
ext4: serialize unaligned asynchronous DIO
ext4 has a data corruption case when doing non-block-aligned
asynchronous direct IO into a sparse file, as demonstrated
by xfstest 240.
The root cause is that while ext4 preallocates space in the
hole, mappings of that space still look "new" and
dio_zero_block() will zero out the unwritten portions. When
more than one AIO thread is going, they both find this "new"
block and race to zero out their portion; this is uncoordinated
and causes data corruption.
Dave Chinner fixed this for xfs by simply serializing all
unaligned asynchronous direct IO. I've done the same here.
The difference is that we only wait on conversions, not all IO.
This is a very big hammer, and I'm not very pleased with
stuffing this into ext4_file_write(). But since ext4 is
DIO_LOCKING, we need to serialize it at this high level.
I tried to move this into ext4_ext_direct_IO, but by then
we have the i_mutex already, and we will wait on the
work queue to do conversions - which must also take the
i_mutex. So that won't work.
This was originally exposed by qemu-kvm installing to
a raw disk image with a normal sector-63 alignment. I've
tested a backport of this patch with qemu, and it does
avoid the corruption. It is also quite a lot slower
(14 min for package installs, vs. 8 min for well-aligned)
but I'll take slow correctness over fast corruption any day.
Mingming suggested that we can track outstanding
conversions, and wait on those so that non-sparse
files won't be affected, and I've implemented that here;
unaligned AIO to nonsparse files won't take a perf hit.
[tytso@mit.edu: Keep the mutex as a hashed array instead
of bloating the ext4 inode]
[tytso@mit.edu: Fix up namespace issues so that global
variables are protected with an "ext4_" prefix.]
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-02-12 08:17:34 -05:00
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2012-09-28 23:24:52 -04:00
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|
ext4: serialize unaligned asynchronous DIO
ext4 has a data corruption case when doing non-block-aligned
asynchronous direct IO into a sparse file, as demonstrated
by xfstest 240.
The root cause is that while ext4 preallocates space in the
hole, mappings of that space still look "new" and
dio_zero_block() will zero out the unwritten portions. When
more than one AIO thread is going, they both find this "new"
block and race to zero out their portion; this is uncoordinated
and causes data corruption.
Dave Chinner fixed this for xfs by simply serializing all
unaligned asynchronous direct IO. I've done the same here.
The difference is that we only wait on conversions, not all IO.
This is a very big hammer, and I'm not very pleased with
stuffing this into ext4_file_write(). But since ext4 is
DIO_LOCKING, we need to serialize it at this high level.
I tried to move this into ext4_ext_direct_IO, but by then
we have the i_mutex already, and we will wait on the
work queue to do conversions - which must also take the
i_mutex. So that won't work.
This was originally exposed by qemu-kvm installing to
a raw disk image with a normal sector-63 alignment. I've
tested a backport of this patch with qemu, and it does
avoid the corruption. It is also quite a lot slower
(14 min for package installs, vs. 8 min for well-aligned)
but I'll take slow correctness over fast corruption any day.
Mingming suggested that we can track outstanding
conversions, and wait on those so that non-sparse
files won't be affected, and I've implemented that here;
unaligned AIO to nonsparse files won't take a perf hit.
[tytso@mit.edu: Keep the mutex as a hashed array instead
of bloating the ext4 inode]
[tytso@mit.edu: Fix up namespace issues so that global
variables are protected with an "ext4_" prefix.]
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-02-12 08:17:34 -05:00
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2014-04-17 16:09:22 -04:00
|
|
|
|
ext4: serialize unaligned asynchronous DIO
ext4 has a data corruption case when doing non-block-aligned
asynchronous direct IO into a sparse file, as demonstrated
by xfstest 240.
The root cause is that while ext4 preallocates space in the
hole, mappings of that space still look "new" and
dio_zero_block() will zero out the unwritten portions. When
more than one AIO thread is going, they both find this "new"
block and race to zero out their portion; this is uncoordinated
and causes data corruption.
Dave Chinner fixed this for xfs by simply serializing all
unaligned asynchronous direct IO. I've done the same here.
The difference is that we only wait on conversions, not all IO.
This is a very big hammer, and I'm not very pleased with
stuffing this into ext4_file_write(). But since ext4 is
DIO_LOCKING, we need to serialize it at this high level.
I tried to move this into ext4_ext_direct_IO, but by then
we have the i_mutex already, and we will wait on the
work queue to do conversions - which must also take the
i_mutex. So that won't work.
This was originally exposed by qemu-kvm installing to
a raw disk image with a normal sector-63 alignment. I've
tested a backport of this patch with qemu, and it does
avoid the corruption. It is also quite a lot slower
(14 min for package installs, vs. 8 min for well-aligned)
but I'll take slow correctness over fast corruption any day.
Mingming suggested that we can track outstanding
conversions, and wait on those so that non-sparse
files won't be affected, and I've implemented that here;
unaligned AIO to nonsparse files won't take a perf hit.
[tytso@mit.edu: Keep the mutex as a hashed array instead
of bloating the ext4 inode]
[tytso@mit.edu: Fix up namespace issues so that global
variables are protected with an "ext4_" prefix.]
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-02-12 08:17:34 -05:00
|
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|
2014-04-12 12:45:25 -04:00
|
|
|
|
ext4: serialize unaligned asynchronous DIO
ext4 has a data corruption case when doing non-block-aligned
asynchronous direct IO into a sparse file, as demonstrated
by xfstest 240.
The root cause is that while ext4 preallocates space in the
hole, mappings of that space still look "new" and
dio_zero_block() will zero out the unwritten portions. When
more than one AIO thread is going, they both find this "new"
block and race to zero out their portion; this is uncoordinated
and causes data corruption.
Dave Chinner fixed this for xfs by simply serializing all
unaligned asynchronous direct IO. I've done the same here.
The difference is that we only wait on conversions, not all IO.
This is a very big hammer, and I'm not very pleased with
stuffing this into ext4_file_write(). But since ext4 is
DIO_LOCKING, we need to serialize it at this high level.
I tried to move this into ext4_ext_direct_IO, but by then
we have the i_mutex already, and we will wait on the
work queue to do conversions - which must also take the
i_mutex. So that won't work.
This was originally exposed by qemu-kvm installing to
a raw disk image with a normal sector-63 alignment. I've
tested a backport of this patch with qemu, and it does
avoid the corruption. It is also quite a lot slower
(14 min for package installs, vs. 8 min for well-aligned)
but I'll take slow correctness over fast corruption any day.
Mingming suggested that we can track outstanding
conversions, and wait on those so that non-sparse
files won't be affected, and I've implemented that here;
unaligned AIO to nonsparse files won't take a perf hit.
[tytso@mit.edu: Keep the mutex as a hashed array instead
of bloating the ext4 inode]
[tytso@mit.edu: Fix up namespace issues so that global
variables are protected with an "ext4_" prefix.]
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-02-12 08:17:34 -05:00
|
|
|
|
|
|
|
|
|
2014-04-17 16:09:22 -04:00
|
|
|
|
ext4: serialize unaligned asynchronous DIO
ext4 has a data corruption case when doing non-block-aligned
asynchronous direct IO into a sparse file, as demonstrated
by xfstest 240.
The root cause is that while ext4 preallocates space in the
hole, mappings of that space still look "new" and
dio_zero_block() will zero out the unwritten portions. When
more than one AIO thread is going, they both find this "new"
block and race to zero out their portion; this is uncoordinated
and causes data corruption.
Dave Chinner fixed this for xfs by simply serializing all
unaligned asynchronous direct IO. I've done the same here.
The difference is that we only wait on conversions, not all IO.
This is a very big hammer, and I'm not very pleased with
stuffing this into ext4_file_write(). But since ext4 is
DIO_LOCKING, we need to serialize it at this high level.
I tried to move this into ext4_ext_direct_IO, but by then
we have the i_mutex already, and we will wait on the
work queue to do conversions - which must also take the
i_mutex. So that won't work.
This was originally exposed by qemu-kvm installing to
a raw disk image with a normal sector-63 alignment. I've
tested a backport of this patch with qemu, and it does
avoid the corruption. It is also quite a lot slower
(14 min for package installs, vs. 8 min for well-aligned)
but I'll take slow correctness over fast corruption any day.
Mingming suggested that we can track outstanding
conversions, and wait on those so that non-sparse
files won't be affected, and I've implemented that here;
unaligned AIO to nonsparse files won't take a perf hit.
[tytso@mit.edu: Keep the mutex as a hashed array instead
of bloating the ext4 inode]
[tytso@mit.edu: Fix up namespace issues so that global
variables are protected with an "ext4_" prefix.]
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-02-12 08:17:34 -05:00
|
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|
2006-10-11 01:20:50 -07:00
|
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|
|
2014-04-17 16:09:22 -04:00
|
|
|
|
2006-10-11 01:20:50 -07:00
|
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|
|
2014-04-21 14:26:28 -04:00
|
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|
2013-01-23 17:07:38 -05:00
|
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|
2014-04-21 14:36:30 -04:00
|
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|
2014-04-21 14:26:57 -04:00
|
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|
|
2015-04-09 13:52:01 -04:00
|
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|
2014-04-21 14:26:57 -04:00
|
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|
|
2012-05-28 18:06:51 -04:00
|
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2014-04-21 14:26:28 -04:00
|
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2014-04-21 14:37:52 -04:00
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2015-04-09 13:52:01 -04:00
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2015-04-07 14:48:22 -04:00
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2014-04-21 14:37:52 -04:00
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2015-04-09 12:55:47 -04:00
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2015-04-07 14:48:22 -04:00
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2014-04-21 14:37:52 -04:00
|
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2008-01-28 23:58:27 -05:00
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2010-05-16 22:00:00 -04:00
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2008-01-28 23:58:27 -05:00
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2015-04-09 12:55:47 -04:00
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|
2014-04-21 14:37:52 -04:00
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|
2015-04-07 14:48:22 -04:00
|
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|
2014-04-21 14:37:52 -04:00
|
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2015-04-09 12:55:47 -04:00
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|
2008-01-28 23:58:27 -05:00
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2014-10-30 10:53:16 -04:00
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2014-04-21 14:36:30 -04:00
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2015-04-09 12:55:47 -04:00
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2014-04-21 14:26:57 -04:00
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2014-04-21 14:36:30 -04:00
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2014-04-21 14:26:57 -04:00
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2014-04-21 14:37:52 -04:00
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2014-04-21 14:26:57 -04:00
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2014-04-17 16:09:22 -04:00
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2014-04-21 14:36:30 -04:00
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2014-04-21 14:26:57 -04:00
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2014-04-21 14:36:30 -04:00
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2014-04-21 14:26:57 -04:00
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2014-04-21 14:36:30 -04:00
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2014-04-21 14:26:57 -04:00
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2015-04-07 14:48:22 -04:00
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2014-04-21 14:36:30 -04:00
|
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|
|
|
|
|
|
|
ext4: serialize unaligned asynchronous DIO
ext4 has a data corruption case when doing non-block-aligned
asynchronous direct IO into a sparse file, as demonstrated
by xfstest 240.
The root cause is that while ext4 preallocates space in the
hole, mappings of that space still look "new" and
dio_zero_block() will zero out the unwritten portions. When
more than one AIO thread is going, they both find this "new"
block and race to zero out their portion; this is uncoordinated
and causes data corruption.
Dave Chinner fixed this for xfs by simply serializing all
unaligned asynchronous direct IO. I've done the same here.
The difference is that we only wait on conversions, not all IO.
This is a very big hammer, and I'm not very pleased with
stuffing this into ext4_file_write(). But since ext4 is
DIO_LOCKING, we need to serialize it at this high level.
I tried to move this into ext4_ext_direct_IO, but by then
we have the i_mutex already, and we will wait on the
work queue to do conversions - which must also take the
i_mutex. So that won't work.
This was originally exposed by qemu-kvm installing to
a raw disk image with a normal sector-63 alignment. I've
tested a backport of this patch with qemu, and it does
avoid the corruption. It is also quite a lot slower
(14 min for package installs, vs. 8 min for well-aligned)
but I'll take slow correctness over fast corruption any day.
Mingming suggested that we can track outstanding
conversions, and wait on those so that non-sparse
files won't be affected, and I've implemented that here;
unaligned AIO to nonsparse files won't take a perf hit.
[tytso@mit.edu: Keep the mutex as a hashed array instead
of bloating the ext4 inode]
[tytso@mit.edu: Fix up namespace issues so that global
variables are protected with an "ext4_" prefix.]
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-02-12 08:17:34 -05:00
|
|
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|
2006-10-11 01:20:50 -07:00
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2015-02-16 15:59:38 -08:00
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2015-06-04 09:18:18 +10:00
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2015-09-08 14:59:11 -07:00
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2015-06-04 09:18:18 +10:00
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2015-02-16 15:59:38 -08:00
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2015-09-08 14:59:22 -07:00
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2015-02-16 15:59:38 -08:00
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2015-09-08 14:59:03 -07:00
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2015-09-08 14:59:22 -07:00
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2015-09-08 14:59:03 -07:00
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2015-02-16 15:59:38 -08:00
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2015-09-08 14:59:20 -07:00
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2015-09-08 14:59:11 -07:00
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2015-02-16 15:59:38 -08:00
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2015-09-08 14:59:03 -07:00
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2015-02-16 15:59:38 -08:00
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2015-04-15 16:15:14 -07:00
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2015-02-16 15:59:38 -08:00
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2009-09-27 22:29:37 +04:00
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2008-07-11 19:27:31 -04:00
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2014-04-07 15:37:19 -07:00
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2008-07-11 19:27:31 -04:00
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2015-04-12 00:56:10 -04:00
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ext4 crypto: reorganize how we store keys in the inode
This is a pretty massive patch which does a number of different things:
1) The per-inode encryption information is now stored in an allocated
data structure, ext4_crypt_info, instead of directly in the node.
This reduces the size usage of an in-memory inode when it is not
using encryption.
2) We drop the ext4_fname_crypto_ctx entirely, and use the per-inode
encryption structure instead. This remove an unnecessary memory
allocation and free for the fname_crypto_ctx as well as allowing us
to reuse the ctfm in a directory for multiple lookups and file
creations.
3) We also cache the inode's policy information in the ext4_crypt_info
structure so we don't have to continually read it out of the
extended attributes.
4) We now keep the keyring key in the inode's encryption structure
instead of releasing it after we are done using it to derive the
per-inode key. This allows us to test to see if the key has been
revoked; if it has, we prevent the use of the derived key and free
it.
5) When an inode is released (or when the derived key is freed), we
will use memset_explicit() to zero out the derived key, so it's not
left hanging around in memory. This implies that when a user logs
out, it is important to first revoke the key, and then unlink it,
and then finally, to use "echo 3 > /proc/sys/vm/drop_caches" to
release any decrypted pages and dcache entries from the system
caches.
6) All this, and we also shrink the number of lines of code by around
100. :-)
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2015-05-18 13:17:47 -04:00
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2015-04-12 00:56:10 -04:00
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2015-05-31 13:35:39 -04:00
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2015-04-12 00:56:10 -04:00
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2008-07-11 19:27:31 -04:00
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2015-02-16 15:59:38 -08:00
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2015-09-08 14:59:03 -07:00
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2015-02-16 15:59:38 -08:00
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2008-07-11 19:27:31 -04:00
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2009-06-13 10:09:48 -04:00
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2015-04-12 00:56:10 -04:00
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2009-06-13 10:09:48 -04:00
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2010-01-23 20:10:29 -05:00
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2009-06-13 10:09:48 -04:00
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2012-07-22 20:31:31 -04:00
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2013-02-08 21:59:22 -05:00
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2012-07-22 20:31:31 -04:00
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2014-05-12 22:06:43 -04:00
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2012-07-22 20:31:31 -04:00
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2011-10-25 09:18:41 -04:00
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2012-07-22 20:31:31 -04:00
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2009-06-13 10:09:48 -04:00
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2015-05-31 13:35:39 -04:00
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2011-01-10 12:29:43 -05:00
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2013-08-16 21:19:41 -04:00
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2015-04-12 00:56:10 -04:00
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2013-08-16 21:19:41 -04:00
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2011-01-10 12:29:43 -05:00
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2015-05-31 13:35:39 -04:00
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2009-06-13 10:09:48 -04:00
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2012-11-08 21:57:40 -05:00
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2015-01-02 15:16:00 -05:00
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2012-11-08 21:57:40 -05:00
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2015-01-02 15:16:00 -05:00
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2012-11-08 21:57:40 -05:00
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2015-01-02 15:16:00 -05:00
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2012-11-08 21:57:40 -05:00
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2015-01-02 15:16:00 -05:00
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2012-11-08 21:57:40 -05:00
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2015-01-02 15:16:00 -05:00
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2012-11-08 21:57:40 -05:00
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2012-12-17 15:59:39 -08:00
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2012-11-08 21:57:40 -05:00
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2012-12-17 15:59:39 -08:00
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2012-11-08 21:57:40 -05:00
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2012-12-17 15:59:39 -08:00
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2012-11-08 21:57:40 -05:00
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2012-12-17 15:59:39 -08:00
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2012-11-08 21:57:40 -05:00
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2012-12-17 15:59:39 -08:00
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2012-11-08 21:57:40 -05:00
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2012-12-17 15:59:39 -08:00
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2012-11-08 21:57:40 -05:00
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2012-12-17 15:59:39 -08:00
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2012-11-08 21:57:40 -05:00
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2015-01-02 15:16:00 -05:00
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2012-11-08 21:57:40 -05:00
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2015-01-02 15:16:00 -05:00
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2012-11-08 21:57:40 -05:00
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2015-01-02 15:16:00 -05:00
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2012-11-08 21:57:40 -05:00
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2015-01-02 15:16:00 -05:00
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2012-11-08 21:57:40 -05:00
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2015-01-02 15:16:00 -05:00
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2012-11-08 21:57:40 -05:00
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2015-01-02 15:16:00 -05:00
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2012-11-08 21:57:40 -05:00
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2015-01-02 15:16:00 -05:00
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2012-11-08 21:57:40 -05:00
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2015-01-02 15:16:00 -05:00
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2012-11-08 21:57:40 -05:00
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2015-01-02 15:16:00 -05:00
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2012-11-08 21:57:40 -05:00
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2015-01-02 15:16:00 -05:00
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2012-11-08 21:57:40 -05:00
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2015-01-02 15:16:00 -05:00
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2012-11-08 21:57:40 -05:00
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2015-01-02 15:16:00 -05:00
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2012-11-08 21:57:40 -05:00
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2015-01-02 15:16:00 -05:00
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2012-11-08 21:57:40 -05:00
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2015-01-02 15:16:00 -05:00
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2012-11-08 21:57:40 -05:00
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2015-01-02 15:16:00 -05:00
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2012-11-08 21:57:40 -05:00
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2010-10-27 21:30:06 -04:00
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2012-04-30 13:14:03 -05:00
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2010-10-27 21:30:06 -04:00
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2012-12-17 15:59:39 -08:00
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2010-10-27 21:30:06 -04:00
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2012-12-17 15:59:39 -08:00
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2012-11-08 21:57:40 -05:00
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2012-12-17 15:59:39 -08:00
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2012-11-08 21:57:40 -05:00
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2010-10-27 21:30:06 -04:00
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2006-10-11 01:20:53 -07:00
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2010-10-27 21:30:06 -04:00
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2014-04-02 14:33:16 -04:00
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2014-04-17 16:09:22 -04:00
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2008-04-29 22:03:54 -04:00
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2006-10-11 01:20:50 -07:00
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2006-10-11 01:20:53 -07:00
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2006-10-11 01:20:50 -07:00
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2008-07-11 19:27:31 -04:00
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2009-06-13 10:09:48 -04:00
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2006-10-11 01:20:53 -07:00
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2006-10-11 01:20:50 -07:00
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2014-04-05 04:27:08 -04:00
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2011-01-14 13:07:43 +01:00
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2006-10-11 01:20:50 -07:00
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2007-02-12 00:55:38 -08:00
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2006-10-11 01:20:53 -07:00
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2008-07-11 19:27:31 -04:00
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2006-10-11 01:20:50 -07:00
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2006-10-11 01:20:53 -07:00
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2006-10-11 01:20:50 -07:00
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2011-07-23 17:37:31 +02:00
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2013-12-20 05:16:44 -08:00
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2008-10-07 00:46:36 -04:00
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2006-10-11 01:20:50 -07:00
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