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generic: add mmap write vs truncate/remap test

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This test exposed a problem with mapped writes to the tail page of a
file in XFS and potentially ext4. Eric did all the hard work of
taking the bug report and generating the reproducable test case on
ext4.  Make it a generic test so that we can ensure that all
filesystems handle the case correctly.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Dave Chinner
2014-09-29 12:57:37 +10:00
parent d7b517da5f
commit 10b49039a5
3 changed files with 202 additions and 0 deletions
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tests/generic/030.out
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QA output created by 030
wrote 5137408/5137408 bytes at offset 0
XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
==== Pre-Remount ===
00000000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 |XXXXXXXXXXXXXXXX|
*
004e6400 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 |YYYYYYYYYYYYYYYY|
*
004e7000
==== Post-Remount ==
00000000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 |XXXXXXXXXXXXXXXX|
*
004e6400 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 |YYYYYYYYYYYYYYYY|
*
004e7000
wrote 5137408/5137408 bytes at offset 0
XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
==== Pre-Remount ===
00000000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 |XXXXXXXXXXXXXXXX|
*
004e6000 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a |ZZZZZZZZZZZZZZZZ|
*
004e6400 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 |YYYYYYYYYYYYYYYY|
*
004e7000
==== Post-Remount ==
00000000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 |XXXXXXXXXXXXXXXX|
*
004e6000 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a |ZZZZZZZZZZZZZZZZ|
*
004e6400 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 |YYYYYYYYYYYYYYYY|
*
004e7000
wrote 5136912/5136912 bytes at offset 0
XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
==== Pre-Remount ===
00000000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 |XXXXXXXXXXXXXXXX|
*
004e6210 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 |YYYYYYYYYYYYYYYY|
*
004e6d00 59 59 59 59 59 59 59 59 00 00 00 00 00 00 00 00 |YYYYYYYY........|
004e6d10 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
004e7000
==== Post-Remount ==
00000000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 |XXXXXXXXXXXXXXXX|
*
004e6210 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 |YYYYYYYYYYYYYYYY|
*
004e6d00 59 59 59 59 59 59 59 59 00 00 00 00 00 00 00 00 |YYYYYYYY........|
004e6d10 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
004e7000