[BUG]2.6.27.y some contents lost after writing to mmaped file

[JiSheng Zhang]

Hi,

I triggered a failure in an fs test with fsx-linux from ltp. It seems that
fsx-linux failed at mmap->write sequence.

Tested kernel is 2.6.27.12 and 2.6.27.39
Tested file system: ext3, tmpfs.
IMHO, it impacts all file systems.

Some fsx-linux log is:

READ BAD DATA: offset = 0x2771b, size = 0xa28e
OFFSET  GOOD    BAD     RANGE
0x287e0 0x35c9  0x15a9     0x80
operation# (mod 256) for the bad datamay be 21
...
7828: 1257514978.306753 READ     0x23dba thru 0x25699 (0x18e0 bytes)
7829: 1257514978.306899 MAPWRITE 0x27eeb thru 0x2a516 (0x262c bytes)
 ******WWWW
7830: 1257514978.307504 READ     0x2771b thru 0x319a8 (0xa28e bytes)
 ***RRRR***
Correct content saved for comparison
...
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