By the way, is it normal when the file is moved around after the preallocated region is filled with data?
$ uname -r
2.6.32-220.7.1.el6.x86_64
$fallocate -n --offset 0 -l 1G file ---->Write a little more data than the preallocated size
$ xfs_bmap -p -vv file
file:
EXT: FILE-OFFSET BLOCK-RANGE AG AG-OFFSET TOTAL FLAGS
0: [0..2097151]: 2593408088..2595505239 21 (29420144..31517295) 2097152 10000
$ dd if=/dev/zero of=/tmp/file bs=1M count=1026 conv=fsync
$ xfs_bmap -p -vv file
file:
EXT: FILE-OFFSET BLOCK-RANGE AG AG-OFFSET TOTAL FLAGS
0: [0..4194303]: 2709184016..2713378319 22 (23101408..27295711) 4194304 00000
$ du -h --apparent-size file
1.1G file
$du -h file
2.0G
best regards,
韩竹(Zhu Han)
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