XFS fsync() doesn't work under 2.4.26

[Szima Gábor]

Hi,

fsync() take no effect on XFS filesystem under Linux kernel 2.4.26.

Simple open-write-fsync-close test:

ltrace -t /tmp/synctest:
...
  0.002144 write(3, "", 1048576)                  = 1048576
  0.002150 write(3, "", 1048576)                  = 1048576
  0.002154 fsync(3, 0xbfeff684, 0x00100000, 0, 0) = 0
  0.015962 close(3)                               = 0
  ^^^^^^^^

(64 x 1 MB data, ~8 MB/s disk write speed)


Under 2.4.25 or on other fs working fine:
...
  0.002149 write(3, "", 1048576)                  = 1048576
  0.002744 write(3, "", 1048576)                  = 1048576
  0.002188 fsync(3, 0xbfeff664, 0x00100000, 0, 0) = 0
  8.048844 close(3)                               = 0
  ^^^^^^^^

System:
Linux 2.4.26 (gcc-3.3.3), SuSE 7.3
Asus A7N8X, Adaptec 29160 (7892A), WD Enterprise 4360
(WDE4360-1808A2)



								-Sygma
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