[lustre-discuss] stat

[Andreas Dilger]

It would be useful to add an llapi_ function for this. In connection with LSOM the client will also be able to get the approximate file size, once https://jira.whamcloud.com/browse/LU-11367 is landed.

Cheers, Andreas

On May 1, 2019, at 09:35, Nathaniel Clark <nclark at whamcloud.com<mailto:nclark at whamcloud.com>> wrote:

You should look at the IOC_MDC_GETFILEINFO ioctl.  "Example" usage can
be found in
lustre-release/lustre/utils/liblustreapi.c::get_lmd_info_fd().

There currently isn't a convenient liblustre API call for it.  It
doesn't poll the OSTs, it just grabs info from the MDT, so it will do
fewer RPCs.

On 4/24/19 12:05 PM, Harms, Kevin wrote:
  Does Lustre provide an optimized stat("filename", ...) that requires fewer RPCs than fd=open("filename", ...); stat(fd); ? If so, are there any descriptions of this optimization?

thanks,
kevin
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--
Nathaniel Clark
Senior Software Engineer
Whamcloud / DDN

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