On Fri, 1 Aug 2008, jianhua wang wrote:
> we can trace Vnode interface, but can we fetching file system information,
> demonstrate df?
df is a per-filesystem operation - VFS_STATVFS().
As a start, try this DTrace piece:
fbt::fsop_statfs:entry { self->t = arg1 }
fbt::fsop_statfs:return /self->t/
{
arg0 ? printf("statvfs error") : trace((struct statvfs *)(self->t);
self->t = 0;
}
You might need a bit better than 'trace()' - I'm too lazy to write a
prettyprinter now :)
FrankH.
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