This patch makes the afs_getattr() function return the current
attributes in the vnode if the ATTR_HINT flag is passed (Solaris
only), rather than making sure it's exactly correct by fetching
the status over the network.
Currently, if a user-space process reads /proc/NNN/status, the
kernel ends up calling rm_assize() to find the size of that proc's
address space, which calls getattr with ATTR_HINT. Blocking here
in RX network wait, especially if the calling user doesn't have
tokens to do FetchStatus on the relevant files, is bad.
-- kolya
Index: VNOPS/afs_vnop_attrs.c
===================================================================
RCS file: /cvs/openafs/src/afs/VNOPS/afs_vnop_attrs.c,v
retrieving revision 1.2
diff -c -r1.2 afs_vnop_attrs.c
*** VNOPS/afs_vnop_attrs.c 2000/11/04 10:03:30 1.2
--- VNOPS/afs_vnop_attrs.c 2000/12/05 23:27:29
***************
*** 188,193 ****
--- 188,200 ----
afs_Trace2(afs_iclSetp, CM_TRACE_GETATTR, ICL_TYPE_POINTER, avc,
ICL_TYPE_INT32, avc->m.Length);
+ #if defined(AFS_SUN5_ENV)
+ if (flags & ATTR_HINT) {
+ code = afs_CopyOutAttrs(avc, attrs);
+ return code;
+ }
+ #endif
+
#if defined(AFS_SUN_ENV) || defined(AFS_ALPHA_ENV) || defined(AFS_SUN5_ENV)
afs_BozonLock(&avc->pvnLock, avc);
#endif
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