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A previous change moved the GETATTR RPC for open() calls that hit in the

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name cache up into nfs_lookup() instead of nfs_open().  Continue this
trend by flushing the attribute cache for leaf nodes in nfs_lookup() during
an open() if we do a LOOKUP RPC.  For NFSv3 this should generally be a NOP
as the attributes are flushed before fetching the post-op attributes from
the LOOKUP RPC which most (all?) NFSv3 servers provide, so the post-op
attributes should populate the cache.

Now all NFS open() calls will always clear the cached attributes during the
nfs_lookup() prior to nfs_open() in the !NMODIFIED case to provide CTOC.
As a result, we can remove the conditional flushing of the attribute
cache from nfs_open().

Reviewed by:	rmacklem, bde
MFC after:	2 weeks
This commit is contained in:
John Baldwin 2010-07-12 14:27:49 +00:00
parent 985fda3dfe
commit 72ccfc240b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=209948
1 changed files with 14 additions and 9 deletions
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23
sys/nfsclient/nfs_vnops.c
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@ -538,15 +538,6 @@ nfs_open(struct vop_open_args *ap)
np->n_mtime = vattr.va_mtime;
mtx_unlock(&np->n_mtx);
} else {
struct thread *td = curthread;
if (np->n_ac_ts_syscalls != td->td_syscalls ||
np->n_ac_ts_tid != td->td_tid ||
td->td_proc == NULL ||
np->n_ac_ts_pid != td->td_proc->p_pid) {
np->n_attrstamp = 0;
KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
}
mtx_unlock(&np->n_mtx);
error = VOP_GETATTR(vp, &vattr, ap->a_cred);
if (error)
@ -1123,6 +1114,20 @@ nfs_lookup(struct vop_lookup_args *ap)
return (error);
}
newvp = NFSTOV(np);
/*
* Flush the attribute cache when opening a leaf node
* to ensure that fresh attributes are fetched in
* nfs_open() if we are unable to fetch attributes
* from the LOOKUP reply.
*/
if ((flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) &&
!(np->n_flag & NMODIFIED)) {
mtx_lock(&np->n_mtx);
np->n_attrstamp = 0;
KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp);
mtx_unlock(&np->n_mtx);
}
}
if (v3) {
nfsm_postop_attr(newvp, attrflag);