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authorJ.Bruce Fields <bfields@fieldses.org>2006-12-13 00:35:25 -0800
committerLinus Torvalds <torvalds@woody.osdl.org>2006-12-13 09:05:54 -0800
commite0bb89ef031f76dcb9c9d920d18b13948f1418da (patch)
tree6016032b160db2cf697eea19cd0f12ace946c7cc /fs
parent021d3a72459191a76e8e482ee4937ba6bc9fd712 (diff)
[PATCH] knfsd: nfsd: don't drop silently on upcall deferral
To avoid tying up server threads when nfsd makes an upcall (to mountd, to get export options, to idmapd, for nfsv4 name<->id mapping, etc.), we temporarily "drop" the request and save enough information so that we can revisit it later. Certain failures during the deferral process can cause us to really drop the request and never revisit it. This is often less than ideal, and is unacceptable in the NFSv4 case--rfc 3530 forbids the server from dropping a request without also closing the connection. As a first step, we modify the deferral code to return -ETIMEDOUT (which is translated to nfserr_jukebox in the v3 and v4 cases, and remains a drop in the v2 case). Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/nfsd/export.c11
-rw-r--r--fs/nfsd/nfsfh.c6
-rw-r--r--fs/nfsd/vfs.c2
3 files changed, 13 insertions, 6 deletions
diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c
index b0591cd172eb..1137d09c5976 100644
--- a/fs/nfsd/export.c
+++ b/fs/nfsd/export.c
@@ -787,15 +787,20 @@ exp_get_by_name(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry,
key.ex_dentry = dentry;
exp = svc_export_lookup(&key);
- if (exp != NULL)
- switch (cache_check(&svc_export_cache, &exp->h, reqp)) {
+ if (exp != NULL) {
+ int err;
+
+ err = cache_check(&svc_export_cache, &exp->h, reqp);
+ switch (err) {
case 0: break;
case -EAGAIN:
- exp = ERR_PTR(-EAGAIN);
+ case -ETIMEDOUT:
+ exp = ERR_PTR(err);
break;
default:
exp = NULL;
}
+ }
return exp;
}
diff --git a/fs/nfsd/nfsfh.c b/fs/nfsd/nfsfh.c
index 727ab3bd450d..b06bf9f70efc 100644
--- a/fs/nfsd/nfsfh.c
+++ b/fs/nfsd/nfsfh.c
@@ -169,9 +169,11 @@ fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, int access)
exp = exp_find(rqstp->rq_client, 0, tfh, &rqstp->rq_chandle);
}
- error = nfserr_dropit;
- if (IS_ERR(exp) && PTR_ERR(exp) == -EAGAIN)
+ if (IS_ERR(exp) && (PTR_ERR(exp) == -EAGAIN
+ || PTR_ERR(exp) == -ETIMEDOUT)) {
+ error = nfserrno(PTR_ERR(exp));
goto out;
+ }
error = nfserr_stale;
if (!exp || IS_ERR(exp))
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 4883d7586229..7a79c23aa6d4 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -99,7 +99,7 @@ static struct raparm_hbucket raparm_hash[RAPARM_HASH_SIZE];
/*
* Called from nfsd_lookup and encode_dirent. Check if we have crossed
* a mount point.
- * Returns -EAGAIN leaving *dpp and *expp unchanged,
+ * Returns -EAGAIN or -ETIMEDOUT leaving *dpp and *expp unchanged,
* or nfs_ok having possibly changed *dpp and *expp
*/
int