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Fix the pNFS server for a case where mirror level equals number of DSs.

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If a pNFS service was set up where the number of DSs equals the mirror level
and then a DS was disabled, the service would create files with duplicate
entries for the same DS. This bug occurred because I didn't realize that
TAILQ_FOREACH_FROM() would start at the beginning of the list when the
inital value of the variable was NULL.
This patch also changes the pNFS server DS file creation code so that it
creates entrie(s) with 0.0.0.0 IP address when it cannot create mirror level
files due to lack of DSs.
The patch only affects the pNFS service and only when it was created with
a number of DSs equal to the mirror level and mirroring is enabled.
This commit is contained in:
Rick Macklem 2018-06-29 12:41:36 +00:00
parent a08232301d
commit 1aabf3fd5e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=335794
1 changed files with 21 additions and 4 deletions
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25
sys/fs/nfsserver/nfs_nfsdport.c
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@ -3859,8 +3859,8 @@ nfsrv_pnfscreate(struct vnode *vp, struct vattr *vap, struct ucred *cred,
i = dsdir[0] = ds->nfsdev_nextdir;
ds->nfsdev_nextdir = (ds->nfsdev_nextdir + 1) % nfsrv_dsdirsize;
dvp[0] = ds->nfsdev_dsdir[i];
if (nfsrv_maxpnfsmirror > 1) {
mds = TAILQ_NEXT(ds, nfsdev_list);
mds = TAILQ_NEXT(ds, nfsdev_list);
if (nfsrv_maxpnfsmirror > 1 && mds != NULL) {
TAILQ_FOREACH_FROM(mds, &nfsrv_devidhead, nfsdev_list) {
if (mds->nfsdev_nmp != NULL) {
dsdir[mirrorcnt] = i;
@ -3879,7 +3879,8 @@ nfsrv_pnfscreate(struct vnode *vp, struct vattr *vap, struct ucred *cred,
if (mirrorcnt > 1)
tdsc = dsc = malloc(sizeof(*dsc) * (mirrorcnt - 1), M_TEMP,
M_WAITOK | M_ZERO);
tpf = pf = malloc(sizeof(*pf) * mirrorcnt, M_TEMP, M_WAITOK | M_ZERO);
tpf = pf = malloc(sizeof(*pf) * nfsrv_maxpnfsmirror, M_TEMP, M_WAITOK |
M_ZERO);
error = nfsvno_getfh(vp, &fh, p);
if (error == 0)
@ -3987,11 +3988,27 @@ nfsrv_pnfscreate(struct vnode *vp, struct vattr *vap, struct ucred *cred,
NFSFREECRED(tcred);
if (error == 0) {
ASSERT_VOP_ELOCKED(vp, "nfsrv_pnfscreate vp");
NFSD_DEBUG(4, "nfsrv_pnfscreate: mirrorcnt=%d maxmirror=%d\n",
mirrorcnt, nfsrv_maxpnfsmirror);
/*
* For all mirrors that couldn't be created, fill in the
* *pf structure, but with an IP address == 0.0.0.0.
*/
tpf = pf + mirrorcnt;
for (i = mirrorcnt; i < nfsrv_maxpnfsmirror; i++, tpf++) {
*tpf = *pf;
tpf->dsf_sin.sin_family = AF_INET;
tpf->dsf_sin.sin_len = sizeof(struct sockaddr_in);
tpf->dsf_sin.sin_addr.s_addr = 0;
tpf->dsf_sin.sin_port = 0;
}
error = vn_start_write(vp, &mp, V_WAIT);
if (error == 0) {
error = vn_extattr_set(vp, IO_NODELOCKED,
EXTATTR_NAMESPACE_SYSTEM, "pnfsd.dsfile",
sizeof(*pf) * mirrorcnt, (char *)pf, p);
sizeof(*pf) * nfsrv_maxpnfsmirror, (char *)pf, p);
if (error == 0)
error = vn_extattr_set(vp, IO_NODELOCKED,
EXTATTR_NAMESPACE_SYSTEM, "pnfsd.dsattr",