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Add an optional feature to the pNFS server.

Browse Source 
Without this patch, the pNFS server distributes the data storage files across
all of the specified DSs.
A tester noted that it would be nice if a system administrator could control
which DSs are used to store the file data for a given exported MDS file system.
This patch adds an optional suffix for each entry in the "-p" option argument
that specifies "store file data for this MDS file system" in this DS.
The patch should only affect sites using the pNFS server (specified via the
"-p" command line option for nfsd.
The interface between the nfsd and the kernel has changed with this patch,
so anyone using the "-p" option needs to rebuild their nfsd from sources
with this patch applied to them.

Discussed with:	james.rose@framestore.com
This commit is contained in:
Rick Macklem 2018-07-02 19:26:31 +00:00
parent 2f32675c83
commit ed46427268
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=335871
1 changed files with 35 additions and 1 deletions
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36
usr.sbin/nfsd/nfsd.c
View File

@ -1180,9 +1180,11 @@ static void
parse_dsserver(const char *optionarg, struct nfsd_nfsd_args *nfsdargp)
{
char *ad, *cp, *cp2, *dsaddr, *dshost, *dspath, *dsvol, nfsprt[9];
char *mdspath, *mdsp;
int ecode;
u_int adsiz, dsaddrcnt, dshostcnt, dspathcnt, hostsiz, pathsiz;
size_t dsaddrsiz, dshostsiz, dspathsiz, nfsprtsiz;
u_int mdspathcnt;
size_t dsaddrsiz, dshostsiz, dspathsiz, nfsprtsiz, mdspathsiz;
struct addrinfo hints, *ai_tcp;
struct sockaddr_in sin;
@ -1206,6 +1208,11 @@ parse_dsserver(const char *optionarg, struct nfsd_nfsd_args *nfsdargp)
dsaddr = malloc(dsaddrsiz);
if (dsaddr == NULL)
errx(1, "Out of memory");
mdspathsiz = 1024;
mdspathcnt = 0;
mdspath = malloc(mdspathsiz);
if (mdspath == NULL)
errx(1, "Out of memory");
/* Put the NFS port# in "." form. */
snprintf(nfsprt, 9, ".%d.%d", 2049 >> 8, 2049 & 0xff);
@ -1227,6 +1234,14 @@ parse_dsserver(const char *optionarg, struct nfsd_nfsd_args *nfsdargp)
usage();
*dsvol++ = '\0';
/* Optional path for MDS file system to be stored on DS. */
mdsp = strchr(dsvol, '#');
if (mdsp != NULL) {
if (*(mdsp + 1) == '\0' || mdsp <= dsvol)
usage();
*mdsp++ = '\0';
}
/* Append this pathname to dspath. */
pathsiz = strlen(dsvol);
if (dspathcnt + pathsiz + 1 > dspathsiz) {
@ -1238,6 +1253,23 @@ parse_dsserver(const char *optionarg, struct nfsd_nfsd_args *nfsdargp)
strcpy(&dspath[dspathcnt], dsvol);
dspathcnt += pathsiz + 1;
/* Append this pathname to mdspath. */
if (mdsp != NULL)
pathsiz = strlen(mdsp);
else
pathsiz = 0;
if (mdspathcnt + pathsiz + 1 > mdspathsiz) {
mdspathsiz *= 2;
mdspath = realloc(mdspath, mdspathsiz);
if (mdspath == NULL)
errx(1, "Out of memory");
}
if (mdsp != NULL)
strcpy(&mdspath[mdspathcnt], mdsp);
else
mdspath[mdspathcnt] = '\0';
mdspathcnt += pathsiz + 1;
if (ai_tcp != NULL)
freeaddrinfo(ai_tcp);
@ -1290,6 +1322,8 @@ parse_dsserver(const char *optionarg, struct nfsd_nfsd_args *nfsdargp)
nfsdargp->dnshostlen = dshostcnt;
nfsdargp->dspath = dspath;
nfsdargp->dspathlen = dspathcnt;
nfsdargp->mdspath = mdspath;
nfsdargp->mdspathlen = mdspathcnt;
freeaddrinfo(ai_tcp);
}