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Subject[PATCH 007 of 8] knfsd: nfsd4: xdr encoding for fs_locations

From: J.Bruce Fields <bfields@fieldses.org>

Encode fs_locations attribute.

Signed-off-by: Manoj Naik <manoj@almaden.ibm.com>
Signed-off-by: Fred Isaman <iisaman@citi.umich.edu>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Neil Brown <neilb@suse.de>

### Diffstat output
./fs/nfsd/nfs4xdr.c | 125 ++++++++++++++++++++++++++++++++++++++++++++
./include/linux/nfsd/nfsd.h | 3 -
2 files changed, 126 insertions(+), 2 deletions(-)
diff .prev/fs/nfsd/nfs4xdr.c ./fs/nfsd/nfs4xdr.c
--- .prev/fs/nfsd/nfs4xdr.c 2006-09-29 12:57:28.000000000 +1000
+++ ./fs/nfsd/nfs4xdr.c 2006-09-29 13:04:07.000000000 +1000
@@ -1224,6 +1224,119 @@ nfsd4_decode_compound(struct nfsd4_compo
stateowner->so_replay.rp_buflen); \
} } while (0);

+/* Encode as an array of strings the string given with components
+ * seperated @sep.
+ */
+static int nfsd4_encode_components(char sep, char *components,
+ u32 **pp, int *buflen)
+{
+ u32 *p = *pp;
+ u32 *countp = p;
+ int strlen, count=0;
+ char *str, *end;
+
+ dprintk("nfsd4_encode_components(%s)\n", components);
+ if ((*buflen -= 4) < 0)
+ return nfserr_resource;
+ WRITE32(0); /* We will fill this in with @count later */
+ end = str = components;
+ while (*end) {
+ for (; *end && (*end != sep); end++)
+ ; /* Point to end of component */
+ strlen = end - str;
+ if (strlen) {
+ if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
+ return nfserr_resource;
+ WRITE32(strlen);
+ WRITEMEM(str, strlen);
+ count++;
+ }
+ else
+ end++;
+ str = end;
+ }
+ *pp = p;
+ p = countp;
+ WRITE32(count);
+ return 0;
+}
+
+/*
+ * encode a location element of a fs_locations structure
+ */
+static int nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
+ u32 **pp, int *buflen)
+{
+ int status;
+ u32 *p = *pp;
+
+ status = nfsd4_encode_components(':', location->hosts, &p, buflen);
+ if (status)
+ return status;
+ status = nfsd4_encode_components('/', location->path, &p, buflen);
+ if (status)
+ return status;
+ *pp = p;
+ return 0;
+}
+
+/*
+ * Return the path to an export point in the pseudo filesystem namespace
+ * Returned string is safe to use as long as the caller holds a reference
+ * to @exp.
+ */
+static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp)
+{
+ struct svc_fh tmp_fh;
+ char *path, *rootpath;
+ int stat;
+
+ fh_init(&tmp_fh, NFS4_FHSIZE);
+ stat = exp_pseudoroot(rqstp->rq_client, &tmp_fh, &rqstp->rq_chandle);
+ if (stat)
+ return ERR_PTR(stat);
+ rootpath = tmp_fh.fh_export->ex_path;
+
+ path = exp->ex_path;
+
+ if (strncmp(path, rootpath, strlen(rootpath))) {
+ printk("nfsd: fs_locations failed;"
+ "%s is not contained in %s\n", path, rootpath);
+ return ERR_PTR(-EOPNOTSUPP);
+ }
+
+ return path + strlen(rootpath);
+}
+
+/*
+ * encode a fs_locations structure
+ */
+static int nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
+ struct svc_export *exp,
+ u32 **pp, int *buflen)
+{
+ int status, i;
+ u32 *p = *pp;
+ struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
+ char *root = nfsd4_path(rqstp, exp);
+
+ if (IS_ERR(root))
+ return PTR_ERR(root);
+ status = nfsd4_encode_components('/', root, &p, buflen);
+ if (status)
+ return status;
+ if ((*buflen -= 4) < 0)
+ return nfserr_resource;
+ WRITE32(fslocs->locations_count);
+ for (i=0; i<fslocs->locations_count; i++) {
+ status = nfsd4_encode_fs_location4(&fslocs->locations[i],
+ &p, buflen);
+ if (status)
+ return status;
+ }
+ *pp = p;
+ return 0;
+}

static u32 nfs4_ftypes[16] = {
NF4BAD, NF4FIFO, NF4CHR, NF4BAD,
@@ -1335,6 +1448,11 @@ nfsd4_encode_fattr(struct svc_fh *fhp, s
goto out_nfserr;
}
}
+ if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
+ if (exp->ex_fslocs.locations == NULL) {
+ bmval0 &= ~FATTR4_WORD0_FS_LOCATIONS;
+ }
+ }
if ((buflen -= 16) < 0)
goto out_resource;

@@ -1514,6 +1632,13 @@ out_acl:
goto out_resource;
WRITE64((u64) statfs.f_files);
}
+ if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
+ status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
+ if (status == nfserr_resource)
+ goto out_resource;
+ if (status)
+ goto out;
+ }
if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
if ((buflen -= 4) < 0)
goto out_resource;
diff .prev/include/linux/nfsd/nfsd.h ./include/linux/nfsd/nfsd.h
--- .prev/include/linux/nfsd/nfsd.h 2006-09-29 12:57:28.000000000 +1000
+++ ./include/linux/nfsd/nfsd.h 2006-09-29 13:04:07.000000000 +1000
@@ -292,7 +292,6 @@ static inline int is_fsid(struct svc_fh
/*
* The following attributes are currently not supported by the NFSv4 server:
* ARCHIVE (deprecated anyway)
- * FS_LOCATIONS (will be supported eventually)
* HIDDEN (unlikely to be supported any time soon)
* MIMETYPE (unlikely to be supported any time soon)
* QUOTA_* (will be supported in a forthcoming patch)
@@ -308,7 +307,7 @@ static inline int is_fsid(struct svc_fh
| FATTR4_WORD0_ACLSUPPORT | FATTR4_WORD0_CANSETTIME | FATTR4_WORD0_CASE_INSENSITIVE \
| FATTR4_WORD0_CASE_PRESERVING | FATTR4_WORD0_CHOWN_RESTRICTED \
| FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FILEID | FATTR4_WORD0_FILES_AVAIL \
- | FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_HOMOGENEOUS \
+ | FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_HOMOGENEOUS \
| FATTR4_WORD0_MAXFILESIZE | FATTR4_WORD0_MAXLINK | FATTR4_WORD0_MAXNAME \
| FATTR4_WORD0_MAXREAD | FATTR4_WORD0_MAXWRITE | FATTR4_WORD0_ACL)

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