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NFSv4: Implement the fs_locations function call

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NFSv4 allows for the fact that filesystems may be replicated across
several servers or that they may be migrated to a backup server in case of
failure of the primary server.
fs_locations is an NFSv4 operation for retrieving information about the
location of migrated and/or replicated filesystems.

Based on an initial implementation by Jiaying Zhang <jiayingz@citi.umich.edu>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust
2006-06-09 09:34:22 -04:00
parent 8b23ea7bed
commit 683b57b435
5 changed files with 166 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

112
fs/nfs/nfs4xdr.c
View File

@@ -411,6 +411,15 @@ static int nfs_stat_to_errno(int);
#define NFS4_dec_setacl_sz (compound_decode_hdr_maxsz + \
decode_putfh_maxsz + \
op_decode_hdr_maxsz + nfs4_fattr_bitmap_maxsz)
#define NFS4_enc_fs_locations_sz \
(compound_encode_hdr_maxsz + \
encode_putfh_maxsz + \
encode_getattr_maxsz)
#define NFS4_dec_fs_locations_sz \
(compound_decode_hdr_maxsz + \
decode_putfh_maxsz + \
op_decode_hdr_maxsz + \
nfs4_fattr_bitmap_maxsz)
static struct {
unsigned int mode;
@@ -2002,6 +2011,38 @@ out:
return status;
}
/*
* Encode FS_LOCATIONS request
*/
static int nfs4_xdr_enc_fs_locations(struct rpc_rqst *req, uint32_t *p, struct nfs4_fs_locations_arg *args)
{
struct xdr_stream xdr;
struct compound_hdr hdr = {
.nops = 3,
};
struct rpc_auth *auth = req->rq_task->tk_auth;
int replen;
int status;
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
encode_compound_hdr(&xdr, &hdr);
if ((status = encode_putfh(&xdr, args->dir_fh)) != 0)
goto out;
if ((status = encode_lookup(&xdr, args->name)) != 0)
goto out;
if ((status = encode_getfattr(&xdr, args->bitmask)) != 0)
goto out;
/* set up reply
* toplevel_status + taglen + rescount + OP_PUTFH + status
* + OP_LOOKUP + status + OP_GETATTR + status = 7
*/
replen = (RPC_REPHDRSIZE + auth->au_rslack + 7) << 2;
xdr_inline_pages(&req->rq_rcv_buf, replen, &args->page,
0, PAGE_SIZE);
out:
return status;
}
/*
* START OF "GENERIC" DECODE ROUTINES.
* These may look a little ugly since they are imported from a "generic"
@@ -2036,7 +2077,7 @@ out:
} \
} while (0)
static int decode_opaque_inline(struct xdr_stream *xdr, uint32_t *len, char **string)
static int decode_opaque_inline(struct xdr_stream *xdr, unsigned int *len, char **string)
{
uint32_t *p;
@@ -2087,7 +2128,7 @@ static int decode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected)
static int decode_ace(struct xdr_stream *xdr, void *ace, struct nfs4_client *clp)
{
uint32_t *p;
uint32_t strlen;
unsigned int strlen;
char *str;
READ_BUF(12);
@@ -2336,6 +2377,45 @@ static int decode_attr_files_total(struct xdr_stream *xdr, uint32_t *bitmap, uin
return status;
}
static int decode_attr_fs_locations(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs_fs_locations *res)
{
int n;
uint32_t *p;
int status = -EIO;
if (unlikely(bitmap[0] & (FATTR4_WORD0_FS_LOCATIONS -1U)))
goto out;
status = 0;
if (unlikely(!(bitmap[0] & FATTR4_WORD0_FS_LOCATIONS)))
goto out;
status = decode_opaque_inline(xdr, &res->fs_pathlen, &res->fs_path);
if (unlikely(status != 0))
goto out;
READ_BUF(4);
READ32(n);
if (n <= 0)
goto out_eio;
res->nlocations = 0;
while (res->nlocations < n) {
struct nfs_fs_location *loc = &res->locations[res->nlocations];
status = decode_opaque_inline(xdr, &loc->serverlen, &loc->server);
if (unlikely(status != 0))
goto out_eio;
status = decode_opaque_inline(xdr, &loc->rootpathlen, &loc->rootpath);
if (unlikely(status != 0))
goto out_eio;
if (res->nlocations < NFS_FS_LOCATIONS_MAXENTRIES)
res->nlocations++;
}
out:
dprintk("%s: fs_locations done, error = %d\n", __FUNCTION__, status);
return status;
out_eio:
status = -EIO;
goto out;
}
static int decode_attr_maxfilesize(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
{
uint32_t *p;
@@ -2867,6 +2947,10 @@ static int decode_getfattr(struct xdr_stream *xdr, struct nfs_fattr *fattr, cons
goto xdr_error;
if ((status = decode_attr_fileid(xdr, bitmap, &fattr->fileid)) != 0)
goto xdr_error;
if ((status = decode_attr_fs_locations(xdr, bitmap, container_of(fattr,
struct nfs_fs_locations,
fattr))) != 0)
goto xdr_error;
if ((status = decode_attr_mode(xdr, bitmap, &fattr->mode)) != 0)
goto xdr_error;
fattr->mode |= fmode;
@@ -4210,6 +4294,29 @@ out:
return status;
}
/*
* FS_LOCATIONS request
*/
static int nfs4_xdr_dec_fs_locations(struct rpc_rqst *req, uint32_t *p, struct nfs_fs_locations *res)
{
struct xdr_stream xdr;
struct compound_hdr hdr;
int status;
xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
status = decode_compound_hdr(&xdr, &hdr);
if (status != 0)
goto out;
if ((status = decode_putfh(&xdr)) != 0)
goto out;
if ((status = decode_lookup(&xdr)) != 0)
goto out;
xdr_enter_page(&xdr, PAGE_SIZE);
status = decode_getfattr(&xdr, &res->fattr, res->server);
out:
return status;
}
uint32_t *nfs4_decode_dirent(uint32_t *p, struct nfs_entry *entry, int plus)
{
uint32_t bitmap[2] = {0};
@@ -4381,6 +4488,7 @@ struct rpc_procinfo nfs4_procedures[] = {
PROC(DELEGRETURN, enc_delegreturn, dec_delegreturn),
PROC(GETACL, enc_getacl, dec_getacl),
PROC(SETACL, enc_setacl, dec_setacl),
PROC(FS_LOCATIONS, enc_fs_locations, dec_fs_locations),
};
struct rpc_version nfs_version4 = {