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NFSD: Add helper to decode OPEN's open_claim4 argument

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Refactor for clarity.

Note that op_fname is the only instance of an NFSv4 filename stored
in a struct xdr_netobj. Convert it to a u32/char * pair so that the
new nfsd4_decode_filename() helper can be used.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2020-11-16 17:45:04 -05:00
parent b07bebd9eb
commit 1708e50b01
3 changed files with 56 additions and 50 deletions
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8
fs/nfsd/nfs4proc.c
View File

@ -257,8 +257,8 @@ do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, stru
* in NFSv4 as in v3 except EXCLUSIVE4_1.
*/
current->fs->umask = open->op_umask;
status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,
open->op_fname.len, &open->op_iattr,
status = do_nfsd_create(rqstp, current_fh, open->op_fname,
open->op_fnamelen, &open->op_iattr,
*resfh, open->op_createmode,
(u32 *)open->op_verf.data,
&open->op_truncate, &open->op_created);
@ -283,7 +283,7 @@ do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, stru
* a chance to an acquire a delegation if appropriate.
*/
status = nfsd_lookup(rqstp, current_fh,
open->op_fname.data, open->op_fname.len, *resfh);
open->op_fname, open->op_fnamelen, *resfh);
if (status)
goto out;
status = nfsd_check_obj_isreg(*resfh);
@ -360,7 +360,7 @@ nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
bool reclaim = false;
dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
(int)open->op_fname.len, open->op_fname.data,
(int)open->op_fnamelen, open->op_fname,
open->op_openowner);
/* This check required by spec. */

95
fs/nfsd/nfs4xdr.c
View File

@ -1072,6 +1072,55 @@ static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
return nfs_ok;
}
static __be32
nfsd4_decode_open_claim4(struct nfsd4_compoundargs *argp,
struct nfsd4_open *open)
{
__be32 status;
if (xdr_stream_decode_u32(argp->xdr, &open->op_claim_type) < 0)
return nfserr_bad_xdr;
switch (open->op_claim_type) {
case NFS4_OPEN_CLAIM_NULL:
case NFS4_OPEN_CLAIM_DELEGATE_PREV:
status = nfsd4_decode_component4(argp, &open->op_fname,
&open->op_fnamelen);
if (status)
return status;
break;
case NFS4_OPEN_CLAIM_PREVIOUS:
if (xdr_stream_decode_u32(argp->xdr, &open->op_delegate_type) < 0)
return nfserr_bad_xdr;
break;
case NFS4_OPEN_CLAIM_DELEGATE_CUR:
status = nfsd4_decode_stateid4(argp, &open->op_delegate_stateid);
if (status)
return status;
status = nfsd4_decode_component4(argp, &open->op_fname,
&open->op_fnamelen);
if (status)
return status;
break;
case NFS4_OPEN_CLAIM_FH:
case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
if (argp->minorversion < 1)
return nfserr_bad_xdr;
/* void */
break;
case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
if (argp->minorversion < 1)
return nfserr_bad_xdr;
status = nfsd4_decode_stateid4(argp, &open->op_delegate_stateid);
if (status)
return status;
break;
default:
return nfserr_bad_xdr;
}
return nfs_ok;
}
static __be32
nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
{
@ -1102,51 +1151,7 @@ nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
status = nfsd4_decode_openflag4(argp, open);
if (status)
return status;
/* open_claim */
READ_BUF(4);
open->op_claim_type = be32_to_cpup(p++);
switch (open->op_claim_type) {
case NFS4_OPEN_CLAIM_NULL:
case NFS4_OPEN_CLAIM_DELEGATE_PREV:
READ_BUF(4);
open->op_fname.len = be32_to_cpup(p++);
READ_BUF(open->op_fname.len);
SAVEMEM(open->op_fname.data, open->op_fname.len);
if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
return status;
break;
case NFS4_OPEN_CLAIM_PREVIOUS:
READ_BUF(4);
open->op_delegate_type = be32_to_cpup(p++);
break;
case NFS4_OPEN_CLAIM_DELEGATE_CUR:
status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
if (status)
return status;
READ_BUF(4);
open->op_fname.len = be32_to_cpup(p++);
READ_BUF(open->op_fname.len);
SAVEMEM(open->op_fname.data, open->op_fname.len);
if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
return status;
break;
case NFS4_OPEN_CLAIM_FH:
case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
if (argp->minorversion < 1)
goto xdr_error;
/* void */
break;
case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
if (argp->minorversion < 1)
goto xdr_error;
status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
if (status)
return status;
break;
default:
goto xdr_error;
}
status = nfsd4_decode_open_claim4(argp, open);
DECODE_TAIL;
}

3
fs/nfsd/xdr4.h
View File

@ -252,7 +252,8 @@ struct nfsd4_listxattrs {
struct nfsd4_open {
u32 op_claim_type; /* request */
struct xdr_netobj op_fname; /* request - everything but CLAIM_PREV */
u32 op_fnamelen;
char * op_fname; /* request - everything but CLAIM_PREV */
u32 op_delegate_type; /* request - CLAIM_PREV only */
stateid_t op_delegate_stateid; /* request - response */
u32 op_why_no_deleg; /* response - DELEG_NONE_EXT only */