From: J. Bruce Fields Date: Tue, 18 Oct 2016 18:18:40 +0000 (-0400) Subject: nfsd: clean up supported attribute handling X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=916d2d844afd;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git nfsd: clean up supported attribute handling Minor cleanup, no change in behavior. Provide helpers for some common attribute bitmap operations. Drop some comments that just echo the code. Signed-off-by: J. Bruce Fields --- diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c index abb09b580389..e901cf124e9f 100644 --- a/fs/nfsd/nfs4proc.c +++ b/fs/nfsd/nfs4proc.c @@ -96,33 +96,12 @@ check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, { struct dentry *dentry = cstate->current_fh.fh_dentry; - /* - * Check about attributes are supported by the NFSv4 server or not. - * According to spec, unsupported attributes return ERR_ATTRNOTSUPP. - */ - if ((bmval[0] & ~nfsd_suppattrs0(cstate->minorversion)) || - (bmval[1] & ~nfsd_suppattrs1(cstate->minorversion)) || - (bmval[2] & ~nfsd_suppattrs2(cstate->minorversion))) + if (!nfsd_attrs_supported(cstate->minorversion, bmval)) return nfserr_attrnotsupp; - - /* - * Check FATTR4_WORD0_ACL can be supported - * in current environment or not. - */ - if (bmval[0] & FATTR4_WORD0_ACL) { - if (!IS_POSIXACL(d_inode(dentry))) - return nfserr_attrnotsupp; - } - - /* - * According to spec, read-only attributes return ERR_INVAL. - */ - if (writable) { - if ((bmval[0] & ~writable[0]) || (bmval[1] & ~writable[1]) || - (bmval[2] & ~writable[2])) - return nfserr_inval; - } - + if ((bmval[0] & FATTR4_WORD0_ACL) && !IS_POSIXACL(d_inode(dentry))) + return nfserr_attrnotsupp; + if (writable && !bmval_is_subset(bmval, writable)) + return nfserr_inval; return nfs_ok; } @@ -695,9 +674,9 @@ nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1) return nfserr_inval; - getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion); - getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion); - getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion); + getattr->ga_bmval[0] &= nfsd_suppattrs[cstate->minorversion][0]; + getattr->ga_bmval[1] &= nfsd_suppattrs[cstate->minorversion][1]; + getattr->ga_bmval[2] &= nfsd_suppattrs[cstate->minorversion][2]; getattr->ga_fhp = &cstate->current_fh; return nfs_ok; @@ -799,9 +778,9 @@ nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1) return nfserr_inval; - readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion); - readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion); - readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion); + readdir->rd_bmval[0] &= nfsd_suppattrs[cstate->minorversion][0]; + readdir->rd_bmval[1] &= nfsd_suppattrs[cstate->minorversion][1]; + readdir->rd_bmval[2] &= nfsd_suppattrs[cstate->minorversion][2]; if ((cookie == 1) || (cookie == 2) || (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE))) diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c index c2d2895a1ec1..a99bbb88c6e1 100644 --- a/fs/nfsd/nfs4xdr.c +++ b/fs/nfsd/nfs4xdr.c @@ -57,6 +57,20 @@ #define NFSDDBG_FACILITY NFSDDBG_XDR +u32 nfsd_suppattrs[3][3] = { + {NFSD4_SUPPORTED_ATTRS_WORD0, + NFSD4_SUPPORTED_ATTRS_WORD1, + NFSD4_SUPPORTED_ATTRS_WORD2}, + + {NFSD4_1_SUPPORTED_ATTRS_WORD0, + NFSD4_1_SUPPORTED_ATTRS_WORD1, + NFSD4_1_SUPPORTED_ATTRS_WORD2}, + + {NFSD4_1_SUPPORTED_ATTRS_WORD0, + NFSD4_1_SUPPORTED_ATTRS_WORD1, + NFSD4_2_SUPPORTED_ATTRS_WORD2}, +}; + /* * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing * directory in order to indicate to the client that a filesystem boundary is present @@ -2340,9 +2354,7 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp, struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1); - BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion)); - BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion)); - BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion)); + BUG_ON(!nfsd_attrs_supported(minorversion, bmval)); if (exp->ex_fslocs.migrated) { status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err); @@ -2409,29 +2421,27 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp, p++; /* to be backfilled later */ if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) { - u32 word0 = nfsd_suppattrs0(minorversion); - u32 word1 = nfsd_suppattrs1(minorversion); - u32 word2 = nfsd_suppattrs2(minorversion); + u32 *supp = nfsd_suppattrs[minorversion]; if (!IS_POSIXACL(dentry->d_inode)) - word0 &= ~FATTR4_WORD0_ACL; + supp[0] &= ~FATTR4_WORD0_ACL; if (!contextsupport) - word2 &= ~FATTR4_WORD2_SECURITY_LABEL; - if (!word2) { + supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL; + if (!supp[2]) { p = xdr_reserve_space(xdr, 12); if (!p) goto out_resource; *p++ = cpu_to_be32(2); - *p++ = cpu_to_be32(word0); - *p++ = cpu_to_be32(word1); + *p++ = cpu_to_be32(supp[0]); + *p++ = cpu_to_be32(supp[1]); } else { p = xdr_reserve_space(xdr, 16); if (!p) goto out_resource; *p++ = cpu_to_be32(3); - *p++ = cpu_to_be32(word0); - *p++ = cpu_to_be32(word1); - *p++ = cpu_to_be32(word2); + *p++ = cpu_to_be32(supp[0]); + *p++ = cpu_to_be32(supp[1]); + *p++ = cpu_to_be32(supp[2]); } } if (bmval0 & FATTR4_WORD0_TYPE) { diff --git a/fs/nfsd/nfsd.h b/fs/nfsd/nfsd.h index 9446849888d5..a72d4163273a 100644 --- a/fs/nfsd/nfsd.h +++ b/fs/nfsd/nfsd.h @@ -361,25 +361,18 @@ void nfsd_lockd_shutdown(void); (NFSD4_1_SUPPORTED_ATTRS_WORD2 | \ NFSD4_2_SECURITY_ATTRS) -static inline u32 nfsd_suppattrs0(u32 minorversion) -{ - return minorversion ? NFSD4_1_SUPPORTED_ATTRS_WORD0 - : NFSD4_SUPPORTED_ATTRS_WORD0; -} +extern u32 nfsd_suppattrs[3][3]; -static inline u32 nfsd_suppattrs1(u32 minorversion) +static inline bool bmval_is_subset(u32 *bm1, u32 *bm2) { - return minorversion ? NFSD4_1_SUPPORTED_ATTRS_WORD1 - : NFSD4_SUPPORTED_ATTRS_WORD1; + return !((bm1[0] & ~bm2[0]) || + (bm1[1] & ~bm2[1]) || + (bm1[2] & ~bm2[2])); } -static inline u32 nfsd_suppattrs2(u32 minorversion) +static inline bool nfsd_attrs_supported(u32 minorversion, u32 *bmval) { - switch (minorversion) { - default: return NFSD4_2_SUPPORTED_ATTRS_WORD2; - case 1: return NFSD4_1_SUPPORTED_ATTRS_WORD2; - case 0: return NFSD4_SUPPORTED_ATTRS_WORD2; - } + return bmval_is_subset(bmval, nfsd_suppattrs[minorversion]); } /* These will return ERR_INVAL if specified in GETATTR or READDIR. */