From: Trond Myklebust Date: Sat, 6 May 2017 16:19:11 +0000 (-0400) Subject: NFSv4: Fix exclusive create attributes encoding X-Git-Tag: v4.12-rc1~32^2~3 X-Git-Url: https://git.kernelconcepts.de/?p=karo-tx-linux.git;a=commitdiff_plain;h=28cf22d0ba283deccc30b71de5f34d222cf9aa4c NFSv4: Fix exclusive create attributes encoding When using NFS4_CREATE_EXCLUSIVE4_1 mode, the client will overestimate the amount of space that it needs for the attributes because it does so before checking whether or not the server supports a given attribute. Fix by checking the attribute mask earlier. Signed-off-by: Trond Myklebust --- diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c index dbfe48ac3529..3aebfdc82b30 100644 --- a/fs/nfs/nfs4xdr.c +++ b/fs/nfs/nfs4xdr.c @@ -1000,8 +1000,9 @@ static void encode_nfs4_verifier(struct xdr_stream *xdr, const nfs4_verifier *ve static void encode_attrs(struct xdr_stream *xdr, const struct iattr *iap, const struct nfs4_label *label, + const umode_t *umask, const struct nfs_server *server, - bool excl_check, const umode_t *umask) + const uint32_t attrmask[]) { char owner_name[IDMAP_NAMESZ]; char owner_group[IDMAP_NAMESZ]; @@ -1016,22 +1017,20 @@ static void encode_attrs(struct xdr_stream *xdr, const struct iattr *iap, /* * We reserve enough space to write the entire attribute buffer at once. */ - if (iap->ia_valid & ATTR_SIZE) { + if ((iap->ia_valid & ATTR_SIZE) && (attrmask[0] & FATTR4_WORD0_SIZE)) { bmval[0] |= FATTR4_WORD0_SIZE; len += 8; } - if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) - umask = NULL; if (iap->ia_valid & ATTR_MODE) { - if (umask) { + if (umask && (attrmask[2] & FATTR4_WORD2_MODE_UMASK)) { bmval[2] |= FATTR4_WORD2_MODE_UMASK; len += 8; - } else { + } else if (attrmask[1] & FATTR4_WORD1_MODE) { bmval[1] |= FATTR4_WORD1_MODE; len += 4; } } - if (iap->ia_valid & ATTR_UID) { + if ((iap->ia_valid & ATTR_UID) && (attrmask[1] & FATTR4_WORD1_OWNER)) { owner_namelen = nfs_map_uid_to_name(server, iap->ia_uid, owner_name, IDMAP_NAMESZ); if (owner_namelen < 0) { dprintk("nfs: couldn't resolve uid %d to string\n", @@ -1044,7 +1043,8 @@ static void encode_attrs(struct xdr_stream *xdr, const struct iattr *iap, bmval[1] |= FATTR4_WORD1_OWNER; len += 4 + (XDR_QUADLEN(owner_namelen) << 2); } - if (iap->ia_valid & ATTR_GID) { + if ((iap->ia_valid & ATTR_GID) && + (attrmask[1] & FATTR4_WORD1_OWNER_GROUP)) { owner_grouplen = nfs_map_gid_to_group(server, iap->ia_gid, owner_group, IDMAP_NAMESZ); if (owner_grouplen < 0) { dprintk("nfs: couldn't resolve gid %d to string\n", @@ -1056,32 +1056,26 @@ static void encode_attrs(struct xdr_stream *xdr, const struct iattr *iap, bmval[1] |= FATTR4_WORD1_OWNER_GROUP; len += 4 + (XDR_QUADLEN(owner_grouplen) << 2); } - if (iap->ia_valid & ATTR_ATIME_SET) { - bmval[1] |= FATTR4_WORD1_TIME_ACCESS_SET; - len += 16; - } else if (iap->ia_valid & ATTR_ATIME) { - bmval[1] |= FATTR4_WORD1_TIME_ACCESS_SET; - len += 4; - } - if (iap->ia_valid & ATTR_MTIME_SET) { - bmval[1] |= FATTR4_WORD1_TIME_MODIFY_SET; - len += 16; - } else if (iap->ia_valid & ATTR_MTIME) { - bmval[1] |= FATTR4_WORD1_TIME_MODIFY_SET; - len += 4; + if (attrmask[1] & FATTR4_WORD1_TIME_ACCESS_SET) { + if (iap->ia_valid & ATTR_ATIME_SET) { + bmval[1] |= FATTR4_WORD1_TIME_ACCESS_SET; + len += 16; + } else if (iap->ia_valid & ATTR_ATIME) { + bmval[1] |= FATTR4_WORD1_TIME_ACCESS_SET; + len += 4; + } } - - if (excl_check) { - const u32 *excl_bmval = server->exclcreat_bitmask; - bmval[0] &= excl_bmval[0]; - bmval[1] &= excl_bmval[1]; - bmval[2] &= excl_bmval[2]; - - if (!(excl_bmval[2] & FATTR4_WORD2_SECURITY_LABEL)) - label = NULL; + if (attrmask[1] & FATTR4_WORD1_TIME_MODIFY_SET) { + if (iap->ia_valid & ATTR_MTIME_SET) { + bmval[1] |= FATTR4_WORD1_TIME_MODIFY_SET; + len += 16; + } else if (iap->ia_valid & ATTR_MTIME) { + bmval[1] |= FATTR4_WORD1_TIME_MODIFY_SET; + len += 4; + } } - if (label) { + if (label && (attrmask[2] & FATTR4_WORD2_SECURITY_LABEL)) { len += 4 + 4 + 4 + (XDR_QUADLEN(label->len) << 2); bmval[2] |= FATTR4_WORD2_SECURITY_LABEL; } @@ -1188,8 +1182,8 @@ static void encode_create(struct xdr_stream *xdr, const struct nfs4_create_arg * } encode_string(xdr, create->name->len, create->name->name); - encode_attrs(xdr, create->attrs, create->label, create->server, false, - &create->umask); + encode_attrs(xdr, create->attrs, create->label, &create->umask, + create->server, create->server->attr_bitmask); } static void encode_getattr_one(struct xdr_stream *xdr, uint32_t bitmap, struct compound_hdr *hdr) @@ -1409,13 +1403,13 @@ static inline void encode_createmode(struct xdr_stream *xdr, const struct nfs_op switch(arg->createmode) { case NFS4_CREATE_UNCHECKED: *p = cpu_to_be32(NFS4_CREATE_UNCHECKED); - encode_attrs(xdr, arg->u.attrs, arg->label, arg->server, false, - &arg->umask); + encode_attrs(xdr, arg->u.attrs, arg->label, &arg->umask, + arg->server, arg->server->attr_bitmask); break; case NFS4_CREATE_GUARDED: *p = cpu_to_be32(NFS4_CREATE_GUARDED); - encode_attrs(xdr, arg->u.attrs, arg->label, arg->server, false, - &arg->umask); + encode_attrs(xdr, arg->u.attrs, arg->label, &arg->umask, + arg->server, arg->server->attr_bitmask); break; case NFS4_CREATE_EXCLUSIVE: *p = cpu_to_be32(NFS4_CREATE_EXCLUSIVE); @@ -1424,8 +1418,8 @@ static inline void encode_createmode(struct xdr_stream *xdr, const struct nfs_op case NFS4_CREATE_EXCLUSIVE4_1: *p = cpu_to_be32(NFS4_CREATE_EXCLUSIVE4_1); encode_nfs4_verifier(xdr, &arg->u.verifier); - encode_attrs(xdr, arg->u.attrs, arg->label, arg->server, true, - &arg->umask); + encode_attrs(xdr, arg->u.attrs, arg->label, &arg->umask, + arg->server, arg->server->exclcreat_bitmask); } } @@ -1681,7 +1675,8 @@ static void encode_setattr(struct xdr_stream *xdr, const struct nfs_setattrargs { encode_op_hdr(xdr, OP_SETATTR, decode_setattr_maxsz, hdr); encode_nfs4_stateid(xdr, &arg->stateid); - encode_attrs(xdr, arg->iap, arg->label, server, false, NULL); + encode_attrs(xdr, arg->iap, arg->label, NULL, server, + server->attr_bitmask); } static void encode_setclientid(struct xdr_stream *xdr, const struct nfs4_setclientid *setclientid, struct compound_hdr *hdr)