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582 lines
14 KiB
582 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* XDR support for nfsd |
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* |
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* Copyright (C) 1995, 1996 Olaf Kirch <[email protected]> |
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*/ |
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|
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#include "vfs.h" |
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#include "xdr.h" |
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#include "auth.h" |
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|
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#define NFSDDBG_FACILITY NFSDDBG_XDR |
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|
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/* |
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* Mapping of S_IF* types to NFS file types |
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*/ |
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static u32 nfs_ftypes[] = { |
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NFNON, NFCHR, NFCHR, NFBAD, |
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NFDIR, NFBAD, NFBLK, NFBAD, |
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NFREG, NFBAD, NFLNK, NFBAD, |
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NFSOCK, NFBAD, NFLNK, NFBAD, |
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}; |
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|
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/* |
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* Basic NFSv2 data types (RFC 1094 Section 2.3) |
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*/ |
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|
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/** |
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* svcxdr_decode_fhandle - Decode an NFSv2 file handle |
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* @xdr: XDR stream positioned at an encoded NFSv2 FH |
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* @fhp: OUT: filled-in server file handle |
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* |
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* Return values: |
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* %false: The encoded file handle was not valid |
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* %true: @fhp has been initialized |
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*/ |
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bool |
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svcxdr_decode_fhandle(struct xdr_stream *xdr, struct svc_fh *fhp) |
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{ |
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__be32 *p; |
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|
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p = xdr_inline_decode(xdr, NFS_FHSIZE); |
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if (!p) |
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return false; |
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fh_init(fhp, NFS_FHSIZE); |
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memcpy(&fhp->fh_handle.fh_base, p, NFS_FHSIZE); |
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fhp->fh_handle.fh_size = NFS_FHSIZE; |
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|
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return true; |
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} |
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|
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static __be32 * |
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encode_fh(__be32 *p, struct svc_fh *fhp) |
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{ |
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memcpy(p, &fhp->fh_handle.fh_base, NFS_FHSIZE); |
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return p + (NFS_FHSIZE>> 2); |
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} |
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|
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static bool |
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svcxdr_decode_filename(struct xdr_stream *xdr, char **name, unsigned int *len) |
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{ |
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u32 size, i; |
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__be32 *p; |
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char *c; |
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|
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if (xdr_stream_decode_u32(xdr, &size) < 0) |
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return false; |
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if (size == 0 || size > NFS_MAXNAMLEN) |
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return false; |
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p = xdr_inline_decode(xdr, size); |
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if (!p) |
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return false; |
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|
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*len = size; |
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*name = (char *)p; |
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for (i = 0, c = *name; i < size; i++, c++) |
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if (*c == '\0' || *c == '/') |
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return false; |
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|
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return true; |
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} |
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|
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static bool |
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svcxdr_decode_diropargs(struct xdr_stream *xdr, struct svc_fh *fhp, |
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char **name, unsigned int *len) |
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{ |
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return svcxdr_decode_fhandle(xdr, fhp) && |
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svcxdr_decode_filename(xdr, name, len); |
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} |
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|
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static bool |
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svcxdr_decode_sattr(struct svc_rqst *rqstp, struct xdr_stream *xdr, |
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struct iattr *iap) |
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{ |
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u32 tmp1, tmp2; |
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__be32 *p; |
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|
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p = xdr_inline_decode(xdr, XDR_UNIT * 8); |
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if (!p) |
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return false; |
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|
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iap->ia_valid = 0; |
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|
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/* |
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* Some Sun clients put 0xffff in the mode field when they |
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* mean 0xffffffff. |
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*/ |
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tmp1 = be32_to_cpup(p++); |
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if (tmp1 != (u32)-1 && tmp1 != 0xffff) { |
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iap->ia_valid |= ATTR_MODE; |
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iap->ia_mode = tmp1; |
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} |
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|
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tmp1 = be32_to_cpup(p++); |
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if (tmp1 != (u32)-1) { |
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iap->ia_uid = make_kuid(nfsd_user_namespace(rqstp), tmp1); |
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if (uid_valid(iap->ia_uid)) |
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iap->ia_valid |= ATTR_UID; |
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} |
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|
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tmp1 = be32_to_cpup(p++); |
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if (tmp1 != (u32)-1) { |
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iap->ia_gid = make_kgid(nfsd_user_namespace(rqstp), tmp1); |
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if (gid_valid(iap->ia_gid)) |
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iap->ia_valid |= ATTR_GID; |
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} |
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|
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tmp1 = be32_to_cpup(p++); |
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if (tmp1 != (u32)-1) { |
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iap->ia_valid |= ATTR_SIZE; |
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iap->ia_size = tmp1; |
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} |
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|
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tmp1 = be32_to_cpup(p++); |
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tmp2 = be32_to_cpup(p++); |
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if (tmp1 != (u32)-1 && tmp2 != (u32)-1) { |
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iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET; |
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iap->ia_atime.tv_sec = tmp1; |
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iap->ia_atime.tv_nsec = tmp2 * NSEC_PER_USEC; |
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} |
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|
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tmp1 = be32_to_cpup(p++); |
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tmp2 = be32_to_cpup(p++); |
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if (tmp1 != (u32)-1 && tmp2 != (u32)-1) { |
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iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET; |
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iap->ia_mtime.tv_sec = tmp1; |
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iap->ia_mtime.tv_nsec = tmp2 * NSEC_PER_USEC; |
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/* |
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* Passing the invalid value useconds=1000000 for mtime |
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* is a Sun convention for "set both mtime and atime to |
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* current server time". It's needed to make permissions |
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* checks for the "touch" program across v2 mounts to |
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* Solaris and Irix boxes work correctly. See description of |
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* sattr in section 6.1 of "NFS Illustrated" by |
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* Brent Callaghan, Addison-Wesley, ISBN 0-201-32750-5 |
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*/ |
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if (tmp2 == 1000000) |
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iap->ia_valid &= ~(ATTR_ATIME_SET|ATTR_MTIME_SET); |
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} |
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|
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return true; |
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} |
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|
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static __be32 * |
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encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp, |
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struct kstat *stat) |
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{ |
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struct user_namespace *userns = nfsd_user_namespace(rqstp); |
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struct dentry *dentry = fhp->fh_dentry; |
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int type; |
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struct timespec64 time; |
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u32 f; |
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|
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type = (stat->mode & S_IFMT); |
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|
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*p++ = htonl(nfs_ftypes[type >> 12]); |
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*p++ = htonl((u32) stat->mode); |
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*p++ = htonl((u32) stat->nlink); |
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*p++ = htonl((u32) from_kuid_munged(userns, stat->uid)); |
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*p++ = htonl((u32) from_kgid_munged(userns, stat->gid)); |
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|
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if (S_ISLNK(type) && stat->size > NFS_MAXPATHLEN) { |
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*p++ = htonl(NFS_MAXPATHLEN); |
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} else { |
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*p++ = htonl((u32) stat->size); |
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} |
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*p++ = htonl((u32) stat->blksize); |
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if (S_ISCHR(type) || S_ISBLK(type)) |
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*p++ = htonl(new_encode_dev(stat->rdev)); |
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else |
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*p++ = htonl(0xffffffff); |
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*p++ = htonl((u32) stat->blocks); |
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switch (fsid_source(fhp)) { |
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default: |
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case FSIDSOURCE_DEV: |
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*p++ = htonl(new_encode_dev(stat->dev)); |
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break; |
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case FSIDSOURCE_FSID: |
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*p++ = htonl((u32) fhp->fh_export->ex_fsid); |
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break; |
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case FSIDSOURCE_UUID: |
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f = ((u32*)fhp->fh_export->ex_uuid)[0]; |
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f ^= ((u32*)fhp->fh_export->ex_uuid)[1]; |
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f ^= ((u32*)fhp->fh_export->ex_uuid)[2]; |
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f ^= ((u32*)fhp->fh_export->ex_uuid)[3]; |
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*p++ = htonl(f); |
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break; |
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} |
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*p++ = htonl((u32) stat->ino); |
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*p++ = htonl((u32) stat->atime.tv_sec); |
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*p++ = htonl(stat->atime.tv_nsec ? stat->atime.tv_nsec / 1000 : 0); |
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time = stat->mtime; |
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lease_get_mtime(d_inode(dentry), &time); |
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*p++ = htonl((u32) time.tv_sec); |
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*p++ = htonl(time.tv_nsec ? time.tv_nsec / 1000 : 0); |
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*p++ = htonl((u32) stat->ctime.tv_sec); |
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*p++ = htonl(stat->ctime.tv_nsec ? stat->ctime.tv_nsec / 1000 : 0); |
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|
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return p; |
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} |
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|
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/* Helper function for NFSv2 ACL code */ |
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__be32 *nfs2svc_encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp, struct kstat *stat) |
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{ |
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return encode_fattr(rqstp, p, fhp, stat); |
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} |
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|
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/* |
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* XDR decode functions |
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*/ |
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|
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int |
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nfssvc_decode_fhandleargs(struct svc_rqst *rqstp, __be32 *p) |
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{ |
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struct xdr_stream *xdr = &rqstp->rq_arg_stream; |
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struct nfsd_fhandle *args = rqstp->rq_argp; |
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|
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return svcxdr_decode_fhandle(xdr, &args->fh); |
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} |
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int |
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nfssvc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p) |
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{ |
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struct xdr_stream *xdr = &rqstp->rq_arg_stream; |
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struct nfsd_sattrargs *args = rqstp->rq_argp; |
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|
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return svcxdr_decode_fhandle(xdr, &args->fh) && |
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svcxdr_decode_sattr(rqstp, xdr, &args->attrs); |
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} |
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|
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int |
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nfssvc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p) |
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{ |
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struct xdr_stream *xdr = &rqstp->rq_arg_stream; |
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struct nfsd_diropargs *args = rqstp->rq_argp; |
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|
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return svcxdr_decode_diropargs(xdr, &args->fh, &args->name, &args->len); |
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} |
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int |
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nfssvc_decode_readargs(struct svc_rqst *rqstp, __be32 *p) |
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{ |
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struct xdr_stream *xdr = &rqstp->rq_arg_stream; |
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struct nfsd_readargs *args = rqstp->rq_argp; |
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u32 totalcount; |
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if (!svcxdr_decode_fhandle(xdr, &args->fh)) |
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return 0; |
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if (xdr_stream_decode_u32(xdr, &args->offset) < 0) |
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return 0; |
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if (xdr_stream_decode_u32(xdr, &args->count) < 0) |
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return 0; |
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/* totalcount is ignored */ |
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if (xdr_stream_decode_u32(xdr, &totalcount) < 0) |
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return 0; |
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|
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return 1; |
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} |
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|
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int |
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nfssvc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p) |
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{ |
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struct xdr_stream *xdr = &rqstp->rq_arg_stream; |
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struct nfsd_writeargs *args = rqstp->rq_argp; |
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struct kvec *head = rqstp->rq_arg.head; |
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struct kvec *tail = rqstp->rq_arg.tail; |
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u32 beginoffset, totalcount; |
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size_t remaining; |
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|
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if (!svcxdr_decode_fhandle(xdr, &args->fh)) |
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return 0; |
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/* beginoffset is ignored */ |
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if (xdr_stream_decode_u32(xdr, &beginoffset) < 0) |
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return 0; |
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if (xdr_stream_decode_u32(xdr, &args->offset) < 0) |
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return 0; |
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/* totalcount is ignored */ |
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if (xdr_stream_decode_u32(xdr, &totalcount) < 0) |
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return 0; |
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|
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/* opaque data */ |
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if (xdr_stream_decode_u32(xdr, &args->len) < 0) |
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return 0; |
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if (args->len > NFSSVC_MAXBLKSIZE_V2) |
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return 0; |
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remaining = head->iov_len + rqstp->rq_arg.page_len + tail->iov_len; |
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remaining -= xdr_stream_pos(xdr); |
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if (remaining < xdr_align_size(args->len)) |
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return 0; |
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args->first.iov_base = xdr->p; |
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args->first.iov_len = head->iov_len - xdr_stream_pos(xdr); |
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|
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return 1; |
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} |
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|
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int |
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nfssvc_decode_createargs(struct svc_rqst *rqstp, __be32 *p) |
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{ |
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struct xdr_stream *xdr = &rqstp->rq_arg_stream; |
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struct nfsd_createargs *args = rqstp->rq_argp; |
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|
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return svcxdr_decode_diropargs(xdr, &args->fh, |
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&args->name, &args->len) && |
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svcxdr_decode_sattr(rqstp, xdr, &args->attrs); |
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} |
|
|
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int |
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nfssvc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p) |
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{ |
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struct xdr_stream *xdr = &rqstp->rq_arg_stream; |
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struct nfsd_renameargs *args = rqstp->rq_argp; |
|
|
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return svcxdr_decode_diropargs(xdr, &args->ffh, |
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&args->fname, &args->flen) && |
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svcxdr_decode_diropargs(xdr, &args->tfh, |
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&args->tname, &args->tlen); |
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} |
|
|
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int |
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nfssvc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p) |
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{ |
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struct xdr_stream *xdr = &rqstp->rq_arg_stream; |
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struct nfsd_linkargs *args = rqstp->rq_argp; |
|
|
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return svcxdr_decode_fhandle(xdr, &args->ffh) && |
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svcxdr_decode_diropargs(xdr, &args->tfh, |
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&args->tname, &args->tlen); |
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} |
|
|
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int |
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nfssvc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p) |
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{ |
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struct xdr_stream *xdr = &rqstp->rq_arg_stream; |
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struct nfsd_symlinkargs *args = rqstp->rq_argp; |
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struct kvec *head = rqstp->rq_arg.head; |
|
|
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if (!svcxdr_decode_diropargs(xdr, &args->ffh, &args->fname, &args->flen)) |
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return 0; |
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if (xdr_stream_decode_u32(xdr, &args->tlen) < 0) |
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return 0; |
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if (args->tlen == 0) |
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return 0; |
|
|
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args->first.iov_len = head->iov_len - xdr_stream_pos(xdr); |
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args->first.iov_base = xdr_inline_decode(xdr, args->tlen); |
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if (!args->first.iov_base) |
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return 0; |
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return svcxdr_decode_sattr(rqstp, xdr, &args->attrs); |
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} |
|
|
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int |
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nfssvc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p) |
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{ |
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struct xdr_stream *xdr = &rqstp->rq_arg_stream; |
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struct nfsd_readdirargs *args = rqstp->rq_argp; |
|
|
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if (!svcxdr_decode_fhandle(xdr, &args->fh)) |
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return 0; |
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if (xdr_stream_decode_u32(xdr, &args->cookie) < 0) |
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return 0; |
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if (xdr_stream_decode_u32(xdr, &args->count) < 0) |
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return 0; |
|
|
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return 1; |
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} |
|
|
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/* |
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* XDR encode functions |
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*/ |
|
|
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int |
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nfssvc_encode_stat(struct svc_rqst *rqstp, __be32 *p) |
|
{ |
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struct nfsd_stat *resp = rqstp->rq_resp; |
|
|
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*p++ = resp->status; |
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return xdr_ressize_check(rqstp, p); |
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} |
|
|
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int |
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nfssvc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p) |
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{ |
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struct nfsd_attrstat *resp = rqstp->rq_resp; |
|
|
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*p++ = resp->status; |
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if (resp->status != nfs_ok) |
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goto out; |
|
p = encode_fattr(rqstp, p, &resp->fh, &resp->stat); |
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out: |
|
return xdr_ressize_check(rqstp, p); |
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} |
|
|
|
int |
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nfssvc_encode_diropres(struct svc_rqst *rqstp, __be32 *p) |
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{ |
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struct nfsd_diropres *resp = rqstp->rq_resp; |
|
|
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*p++ = resp->status; |
|
if (resp->status != nfs_ok) |
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goto out; |
|
p = encode_fh(p, &resp->fh); |
|
p = encode_fattr(rqstp, p, &resp->fh, &resp->stat); |
|
out: |
|
return xdr_ressize_check(rqstp, p); |
|
} |
|
|
|
int |
|
nfssvc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p) |
|
{ |
|
struct nfsd_readlinkres *resp = rqstp->rq_resp; |
|
struct kvec *head = rqstp->rq_res.head; |
|
|
|
*p++ = resp->status; |
|
if (resp->status != nfs_ok) |
|
return xdr_ressize_check(rqstp, p); |
|
|
|
*p++ = htonl(resp->len); |
|
xdr_ressize_check(rqstp, p); |
|
rqstp->rq_res.page_len = resp->len; |
|
if (resp->len & 3) { |
|
/* need to pad the tail */ |
|
rqstp->rq_res.tail[0].iov_base = p; |
|
*p = 0; |
|
rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3); |
|
} |
|
if (svc_encode_result_payload(rqstp, head->iov_len, resp->len)) |
|
return 0; |
|
return 1; |
|
} |
|
|
|
int |
|
nfssvc_encode_readres(struct svc_rqst *rqstp, __be32 *p) |
|
{ |
|
struct nfsd_readres *resp = rqstp->rq_resp; |
|
struct kvec *head = rqstp->rq_res.head; |
|
|
|
*p++ = resp->status; |
|
if (resp->status != nfs_ok) |
|
return xdr_ressize_check(rqstp, p); |
|
|
|
p = encode_fattr(rqstp, p, &resp->fh, &resp->stat); |
|
*p++ = htonl(resp->count); |
|
xdr_ressize_check(rqstp, p); |
|
|
|
/* now update rqstp->rq_res to reflect data as well */ |
|
rqstp->rq_res.page_len = resp->count; |
|
if (resp->count & 3) { |
|
/* need to pad the tail */ |
|
rqstp->rq_res.tail[0].iov_base = p; |
|
*p = 0; |
|
rqstp->rq_res.tail[0].iov_len = 4 - (resp->count&3); |
|
} |
|
if (svc_encode_result_payload(rqstp, head->iov_len, resp->count)) |
|
return 0; |
|
return 1; |
|
} |
|
|
|
int |
|
nfssvc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p) |
|
{ |
|
struct nfsd_readdirres *resp = rqstp->rq_resp; |
|
|
|
*p++ = resp->status; |
|
if (resp->status != nfs_ok) |
|
return xdr_ressize_check(rqstp, p); |
|
|
|
xdr_ressize_check(rqstp, p); |
|
p = resp->buffer; |
|
*p++ = 0; /* no more entries */ |
|
*p++ = htonl((resp->common.err == nfserr_eof)); |
|
rqstp->rq_res.page_len = (((unsigned long)p-1) & ~PAGE_MASK)+1; |
|
|
|
return 1; |
|
} |
|
|
|
int |
|
nfssvc_encode_statfsres(struct svc_rqst *rqstp, __be32 *p) |
|
{ |
|
struct nfsd_statfsres *resp = rqstp->rq_resp; |
|
struct kstatfs *stat = &resp->stats; |
|
|
|
*p++ = resp->status; |
|
if (resp->status != nfs_ok) |
|
return xdr_ressize_check(rqstp, p); |
|
|
|
*p++ = htonl(NFSSVC_MAXBLKSIZE_V2); /* max transfer size */ |
|
*p++ = htonl(stat->f_bsize); |
|
*p++ = htonl(stat->f_blocks); |
|
*p++ = htonl(stat->f_bfree); |
|
*p++ = htonl(stat->f_bavail); |
|
return xdr_ressize_check(rqstp, p); |
|
} |
|
|
|
int |
|
nfssvc_encode_entry(void *ccdv, const char *name, |
|
int namlen, loff_t offset, u64 ino, unsigned int d_type) |
|
{ |
|
struct readdir_cd *ccd = ccdv; |
|
struct nfsd_readdirres *cd = container_of(ccd, struct nfsd_readdirres, common); |
|
__be32 *p = cd->buffer; |
|
int buflen, slen; |
|
|
|
/* |
|
dprintk("nfsd: entry(%.*s off %ld ino %ld)\n", |
|
namlen, name, offset, ino); |
|
*/ |
|
|
|
if (offset > ~((u32) 0)) { |
|
cd->common.err = nfserr_fbig; |
|
return -EINVAL; |
|
} |
|
if (cd->offset) |
|
*cd->offset = htonl(offset); |
|
|
|
/* truncate filename */ |
|
namlen = min(namlen, NFS2_MAXNAMLEN); |
|
slen = XDR_QUADLEN(namlen); |
|
|
|
if ((buflen = cd->buflen - slen - 4) < 0) { |
|
cd->common.err = nfserr_toosmall; |
|
return -EINVAL; |
|
} |
|
if (ino > ~((u32) 0)) { |
|
cd->common.err = nfserr_fbig; |
|
return -EINVAL; |
|
} |
|
*p++ = xdr_one; /* mark entry present */ |
|
*p++ = htonl((u32) ino); /* file id */ |
|
p = xdr_encode_array(p, name, namlen);/* name length & name */ |
|
cd->offset = p; /* remember pointer */ |
|
*p++ = htonl(~0U); /* offset of next entry */ |
|
|
|
cd->buflen = buflen; |
|
cd->buffer = p; |
|
cd->common.err = nfs_ok; |
|
return 0; |
|
} |
|
|
|
/* |
|
* XDR release functions |
|
*/ |
|
void nfssvc_release_attrstat(struct svc_rqst *rqstp) |
|
{ |
|
struct nfsd_attrstat *resp = rqstp->rq_resp; |
|
|
|
fh_put(&resp->fh); |
|
} |
|
|
|
void nfssvc_release_diropres(struct svc_rqst *rqstp) |
|
{ |
|
struct nfsd_diropres *resp = rqstp->rq_resp; |
|
|
|
fh_put(&resp->fh); |
|
} |
|
|
|
void nfssvc_release_readres(struct svc_rqst *rqstp) |
|
{ |
|
struct nfsd_readres *resp = rqstp->rq_resp; |
|
|
|
fh_put(&resp->fh); |
|
}
|
|
|