[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/os/linux/linux-3.4.x/fs/nfsd/nfsfh.c b/ap/os/linux/linux-3.4.x/fs/nfsd/nfsfh.c
new file mode 100644
index 0000000..68454e7
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/fs/nfsd/nfsfh.c
@@ -0,0 +1,690 @@
+/*
+ * NFS server file handle treatment.
+ *
+ * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ * Portions Copyright (C) 1999 G. Allen Morris III <gam3@acm.org>
+ * Extensive rewrite by Neil Brown <neilb@cse.unsw.edu.au> Southern-Spring 1999
+ * ... and again Southern-Winter 2001 to support export_operations
+ */
+
+#include <linux/exportfs.h>
+
+#include <linux/sunrpc/svcauth_gss.h>
+#include "nfsd.h"
+#include "vfs.h"
+#include "auth.h"
+
+#define NFSDDBG_FACILITY NFSDDBG_FH
+
+
+/*
+ * our acceptability function.
+ * if NOSUBTREECHECK, accept anything
+ * if not, require that we can walk up to exp->ex_dentry
+ * doing some checks on the 'x' bits
+ */
+static int nfsd_acceptable(void *expv, struct dentry *dentry)
+{
+ struct svc_export *exp = expv;
+ int rv;
+ struct dentry *tdentry;
+ struct dentry *parent;
+
+ if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
+ return 1;
+
+ tdentry = dget(dentry);
+ while (tdentry != exp->ex_path.dentry && !IS_ROOT(tdentry)) {
+ /* make sure parents give x permission to user */
+ int err;
+ parent = dget_parent(tdentry);
+ err = inode_permission(parent->d_inode, MAY_EXEC);
+ if (err < 0) {
+ dput(parent);
+ break;
+ }
+ dput(tdentry);
+ tdentry = parent;
+ }
+ if (tdentry != exp->ex_path.dentry)
+ dprintk("nfsd_acceptable failed at %p %s\n", tdentry, tdentry->d_name.name);
+ rv = (tdentry == exp->ex_path.dentry);
+ dput(tdentry);
+ return rv;
+}
+
+/* Type check. The correct error return for type mismatches does not seem to be
+ * generally agreed upon. SunOS seems to use EISDIR if file isn't S_IFREG; a
+ * comment in the NFSv3 spec says this is incorrect (implementation notes for
+ * the write call).
+ */
+static inline __be32
+nfsd_mode_check(struct svc_rqst *rqstp, umode_t mode, umode_t requested)
+{
+ mode &= S_IFMT;
+
+ if (requested == 0) /* the caller doesn't care */
+ return nfs_ok;
+ if (mode == requested)
+ return nfs_ok;
+ /*
+ * v4 has an error more specific than err_notdir which we should
+ * return in preference to err_notdir:
+ */
+ if (rqstp->rq_vers == 4 && mode == S_IFLNK)
+ return nfserr_symlink;
+ if (requested == S_IFDIR)
+ return nfserr_notdir;
+ if (mode == S_IFDIR)
+ return nfserr_isdir;
+ return nfserr_inval;
+}
+
+static __be32 nfsd_setuser_and_check_port(struct svc_rqst *rqstp,
+ struct svc_export *exp)
+{
+ int flags = nfsexp_flags(rqstp, exp);
+
+ /* Check if the request originated from a secure port. */
+ if (!rqstp->rq_secure && !(flags & NFSEXP_INSECURE_PORT)) {
+ RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
+ dprintk(KERN_WARNING
+ "nfsd: request from insecure port %s!\n",
+ svc_print_addr(rqstp, buf, sizeof(buf)));
+ return nfserr_perm;
+ }
+
+ /* Set user creds for this exportpoint */
+ return nfserrno(nfsd_setuser(rqstp, exp));
+}
+
+static inline __be32 check_pseudo_root(struct svc_rqst *rqstp,
+ struct dentry *dentry, struct svc_export *exp)
+{
+ if (!(exp->ex_flags & NFSEXP_V4ROOT))
+ return nfs_ok;
+ /*
+ * v2/v3 clients have no need for the V4ROOT export--they use
+ * the mount protocl instead; also, further V4ROOT checks may be
+ * in v4-specific code, in which case v2/v3 clients could bypass
+ * them.
+ */
+ if (!nfsd_v4client(rqstp))
+ return nfserr_stale;
+ /*
+ * We're exposing only the directories and symlinks that have to be
+ * traversed on the way to real exports:
+ */
+ if (unlikely(!S_ISDIR(dentry->d_inode->i_mode) &&
+ !S_ISLNK(dentry->d_inode->i_mode)))
+ return nfserr_stale;
+ /*
+ * A pseudoroot export gives permission to access only one
+ * single directory; the kernel has to make another upcall
+ * before granting access to anything else under it:
+ */
+ if (unlikely(dentry != exp->ex_path.dentry))
+ return nfserr_stale;
+ return nfs_ok;
+}
+
+/*
+ * Use the given filehandle to look up the corresponding export and
+ * dentry. On success, the results are used to set fh_export and
+ * fh_dentry.
+ */
+static __be32 nfsd_set_fh_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp)
+{
+ struct knfsd_fh *fh = &fhp->fh_handle;
+ struct fid *fid = NULL, sfid;
+ struct svc_export *exp;
+ struct dentry *dentry;
+ int fileid_type;
+ int data_left = fh->fh_size/4;
+ __be32 error;
+
+ error = nfserr_stale;
+ if (rqstp->rq_vers > 2)
+ error = nfserr_badhandle;
+ if (rqstp->rq_vers == 4 && fh->fh_size == 0)
+ return nfserr_nofilehandle;
+
+ if (fh->fh_version == 1) {
+ int len;
+
+ if (--data_left < 0)
+ return error;
+ if (fh->fh_auth_type != 0)
+ return error;
+ len = key_len(fh->fh_fsid_type) / 4;
+ if (len == 0)
+ return error;
+ if (fh->fh_fsid_type == FSID_MAJOR_MINOR) {
+ /* deprecated, convert to type 3 */
+ len = key_len(FSID_ENCODE_DEV)/4;
+ fh->fh_fsid_type = FSID_ENCODE_DEV;
+ fh->fh_fsid[0] = new_encode_dev(MKDEV(ntohl(fh->fh_fsid[0]), ntohl(fh->fh_fsid[1])));
+ fh->fh_fsid[1] = fh->fh_fsid[2];
+ }
+ data_left -= len;
+ if (data_left < 0)
+ return error;
+ exp = rqst_exp_find(rqstp, fh->fh_fsid_type, fh->fh_auth);
+ fid = (struct fid *)(fh->fh_auth + len);
+ } else {
+ __u32 tfh[2];
+ dev_t xdev;
+ ino_t xino;
+
+ if (fh->fh_size != NFS_FHSIZE)
+ return error;
+ /* assume old filehandle format */
+ xdev = old_decode_dev(fh->ofh_xdev);
+ xino = u32_to_ino_t(fh->ofh_xino);
+ mk_fsid(FSID_DEV, tfh, xdev, xino, 0, NULL);
+ exp = rqst_exp_find(rqstp, FSID_DEV, tfh);
+ }
+
+ error = nfserr_stale;
+ if (PTR_ERR(exp) == -ENOENT)
+ return error;
+
+ if (IS_ERR(exp))
+ return nfserrno(PTR_ERR(exp));
+
+ if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) {
+ /* Elevate privileges so that the lack of 'r' or 'x'
+ * permission on some parent directory will
+ * not stop exportfs_decode_fh from being able
+ * to reconnect a directory into the dentry cache.
+ * The same problem can affect "SUBTREECHECK" exports,
+ * but as nfsd_acceptable depends on correct
+ * access control settings being in effect, we cannot
+ * fix that case easily.
+ */
+ struct cred *new = prepare_creds();
+ if (!new)
+ return nfserrno(-ENOMEM);
+ new->cap_effective =
+ cap_raise_nfsd_set(new->cap_effective,
+ new->cap_permitted);
+ put_cred(override_creds(new));
+ put_cred(new);
+ } else {
+ error = nfsd_setuser_and_check_port(rqstp, exp);
+ if (error)
+ goto out;
+ }
+
+ /*
+ * Look up the dentry using the NFS file handle.
+ */
+ error = nfserr_stale;
+ if (rqstp->rq_vers > 2)
+ error = nfserr_badhandle;
+
+ if (fh->fh_version != 1) {
+ sfid.i32.ino = fh->ofh_ino;
+ sfid.i32.gen = fh->ofh_generation;
+ sfid.i32.parent_ino = fh->ofh_dirino;
+ fid = &sfid;
+ data_left = 3;
+ if (fh->ofh_dirino == 0)
+ fileid_type = FILEID_INO32_GEN;
+ else
+ fileid_type = FILEID_INO32_GEN_PARENT;
+ } else
+ fileid_type = fh->fh_fileid_type;
+
+ if (fileid_type == FILEID_ROOT)
+ dentry = dget(exp->ex_path.dentry);
+ else {
+ dentry = exportfs_decode_fh(exp->ex_path.mnt, fid,
+ data_left, fileid_type,
+ nfsd_acceptable, exp);
+ }
+ if (dentry == NULL)
+ goto out;
+ if (IS_ERR(dentry)) {
+ if (PTR_ERR(dentry) != -EINVAL)
+ error = nfserrno(PTR_ERR(dentry));
+ goto out;
+ }
+
+ if (S_ISDIR(dentry->d_inode->i_mode) &&
+ (dentry->d_flags & DCACHE_DISCONNECTED)) {
+ printk("nfsd: find_fh_dentry returned a DISCONNECTED directory: %s/%s\n",
+ dentry->d_parent->d_name.name, dentry->d_name.name);
+ }
+
+ fhp->fh_dentry = dentry;
+ fhp->fh_export = exp;
+ return 0;
+out:
+ exp_put(exp);
+ return error;
+}
+
+/**
+ * fh_verify - filehandle lookup and access checking
+ * @rqstp: pointer to current rpc request
+ * @fhp: filehandle to be verified
+ * @type: expected type of object pointed to by filehandle
+ * @access: type of access needed to object
+ *
+ * Look up a dentry from the on-the-wire filehandle, check the client's
+ * access to the export, and set the current task's credentials.
+ *
+ * Regardless of success or failure of fh_verify(), fh_put() should be
+ * called on @fhp when the caller is finished with the filehandle.
+ *
+ * fh_verify() may be called multiple times on a given filehandle, for
+ * example, when processing an NFSv4 compound. The first call will look
+ * up a dentry using the on-the-wire filehandle. Subsequent calls will
+ * skip the lookup and just perform the other checks and possibly change
+ * the current task's credentials.
+ *
+ * @type specifies the type of object expected using one of the S_IF*
+ * constants defined in include/linux/stat.h. The caller may use zero
+ * to indicate that it doesn't care, or a negative integer to indicate
+ * that it expects something not of the given type.
+ *
+ * @access is formed from the NFSD_MAY_* constants defined in
+ * include/linux/nfsd/nfsd.h.
+ */
+__be32
+fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, int access)
+{
+ struct svc_export *exp;
+ struct dentry *dentry;
+ __be32 error;
+
+ dprintk("nfsd: fh_verify(%s)\n", SVCFH_fmt(fhp));
+
+ if (!fhp->fh_dentry) {
+ error = nfsd_set_fh_dentry(rqstp, fhp);
+ if (error)
+ goto out;
+ }
+ dentry = fhp->fh_dentry;
+ exp = fhp->fh_export;
+ /*
+ * We still have to do all these permission checks, even when
+ * fh_dentry is already set:
+ * - fh_verify may be called multiple times with different
+ * "access" arguments (e.g. nfsd_proc_create calls
+ * fh_verify(...,NFSD_MAY_EXEC) first, then later (in
+ * nfsd_create) calls fh_verify(...,NFSD_MAY_CREATE).
+ * - in the NFSv4 case, the filehandle may have been filled
+ * in by fh_compose, and given a dentry, but further
+ * compound operations performed with that filehandle
+ * still need permissions checks. In the worst case, a
+ * mountpoint crossing may have changed the export
+ * options, and we may now need to use a different uid
+ * (for example, if different id-squashing options are in
+ * effect on the new filesystem).
+ */
+ error = check_pseudo_root(rqstp, dentry, exp);
+ if (error)
+ goto out;
+
+ error = nfsd_setuser_and_check_port(rqstp, exp);
+ if (error)
+ goto out;
+
+ error = nfsd_mode_check(rqstp, dentry->d_inode->i_mode, type);
+ if (error)
+ goto out;
+
+ /*
+ * pseudoflavor restrictions are not enforced on NLM,
+ * which clients virtually always use auth_sys for,
+ * even while using RPCSEC_GSS for NFS.
+ */
+ if (access & NFSD_MAY_LOCK || access & NFSD_MAY_BYPASS_GSS)
+ goto skip_pseudoflavor_check;
+ /*
+ * Clients may expect to be able to use auth_sys during mount,
+ * even if they use gss for everything else; see section 2.3.2
+ * of rfc 2623.
+ */
+ if (access & NFSD_MAY_BYPASS_GSS_ON_ROOT
+ && exp->ex_path.dentry == dentry)
+ goto skip_pseudoflavor_check;
+
+ error = check_nfsd_access(exp, rqstp);
+ if (error)
+ goto out;
+
+skip_pseudoflavor_check:
+ /* Finally, check access permissions. */
+ error = nfsd_permission(rqstp, exp, dentry, access);
+
+ if (error) {
+ dprintk("fh_verify: %s/%s permission failure, "
+ "acc=%x, error=%d\n",
+ dentry->d_parent->d_name.name,
+ dentry->d_name.name,
+ access, ntohl(error));
+ }
+out:
+ if (error == nfserr_stale)
+ nfsdstats.fh_stale++;
+ return error;
+}
+
+
+/*
+ * Compose a file handle for an NFS reply.
+ *
+ * Note that when first composed, the dentry may not yet have
+ * an inode. In this case a call to fh_update should be made
+ * before the fh goes out on the wire ...
+ */
+static void _fh_update(struct svc_fh *fhp, struct svc_export *exp,
+ struct dentry *dentry)
+{
+ if (dentry != exp->ex_path.dentry) {
+ struct fid *fid = (struct fid *)
+ (fhp->fh_handle.fh_auth + fhp->fh_handle.fh_size/4 - 1);
+ int maxsize = (fhp->fh_maxsize - fhp->fh_handle.fh_size)/4;
+ int subtreecheck = !(exp->ex_flags & NFSEXP_NOSUBTREECHECK);
+
+ fhp->fh_handle.fh_fileid_type =
+ exportfs_encode_fh(dentry, fid, &maxsize, subtreecheck);
+ fhp->fh_handle.fh_size += maxsize * 4;
+ } else {
+ fhp->fh_handle.fh_fileid_type = FILEID_ROOT;
+ }
+}
+
+/*
+ * for composing old style file handles
+ */
+static inline void _fh_update_old(struct dentry *dentry,
+ struct svc_export *exp,
+ struct knfsd_fh *fh)
+{
+ fh->ofh_ino = ino_t_to_u32(dentry->d_inode->i_ino);
+ fh->ofh_generation = dentry->d_inode->i_generation;
+ if (S_ISDIR(dentry->d_inode->i_mode) ||
+ (exp->ex_flags & NFSEXP_NOSUBTREECHECK))
+ fh->ofh_dirino = 0;
+}
+
+static bool is_root_export(struct svc_export *exp)
+{
+ return exp->ex_path.dentry == exp->ex_path.dentry->d_sb->s_root;
+}
+
+static struct super_block *exp_sb(struct svc_export *exp)
+{
+ return exp->ex_path.dentry->d_inode->i_sb;
+}
+
+static bool fsid_type_ok_for_exp(u8 fsid_type, struct svc_export *exp)
+{
+ switch (fsid_type) {
+ case FSID_DEV:
+ if (!old_valid_dev(exp_sb(exp)->s_dev))
+ return 0;
+ /* FALL THROUGH */
+ case FSID_MAJOR_MINOR:
+ case FSID_ENCODE_DEV:
+ return exp_sb(exp)->s_type->fs_flags & FS_REQUIRES_DEV;
+ case FSID_NUM:
+ return exp->ex_flags & NFSEXP_FSID;
+ case FSID_UUID8:
+ case FSID_UUID16:
+ if (!is_root_export(exp))
+ return 0;
+ /* fall through */
+ case FSID_UUID4_INUM:
+ case FSID_UUID16_INUM:
+ return exp->ex_uuid != NULL;
+ }
+ return 1;
+}
+
+
+static void set_version_and_fsid_type(struct svc_fh *fhp, struct svc_export *exp, struct svc_fh *ref_fh)
+{
+ u8 version;
+ u8 fsid_type;
+retry:
+ version = 1;
+ if (ref_fh && ref_fh->fh_export == exp) {
+ version = ref_fh->fh_handle.fh_version;
+ fsid_type = ref_fh->fh_handle.fh_fsid_type;
+
+ ref_fh = NULL;
+
+ switch (version) {
+ case 0xca:
+ fsid_type = FSID_DEV;
+ break;
+ case 1:
+ break;
+ default:
+ goto retry;
+ }
+
+ /*
+ * As the fsid -> filesystem mapping was guided by
+ * user-space, there is no guarantee that the filesystem
+ * actually supports that fsid type. If it doesn't we
+ * loop around again without ref_fh set.
+ */
+ if (!fsid_type_ok_for_exp(fsid_type, exp))
+ goto retry;
+ } else if (exp->ex_flags & NFSEXP_FSID) {
+ fsid_type = FSID_NUM;
+ } else if (exp->ex_uuid) {
+ if (fhp->fh_maxsize >= 64) {
+ if (is_root_export(exp))
+ fsid_type = FSID_UUID16;
+ else
+ fsid_type = FSID_UUID16_INUM;
+ } else {
+ if (is_root_export(exp))
+ fsid_type = FSID_UUID8;
+ else
+ fsid_type = FSID_UUID4_INUM;
+ }
+ } else if (!old_valid_dev(exp_sb(exp)->s_dev))
+ /* for newer device numbers, we must use a newer fsid format */
+ fsid_type = FSID_ENCODE_DEV;
+ else
+ fsid_type = FSID_DEV;
+ fhp->fh_handle.fh_version = version;
+ if (version)
+ fhp->fh_handle.fh_fsid_type = fsid_type;
+}
+
+__be32
+fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry,
+ struct svc_fh *ref_fh)
+{
+ /* ref_fh is a reference file handle.
+ * if it is non-null and for the same filesystem, then we should compose
+ * a filehandle which is of the same version, where possible.
+ * Currently, that means that if ref_fh->fh_handle.fh_version == 0xca
+ * Then create a 32byte filehandle using nfs_fhbase_old
+ *
+ */
+
+ struct inode * inode = dentry->d_inode;
+ struct dentry *parent = dentry->d_parent;
+ __u32 *datap;
+ dev_t ex_dev = exp_sb(exp)->s_dev;
+
+ dprintk("nfsd: fh_compose(exp %02x:%02x/%ld %s/%s, ino=%ld)\n",
+ MAJOR(ex_dev), MINOR(ex_dev),
+ (long) exp->ex_path.dentry->d_inode->i_ino,
+ parent->d_name.name, dentry->d_name.name,
+ (inode ? inode->i_ino : 0));
+
+ /* Choose filehandle version and fsid type based on
+ * the reference filehandle (if it is in the same export)
+ * or the export options.
+ */
+ set_version_and_fsid_type(fhp, exp, ref_fh);
+
+ if (ref_fh == fhp)
+ fh_put(ref_fh);
+
+ if (fhp->fh_locked || fhp->fh_dentry) {
+ printk(KERN_ERR "fh_compose: fh %s/%s not initialized!\n",
+ parent->d_name.name, dentry->d_name.name);
+ }
+ if (fhp->fh_maxsize < NFS_FHSIZE)
+ printk(KERN_ERR "fh_compose: called with maxsize %d! %s/%s\n",
+ fhp->fh_maxsize,
+ parent->d_name.name, dentry->d_name.name);
+
+ fhp->fh_dentry = dget(dentry); /* our internal copy */
+ fhp->fh_export = exp;
+ cache_get(&exp->h);
+
+ if (fhp->fh_handle.fh_version == 0xca) {
+ /* old style filehandle please */
+ memset(&fhp->fh_handle.fh_base, 0, NFS_FHSIZE);
+ fhp->fh_handle.fh_size = NFS_FHSIZE;
+ fhp->fh_handle.ofh_dcookie = 0xfeebbaca;
+ fhp->fh_handle.ofh_dev = old_encode_dev(ex_dev);
+ fhp->fh_handle.ofh_xdev = fhp->fh_handle.ofh_dev;
+ fhp->fh_handle.ofh_xino =
+ ino_t_to_u32(exp->ex_path.dentry->d_inode->i_ino);
+ fhp->fh_handle.ofh_dirino = ino_t_to_u32(parent_ino(dentry));
+ if (inode)
+ _fh_update_old(dentry, exp, &fhp->fh_handle);
+ } else {
+ int len;
+ fhp->fh_handle.fh_auth_type = 0;
+ datap = fhp->fh_handle.fh_auth+0;
+ mk_fsid(fhp->fh_handle.fh_fsid_type, datap, ex_dev,
+ exp->ex_path.dentry->d_inode->i_ino,
+ exp->ex_fsid, exp->ex_uuid);
+
+ len = key_len(fhp->fh_handle.fh_fsid_type);
+ datap += len/4;
+ fhp->fh_handle.fh_size = 4 + len;
+
+ if (inode)
+ _fh_update(fhp, exp, dentry);
+ if (fhp->fh_handle.fh_fileid_type == 255) {
+ fh_put(fhp);
+ return nfserr_opnotsupp;
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * Update file handle information after changing a dentry.
+ * This is only called by nfsd_create, nfsd_create_v3 and nfsd_proc_create
+ */
+__be32
+fh_update(struct svc_fh *fhp)
+{
+ struct dentry *dentry;
+
+ if (!fhp->fh_dentry)
+ goto out_bad;
+
+ dentry = fhp->fh_dentry;
+ if (!dentry->d_inode)
+ goto out_negative;
+ if (fhp->fh_handle.fh_version != 1) {
+ _fh_update_old(dentry, fhp->fh_export, &fhp->fh_handle);
+ } else {
+ if (fhp->fh_handle.fh_fileid_type != FILEID_ROOT)
+ goto out;
+
+ _fh_update(fhp, fhp->fh_export, dentry);
+ if (fhp->fh_handle.fh_fileid_type == 255)
+ return nfserr_opnotsupp;
+ }
+out:
+ return 0;
+
+out_bad:
+ printk(KERN_ERR "fh_update: fh not verified!\n");
+ goto out;
+out_negative:
+ printk(KERN_ERR "fh_update: %s/%s still negative!\n",
+ dentry->d_parent->d_name.name, dentry->d_name.name);
+ goto out;
+}
+
+/*
+ * Release a file handle.
+ */
+void
+fh_put(struct svc_fh *fhp)
+{
+ struct dentry * dentry = fhp->fh_dentry;
+ struct svc_export * exp = fhp->fh_export;
+ if (dentry) {
+ fh_unlock(fhp);
+ fhp->fh_dentry = NULL;
+ dput(dentry);
+#ifdef CONFIG_NFSD_V3
+ fhp->fh_pre_saved = 0;
+ fhp->fh_post_saved = 0;
+#endif
+ }
+ if (exp) {
+ cache_put(&exp->h, &svc_export_cache);
+ fhp->fh_export = NULL;
+ }
+ return;
+}
+
+/*
+ * Shorthand for dprintk()'s
+ */
+char * SVCFH_fmt(struct svc_fh *fhp)
+{
+ struct knfsd_fh *fh = &fhp->fh_handle;
+
+ static char buf[80];
+ sprintf(buf, "%d: %08x %08x %08x %08x %08x %08x",
+ fh->fh_size,
+ fh->fh_base.fh_pad[0],
+ fh->fh_base.fh_pad[1],
+ fh->fh_base.fh_pad[2],
+ fh->fh_base.fh_pad[3],
+ fh->fh_base.fh_pad[4],
+ fh->fh_base.fh_pad[5]);
+ return buf;
+}
+
+enum fsid_source fsid_source(struct svc_fh *fhp)
+{
+ if (fhp->fh_handle.fh_version != 1)
+ return FSIDSOURCE_DEV;
+ switch(fhp->fh_handle.fh_fsid_type) {
+ case FSID_DEV:
+ case FSID_ENCODE_DEV:
+ case FSID_MAJOR_MINOR:
+ if (exp_sb(fhp->fh_export)->s_type->fs_flags & FS_REQUIRES_DEV)
+ return FSIDSOURCE_DEV;
+ break;
+ case FSID_NUM:
+ if (fhp->fh_export->ex_flags & NFSEXP_FSID)
+ return FSIDSOURCE_FSID;
+ break;
+ default:
+ break;
+ }
+ /* either a UUID type filehandle, or the filehandle doesn't
+ * match the export.
+ */
+ if (fhp->fh_export->ex_flags & NFSEXP_FSID)
+ return FSIDSOURCE_FSID;
+ if (fhp->fh_export->ex_uuid)
+ return FSIDSOURCE_UUID;
+ return FSIDSOURCE_DEV;
+}