Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0
/*
 * 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"
#include "trace.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(d_inode(parent), MAY_EXEC);
<------><------>if (err < 0) {
<------><------><------>dput(parent);
<------><------><------>break;
<------><------>}
<------><------>dput(tdentry);
<------><------>tdentry = parent;
<------>}
<------>if (tdentry != exp->ex_path.dentry)
<------><------>dprintk("nfsd_acceptable failed at %p %pd\n", tdentry, tdentry);
<------>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, struct dentry *dentry,
<------><------>umode_t requested)
{
<------>umode_t mode = d_inode(dentry)->i_mode & S_IFMT;
 
<------>if (requested == 0) /* the caller doesn't care */
<------><------>return nfs_ok;
<------>if (mode == requested) {
<------><------>if (mode == S_IFDIR && !d_can_lookup(dentry)) {
<------><------><------>WARN_ON_ONCE(1);
<------><------><------>return nfserr_notdir;
<------><------>}
<------><------>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 bool nfsd_originating_port_ok(struct svc_rqst *rqstp, int flags)
{
<------>if (flags & NFSEXP_INSECURE_PORT)
<------><------>return true;
<------>/* We don't require gss requests to use low ports: */
<------>if (rqstp->rq_cred.cr_flavor >= RPC_AUTH_GSS)
<------><------>return true;
<------>return test_bit(RQ_SECURE, &rqstp->rq_flags);
}
 
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 (!nfsd_originating_port_ok(rqstp, flags)) {
<------><------>RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
<------><------>dprintk("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(!d_is_dir(dentry) &&
<------><------>     !d_is_symlink(dentry)))
<------><------>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;
<------><------><------>/*
<------><------><------> * struct knfsd_fh uses host-endian fields, which are
<------><------><------> * sometimes used to hold net-endian values. This
<------><------><------> * confuses sparse, so we must use __force here to
<------><------><------> * keep it from complaining.
<------><------><------> */
<------><------><------>fh->fh_fsid[0] = new_encode_dev(MKDEV(ntohl((__force __be32)fh->fh_fsid[0]),
<------><------><------><------><------><------><------>ntohl((__force __be32)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_fsid);
<------><------>fid = (struct fid *)(fh->fh_fsid + 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 (IS_ERR(exp)) {
<------><------>trace_nfsd_set_fh_dentry_badexport(rqstp, fhp, PTR_ERR(exp));
 
<------><------>if (PTR_ERR(exp) == -ENOENT)
<------><------><------>return error;
 
<------><------>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) {
<------><------><------>error =  nfserrno(-ENOMEM);
<------><------><------>goto out;
<------><------>}
<------><------>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 (IS_ERR_OR_NULL(dentry))
<------><------><------>trace_nfsd_set_fh_dentry_badhandle(rqstp, fhp,
<------><------><------><------><------>dentry ?  PTR_ERR(dentry) : -ESTALE);
<------>}
<------>if (dentry == NULL)
<------><------>goto out;
<------>if (IS_ERR(dentry)) {
<------><------>if (PTR_ERR(dentry) != -EINVAL)
<------><------><------>error = nfserrno(PTR_ERR(dentry));
<------><------>goto out;
<------>}
 
<------>if (d_is_dir(dentry) &&
<------><------><------>(dentry->d_flags & DCACHE_DISCONNECTED)) {
<------><------>printk("nfsd: find_fh_dentry returned a DISCONNECTED directory: %pd2\n",
<------><------><------><------>dentry);
<------>}
 
<------>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
 * fs/nfsd/vfs.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, 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: %pd2 permission failure, "
<------><------><------>"acc=%x, error=%d\n",
<------><------><------>dentry,
<------><------><------>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_fsid + 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(d_inode(dentry)->i_ino);
<------>fh->ofh_generation = d_inode(dentry)->i_generation;
<------>if (d_is_dir(dentry) ||
<------>    (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_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 false;
<------><------>fallthrough;
<------>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 false;
<------><------>fallthrough;
<------>case FSID_UUID4_INUM:
<------>case FSID_UUID16_INUM:
<------><------>return exp->ex_uuid != NULL;
<------>}
<------>return true;
}
 
 
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 = d_inode(dentry);
<------>dev_t ex_dev = exp_sb(exp)->s_dev;
 
<------>dprintk("nfsd: fh_compose(exp %02x:%02x/%ld %pd2, ino=%ld)\n",
<------><------>MAJOR(ex_dev), MINOR(ex_dev),
<------><------>(long) d_inode(exp->ex_path.dentry)->i_ino,
<------><------>dentry,
<------><------>(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 %pd2 not initialized!\n",
<------><------>       dentry);
<------>}
<------>if (fhp->fh_maxsize < NFS_FHSIZE)
<------><------>printk(KERN_ERR "fh_compose: called with maxsize %d! %pd2\n",
<------><------>       fhp->fh_maxsize,
<------><------>       dentry);
 
<------>fhp->fh_dentry = dget(dentry); /* our internal copy */
<------>fhp->fh_export = exp_get(exp);
 
<------>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(d_inode(exp->ex_path.dentry)->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 {
<------><------>fhp->fh_handle.fh_size =
<------><------><------>key_len(fhp->fh_handle.fh_fsid_type) + 4;
<------><------>fhp->fh_handle.fh_auth_type = 0;
 
<------><------>mk_fsid(fhp->fh_handle.fh_fsid_type,
<------><------><------>fhp->fh_handle.fh_fsid,
<------><------><------>ex_dev,
<------><------><------>d_inode(exp->ex_path.dentry)->i_ino,
<------><------><------>exp->ex_fsid, exp->ex_uuid);
 
<------><------>if (inode)
<------><------><------>_fh_update(fhp, exp, dentry);
<------><------>if (fhp->fh_handle.fh_fileid_type == FILEID_INVALID) {
<------><------><------>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 (d_really_is_negative(dentry))
<------><------>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)
<------><------><------>return 0;
 
<------><------>_fh_update(fhp, fhp->fh_export, dentry);
<------><------>if (fhp->fh_handle.fh_fileid_type == FILEID_INVALID)
<------><------><------>return nfserr_opnotsupp;
<------>}
<------>return 0;
out_bad:
<------>printk(KERN_ERR "fh_update: fh not verified!\n");
<------>return nfserr_serverfault;
out_negative:
<------>printk(KERN_ERR "fh_update: %pd2 still negative!\n",
<------><------>dentry);
<------>return nfserr_serverfault;
}
 
/*
 * 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);
<------><------>fh_clear_wcc(fhp);
<------>}
<------>fh_drop_write(fhp);
<------>if (exp) {
<------><------>exp_put(exp);
<------><------>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;
}