mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-15 05:11:32 +00:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
533 lines
14 KiB
C
533 lines
14 KiB
C
/*
|
|
* linux/fs/nfsd/nfsfh.c
|
|
*
|
|
* 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/sched.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/smp_lock.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/unistd.h>
|
|
#include <linux/string.h>
|
|
#include <linux/stat.h>
|
|
#include <linux/dcache.h>
|
|
#include <linux/mount.h>
|
|
#include <asm/pgtable.h>
|
|
|
|
#include <linux/sunrpc/svc.h>
|
|
#include <linux/nfsd/nfsd.h>
|
|
|
|
#define NFSDDBG_FACILITY NFSDDBG_FH
|
|
#define NFSD_PARANOIA 1
|
|
/* #define NFSD_DEBUG_VERBOSE 1 */
|
|
|
|
|
|
static int nfsd_nr_verified;
|
|
static int nfsd_nr_put;
|
|
|
|
extern struct export_operations export_op_default;
|
|
|
|
#define CALL(ops,fun) ((ops->fun)?(ops->fun):export_op_default.fun)
|
|
|
|
/*
|
|
* 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_dentry && ! IS_ROOT(tdentry)) {
|
|
/* make sure parents give x permission to user */
|
|
int err;
|
|
parent = dget_parent(tdentry);
|
|
err = permission(parent->d_inode, MAY_EXEC, NULL);
|
|
if (err < 0) {
|
|
dput(parent);
|
|
break;
|
|
}
|
|
dput(tdentry);
|
|
tdentry = parent;
|
|
}
|
|
if (tdentry != exp->ex_dentry)
|
|
dprintk("nfsd_acceptable failed at %p %s\n", tdentry, tdentry->d_name.name);
|
|
rv = (tdentry == exp->ex_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 int
|
|
nfsd_mode_check(struct svc_rqst *rqstp, umode_t mode, int type)
|
|
{
|
|
/* Type can be negative when creating hardlinks - not to a dir */
|
|
if (type > 0 && (mode & S_IFMT) != type) {
|
|
if (rqstp->rq_vers == 4 && (mode & S_IFMT) == S_IFLNK)
|
|
return nfserr_symlink;
|
|
else if (type == S_IFDIR)
|
|
return nfserr_notdir;
|
|
else if ((mode & S_IFMT) == S_IFDIR)
|
|
return nfserr_isdir;
|
|
else
|
|
return nfserr_inval;
|
|
}
|
|
if (type < 0 && (mode & S_IFMT) == -type) {
|
|
if (rqstp->rq_vers == 4 && (mode & S_IFMT) == S_IFLNK)
|
|
return nfserr_symlink;
|
|
else if (type == -S_IFDIR)
|
|
return nfserr_isdir;
|
|
else
|
|
return nfserr_notdir;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Perform sanity checks on the dentry in a client's file handle.
|
|
*
|
|
* Note that the file handle dentry may need to be freed even after
|
|
* an error return.
|
|
*
|
|
* This is only called at the start of an nfsproc call, so fhp points to
|
|
* a svc_fh which is all 0 except for the over-the-wire file handle.
|
|
*/
|
|
u32
|
|
fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, int access)
|
|
{
|
|
struct knfsd_fh *fh = &fhp->fh_handle;
|
|
struct svc_export *exp = NULL;
|
|
struct dentry *dentry;
|
|
u32 error = 0;
|
|
|
|
dprintk("nfsd: fh_verify(%s)\n", SVCFH_fmt(fhp));
|
|
|
|
/* keep this filehandle for possible reference when encoding attributes */
|
|
rqstp->rq_reffh = fh;
|
|
|
|
if (!fhp->fh_dentry) {
|
|
__u32 *datap=NULL;
|
|
__u32 tfh[3]; /* filehandle fragment for oldstyle filehandles */
|
|
int fileid_type;
|
|
int data_left = fh->fh_size/4;
|
|
|
|
error = nfserr_stale;
|
|
if (rqstp->rq_client == NULL)
|
|
goto out;
|
|
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;
|
|
datap = fh->fh_auth;
|
|
if (--data_left<0) goto out;
|
|
switch (fh->fh_auth_type) {
|
|
case 0: break;
|
|
default: goto out;
|
|
}
|
|
len = key_len(fh->fh_fsid_type) / 4;
|
|
if (len == 0) goto out;
|
|
if (fh->fh_fsid_type == 2) {
|
|
/* deprecated, convert to type 3 */
|
|
len = 3;
|
|
fh->fh_fsid_type = 3;
|
|
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];
|
|
}
|
|
if ((data_left -= len)<0) goto out;
|
|
exp = exp_find(rqstp->rq_client, fh->fh_fsid_type, datap, &rqstp->rq_chandle);
|
|
datap += len;
|
|
} else {
|
|
dev_t xdev;
|
|
ino_t xino;
|
|
if (fh->fh_size != NFS_FHSIZE)
|
|
goto out;
|
|
/* assume old filehandle format */
|
|
xdev = old_decode_dev(fh->ofh_xdev);
|
|
xino = u32_to_ino_t(fh->ofh_xino);
|
|
mk_fsid_v0(tfh, xdev, xino);
|
|
exp = exp_find(rqstp->rq_client, 0, tfh, &rqstp->rq_chandle);
|
|
}
|
|
|
|
error = nfserr_dropit;
|
|
if (IS_ERR(exp) && PTR_ERR(exp) == -EAGAIN)
|
|
goto out;
|
|
|
|
error = nfserr_stale;
|
|
if (!exp || IS_ERR(exp))
|
|
goto out;
|
|
|
|
/* Check if the request originated from a secure port. */
|
|
error = nfserr_perm;
|
|
if (!rqstp->rq_secure && EX_SECURE(exp)) {
|
|
printk(KERN_WARNING
|
|
"nfsd: request from insecure port (%u.%u.%u.%u:%d)!\n",
|
|
NIPQUAD(rqstp->rq_addr.sin_addr.s_addr),
|
|
ntohs(rqstp->rq_addr.sin_port));
|
|
goto out;
|
|
}
|
|
|
|
/* Set user creds for this exportpoint */
|
|
error = nfsd_setuser(rqstp, exp);
|
|
if (error) {
|
|
error = nfserrno(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) {
|
|
tfh[0] = fh->ofh_ino;
|
|
tfh[1] = fh->ofh_generation;
|
|
tfh[2] = fh->ofh_dirino;
|
|
datap = tfh;
|
|
data_left = 3;
|
|
if (fh->ofh_dirino == 0)
|
|
fileid_type = 1;
|
|
else
|
|
fileid_type = 2;
|
|
} else
|
|
fileid_type = fh->fh_fileid_type;
|
|
|
|
if (fileid_type == 0)
|
|
dentry = dget(exp->ex_dentry);
|
|
else {
|
|
struct export_operations *nop = exp->ex_mnt->mnt_sb->s_export_op;
|
|
dentry = CALL(nop,decode_fh)(exp->ex_mnt->mnt_sb,
|
|
datap, 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;
|
|
}
|
|
#ifdef NFSD_PARANOIA
|
|
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);
|
|
}
|
|
#endif
|
|
|
|
fhp->fh_dentry = dentry;
|
|
fhp->fh_export = exp;
|
|
nfsd_nr_verified++;
|
|
} else {
|
|
/* just rechecking permissions
|
|
* (e.g. nfsproc_create calls fh_verify, then nfsd_create does as well)
|
|
*/
|
|
dprintk("nfsd: fh_verify - just checking\n");
|
|
dentry = fhp->fh_dentry;
|
|
exp = fhp->fh_export;
|
|
}
|
|
cache_get(&exp->h);
|
|
|
|
error = nfsd_mode_check(rqstp, dentry->d_inode->i_mode, type);
|
|
if (error)
|
|
goto out;
|
|
|
|
/* Finally, check access permissions. */
|
|
error = nfsd_permission(exp, dentry, access);
|
|
|
|
#ifdef NFSD_PARANOIA_EXTREME
|
|
if (error) {
|
|
printk("fh_verify: %s/%s permission failure, acc=%x, error=%d\n",
|
|
dentry->d_parent->d_name.name, dentry->d_name.name, access, (error >> 24));
|
|
}
|
|
#endif
|
|
out:
|
|
if (exp && !IS_ERR(exp))
|
|
exp_put(exp);
|
|
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 inline int _fh_update(struct dentry *dentry, struct svc_export *exp,
|
|
__u32 *datap, int *maxsize)
|
|
{
|
|
struct export_operations *nop = exp->ex_mnt->mnt_sb->s_export_op;
|
|
|
|
if (dentry == exp->ex_dentry) {
|
|
*maxsize = 0;
|
|
return 0;
|
|
}
|
|
|
|
return CALL(nop,encode_fh)(dentry, datap, maxsize,
|
|
!(exp->ex_flags&NFSEXP_NOSUBTREECHECK));
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
int
|
|
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, 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
|
|
*
|
|
*/
|
|
|
|
u8 ref_fh_version = 0;
|
|
u8 ref_fh_fsid_type = 0;
|
|
struct inode * inode = dentry->d_inode;
|
|
struct dentry *parent = dentry->d_parent;
|
|
__u32 *datap;
|
|
dev_t ex_dev = exp->ex_dentry->d_inode->i_sb->s_dev;
|
|
|
|
dprintk("nfsd: fh_compose(exp %02x:%02x/%ld %s/%s, ino=%ld)\n",
|
|
MAJOR(ex_dev), MINOR(ex_dev),
|
|
(long) exp->ex_dentry->d_inode->i_ino,
|
|
parent->d_name.name, dentry->d_name.name,
|
|
(inode ? inode->i_ino : 0));
|
|
|
|
if (ref_fh) {
|
|
ref_fh_version = ref_fh->fh_handle.fh_version;
|
|
if (ref_fh_version == 0xca)
|
|
ref_fh_fsid_type = 0;
|
|
else
|
|
ref_fh_fsid_type = ref_fh->fh_handle.fh_fsid_type;
|
|
if (ref_fh_fsid_type > 3)
|
|
ref_fh_fsid_type = 0;
|
|
|
|
/* make sure ref_fh type works for given export */
|
|
if (ref_fh_fsid_type == 1 &&
|
|
!(exp->ex_flags & NFSEXP_FSID)) {
|
|
/* if we don't have an fsid, we cannot provide one... */
|
|
ref_fh_fsid_type = 0;
|
|
}
|
|
} else if (exp->ex_flags & NFSEXP_FSID)
|
|
ref_fh_fsid_type = 1;
|
|
|
|
if (!old_valid_dev(ex_dev) && ref_fh_fsid_type == 0) {
|
|
/* for newer device numbers, we must use a newer fsid format */
|
|
ref_fh_version = 1;
|
|
ref_fh_fsid_type = 3;
|
|
}
|
|
if (old_valid_dev(ex_dev) &&
|
|
(ref_fh_fsid_type == 2 || ref_fh_fsid_type == 3))
|
|
/* must use type1 for smaller device numbers */
|
|
ref_fh_fsid_type = 0;
|
|
|
|
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 (ref_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_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_version = 1;
|
|
fhp->fh_handle.fh_auth_type = 0;
|
|
datap = fhp->fh_handle.fh_auth+0;
|
|
fhp->fh_handle.fh_fsid_type = ref_fh_fsid_type;
|
|
switch (ref_fh_fsid_type) {
|
|
case 0:
|
|
/*
|
|
* fsid_type 0:
|
|
* 2byte major, 2byte minor, 4byte inode
|
|
*/
|
|
mk_fsid_v0(datap, ex_dev,
|
|
exp->ex_dentry->d_inode->i_ino);
|
|
break;
|
|
case 1:
|
|
/* fsid_type 1 == 4 bytes filesystem id */
|
|
mk_fsid_v1(datap, exp->ex_fsid);
|
|
break;
|
|
case 2:
|
|
/*
|
|
* fsid_type 2:
|
|
* 4byte major, 4byte minor, 4byte inode
|
|
*/
|
|
mk_fsid_v2(datap, ex_dev,
|
|
exp->ex_dentry->d_inode->i_ino);
|
|
break;
|
|
case 3:
|
|
/*
|
|
* fsid_type 3:
|
|
* 4byte devicenumber, 4byte inode
|
|
*/
|
|
mk_fsid_v3(datap, ex_dev,
|
|
exp->ex_dentry->d_inode->i_ino);
|
|
break;
|
|
}
|
|
len = key_len(ref_fh_fsid_type);
|
|
datap += len/4;
|
|
fhp->fh_handle.fh_size = 4 + len;
|
|
|
|
if (inode) {
|
|
int size = (fhp->fh_maxsize-len-4)/4;
|
|
fhp->fh_handle.fh_fileid_type =
|
|
_fh_update(dentry, exp, datap, &size);
|
|
fhp->fh_handle.fh_size += size*4;
|
|
}
|
|
if (fhp->fh_handle.fh_fileid_type == 255)
|
|
return nfserr_opnotsupp;
|
|
}
|
|
|
|
nfsd_nr_verified++;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Update file handle information after changing a dentry.
|
|
* This is only called by nfsd_create, nfsd_create_v3 and nfsd_proc_create
|
|
*/
|
|
int
|
|
fh_update(struct svc_fh *fhp)
|
|
{
|
|
struct dentry *dentry;
|
|
__u32 *datap;
|
|
|
|
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 {
|
|
int size;
|
|
if (fhp->fh_handle.fh_fileid_type != 0)
|
|
goto out_uptodate;
|
|
datap = fhp->fh_handle.fh_auth+
|
|
fhp->fh_handle.fh_size/4 -1;
|
|
size = (fhp->fh_maxsize - fhp->fh_handle.fh_size)/4;
|
|
fhp->fh_handle.fh_fileid_type =
|
|
_fh_update(dentry, fhp->fh_export, datap, &size);
|
|
fhp->fh_handle.fh_size += size*4;
|
|
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;
|
|
out_uptodate:
|
|
printk(KERN_ERR "fh_update: %s/%s already up-to-date!\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
|
|
nfsd_nr_put++;
|
|
}
|
|
if (exp) {
|
|
svc_export_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;
|
|
}
|