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minix/lib/librefuse/refuse.c
Thomas Veerman 490e0de548 Import librefuse and libpuffs 
Import libpuffs and our port of libpuffs. The port was done as part of
GSoC 2011 FUSE project, done by Evgeniy Ivanov. The librefuse import
did not require any porting efforts. Libpuffs has been modified to
understand our VFS-FS protocol and translate between that and PUFFS. As
an example that it works, fuse-ntfs-3g from pkgsrc can be compiled and
used to mount ntfs partitions:
mount -t ntfs-3g <device> <mountpoint>

FUSE only works with the asynchronous version of VFS. See <docs/UPDATING> on
how to run AVFS.

This patch further includes some changes to mount(1) and mount(2) so it's
possible to use file systems provided by pkgsrc (note: manual modifications
to /etc/system.conf are still needed. There has been made an exception for
fuse-ntfs-3g, so it already as an entry).
2011-11-14 11:53:05 +00:00

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/* $NetBSD: refuse.c,v 1.92 2009/03/05 01:21:57 msaitoh Exp $ */
/*
* Copyright © 2007 Alistair Crooks. All rights reserved.
* Copyright © 2007 Antti Kantee. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#if !defined(lint)
__RCSID("$NetBSD: refuse.c,v 1.92 2009/03/05 01:21:57 msaitoh Exp $");
#endif /* !lint */
#include <sys/types.h>
#include <assert.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <fuse.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#ifdef MULTITHREADED_REFUSE
#include <pthread.h>
#endif
typedef uint64_t fuse_ino_t;
struct fuse_config {
uid_t uid;
gid_t gid;
mode_t umask;
double entry_timeout;
double negative_timeout;
double attr_timeout;
double ac_attr_timeout;
int ac_attr_timeout_set;
int debug;
int hard_remove;
int use_ino;
int readdir_ino;
int set_mode;
int set_uid;
int set_gid;
int direct_io;
int kernel_cache;
int auto_cache;
int intr;
int intr_signal;
};
struct fuse_chan {
const char *dir;
struct fuse_args *args;
struct puffs_usermount *pu;
int dead;
};
/* this is the private fuse structure */
struct fuse {
struct fuse_chan *fc; /* fuse channel pointer */
struct fuse_operations op; /* switch table of operations */
int compat; /* compat level -
* not used in puffs_fuse */
struct node **name_table;
size_t name_table_size;
struct node **id_table;
size_t id_table_size;
fuse_ino_t ctr;
unsigned int generation;
unsigned int hidectr;
#ifdef MULTITHREADED_REFUSE
pthread_mutex_t lock;
pthread_rwlock_t tree_lock;
#endif
void *user_data;
struct fuse_config conf;
int intr_installed;
};
struct puffs_fuse_dirh {
void *dbuf;
struct dirent *d;
size_t reslen;
size_t bufsize;
};
struct refusenode {
struct fuse_file_info file_info;
struct puffs_fuse_dirh dirh;
int opencount;
int flags;
};
#define RN_ROOT 0x01
#define RN_OPEN 0x02 /* XXX: could just use opencount */
static int fuse_setattr(struct fuse *, struct puffs_node *,
const char *, const struct vattr *);
static struct puffs_node *
newrn(struct puffs_usermount *pu)
{
struct puffs_node *pn;
struct refusenode *rn;
if ((rn = calloc(1, sizeof(*rn))) == NULL) {
err(EXIT_FAILURE, "newrn");
}
pn = puffs_pn_new(pu, rn);
return pn;
}
static void
nukern(struct puffs_node *pn)
{
struct refusenode *rn = pn->pn_data;
free(rn->dirh.dbuf);
free(rn);
puffs_pn_put(pn);
}
/* XXX - not threadsafe */
static ino_t fakeino = 3;
/***************** start of pthread context routines ************************/
/*
* Notes on fuse_context:
* we follow fuse's lead and use the pthread specific information to hold
* a reference to the fuse_context structure for this thread.
*/
#ifdef MULTITHREADED_REFUSE
static pthread_mutex_t context_mutex = PTHREAD_MUTEX_INITIALIZER;
static pthread_key_t context_key;
static unsigned long context_refc;
#endif
/* return the fuse_context struct related to this thread */
struct fuse_context *
fuse_get_context(void)
{
#ifdef MULTITHREADED_REFUSE
struct fuse_context *ctxt;
if ((ctxt = pthread_getspecific(context_key)) == NULL) {
if ((ctxt = calloc(1, sizeof(struct fuse_context))) == NULL) {
abort();
}
pthread_setspecific(context_key, ctxt);
}
return ctxt;
#else
static struct fuse_context fcon;
return &fcon;
#endif
}
/* used as a callback function */
#ifdef MULTITHREADED_REFUSE
static void
free_context(void *ctxt)
{
free(ctxt);
}
#endif
/*
* Create the pthread key. The reason for the complexity is to
* enable use of multiple fuse instances within a single process.
*/
static int
create_context_key(void)
{
#ifdef MULTITHREADED_REFUSE
int rv;
rv = pthread_mutex_lock(&context_mutex);
assert(rv == 0);
if (context_refc == 0) {
if (pthread_key_create(&context_key, free_context) != 0) {
warnx("create_context_key: pthread_key_create failed");
pthread_mutex_unlock(&context_mutex);
return 0;
}
}
context_refc += 1;
pthread_mutex_unlock(&context_mutex);
return 1;
#else
return 1;
#endif
}
static void
delete_context_key(void)
{
#ifdef MULTITHREADED_REFUSE
pthread_mutex_lock(&context_mutex);
/* If we are the last fuse instances using the key, delete it */
if (--context_refc == 0) {
free(pthread_getspecific(context_key));
pthread_key_delete(context_key);
}
pthread_mutex_unlock(&context_mutex);
#endif
}
/* set the uid and gid of the calling process in the current fuse context */
static void
set_fuse_context_uid_gid(const struct puffs_cred *cred)
{
struct fuse_context *fusectx;
uid_t uid;
gid_t gid;
fusectx = fuse_get_context();
if (puffs_cred_getuid(cred, &uid) == 0) {
fusectx->uid = uid;
}
if (puffs_cred_getgid(cred, &gid) == 0) {
fusectx->gid = gid;
}
}
/* set the pid of the calling process in the current fuse context */
static void
set_fuse_context_pid(struct puffs_usermount *pu)
{
struct puffs_cc *pcc = puffs_cc_getcc(pu);
struct fuse_context *fusectx;
fusectx = fuse_get_context();
puffs_cc_getcaller(pcc, &fusectx->pid, NULL);
}
/***************** end of pthread context routines ************************/
#define DIR_CHUNKSIZE 4096
static int
fill_dirbuf(struct puffs_fuse_dirh *dh, const char *name, ino_t dino,
uint8_t dtype)
{
/* initial? */
if (dh->bufsize == 0) {
if ((dh->dbuf = calloc(1, DIR_CHUNKSIZE)) == NULL) {
abort();
}
dh->d = dh->dbuf;
dh->reslen = dh->bufsize = DIR_CHUNKSIZE;
}
if (puffs_nextdent(&dh->d, name, dino, dtype, &dh->reslen)) {
return 0;
}
/* try to increase buffer space */
dh->dbuf = realloc(dh->dbuf, dh->bufsize + DIR_CHUNKSIZE);
if (dh->dbuf == NULL) {
abort();
}
dh->d = (void *)((uint8_t *)dh->dbuf + (dh->bufsize - dh->reslen));
dh->reslen += DIR_CHUNKSIZE;
dh->bufsize += DIR_CHUNKSIZE;
return !puffs_nextdent(&dh->d, name, dino, dtype, &dh->reslen);
}
/* ARGSUSED3 */
/* XXX: I have no idea how "off" is supposed to be used */
static int
puffs_fuse_fill_dir(void *buf, const char *name,
const struct stat *stbuf, off_t off)
{
struct puffs_fuse_dirh *deh = buf;
ino_t dino;
uint8_t dtype;
if (stbuf == NULL) {
dtype = DT_UNKNOWN;
dino = fakeino++;
} else {
dtype = puffs_vtype2dt(puffs_mode2vt(stbuf->st_mode));
dino = stbuf->st_ino;
/*
* Some FUSE file systems like to always use 0 as the
* inode number. Our readdir() doesn't like to show
* directory entries with inode number 0 ==> workaround.
*/
if (dino == 0) {
dino = fakeino++;
}
}
return fill_dirbuf(deh, name, dino, dtype);
}
static int
puffs_fuse_dirfil(fuse_dirh_t h, const char *name, int type, ino_t ino)
{
ino_t dino;
int dtype;
if ((dtype = type) == 0) {
dtype = DT_UNKNOWN;
}
dino = (ino) ? ino : fakeino++;
return fill_dirbuf(h, name, dino, dtype);
}
/* place the refuse file system name into `name' */
static void
set_refuse_mount_name(char **argv, char *name, size_t size)
{
char *slash;
if (argv == NULL || *argv == NULL) {
(void) strlcpy(name, "refuse", size);
} else {
if ((slash = strrchr(*argv, '/')) == NULL) {
slash = *argv;
} else {
slash += 1;
}
if (strncmp(*argv, "refuse:", 7) == 0) {
/* we've already done this */
(void) strlcpy(name, *argv, size);
} else {
(void) snprintf(name, size, "refuse:%s", slash);
}
}
}
/* this function exposes struct fuse to userland */
static struct fuse *
fuse_setup_real(int argc, char **argv, const struct fuse_operations *ops,
size_t size, char **mountpoint, int *multithreaded, int *fd,
void *user_data)
{
struct fuse_chan *fc;
struct fuse_args *args;
struct fuse *fuse;
char name[64];
int i;
/* set up the proper name */
set_refuse_mount_name(argv, name, sizeof(name));
/* grab the pthread context key */
if (!create_context_key()) {
return NULL;
}
/* stuff name into fuse_args */
args = fuse_opt_deep_copy_args(argc, argv);
if (args->argc > 0) {
free(args->argv[0]);
}
if ((args->argv[0] = strdup(name)) == NULL) {
fuse_opt_free_args(args);
return NULL;
}
/* count back from the end over arguments starting with '-' */
for (i = argc - 1 ; i > 0 && *argv[i] == '-' ; --i) {
}
fc = fuse_mount(*mountpoint = argv[i], args);
fuse = fuse_new(fc, args, ops, size, user_data);
fuse_opt_free_args(args);
free(args);
/* XXX - wait for puffs to become multi-threaded */
if (multithreaded) {
*multithreaded = 0;
}
/* XXX - this is unused */
if (fd) {
*fd = 0;
}
return fuse;
}
#ifdef fuse_setup
#undef fuse_setup
#endif
struct fuse *
fuse_setup(int argc, char **argv, const struct fuse_operations *ops,
size_t size, char **mountpoint, int *multithreaded, int *fd)
{
return fuse_setup_real(argc, argv, ops, size, mountpoint,
multithreaded, fd, NULL);
}
struct fuse *
fuse_setup26(int argc, char **argv, const struct fuse_operations *ops,
size_t size, char **mountpoint, int *multithreaded, void *user_data)
{
return fuse_setup_real(argc, argv, ops, size, mountpoint,
multithreaded, NULL, user_data);
}
#define FUSE_ERR_UNLINK(fuse, file) if (fuse->op.unlink) fuse->op.unlink(file)
#define FUSE_ERR_RMDIR(fuse, dir) if (fuse->op.rmdir) fuse->op.rmdir(dir)
/* ARGSUSED1 */
static int
fuse_getattr(struct fuse *fuse, struct puffs_node *pn, const char *path,
struct vattr *va)
{
struct stat st;
int ret;
if (fuse->op.getattr == NULL) {
return ENOSYS;
}
/* wrap up return code */
memset(&st, 0, sizeof(st));
ret = (*fuse->op.getattr)(path, &st);
if (ret == 0) {
if (st.st_blksize == 0)
st.st_blksize = DEV_BSIZE;
puffs_stat2vattr(va, &st);
}
return -ret;
}
/* utility function to set various elements of the attribute */
static int
fuse_setattr(struct fuse *fuse, struct puffs_node *pn, const char *path,
const struct vattr *va)
{
struct refusenode *rn = pn->pn_data;
mode_t mode;
uid_t uid;
gid_t gid;
int error, ret;
error = 0;
mode = va->va_mode;
uid = va->va_uid;
gid = va->va_gid;
if (mode != (mode_t)PUFFS_VNOVAL) {
ret = 0;
if (fuse->op.chmod == NULL) {
error = -ENOSYS;
} else {
ret = fuse->op.chmod(path, mode);
if (ret)
error = ret;
}
}
if (uid != (uid_t)PUFFS_VNOVAL || gid != (gid_t)PUFFS_VNOVAL) {
ret = 0;
if (fuse->op.chown == NULL) {
error = -ENOSYS;
} else {
ret = fuse->op.chown(path, uid, gid);
if (ret)
error = ret;
}
}
if (va->va_atime.tv_sec != (time_t)PUFFS_VNOVAL
|| va->va_mtime.tv_sec != (long)PUFFS_VNOVAL) {
ret = 0;
if (fuse->op.utimens) {
struct timespec tv[2];
tv[0].tv_sec = va->va_atime.tv_sec;
tv[0].tv_nsec = va->va_atime.tv_nsec;
tv[1].tv_sec = va->va_mtime.tv_sec;
tv[1].tv_nsec = va->va_mtime.tv_nsec;
ret = fuse->op.utimens(path, tv);
} else if (fuse->op.utime) {
struct utimbuf timbuf;
timbuf.actime = va->va_atime.tv_sec;
timbuf.modtime = va->va_mtime.tv_sec;
ret = fuse->op.utime(path, &timbuf);
} else {
error = -ENOSYS;
}
if (ret)
error = ret;
}
if (va->va_size != (u_quad_t)PUFFS_VNOVAL) {
ret = 0;
if (fuse->op.truncate) {
ret = fuse->op.truncate(path, (off_t)va->va_size);
} else if (fuse->op.ftruncate) {
ret = fuse->op.ftruncate(path, (off_t)va->va_size,
&rn->file_info);
} else {
error = -ENOSYS;
}
if (ret)
error = ret;
}
/* XXX: no reflection with reality */
puffs_setvattr(&pn->pn_va, va);
return -error;
}
static int
fuse_newnode(struct puffs_usermount *pu, const char *path,
const struct vattr *va, struct fuse_file_info *fi,
struct puffs_newinfo *pni, struct puffs_node **pn_new)
{
struct puffs_node *pn;
struct refusenode *rn;
struct vattr newva;
struct fuse *fuse;
fuse = puffs_getspecific(pu);
/* fix up nodes */
pn = newrn(pu);
if (pn == NULL) {
if (va->va_type == VDIR) {
FUSE_ERR_RMDIR(fuse, path);
} else {
FUSE_ERR_UNLINK(fuse, path);
}
return ENOMEM;
}
fuse_setattr(fuse, pn, path, va);
if (fuse_getattr(fuse, pn, path, &newva) == 0)
puffs_setvattr(&pn->pn_va, &newva);
rn = pn->pn_data;
if (fi)
memcpy(&rn->file_info, fi, sizeof(struct fuse_file_info));
puffs_newinfo_setcookie(pni, pn);
if (pn_new)
*pn_new = pn;
return 0;
}
/* operation wrappers start here */
/* lookup the path */
/* ARGSUSED1 */
static int
puffs_fuse_node_lookup(struct puffs_usermount *pu, void *opc,
struct puffs_newinfo *pni, const struct puffs_cn *pcn)
{
struct puffs_node *pn_res;
struct stat st;
struct fuse *fuse;
const char *path = PCNPATH(pcn);
int ret;
fuse = puffs_getspecific(pu);
set_fuse_context_uid_gid(pcn->pcn_cred);
ret = fuse->op.getattr(path, &st);
if (ret != 0) {
return -ret;
}
/* XXX: fiXXXme unconst */
pn_res = puffs_pn_nodewalk(pu, puffs_path_walkcmp,
__UNCONST(&pcn->pcn_po_full));
if (pn_res == NULL) {
pn_res = newrn(pu);
if (pn_res == NULL)
return errno;
puffs_stat2vattr(&pn_res->pn_va, &st);
}
puffs_newinfo_setcookie(pni, pn_res);
puffs_newinfo_setvtype(pni, pn_res->pn_va.va_type);
puffs_newinfo_setsize(pni, (voff_t)pn_res->pn_va.va_size);
puffs_newinfo_setrdev(pni, pn_res->pn_va.va_rdev);
return 0;
}
/* get attributes for the path name */
/* ARGSUSED3 */
static int
puffs_fuse_node_getattr(struct puffs_usermount *pu, void *opc, struct vattr *va,
const struct puffs_cred *pcr)
{
struct puffs_node *pn = opc;
struct fuse *fuse;
const char *path = PNPATH(pn);
fuse = puffs_getspecific(pu);
set_fuse_context_uid_gid(pcr);
return fuse_getattr(fuse, pn, path, va);
}
/* read the contents of the symbolic link */
/* ARGSUSED2 */
static int
puffs_fuse_node_readlink(struct puffs_usermount *pu, void *opc,
const struct puffs_cred *cred, char *linkname, size_t *linklen)
{
struct puffs_node *pn = opc;
struct fuse *fuse;
const char *path = PNPATH(pn), *p;
int ret;
fuse = puffs_getspecific(pu);
if (fuse->op.readlink == NULL) {
return ENOSYS;
}
set_fuse_context_uid_gid(cred);
/* wrap up return code */
ret = (*fuse->op.readlink)(path, linkname, *linklen);
if (ret == 0) {
p = memchr(linkname, '\0', *linklen);
if (!p)
return EINVAL;
*linklen = p - linkname;
}
return -ret;
}
/* make the special node */
/* ARGSUSED1 */
static int
puffs_fuse_node_mknod(struct puffs_usermount *pu, void *opc,
struct puffs_newinfo *pni, const struct puffs_cn *pcn,
const struct vattr *va)
{
struct fuse *fuse;
mode_t mode;
const char *path = PCNPATH(pcn);
int ret;
fuse = puffs_getspecific(pu);
if (fuse->op.mknod == NULL) {
return ENOSYS;
}
set_fuse_context_uid_gid(pcn->pcn_cred);
/* wrap up return code */
mode = puffs_addvtype2mode(va->va_mode, va->va_type);
ret = (*fuse->op.mknod)(path, mode, va->va_rdev);
if (ret == 0) {
ret = fuse_newnode(pu, path, va, NULL, pni, NULL);
}
return -ret;
}
/* make a directory */
/* ARGSUSED1 */
static int
puffs_fuse_node_mkdir(struct puffs_usermount *pu, void *opc,
struct puffs_newinfo *pni, const struct puffs_cn *pcn,
const struct vattr *va)
{
struct fuse *fuse;
mode_t mode = va->va_mode;
const char *path = PCNPATH(pcn);
int ret;
fuse = puffs_getspecific(pu);
set_fuse_context_uid_gid(pcn->pcn_cred);
if (fuse->op.mkdir == NULL) {
return ENOSYS;
}
/* wrap up return code */
ret = (*fuse->op.mkdir)(path, mode);
if (ret == 0) {
ret = fuse_newnode(pu, path, va, NULL, pni, NULL);
}
return -ret;
}
/*
* create a regular file
*
* since linux/fuse sports using mknod for creating regular files
* instead of having a separate call for it in some versions, if
* we don't have create, just jump to op->mknod.
*/
/*ARGSUSED1*/
static int
puffs_fuse_node_create(struct puffs_usermount *pu, void *opc,
struct puffs_newinfo *pni, const struct puffs_cn *pcn,
const struct vattr *va)
{
struct fuse *fuse;
struct fuse_file_info fi;
struct puffs_node *pn;
mode_t mode = va->va_mode;
const char *path = PCNPATH(pcn);
int ret, created;
fuse = puffs_getspecific(pu);
set_fuse_context_uid_gid(pcn->pcn_cred);
created = 0;
if (fuse->op.create) {
ret = fuse->op.create(path, mode | S_IFREG, &fi);
if (ret == 0)
created = 1;
} else if (fuse->op.mknod) {
ret = fuse->op.mknod(path, mode | S_IFREG, 0);
} else {
ret = -ENOSYS;
}
if (ret == 0) {
ret = fuse_newnode(pu, path, va, &fi, pni, &pn);
/* sweet.. create also open the file */
if (created) {
struct refusenode *rn;
rn = pn->pn_data;
rn->flags |= RN_OPEN;
rn->opencount++;
}
}
return -ret;
}
/* remove the directory entry */
/* ARGSUSED1 */
static int
puffs_fuse_node_remove(struct puffs_usermount *pu, void *opc, void *targ,
const struct puffs_cn *pcn)
{
struct puffs_node *pn_targ = targ;
struct fuse *fuse;
const char *path = PNPATH(pn_targ);
int ret;
fuse = puffs_getspecific(pu);
set_fuse_context_uid_gid(pcn->pcn_cred);
if (fuse->op.unlink == NULL) {
return ENOSYS;
}
/* wrap up return code */
ret = (*fuse->op.unlink)(path);
return -ret;
}
/* remove the directory */
/* ARGSUSED1 */
static int
puffs_fuse_node_rmdir(struct puffs_usermount *pu, void *opc, void *targ,
const struct puffs_cn *pcn)
{
struct puffs_node *pn_targ = targ;
struct fuse *fuse;
const char *path = PNPATH(pn_targ);
int ret;
fuse = puffs_getspecific(pu);
set_fuse_context_uid_gid(pcn->pcn_cred);
if (fuse->op.rmdir == NULL) {
return ENOSYS;
}
/* wrap up return code */
ret = (*fuse->op.rmdir)(path);
return -ret;
}
/* create a symbolic link */
/* ARGSUSED1 */
static int
puffs_fuse_node_symlink(struct puffs_usermount *pu, void *opc,
struct puffs_newinfo *pni, const struct puffs_cn *pcn_src,
const struct vattr *va, const char *link_target)
{
struct fuse *fuse;
const char *path = PCNPATH(pcn_src);
int ret;
fuse = puffs_getspecific(pu);
set_fuse_context_uid_gid(pcn_src->pcn_cred);
if (fuse->op.symlink == NULL) {
return ENOSYS;
}
/* wrap up return code */
ret = fuse->op.symlink(link_target, path);
if (ret == 0) {
ret = fuse_newnode(pu, path, va, NULL, pni, NULL);
}
return -ret;
}
/* rename a directory entry */
/* ARGSUSED1 */
static int
puffs_fuse_node_rename(struct puffs_usermount *pu, void *opc, void *src,
const struct puffs_cn *pcn_src, void *targ_dir, void *targ,
const struct puffs_cn *pcn_targ)
{
struct fuse *fuse;
const char *path_src = PCNPATH(pcn_src);
const char *path_dest = PCNPATH(pcn_targ);
int ret;
fuse = puffs_getspecific(pu);
set_fuse_context_uid_gid(pcn_targ->pcn_cred);
if (fuse->op.rename == NULL) {
return ENOSYS;
}
ret = fuse->op.rename(path_src, path_dest);
if (ret == 0) {
}
return -ret;
}
/* create a link in the file system */
/* ARGSUSED1 */
static int
puffs_fuse_node_link(struct puffs_usermount *pu, void *opc, void *targ,
const struct puffs_cn *pcn)
{
struct puffs_node *pn = targ;
struct fuse *fuse;
int ret;
fuse = puffs_getspecific(pu);
set_fuse_context_uid_gid(pcn->pcn_cred);
if (fuse->op.link == NULL) {
return ENOSYS;
}
/* wrap up return code */
ret = (*fuse->op.link)(PNPATH(pn), PCNPATH(pcn));
return -ret;
}
/*
* fuse's regular interface provides chmod(), chown(), utimes()
* and truncate() + some variations, so try to fit the square block
* in the circle hole and the circle block .... something like that
*/
/* ARGSUSED3 */
static int
puffs_fuse_node_setattr(struct puffs_usermount *pu, void *opc,
const struct vattr *va, const struct puffs_cred *pcr)
{
struct puffs_node *pn = opc;
struct fuse *fuse;
const char *path = PNPATH(pn);
fuse = puffs_getspecific(pu);
set_fuse_context_uid_gid(pcr);
return fuse_setattr(fuse, pn, path, va);
}
/* ARGSUSED2 */
static int
puffs_fuse_node_open(struct puffs_usermount *pu, void *opc, int mode,
const struct puffs_cred *cred)
{
struct puffs_node *pn = opc;
struct refusenode *rn = pn->pn_data;
struct fuse_file_info *fi = &rn->file_info;
struct fuse *fuse;
const char *path = PNPATH(pn);
fuse = puffs_getspecific(pu);
set_fuse_context_uid_gid(cred);
/* if open, don't open again, lest risk nuking file private info */
if (rn->flags & RN_OPEN) {
rn->opencount++;
return 0;
}
/* OFLAGS(), need to convert FREAD/FWRITE to O_RD/WR */
fi->flags = (mode & ~(O_CREAT | O_EXCL | O_TRUNC)) - 1;
if (pn->pn_va.va_type == VDIR) {
if (fuse->op.opendir)
fuse->op.opendir(path, fi);
} else {
if (fuse->op.open)
fuse->op.open(path, fi);
}
rn->flags |= RN_OPEN;
rn->opencount++;
return 0;
}
/* ARGSUSED2 */
static int
puffs_fuse_node_close(struct puffs_usermount *pu, void *opc, int fflag,
const struct puffs_cred *pcr)
{
struct puffs_node *pn = opc;
struct refusenode *rn = pn->pn_data;
struct fuse *fuse;
struct fuse_file_info *fi;
const char *path = PNPATH(pn);
int ret;
fuse = puffs_getspecific(pu);
fi = &rn->file_info;
ret = 0;
set_fuse_context_uid_gid(pcr);
if (rn->flags & RN_OPEN) {
if (pn->pn_va.va_type == VDIR) {
if (fuse->op.releasedir)
ret = fuse->op.releasedir(path, fi);
} else {
if (fuse->op.release)
ret = fuse->op.release(path, fi);
}
}
rn->flags &= ~RN_OPEN;
rn->opencount--;
return ret;
}
/* read some more from the file */
/* ARGSUSED5 */
static int
puffs_fuse_node_read(struct puffs_usermount *pu, void *opc, uint8_t *buf,
off_t offset, size_t *resid, const struct puffs_cred *pcr,
int ioflag)
{
struct puffs_node *pn = opc;
struct refusenode *rn = pn->pn_data;
struct fuse *fuse;
const char *path = PNPATH(pn);
size_t maxread;
int ret;
fuse = puffs_getspecific(pu);
if (fuse->op.read == NULL) {
return ENOSYS;
}
set_fuse_context_uid_gid(pcr);
maxread = *resid;
if (maxread > pn->pn_va.va_size - offset) {
/*LINTED*/
maxread = pn->pn_va.va_size - offset;
}
if (maxread == 0)
return 0;
ret = (*fuse->op.read)(path, (char *)buf, maxread, offset,
&rn->file_info);
if (ret > 0) {
*resid -= ret;
ret = 0;
}
return -ret;
}
/* write to the file */
/* ARGSUSED0 */
static int
puffs_fuse_node_write(struct puffs_usermount *pu, void *opc, uint8_t *buf,
off_t offset, size_t *resid, const struct puffs_cred *pcr,
int ioflag)
{
struct puffs_node *pn = opc;
struct refusenode *rn = pn->pn_data;
struct fuse *fuse;
const char *path = PNPATH(pn);
int ret;
fuse = puffs_getspecific(pu);
if (fuse->op.write == NULL) {
return ENOSYS;
}
set_fuse_context_uid_gid(pcr);
if (ioflag & PUFFS_IO_APPEND)
offset = pn->pn_va.va_size;
ret = (*fuse->op.write)(path, (char *)buf, *resid, offset,
&rn->file_info);
if (ret > 0) {
if ((uint64_t)(offset + ret) > pn->pn_va.va_size)
pn->pn_va.va_size = offset + ret;
*resid -= ret;
ret = 0;
}
return -ret;
}
/* ARGSUSED3 */
static int
puffs_fuse_node_readdir(struct puffs_usermount *pu, void *opc,
struct dirent *dent, off_t *readoff, size_t *reslen,
const struct puffs_cred *pcr, int *eofflag,
off_t *cookies, size_t *ncookies)
{
struct puffs_node *pn = opc;
struct refusenode *rn = pn->pn_data;
struct puffs_fuse_dirh *dirh;
struct fuse *fuse;
struct dirent *fromdent;
const char *path = PNPATH(pn);
int ret;
fuse = puffs_getspecific(pu);
if (fuse->op.readdir == NULL && fuse->op.getdir == NULL) {
return ENOSYS;
}
set_fuse_context_uid_gid(pcr);
if (pn->pn_va.va_type != VDIR)
return ENOTDIR;
dirh = &rn->dirh;
/*
* if we are starting from the beginning, slurp entire directory
* into our buffers
*/
if (*readoff == 0) {
/* free old buffers */
free(dirh->dbuf);
memset(dirh, 0, sizeof(struct puffs_fuse_dirh));
if (fuse->op.readdir)
ret = fuse->op.readdir(path, dirh, puffs_fuse_fill_dir,
0, &rn->file_info);
else
ret = fuse->op.getdir(path, dirh, puffs_fuse_dirfil);
if (ret)
return -ret;
}
/* Both op.readdir and op.getdir read full directory */
*eofflag = 1;
/* now, stuff results into the kernel buffers */
while (*readoff < (off_t)(dirh->bufsize - dirh->reslen)) {
/*LINTED*/
fromdent = (struct dirent *)((uint8_t *)dirh->dbuf + *readoff);
if (*reslen < _DIRENT_SIZE(fromdent))
break;
memcpy(dent, fromdent, _DIRENT_SIZE(fromdent));
*readoff += _DIRENT_SIZE(fromdent);
*reslen -= _DIRENT_SIZE(fromdent);
dent = _DIRENT_NEXT(dent);
}
return 0;
}
/* ARGSUSED */
static int
puffs_fuse_node_reclaim(struct puffs_usermount *pu, void *opc)
{
struct puffs_node *pn = opc;
nukern(pn);
return 0;
}
/* ARGSUSED1 */
static int
puffs_fuse_fs_unmount(struct puffs_usermount *pu, int flags)
{
struct fuse *fuse;
fuse = puffs_getspecific(pu);
if (fuse->op.destroy == NULL) {
return 0;
}
(*fuse->op.destroy)(fuse);
return 0;
}
/* ARGSUSED0 */
static int
puffs_fuse_fs_sync(struct puffs_usermount *pu, int flags,
const struct puffs_cred *cr)
{
set_fuse_context_uid_gid(cr);
return 0;
}
/* ARGSUSED2 */
static int
puffs_fuse_fs_statvfs(struct puffs_usermount *pu, struct statvfs *svfsb)
{
struct fuse *fuse;
int ret;
fuse = puffs_getspecific(pu);
if (fuse->op.statfs == NULL) {
if ((ret = statvfs(PNPATH(puffs_getroot(pu)), svfsb)) == -1) {
return errno;
}
} else {
ret = fuse->op.statfs(PNPATH(puffs_getroot(pu)), svfsb);
}
return -ret;
}
/* End of puffs_fuse operations */
/* ARGSUSED3 */
int
fuse_main_real(int argc, char **argv, const struct fuse_operations *ops,
size_t size, void *userdata)
{
struct fuse *fuse;
char *mountpoint;
int multithreaded;
int fd;
fuse = fuse_setup(argc, argv, ops, size, &mountpoint, &multithreaded,
&fd);
return fuse_loop(fuse);
}
/*
* XXX: just defer the operation until fuse_new() when we have more
* info on our hands. The real beef is why's this separate in fuse in
* the first place?
*/
/* ARGSUSED1 */
struct fuse_chan *
fuse_mount(const char *dir, struct fuse_args *args)
{
struct fuse_chan *fc;
char name[64];
if ((fc = calloc(1, sizeof(*fc))) == NULL) {
err(EXIT_FAILURE, "fuse_mount");
}
fc->dead = 0;
if ((fc->dir = strdup(dir)) == NULL) {
err(EXIT_FAILURE, "fuse_mount");
}
/*
* we need to deep copy the args struct - some fuse file
* systems "clean up" the argument vector for "security
* reasons"
*/
fc->args = fuse_opt_deep_copy_args(args->argc, args->argv);
if (args->argc > 0) {
set_refuse_mount_name(args->argv, name, sizeof(name));
if ((args->argv[0] = strdup(name)) == NULL)
err(1, "fuse_mount");
}
return fc;
}
/* ARGSUSED1 */
struct fuse *
fuse_new(struct fuse_chan *fc, struct fuse_args *args,
const struct fuse_operations *ops, size_t size, void *userdata)
{
struct puffs_usermount *pu;
struct fuse_context *fusectx;
struct puffs_pathobj *po_root;
struct puffs_node *pn_root;
struct puffs_ops *pops;
struct refusenode *rn_root;
struct statvfs svfsb;
struct stat st;
struct fuse *fuse;
extern int puffs_fakecc;
char name[64];
char *argv0;
if ((fuse = calloc(1, sizeof(*fuse))) == NULL) {
err(EXIT_FAILURE, "fuse_new");
}
/* copy fuse ops to their own structure */
(void) memcpy(&fuse->op, ops, sizeof(fuse->op));
fusectx = fuse_get_context();
fusectx->fuse = fuse;
fusectx->uid = 0;
fusectx->gid = 0;
fusectx->pid = 0;
fusectx->private_data = userdata;
fuse->fc = fc;
/* initialise the puffs operations structure */
PUFFSOP_INIT(pops);
PUFFSOP_SET(pops, puffs_fuse, fs, sync);
PUFFSOP_SET(pops, puffs_fuse, fs, statvfs);
PUFFSOP_SET(pops, puffs_fuse, fs, unmount);
/*
* XXX: all of these don't possibly need to be
* unconditionally set
*/
PUFFSOP_SET(pops, puffs_fuse, node, lookup);
PUFFSOP_SET(pops, puffs_fuse, node, getattr);
PUFFSOP_SET(pops, puffs_fuse, node, setattr);
PUFFSOP_SET(pops, puffs_fuse, node, readdir);
PUFFSOP_SET(pops, puffs_fuse, node, readlink);
PUFFSOP_SET(pops, puffs_fuse, node, mknod);
PUFFSOP_SET(pops, puffs_fuse, node, create);
PUFFSOP_SET(pops, puffs_fuse, node, remove);
PUFFSOP_SET(pops, puffs_fuse, node, mkdir);
PUFFSOP_SET(pops, puffs_fuse, node, rmdir);
PUFFSOP_SET(pops, puffs_fuse, node, symlink);
PUFFSOP_SET(pops, puffs_fuse, node, rename);
PUFFSOP_SET(pops, puffs_fuse, node, link);
PUFFSOP_SET(pops, puffs_fuse, node, open);
PUFFSOP_SET(pops, puffs_fuse, node, close);
PUFFSOP_SET(pops, puffs_fuse, node, read);
PUFFSOP_SET(pops, puffs_fuse, node, write);
PUFFSOP_SET(pops, puffs_fuse, node, reclaim);
argv0 = (*args->argv[0] == 0x0) ? fc->args->argv[0] : args->argv[0];
set_refuse_mount_name(&argv0, name, sizeof(name));
puffs_fakecc = 1; /* XXX */
pu = puffs_init(pops, _PATH_PUFFS, name, fuse,
PUFFS_FLAG_BUILDPATH
| PUFFS_FLAG_HASHPATH
| PUFFS_KFLAG_NOCACHE);
if (pu == NULL) {
err(EXIT_FAILURE, "puffs_init");
}
fc->pu = pu;
pn_root = newrn(pu);
puffs_setroot(pu, pn_root);
rn_root = pn_root->pn_data;
rn_root->flags |= RN_ROOT;
po_root = puffs_getrootpathobj(pu);
if ((po_root->po_path = strdup("/")) == NULL)
err(1, "fuse_new");
po_root->po_len = 1;
puffs_path_buildhash(pu, po_root);
/* sane defaults */
puffs_vattr_null(&pn_root->pn_va);
pn_root->pn_va.va_type = VDIR;
pn_root->pn_va.va_mode = 0755;
if (fuse->op.getattr)
if (fuse->op.getattr(po_root->po_path, &st) == 0)
puffs_stat2vattr(&pn_root->pn_va, &st);
assert(pn_root->pn_va.va_type == VDIR);
if (fuse->op.init)
fusectx->private_data = fuse->op.init(NULL); /* XXX */
puffs_set_prepost(pu, set_fuse_context_pid, NULL);
puffs_zerostatvfs(&svfsb);
if (puffs_mount(pu, fc->dir, MNT_NODEV | MNT_NOSUID, pn_root) == -1) {
err(EXIT_FAILURE, "puffs_mount: directory \"%s\"", fc->dir);
}
return fuse;
}
int
fuse_loop(struct fuse *fuse)
{
return puffs_mainloop(fuse->fc->pu);
}
void
fuse_destroy(struct fuse *fuse)
{
/*
* TODO: needs to assert the fs is quiescent, i.e. no other
* threads exist
*/
delete_context_key();
/* XXXXXX: missing stuff */
free(fuse);
}
void
fuse_exit(struct fuse *fuse)
{
/* XXX: puffs_exit() is WRONG */
if (fuse->fc->dead == 0)
puffs_exit(fuse->fc->pu, 1);
fuse->fc->dead = 1;
}
/*
* XXX: obviously not the most perfect of functions, but needs some
* puffs tweaking for a better tomorrow
*/
/*ARGSUSED*/
void
fuse_unmount(const char *mp, struct fuse_chan *fc)
{
/* XXX: puffs_exit() is WRONG */
if (fc->dead == 0)
puffs_exit(fc->pu, 1);
fc->dead = 1;
}
/*ARGSUSED*/
void
fuse_unmount_compat22(const char *mp)
{
return;
}
/* The next function "exposes" struct fuse to userland. Not much
* that we can do about this, as we're conforming to a defined
* interface. */
void
fuse_teardown(struct fuse *fuse, char *mountpoint)
{
fuse_unmount(mountpoint, fuse->fc);
fuse_destroy(fuse);
}
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