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NetBSD/lib/librefuse/refuse.c

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/* $NetBSD: refuse.c,v 1.96 2012/12/30 10:04:22 tron 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 1.96 2012/12/30 10:04:22 tron Exp $");
#endif /* !lint */
#include <sys/types.h>
#include <assert.h>
#include <err.h>
#include <errno.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;
pthread_mutex_t lock;
pthread_rwlock_t tree_lock;
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 = (*resid == 0) ? 0 : ENOSPC;
} else {
ret = -ret;
}
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_real(argc, argv, ops, size, &mountpoint,
&multithreaded, &fd, userdata);
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;
if (fuse->op.init != NULL)
fusectx->private_data = fuse->op.init(NULL); /* XXX */
/* 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);
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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