fuse_lowlevel.c
/*
FUSE: Filesystem in Userspace
Copyright (C) 2001-2007 Miklos Szeredi <miklos@szeredi.hu>
Implementation of (most of) the low-level FUSE API. The session loop
functions are implemented in separate files.
This program can be distributed under the terms of the GNU LGPLv2.
See the file COPYING.LIB
*/
#define _GNU_SOURCE
#include "config.h"
#include "fuse_i.h"
#include "fuse_kernel.h"
#include "fuse_opt.h"
#include "fuse_misc.h"
#include "mount_util.h"
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#include <errno.h>
#include <assert.h>
#include <sys/file.h>
#ifndef F_LINUX_SPECIFIC_BASE
#define F_LINUX_SPECIFIC_BASE 1024
#endif
#ifndef F_SETPIPE_SZ
#define F_SETPIPE_SZ (F_LINUX_SPECIFIC_BASE + 7)
#endif
#define PARAM(inarg) (((char *)(inarg)) + sizeof(*(inarg)))
#define OFFSET_MAX 0x7fffffffffffffffLL
#define container_of(ptr, type, member) ({ \
const typeof( ((type *)0)->member ) *__mptr = (ptr); \
(type *)( (char *)__mptr - offsetof(type,member) );})
struct fuse_pollhandle {
uint64_t kh;
struct fuse_session *se;
};
static size_t pagesize;
static __attribute__((constructor)) void fuse_ll_init_pagesize(void)
{
pagesize = getpagesize();
}
static void convert_stat(const struct stat *stbuf, struct fuse_attr *attr)
{
attr->ino = stbuf->st_ino;
attr->mode = stbuf->st_mode;
attr->nlink = stbuf->st_nlink;
attr->uid = stbuf->st_uid;
attr->gid = stbuf->st_gid;
attr->rdev = stbuf->st_rdev;
attr->size = stbuf->st_size;
attr->blksize = stbuf->st_blksize;
attr->blocks = stbuf->st_blocks;
attr->atime = stbuf->st_atime;
attr->mtime = stbuf->st_mtime;
attr->ctime = stbuf->st_ctime;
attr->atimensec = ST_ATIM_NSEC(stbuf);
attr->mtimensec = ST_MTIM_NSEC(stbuf);
attr->ctimensec = ST_CTIM_NSEC(stbuf);
}
static void convert_attr(const struct fuse_setattr_in *attr, struct stat *stbuf)
{
stbuf->st_mode = attr->mode;
stbuf->st_uid = attr->uid;
stbuf->st_gid = attr->gid;
stbuf->st_size = attr->size;
stbuf->st_atime = attr->atime;
stbuf->st_mtime = attr->mtime;
stbuf->st_ctime = attr->ctime;
ST_ATIM_NSEC_SET(stbuf, attr->atimensec);
ST_MTIM_NSEC_SET(stbuf, attr->mtimensec);
ST_CTIM_NSEC_SET(stbuf, attr->ctimensec);
}
static size_t iov_length(const struct iovec *iov, size_t count)
{
size_t seg;
size_t ret = 0;
for (seg = 0; seg < count; seg++)
ret += iov[seg].iov_len;
return ret;
}
static void list_init_req(struct fuse_req *req)
{
req->next = req;
req->prev = req;
}
static void list_del_req(struct fuse_req *req)
{
struct fuse_req *prev = req->prev;
struct fuse_req *next = req->next;
prev->next = next;
next->prev = prev;
}
static void list_add_req(struct fuse_req *req, struct fuse_req *next)
{
struct fuse_req *prev = next->prev;
req->next = next;
req->prev = prev;
prev->next = req;
next->prev = req;
}
static void destroy_req(fuse_req_t req)
{
pthread_mutex_destroy(&req->lock);
free(req);
}
void fuse_free_req(fuse_req_t req)
{
int ctr;
struct fuse_session *se = req->se;
pthread_mutex_lock(&se->lock);
req->u.ni.func = NULL;
req->u.ni.data = NULL;
list_del_req(req);
ctr = --req->ctr;
fuse_chan_put(req->ch);
req->ch = NULL;
pthread_mutex_unlock(&se->lock);
if (!ctr)
destroy_req(req);
}
static struct fuse_req *fuse_ll_alloc_req(struct fuse_session *se)
{
struct fuse_req *req;
req = (struct fuse_req *) calloc(1, sizeof(struct fuse_req));
if (req == NULL) {
fprintf(stderr, "fuse: failed to allocate request\n");
} else {
req->se = se;
req->ctr = 1;
list_init_req(req);
fuse_mutex_init(&req->lock);
}
return req;
}
/* Send data. If *ch* is NULL, send via session master fd */
static int fuse_send_msg(struct fuse_session *se, struct fuse_chan *ch,
struct iovec *iov, int count)
{
struct fuse_out_header *out = iov[0].iov_base;
out->len = iov_length(iov, count);
if (se->debug) {
if (out->unique == 0) {
fprintf(stderr, "NOTIFY: code=%d length=%u\n",
out->error, out->len);
} else if (out->error) {
fprintf(stderr,
" unique: %llu, error: %i (%s), outsize: %i\n",
(unsigned long long) out->unique, out->error,
strerror(-out->error), out->len);
} else {
fprintf(stderr,
" unique: %llu, success, outsize: %i\n",
(unsigned long long) out->unique, out->len);
}
}
ssize_t res = writev(ch ? ch->fd : se->fd,
iov, count);
int err = errno;
if (res == -1) {
assert(se != NULL);
/* ENOENT means the operation was interrupted */
if (!fuse_session_exited(se) && err != ENOENT)
perror("fuse: writing device");
return -err;
}
return 0;
}
int fuse_send_reply_iov_nofree(fuse_req_t req, int error, struct iovec *iov,
int count)
{
struct fuse_out_header out;
if (error <= -1000 || error > 0) {
fprintf(stderr, "fuse: bad error value: %i\n", error);
error = -ERANGE;
}
out.unique = req->unique;
out.error = error;
iov[0].iov_base = &out;
iov[0].iov_len = sizeof(struct fuse_out_header);
return fuse_send_msg(req->se, req->ch, iov, count);
}
static int send_reply_iov(fuse_req_t req, int error, struct iovec *iov,
int count)
{
int res;
res = fuse_send_reply_iov_nofree(req, error, iov, count);
fuse_free_req(req);
return res;
}
static int send_reply(fuse_req_t req, int error, const void *arg,
size_t argsize)
{
struct iovec iov[2];
int count = 1;
if (argsize) {
iov[1].iov_base = (void *) arg;
iov[1].iov_len = argsize;
count++;
}
return send_reply_iov(req, error, iov, count);
}
int fuse_reply_iov(fuse_req_t req, const struct iovec *iov, int count)
{
int res;
struct iovec *padded_iov;
padded_iov = malloc((count + 1) * sizeof(struct iovec));
if (padded_iov == NULL)
return fuse_reply_err(req, ENOMEM);
memcpy(padded_iov + 1, iov, count * sizeof(struct iovec));
count++;
res = send_reply_iov(req, 0, padded_iov, count);
free(padded_iov);
return res;
}
/* `buf` is allowed to be empty so that the proper size may be
allocated by the caller */
size_t fuse_add_direntry(fuse_req_t req, char *buf, size_t bufsize,
const char *name, const struct stat *stbuf, off_t off)
{
(void)req;
size_t namelen;
size_t entlen;
size_t entlen_padded;
struct fuse_dirent *dirent;
namelen = strlen(name);
entlen = FUSE_NAME_OFFSET + namelen;
entlen_padded = FUSE_DIRENT_ALIGN(entlen);
if ((buf == NULL) || (entlen_padded > bufsize))
return entlen_padded;
dirent = (struct fuse_dirent*) buf;
dirent->ino = stbuf->st_ino;
dirent->off = off;
dirent->namelen = namelen;
dirent->type = (stbuf->st_mode & 0170000) >> 12;
strncpy(dirent->name, name, namelen);
memset(dirent->name + namelen, 0, entlen_padded - entlen);
return entlen_padded;
}
static void convert_statfs(const struct statvfs *stbuf,
struct fuse_kstatfs *kstatfs)
{
kstatfs->bsize = stbuf->f_bsize;
kstatfs->frsize = stbuf->f_frsize;
kstatfs->blocks = stbuf->f_blocks;
kstatfs->bfree = stbuf->f_bfree;
kstatfs->bavail = stbuf->f_bavail;
kstatfs->files = stbuf->f_files;
kstatfs->ffree = stbuf->f_ffree;
kstatfs->namelen = stbuf->f_namemax;
}
static int send_reply_ok(fuse_req_t req, const void *arg, size_t argsize)
{
return send_reply(req, 0, arg, argsize);
}
int fuse_reply_err(fuse_req_t req, int err)
{
return send_reply(req, -err, NULL, 0);
}
void fuse_reply_none(fuse_req_t req)
{
fuse_free_req(req);
}
static unsigned long calc_timeout_sec(double t)
{
if (t > (double) ULONG_MAX)
return ULONG_MAX;
else if (t < 0.0)
return 0;
else
return (unsigned long) t;
}
static unsigned int calc_timeout_nsec(double t)
{
double f = t - (double) calc_timeout_sec(t);
if (f < 0.0)
return 0;
else if (f >= 0.999999999)
return 999999999;
else
return (unsigned int) (f * 1.0e9);
}
static void fill_entry(struct fuse_entry_out *arg,
const struct fuse_entry_param *e)
{
arg->nodeid = e->ino;
arg->generation = e->generation;
arg->entry_valid = calc_timeout_sec(e->entry_timeout);
arg->entry_valid_nsec = calc_timeout_nsec(e->entry_timeout);
arg->attr_valid = calc_timeout_sec(e->attr_timeout);
arg->attr_valid_nsec = calc_timeout_nsec(e->attr_timeout);
convert_stat(&e->attr, &arg->attr);
}
/* `buf` is allowed to be empty so that the proper size may be
allocated by the caller */
size_t fuse_add_direntry_plus(fuse_req_t req, char *buf, size_t bufsize,
const char *name,
const struct fuse_entry_param *e, off_t off)
{
(void)req;
size_t namelen;
size_t entlen;
size_t entlen_padded;
namelen = strlen(name);
entlen = FUSE_NAME_OFFSET_DIRENTPLUS + namelen;
entlen_padded = FUSE_DIRENT_ALIGN(entlen);
if ((buf == NULL) || (entlen_padded > bufsize))
return entlen_padded;
struct fuse_direntplus *dp = (struct fuse_direntplus *) buf;
memset(&dp->entry_out, 0, sizeof(dp->entry_out));
fill_entry(&dp->entry_out, e);
struct fuse_dirent *dirent = &dp->dirent;
dirent->ino = e->attr.st_ino;
dirent->off = off;
dirent->namelen = namelen;
dirent->type = (e->attr.st_mode & 0170000) >> 12;
strncpy(dirent->name, name, namelen);
memset(dirent->name + namelen, 0, entlen_padded - entlen);
return entlen_padded;
}
static void fill_open(struct fuse_open_out *arg,
const struct fuse_file_info *f)
{
arg->fh = f->fh;
if (f->direct_io)
arg->open_flags |= FOPEN_DIRECT_IO;
if (f->keep_cache)
arg->open_flags |= FOPEN_KEEP_CACHE;
if (f->nonseekable)
arg->open_flags |= FOPEN_NONSEEKABLE;
}
int fuse_reply_entry(fuse_req_t req, const struct fuse_entry_param *e)
{
struct fuse_entry_out arg;
size_t size = req->se->conn.proto_minor < 9 ?
FUSE_COMPAT_ENTRY_OUT_SIZE : sizeof(arg);
/* before ABI 7.4 e->ino == 0 was invalid, only ENOENT meant
negative entry */
if (!e->ino && req->se->conn.proto_minor < 4)
return fuse_reply_err(req, ENOENT);
memset(&arg, 0, sizeof(arg));
fill_entry(&arg, e);
return send_reply_ok(req, &arg, size);
}
int fuse_reply_create(fuse_req_t req, const struct fuse_entry_param *e,
const struct fuse_file_info *f)
{
char buf[sizeof(struct fuse_entry_out) + sizeof(struct fuse_open_out)];
size_t entrysize = req->se->conn.proto_minor < 9 ?
FUSE_COMPAT_ENTRY_OUT_SIZE : sizeof(struct fuse_entry_out);
struct fuse_entry_out *earg = (struct fuse_entry_out *) buf;
struct fuse_open_out *oarg = (struct fuse_open_out *) (buf + entrysize);
memset(buf, 0, sizeof(buf));
fill_entry(earg, e);
fill_open(oarg, f);
return send_reply_ok(req, buf,
entrysize + sizeof(struct fuse_open_out));
}
int fuse_reply_attr(fuse_req_t req, const struct stat *attr,
double attr_timeout)
{
struct fuse_attr_out arg;
size_t size = req->se->conn.proto_minor < 9 ?
FUSE_COMPAT_ATTR_OUT_SIZE : sizeof(arg);
memset(&arg, 0, sizeof(arg));
arg.attr_valid = calc_timeout_sec(attr_timeout);
arg.attr_valid_nsec = calc_timeout_nsec(attr_timeout);
convert_stat(attr, &arg.attr);
return send_reply_ok(req, &arg, size);
}
int fuse_reply_readlink(fuse_req_t req, const char *linkname)
{
return send_reply_ok(req, linkname, strlen(linkname));
}
int fuse_reply_open(fuse_req_t req, const struct fuse_file_info *f)
{
struct fuse_open_out arg;
memset(&arg, 0, sizeof(arg));
fill_open(&arg, f);
return send_reply_ok(req, &arg, sizeof(arg));
}
int fuse_reply_write(fuse_req_t req, size_t count)
{
struct fuse_write_out arg;
memset(&arg, 0, sizeof(arg));
arg.size = count;
return send_reply_ok(req, &arg, sizeof(arg));
}
int fuse_reply_buf(fuse_req_t req, const char *buf, size_t size)
{
return send_reply_ok(req, buf, size);
}
static int fuse_send_data_iov_fallback(struct fuse_session *se,
struct fuse_chan *ch,
struct iovec *iov, int iov_count,
struct fuse_bufvec *buf,
size_t len)
{
struct fuse_bufvec mem_buf = FUSE_BUFVEC_INIT(len);
void *mbuf;
int res;
/* Optimize common case */
if (buf->count == 1 && buf->idx == 0 && buf->off == 0 &&
!(buf->buf[0].flags & FUSE_BUF_IS_FD)) {
/* FIXME: also avoid memory copy if there are multiple buffers
but none of them contain an fd */
iov[iov_count].iov_base = buf->buf[0].mem;
iov[iov_count].iov_len = len;
iov_count++;
return fuse_send_msg(se, ch, iov, iov_count);
}
res = posix_memalign(&mbuf, pagesize, len);
if (res != 0)
return res;
mem_buf.buf[0].mem = mbuf;
res = fuse_buf_copy(&mem_buf, buf, 0);
if (res < 0) {
free(mbuf);
return -res;
}
len = res;
iov[iov_count].iov_base = mbuf;
iov[iov_count].iov_len = len;
iov_count++;
res = fuse_send_msg(se, ch, iov, iov_count);
free(mbuf);
return res;
}
struct fuse_ll_pipe {
size_t size;
int can_grow;
int pipe[2];
};
static void fuse_ll_pipe_free(struct fuse_ll_pipe *llp)
{
close(llp->pipe[0]);
close(llp->pipe[1]);
free(llp);
}
#ifdef HAVE_SPLICE
#if !defined(HAVE_PIPE2) || !defined(O_CLOEXEC)
static int fuse_pipe(int fds[2])
{
int rv = pipe(fds);
if (rv == -1)
return rv;
if (fcntl(fds[0], F_SETFL, O_NONBLOCK) == -1 ||
fcntl(fds[1], F_SETFL, O_NONBLOCK) == -1 ||
fcntl(fds[0], F_SETFD, FD_CLOEXEC) == -1 ||
fcntl(fds[1], F_SETFD, FD_CLOEXEC) == -1) {
close(fds[0]);
close(fds[1]);
rv = -1;
}
return rv;
}
#else
static int fuse_pipe(int fds[2])
{
return pipe2(fds, O_CLOEXEC | O_NONBLOCK);
}
#endif
static struct fuse_ll_pipe *fuse_ll_get_pipe(struct fuse_session *se)
{
struct fuse_ll_pipe *llp = pthread_getspecific(se->pipe_key);
if (llp == NULL) {
int res;
llp = malloc(sizeof(struct fuse_ll_pipe));
if (llp == NULL)
return NULL;
res = fuse_pipe(llp->pipe);
if (res == -1) {
free(llp);
return NULL;
}
/*
*the default size is 16 pages on linux
*/
llp->size = pagesize * 16;
llp->can_grow = 1;
pthread_setspecific(se->pipe_key, llp);
}
return llp;
}
#endif
static void fuse_ll_clear_pipe(struct fuse_session *se)
{
struct fuse_ll_pipe *llp = pthread_getspecific(se->pipe_key);
if (llp) {
pthread_setspecific(se->pipe_key, NULL);
fuse_ll_pipe_free(llp);
}
}
#if defined(HAVE_SPLICE) && defined(HAVE_VMSPLICE)
static int read_back(int fd, char *buf, size_t len)
{
int res;
res = read(fd, buf, len);
if (res == -1) {
fprintf(stderr, "fuse: internal error: failed to read back from pipe: %s\n", strerror(errno));
return -EIO;
}
if (res != len) {
fprintf(stderr, "fuse: internal error: short read back from pipe: %i from %zi\n", res, len);
return -EIO;
}
return 0;
}
static int fuse_send_data_iov(struct fuse_session *se, struct fuse_chan *ch,
struct iovec *iov, int iov_count,
struct fuse_bufvec *buf, unsigned int flags)
{
int res;
size_t len = fuse_buf_size(buf);
struct fuse_out_header *out = iov[0].iov_base;
struct fuse_ll_pipe *llp;
int splice_flags;
size_t pipesize;
size_t total_fd_size;
size_t idx;
size_t headerlen;
struct fuse_bufvec pipe_buf = FUSE_BUFVEC_INIT(len);
if (se->broken_splice_nonblock)
goto fallback;
if (flags & FUSE_BUF_NO_SPLICE)
goto fallback;
total_fd_size = 0;
for (idx = buf->idx; idx < buf->count; idx++) {
if (buf->buf[idx].flags & FUSE_BUF_IS_FD) {
total_fd_size = buf->buf[idx].size;
if (idx == buf->idx)
total_fd_size -= buf->off;
}
}
if (total_fd_size < 2 * pagesize)
goto fallback;
if (se->conn.proto_minor < 14 ||
!(se->conn.want & FUSE_CAP_SPLICE_WRITE))
goto fallback;
llp = fuse_ll_get_pipe(se);
if (llp == NULL)
goto fallback;
headerlen = iov_length(iov, iov_count);
out->len = headerlen + len;
/*
* Heuristic for the required pipe size, does not work if the
* source contains less than page size fragments
*/
pipesize = pagesize * (iov_count + buf->count + 1) + out->len;
if (llp->size < pipesize) {
if (llp->can_grow) {
res = fcntl(llp->pipe[0], F_SETPIPE_SZ, pipesize);
if (res == -1) {
llp->can_grow = 0;
goto fallback;
}
llp->size = res;
}
if (llp->size < pipesize)
goto fallback;
}
res = vmsplice(llp->pipe[1], iov, iov_count, SPLICE_F_NONBLOCK);
if (res == -1)
goto fallback;
if (res != headerlen) {
res = -EIO;
fprintf(stderr, "fuse: short vmsplice to pipe: %u/%zu\n", res,
headerlen);
goto clear_pipe;
}
pipe_buf.buf[0].flags = FUSE_BUF_IS_FD;
pipe_buf.buf[0].fd = llp->pipe[1];
res = fuse_buf_copy(&pipe_buf, buf,
FUSE_BUF_FORCE_SPLICE | FUSE_BUF_SPLICE_NONBLOCK);
if (res < 0) {
if (res == -EAGAIN || res == -EINVAL) {
/*
* Should only get EAGAIN on kernels with
* broken SPLICE_F_NONBLOCK support (<=
* 2.6.35) where this error or a short read is
* returned even if the pipe itself is not
* full
*
* EINVAL might mean that splice can't handle
* this combination of input and output.
*/
if (res == -EAGAIN)
se->broken_splice_nonblock = 1;
pthread_setspecific(se->pipe_key, NULL);
fuse_ll_pipe_free(llp);
goto fallback;
}
res = -res;
goto clear_pipe;
}
if (res != 0 && res < len) {
struct fuse_bufvec mem_buf = FUSE_BUFVEC_INIT(len);
void *mbuf;
size_t now_len = res;
/*
* For regular files a short count is either
* 1) due to EOF, or
* 2) because of broken SPLICE_F_NONBLOCK (see above)
*
* For other inputs it's possible that we overflowed
* the pipe because of small buffer fragments.
*/
res = posix_memalign(&mbuf, pagesize, len);
if (res != 0)
goto clear_pipe;
mem_buf.buf[0].mem = mbuf;
mem_buf.off = now_len;
res = fuse_buf_copy(&mem_buf, buf, 0);
if (res > 0) {
char *tmpbuf;
size_t extra_len = res;
/*
* Trickiest case: got more data. Need to get
* back the data from the pipe and then fall
* back to regular write.
*/
tmpbuf = malloc(headerlen);
if (tmpbuf == NULL) {
free(mbuf);
res = ENOMEM;
goto clear_pipe;
}
res = read_back(llp->pipe[0], tmpbuf, headerlen);
free(tmpbuf);
if (res != 0) {
free(mbuf);
goto clear_pipe;
}
res = read_back(llp->pipe[0], mbuf, now_len);
if (res != 0) {
free(mbuf);
goto clear_pipe;
}
len = now_len + extra_len;
iov[iov_count].iov_base = mbuf;
iov[iov_count].iov_len = len;
iov_count++;
res = fuse_send_msg(se, ch, iov, iov_count);
free(mbuf);
return res;
}
free(mbuf);
res = now_len;
}
len = res;
out->len = headerlen + len;
if (se->debug) {
fprintf(stderr,
" unique: %llu, success, outsize: %i (splice)\n",
(unsigned long long) out->unique, out->len);
}
splice_flags = 0;
if ((flags & FUSE_BUF_SPLICE_MOVE) &&
(se->conn.want & FUSE_CAP_SPLICE_MOVE))
splice_flags |= SPLICE_F_MOVE;
res = splice(llp->pipe[0], NULL, ch ? ch->fd : se->fd,
NULL, out->len, splice_flags);
if (res == -1) {
res = -errno;
perror("fuse: splice from pipe");
goto clear_pipe;
}
if (res != out->len) {
res = -EIO;
fprintf(stderr, "fuse: short splice from pipe: %u/%u\n",
res, out->len);
goto clear_pipe;
}
return 0;
clear_pipe:
fuse_ll_clear_pipe(se);
return res;
fallback:
return fuse_send_data_iov_fallback(se, ch, iov, iov_count, buf, len);
}
#else
static int fuse_send_data_iov(struct fuse_session *se, struct fuse_chan *ch,
struct iovec *iov, int iov_count,
struct fuse_bufvec *buf, unsigned int flags)
{
size_t len = fuse_buf_size(buf);
(void) flags;
return fuse_send_data_iov_fallback(se, ch, iov, iov_count, buf, len);
}
#endif
int fuse_reply_data(fuse_req_t req, struct fuse_bufvec *bufv,
enum fuse_buf_copy_flags flags)
{
struct iovec iov[2];
struct fuse_out_header out;
int res;
iov[0].iov_base = &out;
iov[0].iov_len = sizeof(struct fuse_out_header);
out.unique = req->unique;
out.error = 0;
res = fuse_send_data_iov(req->se, req->ch, iov, 1, bufv, flags);
if (res <= 0) {
fuse_free_req(req);
return res;
} else {
return fuse_reply_err(req, res);
}
}
int fuse_reply_statfs(fuse_req_t req, const struct statvfs *stbuf)
{
struct fuse_statfs_out arg;
size_t size = req->se->conn.proto_minor < 4 ?
FUSE_COMPAT_STATFS_SIZE : sizeof(arg);
memset(&arg, 0, sizeof(arg));
convert_statfs(stbuf, &arg.st);
return send_reply_ok(req, &arg, size);
}
int fuse_reply_xattr(fuse_req_t req, size_t count)
{
struct fuse_getxattr_out arg;
memset(&arg, 0, sizeof(arg));
arg.size = count;
return send_reply_ok(req, &arg, sizeof(arg));
}
int fuse_reply_lock(fuse_req_t req, const struct flock *lock)
{
struct fuse_lk_out arg;
memset(&arg, 0, sizeof(arg));
arg.lk.type = lock->l_type;
if (lock->l_type != F_UNLCK) {
arg.lk.start = lock->l_start;
if (lock->l_len == 0)
arg.lk.end = OFFSET_MAX;
else
arg.lk.end = lock->l_start + lock->l_len - 1;
}
arg.lk.pid = lock->l_pid;
return send_reply_ok(req, &arg, sizeof(arg));
}
int fuse_reply_bmap(fuse_req_t req, uint64_t idx)
{
struct fuse_bmap_out arg;
memset(&arg, 0, sizeof(arg));
arg.block = idx;
return send_reply_ok(req, &arg, sizeof(arg));
}
static struct fuse_ioctl_iovec *fuse_ioctl_iovec_copy(const struct iovec *iov,
size_t count)
{
struct fuse_ioctl_iovec *fiov;
size_t i;
fiov = malloc(sizeof(fiov[0]) * count);
if (!fiov)
return NULL;
for (i = 0; i < count; i++) {
fiov[i].base = (uintptr_t) iov[i].iov_base;
fiov[i].len = iov[i].iov_len;
}
return fiov;
}
int fuse_reply_ioctl_retry(fuse_req_t req,
const struct iovec *in_iov, size_t in_count,
const struct iovec *out_iov, size_t out_count)
{
struct fuse_ioctl_out arg;
struct fuse_ioctl_iovec *in_fiov = NULL;
struct fuse_ioctl_iovec *out_fiov = NULL;
struct iovec iov[4];
size_t count = 1;
int res;
memset(&arg, 0, sizeof(arg));
arg.flags |= FUSE_IOCTL_RETRY;
arg.in_iovs = in_count;
arg.out_iovs = out_count;
iov[count].iov_base = &arg;
iov[count].iov_len = sizeof(arg);
count++;
if (req->se->conn.proto_minor < 16) {
if (in_count) {
iov[count].iov_base = (void *)in_iov;
iov[count].iov_len = sizeof(in_iov[0]) * in_count;
count++;
}
if (out_count) {
iov[count].iov_base = (void *)out_iov;
iov[count].iov_len = sizeof(out_iov[0]) * out_count;
count++;
}
} else {
/* Can't handle non-compat 64bit ioctls on 32bit */
if (sizeof(void *) == 4 && req->ioctl_64bit) {
res = fuse_reply_err(req, EINVAL);
goto out;
}
if (in_count) {
in_fiov = fuse_ioctl_iovec_copy(in_iov, in_count);
if (!in_fiov)
goto enomem;
iov[count].iov_base = (void *)in_fiov;
iov[count].iov_len = sizeof(in_fiov[0]) * in_count;
count++;
}
if (out_count) {
out_fiov = fuse_ioctl_iovec_copy(out_iov, out_count);
if (!out_fiov)
goto enomem;
iov[count].iov_base = (void *)out_fiov;
iov[count].iov_len = sizeof(out_fiov[0]) * out_count;
count++;
}
}
res = send_reply_iov(req, 0, iov, count);
out:
free(in_fiov);
free(out_fiov);
return res;
enomem:
res = fuse_reply_err(req, ENOMEM);
goto out;
}
int fuse_reply_ioctl(fuse_req_t req, int result, const void *buf, size_t size)
{
struct fuse_ioctl_out arg;
struct iovec iov[3];
size_t count = 1;
memset(&arg, 0, sizeof(arg));
arg.result = result;
iov[count].iov_base = &arg;
iov[count].iov_len = sizeof(arg);
count++;
if (size) {
iov[count].iov_base = (char *) buf;
iov[count].iov_len = size;
count++;
}
return send_reply_iov(req, 0, iov, count);
}
int fuse_reply_ioctl_iov(fuse_req_t req, int result, const struct iovec *iov,
int count)
{
struct iovec *padded_iov;
struct fuse_ioctl_out arg;
int res;
padded_iov = malloc((count + 2) * sizeof(struct iovec));
if (padded_iov == NULL)
return fuse_reply_err(req, ENOMEM);
memset(&arg, 0, sizeof(arg));
arg.result = result;
padded_iov[1].iov_base = &arg;
padded_iov[1].iov_len = sizeof(arg);
memcpy(&padded_iov[2], iov, count * sizeof(struct iovec));
res = send_reply_iov(req, 0, padded_iov, count + 2);
free(padded_iov);
return res;
}
int fuse_reply_poll(fuse_req_t req, unsigned revents)
{
struct fuse_poll_out arg;
memset(&arg, 0, sizeof(arg));
arg.revents = revents;
return send_reply_ok(req, &arg, sizeof(arg));
}
static void do_lookup(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
char *name = (char *) inarg;
if (req->se->op.lookup)
req->se->op.lookup(req, nodeid, name);
else
fuse_reply_err(req, ENOSYS);
}
static void do_forget(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
struct fuse_forget_in *arg = (struct fuse_forget_in *) inarg;
if (req->se->op.forget)
req->se->op.forget(req, nodeid, arg->nlookup);
else
fuse_reply_none(req);
}
static void do_batch_forget(fuse_req_t req, fuse_ino_t nodeid,
const void *inarg)
{
struct fuse_batch_forget_in *arg = (void *) inarg;
struct fuse_forget_one *param = (void *) PARAM(arg);
unsigned int i;
(void) nodeid;
if (req->se->op.forget_multi) {
req->se->op.forget_multi(req, arg->count,
(struct fuse_forget_data *) param);
} else if (req->se->op.forget) {
for (i = 0; i < arg->count; i++) {
struct fuse_forget_one *forget = &param[i];
struct fuse_req *dummy_req;
dummy_req = fuse_ll_alloc_req(req->se);
if (dummy_req == NULL)
break;
dummy_req->unique = req->unique;
dummy_req->ctx = req->ctx;
dummy_req->ch = NULL;
req->se->op.forget(dummy_req, forget->nodeid,
forget->nlookup);
}
fuse_reply_none(req);
} else {
fuse_reply_none(req);
}
}
static void do_getattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
struct fuse_file_info *fip = NULL;
struct fuse_file_info fi;
if (req->se->conn.proto_minor >= 9) {
struct fuse_getattr_in *arg = (struct fuse_getattr_in *) inarg;
if (arg->getattr_flags & FUSE_GETATTR_FH) {
memset(&fi, 0, sizeof(fi));
fi.fh = arg->fh;
fip = &fi;
}
}
if (req->se->op.getattr)
req->se->op.getattr(req, nodeid, fip);
else
fuse_reply_err(req, ENOSYS);
}
static void do_setattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
struct fuse_setattr_in *arg = (struct fuse_setattr_in *) inarg;
if (req->se->op.setattr) {
struct fuse_file_info *fi = NULL;
struct fuse_file_info fi_store;
struct stat stbuf;
memset(&stbuf, 0, sizeof(stbuf));
convert_attr(arg, &stbuf);
if (arg->valid & FATTR_FH) {
arg->valid &= ~FATTR_FH;
memset(&fi_store, 0, sizeof(fi_store));
fi = &fi_store;
fi->fh = arg->fh;
}
arg->valid &=
FUSE_SET_ATTR_MODE |
FUSE_SET_ATTR_UID |
FUSE_SET_ATTR_GID |
FUSE_SET_ATTR_SIZE |
FUSE_SET_ATTR_ATIME |
FUSE_SET_ATTR_MTIME |
FUSE_SET_ATTR_ATIME_NOW |
FUSE_SET_ATTR_MTIME_NOW |
FUSE_SET_ATTR_CTIME;
req->se->op.setattr(req, nodeid, &stbuf, arg->valid, fi);
} else
fuse_reply_err(req, ENOSYS);
}
static void do_access(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
struct fuse_access_in *arg = (struct fuse_access_in *) inarg;
if (req->se->op.access)
req->se->op.access(req, nodeid, arg->mask);
else
fuse_reply_err(req, ENOSYS);
}
static void do_readlink(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
(void) inarg;
if (req->se->op.readlink)
req->se->op.readlink(req, nodeid);
else
fuse_reply_err(req, ENOSYS);
}
static void do_mknod(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
struct fuse_mknod_in *arg = (struct fuse_mknod_in *) inarg;
char *name = PARAM(arg);
if (req->se->conn.proto_minor >= 12)
req->ctx.umask = arg->umask;
else
name = (char *) inarg + FUSE_COMPAT_MKNOD_IN_SIZE;
if (req->se->op.mknod)
req->se->op.mknod(req, nodeid, name, arg->mode, arg->rdev);
else
fuse_reply_err(req, ENOSYS);
}
static void do_mkdir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
struct fuse_mkdir_in *arg = (struct fuse_mkdir_in *) inarg;
if (req->se->conn.proto_minor >= 12)
req->ctx.umask = arg->umask;
if (req->se->op.mkdir)
req->se->op.mkdir(req, nodeid, PARAM(arg), arg->mode);
else
fuse_reply_err(req, ENOSYS);
}
static void do_unlink(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
char *name = (char *) inarg;
if (req->se->op.unlink)
req->se->op.unlink(req, nodeid, name);
else
fuse_reply_err(req, ENOSYS);
}
static void do_rmdir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
char *name = (char *) inarg;
if (req->se->op.rmdir)
req->se->op.rmdir(req, nodeid, name);
else
fuse_reply_err(req, ENOSYS);
}
static void do_symlink(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
char *name = (char *) inarg;
char *linkname = ((char *) inarg) + strlen((char *) inarg) + 1;
if (req->se->op.symlink)
req->se->op.symlink(req, linkname, nodeid, name);
else
fuse_reply_err(req, ENOSYS);
}
static void do_rename(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
struct fuse_rename_in *arg = (struct fuse_rename_in *) inarg;
char *oldname = PARAM(arg);
char *newname = oldname + strlen(oldname) + 1;
if (req->se->op.rename)
req->se->op.rename(req, nodeid, oldname, arg->newdir, newname,
0);
else
fuse_reply_err(req, ENOSYS);
}
static void do_rename2(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
struct fuse_rename2_in *arg = (struct fuse_rename2_in *) inarg;
char *oldname = PARAM(arg);
char *newname = oldname + strlen(oldname) + 1;
if (req->se->op.rename)
req->se->op.rename(req, nodeid, oldname, arg->newdir, newname,
arg->flags);
else
fuse_reply_err(req, ENOSYS);
}
static void do_link(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
struct fuse_link_in *arg = (struct fuse_link_in *) inarg;
if (req->se->op.link)
req->se->op.link(req, arg->oldnodeid, nodeid, PARAM(arg));
else
fuse_reply_err(req, ENOSYS);
}
static void do_create(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
struct fuse_create_in *arg = (struct fuse_create_in *) inarg;
if (req->se->op.create) {
struct fuse_file_info fi;
char *name = PARAM(arg);
memset(&fi, 0, sizeof(fi));
fi.flags = arg->flags;
if (req->se->conn.proto_minor >= 12)
req->ctx.umask = arg->umask;
else
name = (char *) inarg + sizeof(struct fuse_open_in);
req->se->op.create(req, nodeid, name, arg->mode, &fi);
} else
fuse_reply_err(req, ENOSYS);
}
static void do_open(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
struct fuse_open_in *arg = (struct fuse_open_in *) inarg;
struct fuse_file_info fi;
memset(&fi, 0, sizeof(fi));
fi.flags = arg->flags;
if (req->se->op.open)
req->se->op.open(req, nodeid, &fi);
else
fuse_reply_open(req, &fi);
}
static void do_read(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
struct fuse_read_in *arg = (struct fuse_read_in *) inarg;
if (req->se->op.read) {
struct fuse_file_info fi;
memset(&fi, 0, sizeof(fi));
fi.fh = arg->fh;
if (req->se->conn.proto_minor >= 9) {
fi.lock_owner = arg->lock_owner;
fi.flags = arg->flags;
}
req->se->op.read(req, nodeid, arg->size, arg->offset, &fi);
} else
fuse_reply_err(req, ENOSYS);
}
static void do_write(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
struct fuse_write_in *arg = (struct fuse_write_in *) inarg;
struct fuse_file_info fi;
char *param;
memset(&fi, 0, sizeof(fi));
fi.fh = arg->fh;
fi.writepage = (arg->write_flags & 1) != 0;
if (req->se->conn.proto_minor < 9) {
param = ((char *) arg) + FUSE_COMPAT_WRITE_IN_SIZE;
} else {
fi.lock_owner = arg->lock_owner;
fi.flags = arg->flags;
param = PARAM(arg);
}
if (req->se->op.write)
req->se->op.write(req, nodeid, param, arg->size,
arg->offset, &fi);
else
fuse_reply_err(req, ENOSYS);
}
static void do_write_buf(fuse_req_t req, fuse_ino_t nodeid, const void *inarg,
const struct fuse_buf *ibuf)
{
struct fuse_session *se = req->se;
struct fuse_bufvec bufv = {
.buf[0] = *ibuf,
.count = 1,
};
struct fuse_write_in *arg = (struct fuse_write_in *) inarg;
struct fuse_file_info fi;
memset(&fi, 0, sizeof(fi));
fi.fh = arg->fh;
fi.writepage = arg->write_flags & 1;
if (se->conn.proto_minor < 9) {
bufv.buf[0].mem = ((char *) arg) + FUSE_COMPAT_WRITE_IN_SIZE;
bufv.buf[0].size -= sizeof(struct fuse_in_header) +
FUSE_COMPAT_WRITE_IN_SIZE;
assert(!(bufv.buf[0].flags & FUSE_BUF_IS_FD));
} else {
fi.lock_owner = arg->lock_owner;
fi.flags = arg->flags;
if (!(bufv.buf[0].flags & FUSE_BUF_IS_FD))
bufv.buf[0].mem = PARAM(arg);
bufv.buf[0].size -= sizeof(struct fuse_in_header) +
sizeof(struct fuse_write_in);
}
if (bufv.buf[0].size < arg->size) {
fprintf(stderr, "fuse: do_write_buf: buffer size too small\n");
fuse_reply_err(req, EIO);
goto out;
}
bufv.buf[0].size = arg->size;
se->op.write_buf(req, nodeid, &bufv, arg->offset, &fi);
out:
/* Need to reset the pipe if ->write_buf() didn't consume all data */
if ((ibuf->flags & FUSE_BUF_IS_FD) && bufv.idx < bufv.count)
fuse_ll_clear_pipe(se);
}
static void do_flush(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
struct fuse_flush_in *arg = (struct fuse_flush_in *) inarg;
struct fuse_file_info fi;
memset(&fi, 0, sizeof(fi));
fi.fh = arg->fh;
fi.flush = 1;
if (req->se->conn.proto_minor >= 7)
fi.lock_owner = arg->lock_owner;
if (req->se->op.flush)
req->se->op.flush(req, nodeid, &fi);
else
fuse_reply_err(req, ENOSYS);
}
static void do_release(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
struct fuse_release_in *arg = (struct fuse_release_in *) inarg;
struct fuse_file_info fi;
memset(&fi, 0, sizeof(fi));
fi.flags = arg->flags;
fi.fh = arg->fh;
if (req->se->conn.proto_minor >= 8) {
fi.flush = (arg->release_flags & FUSE_RELEASE_FLUSH) ? 1 : 0;
fi.lock_owner = arg->lock_owner;
}
if (arg->release_flags & FUSE_RELEASE_FLOCK_UNLOCK) {
fi.flock_release = 1;
fi.lock_owner = arg->lock_owner;
}
if (req->se->op.release)
req->se->op.release(req, nodeid, &fi);
else
fuse_reply_err(req, 0);
}
static void do_fsync(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
struct fuse_fsync_in *arg = (struct fuse_fsync_in *) inarg;
struct fuse_file_info fi;
memset(&fi, 0, sizeof(fi));
fi.fh = arg->fh;
if (req->se->op.fsync)
req->se->op.fsync(req, nodeid, arg->fsync_flags & 1, &fi);
else
fuse_reply_err(req, ENOSYS);
}
static void do_opendir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
struct fuse_open_in *arg = (struct fuse_open_in *) inarg;
struct fuse_file_info fi;
memset(&fi, 0, sizeof(fi));
fi.flags = arg->flags;
if (req->se->op.opendir)
req->se->op.opendir(req, nodeid, &fi);
else
fuse_reply_open(req, &fi);
}
static void do_readdir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
struct fuse_read_in *arg = (struct fuse_read_in *) inarg;
struct fuse_file_info fi;
memset(&fi, 0, sizeof(fi));
fi.fh = arg->fh;
if (req->se->op.readdir)
req->se->op.readdir(req, nodeid, arg->size, arg->offset, &fi);
else
fuse_reply_err(req, ENOSYS);
}
static void do_readdirplus(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
struct fuse_read_in *arg = (struct fuse_read_in *) inarg;
struct fuse_file_info fi;
memset(&fi, 0, sizeof(fi));
fi.fh = arg->fh;
if (req->se->op.readdirplus)
req->se->op.readdirplus(req, nodeid, arg->size, arg->offset, &fi);
else
fuse_reply_err(req, ENOSYS);
}
static void do_releasedir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
struct fuse_release_in *arg = (struct fuse_release_in *) inarg;
struct fuse_file_info fi;
memset(&fi, 0, sizeof(fi));
fi.flags = arg->flags;
fi.fh = arg->fh;
if (req->se->op.releasedir)
req->se->op.releasedir(req, nodeid, &fi);
else
fuse_reply_err(req, 0);
}
static void do_fsyncdir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
struct fuse_fsync_in *arg = (struct fuse_fsync_in *) inarg;
struct fuse_file_info fi;
memset(&fi, 0, sizeof(fi));
fi.fh = arg->fh;
if (req->se->op.fsyncdir)
req->se->op.fsyncdir(req, nodeid, arg->fsync_flags & 1, &fi);
else
fuse_reply_err(req, ENOSYS);
}
static void do_statfs(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
(void) nodeid;
(void) inarg;
if (req->se->op.statfs)
req->se->op.statfs(req, nodeid);
else {
struct statvfs buf = {
.f_namemax = 255,
.f_bsize = 512,
};
fuse_reply_statfs(req, &buf);
}
}
static void do_setxattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
struct fuse_setxattr_in *arg = (struct fuse_setxattr_in *) inarg;
char *name = PARAM(arg);
char *value = name + strlen(name) + 1;
if (req->se->op.setxattr)
req->se->op.setxattr(req, nodeid, name, value, arg->size,
arg->flags);
else
fuse_reply_err(req, ENOSYS);
}
static void do_getxattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
struct fuse_getxattr_in *arg = (struct fuse_getxattr_in *) inarg;
if (req->se->op.getxattr)
req->se->op.getxattr(req, nodeid, PARAM(arg), arg->size);
else
fuse_reply_err(req, ENOSYS);
}
static void do_listxattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
struct fuse_getxattr_in *arg = (struct fuse_getxattr_in *) inarg;
if (req->se->op.listxattr)
req->se->op.listxattr(req, nodeid, arg->size);
else
fuse_reply_err(req, ENOSYS);
}
static void do_removexattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
char *name = (char *) inarg;
if (req->se->op.removexattr)
req->se->op.removexattr(req, nodeid, name);
else
fuse_reply_err(req, ENOSYS);
}
static void convert_fuse_file_lock(struct fuse_file_lock *fl,
struct flock *flock)
{
memset(flock, 0, sizeof(struct flock));
flock->l_type = fl->type;
flock->l_whence = SEEK_SET;
flock->l_start = fl->start;
if (fl->end == OFFSET_MAX)
flock->l_len = 0;
else
flock->l_len = fl->end - fl->start + 1;
flock->l_pid = fl->pid;
}
static void do_getlk(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
struct fuse_lk_in *arg = (struct fuse_lk_in *) inarg;
struct fuse_file_info fi;
struct flock flock;
memset(&fi, 0, sizeof(fi));
fi.fh = arg->fh;
fi.lock_owner = arg->owner;
convert_fuse_file_lock(&arg->lk, &flock);
if (req->se->op.getlk)
req->se->op.getlk(req, nodeid, &fi, &flock);
else
fuse_reply_err(req, ENOSYS);
}
static void do_setlk_common(fuse_req_t req, fuse_ino_t nodeid,
const void *inarg, int sleep)
{
struct fuse_lk_in *arg = (struct fuse_lk_in *) inarg;
struct fuse_file_info fi;
struct flock flock;
memset(&fi, 0, sizeof(fi));
fi.fh = arg->fh;
fi.lock_owner = arg->owner;
if (arg->lk_flags & FUSE_LK_FLOCK) {
int op = 0;
switch (arg->lk.type) {
case F_RDLCK:
op = LOCK_SH;
break;
case F_WRLCK:
op = LOCK_EX;
break;
case F_UNLCK:
op = LOCK_UN;
break;
}
if (!sleep)
op |= LOCK_NB;
if (req->se->op.flock)
req->se->op.flock(req, nodeid, &fi, op);
else
fuse_reply_err(req, ENOSYS);
} else {
convert_fuse_file_lock(&arg->lk, &flock);
if (req->se->op.setlk)
req->se->op.setlk(req, nodeid, &fi, &flock, sleep);
else
fuse_reply_err(req, ENOSYS);
}
}
static void do_setlk(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
do_setlk_common(req, nodeid, inarg, 0);
}
static void do_setlkw(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
do_setlk_common(req, nodeid, inarg, 1);
}
static int find_interrupted(struct fuse_session *se, struct fuse_req *req)
{
struct fuse_req *curr;
for (curr = se->list.next; curr != &se->list; curr = curr->next) {
if (curr->unique == req->u.i.unique) {
fuse_interrupt_func_t func;
void *data;
curr->ctr++;
pthread_mutex_unlock(&se->lock);
/* Ugh, ugly locking */
pthread_mutex_lock(&curr->lock);
pthread_mutex_lock(&se->lock);
curr->interrupted = 1;
func = curr->u.ni.func;
data = curr->u.ni.data;
pthread_mutex_unlock(&se->lock);
if (func)
func(curr, data);
pthread_mutex_unlock(&curr->lock);
pthread_mutex_lock(&se->lock);
curr->ctr--;
if (!curr->ctr)
destroy_req(curr);
return 1;
}
}
for (curr = se->interrupts.next; curr != &se->interrupts;
curr = curr->next) {
if (curr->u.i.unique == req->u.i.unique)
return 1;
}
return 0;
}
static void do_interrupt(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
struct fuse_interrupt_in *arg = (struct fuse_interrupt_in *) inarg;
struct fuse_session *se = req->se;
(void) nodeid;
if (se->debug)
fprintf(stderr, "INTERRUPT: %llu\n",
(unsigned long long) arg->unique);
req->u.i.unique = arg->unique;
pthread_mutex_lock(&se->lock);
if (find_interrupted(se, req))
destroy_req(req);
else
list_add_req(req, &se->interrupts);
pthread_mutex_unlock(&se->lock);
}
static struct fuse_req *check_interrupt(struct fuse_session *se,
struct fuse_req *req)
{
struct fuse_req *curr;
for (curr = se->interrupts.next; curr != &se->interrupts;
curr = curr->next) {
if (curr->u.i.unique == req->unique) {
req->interrupted = 1;
list_del_req(curr);
free(curr);
return NULL;
}
}
curr = se->interrupts.next;
if (curr != &se->interrupts) {
list_del_req(curr);
list_init_req(curr);
return curr;
} else
return NULL;
}
static void do_bmap(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
struct fuse_bmap_in *arg = (struct fuse_bmap_in *) inarg;
if (req->se->op.bmap)
req->se->op.bmap(req, nodeid, arg->blocksize, arg->block);
else
fuse_reply_err(req, ENOSYS);
}
static void do_ioctl(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
struct fuse_ioctl_in *arg = (struct fuse_ioctl_in *) inarg;
unsigned int flags = arg->flags;
void *in_buf = arg->in_size ? PARAM(arg) : NULL;
struct fuse_file_info fi;
if (flags & FUSE_IOCTL_DIR &&
!(req->se->conn.want & FUSE_CAP_IOCTL_DIR)) {
fuse_reply_err(req, ENOTTY);
return;
}
memset(&fi, 0, sizeof(fi));
fi.fh = arg->fh;
if (sizeof(void *) == 4 && req->se->conn.proto_minor >= 16 &&
!(flags & FUSE_IOCTL_32BIT)) {
req->ioctl_64bit = 1;
}
if (req->se->op.ioctl)
req->se->op.ioctl(req, nodeid, arg->cmd,
(void *)(uintptr_t)arg->arg, &fi, flags,
in_buf, arg->in_size, arg->out_size);
else
fuse_reply_err(req, ENOSYS);
}
void fuse_pollhandle_destroy(struct fuse_pollhandle *ph)
{
free(ph);
}
static void do_poll(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
struct fuse_poll_in *arg = (struct fuse_poll_in *) inarg;
struct fuse_file_info fi;
memset(&fi, 0, sizeof(fi));
fi.fh = arg->fh;
fi.poll_events = arg->events;
if (req->se->op.poll) {
struct fuse_pollhandle *ph = NULL;
if (arg->flags & FUSE_POLL_SCHEDULE_NOTIFY) {
ph = malloc(sizeof(struct fuse_pollhandle));
if (ph == NULL) {
fuse_reply_err(req, ENOMEM);
return;
}
ph->kh = arg->kh;
ph->se = req->se;
}
req->se->op.poll(req, nodeid, &fi, ph);
} else {
fuse_reply_err(req, ENOSYS);
}
}
static void do_fallocate(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
struct fuse_fallocate_in *arg = (struct fuse_fallocate_in *) inarg;
struct fuse_file_info fi;
memset(&fi, 0, sizeof(fi));
fi.fh = arg->fh;
if (req->se->op.fallocate)
req->se->op.fallocate(req, nodeid, arg->mode, arg->offset, arg->length, &fi);
else
fuse_reply_err(req, ENOSYS);
}
static void do_copy_file_range(fuse_req_t req, fuse_ino_t nodeid_in, const void *inarg)
{
struct fuse_copy_file_range_in *arg = (struct fuse_copy_file_range_in *) inarg;
struct fuse_file_info fi_in, fi_out;
memset(&fi_in, 0, sizeof(fi_in));
fi_in.fh = arg->fh_in;
memset(&fi_out, 0, sizeof(fi_out));
fi_out.fh = arg->fh_out;
if (req->se->op.copy_file_range)
req->se->op.copy_file_range(req, nodeid_in, arg->off_in,
&fi_in, arg->nodeid_out,
arg->off_out, &fi_out, arg->len,
arg->flags);
else
fuse_reply_err(req, ENOSYS);
}
static void do_init(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
struct fuse_init_in *arg = (struct fuse_init_in *) inarg;
struct fuse_init_out outarg;
struct fuse_session *se = req->se;
size_t bufsize = se->bufsize;
size_t outargsize = sizeof(outarg);
(void) nodeid;
if (se->debug) {
fprintf(stderr, "INIT: %u.%u\n", arg->major, arg->minor);
if (arg->major == 7 && arg->minor >= 6) {
fprintf(stderr, "flags=0x%08x\n", arg->flags);
fprintf(stderr, "max_readahead=0x%08x\n",
arg->max_readahead);
}
}
se->conn.proto_major = arg->major;
se->conn.proto_minor = arg->minor;
se->conn.capable = 0;
se->conn.want = 0;
memset(&outarg, 0, sizeof(outarg));
outarg.major = FUSE_KERNEL_VERSION;
outarg.minor = FUSE_KERNEL_MINOR_VERSION;
if (arg->major < 7) {
fprintf(stderr, "fuse: unsupported protocol version: %u.%u\n",
arg->major, arg->minor);
fuse_reply_err(req, EPROTO);
return;
}
if (arg->major > 7) {
/* Wait for a second INIT request with a 7.X version */
send_reply_ok(req, &outarg, sizeof(outarg));
return;
}
if (arg->minor >= 6) {
if (arg->max_readahead < se->conn.max_readahead)
se->conn.max_readahead = arg->max_readahead;
if (arg->flags & FUSE_ASYNC_READ)
se->conn.capable |= FUSE_CAP_ASYNC_READ;
if (arg->flags & FUSE_POSIX_LOCKS)
se->conn.capable |= FUSE_CAP_POSIX_LOCKS;
if (arg->flags & FUSE_ATOMIC_O_TRUNC)
se->conn.capable |= FUSE_CAP_ATOMIC_O_TRUNC;
if (arg->flags & FUSE_EXPORT_SUPPORT)
se->conn.capable |= FUSE_CAP_EXPORT_SUPPORT;
if (arg->flags & FUSE_DONT_MASK)
se->conn.capable |= FUSE_CAP_DONT_MASK;
if (arg->flags & FUSE_FLOCK_LOCKS)
se->conn.capable |= FUSE_CAP_FLOCK_LOCKS;
if (arg->flags & FUSE_AUTO_INVAL_DATA)
se->conn.capable |= FUSE_CAP_AUTO_INVAL_DATA;
if (arg->flags & FUSE_DO_READDIRPLUS)
se->conn.capable |= FUSE_CAP_READDIRPLUS;
if (arg->flags & FUSE_READDIRPLUS_AUTO)
se->conn.capable |= FUSE_CAP_READDIRPLUS_AUTO;
if (arg->flags & FUSE_ASYNC_DIO)
se->conn.capable |= FUSE_CAP_ASYNC_DIO;
if (arg->flags & FUSE_WRITEBACK_CACHE)
se->conn.capable |= FUSE_CAP_WRITEBACK_CACHE;
if (arg->flags & FUSE_NO_OPEN_SUPPORT)
se->conn.capable |= FUSE_CAP_NO_OPEN_SUPPORT;
if (arg->flags & FUSE_PARALLEL_DIROPS)
se->conn.capable |= FUSE_CAP_PARALLEL_DIROPS;
if (arg->flags & FUSE_POSIX_ACL)
se->conn.capable |= FUSE_CAP_POSIX_ACL;
if (arg->flags & FUSE_HANDLE_KILLPRIV)
se->conn.capable |= FUSE_CAP_HANDLE_KILLPRIV;
} else {
se->conn.max_readahead = 0;
}
if (se->conn.proto_minor >= 14) {
#ifdef HAVE_SPLICE
#ifdef HAVE_VMSPLICE
se->conn.capable |= FUSE_CAP_SPLICE_WRITE | FUSE_CAP_SPLICE_MOVE;
#endif
se->conn.capable |= FUSE_CAP_SPLICE_READ;
#endif
}
if (se->conn.proto_minor >= 18)
se->conn.capable |= FUSE_CAP_IOCTL_DIR;
/* Default settings for modern filesystems.
*
* Most of these capabilities were disabled by default in
* libfuse2 for backwards compatibility reasons. In libfuse3,
* we can finally enable them by default (as long as they're
* supported by the kernel).
*/
#define LL_SET_DEFAULT(cond, cap) \
if ((cond) && (se->conn.capable & (cap))) \
se->conn.want |= (cap)
LL_SET_DEFAULT(1, FUSE_CAP_ASYNC_READ);
LL_SET_DEFAULT(1, FUSE_CAP_PARALLEL_DIROPS);
LL_SET_DEFAULT(1, FUSE_CAP_AUTO_INVAL_DATA);
LL_SET_DEFAULT(1, FUSE_CAP_HANDLE_KILLPRIV);
LL_SET_DEFAULT(1, FUSE_CAP_ASYNC_DIO);
LL_SET_DEFAULT(1, FUSE_CAP_IOCTL_DIR);
LL_SET_DEFAULT(1, FUSE_CAP_ATOMIC_O_TRUNC);
LL_SET_DEFAULT(se->op.write_buf, FUSE_CAP_SPLICE_READ);
LL_SET_DEFAULT(se->op.getlk && se->op.setlk,
FUSE_CAP_POSIX_LOCKS);
LL_SET_DEFAULT(se->op.flock, FUSE_CAP_FLOCK_LOCKS);
LL_SET_DEFAULT(se->op.readdirplus, FUSE_CAP_READDIRPLUS);
LL_SET_DEFAULT(se->op.readdirplus && se->op.readdir,
FUSE_CAP_READDIRPLUS_AUTO);
se->conn.time_gran = 1;
if (bufsize < FUSE_MIN_READ_BUFFER) {
fprintf(stderr, "fuse: warning: buffer size too small: %zu\n",
bufsize);
bufsize = FUSE_MIN_READ_BUFFER;
}
bufsize -= 4096;
if (bufsize < se->conn.max_write)
se->conn.max_write = bufsize;
se->got_init = 1;
if (se->op.init)
se->op.init(se->userdata, &se->conn);
if (se->conn.want & (~se->conn.capable)) {
fprintf(stderr, "fuse: error: filesystem requested capabilities "
"0x%x that are not supported by kernel, aborting.\n",
se->conn.want & (~se->conn.capable));
fuse_reply_err(req, EPROTO);
se->error = -EPROTO;
fuse_session_exit(se);
return;
}
unsigned max_read_mo = get_max_read(se->mo);
if (se->conn.max_read != max_read_mo) {
fprintf(stderr, "fuse: error: init() and fuse_session_new() "
"requested different maximum read size (%u vs %u)\n",
se->conn.max_read, max_read_mo);
fuse_reply_err(req, EPROTO);
se->error = -EPROTO;
fuse_session_exit(se);
return;
}
/* Always enable big writes, this is superseded
by the max_write option */
outarg.flags |= FUSE_BIG_WRITES;
if (se->conn.want & FUSE_CAP_ASYNC_READ)
outarg.flags |= FUSE_ASYNC_READ;
if (se->conn.want & FUSE_CAP_POSIX_LOCKS)
outarg.flags |= FUSE_POSIX_LOCKS;
if (se->conn.want & FUSE_CAP_ATOMIC_O_TRUNC)
outarg.flags |= FUSE_ATOMIC_O_TRUNC;
if (se->conn.want & FUSE_CAP_EXPORT_SUPPORT)
outarg.flags |= FUSE_EXPORT_SUPPORT;
if (se->conn.want & FUSE_CAP_DONT_MASK)
outarg.flags |= FUSE_DONT_MASK;
if (se->conn.want & FUSE_CAP_FLOCK_LOCKS)
outarg.flags |= FUSE_FLOCK_LOCKS;
if (se->conn.want & FUSE_CAP_AUTO_INVAL_DATA)
outarg.flags |= FUSE_AUTO_INVAL_DATA;
if (se->conn.want & FUSE_CAP_READDIRPLUS)
outarg.flags |= FUSE_DO_READDIRPLUS;
if (se->conn.want & FUSE_CAP_READDIRPLUS_AUTO)
outarg.flags |= FUSE_READDIRPLUS_AUTO;
if (se->conn.want & FUSE_CAP_ASYNC_DIO)
outarg.flags |= FUSE_ASYNC_DIO;
if (se->conn.want & FUSE_CAP_WRITEBACK_CACHE)
outarg.flags |= FUSE_WRITEBACK_CACHE;
if (se->conn.want & FUSE_CAP_POSIX_ACL)
outarg.flags |= FUSE_POSIX_ACL;
outarg.max_readahead = se->conn.max_readahead;
outarg.max_write = se->conn.max_write;
if (se->conn.proto_minor >= 13) {
if (se->conn.max_background >= (1 << 16))
se->conn.max_background = (1 << 16) - 1;
if (se->conn.congestion_threshold > se->conn.max_background)
se->conn.congestion_threshold = se->conn.max_background;
if (!se->conn.congestion_threshold) {
se->conn.congestion_threshold =
se->conn.max_background * 3 / 4;
}
outarg.max_background = se->conn.max_background;
outarg.congestion_threshold = se->conn.congestion_threshold;
}
if (se->conn.proto_minor >= 23)
outarg.time_gran = se->conn.time_gran;
if (se->debug) {
fprintf(stderr, " INIT: %u.%u\n", outarg.major, outarg.minor);
fprintf(stderr, " flags=0x%08x\n", outarg.flags);
fprintf(stderr, " max_readahead=0x%08x\n",
outarg.max_readahead);
fprintf(stderr, " max_write=0x%08x\n", outarg.max_write);
fprintf(stderr, " max_background=%i\n",
outarg.max_background);
fprintf(stderr, " congestion_threshold=%i\n",
outarg.congestion_threshold);
fprintf(stderr, " time_gran=%u\n",
outarg.time_gran);
}
if (arg->minor < 5)
outargsize = FUSE_COMPAT_INIT_OUT_SIZE;
else if (arg->minor < 23)
outargsize = FUSE_COMPAT_22_INIT_OUT_SIZE;
send_reply_ok(req, &outarg, outargsize);
}
static void do_destroy(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
struct fuse_session *se = req->se;
(void) nodeid;
(void) inarg;
se->got_destroy = 1;
if (se->op.destroy)
se->op.destroy(se->userdata);
send_reply_ok(req, NULL, 0);
}
static void list_del_nreq(struct fuse_notify_req *nreq)
{
struct fuse_notify_req *prev = nreq->prev;
struct fuse_notify_req *next = nreq->next;
prev->next = next;
next->prev = prev;
}
static void list_add_nreq(struct fuse_notify_req *nreq,
struct fuse_notify_req *next)
{
struct fuse_notify_req *prev = next->prev;
nreq->next = next;
nreq->prev = prev;
prev->next = nreq;
next->prev = nreq;
}
static void list_init_nreq(struct fuse_notify_req *nreq)
{
nreq->next = nreq;
nreq->prev = nreq;
}
static void do_notify_reply(fuse_req_t req, fuse_ino_t nodeid,
const void *inarg, const struct fuse_buf *buf)
{
struct fuse_session *se = req->se;
struct fuse_notify_req *nreq;
struct fuse_notify_req *head;
pthread_mutex_lock(&se->lock);
head = &se->notify_list;
for (nreq = head->next; nreq != head; nreq = nreq->next) {
if (nreq->unique == req->unique) {
list_del_nreq(nreq);
break;
}
}
pthread_mutex_unlock(&se->lock);
if (nreq != head)
nreq->reply(nreq, req, nodeid, inarg, buf);
}
static int send_notify_iov(struct fuse_session *se, int notify_code,
struct iovec *iov, int count)
{
struct fuse_out_header out;
if (!se->got_init)
return -ENOTCONN;
out.unique = 0;
out.error = notify_code;
iov[0].iov_base = &out;
iov[0].iov_len = sizeof(struct fuse_out_header);
return fuse_send_msg(se, NULL, iov, count);
}
int fuse_lowlevel_notify_poll(struct fuse_pollhandle *ph)
{
if (ph != NULL) {
struct fuse_notify_poll_wakeup_out outarg;
struct iovec iov[2];
outarg.kh = ph->kh;
iov[1].iov_base = &outarg;
iov[1].iov_len = sizeof(outarg);
return send_notify_iov(ph->se, FUSE_NOTIFY_POLL, iov, 2);
} else {
return 0;
}
}
int fuse_lowlevel_notify_inval_inode(struct fuse_session *se, fuse_ino_t ino,
off_t off, off_t len)
{
struct fuse_notify_inval_inode_out outarg;
struct iovec iov[2];
if (!se)
return -EINVAL;
if (se->conn.proto_major < 6 || se->conn.proto_minor < 12)
return -ENOSYS;
outarg.ino = ino;
outarg.off = off;
outarg.len = len;
iov[1].iov_base = &outarg;
iov[1].iov_len = sizeof(outarg);
return send_notify_iov(se, FUSE_NOTIFY_INVAL_INODE, iov, 2);
}
int fuse_lowlevel_notify_inval_entry(struct fuse_session *se, fuse_ino_t parent,
const char *name, size_t namelen)
{
struct fuse_notify_inval_entry_out outarg;
struct iovec iov[3];
if (!se)
return -EINVAL;
if (se->conn.proto_major < 6 || se->conn.proto_minor < 12)
return -ENOSYS;
outarg.parent = parent;
outarg.namelen = namelen;
outarg.padding = 0;
iov[1].iov_base = &outarg;
iov[1].iov_len = sizeof(outarg);
iov[2].iov_base = (void *)name;
iov[2].iov_len = namelen + 1;
return send_notify_iov(se, FUSE_NOTIFY_INVAL_ENTRY, iov, 3);
}
int fuse_lowlevel_notify_delete(struct fuse_session *se,
fuse_ino_t parent, fuse_ino_t child,
const char *name, size_t namelen)
{
struct fuse_notify_delete_out outarg;
struct iovec iov[3];
if (!se)
return -EINVAL;
if (se->conn.proto_major < 6 || se->conn.proto_minor < 18)
return -ENOSYS;
outarg.parent = parent;
outarg.child = child;
outarg.namelen = namelen;
outarg.padding = 0;
iov[1].iov_base = &outarg;
iov[1].iov_len = sizeof(outarg);
iov[2].iov_base = (void *)name;
iov[2].iov_len = namelen + 1;
return send_notify_iov(se, FUSE_NOTIFY_DELETE, iov, 3);
}
int fuse_lowlevel_notify_store(struct fuse_session *se, fuse_ino_t ino,
off_t offset, struct fuse_bufvec *bufv,
enum fuse_buf_copy_flags flags)
{
struct fuse_out_header out;
struct fuse_notify_store_out outarg;
struct iovec iov[3];
size_t size = fuse_buf_size(bufv);
int res;
if (!se)
return -EINVAL;
if (se->conn.proto_major < 6 || se->conn.proto_minor < 15)
return -ENOSYS;
out.unique = 0;
out.error = FUSE_NOTIFY_STORE;
outarg.nodeid = ino;
outarg.offset = offset;
outarg.size = size;
outarg.padding = 0;
iov[0].iov_base = &out;
iov[0].iov_len = sizeof(out);
iov[1].iov_base = &outarg;
iov[1].iov_len = sizeof(outarg);
res = fuse_send_data_iov(se, NULL, iov, 2, bufv, flags);
if (res > 0)
res = -res;
return res;
}
struct fuse_retrieve_req {
struct fuse_notify_req nreq;
void *cookie;
};
static void fuse_ll_retrieve_reply(struct fuse_notify_req *nreq,
fuse_req_t req, fuse_ino_t ino,
const void *inarg,
const struct fuse_buf *ibuf)
{
struct fuse_session *se = req->se;
struct fuse_retrieve_req *rreq =
container_of(nreq, struct fuse_retrieve_req, nreq);
const struct fuse_notify_retrieve_in *arg = inarg;
struct fuse_bufvec bufv = {
.buf[0] = *ibuf,
.count = 1,
};
if (!(bufv.buf[0].flags & FUSE_BUF_IS_FD))
bufv.buf[0].mem = PARAM(arg);
bufv.buf[0].size -= sizeof(struct fuse_in_header) +
sizeof(struct fuse_notify_retrieve_in);
if (bufv.buf[0].size < arg->size) {
fprintf(stderr, "fuse: retrieve reply: buffer size too small\n");
fuse_reply_none(req);
goto out;
}
bufv.buf[0].size = arg->size;
if (se->op.retrieve_reply) {
se->op.retrieve_reply(req, rreq->cookie, ino,
arg->offset, &bufv);
} else {
fuse_reply_none(req);
}
out:
free(rreq);
if ((ibuf->flags & FUSE_BUF_IS_FD) && bufv.idx < bufv.count)
fuse_ll_clear_pipe(se);
}
int fuse_lowlevel_notify_retrieve(struct fuse_session *se, fuse_ino_t ino,
size_t size, off_t offset, void *cookie)
{
struct fuse_notify_retrieve_out outarg;
struct iovec iov[2];
struct fuse_retrieve_req *rreq;
int err;
if (!se)
return -EINVAL;
if (se->conn.proto_major < 6 || se->conn.proto_minor < 15)
return -ENOSYS;
rreq = malloc(sizeof(*rreq));
if (rreq == NULL)
return -ENOMEM;
pthread_mutex_lock(&se->lock);
rreq->cookie = cookie;
rreq->nreq.unique = se->notify_ctr++;
rreq->nreq.reply = fuse_ll_retrieve_reply;
list_add_nreq(&rreq->nreq, &se->notify_list);
pthread_mutex_unlock(&se->lock);
outarg.notify_unique = rreq->nreq.unique;
outarg.nodeid = ino;
outarg.offset = offset;
outarg.size = size;
outarg.padding = 0;
iov[1].iov_base = &outarg;
iov[1].iov_len = sizeof(outarg);
err = send_notify_iov(se, FUSE_NOTIFY_RETRIEVE, iov, 2);
if (err) {
pthread_mutex_lock(&se->lock);
list_del_nreq(&rreq->nreq);
pthread_mutex_unlock(&se->lock);
free(rreq);
}
return err;
}
void *fuse_req_userdata(fuse_req_t req)
{
return req->se->userdata;
}
const struct fuse_ctx *fuse_req_ctx(fuse_req_t req)
{
return &req->ctx;
}
void fuse_req_interrupt_func(fuse_req_t req, fuse_interrupt_func_t func,
void *data)
{
pthread_mutex_lock(&req->lock);
pthread_mutex_lock(&req->se->lock);
req->u.ni.func = func;
req->u.ni.data = data;
pthread_mutex_unlock(&req->se->lock);
if (req->interrupted && func)
func(req, data);
pthread_mutex_unlock(&req->lock);
}
int fuse_req_interrupted(fuse_req_t req)
{
int interrupted;
pthread_mutex_lock(&req->se->lock);
interrupted = req->interrupted;
pthread_mutex_unlock(&req->se->lock);
return interrupted;
}
static struct {
void (*func)(fuse_req_t, fuse_ino_t, const void *);
const char *name;
} fuse_ll_ops[] = {
[FUSE_LOOKUP] = { do_lookup, "LOOKUP" },
[FUSE_FORGET] = { do_forget, "FORGET" },
[FUSE_GETATTR] = { do_getattr, "GETATTR" },
[FUSE_SETATTR] = { do_setattr, "SETATTR" },
[FUSE_READLINK] = { do_readlink, "READLINK" },
[FUSE_SYMLINK] = { do_symlink, "SYMLINK" },
[FUSE_MKNOD] = { do_mknod, "MKNOD" },
[FUSE_MKDIR] = { do_mkdir, "MKDIR" },
[FUSE_UNLINK] = { do_unlink, "UNLINK" },
[FUSE_RMDIR] = { do_rmdir, "RMDIR" },
[FUSE_RENAME] = { do_rename, "RENAME" },
[FUSE_LINK] = { do_link, "LINK" },
[FUSE_OPEN] = { do_open, "OPEN" },
[FUSE_READ] = { do_read, "READ" },
[FUSE_WRITE] = { do_write, "WRITE" },
[FUSE_STATFS] = { do_statfs, "STATFS" },
[FUSE_RELEASE] = { do_release, "RELEASE" },
[FUSE_FSYNC] = { do_fsync, "FSYNC" },
[FUSE_SETXATTR] = { do_setxattr, "SETXATTR" },
[FUSE_GETXATTR] = { do_getxattr, "GETXATTR" },
[FUSE_LISTXATTR] = { do_listxattr, "LISTXATTR" },
[FUSE_REMOVEXATTR] = { do_removexattr, "REMOVEXATTR" },
[FUSE_FLUSH] = { do_flush, "FLUSH" },
[FUSE_INIT] = { do_init, "INIT" },
[FUSE_OPENDIR] = { do_opendir, "OPENDIR" },
[FUSE_READDIR] = { do_readdir, "READDIR" },
[FUSE_RELEASEDIR] = { do_releasedir, "RELEASEDIR" },
[FUSE_FSYNCDIR] = { do_fsyncdir, "FSYNCDIR" },
[FUSE_GETLK] = { do_getlk, "GETLK" },
[FUSE_SETLK] = { do_setlk, "SETLK" },
[FUSE_SETLKW] = { do_setlkw, "SETLKW" },
[FUSE_ACCESS] = { do_access, "ACCESS" },
[FUSE_CREATE] = { do_create, "CREATE" },
[FUSE_INTERRUPT] = { do_interrupt, "INTERRUPT" },
[FUSE_BMAP] = { do_bmap, "BMAP" },
[FUSE_IOCTL] = { do_ioctl, "IOCTL" },
[FUSE_POLL] = { do_poll, "POLL" },
[FUSE_FALLOCATE] = { do_fallocate, "FALLOCATE" },
[FUSE_DESTROY] = { do_destroy, "DESTROY" },
[FUSE_NOTIFY_REPLY] = { (void *) 1, "NOTIFY_REPLY" },
[FUSE_BATCH_FORGET] = { do_batch_forget, "BATCH_FORGET" },
[FUSE_READDIRPLUS] = { do_readdirplus, "READDIRPLUS"},
[FUSE_RENAME2] = { do_rename2, "RENAME2" },
[FUSE_COPY_FILE_RANGE] = { do_copy_file_range, "COPY_FILE_RANGE" },
[CUSE_INIT] = { cuse_lowlevel_init, "CUSE_INIT" },
};
#define FUSE_MAXOP (sizeof(fuse_ll_ops) / sizeof(fuse_ll_ops[0]))
static const char *opname(enum fuse_opcode opcode)
{
if (opcode >= FUSE_MAXOP || !fuse_ll_ops[opcode].name)
return "???";
else
return fuse_ll_ops[opcode].name;
}
static int fuse_ll_copy_from_pipe(struct fuse_bufvec *dst,
struct fuse_bufvec *src)
{
ssize_t res = fuse_buf_copy(dst, src, 0);
if (res < 0) {
fprintf(stderr, "fuse: copy from pipe: %s\n", strerror(-res));
return res;
}
if ((size_t)res < fuse_buf_size(dst)) {
fprintf(stderr, "fuse: copy from pipe: short read\n");
return -1;
}
return 0;
}
void fuse_session_process_buf(struct fuse_session *se,
const struct fuse_buf *buf)
{
fuse_session_process_buf_int(se, buf, NULL);
}
void fuse_session_process_buf_int(struct fuse_session *se,
const struct fuse_buf *buf, struct fuse_chan *ch)
{
const size_t write_header_size = sizeof(struct fuse_in_header) +
sizeof(struct fuse_write_in);
struct fuse_bufvec bufv = { .buf[0] = *buf, .count = 1 };
struct fuse_bufvec tmpbuf = FUSE_BUFVEC_INIT(write_header_size);
struct fuse_in_header *in;
const void *inarg;
struct fuse_req *req;
void *mbuf = NULL;
int err;
int res;
if (buf->flags & FUSE_BUF_IS_FD) {
if (buf->size < tmpbuf.buf[0].size)
tmpbuf.buf[0].size = buf->size;
mbuf = malloc(tmpbuf.buf[0].size);
if (mbuf == NULL) {
fprintf(stderr, "fuse: failed to allocate header\n");
goto clear_pipe;
}
tmpbuf.buf[0].mem = mbuf;
res = fuse_ll_copy_from_pipe(&tmpbuf, &bufv);
if (res < 0)
goto clear_pipe;
in = mbuf;
} else {
in = buf->mem;
}
if (se->debug) {
fprintf(stderr,
"unique: %llu, opcode: %s (%i), nodeid: %llu, insize: %zu, pid: %u\n",
(unsigned long long) in->unique,
opname((enum fuse_opcode) in->opcode), in->opcode,
(unsigned long long) in->nodeid, buf->size, in->pid);
}
req = fuse_ll_alloc_req(se);
if (req == NULL) {
struct fuse_out_header out = {
.unique = in->unique,
.error = -ENOMEM,
};
struct iovec iov = {
.iov_base = &out,
.iov_len = sizeof(struct fuse_out_header),
};
fuse_send_msg(se, ch, &iov, 1);
goto clear_pipe;
}
req->unique = in->unique;
req->ctx.uid = in->uid;
req->ctx.gid = in->gid;
req->ctx.pid = in->pid;
req->ch = ch ? fuse_chan_get(ch) : NULL;
err = EIO;
if (!se->got_init) {
enum fuse_opcode expected;
expected = se->cuse_data ? CUSE_INIT : FUSE_INIT;
if (in->opcode != expected)
goto reply_err;
} else if (in->opcode == FUSE_INIT || in->opcode == CUSE_INIT)
goto reply_err;
err = EACCES;
/* Implement -o allow_root */
if (se->deny_others && in->uid != se->owner && in->uid != 0 &&
in->opcode != FUSE_INIT && in->opcode != FUSE_READ &&
in->opcode != FUSE_WRITE && in->opcode != FUSE_FSYNC &&
in->opcode != FUSE_RELEASE && in->opcode != FUSE_READDIR &&
in->opcode != FUSE_FSYNCDIR && in->opcode != FUSE_RELEASEDIR &&
in->opcode != FUSE_NOTIFY_REPLY &&
in->opcode != FUSE_READDIRPLUS)
goto reply_err;
err = ENOSYS;
if (in->opcode >= FUSE_MAXOP || !fuse_ll_ops[in->opcode].func)
goto reply_err;
if (in->opcode != FUSE_INTERRUPT) {
struct fuse_req *intr;
pthread_mutex_lock(&se->lock);
intr = check_interrupt(se, req);
list_add_req(req, &se->list);
pthread_mutex_unlock(&se->lock);
if (intr)
fuse_reply_err(intr, EAGAIN);
}
if ((buf->flags & FUSE_BUF_IS_FD) && write_header_size < buf->size &&
(in->opcode != FUSE_WRITE || !se->op.write_buf) &&
in->opcode != FUSE_NOTIFY_REPLY) {
void *newmbuf;
err = ENOMEM;
newmbuf = realloc(mbuf, buf->size);
if (newmbuf == NULL)
goto reply_err;
mbuf = newmbuf;
tmpbuf = FUSE_BUFVEC_INIT(buf->size - write_header_size);
tmpbuf.buf[0].mem = mbuf + write_header_size;
res = fuse_ll_copy_from_pipe(&tmpbuf, &bufv);
err = -res;
if (res < 0)
goto reply_err;
in = mbuf;
}
inarg = (void *) &in[1];
if (in->opcode == FUSE_WRITE && se->op.write_buf)
do_write_buf(req, in->nodeid, inarg, buf);
else if (in->opcode == FUSE_NOTIFY_REPLY)
do_notify_reply(req, in->nodeid, inarg, buf);
else
fuse_ll_ops[in->opcode].func(req, in->nodeid, inarg);
out_free:
free(mbuf);
return;
reply_err:
fuse_reply_err(req, err);
clear_pipe:
if (buf->flags & FUSE_BUF_IS_FD)
fuse_ll_clear_pipe(se);
goto out_free;
}
#define LL_OPTION(n,o,v) \
{ n, offsetof(struct fuse_session, o), v }
static const struct fuse_opt fuse_ll_opts[] = {
LL_OPTION("debug", debug, 1),
LL_OPTION("-d", debug, 1),
LL_OPTION("--debug", debug, 1),
LL_OPTION("allow_root", deny_others, 1),
FUSE_OPT_END
};
void fuse_lowlevel_version(void)
{
printf("using FUSE kernel interface version %i.%i\n",
FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION);
fuse_mount_version();
}
void fuse_lowlevel_help(void)
{
/* These are not all options, but the ones that are
potentially of interest to an end-user */
printf(
" -o allow_other allow access by all users\n"
" -o allow_root allow access by root\n"
" -o auto_unmount auto unmount on process termination\n");
}
void fuse_session_destroy(struct fuse_session *se)
{
struct fuse_ll_pipe *llp;
if (se->got_init && !se->got_destroy) {
if (se->op.destroy)
se->op.destroy(se->userdata);
}
llp = pthread_getspecific(se->pipe_key);
if (llp != NULL)
fuse_ll_pipe_free(llp);
pthread_key_delete(se->pipe_key);
pthread_mutex_destroy(&se->lock);
free(se->cuse_data);
if (se->fd != -1)
close(se->fd);
destroy_mount_opts(se->mo);
free(se);
}
static void fuse_ll_pipe_destructor(void *data)
{
struct fuse_ll_pipe *llp = data;
fuse_ll_pipe_free(llp);
}
int fuse_session_receive_buf(struct fuse_session *se, struct fuse_buf *buf)
{
return fuse_session_receive_buf_int(se, buf, NULL);
}
int fuse_session_receive_buf_int(struct fuse_session *se, struct fuse_buf *buf,
struct fuse_chan *ch)
{
int err;
ssize_t res;
#ifdef HAVE_SPLICE
size_t bufsize = se->bufsize;
struct fuse_ll_pipe *llp;
struct fuse_buf tmpbuf;
if (se->conn.proto_minor < 14 || !(se->conn.want & FUSE_CAP_SPLICE_READ))
goto fallback;
llp = fuse_ll_get_pipe(se);
if (llp == NULL)
goto fallback;
if (llp->size < bufsize) {
if (llp->can_grow) {
res = fcntl(llp->pipe[0], F_SETPIPE_SZ, bufsize);
if (res == -1) {
llp->can_grow = 0;
goto fallback;
}
llp->size = res;
}
if (llp->size < bufsize)
goto fallback;
}
res = splice(ch ? ch->fd : se->fd,
NULL, llp->pipe[1], NULL, bufsize, 0);
err = errno;
if (fuse_session_exited(se))
return 0;
if (res == -1) {
if (err == ENODEV) {
/* Filesystem was unmounted, or connection was aborted
via /sys/fs/fuse/connections */
fuse_session_exit(se);
return 0;
}
if (err != EINTR && err != EAGAIN)
perror("fuse: splice from device");
return -err;
}
if (res < sizeof(struct fuse_in_header)) {
fprintf(stderr, "short splice from fuse device\n");
return -EIO;
}
tmpbuf = (struct fuse_buf) {
.size = res,
.flags = FUSE_BUF_IS_FD,
.fd = llp->pipe[0],
};
/*
* Don't bother with zero copy for small requests.
* fuse_loop_mt() needs to check for FORGET so this more than
* just an optimization.
*/
if (res < sizeof(struct fuse_in_header) +
sizeof(struct fuse_write_in) + pagesize) {
struct fuse_bufvec src = { .buf[0] = tmpbuf, .count = 1 };
struct fuse_bufvec dst = { .count = 1 };
if (!buf->mem) {
buf->mem = malloc(se->bufsize);
if (!buf->mem) {
fprintf(stderr,
"fuse: failed to allocate read buffer\n");
return -ENOMEM;
}
}
buf->size = se->bufsize;
buf->flags = 0;
dst.buf[0] = *buf;
res = fuse_buf_copy(&dst, &src, 0);
if (res < 0) {
fprintf(stderr, "fuse: copy from pipe: %s\n",
strerror(-res));
fuse_ll_clear_pipe(se);
return res;
}
if (res < tmpbuf.size) {
fprintf(stderr, "fuse: copy from pipe: short read\n");
fuse_ll_clear_pipe(se);
return -EIO;
}
assert(res == tmpbuf.size);
} else {
/* Don't overwrite buf->mem, as that would cause a leak */
buf->fd = tmpbuf.fd;
buf->flags = tmpbuf.flags;
}
buf->size = tmpbuf.size;
return res;
fallback:
#endif
if (!buf->mem) {
buf->mem = malloc(se->bufsize);
if (!buf->mem) {
fprintf(stderr,
"fuse: failed to allocate read buffer\n");
return -ENOMEM;
}
}
restart:
res = read(ch ? ch->fd : se->fd, buf->mem, se->bufsize);
err = errno;
if (fuse_session_exited(se))
return 0;
if (res == -1) {
/* ENOENT means the operation was interrupted, it's safe
to restart */
if (err == ENOENT)
goto restart;
if (err == ENODEV) {
/* Filesystem was unmounted, or connection was aborted
via /sys/fs/fuse/connections */
fuse_session_exit(se);
return 0;
}
/* Errors occurring during normal operation: EINTR (read
interrupted), EAGAIN (nonblocking I/O), ENODEV (filesystem
umounted) */
if (err != EINTR && err != EAGAIN)
perror("fuse: reading device");
return -err;
}
if ((size_t) res < sizeof(struct fuse_in_header)) {
fprintf(stderr, "short read on fuse device\n");
return -EIO;
}
buf->size = res;
return res;
}
#define KERNEL_BUF_PAGES 32
/* room needed in buffer to accommodate header */
#define HEADER_SIZE 0x1000
struct fuse_session *fuse_session_new(struct fuse_args *args,
const struct fuse_lowlevel_ops *op,
size_t op_size, void *userdata)
{
int err;
struct fuse_session *se;
struct mount_opts *mo;
if (sizeof(struct fuse_lowlevel_ops) < op_size) {
fprintf(stderr, "fuse: warning: library too old, some operations may not work\n");
op_size = sizeof(struct fuse_lowlevel_ops);
}
if (args->argc == 0) {
fprintf(stderr, "fuse: empty argv passed to fuse_session_new().\n");
return NULL;
}
se = (struct fuse_session *) calloc(1, sizeof(struct fuse_session));
if (se == NULL) {
fprintf(stderr, "fuse: failed to allocate fuse object\n");
goto out1;
}
se->fd = -1;
se->conn.max_write = UINT_MAX;
se->conn.max_readahead = UINT_MAX;
/* Parse options */
if(fuse_opt_parse(args, se, fuse_ll_opts, NULL) == -1)
goto out2;
if(se->deny_others) {
/* Allowing access only by root is done by instructing
* kernel to allow access by everyone, and then restricting
* access to root and mountpoint owner in libfuse.
*/
// We may be adding the option a second time, but
// that doesn't hurt.
if(fuse_opt_add_arg(args, "-oallow_other") == -1)
goto out2;
}
mo = parse_mount_opts(args);
if (mo == NULL)
goto out3;
if(args->argc == 1 &&
args->argv[0][0] == '-') {
fprintf(stderr, "fuse: warning: argv[0] looks like an option, but "
"will be ignored\n");
} else if (args->argc != 1) {
int i;
fprintf(stderr, "fuse: unknown option(s): `");
for(i = 1; i < args->argc-1; i++)
fprintf(stderr, "%s ", args->argv[i]);
fprintf(stderr, "%s'\n", args->argv[i]);
goto out4;
}
if (se->debug)
fprintf(stderr, "FUSE library version: %s\n", PACKAGE_VERSION);
se->bufsize = KERNEL_BUF_PAGES * getpagesize() + HEADER_SIZE;
list_init_req(&se->list);
list_init_req(&se->interrupts);
list_init_nreq(&se->notify_list);
se->notify_ctr = 1;
fuse_mutex_init(&se->lock);
err = pthread_key_create(&se->pipe_key, fuse_ll_pipe_destructor);
if (err) {
fprintf(stderr, "fuse: failed to create thread specific key: %s\n",
strerror(err));
goto out5;
}
memcpy(&se->op, op, op_size);
se->owner = getuid();
se->userdata = userdata;
se->mo = mo;
return se;
out5:
pthread_mutex_destroy(&se->lock);
out4:
fuse_opt_free_args(args);
out3:
free(mo);
out2:
free(se);
out1:
return NULL;
}
int fuse_session_mount(struct fuse_session *se, const char *mountpoint)
{
int fd;
/*
* Make sure file descriptors 0, 1 and 2 are open, otherwise chaos
* would ensue.
*/
do {
fd = open("/dev/null", O_RDWR);
if (fd > 2)
close(fd);
} while (fd >= 0 && fd <= 2);
/*
* To allow FUSE daemons to run without privileges, the caller may open
* /dev/fuse before launching the file system and pass on the file
* descriptor by specifying /dev/fd/N as the mount point. Note that the
* parent process takes care of performing the mount in this case.
*/
fd = fuse_mnt_parse_fuse_fd(mountpoint);
if (fd != -1) {
if (fcntl(fd, F_GETFD) == -1) {
fprintf(stderr,
"fuse: Invalid file descriptor /dev/fd/%u\n",
fd);
return -1;
}
se->fd = fd;
return 0;
}
/* Open channel */
fd = fuse_kern_mount(mountpoint, se->mo);
if (fd == -1)
return -1;
se->fd = fd;
/* Save mountpoint */
se->mountpoint = strdup(mountpoint);
if (se->mountpoint == NULL)
goto error_out;
return 0;
error_out:
fuse_kern_unmount(mountpoint, fd);
return -1;
}
int fuse_session_fd(struct fuse_session *se)
{
return se->fd;
}
void fuse_session_unmount(struct fuse_session *se)
{
if (se->mountpoint != NULL) {
fuse_kern_unmount(se->mountpoint, se->fd);
free(se->mountpoint);
se->mountpoint = NULL;
}
}
#ifdef linux
int fuse_req_getgroups(fuse_req_t req, int size, gid_t list[])
{
char *buf;
size_t bufsize = 1024;
char path[128];
int ret;
int fd;
unsigned long pid = req->ctx.pid;
char *s;
sprintf(path, "/proc/%lu/task/%lu/status", pid, pid);
retry:
buf = malloc(bufsize);
if (buf == NULL)
return -ENOMEM;
ret = -EIO;
fd = open(path, O_RDONLY);
if (fd == -1)
goto out_free;
ret = read(fd, buf, bufsize);
close(fd);
if (ret < 0) {
ret = -EIO;
goto out_free;
}
if ((size_t)ret == bufsize) {
free(buf);
bufsize *= 4;
goto retry;
}
ret = -EIO;
s = strstr(buf, "\nGroups:");
if (s == NULL)
goto out_free;
s += 8;
ret = 0;
while (1) {
char *end;
unsigned long val = strtoul(s, &end, 0);
if (end == s)
break;
s = end;
if (ret < size)
list[ret] = val;
ret++;
}
out_free:
free(buf);
return ret;
}
#else /* linux */
/*
* This is currently not implemented on other than Linux...
*/
int fuse_req_getgroups(fuse_req_t req, int size, gid_t list[])
{
(void) req; (void) size; (void) list;
return -ENOSYS;
}
#endif
void fuse_session_exit(struct fuse_session *se)
{
se->exited = 1;
}
void fuse_session_reset(struct fuse_session *se)
{
se->exited = 0;
se->error = 0;
}
int fuse_session_exited(struct fuse_session *se)
{
return se->exited;
}
fuse_session_destroy
void fuse_session_destroy(struct fuse_session *se)
Definition: fuse_lowlevel.c:2621
fuse_reply_err
int fuse_reply_err(fuse_req_t req, int err)
Definition: fuse_lowlevel.c:312
fuse_bufvec::off
size_t off
Definition: fuse_common.h:679
FUSE_CAP_IOCTL_DIR
#define FUSE_CAP_IOCTL_DIR
Definition: fuse_common.h:197
fuse_session_receive_buf
int fuse_session_receive_buf(struct fuse_session *se, struct fuse_buf *buf)
Definition: fuse_lowlevel.c:2648
fuse_session_new
struct fuse_session * fuse_session_new(struct fuse_args *args, const struct fuse_lowlevel_ops *op, size_t op_size, void *userdata)
Definition: fuse_lowlevel.c:2809
fuse_session_exit
void fuse_session_exit(struct fuse_session *se)
Definition: fuse_lowlevel.c:3037
fuse_file_info::fh
uint64_t fh
Definition: fuse_common.h:72
fuse_lowlevel_notify_retrieve
int fuse_lowlevel_notify_retrieve(struct fuse_session *se, fuse_ino_t ino, size_t size, off_t offset, void *cookie)
Definition: fuse_lowlevel.c:2293
fuse_lowlevel_notify_delete
int fuse_lowlevel_notify_delete(struct fuse_session *se, fuse_ino_t parent, fuse_ino_t child, const char *name, size_t namelen)
Definition: fuse_lowlevel.c:2187
fuse_file_info::writepage
unsigned int writepage
Definition: fuse_common.h:43
fuse_reply_ioctl
int fuse_reply_ioctl(fuse_req_t req, int result, const void *buf, size_t size)
Definition: fuse_lowlevel.c:979
fuse_lowlevel_help
void fuse_lowlevel_help(void)
Definition: fuse_lowlevel.c:2611
fuse_args::argc
int argc
Definition: fuse_opt.h:111
fuse_file_info::direct_io
unsigned int direct_io
Definition: fuse_common.h:46
FUSE_BUF_IS_FD
Definition: fuse_common.h:555
FUSE_CAP_HANDLE_KILLPRIV
#define FUSE_CAP_HANDLE_KILLPRIV
Definition: fuse_common.h:317
fuse_add_direntry_plus
size_t fuse_add_direntry_plus(fuse_req_t req, char *buf, size_t bufsize, const char *name, const struct fuse_entry_param *e, off_t off)
Definition: fuse_lowlevel.c:357
fuse_reply_data
int fuse_reply_data(fuse_req_t req, struct fuse_bufvec *bufv, enum fuse_buf_copy_flags flags)
Definition: fuse_lowlevel.c:820
fuse_file_info::poll_events
uint32_t poll_events
Definition: fuse_common.h:79
fuse_session_fd
int fuse_session_fd(struct fuse_session *se)
Definition: fuse_lowlevel.c:2953
fuse_req_ctx
const struct fuse_ctx * fuse_req_ctx(fuse_req_t req)
Definition: fuse_lowlevel.c:2343
FUSE_BUF_FORCE_SPLICE
Definition: fuse_common.h:597
fuse_session_mount
int fuse_session_mount(struct fuse_session *se, const char *mountpoint)
Definition: fuse_lowlevel.c:2903
FUSE_CAP_ASYNC_READ
#define FUSE_CAP_ASYNC_READ
Definition: fuse_common.h:120
fuse_reply_ioctl_retry
int fuse_reply_ioctl_retry(fuse_req_t req, const struct iovec *in_iov, size_t in_count, const struct iovec *out_iov, size_t out_count)
Definition: fuse_lowlevel.c:909
fuse_opt_parse
int fuse_opt_parse(struct fuse_args *args, void *data, const struct fuse_opt opts[], fuse_opt_proc_t proc)
Definition: fuse_opt.c:397
fuse_interrupt_func_t
void(* fuse_interrupt_func_t)(fuse_req_t req, void *data)
Definition: fuse_lowlevel.h:1760
fuse_lowlevel_notify_poll
int fuse_lowlevel_notify_poll(struct fuse_pollhandle *ph)
Definition: fuse_lowlevel.c:2124
fuse_req_t
struct fuse_req * fuse_req_t
Definition: fuse_lowlevel.h:49
fuse_entry_param::attr
struct stat attr
Definition: fuse_lowlevel.h:91
fuse_add_direntry
size_t fuse_add_direntry(fuse_req_t req, char *buf, size_t bufsize, const char *name, const struct stat *stbuf, off_t off)
Definition: fuse_lowlevel.c:267
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Definition: fuse_common.h:606
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Definition: fuse_common.h:144
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Definition: fuse_common.h:640
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Definition: fuse_common.h:266
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Definition: fuse_common.h:128
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Definition: fuse_common.h:615
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Definition: fuse_lowlevel.h:175
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Definition: fuse_common.h:684
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Definition: fuse_opt.h:77
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Definition: fuse_common.h:137
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Definition: fuse_opt.h:109
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Definition: fuse_common.h:227
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Definition: fuse_common.h:289
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Definition: buffer.c:281
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Definition: fuse_common.h:628
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Definition: fuse_lowlevel.h:103
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Definition: fuse_common.h:579
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Definition: fuse_common.h:647
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Definition: fuse_lowlevel.h:97
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Definition: fuse_lowlevel.c:246
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Definition: fuse_common.h:624
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Definition: fuse_lowlevel.c:446
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Definition: fuse_lowlevel.c:470
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Definition: fuse_common.h:152