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ntfs-3g/libfuse-lite/fuse_lowlevel.c
Jean-Pierre André cf6f265069 Switch to using the standard autoconf AC_HEADER_MAJOR macro 
Switch to the standard autoconf AC_HEADER_MAJOR macro which takes care
of the ugly details like when to use mkdev.h and when to use sysmacros.h.
(requires <sys/types.h> to be included)
Also include these in all files that use major/minor/makedev funcs.

(Contributed by Mike Frysinger)
2016-05-31 08:33:10 +02:00

1461 lines
40 KiB
C
Raw Blame History

/*
FUSE: Filesystem in Userspace
Copyright (C) 2001-2007 Miklos Szeredi <miklos@szeredi.hu>
This program can be distributed under the terms of the GNU LGPLv2.
See the file COPYING.LIB
*/
#include "config.h"
#include "fuse_lowlevel.h"
#include "fuse_kernel.h"
#include "fuse_opt.h"
#include "fuse_i.h"
#include "fuse_misc.h"
#include "fuse_lowlevel_compat.h"
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#include <errno.h>
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef MAJOR_IN_MKDEV
#include <sys/mkdev.h>
#endif
#ifdef MAJOR_IN_SYSMACROS
#include <sys/sysmacros.h>
#endif
#define PARAM(inarg) (((const char *)(inarg)) + sizeof(*(inarg)))
#define OFFSET_MAX 0x7fffffffffffffffLL
struct fuse_ll;
struct fuse_req {
struct fuse_ll *f;
uint64_t unique;
int ctr;
pthread_mutex_t lock;
struct fuse_ctx ctx;
struct fuse_chan *ch;
int interrupted;
union {
struct {
uint64_t unique;
} i;
struct {
fuse_interrupt_func_t func;
void *data;
} ni;
} u;
struct fuse_req *next;
struct fuse_req *prev;
};
struct fuse_ll {
int debug;
int allow_root;
struct fuse_lowlevel_ops op;
int got_init;
void *userdata;
uid_t owner;
struct fuse_conn_info conn;
struct fuse_req list;
struct fuse_req interrupts;
pthread_mutex_t lock;
int got_destroy;
};
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;
#if defined(__SOLARIS__) && defined(_LP64)
/* Must pack the device the old way (attr->rdev limited to 32 bits) */
attr->rdev = ((major(stbuf->st_rdev) & 0x3fff) << 18)
| (minor(stbuf->st_rdev) & 0x3ffff);
#else
attr->rdev = stbuf->st_rdev;
#endif
attr->size = stbuf->st_size;
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);
#ifdef POSIXACLS
attr->filling = 0; /* JPA trying to be safe */
#endif
}
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;
ST_ATIM_NSEC_SET(stbuf, attr->atimensec);
ST_MTIM_NSEC_SET(stbuf, attr->mtimensec);
}
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);
}
static void free_req(fuse_req_t req)
{
int ctr;
struct fuse_ll *f = req->f;
pthread_mutex_lock(&req->lock);
req->u.ni.func = NULL;
req->u.ni.data = NULL;
pthread_mutex_unlock(&req->lock);
pthread_mutex_lock(&f->lock);
list_del_req(req);
ctr = --req->ctr;
pthread_mutex_unlock(&f->lock);
if (!ctr)
destroy_req(req);
}
static int send_reply_iov(fuse_req_t req, int error, struct iovec *iov,
int count)
{
struct fuse_out_header out;
int res;
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);
out.len = iov_length(iov, count);
if (req->f->debug)
fprintf(stderr, " unique: %llu, error: %i (%s), outsize: %i\n",
(unsigned long long) out.unique, out.error,
strerror(-out.error), out.len);
res = fuse_chan_send(req->ch, iov, count);
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) {
/* Note : const qualifier dropped */
iov[1].iov_base = (void *)(uintptr_t) arg;
iov[1].iov_len = argsize;
count++;
}
return send_reply_iov(req, error, iov, count);
}
#if 0 /* not used */
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;
}
#endif
size_t fuse_dirent_size(size_t namelen)
{
return FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + namelen);
}
char *fuse_add_dirent(char *buf, const char *name, const struct stat *stbuf,
off_t off)
{
unsigned namelen = strlen(name);
unsigned entlen = FUSE_NAME_OFFSET + namelen;
unsigned entsize = fuse_dirent_size(namelen);
unsigned padlen = entsize - entlen;
struct fuse_dirent *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);
if (padlen)
memset(buf + entlen, 0, padlen);
return buf + entsize;
}
size_t fuse_add_direntry(fuse_req_t req, char *buf, size_t bufsize,
const char *name, const struct stat *stbuf, off_t off)
{
size_t entsize;
(void) req;
entsize = fuse_dirent_size(strlen(name));
if (entsize <= bufsize && buf)
fuse_add_dirent(buf, name, stbuf, off);
return entsize;
}
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_chan_send(req->ch, NULL, 0);
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)
{
unsigned long secs = calc_timeout_sec(t);
double f = t - (double)secs;
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);
}
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;
}
int fuse_reply_entry(fuse_req_t req, const struct fuse_entry_param *e)
{
struct fuse_entry_out arg;
/* before ABI 7.4 e->ino == 0 was invalid, only ENOENT meant
negative entry */
if (!e->ino && req->f->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, (req->f->conn.proto_minor >= 12
? sizeof(arg) : FUSE_COMPAT_ENTRY_OUT_SIZE));
}
int fuse_reply_create(fuse_req_t req, const struct fuse_entry_param *e,
const struct fuse_file_info *f)
{
struct {
struct fuse_entry_out e;
struct fuse_open_out o;
} arg;
memset(&arg, 0, sizeof(arg));
fill_entry(&arg.e, e);
if (req->f->conn.proto_minor < 12) {
fill_open((struct fuse_open_out*)
((char*)&arg + FUSE_COMPAT_ENTRY_OUT_SIZE), f);
return send_reply_ok(req, &arg,
FUSE_COMPAT_ENTRY_OUT_SIZE + sizeof(struct fuse_open_out));
} else {
fill_open(&arg.o, f);
return send_reply_ok(req, &arg, sizeof(arg));
}
}
int fuse_reply_attr(fuse_req_t req, const struct stat *attr,
double attr_timeout)
{
struct fuse_attr_out 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, (req->f->conn.proto_minor >= 12
? sizeof(arg) : FUSE_COMPAT_FUSE_ATTR_OUT_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);
}
int fuse_reply_statfs(fuse_req_t req, const struct statvfs *stbuf)
{
struct fuse_statfs_out arg;
size_t size = req->f->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, 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));
}
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) {
/* Note : const qualifier dropped */
iov[count].iov_base = (char *)(uintptr_t) buf;
iov[count].iov_len = size;
count++;
}
return send_reply_iov(req, 0, iov, count);
}
static void do_lookup(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
const char *name = (const char *) inarg;
if (req->f->op.lookup)
req->f->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)
{
const struct fuse_forget_in *arg = (const struct fuse_forget_in *) inarg;
if (req->f->op.forget)
req->f->op.forget(req, nodeid, arg->nlookup);
else
fuse_reply_none(req);
}
static void do_getattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
(void) inarg;
if (req->f->op.getattr)
req->f->op.getattr(req, nodeid, NULL);
else
fuse_reply_err(req, ENOSYS);
}
static void do_setattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
const struct fuse_setattr_in *arg = (const struct fuse_setattr_in *) inarg;
if (req->f->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) {
memset(&fi_store, 0, sizeof(fi_store));
fi = &fi_store;
fi->fh = arg->fh;
fi->fh_old = fi->fh;
}
req->f->op.setattr(req, nodeid, &stbuf, arg->valid & ~FATTR_FH, fi);
} else
fuse_reply_err(req, ENOSYS);
}
static void do_access(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
const struct fuse_access_in *arg = (const struct fuse_access_in *) inarg;
if (req->f->op.access)
req->f->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->f->op.readlink)
req->f->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)
{
const struct fuse_mknod_in *arg = (const struct fuse_mknod_in *) inarg;
const char *name = PARAM(arg);
if (req->f->conn.proto_minor >= 12)
req->ctx.umask = arg->umask;
else
name = (const char *) inarg + FUSE_COMPAT_MKNOD_IN_SIZE;
if (req->f->op.mknod) {
#if defined(__SOLARIS__) && defined(_LP64)
/*
* Must unpack the device, as arg->rdev is limited to 32 bits,
* and must have the same format in 32-bit and 64-bit builds.
*/
req->f->op.mknod(req, nodeid, name, arg->mode,
makedev((arg->rdev >> 18) & 0x3fff,
arg->rdev & 0x3ffff));
#else
req->f->op.mknod(req, nodeid, name, arg->mode, arg->rdev);
#endif
} else
fuse_reply_err(req, ENOSYS);
}
static void do_mkdir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
const struct fuse_mkdir_in *arg = (const struct fuse_mkdir_in *) inarg;
if (req->f->conn.proto_minor >= 12)
req->ctx.umask = arg->umask;
if (req->f->op.mkdir)
req->f->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)
{
const char *name = (const char *) inarg;
if (req->f->op.unlink)
req->f->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)
{
const char *name = (const char *) inarg;
if (req->f->op.rmdir)
req->f->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)
{
const char *name = (const char *) inarg;
const char *linkname = ((const char *) inarg) + strlen((const char *) inarg) + 1;
if (req->f->op.symlink)
req->f->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)
{
const struct fuse_rename_in *arg = (const struct fuse_rename_in *) inarg;
const char *oldname = PARAM(arg);
const char *newname = oldname + strlen(oldname) + 1;
if (req->f->op.rename)
req->f->op.rename(req, nodeid, oldname, arg->newdir, newname);
else
fuse_reply_err(req, ENOSYS);
}
static void do_link(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
const struct fuse_link_in *arg = (const struct fuse_link_in *) inarg;
if (req->f->op.link)
req->f->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)
{
const struct fuse_create_in *arg = (const struct fuse_create_in *) inarg;
if (req->f->op.create) {
struct fuse_file_info fi;
const char *name = PARAM(arg);
memset(&fi, 0, sizeof(fi));
fi.flags = arg->flags;
if (req->f->conn.proto_minor >= 12)
req->ctx.umask = arg->umask;
else
name = (const char *) inarg + sizeof(struct fuse_open_in);
req->f->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)
{
const struct fuse_open_in *arg = (const struct fuse_open_in *) inarg;
struct fuse_file_info fi;
memset(&fi, 0, sizeof(fi));
fi.flags = arg->flags;
if (req->f->op.open)
req->f->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)
{
const struct fuse_read_in *arg = (const struct fuse_read_in *) inarg;
if (req->f->op.read) {
struct fuse_file_info fi;
memset(&fi, 0, sizeof(fi));
fi.fh = arg->fh;
fi.fh_old = fi.fh;
req->f->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)
{
const struct fuse_write_in *arg = (const struct fuse_write_in *) inarg;
struct fuse_file_info fi;
memset(&fi, 0, sizeof(fi));
fi.fh = arg->fh;
fi.fh_old = fi.fh;
fi.writepage = arg->write_flags & 1;
if (req->f->op.write) {
const char *buf;
if (req->f->conn.proto_minor >= 12)
buf = PARAM(arg);
else
buf = ((const char*)arg) + FUSE_COMPAT_WRITE_IN_SIZE;
req->f->op.write(req, nodeid, buf, arg->size, arg->offset, &fi);
} else
fuse_reply_err(req, ENOSYS);
}
static void do_flush(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
const struct fuse_flush_in *arg = (const struct fuse_flush_in *) inarg;
struct fuse_file_info fi;
memset(&fi, 0, sizeof(fi));
fi.fh = arg->fh;
fi.fh_old = fi.fh;
fi.flush = 1;
if (req->f->conn.proto_minor >= 7)
fi.lock_owner = arg->lock_owner;
if (req->f->op.flush)
req->f->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)
{
const struct fuse_release_in *arg = (const struct fuse_release_in *) inarg;
struct fuse_file_info fi;
memset(&fi, 0, sizeof(fi));
fi.flags = arg->flags;
fi.fh = arg->fh;
fi.fh_old = fi.fh;
if (req->f->conn.proto_minor >= 8) {
fi.flush = (arg->release_flags & FUSE_RELEASE_FLUSH) ? 1 : 0;
fi.lock_owner = arg->lock_owner;
}
if (req->f->op.release)
req->f->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)
{
const struct fuse_fsync_in *arg = (const struct fuse_fsync_in *) inarg;
struct fuse_file_info fi;
memset(&fi, 0, sizeof(fi));
fi.fh = arg->fh;
fi.fh_old = fi.fh;
if (req->f->op.fsync)
req->f->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)
{
const struct fuse_open_in *arg = (const struct fuse_open_in *) inarg;
struct fuse_file_info fi;
memset(&fi, 0, sizeof(fi));
fi.flags = arg->flags;
if (req->f->op.opendir)
req->f->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)
{
const struct fuse_read_in *arg = (const struct fuse_read_in *) inarg;
struct fuse_file_info fi;
memset(&fi, 0, sizeof(fi));
fi.fh = arg->fh;
fi.fh_old = fi.fh;
if (req->f->op.readdir)
req->f->op.readdir(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)
{
const struct fuse_release_in *arg = (const struct fuse_release_in *) inarg;
struct fuse_file_info fi;
memset(&fi, 0, sizeof(fi));
fi.flags = arg->flags;
fi.fh = arg->fh;
fi.fh_old = fi.fh;
if (req->f->op.releasedir)
req->f->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)
{
const struct fuse_fsync_in *arg = (const struct fuse_fsync_in *) inarg;
struct fuse_file_info fi;
memset(&fi, 0, sizeof(fi));
fi.fh = arg->fh;
fi.fh_old = fi.fh;
if (req->f->op.fsyncdir)
req->f->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->f->op.statfs)
req->f->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)
{
const struct fuse_setxattr_in *arg = (const struct fuse_setxattr_in *) inarg;
const char *name = PARAM(arg);
const char *value = name + strlen(name) + 1;
if (req->f->op.setxattr)
req->f->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)
{
const struct fuse_getxattr_in *arg = (const struct fuse_getxattr_in *) inarg;
if (req->f->op.getxattr)
req->f->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)
{
const struct fuse_getxattr_in *arg = (const struct fuse_getxattr_in *) inarg;
if (req->f->op.listxattr)
req->f->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)
{
const char *name = (const char *) inarg;
if (req->f->op.removexattr)
req->f->op.removexattr(req, nodeid, name);
else
fuse_reply_err(req, ENOSYS);
}
static void convert_fuse_file_lock(const 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)
{
const struct fuse_lk_in *arg = (const 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->f->op.getlk)
req->f->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 should_sleep)
{
const struct fuse_lk_in *arg = (const 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->f->op.setlk)
req->f->op.setlk(req, nodeid, &fi, &flock, should_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_ll *f, struct fuse_req *req)
{
struct fuse_req *curr;
for (curr = f->list.next; curr != &f->list; curr = curr->next) {
if (curr->unique == req->u.i.unique) {
curr->ctr++;
pthread_mutex_unlock(&f->lock);
/* Ugh, ugly locking */
pthread_mutex_lock(&curr->lock);
pthread_mutex_lock(&f->lock);
curr->interrupted = 1;
pthread_mutex_unlock(&f->lock);
if (curr->u.ni.func)
curr->u.ni.func(curr, curr->u.ni.data);
pthread_mutex_unlock(&curr->lock);
pthread_mutex_lock(&f->lock);
curr->ctr--;
if (!curr->ctr)
destroy_req(curr);
return 1;
}
}
for (curr = f->interrupts.next; curr != &f->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)
{
const struct fuse_interrupt_in *arg = (const struct fuse_interrupt_in *) inarg;
struct fuse_ll *f = req->f;
(void) nodeid;
if (f->debug)
fprintf(stderr, "INTERRUPT: %llu\n", (unsigned long long) arg->unique);
req->u.i.unique = arg->unique;
pthread_mutex_lock(&f->lock);
if (find_interrupted(f, req))
destroy_req(req);
else
list_add_req(req, &f->interrupts);
pthread_mutex_unlock(&f->lock);
}
static struct fuse_req *check_interrupt(struct fuse_ll *f, struct fuse_req *req)
{
struct fuse_req *curr;
for (curr = f->interrupts.next; curr != &f->interrupts; curr = curr->next) {
if (curr->u.i.unique == req->unique) {
req->interrupted = 1;
list_del_req(curr);
free(curr);
return NULL;
}
}
curr = f->interrupts.next;
if (curr != &f->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)
{
const struct fuse_bmap_in *arg = (const struct fuse_bmap_in *) inarg;
if (req->f->op.bmap)
req->f->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)
{
const struct fuse_ioctl_in *arg = (const struct fuse_ioctl_in *) inarg;
unsigned int flags = arg->flags;
const void *in_buf = arg->in_size ? PARAM(arg) : NULL;
struct fuse_file_info fi;
if (flags & FUSE_IOCTL_DIR &&
!(req->f->conn.want & FUSE_CAP_IOCTL_DIR)) {
fuse_reply_err(req, ENOTTY);
return;
}
memset(&fi, 0, sizeof(fi));
fi.fh = arg->fh;
/* TODO JPA (need req->ioctl_64bit in obscure fuse_req_t)
// probably a 64 bit ioctl on a 32-bit cpu
// this is to forward a request from the kernel
if (sizeof(void *) == 4 && req->f->conn.proto_minor >= 16 &&
!(flags & FUSE_IOCTL_32BIT)) {
req->ioctl_64bit = 1;
}
*/
if (req->f->op.ioctl)
req->f->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);
}
static void do_init(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
const struct fuse_init_in *arg = (const struct fuse_init_in *) inarg;
struct fuse_init_out outarg;
struct fuse_ll *f = req->f;
size_t bufsize = fuse_chan_bufsize(req->ch);
(void) nodeid;
if (f->debug) {
fprintf(stderr, "INIT: %u.%u\n", arg->major, arg->minor);
if (arg->major > 7 || (arg->major == 7 && arg->minor >= 6)) {
fprintf(stderr, "flags=0x%08x\n", arg->flags);
fprintf(stderr, "max_readahead=0x%08x\n", arg->max_readahead);
}
}
f->conn.proto_major = arg->major;
f->conn.proto_minor = arg->minor;
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 || (arg->major == 7 && arg->minor >= 6)) {
if (f->conn.async_read)
f->conn.async_read = arg->flags & FUSE_ASYNC_READ;
if (arg->max_readahead < f->conn.max_readahead)
f->conn.max_readahead = arg->max_readahead;
#ifdef POSIXACLS
if (arg->flags & FUSE_DONT_MASK)
f->conn.capable |= FUSE_CAP_DONT_MASK;
#endif
if (arg->flags & FUSE_BIG_WRITES)
f->conn.capable |= FUSE_CAP_BIG_WRITES;
if (arg->flags & FUSE_HAS_IOCTL_DIR)
f->conn.capable |= FUSE_CAP_IOCTL_DIR;
} else {
f->conn.async_read = 0;
f->conn.max_readahead = 0;
}
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 < f->conn.max_write)
f->conn.max_write = bufsize;
f->got_init = 1;
if (f->op.init)
f->op.init(f->userdata, &f->conn);
memset(&outarg, 0, sizeof(outarg));
outarg.major = FUSE_KERNEL_VERSION;
/*
* Suggest using protocol 7.18 when available, and fallback
* to 7.12 or even earlier when running on an old kernel.
* Protocol 7.12 has the ability to process the umask
* conditionnally (as needed if POSIXACLS is set)
* Protocol 7.18 has the ability to process the ioctls
*/
if (arg->major > 7 || (arg->major == 7 && arg->minor >= 18)) {
outarg.minor = FUSE_KERNEL_MINOR_VERSION;
if (f->conn.want & FUSE_CAP_IOCTL_DIR)
outarg.flags |= FUSE_HAS_IOCTL_DIR;
#ifdef POSIXACLS
if (f->conn.want & FUSE_CAP_DONT_MASK)
outarg.flags |= FUSE_DONT_MASK;
#endif
} else {
/* Never use a version more recent than supported by the kernel */
if ((arg->major < FUSE_KERNEL_MAJOR_FALLBACK)
|| ((arg->major == FUSE_KERNEL_MAJOR_FALLBACK)
&& (arg->minor < FUSE_KERNEL_MINOR_FALLBACK))) {
outarg.major = arg->major;
outarg.minor = arg->minor;
} else {
outarg.major = FUSE_KERNEL_MAJOR_FALLBACK;
outarg.minor = FUSE_KERNEL_MINOR_FALLBACK;
#ifdef POSIXACLS
if (f->conn.want & FUSE_CAP_DONT_MASK)
outarg.flags |= FUSE_DONT_MASK;
#endif
}
}
if (f->conn.async_read)
outarg.flags |= FUSE_ASYNC_READ;
if (f->op.getlk && f->op.setlk)
outarg.flags |= FUSE_POSIX_LOCKS;
if (f->conn.want & FUSE_CAP_BIG_WRITES)
outarg.flags |= FUSE_BIG_WRITES;
outarg.max_readahead = f->conn.max_readahead;
outarg.max_write = f->conn.max_write;
if (f->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);
}
send_reply_ok(req, &outarg, arg->minor < 5 ? 8 : sizeof(outarg));
}
static void do_destroy(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
struct fuse_ll *f = req->f;
(void) nodeid;
(void) inarg;
f->got_destroy = 1;
if (f->op.destroy)
f->op.destroy(f->userdata);
send_reply_ok(req, NULL, 0);
}
void *fuse_req_userdata(fuse_req_t req)
{
return req->f->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);
req->u.ni.func = func;
req->u.ni.data = data;
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->f->lock);
interrupted = req->interrupted;
pthread_mutex_unlock(&req->f->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_DESTROY] = { do_destroy, "DESTROY" },
};
#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 void fuse_ll_process(void *data, const char *buf, size_t len,
struct fuse_chan *ch)
{
struct fuse_ll *f = (struct fuse_ll *) data;
const struct fuse_in_header *in = (const struct fuse_in_header *) buf;
const void *inarg = buf + sizeof(struct fuse_in_header);
struct fuse_req *req;
if (f->debug)
fprintf(stderr, "unique: %llu, opcode: %s (%i), nodeid: %lu, insize: %zu\n",
(unsigned long long) in->unique,
opname((enum fuse_opcode) in->opcode), in->opcode,
(unsigned long) in->nodeid, len);
req = (struct fuse_req *) calloc(1, sizeof(struct fuse_req));
if (req == NULL) {
fprintf(stderr, "fuse: failed to allocate request\n");
return;
}
req->f = f;
req->unique = in->unique;
req->ctx.uid = in->uid;
req->ctx.gid = in->gid;
req->ctx.pid = in->pid;
req->ch = ch;
req->ctr = 1;
list_init_req(req);
fuse_mutex_init(&req->lock);
if (!f->got_init && in->opcode != FUSE_INIT)
fuse_reply_err(req, EIO);
else if (f->allow_root && in->uid != f->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) {
fuse_reply_err(req, EACCES);
} else if (in->opcode >= FUSE_MAXOP || !fuse_ll_ops[in->opcode].func)
fuse_reply_err(req, ENOSYS);
else {
if (in->opcode != FUSE_INTERRUPT) {
struct fuse_req *intr;
pthread_mutex_lock(&f->lock);
intr = check_interrupt(f, req);
list_add_req(req, &f->list);
pthread_mutex_unlock(&f->lock);
if (intr)
fuse_reply_err(intr, EAGAIN);
}
fuse_ll_ops[in->opcode].func(req, in->nodeid, inarg);
}
}
enum {
KEY_HELP,
KEY_VERSION,
};
static struct fuse_opt fuse_ll_opts[] = {
{ "debug", offsetof(struct fuse_ll, debug), 1 },
{ "-d", offsetof(struct fuse_ll, debug), 1 },
{ "allow_root", offsetof(struct fuse_ll, allow_root), 1 },
{ "max_write=%u", offsetof(struct fuse_ll, conn.max_write), 0 },
{ "max_readahead=%u", offsetof(struct fuse_ll, conn.max_readahead), 0 },
{ "async_read", offsetof(struct fuse_ll, conn.async_read), 1 },
{ "sync_read", offsetof(struct fuse_ll, conn.async_read), 0 },
FUSE_OPT_KEY("max_read=", FUSE_OPT_KEY_DISCARD),
FUSE_OPT_KEY("-h", KEY_HELP),
FUSE_OPT_KEY("--help", KEY_HELP),
FUSE_OPT_KEY("-V", KEY_VERSION),
FUSE_OPT_KEY("--version", KEY_VERSION),
FUSE_OPT_END
};
static void fuse_ll_version(void)
{
fprintf(stderr, "using FUSE kernel interface version %i.%i\n",
FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION);
}
static void fuse_ll_help(void)
{
fprintf(stderr,
" -o max_write=N set maximum size of write requests\n"
" -o max_readahead=N set maximum readahead\n"
" -o async_read perform reads asynchronously (default)\n"
" -o sync_read perform reads synchronously\n");
}
static int fuse_ll_opt_proc(void *data, const char *arg, int key,
struct fuse_args *outargs)
{
(void) data; (void) outargs;
switch (key) {
case KEY_HELP:
fuse_ll_help();
break;
case KEY_VERSION:
fuse_ll_version();
break;
default:
fprintf(stderr, "fuse: unknown option `%s'\n", arg);
}
return -1;
}
#ifdef __SOLARIS__
int fuse_lowlevel_is_lib_option(const char *opt)
{
return fuse_opt_match(fuse_ll_opts, opt);
}
#endif /* __SOLARIS__ */
static void fuse_ll_destroy(void *data)
{
struct fuse_ll *f = (struct fuse_ll *) data;
if (f->got_init && !f->got_destroy) {
if (f->op.destroy)
f->op.destroy(f->userdata);
}
pthread_mutex_destroy(&f->lock);
free(f);
}
struct fuse_session *fuse_lowlevel_new(struct fuse_args *args,
const struct fuse_lowlevel_ops *op,
size_t op_size, void *userdata)
{
struct fuse_ll *f;
struct fuse_session *se;
struct fuse_session_ops sop = {
.process = fuse_ll_process,
.destroy = fuse_ll_destroy,
};
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);
}
f = (struct fuse_ll *) calloc(1, sizeof(struct fuse_ll));
if (f == NULL) {
fprintf(stderr, "fuse: failed to allocate fuse object\n");
goto out;
}
f->conn.async_read = 1;
f->conn.max_write = UINT_MAX;
f->conn.max_readahead = UINT_MAX;
list_init_req(&f->list);
list_init_req(&f->interrupts);
fuse_mutex_init(&f->lock);
if (fuse_opt_parse(args, f, fuse_ll_opts, fuse_ll_opt_proc) == -1)
goto out_free;
memcpy(&f->op, op, op_size);
f->owner = getuid();
f->userdata = userdata;
se = fuse_session_new(&sop, f);
if (!se)
goto out_free;
return se;
out_free:
free(f);
out:
return NULL;
}
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