diff options
Diffstat (limited to 'tools/virtiofsd/fuse_lowlevel.c')
| -rw-r--r-- | tools/virtiofsd/fuse_lowlevel.c | 2732 |
1 files changed, 0 insertions, 2732 deletions
diff --git a/tools/virtiofsd/fuse_lowlevel.c b/tools/virtiofsd/fuse_lowlevel.c deleted file mode 100644 index 194a1b813b..0000000000 --- a/tools/virtiofsd/fuse_lowlevel.c +++ /dev/null @@ -1,2732 +0,0 @@ -/* - * 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 - */ - -#include "qemu/osdep.h" -#include "fuse_i.h" -#include "standard-headers/linux/fuse.h" -#include "fuse_misc.h" -#include "fuse_opt.h" -#include "fuse_virtio.h" - -#include <sys/file.h> - -#define THREAD_POOL_SIZE 0 - -#define OFFSET_MAX 0x7fffffffffffffffLL - -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 = (struct fuse_attr){ - .ino = stbuf->st_ino, - .mode = stbuf->st_mode, - .nlink = stbuf->st_nlink, - .uid = stbuf->st_uid, - .gid = stbuf->st_gid, - .rdev = stbuf->st_rdev, - .size = stbuf->st_size, - .blksize = stbuf->st_blksize, - .blocks = stbuf->st_blocks, - .atime = stbuf->st_atime, - .mtime = stbuf->st_mtime, - .ctime = stbuf->st_ctime, - .atimensec = ST_ATIM_NSEC(stbuf), - .mtimensec = ST_MTIM_NSEC(stbuf), - .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); - g_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; - 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 = g_try_new0(struct fuse_req, 1); - if (req == NULL) { - fuse_log(FUSE_LOG_ERR, "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 (out->unique == 0) { - fuse_log(FUSE_LOG_DEBUG, "NOTIFY: code=%d length=%u\n", out->error, - out->len); - } else if (out->error) { - fuse_log(FUSE_LOG_DEBUG, - " unique: %llu, error: %i (%s), outsize: %i\n", - (unsigned long long)out->unique, out->error, - strerror(-out->error), out->len); - } else { - fuse_log(FUSE_LOG_DEBUG, " unique: %llu, success, outsize: %i\n", - (unsigned long long)out->unique, out->len); - } - - if (fuse_lowlevel_is_virtio(se)) { - return virtio_send_msg(se, ch, iov, count); - } - - abort(); /* virtio should have taken it before here */ - return 0; -} - - -int fuse_send_reply_iov_nofree(fuse_req_t req, int error, struct iovec *iov, - int count) -{ - struct fuse_out_header out = { - .unique = req->unique, - .error = error, - }; - - if (error <= -1000 || error > 0) { - fuse_log(FUSE_LOG_ERR, "fuse: bad error value: %i\n", error); - out.error = -ERANGE; - } - - 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) -{ - g_autofree struct iovec *padded_iov = NULL; - - padded_iov = g_try_new(struct iovec, count + 1); - if (padded_iov == NULL) { - return fuse_reply_err(req, ENOMEM); - } - - memcpy(padded_iov + 1, iov, count * sizeof(struct iovec)); - count++; - - return send_reply_iov(req, 0, padded_iov, count); -} - - -/* - * '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 & S_IFMT) >> 12; - memcpy(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 = (struct fuse_kstatfs){ - .bsize = stbuf->f_bsize, - .frsize = stbuf->f_frsize, - .blocks = stbuf->f_blocks, - .bfree = stbuf->f_bfree, - .bavail = stbuf->f_bavail, - .files = stbuf->f_files, - .ffree = stbuf->f_ffree, - .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 = (struct fuse_entry_out){ - .nodeid = e->ino, - .generation = e->generation, - .entry_valid = calc_timeout_sec(e->entry_timeout), - .entry_valid_nsec = calc_timeout_nsec(e->entry_timeout), - .attr_valid = calc_timeout_sec(e->attr_timeout), - .attr_valid_nsec = calc_timeout_nsec(e->attr_timeout), - }; - convert_stat(&e->attr, &arg->attr); - - arg->attr.flags = e->attr_flags; -} - -/* - * `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 = (struct fuse_dirent){ - .ino = e->attr.st_ino, - .off = off, - .namelen = namelen, - .type = (e->attr.st_mode & S_IFMT) >> 12, - }; - memcpy(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->cache_readdir) { - arg->open_flags |= FOPEN_CACHE_DIR; - } - 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 = sizeof(arg); - - 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 = 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 = 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) -{ - /* 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); - } - - if (fuse_lowlevel_is_virtio(se) && buf->count == 1 && - buf->buf[0].flags == (FUSE_BUF_IS_FD | FUSE_BUF_FD_SEEK)) { - return virtio_send_data_iov(se, ch, iov, iov_count, buf, len); - } - - abort(); /* Will have taken vhost path */ - 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) -{ - size_t len = fuse_buf_size(buf); - - return fuse_send_data_iov_fallback(se, ch, iov, iov_count, buf, len); -} - -int fuse_reply_data(fuse_req_t req, struct fuse_bufvec *bufv) -{ - struct iovec iov[2]; - struct fuse_out_header out = { - .unique = req->unique, - }; - int res; - - iov[0].iov_base = &out; - iov[0].iov_len = sizeof(struct fuse_out_header); - - res = fuse_send_data_iov(req->se, req->ch, iov, 1, bufv); - 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 = 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 = g_try_new(struct fuse_ioctl_iovec, 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; - g_autofree struct fuse_ioctl_iovec *in_fiov = NULL; - g_autofree struct fuse_ioctl_iovec *out_fiov = NULL; - struct iovec iov[4]; - size_t count = 1; - - 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++; - - /* Can't handle non-compat 64bit ioctls on 32bit */ - if (sizeof(void *) == 4 && req->ioctl_64bit) { - return fuse_reply_err(req, EINVAL); - } - - if (in_count) { - in_fiov = fuse_ioctl_iovec_copy(in_iov, in_count); - if (!in_fiov) { - return fuse_reply_err(req, 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) { - return fuse_reply_err(req, ENOMEM); - } - - iov[count].iov_base = (void *)out_fiov; - iov[count].iov_len = sizeof(out_fiov[0]) * out_count; - count++; - } - - return send_reply_iov(req, 0, iov, count); -} - -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) -{ - g_autofree struct iovec *padded_iov = NULL; - struct fuse_ioctl_out arg; - - padded_iov = g_try_new(struct iovec, count + 2); - 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)); - - return send_reply_iov(req, 0, padded_iov, count + 2); -} - -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)); -} - -int fuse_reply_lseek(fuse_req_t req, off_t off) -{ - struct fuse_lseek_out arg; - - memset(&arg, 0, sizeof(arg)); - arg.offset = off; - - return send_reply_ok(req, &arg, sizeof(arg)); -} - -static void do_lookup(fuse_req_t req, fuse_ino_t nodeid, - struct fuse_mbuf_iter *iter) -{ - const char *name = fuse_mbuf_iter_advance_str(iter); - if (!name) { - fuse_reply_err(req, EINVAL); - return; - } - - 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, - struct fuse_mbuf_iter *iter) -{ - struct fuse_forget_in *arg; - - arg = fuse_mbuf_iter_advance(iter, sizeof(*arg)); - if (!arg) { - fuse_reply_err(req, EINVAL); - return; - } - - 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, - struct fuse_mbuf_iter *iter) -{ - struct fuse_batch_forget_in *arg; - struct fuse_forget_data *forgets; - size_t scount; - - (void)nodeid; - - arg = fuse_mbuf_iter_advance(iter, sizeof(*arg)); - if (!arg) { - fuse_reply_none(req); - return; - } - - /* - * Prevent integer overflow. The compiler emits the following warning - * unless we use the scount local variable: - * - * error: comparison is always false due to limited range of data type - * [-Werror=type-limits] - * - * This may be true on 64-bit hosts but we need this check for 32-bit - * hosts. - */ - scount = arg->count; - if (scount > SIZE_MAX / sizeof(forgets[0])) { - fuse_reply_none(req); - return; - } - - forgets = fuse_mbuf_iter_advance(iter, arg->count * sizeof(forgets[0])); - if (!forgets) { - fuse_reply_none(req); - return; - } - - if (req->se->op.forget_multi) { - req->se->op.forget_multi(req, arg->count, forgets); - } else if (req->se->op.forget) { - unsigned int i; - - for (i = 0; i < arg->count; 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, forgets[i].ino, forgets[i].nlookup); - } - fuse_reply_none(req); - } else { - fuse_reply_none(req); - } -} - -static void do_getattr(fuse_req_t req, fuse_ino_t nodeid, - struct fuse_mbuf_iter *iter) -{ - struct fuse_file_info *fip = NULL; - struct fuse_file_info fi; - - struct fuse_getattr_in *arg; - - arg = fuse_mbuf_iter_advance(iter, sizeof(*arg)); - if (!arg) { - fuse_reply_err(req, EINVAL); - return; - } - - 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, - struct fuse_mbuf_iter *iter) -{ - if (req->se->op.setattr) { - struct fuse_setattr_in *arg; - struct fuse_file_info *fi = NULL; - struct fuse_file_info fi_store; - struct stat stbuf; - - arg = fuse_mbuf_iter_advance(iter, sizeof(*arg)); - if (!arg) { - fuse_reply_err(req, EINVAL); - return; - } - - 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 | FUSE_SET_ATTR_KILL_SUIDGID; - - 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, - struct fuse_mbuf_iter *iter) -{ - struct fuse_access_in *arg; - - arg = fuse_mbuf_iter_advance(iter, sizeof(*arg)); - if (!arg) { - fuse_reply_err(req, EINVAL); - return; - } - - 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, - struct fuse_mbuf_iter *iter) -{ - (void)iter; - - if (req->se->op.readlink) { - req->se->op.readlink(req, nodeid); - } else { - fuse_reply_err(req, ENOSYS); - } -} - -static int parse_secctx_fill_req(fuse_req_t req, struct fuse_mbuf_iter *iter) -{ - struct fuse_secctx_header *fsecctx_header; - struct fuse_secctx *fsecctx; - const void *secctx; - const char *name; - - fsecctx_header = fuse_mbuf_iter_advance(iter, sizeof(*fsecctx_header)); - if (!fsecctx_header) { - return -EINVAL; - } - - /* - * As of now maximum of one security context is supported. It can - * change in future though. - */ - if (fsecctx_header->nr_secctx > 1) { - return -EINVAL; - } - - /* No security context sent. Maybe no LSM supports it */ - if (!fsecctx_header->nr_secctx) { - return 0; - } - - fsecctx = fuse_mbuf_iter_advance(iter, sizeof(*fsecctx)); - if (!fsecctx) { - return -EINVAL; - } - - /* struct fsecctx with zero sized context is not expected */ - if (!fsecctx->size) { - return -EINVAL; - } - name = fuse_mbuf_iter_advance_str(iter); - if (!name) { - return -EINVAL; - } - - secctx = fuse_mbuf_iter_advance(iter, fsecctx->size); - if (!secctx) { - return -EINVAL; - } - - req->secctx.name = name; - req->secctx.ctx = secctx; - req->secctx.ctxlen = fsecctx->size; - return 0; -} - -static void do_mknod(fuse_req_t req, fuse_ino_t nodeid, - struct fuse_mbuf_iter *iter) -{ - struct fuse_mknod_in *arg; - const char *name; - bool secctx_enabled = req->se->conn.want & FUSE_CAP_SECURITY_CTX; - int err; - - arg = fuse_mbuf_iter_advance(iter, sizeof(*arg)); - name = fuse_mbuf_iter_advance_str(iter); - if (!arg || !name) { - fuse_reply_err(req, EINVAL); - return; - } - - req->ctx.umask = arg->umask; - - if (secctx_enabled) { - err = parse_secctx_fill_req(req, iter); - if (err) { - fuse_reply_err(req, -err); - return; - } - } - - 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, - struct fuse_mbuf_iter *iter) -{ - struct fuse_mkdir_in *arg; - const char *name; - bool secctx_enabled = req->se->conn.want & FUSE_CAP_SECURITY_CTX; - int err; - - arg = fuse_mbuf_iter_advance(iter, sizeof(*arg)); - name = fuse_mbuf_iter_advance_str(iter); - if (!arg || !name) { - fuse_reply_err(req, EINVAL); - return; - } - - req->ctx.umask = arg->umask; - - if (secctx_enabled) { - err = parse_secctx_fill_req(req, iter); - if (err) { - fuse_reply_err(req, err); - return; - } - } - - if (req->se->op.mkdir) { - req->se->op.mkdir(req, nodeid, name, arg->mode); - } else { - fuse_reply_err(req, ENOSYS); - } -} - -static void do_unlink(fuse_req_t req, fuse_ino_t nodeid, - struct fuse_mbuf_iter *iter) -{ - const char *name = fuse_mbuf_iter_advance_str(iter); - - if (!name) { - fuse_reply_err(req, EINVAL); - return; - } - - 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, - struct fuse_mbuf_iter *iter) -{ - const char *name = fuse_mbuf_iter_advance_str(iter); - - if (!name) { - fuse_reply_err(req, EINVAL); - return; - } - - 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, - struct fuse_mbuf_iter *iter) -{ - const char *name = fuse_mbuf_iter_advance_str(iter); - const char *linkname = fuse_mbuf_iter_advance_str(iter); - bool secctx_enabled = req->se->conn.want & FUSE_CAP_SECURITY_CTX; - int err; - - if (!name || !linkname) { - fuse_reply_err(req, EINVAL); - return; - } - - if (secctx_enabled) { - err = parse_secctx_fill_req(req, iter); - if (err) { - fuse_reply_err(req, err); - return; - } - } - - 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, - struct fuse_mbuf_iter *iter) -{ - struct fuse_rename_in *arg; - const char *oldname; - const char *newname; - - arg = fuse_mbuf_iter_advance(iter, sizeof(*arg)); - oldname = fuse_mbuf_iter_advance_str(iter); - newname = fuse_mbuf_iter_advance_str(iter); - if (!arg || !oldname || !newname) { - fuse_reply_err(req, EINVAL); - return; - } - - 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, - struct fuse_mbuf_iter *iter) -{ - struct fuse_rename2_in *arg; - const char *oldname; - const char *newname; - - arg = fuse_mbuf_iter_advance(iter, sizeof(*arg)); - oldname = fuse_mbuf_iter_advance_str(iter); - newname = fuse_mbuf_iter_advance_str(iter); - if (!arg || !oldname || !newname) { - fuse_reply_err(req, EINVAL); - return; - } - - 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, - struct fuse_mbuf_iter *iter) -{ - struct fuse_link_in *arg = fuse_mbuf_iter_advance(iter, sizeof(*arg)); - const char *name = fuse_mbuf_iter_advance_str(iter); - - if (!arg || !name) { - fuse_reply_err(req, EINVAL); - return; - } - - if (req->se->op.link) { - req->se->op.link(req, arg->oldnodeid, nodeid, name); - } else { - fuse_reply_err(req, ENOSYS); - } -} - -static void do_create(fuse_req_t req, fuse_ino_t nodeid, - struct fuse_mbuf_iter *iter) -{ - bool secctx_enabled = req->se->conn.want & FUSE_CAP_SECURITY_CTX; - - if (req->se->op.create) { - struct fuse_create_in *arg; - struct fuse_file_info fi; - const char *name; - - arg = fuse_mbuf_iter_advance(iter, sizeof(*arg)); - name = fuse_mbuf_iter_advance_str(iter); - if (!arg || !name) { - fuse_reply_err(req, EINVAL); - return; - } - - if (secctx_enabled) { - int err; - err = parse_secctx_fill_req(req, iter); - if (err) { - fuse_reply_err(req, err); - return; - } - } - - memset(&fi, 0, sizeof(fi)); - fi.flags = arg->flags; - fi.kill_priv = arg->open_flags & FUSE_OPEN_KILL_SUIDGID; - - req->ctx.umask = arg->umask; - - 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, - struct fuse_mbuf_iter *iter) -{ - struct fuse_open_in *arg; - struct fuse_file_info fi; - - arg = fuse_mbuf_iter_advance(iter, sizeof(*arg)); - if (!arg) { - fuse_reply_err(req, EINVAL); - return; - } - - /* File creation is handled by do_create() or do_mknod() */ - if (arg->flags & (O_CREAT | O_TMPFILE)) { - fuse_reply_err(req, EINVAL); - return; - } - - memset(&fi, 0, sizeof(fi)); - fi.flags = arg->flags; - fi.kill_priv = arg->open_flags & FUSE_OPEN_KILL_SUIDGID; - - 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, - struct fuse_mbuf_iter *iter) -{ - if (req->se->op.read) { - struct fuse_read_in *arg; - struct fuse_file_info fi; - - arg = fuse_mbuf_iter_advance(iter, sizeof(*arg)); - if (!arg) { - fuse_reply_err(req, EINVAL); - return; - } - - memset(&fi, 0, sizeof(fi)); - fi.fh = arg->fh; - 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, - struct fuse_mbuf_iter *iter) -{ - struct fuse_write_in *arg; - struct fuse_file_info fi; - const char *param; - - arg = fuse_mbuf_iter_advance(iter, sizeof(*arg)); - if (!arg) { - fuse_reply_err(req, EINVAL); - return; - } - - param = fuse_mbuf_iter_advance(iter, arg->size); - if (!param) { - fuse_reply_err(req, EINVAL); - return; - } - - memset(&fi, 0, sizeof(fi)); - fi.fh = arg->fh; - fi.writepage = (arg->write_flags & FUSE_WRITE_CACHE) != 0; - fi.kill_priv = !!(arg->write_flags & FUSE_WRITE_KILL_PRIV); - - fi.lock_owner = arg->lock_owner; - fi.flags = arg->flags; - - 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, - struct fuse_mbuf_iter *iter, struct fuse_bufvec *ibufv) -{ - struct fuse_session *se = req->se; - struct fuse_bufvec *pbufv = ibufv; - struct fuse_bufvec tmpbufv = { - .buf[0] = ibufv->buf[0], - .count = 1, - }; - struct fuse_write_in *arg; - size_t arg_size = sizeof(*arg); - struct fuse_file_info fi; - - memset(&fi, 0, sizeof(fi)); - - arg = fuse_mbuf_iter_advance(iter, arg_size); - if (!arg) { - fuse_reply_err(req, EINVAL); - return; - } - - fi.lock_owner = arg->lock_owner; - fi.flags = arg->flags; - fi.fh = arg->fh; - fi.writepage = !!(arg->write_flags & FUSE_WRITE_CACHE); - fi.kill_priv = !!(arg->write_flags & FUSE_WRITE_KILL_PRIV); - - if (ibufv->count == 1) { - assert(!(tmpbufv.buf[0].flags & FUSE_BUF_IS_FD)); - tmpbufv.buf[0].mem = ((char *)arg) + arg_size; - tmpbufv.buf[0].size -= sizeof(struct fuse_in_header) + arg_size; - pbufv = &tmpbufv; - } else { - /* - * Input bufv contains the headers in the first element - * and the data in the rest, we need to skip that first element - */ - ibufv->buf[0].size = 0; - } - - if (fuse_buf_size(pbufv) != arg->size) { - fuse_log(FUSE_LOG_ERR, - "fuse: do_write_buf: buffer size doesn't match arg->size\n"); - fuse_reply_err(req, EIO); - return; - } - - se->op.write_buf(req, nodeid, pbufv, arg->offset, &fi); -} - -static void do_flush(fuse_req_t req, fuse_ino_t nodeid, - struct fuse_mbuf_iter *iter) -{ - struct fuse_flush_in *arg; - struct fuse_file_info fi; - - arg = fuse_mbuf_iter_advance(iter, sizeof(*arg)); - if (!arg) { - fuse_reply_err(req, EINVAL); - return; - } - - memset(&fi, 0, sizeof(fi)); - fi.fh = arg->fh; - fi.flush = 1; - 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, - struct fuse_mbuf_iter *iter) -{ - struct fuse_release_in *arg; - struct fuse_file_info fi; - - arg = fuse_mbuf_iter_advance(iter, sizeof(*arg)); - if (!arg) { - fuse_reply_err(req, EINVAL); - return; - } - - memset(&fi, 0, sizeof(fi)); - fi.flags = arg->flags; - fi.fh = arg->fh; - 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; - } - - 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, - struct fuse_mbuf_iter *iter) -{ - struct fuse_fsync_in *arg; - struct fuse_file_info fi; - int datasync; - - arg = fuse_mbuf_iter_advance(iter, sizeof(*arg)); - if (!arg) { - fuse_reply_err(req, EINVAL); - return; - } - datasync = arg->fsync_flags & 1; - - memset(&fi, 0, sizeof(fi)); - fi.fh = arg->fh; - - if (req->se->op.fsync) { - if (fi.fh == (uint64_t)-1) { - req->se->op.fsync(req, nodeid, datasync, NULL); - } else { - req->se->op.fsync(req, nodeid, datasync, &fi); - } - } else { - fuse_reply_err(req, ENOSYS); - } -} - -static void do_opendir(fuse_req_t req, fuse_ino_t nodeid, - struct fuse_mbuf_iter *iter) -{ - struct fuse_open_in *arg; - struct fuse_file_info fi; - - arg = fuse_mbuf_iter_advance(iter, sizeof(*arg)); - if (!arg) { - fuse_reply_err(req, EINVAL); - return; - } - - 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, - struct fuse_mbuf_iter *iter) -{ - struct fuse_read_in *arg; - struct fuse_file_info fi; - - arg = fuse_mbuf_iter_advance(iter, sizeof(*arg)); - if (!arg) { - fuse_reply_err(req, EINVAL); - return; - } - - 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, - struct fuse_mbuf_iter *iter) -{ - struct fuse_read_in *arg; - struct fuse_file_info fi; - - arg = fuse_mbuf_iter_advance(iter, sizeof(*arg)); - if (!arg) { - fuse_reply_err(req, EINVAL); - return; - } - - 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, - struct fuse_mbuf_iter *iter) -{ - struct fuse_release_in *arg; - struct fuse_file_info fi; - - arg = fuse_mbuf_iter_advance(iter, sizeof(*arg)); - if (!arg) { - fuse_reply_err(req, EINVAL); - return; - } - - 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, - struct fuse_mbuf_iter *iter) -{ - struct fuse_fsync_in *arg; - struct fuse_file_info fi; - int datasync; - - arg = fuse_mbuf_iter_advance(iter, sizeof(*arg)); - if (!arg) { - fuse_reply_err(req, EINVAL); - return; - } - datasync = arg->fsync_flags & 1; - - memset(&fi, 0, sizeof(fi)); - fi.fh = arg->fh; - - if (req->se->op.fsyncdir) { - req->se->op.fsyncdir(req, nodeid, datasync, &fi); - } else { - fuse_reply_err(req, ENOSYS); - } -} - -static void do_statfs(fuse_req_t req, fuse_ino_t nodeid, - struct fuse_mbuf_iter *iter) -{ - (void)nodeid; - (void)iter; - - 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, - struct fuse_mbuf_iter *iter) -{ - struct fuse_setxattr_in *arg; - const char *name; - const char *value; - bool setxattr_ext = req->se->conn.want & FUSE_CAP_SETXATTR_EXT; - - if (setxattr_ext) { - arg = fuse_mbuf_iter_advance(iter, sizeof(*arg)); - } else { - arg = fuse_mbuf_iter_advance(iter, FUSE_COMPAT_SETXATTR_IN_SIZE); - } - name = fuse_mbuf_iter_advance_str(iter); - if (!arg || !name) { - fuse_reply_err(req, EINVAL); - return; - } - - value = fuse_mbuf_iter_advance(iter, arg->size); - if (!value) { - fuse_reply_err(req, EINVAL); - return; - } - - if (req->se->op.setxattr) { - uint32_t setxattr_flags = setxattr_ext ? arg->setxattr_flags : 0; - req->se->op.setxattr(req, nodeid, name, value, arg->size, arg->flags, - setxattr_flags); - } else { - fuse_reply_err(req, ENOSYS); - } -} - -static void do_getxattr(fuse_req_t req, fuse_ino_t nodeid, - struct fuse_mbuf_iter *iter) -{ - struct fuse_getxattr_in *arg; - const char *name; - - arg = fuse_mbuf_iter_advance(iter, sizeof(*arg)); - name = fuse_mbuf_iter_advance_str(iter); - if (!arg || !name) { - fuse_reply_err(req, EINVAL); - return; - } - - if (req->se->op.getxattr) { - req->se->op.getxattr(req, nodeid, name, arg->size); - } else { - fuse_reply_err(req, ENOSYS); - } -} - -static void do_listxattr(fuse_req_t req, fuse_ino_t nodeid, - struct fuse_mbuf_iter *iter) -{ - struct fuse_getxattr_in *arg; - - arg = fuse_mbuf_iter_advance(iter, sizeof(*arg)); - if (!arg) { - fuse_reply_err(req, EINVAL); - return; - } - - 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, - struct fuse_mbuf_iter *iter) -{ - const char *name = fuse_mbuf_iter_advance_str(iter); - - if (!name) { - fuse_reply_err(req, EINVAL); - return; - } - - 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, - struct fuse_mbuf_iter *iter) -{ - struct fuse_lk_in *arg; - struct fuse_file_info fi; - struct flock flock; - - arg = fuse_mbuf_iter_advance(iter, sizeof(*arg)); - if (!arg) { - fuse_reply_err(req, EINVAL); - return; - } - - 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, - struct fuse_mbuf_iter *iter, int sleep) -{ - struct fuse_lk_in *arg; - struct fuse_file_info fi; - struct flock flock; - - arg = fuse_mbuf_iter_advance(iter, sizeof(*arg)); - if (!arg) { - fuse_reply_err(req, EINVAL); - return; - } - - 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, - struct fuse_mbuf_iter *iter) -{ - do_setlk_common(req, nodeid, iter, 0); -} - -static void do_setlkw(fuse_req_t req, fuse_ino_t nodeid, - struct fuse_mbuf_iter *iter) -{ - do_setlk_common(req, nodeid, iter, 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, - struct fuse_mbuf_iter *iter) -{ - struct fuse_interrupt_in *arg; - struct fuse_session *se = req->se; - - (void)nodeid; - - arg = fuse_mbuf_iter_advance(iter, sizeof(*arg)); - if (!arg) { - fuse_reply_err(req, EINVAL); - return; - } - - fuse_log(FUSE_LOG_DEBUG, "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); - g_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, - struct fuse_mbuf_iter *iter) -{ - struct fuse_bmap_in *arg = fuse_mbuf_iter_advance(iter, sizeof(*arg)); - - if (!arg) { - fuse_reply_err(req, EINVAL); - return; - } - - 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, - struct fuse_mbuf_iter *iter) -{ - struct fuse_ioctl_in *arg; - unsigned int flags; - void *in_buf = NULL; - struct fuse_file_info fi; - - arg = fuse_mbuf_iter_advance(iter, sizeof(*arg)); - if (!arg) { - fuse_reply_err(req, EINVAL); - return; - } - - flags = arg->flags; - if (flags & FUSE_IOCTL_DIR && !(req->se->conn.want & FUSE_CAP_IOCTL_DIR)) { - fuse_reply_err(req, ENOTTY); - return; - } - - if (arg->in_size) { - in_buf = fuse_mbuf_iter_advance(iter, arg->in_size); - if (!in_buf) { - fuse_reply_err(req, EINVAL); - return; - } - } - - memset(&fi, 0, sizeof(fi)); - fi.fh = arg->fh; - - if (sizeof(void *) == 4 && !(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, - struct fuse_mbuf_iter *iter) -{ - struct fuse_poll_in *arg; - struct fuse_file_info fi; - - arg = fuse_mbuf_iter_advance(iter, sizeof(*arg)); - if (!arg) { - fuse_reply_err(req, EINVAL); - return; - } - - 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, - struct fuse_mbuf_iter *iter) -{ - struct fuse_fallocate_in *arg; - struct fuse_file_info fi; - - arg = fuse_mbuf_iter_advance(iter, sizeof(*arg)); - if (!arg) { - fuse_reply_err(req, EINVAL); - return; - } - - 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, - struct fuse_mbuf_iter *iter) -{ - struct fuse_copy_file_range_in *arg; - struct fuse_file_info fi_in, fi_out; - - arg = fuse_mbuf_iter_advance(iter, sizeof(*arg)); - if (!arg) { - fuse_reply_err(req, EINVAL); - return; - } - - 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_lseek(fuse_req_t req, fuse_ino_t nodeid, - struct fuse_mbuf_iter *iter) -{ - struct fuse_lseek_in *arg; - struct fuse_file_info fi; - - arg = fuse_mbuf_iter_advance(iter, sizeof(*arg)); - if (!arg) { - fuse_reply_err(req, EINVAL); - return; - } - memset(&fi, 0, sizeof(fi)); - fi.fh = arg->fh; - - if (req->se->op.lseek) { - req->se->op.lseek(req, nodeid, arg->offset, arg->whence, &fi); - } else { - fuse_reply_err(req, ENOSYS); - } -} - -static void do_syncfs(fuse_req_t req, fuse_ino_t nodeid, - struct fuse_mbuf_iter *iter) -{ - if (req->se->op.syncfs) { - req->se->op.syncfs(req, nodeid); - } else { - fuse_reply_err(req, ENOSYS); - } -} - -static void do_init(fuse_req_t req, fuse_ino_t nodeid, - struct fuse_mbuf_iter *iter) -{ - size_t compat_size = offsetof(struct fuse_init_in, max_readahead); - size_t compat2_size = offsetof(struct fuse_init_in, flags) + - sizeof(uint32_t); - /* Fuse structure extended with minor version 36 */ - size_t compat3_size = endof(struct fuse_init_in, unused); - struct fuse_init_in *arg; - struct fuse_init_out outarg; - struct fuse_session *se = req->se; - size_t bufsize = se->bufsize; - size_t outargsize = sizeof(outarg); - uint64_t flags = 0; - - (void)nodeid; - - /* First consume the old fields... */ - arg = fuse_mbuf_iter_advance(iter, compat_size); - if (!arg) { - fuse_reply_err(req, EINVAL); - return; - } - - /* ...and now consume the new fields. */ - if (arg->major == 7 && arg->minor >= 6) { - if (!fuse_mbuf_iter_advance(iter, compat2_size - compat_size)) { - fuse_reply_err(req, EINVAL); - return; - } - flags |= arg->flags; - } - - /* - * fuse_init_in was extended again with minor version 36. Just read - * current known size of fuse_init so that future extension and - * header rebase does not cause breakage. - */ - if (sizeof(*arg) > compat2_size && (arg->flags & FUSE_INIT_EXT)) { - if (!fuse_mbuf_iter_advance(iter, compat3_size - compat2_size)) { - fuse_reply_err(req, EINVAL); - return; - } - flags |= (uint64_t) arg->flags2 << 32; - } - - fuse_log(FUSE_LOG_DEBUG, "INIT: %u.%u\n", arg->major, arg->minor); - if (arg->major == 7 && arg->minor >= 6) { - fuse_log(FUSE_LOG_DEBUG, "flags=0x%016" PRIx64 "\n", flags); - fuse_log(FUSE_LOG_DEBUG, "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 || (arg->major == 7 && arg->minor < 31)) { - fuse_log(FUSE_LOG_ERR, "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->max_readahead < se->conn.max_readahead) { - se->conn.max_readahead = arg->max_readahead; - } - if (flags & FUSE_ASYNC_READ) { - se->conn.capable |= FUSE_CAP_ASYNC_READ; - } - if (flags & FUSE_POSIX_LOCKS) { - se->conn.capable |= FUSE_CAP_POSIX_LOCKS; - } - if (flags & FUSE_ATOMIC_O_TRUNC) { - se->conn.capable |= FUSE_CAP_ATOMIC_O_TRUNC; - } - if (flags & FUSE_EXPORT_SUPPORT) { - se->conn.capable |= FUSE_CAP_EXPORT_SUPPORT; - } - if (flags & FUSE_DONT_MASK) { - se->conn.capable |= FUSE_CAP_DONT_MASK; - } - if (flags & FUSE_FLOCK_LOCKS) { - se->conn.capable |= FUSE_CAP_FLOCK_LOCKS; - } - if (flags & FUSE_AUTO_INVAL_DATA) { - se->conn.capable |= FUSE_CAP_AUTO_INVAL_DATA; - } - if (flags & FUSE_DO_READDIRPLUS) { - se->conn.capable |= FUSE_CAP_READDIRPLUS; - } - if (flags & FUSE_READDIRPLUS_AUTO) { - se->conn.capable |= FUSE_CAP_READDIRPLUS_AUTO; - } - if (flags & FUSE_ASYNC_DIO) { - se->conn.capable |= FUSE_CAP_ASYNC_DIO; - } - if (flags & FUSE_WRITEBACK_CACHE) { - se->conn.capable |= FUSE_CAP_WRITEBACK_CACHE; - } - if (flags & FUSE_NO_OPEN_SUPPORT) { - se->conn.capable |= FUSE_CAP_NO_OPEN_SUPPORT; - } - if (flags & FUSE_PARALLEL_DIROPS) { - se->conn.capable |= FUSE_CAP_PARALLEL_DIROPS; - } - if (flags & FUSE_POSIX_ACL) { - se->conn.capable |= FUSE_CAP_POSIX_ACL; - } - if (flags & FUSE_HANDLE_KILLPRIV) { - se->conn.capable |= FUSE_CAP_HANDLE_KILLPRIV; - } - if (flags & FUSE_NO_OPENDIR_SUPPORT) { - se->conn.capable |= FUSE_CAP_NO_OPENDIR_SUPPORT; - } - if (!(flags & FUSE_MAX_PAGES)) { - size_t max_bufsize = FUSE_DEFAULT_MAX_PAGES_PER_REQ * getpagesize() + - FUSE_BUFFER_HEADER_SIZE; - if (bufsize > max_bufsize) { - bufsize = max_bufsize; - } - } - if (flags & FUSE_SUBMOUNTS) { - se->conn.capable |= FUSE_CAP_SUBMOUNTS; - } - if (flags & FUSE_HANDLE_KILLPRIV_V2) { - se->conn.capable |= FUSE_CAP_HANDLE_KILLPRIV_V2; - } - if (flags & FUSE_SETXATTR_EXT) { - se->conn.capable |= FUSE_CAP_SETXATTR_EXT; - } - if (flags & FUSE_SECURITY_CTX) { - se->conn.capable |= FUSE_CAP_SECURITY_CTX; - } -#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 - 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) { - fuse_log(FUSE_LOG_ERR, "fuse: warning: buffer size too small: %zu\n", - bufsize); - bufsize = FUSE_MIN_READ_BUFFER; - } - se->bufsize = bufsize; - - if (se->conn.max_write > bufsize - FUSE_BUFFER_HEADER_SIZE) { - se->conn.max_write = bufsize - FUSE_BUFFER_HEADER_SIZE; - } - - se->got_init = 1; - se->got_destroy = 0; - if (se->op.init) { - se->op.init(se->userdata, &se->conn); - } - - if (se->conn.want & (~se->conn.capable)) { - fuse_log(FUSE_LOG_ERR, - "fuse: error: filesystem requested capabilities " - "0x%" PRIx64 " 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; - } - - if (se->conn.max_write < bufsize - FUSE_BUFFER_HEADER_SIZE) { - se->bufsize = se->conn.max_write + FUSE_BUFFER_HEADER_SIZE; - } - if (flags & FUSE_MAX_PAGES) { - outarg.flags |= FUSE_MAX_PAGES; - outarg.max_pages = (se->conn.max_write - 1) / getpagesize() + 1; - } - - /* - * 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_PARALLEL_DIROPS) { - outarg.flags |= FUSE_PARALLEL_DIROPS; - } - 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.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; - outarg.time_gran = se->conn.time_gran; - - if (se->conn.want & FUSE_CAP_HANDLE_KILLPRIV_V2) { - outarg.flags |= FUSE_HANDLE_KILLPRIV_V2; - } - - if (se->conn.want & FUSE_CAP_SETXATTR_EXT) { - outarg.flags |= FUSE_SETXATTR_EXT; - } - - if (se->conn.want & FUSE_CAP_SECURITY_CTX) { - /* bits 32..63 get shifted down 32 bits into the flags2 field */ - outarg.flags2 |= FUSE_SECURITY_CTX >> 32; - } - - fuse_log(FUSE_LOG_DEBUG, " INIT: %u.%u\n", outarg.major, outarg.minor); - fuse_log(FUSE_LOG_DEBUG, " flags2=0x%08x flags=0x%08x\n", outarg.flags2, - outarg.flags); - fuse_log(FUSE_LOG_DEBUG, " max_readahead=0x%08x\n", outarg.max_readahead); - fuse_log(FUSE_LOG_DEBUG, " max_write=0x%08x\n", outarg.max_write); - fuse_log(FUSE_LOG_DEBUG, " max_background=%i\n", outarg.max_background); - fuse_log(FUSE_LOG_DEBUG, " congestion_threshold=%i\n", - outarg.congestion_threshold); - fuse_log(FUSE_LOG_DEBUG, " time_gran=%u\n", outarg.time_gran); - - send_reply_ok(req, &outarg, outargsize); -} - -static void do_destroy(fuse_req_t req, fuse_ino_t nodeid, - struct fuse_mbuf_iter *iter) -{ - struct fuse_session *se = req->se; - - (void)nodeid; - (void)iter; - - se->got_destroy = 1; - se->got_init = 0; - if (se->op.destroy) { - se->op.destroy(se->userdata); - } - - send_reply_ok(req, NULL, 0); -} - -int fuse_lowlevel_notify_store(struct fuse_session *se, fuse_ino_t ino, - off_t offset, struct fuse_bufvec *bufv) -{ - struct fuse_out_header out = { - .error = FUSE_NOTIFY_STORE, - }; - struct fuse_notify_store_out outarg = { - .nodeid = ino, - .offset = offset, - .size = fuse_buf_size(bufv), - }; - struct iovec iov[3]; - int res; - - if (!se) { - return -EINVAL; - } - - 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); - if (res > 0) { - res = -res; - } - - return res; -} - -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, struct fuse_mbuf_iter *); - 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] = { NULL, "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" }, - [FUSE_LSEEK] = { do_lseek, "LSEEK" }, - [FUSE_SYNCFS] = { do_syncfs, "SYNCFS" }, -}; - -#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; - } -} - -void fuse_session_process_buf(struct fuse_session *se, - const struct fuse_buf *buf) -{ - struct fuse_bufvec bufv = { .buf[0] = *buf, .count = 1 }; - fuse_session_process_buf_int(se, &bufv, NULL); -} - -/* - * Restriction: - * bufv is normally a single entry buffer, except for a write - * where (if it's in memory) then the bufv may be multiple entries, - * where the first entry contains all headers and subsequent entries - * contain data - * bufv shall not use any offsets etc to make the data anything - * other than contiguous starting from 0. - */ -void fuse_session_process_buf_int(struct fuse_session *se, - struct fuse_bufvec *bufv, - struct fuse_chan *ch) -{ - const struct fuse_buf *buf = bufv->buf; - struct fuse_mbuf_iter iter = FUSE_MBUF_ITER_INIT(buf); - struct fuse_in_header *in; - struct fuse_req *req; - int err; - - /* The first buffer must be a memory buffer */ - assert(!(buf->flags & FUSE_BUF_IS_FD)); - - in = fuse_mbuf_iter_advance(&iter, sizeof(*in)); - assert(in); /* caller guarantees the input buffer is large enough */ - - fuse_log( - FUSE_LOG_DEBUG, - "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); - return; - } - - req->unique = in->unique; - req->ctx.uid = in->uid; - req->ctx.gid = in->gid; - req->ctx.pid = in->pid; - req->ch = ch; - - /* - * INIT and DESTROY requests are serialized, all other request types - * run in parallel. This prevents races between FUSE_INIT and ordinary - * requests, FUSE_INIT and FUSE_INIT, FUSE_INIT and FUSE_DESTROY, and - * FUSE_DESTROY and FUSE_DESTROY. - */ - if (in->opcode == FUSE_INIT || in->opcode == CUSE_INIT || - in->opcode == FUSE_DESTROY) { - pthread_rwlock_wrlock(&se->init_rwlock); - } else { - pthread_rwlock_rdlock(&se->init_rwlock); - } - - 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) { - if (fuse_lowlevel_is_virtio(se)) { - /* - * TODO: This is after a hard reboot typically, we need to do - * a destroy, but we can't reply to this request yet so - * we can't use do_destroy - */ - fuse_log(FUSE_LOG_DEBUG, "%s: reinit\n", __func__); - se->got_destroy = 1; - se->got_init = 0; - if (se->op.destroy) { - se->op.destroy(se->userdata); - } - } else { - 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 (in->opcode == FUSE_WRITE && se->op.write_buf) { - do_write_buf(req, in->nodeid, &iter, bufv); - } else { - fuse_ll_ops[in->opcode].func(req, in->nodeid, &iter); - } - - pthread_rwlock_unlock(&se->init_rwlock); - return; - -reply_err: - fuse_reply_err(req, err); - pthread_rwlock_unlock(&se->init_rwlock); -} - -#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), - LL_OPTION("--socket-path=%s", vu_socket_path, 0), - LL_OPTION("--socket-group=%s", vu_socket_group, 0), - LL_OPTION("--fd=%d", vu_listen_fd, 0), - LL_OPTION("--thread-pool-size=%d", thread_pool_size, 0), - FUSE_OPT_END -}; - -void fuse_lowlevel_version(void) -{ - printf("using FUSE kernel interface version %i.%i\n", FUSE_KERNEL_VERSION, - FUSE_KERNEL_MINOR_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_root allow access by root\n" - " --socket-path=PATH path for the vhost-user socket\n" - " --socket-group=GRNAME name of group for the vhost-user socket\n" - " --fd=FDNUM fd number of vhost-user socket\n" - " --thread-pool-size=NUM thread pool size limit (default %d)\n", - THREAD_POOL_SIZE); -} - -void fuse_session_destroy(struct fuse_session *se) -{ - if (se->got_init && !se->got_destroy) { - if (se->op.destroy) { - se->op.destroy(se->userdata); - } - } - pthread_rwlock_destroy(&se->init_rwlock); - pthread_mutex_destroy(&se->lock); - free(se->cuse_data); - if (se->fd != -1) { - close(se->fd); - } - - if (fuse_lowlevel_is_virtio(se)) { - virtio_session_close(se); - } - - free(se->vu_socket_path); - se->vu_socket_path = NULL; - - g_free(se); -} - - -struct fuse_session *fuse_session_new(struct fuse_args *args, - const struct fuse_lowlevel_ops *op, - size_t op_size, void *userdata) -{ - struct fuse_session *se; - - if (sizeof(struct fuse_lowlevel_ops) < op_size) { - fuse_log( - FUSE_LOG_ERR, - "fuse: warning: library too old, some operations may not work\n"); - op_size = sizeof(struct fuse_lowlevel_ops); - } - - if (args->argc == 0) { - fuse_log(FUSE_LOG_ERR, - "fuse: empty argv passed to fuse_session_new().\n"); - return NULL; - } - - se = g_try_new0(struct fuse_session, 1); - if (se == NULL) { - fuse_log(FUSE_LOG_ERR, "fuse: failed to allocate fuse object\n"); - goto out1; - } - se->fd = -1; - se->vu_listen_fd = -1; - se->thread_pool_size = THREAD_POOL_SIZE; - 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 (args->argc == 1 && args->argv[0][0] == '-') { - fuse_log(FUSE_LOG_ERR, - "fuse: warning: argv[0] looks like an option, but " - "will be ignored\n"); - } else if (args->argc != 1) { - int i; - fuse_log(FUSE_LOG_ERR, "fuse: unknown option(s): `"); - for (i = 1; i < args->argc - 1; i++) { - fuse_log(FUSE_LOG_ERR, "%s ", args->argv[i]); - } - fuse_log(FUSE_LOG_ERR, "%s'\n", args->argv[i]); - goto out4; - } - - if (!se->vu_socket_path && se->vu_listen_fd < 0) { - fuse_log(FUSE_LOG_ERR, "fuse: missing --socket-path or --fd option\n"); - goto out4; - } - if (se->vu_socket_path && se->vu_listen_fd >= 0) { - fuse_log(FUSE_LOG_ERR, - "fuse: --socket-path and --fd cannot be given together\n"); - goto out4; - } - if (se->vu_socket_group && !se->vu_socket_path) { - fuse_log(FUSE_LOG_ERR, - "fuse: --socket-group can only be used with --socket-path\n"); - goto out4; - } - - se->bufsize = FUSE_MAX_MAX_PAGES * getpagesize() + FUSE_BUFFER_HEADER_SIZE; - - list_init_req(&se->list); - list_init_req(&se->interrupts); - fuse_mutex_init(&se->lock); - pthread_rwlock_init(&se->init_rwlock, NULL); - - memcpy(&se->op, op, op_size); - se->owner = getuid(); - se->userdata = userdata; - - return se; - -out4: - fuse_opt_free_args(args); -out2: - g_free(se); -out1: - return NULL; -} - -int fuse_session_mount(struct fuse_session *se) -{ - return virtio_session_mount(se); -} - -int fuse_session_fd(struct fuse_session *se) -{ - return se->fd; -} - -void fuse_session_unmount(struct fuse_session *se) -{ -} - -int fuse_lowlevel_is_virtio(struct fuse_session *se) -{ - return !!se->virtio_dev; -} - -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; -} |