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