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Re: [PATCH 04/30] virtiofsd: Add fuse_lowlevel.c
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From: |
Michael S. Tsirkin |
|
Subject: |
Re: [PATCH 04/30] virtiofsd: Add fuse_lowlevel.c |
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Date: |
Thu, 24 Oct 2019 07:11:23 -0400 |
On Mon, Oct 21, 2019 at 11:58:06AM +0100, Dr. David Alan Gilbert (git) wrote:
> From: "Dr. David Alan Gilbert" <address@hidden>
>
> fuse_lowlevel is one of the largest files from the library
> and does most of the work. Add it separately to keep the diff
> sizes small.
> Again this is from upstream a0d713619d4f21e8240ede38eefe6101ea580724
>
> Signed-off-by: Dr. David Alan Gilbert <address@hidden>
> ---
> contrib/virtiofsd/fuse_lowlevel.c | 3104 +++++++++++++++++++++++++++++
> 1 file changed, 3104 insertions(+)
> create mode 100644 contrib/virtiofsd/fuse_lowlevel.c
>
> diff --git a/contrib/virtiofsd/fuse_lowlevel.c
> b/contrib/virtiofsd/fuse_lowlevel.c
> new file mode 100644
> index 0000000000..f7fbc8f5db
> --- /dev/null
> +++ b/contrib/virtiofsd/fuse_lowlevel.c
> @@ -0,0 +1,3104 @@
> +/*
> + FUSE: Filesystem in Userspace
> + Copyright (C) 2001-2007 Miklos Szeredi <address@hidden>
> +
> + 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
I guess we need COPYING.LIB then?
> +*/
> +
> +#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));
> +}
> +
> +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_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" },
> + [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;
> +}
> --
> 2.23.0
- [PATCH 00/30] virtiofs daemon (base), Dr. David Alan Gilbert (git), 2019/10/21
- [PATCH 02/30] virtiofsd: Pull in kernel's fuse.h, Dr. David Alan Gilbert (git), 2019/10/21
- [PATCH 03/30] virtiofsd: Add auxiliary .c's, Dr. David Alan Gilbert (git), 2019/10/21
- [PATCH 04/30] virtiofsd: Add fuse_lowlevel.c, Dr. David Alan Gilbert (git), 2019/10/21
- Re: [PATCH 04/30] virtiofsd: Add fuse_lowlevel.c,
Michael S. Tsirkin <=
- [PATCH 01/30] virtiofsd: Pull in upstream headers, Dr. David Alan Gilbert (git), 2019/10/21
- [PATCH 05/30] virtiofsd: Add passthrough_ll, Dr. David Alan Gilbert (git), 2019/10/21
- [PATCH 07/30] virtiofsd: remove mountpoint dummy argument, Dr. David Alan Gilbert (git), 2019/10/21
- [PATCH 06/30] virtiofsd: Trim down imported files, Dr. David Alan Gilbert (git), 2019/10/21
- [PATCH 09/30] virtiofsd: Fix fuse_daemonize ignored return values, Dr. David Alan Gilbert (git), 2019/10/21
- [PATCH 08/30] virtiofsd: remove unused notify reply support, Dr. David Alan Gilbert (git), 2019/10/21
- [PATCH 10/30] virtiofsd: Fix common header and define for QEMU builds, Dr. David Alan Gilbert (git), 2019/10/21
- [PATCH 11/30] virtiofsd: fuse: Make iov_length usable outside fuse_lowlevel.c, Dr. David Alan Gilbert (git), 2019/10/21