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qemu/0012-virtiofsd-Add-auxiliary-.c-s.patch

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qemu-4.2.0-4.fc32 virtio-fs support from upstream
2020-01-28 14:48:34 +00:00
From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Date: Mon, 27 Jan 2020 19:00:41 +0000
Subject: [PATCH] virtiofsd: Add auxiliary .c's
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Add most of the non-main .c files we need from upstream fuse-3.8.0
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
(cherry picked from commit ffcf8d9f8649c6e56b1193bbbc9c9f7388920043)
---
tools/virtiofsd/buffer.c | 321 ++++++++++++++++++++++++
tools/virtiofsd/fuse_log.c | 40 +++
tools/virtiofsd/fuse_opt.c | 423 +++++++++++++++++++++++++++++++
tools/virtiofsd/fuse_signals.c | 91 +++++++
tools/virtiofsd/helper.c | 440 +++++++++++++++++++++++++++++++++
5 files changed, 1315 insertions(+)
create mode 100644 tools/virtiofsd/buffer.c
create mode 100644 tools/virtiofsd/fuse_log.c
create mode 100644 tools/virtiofsd/fuse_opt.c
create mode 100644 tools/virtiofsd/fuse_signals.c
create mode 100644 tools/virtiofsd/helper.c
diff --git a/tools/virtiofsd/buffer.c b/tools/virtiofsd/buffer.c
new file mode 100644
index 0000000000..5ab9b87455
--- /dev/null
+++ b/tools/virtiofsd/buffer.c
@@ -0,0 +1,321 @@
+/*
+ FUSE: Filesystem in Userspace
+ Copyright (C) 2010 Miklos Szeredi <miklos@szeredi.hu>
+
+ Functions for dealing with `struct fuse_buf` and `struct
+ fuse_bufvec`.
+
+ 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_lowlevel.h"
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <assert.h>
+
+size_t fuse_buf_size(const struct fuse_bufvec *bufv)
+{
+ size_t i;
+ size_t size = 0;
+
+ for (i = 0; i < bufv->count; i++) {
+ if (bufv->buf[i].size == SIZE_MAX)
+ size = SIZE_MAX;
+ else
+ size += bufv->buf[i].size;
+ }
+
+ return size;
+}
+
+static size_t min_size(size_t s1, size_t s2)
+{
+ return s1 < s2 ? s1 : s2;
+}
+
+static ssize_t fuse_buf_write(const struct fuse_buf *dst, size_t dst_off,
+ const struct fuse_buf *src, size_t src_off,
+ size_t len)
+{
+ ssize_t res = 0;
+ size_t copied = 0;
+
+ while (len) {
+ if (dst->flags & FUSE_BUF_FD_SEEK) {
+ res = pwrite(dst->fd, (char *)src->mem + src_off, len,
+ dst->pos + dst_off);
+ } else {
+ res = write(dst->fd, (char *)src->mem + src_off, len);
+ }
+ if (res == -1) {
+ if (!copied)
+ return -errno;
+ break;
+ }
+ if (res == 0)
+ break;
+
+ copied += res;
+ if (!(dst->flags & FUSE_BUF_FD_RETRY))
+ break;
+
+ src_off += res;
+ dst_off += res;
+ len -= res;
+ }
+
+ return copied;
+}
+
+static ssize_t fuse_buf_read(const struct fuse_buf *dst, size_t dst_off,
+ const struct fuse_buf *src, size_t src_off,
+ size_t len)
+{
+ ssize_t res = 0;
+ size_t copied = 0;
+
+ while (len) {
+ if (src->flags & FUSE_BUF_FD_SEEK) {
+ res = pread(src->fd, (char *)dst->mem + dst_off, len,
+ src->pos + src_off);
+ } else {
+ res = read(src->fd, (char *)dst->mem + dst_off, len);
+ }
+ if (res == -1) {
+ if (!copied)
+ return -errno;
+ break;
+ }
+ if (res == 0)
+ break;
+
+ copied += res;
+ if (!(src->flags & FUSE_BUF_FD_RETRY))
+ break;
+
+ dst_off += res;
+ src_off += res;
+ len -= res;
+ }
+
+ return copied;
+}
+
+static ssize_t fuse_buf_fd_to_fd(const struct fuse_buf *dst, size_t dst_off,
+ const struct fuse_buf *src, size_t src_off,
+ size_t len)
+{
+ char buf[4096];
+ struct fuse_buf tmp = {
+ .size = sizeof(buf),
+ .flags = 0,
+ };
+ ssize_t res;
+ size_t copied = 0;
+
+ tmp.mem = buf;
+
+ while (len) {
+ size_t this_len = min_size(tmp.size, len);
+ size_t read_len;
+
+ res = fuse_buf_read(&tmp, 0, src, src_off, this_len);
+ if (res < 0) {
+ if (!copied)
+ return res;
+ break;
+ }
+ if (res == 0)
+ break;
+
+ read_len = res;
+ res = fuse_buf_write(dst, dst_off, &tmp, 0, read_len);
+ if (res < 0) {
+ if (!copied)
+ return res;
+ break;
+ }
+ if (res == 0)
+ break;
+
+ copied += res;
+
+ if (res < this_len)
+ break;
+
+ dst_off += res;
+ src_off += res;
+ len -= res;
+ }
+
+ return copied;
+}
+
+#ifdef HAVE_SPLICE
+static ssize_t fuse_buf_splice(const struct fuse_buf *dst, size_t dst_off,
+ const struct fuse_buf *src, size_t src_off,
+ size_t len, enum fuse_buf_copy_flags flags)
+{
+ int splice_flags = 0;
+ off_t *srcpos = NULL;
+ off_t *dstpos = NULL;
+ off_t srcpos_val;
+ off_t dstpos_val;
+ ssize_t res;
+ size_t copied = 0;
+
+ if (flags & FUSE_BUF_SPLICE_MOVE)
+ splice_flags |= SPLICE_F_MOVE;
+ if (flags & FUSE_BUF_SPLICE_NONBLOCK)
+ splice_flags |= SPLICE_F_NONBLOCK;
+
+ if (src->flags & FUSE_BUF_FD_SEEK) {
+ srcpos_val = src->pos + src_off;
+ srcpos = &srcpos_val;
+ }
+ if (dst->flags & FUSE_BUF_FD_SEEK) {
+ dstpos_val = dst->pos + dst_off;
+ dstpos = &dstpos_val;
+ }
+
+ while (len) {
+ res = splice(src->fd, srcpos, dst->fd, dstpos, len,
+ splice_flags);
+ if (res == -1) {
+ if (copied)
+ break;
+
+ if (errno != EINVAL || (flags & FUSE_BUF_FORCE_SPLICE))
+ return -errno;
+
+ /* Maybe splice is not supported for this combination */
+ return fuse_buf_fd_to_fd(dst, dst_off, src, src_off,
+ len);
+ }
+ if (res == 0)
+ break;
+
+ copied += res;
+ if (!(src->flags & FUSE_BUF_FD_RETRY) &&
+ !(dst->flags & FUSE_BUF_FD_RETRY)) {
+ break;
+ }
+
+ len -= res;
+ }
+
+ return copied;
+}
+#else
+static ssize_t fuse_buf_splice(const struct fuse_buf *dst, size_t dst_off,
+ const struct fuse_buf *src, size_t src_off,
+ size_t len, enum fuse_buf_copy_flags flags)
+{
+ (void) flags;
+
+ return fuse_buf_fd_to_fd(dst, dst_off, src, src_off, len);
+}
+#endif
+
+
+static ssize_t fuse_buf_copy_one(const struct fuse_buf *dst, size_t dst_off,
+ const struct fuse_buf *src, size_t src_off,
+ size_t len, enum fuse_buf_copy_flags flags)
+{
+ int src_is_fd = src->flags & FUSE_BUF_IS_FD;
+ int dst_is_fd = dst->flags & FUSE_BUF_IS_FD;
+
+ if (!src_is_fd && !dst_is_fd) {
+ char *dstmem = (char *)dst->mem + dst_off;
+ char *srcmem = (char *)src->mem + src_off;
+
+ if (dstmem != srcmem) {
+ if (dstmem + len <= srcmem || srcmem + len <= dstmem)
+ memcpy(dstmem, srcmem, len);
+ else
+ memmove(dstmem, srcmem, len);
+ }
+
+ return len;
+ } else if (!src_is_fd) {
+ return fuse_buf_write(dst, dst_off, src, src_off, len);
+ } else if (!dst_is_fd) {
+ return fuse_buf_read(dst, dst_off, src, src_off, len);
+ } else if (flags & FUSE_BUF_NO_SPLICE) {
+ return fuse_buf_fd_to_fd(dst, dst_off, src, src_off, len);
+ } else {
+ return fuse_buf_splice(dst, dst_off, src, src_off, len, flags);
+ }
+}
+
+static const struct fuse_buf *fuse_bufvec_current(struct fuse_bufvec *bufv)
+{
+ if (bufv->idx < bufv->count)
+ return &bufv->buf[bufv->idx];
+ else
+ return NULL;
+}
+
+static int fuse_bufvec_advance(struct fuse_bufvec *bufv, size_t len)
+{
+ const struct fuse_buf *buf = fuse_bufvec_current(bufv);
+
+ bufv->off += len;
+ assert(bufv->off <= buf->size);
+ if (bufv->off == buf->size) {
+ assert(bufv->idx < bufv->count);
+ bufv->idx++;
+ if (bufv->idx == bufv->count)
+ return 0;
+ bufv->off = 0;
+ }
+ return 1;
+}
+
+ssize_t fuse_buf_copy(struct fuse_bufvec *dstv, struct fuse_bufvec *srcv,
+ enum fuse_buf_copy_flags flags)
+{
+ size_t copied = 0;
+
+ if (dstv == srcv)
+ return fuse_buf_size(dstv);
+
+ for (;;) {
+ const struct fuse_buf *src = fuse_bufvec_current(srcv);
+ const struct fuse_buf *dst = fuse_bufvec_current(dstv);
+ size_t src_len;
+ size_t dst_len;
+ size_t len;
+ ssize_t res;
+
+ if (src == NULL || dst == NULL)
+ break;
+
+ src_len = src->size - srcv->off;
+ dst_len = dst->size - dstv->off;
+ len = min_size(src_len, dst_len);
+
+ res = fuse_buf_copy_one(dst, dstv->off, src, srcv->off, len, flags);
+ if (res < 0) {
+ if (!copied)
+ return res;
+ break;
+ }
+ copied += res;
+
+ if (!fuse_bufvec_advance(srcv, res) ||
+ !fuse_bufvec_advance(dstv, res))
+ break;
+
+ if (res < len)
+ break;
+ }
+
+ return copied;
+}
diff --git a/tools/virtiofsd/fuse_log.c b/tools/virtiofsd/fuse_log.c
new file mode 100644
index 0000000000..0d268ab014
--- /dev/null
+++ b/tools/virtiofsd/fuse_log.c
@@ -0,0 +1,40 @@
+/*
+ FUSE: Filesystem in Userspace
+ Copyright (C) 2019 Red Hat, Inc.
+
+ Logging API.
+
+ This program can be distributed under the terms of the GNU LGPLv2.
+ See the file COPYING.LIB
+*/
+
+#include "fuse_log.h"
+
+#include <stdarg.h>
+#include <stdio.h>
+
+static void default_log_func(
+ __attribute__(( unused )) enum fuse_log_level level,
+ const char *fmt, va_list ap)
+{
+ vfprintf(stderr, fmt, ap);
+}
+
+static fuse_log_func_t log_func = default_log_func;
+
+void fuse_set_log_func(fuse_log_func_t func)
+{
+ if (!func)
+ func = default_log_func;
+
+ log_func = func;
+}
+
+void fuse_log(enum fuse_log_level level, const char *fmt, ...)
+{
+ va_list ap;
+
+ va_start(ap, fmt);
+ log_func(level, fmt, ap);
+ va_end(ap);
+}
diff --git a/tools/virtiofsd/fuse_opt.c b/tools/virtiofsd/fuse_opt.c
new file mode 100644
index 0000000000..93066b926e
--- /dev/null
+++ b/tools/virtiofsd/fuse_opt.c
@@ -0,0 +1,423 @@
+/*
+ FUSE: Filesystem in Userspace
+ Copyright (C) 2001-2007 Miklos Szeredi <miklos@szeredi.hu>
+
+ Implementation of option parsing routines (dealing with `struct
+ fuse_args`).
+
+ This program can be distributed under the terms of the GNU LGPLv2.
+ See the file COPYING.LIB
+*/
+
+#include "config.h"
+#include "fuse_i.h"
+#include "fuse_opt.h"
+#include "fuse_misc.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+struct fuse_opt_context {
+ void *data;
+ const struct fuse_opt *opt;
+ fuse_opt_proc_t proc;
+ int argctr;
+ int argc;
+ char **argv;
+ struct fuse_args outargs;
+ char *opts;
+ int nonopt;
+};
+
+void fuse_opt_free_args(struct fuse_args *args)
+{
+ if (args) {
+ if (args->argv && args->allocated) {
+ int i;
+ for (i = 0; i < args->argc; i++)
+ free(args->argv[i]);
+ free(args->argv);
+ }
+ args->argc = 0;
+ args->argv = NULL;
+ args->allocated = 0;
+ }
+}
+
+static int alloc_failed(void)
+{
+ fuse_log(FUSE_LOG_ERR, "fuse: memory allocation failed\n");
+ return -1;
+}
+
+int fuse_opt_add_arg(struct fuse_args *args, const char *arg)
+{
+ char **newargv;
+ char *newarg;
+
+ assert(!args->argv || args->allocated);
+
+ newarg = strdup(arg);
+ if (!newarg)
+ return alloc_failed();
+
+ newargv = realloc(args->argv, (args->argc + 2) * sizeof(char *));
+ if (!newargv) {
+ free(newarg);
+ return alloc_failed();
+ }
+
+ args->argv = newargv;
+ args->allocated = 1;
+ args->argv[args->argc++] = newarg;
+ args->argv[args->argc] = NULL;
+ return 0;
+}
+
+static int fuse_opt_insert_arg_common(struct fuse_args *args, int pos,
+ const char *arg)
+{
+ assert(pos <= args->argc);
+ if (fuse_opt_add_arg(args, arg) == -1)
+ return -1;
+
+ if (pos != args->argc - 1) {
+ char *newarg = args->argv[args->argc - 1];
+ memmove(&args->argv[pos + 1], &args->argv[pos],
+ sizeof(char *) * (args->argc - pos - 1));
+ args->argv[pos] = newarg;
+ }
+ return 0;
+}
+
+int fuse_opt_insert_arg(struct fuse_args *args, int pos, const char *arg)
+{
+ return fuse_opt_insert_arg_common(args, pos, arg);
+}
+
+static int next_arg(struct fuse_opt_context *ctx, const char *opt)
+{
+ if (ctx->argctr + 1 >= ctx->argc) {
+ fuse_log(FUSE_LOG_ERR, "fuse: missing argument after `%s'\n", opt);
+ return -1;
+ }
+ ctx->argctr++;
+ return 0;
+}
+
+static int add_arg(struct fuse_opt_context *ctx, const char *arg)
+{
+ return fuse_opt_add_arg(&ctx->outargs, arg);
+}
+
+static int add_opt_common(char **opts, const char *opt, int esc)
+{
+ unsigned oldlen = *opts ? strlen(*opts) : 0;
+ char *d = realloc(*opts, oldlen + 1 + strlen(opt) * 2 + 1);
+
+ if (!d)
+ return alloc_failed();
+
+ *opts = d;
+ if (oldlen) {
+ d += oldlen;
+ *d++ = ',';
+ }
+
+ for (; *opt; opt++) {
+ if (esc && (*opt == ',' || *opt == '\\'))
+ *d++ = '\\';
+ *d++ = *opt;
+ }
+ *d = '\0';
+
+ return 0;
+}
+
+int fuse_opt_add_opt(char **opts, const char *opt)
+{
+ return add_opt_common(opts, opt, 0);
+}
+
+int fuse_opt_add_opt_escaped(char **opts, const char *opt)
+{
+ return add_opt_common(opts, opt, 1);
+}
+
+static int add_opt(struct fuse_opt_context *ctx, const char *opt)
+{
+ return add_opt_common(&ctx->opts, opt, 1);
+}
+
+static int call_proc(struct fuse_opt_context *ctx, const char *arg, int key,
+ int iso)
+{
+ if (key == FUSE_OPT_KEY_DISCARD)
+ return 0;
+
+ if (key != FUSE_OPT_KEY_KEEP && ctx->proc) {
+ int res = ctx->proc(ctx->data, arg, key, &ctx->outargs);
+ if (res == -1 || !res)
+ return res;
+ }
+ if (iso)
+ return add_opt(ctx, arg);
+ else
+ return add_arg(ctx, arg);
+}
+
+static int match_template(const char *t, const char *arg, unsigned *sepp)
+{
+ int arglen = strlen(arg);
+ const char *sep = strchr(t, '=');
+ sep = sep ? sep : strchr(t, ' ');
+ if (sep && (!sep[1] || sep[1] == '%')) {
+ int tlen = sep - t;
+ if (sep[0] == '=')
+ tlen ++;
+ if (arglen >= tlen && strncmp(arg, t, tlen) == 0) {
+ *sepp = sep - t;
+ return 1;
+ }
+ }
+ if (strcmp(t, arg) == 0) {
+ *sepp = 0;
+ return 1;
+ }
+ return 0;
+}
+
+static const struct fuse_opt *find_opt(const struct fuse_opt *opt,
+ const char *arg, unsigned *sepp)
+{
+ for (; opt && opt->templ; opt++)
+ if (match_template(opt->templ, arg, sepp))
+ return opt;
+ return NULL;
+}
+
+int fuse_opt_match(const struct fuse_opt *opts, const char *opt)
+{
+ unsigned dummy;
+ return find_opt(opts, opt, &dummy) ? 1 : 0;
+}
+
+static int process_opt_param(void *var, const char *format, const char *param,
+ const char *arg)
+{
+ assert(format[0] == '%');
+ if (format[1] == 's') {
+ char **s = var;
+ char *copy = strdup(param);
+ if (!copy)
+ return alloc_failed();
+
+ free(*s);
+ *s = copy;
+ } else {
+ if (sscanf(param, format, var) != 1) {
+ fuse_log(FUSE_LOG_ERR, "fuse: invalid parameter in option `%s'\n", arg);
+ return -1;
+ }
+ }
+ return 0;
+}
+
+static int process_opt(struct fuse_opt_context *ctx,
+ const struct fuse_opt *opt, unsigned sep,
+ const char *arg, int iso)
+{
+ if (opt->offset == -1U) {
+ if (call_proc(ctx, arg, opt->value, iso) == -1)
+ return -1;
+ } else {
+ void *var = (char *)ctx->data + opt->offset;
+ if (sep && opt->templ[sep + 1]) {
+ const char *param = arg + sep;
+ if (opt->templ[sep] == '=')
+ param ++;
+ if (process_opt_param(var, opt->templ + sep + 1,
+ param, arg) == -1)
+ return -1;
+ } else
+ *(int *)var = opt->value;
+ }
+ return 0;
+}
+
+static int process_opt_sep_arg(struct fuse_opt_context *ctx,
+ const struct fuse_opt *opt, unsigned sep,
+ const char *arg, int iso)
+{
+ int res;
+ char *newarg;
+ char *param;
+
+ if (next_arg(ctx, arg) == -1)
+ return -1;
+
+ param = ctx->argv[ctx->argctr];
+ newarg = malloc(sep + strlen(param) + 1);
+ if (!newarg)
+ return alloc_failed();
+
+ memcpy(newarg, arg, sep);
+ strcpy(newarg + sep, param);
+ res = process_opt(ctx, opt, sep, newarg, iso);
+ free(newarg);
+
+ return res;
+}
+
+static int process_gopt(struct fuse_opt_context *ctx, const char *arg, int iso)
+{
+ unsigned sep;
+ const struct fuse_opt *opt = find_opt(ctx->opt, arg, &sep);
+ if (opt) {
+ for (; opt; opt = find_opt(opt + 1, arg, &sep)) {
+ int res;
+ if (sep && opt->templ[sep] == ' ' && !arg[sep])
+ res = process_opt_sep_arg(ctx, opt, sep, arg,
+ iso);
+ else
+ res = process_opt(ctx, opt, sep, arg, iso);
+ if (res == -1)
+ return -1;
+ }
+ return 0;
+ } else
+ return call_proc(ctx, arg, FUSE_OPT_KEY_OPT, iso);
+}
+
+static int process_real_option_group(struct fuse_opt_context *ctx, char *opts)
+{
+ char *s = opts;
+ char *d = s;
+ int end = 0;
+
+ while (!end) {
+ if (*s == '\0')
+ end = 1;
+ if (*s == ',' || end) {
+ int res;
+
+ *d = '\0';
+ res = process_gopt(ctx, opts, 1);
+ if (res == -1)
+ return -1;
+ d = opts;
+ } else {
+ if (s[0] == '\\' && s[1] != '\0') {
+ s++;
+ if (s[0] >= '0' && s[0] <= '3' &&
+ s[1] >= '0' && s[1] <= '7' &&
+ s[2] >= '0' && s[2] <= '7') {
+ *d++ = (s[0] - '0') * 0100 +
+ (s[1] - '0') * 0010 +
+ (s[2] - '0');
+ s += 2;
+ } else {
+ *d++ = *s;
+ }
+ } else {
+ *d++ = *s;
+ }
+ }
+ s++;
+ }
+
+ return 0;
+}
+
+static int process_option_group(struct fuse_opt_context *ctx, const char *opts)
+{
+ int res;
+ char *copy = strdup(opts);
+
+ if (!copy) {
+ fuse_log(FUSE_LOG_ERR, "fuse: memory allocation failed\n");
+ return -1;
+ }
+ res = process_real_option_group(ctx, copy);
+ free(copy);
+ return res;
+}
+
+static int process_one(struct fuse_opt_context *ctx, const char *arg)
+{
+ if (ctx->nonopt || arg[0] != '-')
+ return call_proc(ctx, arg, FUSE_OPT_KEY_NONOPT, 0);
+ else if (arg[1] == 'o') {
+ if (arg[2])
+ return process_option_group(ctx, arg + 2);
+ else {
+ if (next_arg(ctx, arg) == -1)
+ return -1;
+
+ return process_option_group(ctx,
+ ctx->argv[ctx->argctr]);
+ }
+ } else if (arg[1] == '-' && !arg[2]) {
+ if (add_arg(ctx, arg) == -1)
+ return -1;
+ ctx->nonopt = ctx->outargs.argc;
+ return 0;
+ } else
+ return process_gopt(ctx, arg, 0);
+}
+
+static int opt_parse(struct fuse_opt_context *ctx)
+{
+ if (ctx->argc) {
+ if (add_arg(ctx, ctx->argv[0]) == -1)
+ return -1;
+ }
+
+ for (ctx->argctr = 1; ctx->argctr < ctx->argc; ctx->argctr++)
+ if (process_one(ctx, ctx->argv[ctx->argctr]) == -1)
+ return -1;
+
+ if (ctx->opts) {
+ if (fuse_opt_insert_arg(&ctx->outargs, 1, "-o") == -1 ||
+ fuse_opt_insert_arg(&ctx->outargs, 2, ctx->opts) == -1)
+ return -1;
+ }
+
+ /* If option separator ("--") is the last argument, remove it */
+ if (ctx->nonopt && ctx->nonopt == ctx->outargs.argc &&
+ strcmp(ctx->outargs.argv[ctx->outargs.argc - 1], "--") == 0) {
+ free(ctx->outargs.argv[ctx->outargs.argc - 1]);
+ ctx->outargs.argv[--ctx->outargs.argc] = NULL;
+ }
+
+ return 0;
+}
+
+int fuse_opt_parse(struct fuse_args *args, void *data,
+ const struct fuse_opt opts[], fuse_opt_proc_t proc)
+{
+ int res;
+ struct fuse_opt_context ctx = {
+ .data = data,
+ .opt = opts,
+ .proc = proc,
+ };
+
+ if (!args || !args->argv || !args->argc)
+ return 0;
+
+ ctx.argc = args->argc;
+ ctx.argv = args->argv;
+
+ res = opt_parse(&ctx);
+ if (res != -1) {
+ struct fuse_args tmp = *args;
+ *args = ctx.outargs;
+ ctx.outargs = tmp;
+ }
+ free(ctx.opts);
+ fuse_opt_free_args(&ctx.outargs);
+ return res;
+}
diff --git a/tools/virtiofsd/fuse_signals.c b/tools/virtiofsd/fuse_signals.c
new file mode 100644
index 0000000000..4271947bd4
--- /dev/null
+++ b/tools/virtiofsd/fuse_signals.c
@@ -0,0 +1,91 @@
+/*
+ FUSE: Filesystem in Userspace
+ Copyright (C) 2001-2007 Miklos Szeredi <miklos@szeredi.hu>
+
+ Utility functions for setting signal handlers.
+
+ This program can be distributed under the terms of the GNU LGPLv2.
+ See the file COPYING.LIB
+*/
+
+#include "config.h"
+#include "fuse_lowlevel.h"
+#include "fuse_i.h"
+
+#include <stdio.h>
+#include <string.h>
+#include <signal.h>
+#include <stdlib.h>
+
+static struct fuse_session *fuse_instance;
+
+static void exit_handler(int sig)
+{
+ if (fuse_instance) {
+ fuse_session_exit(fuse_instance);
+ if(sig <= 0) {
+ fuse_log(FUSE_LOG_ERR, "assertion error: signal value <= 0\n");
+ abort();
+ }
+ fuse_instance->error = sig;
+ }
+}
+
+static void do_nothing(int sig)
+{
+ (void) sig;
+}
+
+static int set_one_signal_handler(int sig, void (*handler)(int), int remove)
+{
+ struct sigaction sa;
+ struct sigaction old_sa;
+
+ memset(&sa, 0, sizeof(struct sigaction));
+ sa.sa_handler = remove ? SIG_DFL : handler;
+ sigemptyset(&(sa.sa_mask));
+ sa.sa_flags = 0;
+
+ if (sigaction(sig, NULL, &old_sa) == -1) {
+ perror("fuse: cannot get old signal handler");
+ return -1;
+ }
+
+ if (old_sa.sa_handler == (remove ? handler : SIG_DFL) &&
+ sigaction(sig, &sa, NULL) == -1) {
+ perror("fuse: cannot set signal handler");
+ return -1;
+ }
+ return 0;
+}
+
+int fuse_set_signal_handlers(struct fuse_session *se)
+{
+ /* If we used SIG_IGN instead of the do_nothing function,
+ then we would be unable to tell if we set SIG_IGN (and
+ thus should reset to SIG_DFL in fuse_remove_signal_handlers)
+ or if it was already set to SIG_IGN (and should be left
+ untouched. */
+ if (set_one_signal_handler(SIGHUP, exit_handler, 0) == -1 ||
+ set_one_signal_handler(SIGINT, exit_handler, 0) == -1 ||
+ set_one_signal_handler(SIGTERM, exit_handler, 0) == -1 ||
+ set_one_signal_handler(SIGPIPE, do_nothing, 0) == -1)
+ return -1;
+
+ fuse_instance = se;
+ return 0;
+}
+
+void fuse_remove_signal_handlers(struct fuse_session *se)
+{
+ if (fuse_instance != se)
+ fuse_log(FUSE_LOG_ERR,
+ "fuse: fuse_remove_signal_handlers: unknown session\n");
+ else
+ fuse_instance = NULL;
+
+ set_one_signal_handler(SIGHUP, exit_handler, 1);
+ set_one_signal_handler(SIGINT, exit_handler, 1);
+ set_one_signal_handler(SIGTERM, exit_handler, 1);
+ set_one_signal_handler(SIGPIPE, do_nothing, 1);
+}
diff --git a/tools/virtiofsd/helper.c b/tools/virtiofsd/helper.c
new file mode 100644
index 0000000000..64ff7ad6d5
--- /dev/null
+++ b/tools/virtiofsd/helper.c
@@ -0,0 +1,440 @@
+/*
+ FUSE: Filesystem in Userspace
+ Copyright (C) 2001-2007 Miklos Szeredi <miklos@szeredi.hu>
+
+ Helper functions to create (simple) standalone programs. With the
+ aid of these functions it should be possible to create full FUSE
+ file system by implementing nothing but the request handlers.
+
+ This program can be distributed under the terms of the GNU LGPLv2.
+ See the file COPYING.LIB.
+*/
+
+#include "config.h"
+#include "fuse_i.h"
+#include "fuse_misc.h"
+#include "fuse_opt.h"
+#include "fuse_lowlevel.h"
+#include "mount_util.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <unistd.h>
+#include <string.h>
+#include <limits.h>
+#include <errno.h>
+#include <sys/param.h>
+
+#define FUSE_HELPER_OPT(t, p) \
+ { t, offsetof(struct fuse_cmdline_opts, p), 1 }
+
+static const struct fuse_opt fuse_helper_opts[] = {
+ FUSE_HELPER_OPT("-h", show_help),
+ FUSE_HELPER_OPT("--help", show_help),
+ FUSE_HELPER_OPT("-V", show_version),
+ FUSE_HELPER_OPT("--version", show_version),
+ FUSE_HELPER_OPT("-d", debug),
+ FUSE_HELPER_OPT("debug", debug),
+ FUSE_HELPER_OPT("-d", foreground),
+ FUSE_HELPER_OPT("debug", foreground),
+ FUSE_OPT_KEY("-d", FUSE_OPT_KEY_KEEP),
+ FUSE_OPT_KEY("debug", FUSE_OPT_KEY_KEEP),
+ FUSE_HELPER_OPT("-f", foreground),
+ FUSE_HELPER_OPT("-s", singlethread),
+ FUSE_HELPER_OPT("fsname=", nodefault_subtype),
+ FUSE_OPT_KEY("fsname=", FUSE_OPT_KEY_KEEP),
+#ifndef __FreeBSD__
+ FUSE_HELPER_OPT("subtype=", nodefault_subtype),
+ FUSE_OPT_KEY("subtype=", FUSE_OPT_KEY_KEEP),
+#endif
+ FUSE_HELPER_OPT("clone_fd", clone_fd),
+ FUSE_HELPER_OPT("max_idle_threads=%u", max_idle_threads),
+ FUSE_OPT_END
+};
+
+struct fuse_conn_info_opts {
+ int atomic_o_trunc;
+ int no_remote_posix_lock;
+ int no_remote_flock;
+ int splice_write;
+ int splice_move;
+ int splice_read;
+ int no_splice_write;
+ int no_splice_move;
+ int no_splice_read;
+ int auto_inval_data;
+ int no_auto_inval_data;
+ int no_readdirplus;
+ int no_readdirplus_auto;
+ int async_dio;
+ int no_async_dio;
+ int writeback_cache;
+ int no_writeback_cache;
+ int async_read;
+ int sync_read;
+ unsigned max_write;
+ unsigned max_readahead;
+ unsigned max_background;
+ unsigned congestion_threshold;
+ unsigned time_gran;
+ int set_max_write;
+ int set_max_readahead;
+ int set_max_background;
+ int set_congestion_threshold;
+ int set_time_gran;
+};
+
+#define CONN_OPTION(t, p, v) \
+ { t, offsetof(struct fuse_conn_info_opts, p), v }
+static const struct fuse_opt conn_info_opt_spec[] = {
+ CONN_OPTION("max_write=%u", max_write, 0),
+ CONN_OPTION("max_write=", set_max_write, 1),
+ CONN_OPTION("max_readahead=%u", max_readahead, 0),
+ CONN_OPTION("max_readahead=", set_max_readahead, 1),
+ CONN_OPTION("max_background=%u", max_background, 0),
+ CONN_OPTION("max_background=", set_max_background, 1),
+ CONN_OPTION("congestion_threshold=%u", congestion_threshold, 0),
+ CONN_OPTION("congestion_threshold=", set_congestion_threshold, 1),
+ CONN_OPTION("sync_read", sync_read, 1),
+ CONN_OPTION("async_read", async_read, 1),
+ CONN_OPTION("atomic_o_trunc", atomic_o_trunc, 1),
+ CONN_OPTION("no_remote_lock", no_remote_posix_lock, 1),
+ CONN_OPTION("no_remote_lock", no_remote_flock, 1),
+ CONN_OPTION("no_remote_flock", no_remote_flock, 1),
+ CONN_OPTION("no_remote_posix_lock", no_remote_posix_lock, 1),
+ CONN_OPTION("splice_write", splice_write, 1),
+ CONN_OPTION("no_splice_write", no_splice_write, 1),
+ CONN_OPTION("splice_move", splice_move, 1),
+ CONN_OPTION("no_splice_move", no_splice_move, 1),
+ CONN_OPTION("splice_read", splice_read, 1),
+ CONN_OPTION("no_splice_read", no_splice_read, 1),
+ CONN_OPTION("auto_inval_data", auto_inval_data, 1),
+ CONN_OPTION("no_auto_inval_data", no_auto_inval_data, 1),
+ CONN_OPTION("readdirplus=no", no_readdirplus, 1),
+ CONN_OPTION("readdirplus=yes", no_readdirplus, 0),
+ CONN_OPTION("readdirplus=yes", no_readdirplus_auto, 1),
+ CONN_OPTION("readdirplus=auto", no_readdirplus, 0),
+ CONN_OPTION("readdirplus=auto", no_readdirplus_auto, 0),
+ CONN_OPTION("async_dio", async_dio, 1),
+ CONN_OPTION("no_async_dio", no_async_dio, 1),
+ CONN_OPTION("writeback_cache", writeback_cache, 1),
+ CONN_OPTION("no_writeback_cache", no_writeback_cache, 1),
+ CONN_OPTION("time_gran=%u", time_gran, 0),
+ CONN_OPTION("time_gran=", set_time_gran, 1),
+ FUSE_OPT_END
+};
+
+
+void fuse_cmdline_help(void)
+{
+ printf(" -h --help print help\n"
+ " -V --version print version\n"
+ " -d -o debug enable debug output (implies -f)\n"
+ " -f foreground operation\n"
+ " -s disable multi-threaded operation\n"
+ " -o clone_fd use separate fuse device fd for each thread\n"
+ " (may improve performance)\n"
+ " -o max_idle_threads the maximum number of idle worker threads\n"
+ " allowed (default: 10)\n");
+}
+
+static int fuse_helper_opt_proc(void *data, const char *arg, int key,
+ struct fuse_args *outargs)
+{
+ (void) outargs;
+ struct fuse_cmdline_opts *opts = data;
+
+ switch (key) {
+ case FUSE_OPT_KEY_NONOPT:
+ if (!opts->mountpoint) {
+ if (fuse_mnt_parse_fuse_fd(arg) != -1) {
+ return fuse_opt_add_opt(&opts->mountpoint, arg);
+ }
+
+ char mountpoint[PATH_MAX] = "";
+ if (realpath(arg, mountpoint) == NULL) {
+ fuse_log(FUSE_LOG_ERR,
+ "fuse: bad mount point `%s': %s\n",
+ arg, strerror(errno));
+ return -1;
+ }
+ return fuse_opt_add_opt(&opts->mountpoint, mountpoint);
+ } else {
+ fuse_log(FUSE_LOG_ERR, "fuse: invalid argument `%s'\n", arg);
+ return -1;
+ }
+
+ default:
+ /* Pass through unknown options */
+ return 1;
+ }
+}
+
+/* Under FreeBSD, there is no subtype option so this
+ function actually sets the fsname */
+static int add_default_subtype(const char *progname, struct fuse_args *args)
+{
+ int res;
+ char *subtype_opt;
+
+ const char *basename = strrchr(progname, '/');
+ if (basename == NULL)
+ basename = progname;
+ else if (basename[1] != '\0')
+ basename++;
+
+ subtype_opt = (char *) malloc(strlen(basename) + 64);
+ if (subtype_opt == NULL) {
+ fuse_log(FUSE_LOG_ERR, "fuse: memory allocation failed\n");
+ return -1;
+ }
+#ifdef __FreeBSD__
+ sprintf(subtype_opt, "-ofsname=%s", basename);
+#else
+ sprintf(subtype_opt, "-osubtype=%s", basename);
+#endif
+ res = fuse_opt_add_arg(args, subtype_opt);
+ free(subtype_opt);
+ return res;
+}
+
+int fuse_parse_cmdline(struct fuse_args *args,
+ struct fuse_cmdline_opts *opts)
+{
+ memset(opts, 0, sizeof(struct fuse_cmdline_opts));
+
+ opts->max_idle_threads = 10;
+
+ if (fuse_opt_parse(args, opts, fuse_helper_opts,
+ fuse_helper_opt_proc) == -1)
+ return -1;
+
+ /* *Linux*: if neither -o subtype nor -o fsname are specified,
+ set subtype to program's basename.
+ *FreeBSD*: if fsname is not specified, set to program's
+ basename. */
+ if (!opts->nodefault_subtype)
+ if (add_default_subtype(args->argv[0], args) == -1)
+ return -1;
+
+ return 0;
+}
+
+
+int fuse_daemonize(int foreground)
+{
+ if (!foreground) {
+ int nullfd;
+ int waiter[2];
+ char completed;
+
+ if (pipe(waiter)) {
+ perror("fuse_daemonize: pipe");
+ return -1;
+ }
+
+ /*
+ * demonize current process by forking it and killing the
+ * parent. This makes current process as a child of 'init'.
+ */
+ switch(fork()) {
+ case -1:
+ perror("fuse_daemonize: fork");
+ return -1;
+ case 0:
+ break;
+ default:
+ (void) read(waiter[0], &completed, sizeof(completed));
+ _exit(0);
+ }
+
+ if (setsid() == -1) {
+ perror("fuse_daemonize: setsid");
+ return -1;
+ }
+
+ (void) chdir("/");
+
+ nullfd = open("/dev/null", O_RDWR, 0);
+ if (nullfd != -1) {
+ (void) dup2(nullfd, 0);
+ (void) dup2(nullfd, 1);
+ (void) dup2(nullfd, 2);
+ if (nullfd > 2)
+ close(nullfd);
+ }
+
+ /* Propagate completion of daemon initialization */
+ completed = 1;
+ (void) write(waiter[1], &completed, sizeof(completed));
+ close(waiter[0]);
+ close(waiter[1]);
+ } else {
+ (void) chdir("/");
+ }
+ return 0;
+}
+
+int fuse_main_real(int argc, char *argv[], const struct fuse_operations *op,
+ size_t op_size, void *user_data)
+{
+ struct fuse_args args = FUSE_ARGS_INIT(argc, argv);
+ struct fuse *fuse;
+ struct fuse_cmdline_opts opts;
+ int res;
+
+ if (fuse_parse_cmdline(&args, &opts) != 0)
+ return 1;
+
+ if (opts.show_version) {
+ printf("FUSE library version %s\n", PACKAGE_VERSION);
+ fuse_lowlevel_version();
+ res = 0;
+ goto out1;
+ }
+
+ if (opts.show_help) {
+ if(args.argv[0][0] != '\0')
+ printf("usage: %s [options] <mountpoint>\n\n",
+ args.argv[0]);
+ printf("FUSE options:\n");
+ fuse_cmdline_help();
+ fuse_lib_help(&args);
+ res = 0;
+ goto out1;
+ }
+
+ if (!opts.show_help &&
+ !opts.mountpoint) {
+ fuse_log(FUSE_LOG_ERR, "error: no mountpoint specified\n");
+ res = 2;
+ goto out1;
+ }
+
+
+ fuse = fuse_new_31(&args, op, op_size, user_data);
+ if (fuse == NULL) {
+ res = 3;
+ goto out1;
+ }
+
+ if (fuse_mount(fuse,opts.mountpoint) != 0) {
+ res = 4;
+ goto out2;
+ }
+
+ if (fuse_daemonize(opts.foreground) != 0) {
+ res = 5;
+ goto out3;
+ }
+
+ struct fuse_session *se = fuse_get_session(fuse);
+ if (fuse_set_signal_handlers(se) != 0) {
+ res = 6;
+ goto out3;
+ }
+
+ if (opts.singlethread)
+ res = fuse_loop(fuse);
+ else {
+ struct fuse_loop_config loop_config;
+ loop_config.clone_fd = opts.clone_fd;
+ loop_config.max_idle_threads = opts.max_idle_threads;
+ res = fuse_loop_mt_32(fuse, &loop_config);
+ }
+ if (res)
+ res = 7;
+
+ fuse_remove_signal_handlers(se);
+out3:
+ fuse_unmount(fuse);
+out2:
+ fuse_destroy(fuse);
+out1:
+ free(opts.mountpoint);
+ fuse_opt_free_args(&args);
+ return res;
+}
+
+
+void fuse_apply_conn_info_opts(struct fuse_conn_info_opts *opts,
+ struct fuse_conn_info *conn)
+{
+ if(opts->set_max_write)
+ conn->max_write = opts->max_write;
+ if(opts->set_max_background)
+ conn->max_background = opts->max_background;
+ if(opts->set_congestion_threshold)
+ conn->congestion_threshold = opts->congestion_threshold;
+ if(opts->set_time_gran)
+ conn->time_gran = opts->time_gran;
+ if(opts->set_max_readahead)
+ conn->max_readahead = opts->max_readahead;
+
+#define LL_ENABLE(cond,cap) \
+ if (cond) conn->want |= (cap)
+#define LL_DISABLE(cond,cap) \
+ if (cond) conn->want &= ~(cap)
+
+ LL_ENABLE(opts->splice_read, FUSE_CAP_SPLICE_READ);
+ LL_DISABLE(opts->no_splice_read, FUSE_CAP_SPLICE_READ);
+
+ LL_ENABLE(opts->splice_write, FUSE_CAP_SPLICE_WRITE);
+ LL_DISABLE(opts->no_splice_write, FUSE_CAP_SPLICE_WRITE);
+
+ LL_ENABLE(opts->splice_move, FUSE_CAP_SPLICE_MOVE);
+ LL_DISABLE(opts->no_splice_move, FUSE_CAP_SPLICE_MOVE);
+
+ LL_ENABLE(opts->auto_inval_data, FUSE_CAP_AUTO_INVAL_DATA);
+ LL_DISABLE(opts->no_auto_inval_data, FUSE_CAP_AUTO_INVAL_DATA);
+
+ LL_DISABLE(opts->no_readdirplus, FUSE_CAP_READDIRPLUS);
+ LL_DISABLE(opts->no_readdirplus_auto, FUSE_CAP_READDIRPLUS_AUTO);
+
+ LL_ENABLE(opts->async_dio, FUSE_CAP_ASYNC_DIO);
+ LL_DISABLE(opts->no_async_dio, FUSE_CAP_ASYNC_DIO);
+
+ LL_ENABLE(opts->writeback_cache, FUSE_CAP_WRITEBACK_CACHE);
+ LL_DISABLE(opts->no_writeback_cache, FUSE_CAP_WRITEBACK_CACHE);
+
+ LL_ENABLE(opts->async_read, FUSE_CAP_ASYNC_READ);
+ LL_DISABLE(opts->sync_read, FUSE_CAP_ASYNC_READ);
+
+ LL_DISABLE(opts->no_remote_posix_lock, FUSE_CAP_POSIX_LOCKS);
+ LL_DISABLE(opts->no_remote_flock, FUSE_CAP_FLOCK_LOCKS);
+}
+
+struct fuse_conn_info_opts* fuse_parse_conn_info_opts(struct fuse_args *args)
+{
+ struct fuse_conn_info_opts *opts;
+
+ opts = calloc(1, sizeof(struct fuse_conn_info_opts));
+ if(opts == NULL) {
+ fuse_log(FUSE_LOG_ERR, "calloc failed\n");
+ return NULL;
+ }
+ if(fuse_opt_parse(args, opts, conn_info_opt_spec, NULL) == -1) {
+ free(opts);
+ return NULL;
+ }
+ return opts;
+}
+
+int fuse_open_channel(const char *mountpoint, const char* options)
+{
+ struct mount_opts *opts = NULL;
+ int fd = -1;
+ const char *argv[] = { "", "-o", options };
+ int argc = sizeof(argv) / sizeof(argv[0]);
+ struct fuse_args args = FUSE_ARGS_INIT(argc, (char**) argv);
+
+ opts = parse_mount_opts(&args);
+ if (opts == NULL)
+ return -1;
+
+ fd = fuse_kern_mount(mountpoint, opts);
+ destroy_mount_opts(opts);
+
+ return fd;
+}
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