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Diffstat (limited to 'tools/virtiofsd/helper.c')
| -rw-r--r-- | tools/virtiofsd/helper.c | 409 |
1 files changed, 0 insertions, 409 deletions
diff --git a/tools/virtiofsd/helper.c b/tools/virtiofsd/helper.c deleted file mode 100644 index f5f66f292c..0000000000 --- a/tools/virtiofsd/helper.c +++ /dev/null @@ -1,409 +0,0 @@ -/* - * 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 "qemu/osdep.h" -#include "fuse_i.h" -#include "fuse_lowlevel.h" -#include "fuse_misc.h" -#include "fuse_opt.h" - -#include <sys/param.h> -#include <sys/resource.h> - -#define FUSE_HELPER_OPT(t, p) \ - { \ - t, offsetof(struct fuse_cmdline_opts, p), 1 \ - } -#define FUSE_HELPER_OPT_VALUE(t, p, v) \ - { \ - t, offsetof(struct fuse_cmdline_opts, p), v \ - } - -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("--print-capabilities", print_capabilities), - 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_VALUE("--daemonize", foreground, 0), - FUSE_HELPER_OPT("fsname=", nodefault_subtype), - FUSE_OPT_KEY("fsname=", FUSE_OPT_KEY_KEEP), - FUSE_HELPER_OPT("subtype=", nodefault_subtype), - FUSE_OPT_KEY("subtype=", FUSE_OPT_KEY_KEEP), - FUSE_HELPER_OPT("max_idle_threads=%u", max_idle_threads), - FUSE_HELPER_OPT("--rlimit-nofile=%lu", rlimit_nofile), - FUSE_HELPER_OPT("--syslog", syslog), - FUSE_HELPER_OPT_VALUE("log_level=debug", log_level, FUSE_LOG_DEBUG), - FUSE_HELPER_OPT_VALUE("log_level=info", log_level, FUSE_LOG_INFO), - FUSE_HELPER_OPT_VALUE("log_level=warn", log_level, FUSE_LOG_WARNING), - FUSE_HELPER_OPT_VALUE("log_level=err", log_level, FUSE_LOG_ERR), - 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" - " --print-capabilities print vhost-user.json\n" - " -d -o debug enable debug output (implies -f)\n" - " --syslog log to syslog (default stderr)\n" - " -f foreground operation\n" - " --daemonize run in background\n" - " -o cache=<mode> cache mode. could be one of \"auto, " - "always, none\"\n" - " default: auto\n" - " -o flock|no_flock enable/disable flock\n" - " default: no_flock\n" - " -o log_level=<level> log level, default to \"info\"\n" - " level could be one of \"debug, " - "info, warn, err\"\n" - " -o max_idle_threads the maximum number of idle worker " - "threads\n" - " allowed (default: 10)\n" - " -o posix_lock|no_posix_lock\n" - " enable/disable remote posix lock\n" - " default: no_posix_lock\n" - " -o readdirplus|no_readdirplus\n" - " enable/disable readirplus\n" - " default: readdirplus except with " - "cache=none\n" - " -o sandbox=namespace|chroot\n" - " sandboxing mode:\n" - " - namespace: mount, pid, and net\n" - " namespaces with pivot_root(2)\n" - " into shared directory\n" - " - chroot: chroot(2) into shared\n" - " directory (use in containers)\n" - " default: namespace\n" - " -o timeout=<number> I/O timeout (seconds)\n" - " default: depends on cache= option.\n" - " -o writeback|no_writeback enable/disable writeback cache\n" - " default: no_writeback\n" - " -o xattr|no_xattr enable/disable xattr\n" - " default: no_xattr\n" - " -o xattrmap=<mapping> Enable xattr mapping (enables xattr)\n" - " <mapping> is a string consists of a series of rules\n" - " e.g. -o xattrmap=:map::user.virtiofs.:\n" - " -o modcaps=CAPLIST Modify the list of capabilities\n" - " e.g. -o modcaps=+sys_admin:-chown\n" - " --rlimit-nofile=<num> set maximum number of file descriptors\n" - " (0 leaves rlimit unchanged)\n" - " default: min(1000000, fs.file-max - 16384)\n" - " if the current rlimit is lower\n" - " -o allow_direct_io|no_allow_direct_io\n" - " retain/discard O_DIRECT flags passed down\n" - " to virtiofsd from guest applications.\n" - " default: no_allow_direct_io\n" - " -o announce_submounts Announce sub-mount points to the guest\n" - " -o posix_acl/no_posix_acl Enable/Disable posix_acl. (default: disabled)\n" - " -o security_label/no_security_label Enable/Disable security label. (default: disabled)\n" - " -o killpriv_v2/no_killpriv_v2\n" - " Enable/Disable FUSE_HANDLE_KILLPRIV_V2.\n" - " (default: enabled as long as client supports it)\n" - ); -} - -static int fuse_helper_opt_proc(void *data, const char *arg, int key, - struct fuse_args *outargs) -{ - (void)data; - (void)outargs; - - switch (key) { - case FUSE_OPT_KEY_NONOPT: - fuse_log(FUSE_LOG_ERR, "fuse: invalid argument `%s'\n", arg); - return -1; - - default: - /* Pass through unknown options */ - return 1; - } -} - -static unsigned long get_default_rlimit_nofile(void) -{ - g_autofree gchar *file_max_str = NULL; - const rlim_t reserved_fds = 16384; /* leave at least this many fds free */ - rlim_t max_fds = 1000000; /* our default RLIMIT_NOFILE target */ - rlim_t file_max; - struct rlimit rlim; - - /* - * Reduce max_fds below the system-wide maximum, if necessary. This - * ensures there are fds available for other processes so we don't - * cause resource exhaustion. - */ - if (!g_file_get_contents("/proc/sys/fs/file-max", &file_max_str, - NULL, NULL)) { - fuse_log(FUSE_LOG_ERR, "can't read /proc/sys/fs/file-max\n"); - exit(1); - } - file_max = g_ascii_strtoull(file_max_str, NULL, 10); - if (file_max < 2 * reserved_fds) { - fuse_log(FUSE_LOG_ERR, - "The fs.file-max sysctl is too low (%lu) to allow a " - "reasonable number of open files.\n", - (unsigned long)file_max); - exit(1); - } - max_fds = MIN(file_max - reserved_fds, max_fds); - - if (getrlimit(RLIMIT_NOFILE, &rlim) < 0) { - fuse_log(FUSE_LOG_ERR, "getrlimit(RLIMIT_NOFILE): %m\n"); - exit(1); - } - - if (rlim.rlim_cur >= max_fds) { - return 0; /* we have more fds available than required! */ - } - return max_fds; -} - -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; - opts->rlimit_nofile = get_default_rlimit_nofile(); - opts->foreground = 1; - - if (fuse_opt_parse(args, opts, fuse_helper_opts, fuse_helper_opt_proc) == - -1) { - return -1; - } - - return 0; -} - - -int fuse_daemonize(int foreground) -{ - int ret = 0, rett; - if (!foreground) { - int nullfd; - int waiter[2]; - char completed; - - if (!g_unix_open_pipe(waiter, FD_CLOEXEC, NULL)) { - fuse_log(FUSE_LOG_ERR, "fuse_daemonize: pipe: %s\n", - strerror(errno)); - 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: - fuse_log(FUSE_LOG_ERR, "fuse_daemonize: fork: %s\n", - strerror(errno)); - return -1; - case 0: - break; - default: - _exit(read(waiter[0], &completed, - sizeof(completed) != sizeof(completed))); - } - - if (setsid() == -1) { - fuse_log(FUSE_LOG_ERR, "fuse_daemonize: setsid: %s\n", - strerror(errno)); - return -1; - } - - ret = chdir("/"); - - nullfd = open("/dev/null", O_RDWR, 0); - if (nullfd != -1) { - rett = dup2(nullfd, 0); - if (!ret) { - ret = rett; - } - rett = dup2(nullfd, 1); - if (!ret) { - ret = rett; - } - rett = dup2(nullfd, 2); - if (!ret) { - ret = rett; - } - if (nullfd > 2) { - close(nullfd); - } - } - - /* Propagate completion of daemon initialization */ - completed = 1; - rett = write(waiter[1], &completed, sizeof(completed)); - if (!ret) { - ret = rett; - } - close(waiter[0]); - close(waiter[1]); - } else { - ret = chdir("/"); - } - return ret; -} - -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; -} |