[systemd-devel] [PATCH 1/9] fsckd daemon for inter-fsckd communication
Zbigniew Jędrzejewski-Szmek
zbyszek at in.waw.pl
Sat Feb 14 08:21:44 PST 2015
On Thu, Feb 05, 2015 at 06:06:50PM +0100, Didier Roche wrote:
> Hey,
>
> Posting the new set of patches for the fsck/plymouth integration,
> rebased from all the comments and the systemd event loop system.
>
> This version talks the raw plymouth protocol directly, supporting
> only what is needed (sending updates, messages, requesting key
> listening, get key events). It's using Control+C as the cancellation
> key. If plymouth disconnects and then later respawn, the connection
> will be taken back. Same for any new fsck connection incoming after
> a cancellation (they will get cancelled right away). The update
> progress message is always reflecting the current connection state
> (they will only disappear once they are actually cleaned).
>
> As always, I'm opened to any comments.
> Cheers,
> Didier
> From ac8d6f10768a5bcba0b7932547419637983637b2 Mon Sep 17 00:00:00 2001
> From: Didier Roche <didrocks at ubuntu.com>
> Date: Wed, 4 Feb 2015 16:42:47 +0100
> Subject: [PATCH 1/9] fsckd daemon for inter-fsckd communication
>
> Add systemd-fsckd multiplexer which accepts multiple systemd-fsck
> instances to connect to it and sends progress report. systemd-fsckd then
> computes and writes to /dev/console the number of devices currently being
> checked and the minimum fsck progress. This will be used for interactive
> progress report and cancelling in plymouth.
>
> systemd-fsckd stops on idle when no systemd-fsck is connected.
>
> Make the necessary changes to systemd-fsck to connect to the systemd-fsckd
> socket.
> ---
> .gitignore | 1 +
> Makefile.am | 13 ++
> src/fsck/fsck.c | 88 +++++-------
> src/fsckd/Makefile | 1 +
> src/fsckd/fsckd.c | 403 +++++++++++++++++++++++++++++++++++++++++++++++++++++
> src/fsckd/fsckd.h | 34 +++++
> 6 files changed, 486 insertions(+), 54 deletions(-)
> create mode 120000 src/fsckd/Makefile
> create mode 100644 src/fsckd/fsckd.c
> create mode 100644 src/fsckd/fsckd.h
>
> diff --git a/.gitignore b/.gitignore
> index ab6d9d1..9400e75 100644
> --- a/.gitignore
> +++ b/.gitignore
> @@ -74,6 +74,7 @@
> /systemd-evcat
> /systemd-firstboot
> /systemd-fsck
> +/systemd-fsckd
> /systemd-fstab-generator
> /systemd-getty-generator
> /systemd-gnome-ask-password-agent
> diff --git a/Makefile.am b/Makefile.am
> index c463f23..e0e8bc6 100644
> --- a/Makefile.am
> +++ b/Makefile.am
> @@ -389,6 +389,7 @@ rootlibexec_PROGRAMS = \
> systemd-remount-fs \
> systemd-reply-password \
> systemd-fsck \
> + systemd-fsckd \
> systemd-machine-id-commit \
> systemd-ac-power \
> systemd-sysctl \
> @@ -2355,6 +2356,18 @@ systemd_fsck_LDADD = \
> libsystemd-shared.la
>
> # ------------------------------------------------------------------------------
> +systemd_fsckd_SOURCES = \
> + src/fsckd/fsckd.c \
> + $(NULL)
> +
> +systemd_fsckd_LDADD = \
> + libsystemd-internal.la \
> + libsystemd-label.la \
> + libsystemd-shared.la \
> + libudev-internal.la \
> + $(NULL)
> +
> +# ------------------------------------------------------------------------------
> systemd_machine_id_commit_SOURCES = \
> src/machine-id-commit/machine-id-commit.c \
> src/core/machine-id-setup.c \
> diff --git a/src/fsck/fsck.c b/src/fsck/fsck.c
> index 20b7940..9d9739b 100644
> --- a/src/fsck/fsck.c
> +++ b/src/fsck/fsck.c
> @@ -27,6 +27,7 @@
> #include <unistd.h>
> #include <fcntl.h>
> #include <sys/file.h>
> +#include <sys/stat.h>
>
> #include "sd-bus.h"
> #include "libudev.h"
> @@ -39,6 +40,8 @@
> #include "fileio.h"
> #include "udev-util.h"
> #include "path-util.h"
> +#include "socket-util.h"
> +#include "fsckd/fsckd.h"
>
> static bool arg_skip = false;
> static bool arg_force = false;
> @@ -132,58 +135,42 @@ static void test_files(void) {
> arg_show_progress = true;
> }
>
> -static double percent(int pass, unsigned long cur, unsigned long max) {
> - /* Values stolen from e2fsck */
> -
> - static const int pass_table[] = {
> - 0, 70, 90, 92, 95, 100
> +static int process_progress(int fd, dev_t device_num) {
> + _cleanup_fclose_ FILE *f = NULL;
> + usec_t last = 0;
> + _cleanup_close_ int fsckd_fd = -1;
> + static const union sockaddr_union sa = {
> + .un.sun_family = AF_UNIX,
> + .un.sun_path = FSCKD_SOCKET_PATH,
> };
>
> - if (pass <= 0)
> - return 0.0;
> -
> - if ((unsigned) pass >= ELEMENTSOF(pass_table) || max == 0)
> - return 100.0;
> -
> - return (double) pass_table[pass-1] +
> - ((double) pass_table[pass] - (double) pass_table[pass-1]) *
> - (double) cur / (double) max;
> -}
> -
> -static int process_progress(int fd) {
> - _cleanup_fclose_ FILE *console = NULL, *f = NULL;
> - usec_t last = 0;
> - bool locked = false;
> - int clear = 0;
> + fsckd_fd = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0);
> + if (fsckd_fd < 0) {
> + log_warning_errno(errno, "Cannot open fsckd socket, we won't report fsck progress: %m");
> + return -errno;
> + }
> + if (connect(fsckd_fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path)) < 0) {
> + log_warning_errno(errno, "Cannot connect to fsckd socket, we won't report fsck progress: %m");
> + return -errno;
Use 'return log_warning_errno(...)'.
> + }
>
> f = fdopen(fd, "r");
> if (!f) {
> - safe_close(fd);
> + log_warning_errno(errno, "Cannot connect to fsck, we won't report fsck progress: %m");
> return -errno;
> }
>
> - console = fopen("/dev/console", "we");
> - if (!console)
> - return -ENOMEM;
> -
> while (!feof(f)) {
> - int pass, m;
> - unsigned long cur, max;
> - _cleanup_free_ char *device = NULL;
> - double p;
> + int pass;
> + size_t cur, max;
> + ssize_t n;
> usec_t t;
> + _cleanup_free_ char *device = NULL;
> + FsckProgress progress;
>
> if (fscanf(f, "%i %lu %lu %ms", &pass, &cur, &max, &device) != 4)
> break;
>
> - /* Only show one progress counter at max */
> - if (!locked) {
> - if (flock(fileno(console), LOCK_EX|LOCK_NB) < 0)
> - continue;
> -
> - locked = true;
> - }
> -
> /* Only update once every 50ms */
> t = now(CLOCK_MONOTONIC);
> if (last + 50 * USEC_PER_MSEC > t)
> @@ -191,22 +178,15 @@ static int process_progress(int fd) {
>
> last = t;
>
> - p = percent(pass, cur, max);
> - fprintf(console, "\r%s: fsck %3.1f%% complete...\r%n", device, p, &m);
> - fflush(console);
> -
> - if (m > clear)
> - clear = m;
> - }
> -
> - if (clear > 0) {
> - unsigned j;
> + /* send progress to fsckd */
> + progress.devnum = device_num;
> + progress.cur = cur;
> + progress.max = max;
> + progress.pass = pass;
>
> - fputc('\r', console);
> - for (j = 0; j < (unsigned) clear; j++)
> - fputc(' ', console);
> - fputc('\r', console);
> - fflush(console);
> + n = send(fsckd_fd, &progress, sizeof(FsckProgress), 0);
> + if (n < 0 || (size_t) n < sizeof(FsckProgress))
> + log_warning_errno(errno, "Cannot communicate fsck progress to fsckd: %m");
> }
>
> return 0;
> @@ -359,7 +339,7 @@ int main(int argc, char *argv[]) {
> progress_pipe[1] = safe_close(progress_pipe[1]);
>
> if (progress_pipe[0] >= 0) {
> - process_progress(progress_pipe[0]);
> + process_progress(progress_pipe[0], st.st_rdev);
> progress_pipe[0] = -1;
> }
>
> diff --git a/src/fsckd/Makefile b/src/fsckd/Makefile
> new file mode 120000
> index 0000000..d0b0e8e
> --- /dev/null
> +++ b/src/fsckd/Makefile
> @@ -0,0 +1 @@
> +../Makefile
> \ No newline at end of file
> diff --git a/src/fsckd/fsckd.c b/src/fsckd/fsckd.c
> new file mode 100644
> index 0000000..4a16f3d
> --- /dev/null
> +++ b/src/fsckd/fsckd.c
> @@ -0,0 +1,403 @@
> +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
> +
> +/***
> + This file is part of systemd.
> +
> + Copyright 2015 Canonical
> +
> + Author:
> + Didier Roche <didrocks at ubuntu.com>
> +
> + systemd is free software; you can redistribute it and/or modify it
> + under the terms of the GNU Lesser General Public License as published by
> + the Free Software Foundation; either version 2.1 of the License, or
> + (at your option) any later version.
> +
> + systemd is distributed in the hope that it will be useful, but
> + WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public License
> + along with systemd; If not, see <http://www.gnu.org/licenses/>.
> +***/
> +
> +#include <getopt.h>
> +#include <errno.h>
> +#include <math.h>
> +#include <stdbool.h>
> +#include <stdlib.h>
> +#include <stdio.h>
> +#include <sys/socket.h>
> +#include <sys/types.h>
> +#include <sys/un.h>
> +#include <unistd.h>
> +
> +#include "build.h"
> +#include "event-util.h"
> +#include "fsckd.h"
> +#include "log.h"
> +#include "list.h"
> +#include "macro.h"
> +#include "sd-daemon.h"
> +#include "socket-util.h"
> +#include "util.h"
> +
> +#define IDLE_TIME_SECONDS 30
> +
> +struct Manager;
> +
> +typedef struct Client {
> + struct Manager *manager;
> + int fd;
> + dev_t devnum;
> + size_t cur;
> + size_t max;
> + int pass;
> + double percent;
> + size_t buflen;
> +
> + LIST_FIELDS(struct Client, clients);
> +} Client;
> +
> +typedef struct Manager {
> + sd_event *event;
> + Client *clients;
> + int clear;
> + int connection_fd;
> + FILE *console;
> + double percent;
> + int numdevices;
> +} Manager;
> +
> +static void manager_free(Manager *m);
> +DEFINE_TRIVIAL_CLEANUP_FUNC(Manager*, manager_free);
> +#define _cleanup_manager_free_ _cleanup_(manager_freep)
> +
> +static double compute_percent(int pass, size_t cur, size_t max) {
> + /* Values stolen from e2fsck */
> +
> + static const double pass_table[] = {
> + 0, 70, 90, 92, 95, 100
> + };
> +
> + if (pass <= 0)
> + return 0.0;
> +
> + if ((unsigned) pass >= ELEMENTSOF(pass_table) || max == 0)
> + return 100.0;
> +
> + return pass_table[pass-1] +
> + (pass_table[pass] - pass_table[pass-1]) *
> + (double) cur / max;
> +}
> +
> +
> +static void remove_client(Client **first, Client *item) {
> + LIST_REMOVE(clients, *first, item);
> + safe_close(item->fd);
> + free(item);
> +}
> +
> +static int update_global_progress(Manager *m) {
> + Client *current = NULL;
> + _cleanup_free_ char *console_message = NULL;
> + int current_numdevices = 0, l = 0;
> + double current_percent = 100;
> +
> + /* get the overall percentage */
> + LIST_FOREACH(clients, current, m->clients) {
> + current_numdevices++;
> +
> + /* right now, we only keep the minimum % of all fsckd processes. We could in the future trying to be
> + linear, but max changes and corresponds to the pass. We have all the informations into fsckd
> + already if we can treat that in a smarter way. */
> + current_percent = MIN(current_percent, current->percent);
> + }
> +
> + /* update if there is anything user-visible to update */
> + if (fabs(current_percent - m->percent) > 0.001 || current_numdevices != m->numdevices) {
> + m->numdevices = current_numdevices;
> + m->percent = current_percent;
> +
> + if (asprintf(&console_message, "Checking in progress on %d disks (%3.1f%% complete)",
> + m->numdevices, m->percent) < 0)
> + return -ENOMEM;
> +
> + /* write to console */
> + if (m->console) {
> + fprintf(m->console, "\r%s\r%n", console_message, &l);
> + fflush(m->console);
> + }
> +
> + if (l > m->clear)
> + m->clear = l;
> + }
> + return 0;
> +}
> +
> +static int progress_handler(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
> + Client *client = userdata;
> + Manager *m = NULL;
> + FsckProgress fsck_data;
> + size_t buflen;
> + int r;
> +
> + assert(client);
> + m = client->manager;
> +
> + /* ensure we have enough data to read */
> + r = ioctl(fd, FIONREAD, &buflen);
> + if (r == 0 && buflen != 0 && (size_t) buflen < sizeof(FsckProgress)) {
> + if (client->buflen != buflen)
> + client->buflen = buflen;
> + /* we got twice the same size from a bad behaving client, kick it off the list */
> + else {
Shouldn't this be logged? Seems like this should be detected and fixed
if it happens.
> + remove_client(&(m->clients), client);
> + r = update_global_progress(m);
> + if (r < 0)
> + log_warning_errno(r, "Couldn't update global progress: %m");
> + }
> + return 0;
> + }
> +
> + /* read actual data */
> + r = recv(fd, &fsck_data, sizeof(FsckProgress), 0);
> + if (r == 0) {
> + log_debug("Fsck client connected to fd %d disconnected", client->fd);
> + remove_client(&(m->clients), client);
> + } else if (r > 0 && r != sizeof(FsckProgress))
> + log_warning("Unexpected data structure sent to fsckd socket from fd: %d. Ignoring", client->fd);
> + else if (r > 0 && r == sizeof(FsckProgress)) {
> + client->devnum = fsck_data.devnum;
> + client->cur = fsck_data.cur;
> + client->max = fsck_data.max;
> + client->pass = fsck_data.pass;
> + client->percent = compute_percent(client->pass, client->cur, client->max);
> + log_debug("Getting progress for %u:%u (%lu, %lu, %d) : %3.1f%%",
> + major(client->devnum), minor(client->devnum),
> + client->cur, client->max, client->pass, client->percent);
> + } else
> + log_error_errno(r, "Unknown error while trying to read fsck data: %m");
> +
> + r = update_global_progress(m);
> + if (r < 0)
> + log_warning_errno(r, "Couldn't update global progress: %m");
> +
> + return 0;
> +}
> +
> +static int new_connection_handler(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
> + Manager *m = userdata;
> + Client *client = NULL;
> + int new_client_fd, r;
> +
> + assert(m);
> +
> + /* Initialize and list new clients */
> + new_client_fd = accept4(m->connection_fd, NULL, NULL, SOCK_CLOEXEC);
> + if (new_client_fd > 0) {
> + log_debug("New fsck client connected to fd: %d", new_client_fd);
> + client = new0(Client, 1);
> + if (!client)
> + return log_oom();
> + client->fd = new_client_fd;
> + client->manager = m;
> + LIST_PREPEND(clients, m->clients, client);
> + r = sd_event_add_io(m->event, NULL, client->fd, EPOLLIN, progress_handler, client);
> + if (r < 0) {
> + remove_client(&(m->clients), client);
> + return r;
> + }
> + } else
> + return log_error_errno(errno, "Couldn't accept a new connection: %m");
> +
> + return 0;
> +}
> +
> +static void manager_free(Manager *m) {
> + Client *current = NULL, *l = NULL;
> + if (!m)
> + return;
> +
> + /* clear last line */
> + if (m->console && m->clear > 0) {
> + unsigned j;
> +
> + fputc('\r', m->console);
> + for (j = 0; j < (unsigned) m->clear; j++)
> + fputc(' ', m->console);
> + fputc('\r', m->console);
> + fflush(m->console);
> + }
> +
> + safe_close(m->connection_fd);
> + if (m->console)
> + fclose(m->console);
> +
> + LIST_FOREACH_SAFE(clients, current, l, m->clients)
> + remove_client(&(m->clients), current);
> +
> + sd_event_unref(m->event);
> +
> + free(m);
> +}
> +
> +static int manager_new(Manager **ret, int fd) {
> + _cleanup_manager_free_ Manager *m = NULL;
> + int r;
> +
> + assert(ret);
> +
> + m = new0(Manager, 1);
> + if (!m)
> + return -ENOMEM;
> +
> + r = sd_event_default(&m->event);
> + if (r < 0)
> + return r;
> +
> + m->connection_fd = fd;
> + m->console = fopen("/dev/console", "we");
> + if (!m->console)
> + return log_warning_errno(errno, "Can't connect to /dev/console: %m");
> + m->percent = 100;
> +
> + *ret = m;
> + m = NULL;
> +
> + return 0;
> +}
> +
> +static int run_event_loop_with_timeout(sd_event *e, usec_t timeout) {
> + int r, code;
> +
> + assert(e);
> +
> + for (;;) {
> + r = sd_event_get_state(e);
> + if (r < 0)
> + return r;
> + if (r == SD_EVENT_FINISHED)
> + break;
> +
> + r = sd_event_run(e, timeout);
> + if (r < 0)
> + return r;
> +
> + /* timeout reached */
> + if (r == 0) {
> + sd_event_exit(e, 0);
> + break;
> + }
> + }
> +
> + r = sd_event_get_exit_code(e, &code);
> + if (r < 0)
> + return r;
> +
> + return code;
> +}
> +
> +static void help(void) {
> + printf("%s [OPTIONS...]\n\n"
> + "Capture fsck progress and forward one stream to plymouth\n\n"
> + " -h --help Show this help\n"
> + " --version Show package version\n",
> + program_invocation_short_name);
> +}
> +
> +static int parse_argv(int argc, char *argv[]) {
> +
> + enum {
> + ARG_VERSION = 0x100,
> + ARG_ROOT,
> + };
> +
> + static const struct option options[] = {
> + { "help", no_argument, NULL, 'h' },
> + { "version", no_argument, NULL, ARG_VERSION },
> + {}
> + };
> +
> + int c;
> +
> + assert(argc >= 0);
> + assert(argv);
> +
> + while ((c = getopt_long(argc, argv, "hv", options, NULL)) >= 0)
> + switch (c) {
> +
> + case 'h':
> + help();
> + return 0;
> +
> + case ARG_VERSION:
> + puts(PACKAGE_STRING);
> + puts(SYSTEMD_FEATURES);
> + return 0;
> +
> + case '?':
> + return -EINVAL;
> +
> + default:
> + assert_not_reached("Unhandled option");
> + }
> +
> + if (optind < argc) {
> + log_error("Extraneous arguments");
> + return -EINVAL;
> + }
> +
> + return 1;
> +}
> +
> +int main(int argc, char *argv[]) {
> + _cleanup_manager_free_ Manager *m = NULL;
> + int fd = -1;
> + int r, n;
> +
> + log_set_target(LOG_TARGET_AUTO);
> + log_parse_environment();
> + log_open();
> +
> + r = parse_argv(argc, argv);
> + if (r <= 0)
> + return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
> +
> + n = sd_listen_fds(0);
> + if (n > 1) {
> + log_error("Too many file descriptors received.");
> + return EXIT_FAILURE;
> + } else if (n == 1) {
> + fd = SD_LISTEN_FDS_START + 0;
> + } else {
> + fd = make_socket_fd(LOG_DEBUG, FSCKD_SOCKET_PATH, SOCK_STREAM | SOCK_CLOEXEC);
> + if (fd < 0) {
> + log_error_errno(r, "Couldn't create listening socket fd on %s: %m", FSCKD_SOCKET_PATH);
> + return EXIT_FAILURE;
> + }
> + }
> +
> + r = manager_new(&m, fd);
> + if (r < 0) {
> + log_error_errno(r, "Failed to allocate manager: %m");
> + return EXIT_FAILURE;
> + }
> +
> + r = sd_event_add_io(m->event, NULL, fd, EPOLLIN, new_connection_handler, m);
> + if (r < 0) {
> + log_error_errno(r, "Can't listen to connection socket: %m");
> + return EXIT_FAILURE;
> + }
> +
> + r = run_event_loop_with_timeout(m->event, IDLE_TIME_SECONDS * USEC_PER_SEC);
> + if (r < 0) {
> + log_error_errno(r, "Failed to run event loop: %m");
> + return EXIT_FAILURE;
> + }
> +
> + sd_event_get_exit_code(m->event, &r);
> +
> + return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
> +}
> diff --git a/src/fsckd/fsckd.h b/src/fsckd/fsckd.h
> new file mode 100644
> index 0000000..6fe37a7
> --- /dev/null
> +++ b/src/fsckd/fsckd.h
> @@ -0,0 +1,34 @@
> +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
> +
> +/***
> + This file is part of systemd.
> +
> + Copyright 2015 Canonical
> +
> + Author:
> + Didier Roche <didrocks at ubuntu.com>
> +
> + systemd is free software; you can redistribute it and/or modify it
> + under the terms of the GNU Lesser General Public License as published by
> + the Free Software Foundation; either version 2.1 of the License, or
> + (at your option) any later version.
> +
> + systemd is distributed in the hope that it will be useful, but
> + WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public License
> + along with systemd; If not, see <http://www.gnu.org/licenses/>.
> +***/
> +
> +#define FSCKD_SOCKET_PATH "/run/systemd/fsckd"
> +
> +#include "libudev.h"
> +
> +typedef struct FsckProgress {
> + dev_t devnum;
> + size_t cur;
> + size_t max;
> + int pass;
> +} FsckProgress;
> --
> 2.1.4
>
Zbyszek
More information about the systemd-devel
mailing list