From 47cb901e38cd7092576fc8e76cc4a14f39bf719d Mon Sep 17 00:00:00 2001 From: Lennart Poettering Date: Tue, 28 Oct 2014 14:24:46 +0100 Subject: [PATCH] swap: replace Discard= setting by a more generic Options= setting For now, it's systemd itself that parses the options string, but as soon as util-linux' swapon can take the option string directly with -o we should pass it on unmodified. --- man/systemd.swap.xml | 16 ++--- src/core/dbus-swap.c | 13 ++-- src/core/load-fragment-gperf.gperf.m4 | 2 +- src/core/swap.c | 91 +++++++++++++++++++++++---- src/core/swap.h | 2 +- src/fstab-generator/fstab-generator.c | 56 +++-------------- 6 files changed, 103 insertions(+), 77 deletions(-) diff --git a/man/systemd.swap.xml b/man/systemd.swap.xml index 00fafdce2..44c16e7bc 100644 --- a/man/systemd.swap.xml +++ b/man/systemd.swap.xml @@ -171,14 +171,14 @@ - Discard= - - Enable discards, if the swap - backing device supports the discard or trim - operation. Can be one of none, - once, pages - or all. Defaults to - none. (See + Options= + + May contain an option + string for the swap device. This may + be used for controlling discard + options among other functionality, if + the swap backing device supports the + discard or trim operation. (See swapon8 for more information.) diff --git a/src/core/dbus-swap.c b/src/core/dbus-swap.c index c854716b4..1e7f66d05 100644 --- a/src/core/dbus-swap.c +++ b/src/core/dbus-swap.c @@ -55,7 +55,7 @@ static int property_get_priority( return sd_bus_message_append(reply, "i", p); } -static int property_get_discard( +static int property_get_options( sd_bus *bus, const char *path, const char *interface, @@ -65,17 +65,16 @@ static int property_get_discard( sd_bus_error *error) { Swap *s = SWAP(userdata); - const char *p; + const char *options = NULL; assert(bus); assert(reply); assert(s); if (s->from_fragment) - p = s->parameters_fragment.discard ?: "none"; - else - p = "none"; - return sd_bus_message_append(reply, "s", p); + options = s->parameters_fragment.options; + + return sd_bus_message_append(reply, "s", options); } static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_result, swap_result, SwapResult); @@ -84,7 +83,7 @@ const sd_bus_vtable bus_swap_vtable[] = { SD_BUS_VTABLE_START(0), SD_BUS_PROPERTY("What", "s", NULL, offsetof(Swap, what), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE), SD_BUS_PROPERTY("Priority", "i", property_get_priority, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE), - SD_BUS_PROPERTY("Discard", "s", property_get_discard, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE), + SD_BUS_PROPERTY("Options", "s", property_get_options, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE), SD_BUS_PROPERTY("TimeoutUSec", "t", bus_property_get_usec, offsetof(Swap, timeout_usec), SD_BUS_VTABLE_PROPERTY_CONST), SD_BUS_PROPERTY("ControlPID", "u", bus_property_get_pid, offsetof(Swap, control_pid), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE), SD_BUS_PROPERTY("Result", "s", property_get_result, offsetof(Swap, result), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE), diff --git a/src/core/load-fragment-gperf.gperf.m4 b/src/core/load-fragment-gperf.gperf.m4 index 26d40fbc6..ca0139479 100644 --- a/src/core/load-fragment-gperf.gperf.m4 +++ b/src/core/load-fragment-gperf.gperf.m4 @@ -299,7 +299,7 @@ Automount.DirectoryMode, config_parse_mode, 0, m4_dnl Swap.What, config_parse_path, 0, offsetof(Swap, parameters_fragment.what) Swap.Priority, config_parse_int, 0, offsetof(Swap, parameters_fragment.priority) -Swap.Discard, config_parse_string, 0, offsetof(Swap, parameters_fragment.discard) +Swap.Options, config_parse_string, 0, offsetof(Swap, parameters_fragment.options) Swap.TimeoutSec, config_parse_sec, 0, offsetof(Swap, timeout_usec) EXEC_CONTEXT_CONFIG_ITEMS(Swap)m4_dnl CGROUP_CONTEXT_CONFIG_ITEMS(Swap)m4_dnl diff --git a/src/core/swap.c b/src/core/swap.c index b2ca048bc..1204386cd 100644 --- a/src/core/swap.c +++ b/src/core/swap.c @@ -152,8 +152,8 @@ static void swap_done(Unit *u) { free(s->parameters_fragment.what); s->parameters_fragment.what = NULL; - free(s->parameters_fragment.discard); - s->parameters_fragment.discard = NULL; + free(s->parameters_fragment.options); + s->parameters_fragment.options = NULL; s->exec_runtime = exec_runtime_unref(s->exec_runtime); exec_command_done_array(s->exec_command, _SWAP_EXEC_COMMAND_MAX); @@ -608,11 +608,11 @@ static void swap_dump(Unit *u, FILE *f, const char *prefix) { "%sPriority: %i\n" "%sNoAuto: %s\n" "%sNoFail: %s\n" - "%sDiscard: %s\n", + "%sOptions: %s\n", prefix, p->priority, prefix, yes_no(p->noauto), prefix, yes_no(p->nofail), - prefix, p->discard ?: "none"); + prefix, strempty(p->options)); if (s->control_pid > 0) fprintf(f, @@ -739,9 +739,74 @@ fail: swap_enter_dead(s, SWAP_FAILURE_RESOURCES); } +static int mount_find_pri(const char *options, int *ret) { + const char *opt; + char *end; + unsigned long r; + + assert(ret); + + if (!options) + return 0; + + opt = mount_test_option(options, "pri"); + if (!opt) + return 0; + + opt += strlen("pri"); + if (*opt != '=') + return -EINVAL; + + errno = 0; + r = strtoul(opt + 1, &end, 10); + if (errno > 0) + return -errno; + + if (end == opt + 1 || (*end != ',' && *end != 0)) + return -EINVAL; + + *ret = (int) r; + return 1; +} + +static int mount_find_discard(const char *options, char **ret) { + const char *opt; + char *ans; + size_t len; + + assert(ret); + + if (!options) + return 0; + + opt = mount_test_option(options, "discard"); + if (!opt) + return 0; + + opt += strlen("discard"); + if (*opt == ',' || *opt == '\0') + ans = strdup("all"); + else { + if (*opt != '=') + return -EINVAL; + + len = strcspn(opt + 1, ","); + if (len == 0) + return -EINVAL; + + ans = strndup(opt + 1, len); + } + + if (!ans) + return -ENOMEM; + + *ret = ans; + return 1; +} + static void swap_enter_activating(Swap *s) { - int r, priority; - char *discard; + _cleanup_free_ char *discard = NULL; + int r, priority = -1; assert(s); @@ -749,11 +814,11 @@ static void swap_enter_activating(Swap *s) { s->control_command = s->exec_command + SWAP_EXEC_ACTIVATE; if (s->from_fragment) { + mount_find_discard(s->parameters_fragment.options, &discard); + priority = s->parameters_fragment.priority; - discard = s->parameters_fragment.discard; - } else { - priority = -1; - discard = NULL; + if (priority < 0) + mount_find_pri(s->parameters_fragment.options, &priority); } r = exec_command_set(s->control_command, "/sbin/swapon", NULL); @@ -770,9 +835,11 @@ static void swap_enter_activating(Swap *s) { } if (discard && !streq(discard, "none")) { - const char *discard_arg = "--discard"; + const char *discard_arg; - if (!streq(discard, "all")) + if (streq(discard, "all")) + discard_arg = "--discard"; + else discard_arg = strappenda("--discard=", discard); r = exec_command_append(s->control_command, discard_arg, NULL); diff --git a/src/core/swap.h b/src/core/swap.h index 3482d651e..053c8492b 100644 --- a/src/core/swap.h +++ b/src/core/swap.h @@ -63,7 +63,7 @@ typedef enum SwapResult { typedef struct SwapParameters { char *what; - char *discard; + char *options; int priority; bool noauto:1; bool nofail:1; diff --git a/src/fstab-generator/fstab-generator.c b/src/fstab-generator/fstab-generator.c index 32a8f9bd5..e257c121e 100644 --- a/src/fstab-generator/fstab-generator.c +++ b/src/fstab-generator/fstab-generator.c @@ -47,7 +47,6 @@ static char *arg_usr_what = NULL; static char *arg_usr_fstype = NULL; static char *arg_usr_options = NULL; - static int mount_find_pri(struct mntent *me, int *ret) { char *end, *opt; unsigned long r; @@ -60,7 +59,6 @@ static int mount_find_pri(struct mntent *me, int *ret) { return 0; opt += strlen("pri"); - if (*opt != '=') return -EINVAL; @@ -76,43 +74,9 @@ static int mount_find_pri(struct mntent *me, int *ret) { return 1; } -static int mount_find_discard(struct mntent *me, char **ret) { - char *opt, *ans; - size_t len; - - assert(me); - assert(ret); - - opt = hasmntopt(me, "discard"); - if (!opt) - return 0; - - opt += strlen("discard"); - - if (*opt == ',' || *opt == '\0') - ans = strdup("all"); - else { - if (*opt != '=') - return -EINVAL; - - len = strcspn(opt + 1, ","); - if (len == 0) - return -EINVAL; - - ans = strndup(opt + 1, len); - } - - if (!ans) - return -ENOMEM; - - *ret = ans; - return 1; -} - static int add_swap(const char *what, struct mntent *me) { _cleanup_free_ char *name = NULL, *unit = NULL, *lnk = NULL; _cleanup_fclose_ FILE *f = NULL; - _cleanup_free_ char *discard = NULL; bool noauto; int r, pri = -1; @@ -131,12 +95,6 @@ static int add_swap(const char *what, struct mntent *me) { return r; } - r = mount_find_discard(me, &discard); - if (r < 0) { - log_error("Failed to parse discard"); - return r; - } - noauto = !!hasmntopt(me, "noauto"); name = unit_name_from_path(what, ".swap"); @@ -165,16 +123,18 @@ static int add_swap(const char *what, struct mntent *me) { "What=%s\n", what); + /* Note that we currently pass the priority field twice, once + * in Priority=, and once in Options= */ if (pri >= 0) fprintf(f, "Priority=%i\n", pri); - if (discard) - fprintf(f, "Discard=%s\n", discard); + if (!isempty(me->mnt_opts) && !streq(me->mnt_opts, "defaults")) + fprintf(f, "Options=%s\n", me->mnt_opts); - fflush(f); - if (ferror(f)) { - log_error("Failed to write unit file %s: %m", unit); - return -errno; + r = fflush_and_check(f); + if (r < 0) { + log_error("Failed to write unit file %s: %s", unit, strerror(-r)); + return r; } /* use what as where, to have a nicer error message */ -- 2.30.2