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base/SOURCES/0106-zramctl-backport-from-...

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util linux patches Signed-off-by: basebuilder_pel7ppc64bebuilder0 <basebuilder@powerel.org>
7 years ago
From c43588bf03cc05b2eae724751b6652949e5c9caa Mon Sep 17 00:00:00 2001
From: Karel Zak <kzak@redhat.com>
Date: Tue, 21 Mar 2017 13:04:17 +0100
Subject: [PATCH 106/116] zramctl: backport from v2.29
Addresses: https://bugzilla.redhat.com/show_bug.cgi?id=1358755
Signed-off-by: Karel Zak <kzak@redhat.com>
---
.gitignore | 1 +
configure.ac | 6 +
include/Makemodule.am | 1 +
include/c.h | 8 +
include/strutils.h | 9 +
include/strv.h | 55 ++++
include/sysfs.h | 3 +
lib/Makemodule.am | 3 +-
lib/strutils.c | 129 +++++++++
lib/strv.c | 403 ++++++++++++++++++++++++++
lib/sysfs.c | 45 ++-
sys-utils/Makemodule.am | 7 +
sys-utils/zramctl.8 | 123 ++++++++
sys-utils/zramctl.c | 736 ++++++++++++++++++++++++++++++++++++++++++++++++
14 files changed, 1524 insertions(+), 5 deletions(-)
create mode 100644 include/strv.h
create mode 100644 lib/strv.c
create mode 100644 sys-utils/zramctl.8
create mode 100644 sys-utils/zramctl.c
diff --git a/configure.ac b/configure.ac
index f87a885..db7095a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -826,6 +826,12 @@ UL_REQUIRES_LINUX([losetup])
AM_CONDITIONAL(BUILD_LOSETUP, test "x$build_losetup" = xyes)
+UL_BUILD_INIT([zramctl], [check])
+UL_REQUIRES_LINUX([zramctl])
+UL_REQUIRES_BUILD([zramctl], [libsmartcols])
+AM_CONDITIONAL([BUILD_ZRAMCTL], [test "x$build_zramctl" = xyes])
+
+
AC_ARG_ENABLE([cytune],
AS_HELP_STRING([--disable-cytune], [do not build cytune]),
[], enable_cytune=check
diff --git a/include/Makemodule.am b/include/Makemodule.am
index 757f317..1680296 100644
--- a/include/Makemodule.am
+++ b/include/Makemodule.am
@@ -39,6 +39,7 @@ dist_noinst_HEADERS += \
include/readutmp.h \
include/setproctitle.h \
include/strutils.h \
+ include/strv.h \
include/swapheader.h \
include/sysfs.h \
include/timer.h \
diff --git a/include/c.h b/include/c.h
index a2779a5..3754e75 100644
--- a/include/c.h
+++ b/include/c.h
@@ -309,6 +309,14 @@ static inline int usleep(useconds_t usec)
#endif
/*
+ * Macros to convert #define'itions to strings, for example
+ * #define XYXXY 42
+ * printf ("%s=%s\n", stringify(XYXXY), stringify_value(XYXXY));
+ */
+#define stringify_value(s) stringify(s)
+#define stringify(s) #s
+
+/*
* Note that sysconf(_SC_GETPW_R_SIZE_MAX) returns *initial* suggested size for
* pwd buffer and in some cases it is not large enough. See POSIX and
* getpwnam_r man page for more details.
diff --git a/include/strutils.h b/include/strutils.h
index 709fcad..aa7b95f 100644
--- a/include/strutils.h
+++ b/include/strutils.h
@@ -5,6 +5,7 @@
#include <inttypes.h>
#include <string.h>
#include <sys/types.h>
+#include <stdio.h>
/* default strtoxx_or_err() exit code */
#ifndef STRTOXX_EXIT_CODE
@@ -102,4 +103,12 @@ extern int parse_range(const char *str, int *lower, int *upper, int def);
extern int streq_except_trailing_slash(const char *s1, const char *s2);
+extern char *strnappend(const char *s, const char *suffix, size_t b);
+extern char *strappend(const char *s, const char *suffix);
+extern char *strfappend(const char *s, const char *format, ...)
+ __attribute__ ((__format__ (__printf__, 2, 0)));
+extern const char *split(const char **state, size_t *l, const char *separator, int quoted);
+
+extern int skip_fline(FILE *fp);
+
#endif
diff --git a/include/strv.h b/include/strv.h
new file mode 100644
index 0000000..260ad12
--- /dev/null
+++ b/include/strv.h
@@ -0,0 +1,55 @@
+#ifndef UTIL_LINUX_STRV
+#define UTIL_LINUX_STRV
+
+#include <stdarg.h>
+
+#include "c.h"
+
+char **strv_free(char **l);
+void strv_clear(char **l);
+char **strv_copy(char * const *l);
+unsigned strv_length(char * const *l);
+
+int strv_extend_strv(char ***a, char **b);
+int strv_extend_strv_concat(char ***a, char **b, const char *suffix);
+int strv_extend(char ***l, const char *value);
+int strv_extendv(char ***l, const char *format, va_list ap);
+int strv_extendf(char ***l, const char *format, ...)
+ __attribute__ ((__format__ (__printf__, 2, 0)));
+int strv_push(char ***l, char *value);
+int strv_push_prepend(char ***l, char *value);
+int strv_consume(char ***l, char *value);
+int strv_consume_prepend(char ***l, char *value);
+
+char **strv_remove(char **l, const char *s);
+
+char **strv_new(const char *x, ...);
+char **strv_new_ap(const char *x, va_list ap);
+
+static inline const char* STRV_IFNOTNULL(const char *x) {
+ return x ? x : (const char *) -1;
+}
+
+static inline int strv_isempty(char * const *l) {
+ return !l || !*l;
+}
+
+char **strv_split(const char *s, const char *separator);
+char *strv_join(char **l, const char *separator);
+
+#define STRV_FOREACH(s, l) \
+ for ((s) = (l); (s) && *(s); (s)++)
+
+#define STRV_FOREACH_BACKWARDS(s, l) \
+ STRV_FOREACH(s, l) \
+ ; \
+ for ((s)--; (l) && ((s) >= (l)); (s)--)
+
+
+#define STRV_MAKE_EMPTY ((char*[1]) { NULL })
+
+char **strv_reverse(char **l);
+
+#endif /* UTIL_LINUX_STRV */
+
+
diff --git a/include/sysfs.h b/include/sysfs.h
index 0a9c218..a547005 100644
--- a/include/sysfs.h
+++ b/include/sysfs.h
@@ -58,6 +58,9 @@ extern int sysfs_read_s64(struct sysfs_cxt *cxt, const char *attr, int64_t *res)
extern int sysfs_read_u64(struct sysfs_cxt *cxt, const char *attr, uint64_t *res);
extern int sysfs_read_int(struct sysfs_cxt *cxt, const char *attr, int *res);
+extern int sysfs_write_string(struct sysfs_cxt *cxt, const char *attr, const char *str);
+extern int sysfs_write_u64(struct sysfs_cxt *cxt, const char *attr, uint64_t num);
+
extern char *sysfs_get_devname(struct sysfs_cxt *cxt, char *buf, size_t bufsiz);
extern char *sysfs_strdup(struct sysfs_cxt *cxt, const char *attr);
diff --git a/lib/Makemodule.am b/lib/Makemodule.am
index 73280f9..faf9d74 100644
--- a/lib/Makemodule.am
+++ b/lib/Makemodule.am
@@ -27,7 +27,8 @@ libcommon_la_SOURCES = \
lib/ttyutils.c \
lib/xgetpass.c \
lib/exec_shell.c \
- lib/readutmp.c
+ lib/readutmp.c \
+ lib/strv.c
if LINUX
libcommon_la_SOURCES += \
diff --git a/lib/strutils.c b/lib/strutils.c
index f9cdcbb..4b8a813 100644
--- a/lib/strutils.c
+++ b/lib/strutils.c
@@ -10,6 +10,7 @@
#include <errno.h>
#include <sys/stat.h>
#include <string.h>
+#include <assert.h>
#include "c.h"
#include "nls.h"
@@ -687,6 +688,134 @@ int streq_except_trailing_slash(const char *s1, const char *s2)
return equal;
}
+char *strnappend(const char *s, const char *suffix, size_t b)
+{
+ size_t a;
+ char *r;
+
+ if (!s && !suffix)
+ return strdup("");
+ if (!s)
+ return strndup(suffix, b);
+ if (!suffix)
+ return strdup(s);
+
+ assert(s);
+ assert(suffix);
+
+ a = strlen(s);
+ if (b > ((size_t) -1) - a)
+ return NULL;
+
+ r = malloc(a + b + 1);
+ if (!r)
+ return NULL;
+
+ memcpy(r, s, a);
+ memcpy(r + a, suffix, b);
+ r[a+b] = 0;
+
+ return r;
+}
+
+char *strappend(const char *s, const char *suffix)
+{
+ return strnappend(s, suffix, suffix ? strlen(suffix) : 0);
+}
+
+char *strfappend(const char *s, const char *format, ...)
+{
+ va_list ap;
+ char *val, *res;
+ int sz;
+
+ va_start(ap, format);
+ sz = vasprintf(&val, format, ap);
+ va_end(ap);
+
+ if (sz < 0)
+ return NULL;
+
+ res = strnappend(s, val, sz);
+ free(val);
+ return res;
+}
+
+static size_t strcspn_escaped(const char *s, const char *reject)
+{
+ int escaped = 0;
+ int n;
+
+ for (n=0; s[n]; n++) {
+ if (escaped)
+ escaped = 0;
+ else if (s[n] == '\\')
+ escaped = 1;
+ else if (strchr(reject, s[n]))
+ break;
+ }
+
+ /* if s ends in \, return index of previous char */
+ return n - escaped;
+}
+
+/* Split a string into words. */
+const char *split(const char **state, size_t *l, const char *separator, int quoted)
+{
+ const char *current;
+
+ current = *state;
+
+ if (!*current) {
+ assert(**state == '\0');
+ return NULL;
+ }
+
+ current += strspn(current, separator);
+ if (!*current) {
+ *state = current;
+ return NULL;
+ }
+
+ if (quoted && strchr("\'\"", *current)) {
+ char quotechars[2] = {*current, '\0'};
+
+ *l = strcspn_escaped(current + 1, quotechars);
+ if (current[*l + 1] == '\0' || current[*l + 1] != quotechars[0] ||
+ (current[*l + 2] && !strchr(separator, current[*l + 2]))) {
+ /* right quote missing or garbage at the end */
+ *state = current;
+ return NULL;
+ }
+ *state = current++ + *l + 2;
+ } else if (quoted) {
+ *l = strcspn_escaped(current, separator);
+ if (current[*l] && !strchr(separator, current[*l])) {
+ /* unfinished escape */
+ *state = current;
+ return NULL;
+ }
+ *state = current + *l;
+ } else {
+ *l = strcspn(current, separator);
+ *state = current + *l;
+ }
+
+ return current;
+}
+
+/* Rewind file pointer forward to new line. */
+int skip_fline(FILE *fp)
+{
+ int ch;
+
+ do {
+ if ((ch = fgetc(fp)) == EOF)
+ return 1;
+ if (ch == '\n')
+ return 0;
+ } while (1);
+}
#ifdef TEST_PROGRAM
diff --git a/lib/strv.c b/lib/strv.c
new file mode 100644
index 0000000..ddc2a0c
--- /dev/null
+++ b/lib/strv.c
@@ -0,0 +1,403 @@
+/*
+ *
+ * Copyright 2010 Lennart Poettering
+ *
+ * This 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.
+ *
+ *
+ * Copyright (C) 2015 Karel Zak <kzak@redhat.com>
+ * Modified the original version from systemd project for util-linux.
+ */
+
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+#include <errno.h>
+#include <stdbool.h>
+#include <assert.h>
+
+#include "strutils.h"
+#include "strv.h"
+
+void strv_clear(char **l) {
+ char **k;
+
+ if (!l)
+ return;
+
+ for (k = l; *k; k++)
+ free(*k);
+
+ *l = NULL;
+}
+
+char **strv_free(char **l) {
+ strv_clear(l);
+ free(l);
+ return NULL;
+}
+
+char **strv_copy(char * const *l) {
+ char **r, **k;
+
+ k = r = malloc(sizeof(char *) * (strv_length(l) + 1));
+ if (!r)
+ return NULL;
+
+ if (l)
+ for (; *l; k++, l++) {
+ *k = strdup(*l);
+ if (!*k) {
+ strv_free(r);
+ return NULL;
+ }
+ }
+
+ *k = NULL;
+ return r;
+}
+
+unsigned strv_length(char * const *l) {
+ unsigned n = 0;
+
+ if (!l)
+ return 0;
+
+ for (; *l; l++)
+ n++;
+
+ return n;
+}
+
+char **strv_new_ap(const char *x, va_list ap) {
+ const char *s;
+ char **a;
+ unsigned n = 0, i = 0;
+ va_list aq;
+
+ /* As a special trick we ignore all listed strings that equal
+ * (const char*) -1. This is supposed to be used with the
+ * STRV_IFNOTNULL() macro to include possibly NULL strings in
+ * the string list. */
+
+ if (x) {
+ n = x == (const char*) -1 ? 0 : 1;
+
+ va_copy(aq, ap);
+ while ((s = va_arg(aq, const char*))) {
+ if (s == (const char*) -1)
+ continue;
+
+ n++;
+ }
+
+ va_end(aq);
+ }
+
+ a = malloc(sizeof(char *) * (n + 1));
+ if (!a)
+ return NULL;
+
+ if (x) {
+ if (x != (const char*) -1) {
+ a[i] = strdup(x);
+ if (!a[i])
+ goto fail;
+ i++;
+ }
+
+ while ((s = va_arg(ap, const char*))) {
+
+ if (s == (const char*) -1)
+ continue;
+
+ a[i] = strdup(s);
+ if (!a[i])
+ goto fail;
+
+ i++;
+ }
+ }
+
+ a[i] = NULL;
+
+ return a;
+
+fail:
+ strv_free(a);
+ return NULL;
+}
+
+char **strv_new(const char *x, ...) {
+ char **r;
+ va_list ap;
+
+ va_start(ap, x);
+ r = strv_new_ap(x, ap);
+ va_end(ap);
+
+ return r;
+}
+
+int strv_extend_strv(char ***a, char **b) {
+ int r;
+ char **s;
+
+ STRV_FOREACH(s, b) {
+ r = strv_extend(a, *s);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+
+int strv_extend_strv_concat(char ***a, char **b, const char *suffix) {
+ int r;
+ char **s;
+
+ STRV_FOREACH(s, b) {
+ char *v;
+
+ v = strappend(*s, suffix);
+ if (!v)
+ return -ENOMEM;
+
+ r = strv_push(a, v);
+ if (r < 0) {
+ free(v);
+ return r;
+ }
+ }
+
+ return 0;
+}
+
+
+#define _FOREACH_WORD(word, length, s, separator, quoted, state) \
+ for ((state) = (s), (word) = split(&(state), &(length), (separator), (quoted)); (word); (word) = split(&(state), &(length), (separator), (quoted)))
+
+#define FOREACH_WORD_SEPARATOR(word, length, s, separator, state) \
+ _FOREACH_WORD(word, length, s, separator, false, state)
+
+
+char **strv_split(const char *s, const char *separator) {
+ const char *word, *state;
+ size_t l;
+ unsigned n, i;
+ char **r;
+
+ assert(s);
+
+ n = 0;
+ FOREACH_WORD_SEPARATOR(word, l, s, separator, state)
+ n++;
+
+ r = malloc(sizeof(char *) * (n + 1));
+ if (!r)
+ return NULL;
+
+ i = 0;
+ FOREACH_WORD_SEPARATOR(word, l, s, separator, state) {
+ r[i] = strndup(word, l);
+ if (!r[i]) {
+ strv_free(r);
+ return NULL;
+ }
+
+ i++;
+ }
+
+ r[i] = NULL;
+ return r;
+}
+
+char *strv_join(char **l, const char *separator) {
+ char *r, *e;
+ char **s;
+ size_t n, k;
+
+ if (!separator)
+ separator = " ";
+
+ k = strlen(separator);
+
+ n = 0;
+ STRV_FOREACH(s, l) {
+ if (n != 0)
+ n += k;
+ n += strlen(*s);
+ }
+
+ r = malloc(n + 1);
+ if (!r)
+ return NULL;
+
+ e = r;
+ STRV_FOREACH(s, l) {
+ if (e != r)
+ e = stpcpy(e, separator);
+
+ e = stpcpy(e, *s);
+ }
+
+ *e = 0;
+
+ return r;
+}
+
+int strv_push(char ***l, char *value) {
+ char **c;
+ unsigned n, m;
+
+ if (!value)
+ return 0;
+
+ n = strv_length(*l);
+
+ /* Increase and check for overflow */
+ m = n + 2;
+ if (m < n)
+ return -ENOMEM;
+
+ c = realloc(*l, sizeof(char *) * m);
+ if (!c)
+ return -ENOMEM;
+
+ c[n] = value;
+ c[n+1] = NULL;
+
+ *l = c;
+ return 0;
+}
+
+int strv_push_prepend(char ***l, char *value) {
+ char **c;
+ unsigned n, m, i;
+
+ if (!value)
+ return 0;
+
+ n = strv_length(*l);
+
+ /* increase and check for overflow */
+ m = n + 2;
+ if (m < n)
+ return -ENOMEM;
+
+ c = malloc(sizeof(char *) * m);
+ if (!c)
+ return -ENOMEM;
+
+ for (i = 0; i < n; i++)
+ c[i+1] = (*l)[i];
+
+ c[0] = value;
+ c[n+1] = NULL;
+
+ free(*l);
+ *l = c;
+
+ return 0;
+}
+
+int strv_consume(char ***l, char *value) {
+ int r;
+
+ r = strv_push(l, value);
+ if (r < 0)
+ free(value);
+
+ return r;
+}
+
+int strv_consume_prepend(char ***l, char *value) {
+ int r;
+
+ r = strv_push_prepend(l, value);
+ if (r < 0)
+ free(value);
+
+ return r;
+}
+
+int strv_extend(char ***l, const char *value) {
+ char *v;
+
+ if (!value)
+ return 0;
+
+ v = strdup(value);
+ if (!v)
+ return -ENOMEM;
+
+ return strv_consume(l, v);
+}
+
+char **strv_remove(char **l, const char *s) {
+ char **f, **t;
+
+ if (!l)
+ return NULL;
+
+ assert(s);
+
+ /* Drops every occurrence of s in the string list, edits
+ * in-place. */
+
+ for (f = t = l; *f; f++)
+ if (strcmp(*f, s) == 0)
+ free(*f);
+ else
+ *(t++) = *f;
+
+ *t = NULL;
+ return l;
+}
+
+int strv_extendf(char ***l, const char *format, ...) {
+ va_list ap;
+ char *x;
+ int r;
+
+ va_start(ap, format);
+ r = vasprintf(&x, format, ap);
+ va_end(ap);
+
+ if (r < 0)
+ return -ENOMEM;
+
+ return strv_consume(l, x);
+}
+
+int strv_extendv(char ***l, const char *format, va_list ap) {
+ char *x;
+ int r;
+
+ r = vasprintf(&x, format, ap);
+ if (r < 0)
+ return -ENOMEM;
+
+ return strv_consume(l, x);
+}
+
+char **strv_reverse(char **l) {
+ unsigned n, i;
+
+ n = strv_length(l);
+ if (n <= 1)
+ return l;
+
+ for (i = 0; i < n / 2; i++) {
+ char *t;
+
+ t = l[i];
+ l[i] = l[n-1-i];
+ l[n-1-i] = t;
+ }
+
+ return l;
+}
diff --git a/lib/sysfs.c b/lib/sysfs.c
index 0bfd622..65a8394 100644
--- a/lib/sysfs.c
+++ b/lib/sysfs.c
@@ -10,6 +10,7 @@
#include "at.h"
#include "pathnames.h"
#include "sysfs.h"
+#include "all-io.h"
char *sysfs_devno_attribute_path(dev_t devno, char *buf,
size_t bufsiz, const char *attr)
@@ -203,9 +204,9 @@ int sysfs_has_attribute(struct sysfs_cxt *cxt, const char *attr)
return sysfs_stat(cxt, attr, &st) == 0;
}
-static int sysfs_open(struct sysfs_cxt *cxt, const char *attr)
+static int sysfs_open(struct sysfs_cxt *cxt, const char *attr, int flags)
{
- int fd = open_at(cxt->dir_fd, cxt->dir_path, attr, O_RDONLY|O_CLOEXEC);
+ int fd = open_at(cxt->dir_fd, cxt->dir_path, attr, flags);
if (fd == -1 && errno == ENOENT &&
strncmp(attr, "queue/", 6) == 0 && cxt->parent) {
@@ -238,7 +239,7 @@ DIR *sysfs_opendir(struct sysfs_cxt *cxt, const char *attr)
int fd = -1;
if (attr)
- fd = sysfs_open(cxt, attr);
+ fd = sysfs_open(cxt, attr, O_RDONLY|O_CLOEXEC);
else if (cxt->dir_fd >= 0)
/* request to open root of device in sysfs (/sys/block/<dev>)
@@ -263,7 +264,7 @@ DIR *sysfs_opendir(struct sysfs_cxt *cxt, const char *attr)
static FILE *sysfs_fopen(struct sysfs_cxt *cxt, const char *attr)
{
- int fd = sysfs_open(cxt, attr);
+ int fd = sysfs_open(cxt, attr, O_RDONLY|O_CLOEXEC);
return fd < 0 ? NULL : fdopen(fd, "r" UL_CLOEXECSTR);
}
@@ -417,6 +418,42 @@ int sysfs_read_int(struct sysfs_cxt *cxt, const char *attr, int *res)
return -1;
}
+int sysfs_write_string(struct sysfs_cxt *cxt, const char *attr, const char *str)
+{
+ int fd = sysfs_open(cxt, attr, O_WRONLY|O_CLOEXEC);
+ int rc, errsv;
+
+ if (fd < 0)
+ return -errno;
+ rc = write_all(fd, str, strlen(str));
+
+ errsv = errno;
+ close(fd);
+ errno = errsv;
+ return rc;
+}
+
+int sysfs_write_u64(struct sysfs_cxt *cxt, const char *attr, uint64_t num)
+{
+ char buf[sizeof(stringify_value(ULLONG_MAX))];
+ int fd, rc = 0, len, errsv;
+
+ fd = sysfs_open(cxt, attr, O_WRONLY|O_CLOEXEC);
+ if (fd < 0)
+ return -errno;
+
+ len = snprintf(buf, sizeof(buf), "%" PRIu64, num);
+ if (len < 0 || (size_t) len >= sizeof(buf))
+ rc = len < 0 ? -errno : -E2BIG;
+ else
+ rc = write_all(fd, buf, len);
+
+ errsv = errno;
+ close(fd);
+ errno = errsv;
+ return rc;
+}
+
char *sysfs_strdup(struct sysfs_cxt *cxt, const char *attr)
{
char buf[1024];
diff --git a/sys-utils/Makemodule.am b/sys-utils/Makemodule.am
index 6badd17..408e884 100644
--- a/sys-utils/Makemodule.am
+++ b/sys-utils/Makemodule.am
@@ -184,6 +184,13 @@ losetup_static_LDADD = $(losetup_LDADD)
endif
endif # BUILD_LOSETUP
+if BUILD_ZRAMCTL
+sbin_PROGRAMS += zramctl
+dist_man_MANS += sys-utils/zramctl.8
+zramctl_SOURCES = sys-utils/zramctl.c
+zramctl_LDADD = $(LDADD) libcommon.la libsmartcols.la
+zramctl_CFLAGS = $(AM_CFLAGS) -I$(ul_libsmartcols_incdir)
+endif
if BUILD_PRLIMIT
usrbin_exec_PROGRAMS += prlimit
diff --git a/sys-utils/zramctl.8 b/sys-utils/zramctl.8
new file mode 100644
index 0000000..f6fc45c
--- /dev/null
+++ b/sys-utils/zramctl.8
@@ -0,0 +1,123 @@
+.TH ZRAMCTL 8 "July 2014" "util-linux" "System Administration"
+.SH NAME
+zramctl \- set up and control zram devices
+.SH SYNOPSIS
+.ad l
+Get info:
+.sp
+.in +5
+.BR zramctl " [options]"
+.sp
+.in -5
+Reset zram:
+.sp
+.in +5
+.B "zramctl \-r"
+.IR zramdev ...
+.sp
+.in -5
+Print name of first unused zram device:
+.sp
+.in +5
+.B "zramctl \-f"
+.sp
+.in -5
+Set up a zram device:
+.sp
+.in +5
+.B zramctl
+.RB [ \-f " | "\fIzramdev\fP ]
+.RB [ \-s
+.IR size ]
+.RB [ \-t
+.IR number ]
+.RB [ \-a
+.IR algorithm ]
+.sp
+.in -5
+.ad b
+.SH DESCRIPTION
+.B zramctl
+is used to quickly set up zram device parameters, to reset zram devices, and to
+query the status of used zram devices. If no option is given, all zram devices
+are shown.
+
+.SH OPTIONS
+.TP
+.BR \-a , " \-\-algorithm lzo" | lz4
+Set the compression algorithm to be used for compressing data in the zram device.
+.TP
+.BR \-f , " \-\-find"
+Find the first unused zram device. If a \fB--size\fR argument is present, then
+initialize the device.
+.TP
+.BR \-n , " \-\-noheadings"
+Do not print a header line in status output.
+.TP
+.BR \-o , " \-\-output " \fIlist
+Define the status output columns to be used. If no output arrangement is
+specified, then a default set is used.
+Use \fB\-\-help\fP to get a list of all supported columns.
+.TP
+.B \-\-raw
+Use the raw format for status output.
+.TP
+.BR \-r , " \-\-reset"
+Reset the options of the specified zram device(s). Zram device settings
+can be changed only after a reset.
+.TP
+.BR \-s , " \-\-size " \fIsize
+Create a zram device of the specified \fIsize\fR.
+Zram devices are aligned to memory pages; when the requested \fIsize\fR is
+not a multiple of the page size, it will be rounded up to the next multiple.
+When not otherwise specified, the unit of the \fIsize\fR parameter is bytes.
+.IP
+The \fIsize\fR argument may be followed by the multiplicative suffixes KiB (=1024),
+MiB (=1024*1024), and so on for GiB, TiB, PiB, EiB, ZiB and YiB (the "iB"
+is optional, e.g., "K" has the same meaning as "KiB") or the suffixes
+KB (=1000), MB (=1000*1000), and so on for GB, TB, PB, EB, ZB and YB.
+.TP
+.BR \-t , " \-\-streams " \fInumber
+Set the maximum number of compression streams that can be used for the device.
+The default is one stream.
+.TP
+.BR \-V , " \-\-version"
+Display version information and exit.
+.TP
+.BR \-h , " \-\-help"
+Display help text and exit.
+
+.SH RETURN VALUE
+.B zramctl
+returns 0 on success, nonzero on failure.
+
+.SH FILES
+.TP
+.I /dev/zram[0..N]
+zram block devices
+
+.SH EXAMPLE
+The following commands set up a zram device with a size of one gigabyte
+and use it as swap device.
+.nf
+.IP
+# zramctl --find --size 1024M
+/dev/zram0
+# mkswap /dev/zram0
+# swapon /dev/zram0
+ ...
+# swapoff /dev/zram0
+# zramctl --reset /dev/zram0
+.fi
+.SH SEE ALSO
+.UR http://git.\:kernel.\:org\:/cgit\:/linux\:/kernel\:/git\:/torvalds\:/linux.git\:/tree\:/Documentation\:/blockdev\:/zram.txt
+Linux kernel documentation
+.UE .
+.SH AUTHORS
+.nf
+Timofey Titovets <nefelim4ag@gmail.com>
+Karel Zak <kzak@redhat.com>
+.fi
+.SH AVAILABILITY
+The zramctl command is part of the util-linux package and is available from
+https://www.kernel.org/pub/linux/utils/util-linux/.
diff --git a/sys-utils/zramctl.c b/sys-utils/zramctl.c
new file mode 100644
index 0000000..853401c
--- /dev/null
+++ b/sys-utils/zramctl.c
@@ -0,0 +1,736 @@
+/*
+ * zramctl - control compressed block devices in RAM
+ *
+ * Copyright (c) 2014 Timofey Titovets <Nefelim4ag@gmail.com>
+ * Copyright (C) 2014 Karel Zak <kzak@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <getopt.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+#include <assert.h>
+
+#include <libsmartcols.h>
+
+#include "c.h"
+#include "nls.h"
+#include "closestream.h"
+#include "strutils.h"
+#include "xalloc.h"
+#include "sysfs.h"
+#include "optutils.h"
+#include "ismounted.h"
+#include "strv.h"
+#include "path.h"
+#include "pathnames.h"
+
+/*#define CONFIG_ZRAM_DEBUG*/
+
+#ifdef CONFIG_ZRAM_DEBUG
+# define DBG(x) do { fputs("zram: ", stderr); x; fputc('\n', stderr); } while(0)
+#else
+# define DBG(x)
+#endif
+
+/* status output columns */
+struct colinfo {
+ const char *name;
+ double whint;
+ int flags;
+ const char *help;
+};
+
+enum {
+ COL_NAME = 0,
+ COL_DISKSIZE,
+ COL_ORIG_SIZE,
+ COL_COMP_SIZE,
+ COL_ALGORITHM,
+ COL_STREAMS,
+ COL_ZEROPAGES,
+ COL_MEMTOTAL,
+ COL_MEMLIMIT,
+ COL_MEMUSED,
+ COL_MIGRATED,
+ COL_MOUNTPOINT
+};
+
+static const struct colinfo infos[] = {
+ [COL_NAME] = { "NAME", 0.25, 0, N_("zram device name") },
+ [COL_DISKSIZE] = { "DISKSIZE", 5, SCOLS_FL_RIGHT, N_("limit on the uncompressed amount of data") },
+ [COL_ORIG_SIZE] = { "DATA", 5, SCOLS_FL_RIGHT, N_("uncompressed size of stored data") },
+ [COL_COMP_SIZE] = { "COMPR", 5, SCOLS_FL_RIGHT, N_("compressed size of stored data") },
+ [COL_ALGORITHM] = { "ALGORITHM", 3, 0, N_("the selected compression algorithm") },
+ [COL_STREAMS] = { "STREAMS", 3, SCOLS_FL_RIGHT, N_("number of concurrent compress operations") },
+ [COL_ZEROPAGES] = { "ZERO-PAGES", 3, SCOLS_FL_RIGHT, N_("empty pages with no allocated memory") },
+ [COL_MEMTOTAL] = { "TOTAL", 5, SCOLS_FL_RIGHT, N_("all memory including allocator fragmentation and metadata overhead") },
+ [COL_MEMLIMIT] = { "MEM-LIMIT", 5, SCOLS_FL_RIGHT, N_("memory limit used to store compressed data") },
+ [COL_MEMUSED] = { "MEM-USED", 5, SCOLS_FL_RIGHT, N_("memory zram have been consumed to store compressed data") },
+ [COL_MIGRATED] = { "MIGRATED", 5, SCOLS_FL_RIGHT, N_("number of objects migrated by compaction") },
+ [COL_MOUNTPOINT]= { "MOUNTPOINT",0.10, SCOLS_FL_TRUNC, N_("where the device is mounted") },
+};
+
+static int columns[ARRAY_SIZE(infos) * 2] = {-1};
+static int ncolumns;
+
+enum {
+ MM_ORIG_DATA_SIZE = 0,
+ MM_COMPR_DATA_SIZE,
+ MM_MEM_USED_TOTAL,
+ MM_MEM_LIMIT,
+ MM_MEM_USED_MAX,
+ MM_ZERO_PAGES,
+ MM_NUM_MIGRATED
+};
+
+static const char *mm_stat_names[] = {
+ [MM_ORIG_DATA_SIZE] = "orig_data_size",
+ [MM_COMPR_DATA_SIZE] = "compr_data_size",
+ [MM_MEM_USED_TOTAL] = "mem_used_total",
+ [MM_MEM_LIMIT] = "mem_limit",
+ [MM_MEM_USED_MAX] = "mem_used_max",
+ [MM_ZERO_PAGES] = "zero_pages",
+ [MM_NUM_MIGRATED] = "num_migrated"
+};
+
+
+struct zram {
+ char devname[32];
+ struct sysfs_cxt sysfs;
+ char **mm_stat;
+
+ unsigned int mm_stat_probed : 1,
+ control_probed : 1,
+ has_control : 1; /* has /sys/class/zram-control/ */
+};
+
+#define ZRAM_EMPTY { .devname = { '\0' }, .sysfs = UL_SYSFSCXT_EMPTY }
+
+static unsigned int raw, no_headings, inbytes;
+
+
+static int get_column_id(int num)
+{
+ assert(num < ncolumns);
+ assert(columns[num] < (int) ARRAY_SIZE(infos));
+ return columns[num];
+}
+
+static const struct colinfo *get_column_info(int num)
+{
+ return &infos[ get_column_id(num) ];
+}
+
+static int column_name_to_id(const char *name, size_t namesz)
+{
+ size_t i;
+
+ for (i = 0; i < ARRAY_SIZE(infos); i++) {
+ const char *cn = infos[i].name;
+
+ if (!strncasecmp(name, cn, namesz) && !*(cn + namesz))
+ return i;
+ }
+ warnx(_("unknown column: %s"), name);
+ return -1;
+}
+
+static void zram_reset_stat(struct zram *z)
+{
+ if (z) {
+ strv_free(z->mm_stat);
+ z->mm_stat = NULL;
+ z->mm_stat_probed = 0;
+ }
+}
+
+static void zram_set_devname(struct zram *z, const char *devname, size_t n)
+{
+ assert(z);
+
+ if (!devname)
+ snprintf(z->devname, sizeof(z->devname), "/dev/zram%zu", n);
+ else {
+ strncpy(z->devname, devname, sizeof(z->devname));
+ z->devname[sizeof(z->devname) - 1] = '\0';
+ }
+
+ DBG(fprintf(stderr, "set devname: %s", z->devname));
+ sysfs_deinit(&z->sysfs);
+ zram_reset_stat(z);
+}
+
+static int zram_get_devnum(struct zram *z)
+{
+ int n;
+
+ assert(z);
+
+ if (sscanf(z->devname, "/dev/zram%d", &n) == 1)
+ return n;
+ return -EINVAL;
+}
+
+static struct zram *new_zram(const char *devname)
+{
+ struct zram *z = xcalloc(1, sizeof(struct zram));
+
+ DBG(fprintf(stderr, "new: %p", z));
+ if (devname)
+ zram_set_devname(z, devname, 0);
+ return z;
+}
+
+static void free_zram(struct zram *z)
+{
+ if (!z)
+ return;
+ DBG(fprintf(stderr, "free: %p", z));
+ sysfs_deinit(&z->sysfs);
+ zram_reset_stat(z);
+ free(z);
+}
+
+static struct sysfs_cxt *zram_get_sysfs(struct zram *z)
+{
+ assert(z);
+
+ if (!z->sysfs.devno) {
+ dev_t devno = sysfs_devname_to_devno(z->devname, NULL);
+ if (!devno)
+ return NULL;
+ if (sysfs_init(&z->sysfs, devno, NULL))
+ return NULL;
+ if (*z->devname != '/') {
+ /* canonicalize the device name according to /sys */
+ char name[PATH_MAX];
+ if (sysfs_get_devname(&z->sysfs, name, sizeof(name)))
+ snprintf(z->devname, sizeof(z->devname), "/dev/%s", name);
+ }
+ }
+
+ return &z->sysfs;
+}
+
+static inline int zram_exist(struct zram *z)
+{
+ assert(z);
+
+ errno = 0;
+ if (zram_get_sysfs(z) == NULL) {
+ errno = ENODEV;
+ return 0;
+ }
+
+ DBG(fprintf(stderr, "%s exists", z->devname));
+ return 1;
+}
+
+static int zram_set_u64parm(struct zram *z, const char *attr, uint64_t num)
+{
+ struct sysfs_cxt *sysfs = zram_get_sysfs(z);
+ if (!sysfs)
+ return -EINVAL;
+ DBG(fprintf(stderr, "%s writing %ju to %s", z->devname, num, attr));
+ return sysfs_write_u64(sysfs, attr, num);
+}
+
+static int zram_set_strparm(struct zram *z, const char *attr, const char *str)
+{
+ struct sysfs_cxt *sysfs = zram_get_sysfs(z);
+ if (!sysfs)
+ return -EINVAL;
+ DBG(fprintf(stderr, "%s writing %s to %s", z->devname, str, attr));
+ return sysfs_write_string(sysfs, attr, str);
+}
+
+
+static int zram_used(struct zram *z)
+{
+ uint64_t size;
+ struct sysfs_cxt *sysfs = zram_get_sysfs(z);
+
+ if (sysfs &&
+ sysfs_read_u64(sysfs, "disksize", &size) == 0 &&
+ size > 0) {
+
+ DBG(fprintf(stderr, "%s used", z->devname));
+ return 1;
+ }
+ DBG(fprintf(stderr, "%s unused", z->devname));
+ return 0;
+}
+
+static int zram_has_control(struct zram *z)
+{
+ if (!z->control_probed) {
+ z->has_control = access(_PATH_SYS_CLASS "/zram-control/", F_OK) == 0 ? 1 : 0;
+ z->control_probed = 1;
+ DBG(fprintf(stderr, "zram-control: %s", z->has_control ? "yes" : "no"));
+ }
+
+ return z->has_control;
+}
+
+static int zram_control_add(struct zram *z)
+{
+ int n;
+
+ if (!zram_has_control(z))
+ return -ENOSYS;
+
+ n = path_read_s32(_PATH_SYS_CLASS "/zram-control/hot_add");
+ if (n < 0)
+ return n;
+
+ DBG(fprintf(stderr, "hot-add: %d", n));
+ zram_set_devname(z, NULL, n);
+ return 0;
+}
+
+static int zram_control_remove(struct zram *z)
+{
+ char str[sizeof stringify_value(INT_MAX)];
+ int n;
+
+ if (!zram_has_control(z))
+ return -ENOSYS;
+
+ n = zram_get_devnum(z);
+ if (n < 0)
+ return n;
+
+ DBG(fprintf(stderr, "hot-remove: %d", n));
+ snprintf(str, sizeof(str), "%d", n);
+ return path_write_str(str, _PATH_SYS_CLASS "/zram-control/hot_remove");
+}
+
+static struct zram *find_free_zram(void)
+{
+ struct zram *z = new_zram(NULL);
+ size_t i;
+ int isfree = 0;
+
+ for (i = 0; isfree == 0; i++) {
+ DBG(fprintf(stderr, "find free: checking zram%zu", i));
+ zram_set_devname(z, NULL, i);
+ if (!zram_exist(z) && zram_control_add(z) != 0)
+ break;
+ isfree = !zram_used(z);
+ }
+ if (!isfree) {
+ free_zram(z);
+ z = NULL;
+ }
+ return z;
+}
+
+static char *get_mm_stat(struct zram *z, size_t idx, int bytes)
+{
+ struct sysfs_cxt *sysfs;
+ const char *name;
+ uint64_t num;
+
+ assert(idx < ARRAY_SIZE(mm_stat_names));
+ assert(z);
+
+ sysfs = zram_get_sysfs(z);
+ if (!sysfs)
+ return NULL;
+
+ /* Linux >= 4.1 uses /sys/block/zram<id>/mm_stat */
+ if (!z->mm_stat && !z->mm_stat_probed) {
+ char *str;
+
+ str = sysfs_strdup(sysfs, "mm_stat");
+ if (str) {
+ z->mm_stat = strv_split(str, " ");
+ if (strv_length(z->mm_stat) < ARRAY_SIZE(mm_stat_names))
+ errx(EXIT_FAILURE, _("Failed to parse mm_stat"));
+ }
+ z->mm_stat_probed = 1;
+ free(str);
+
+ }
+
+ if (z->mm_stat) {
+ if (bytes)
+ return xstrdup(z->mm_stat[idx]);
+
+ num = strtou64_or_err(z->mm_stat[idx], _("Failed to parse mm_stat"));
+ return size_to_human_string(SIZE_SUFFIX_1LETTER, num);
+ }
+
+ /* Linux < 4.1 uses /sys/block/zram<id>/<attrname> */
+ name = mm_stat_names[idx];
+ if (bytes)
+ return sysfs_strdup(sysfs, name);
+ else if (sysfs_read_u64(sysfs, name, &num) == 0)
+ return size_to_human_string(SIZE_SUFFIX_1LETTER, num);
+ return NULL;
+}
+
+static void fill_table_row(struct libscols_table *tb, struct zram *z)
+{
+ static struct libscols_line *ln;
+ struct sysfs_cxt *sysfs;
+ size_t i;
+ uint64_t num;
+
+ assert(tb);
+ assert(z);
+
+ DBG(fprintf(stderr, "%s: filling status table", z->devname));
+
+ sysfs = zram_get_sysfs(z);
+ if (!sysfs)
+ return;
+
+ ln = scols_table_new_line(tb, NULL);
+ if (!ln)
+ err(EXIT_FAILURE, _("failed to initialize output line"));
+
+ for (i = 0; i < (size_t) ncolumns; i++) {
+ char *str = NULL;
+
+ switch (get_column_id(i)) {
+ case COL_NAME:
+ str = xstrdup(z->devname);
+ break;
+ case COL_DISKSIZE:
+ if (inbytes)
+ str = sysfs_strdup(sysfs, "disksize");
+ else if (sysfs_read_u64(sysfs, "disksize", &num) == 0)
+ str = size_to_human_string(SIZE_SUFFIX_1LETTER, num);
+ break;
+ case COL_ALGORITHM:
+ {
+ char *alg = sysfs_strdup(sysfs, "comp_algorithm");
+ if (!alg)
+ break;
+ if (strstr(alg, "[lzo]") == NULL) {
+ if (strstr(alg, "[lz4]") == NULL)
+ ;
+ else
+ str = xstrdup("lz4");
+ } else
+ str = xstrdup("lzo");
+ free(alg);
+ break;
+ }
+ case COL_MOUNTPOINT:
+ {
+ char path[PATH_MAX] = { '\0' };
+ int fl;
+
+ check_mount_point(z->devname, &fl, path, sizeof(path));
+ if (*path)
+ str = xstrdup(path);
+ break;
+ }
+ case COL_STREAMS:
+ str = sysfs_strdup(sysfs, "max_comp_streams");
+ break;
+ case COL_ZEROPAGES:
+ str = get_mm_stat(z, MM_ZERO_PAGES, 1);
+ break;
+ case COL_ORIG_SIZE:
+ str = get_mm_stat(z, MM_ORIG_DATA_SIZE, inbytes);
+ break;
+ case COL_COMP_SIZE:
+ str = get_mm_stat(z, MM_COMPR_DATA_SIZE, inbytes);
+ break;
+ case COL_MEMTOTAL:
+ str = get_mm_stat(z, MM_MEM_USED_TOTAL, inbytes);
+ break;
+ case COL_MEMLIMIT:
+ str = get_mm_stat(z, MM_MEM_LIMIT, inbytes);
+ break;
+ case COL_MEMUSED:
+ str = get_mm_stat(z, MM_MEM_USED_MAX, inbytes);
+ break;
+ case COL_MIGRATED:
+ str = get_mm_stat(z, MM_NUM_MIGRATED, inbytes);
+ break;
+ }
+ if (str)
+ scols_line_refer_data(ln, i, str);
+ }
+}
+
+static void status(struct zram *z)
+{
+ struct libscols_table *tb;
+ size_t i;
+
+ scols_init_debug(0);
+
+ tb = scols_new_table();
+ if (!tb)
+ err(EXIT_FAILURE, _("failed to initialize output table"));
+
+ scols_table_enable_raw(tb, raw);
+ scols_table_enable_noheadings(tb, no_headings);
+
+ for (i = 0; i < (size_t) ncolumns; i++) {
+ const struct colinfo *col = get_column_info(i);
+
+ if (!scols_table_new_column(tb, col->name, col->whint, col->flags))
+ err(EXIT_FAILURE, _("failed to initialize output column"));
+ }
+
+ if (z)
+ fill_table_row(tb, z); /* just one device specified */
+ else {
+ /* list all used devices */
+ z = new_zram(NULL);
+
+ for (i = 0; ; i++) {
+ zram_set_devname(z, NULL, i);
+ if (!zram_exist(z))
+ break;
+ if (zram_used(z))
+ fill_table_row(tb, z);
+ }
+ free_zram(z);
+ }
+
+ scols_print_table(tb);
+ scols_unref_table(tb);
+}
+
+static void __attribute__ ((__noreturn__)) usage(FILE * out)
+{
+ size_t i;
+
+ fputs(USAGE_HEADER, out);
+ fprintf(out, _( " %1$s [options] <device>\n"
+ " %1$s -r <device> [...]\n"
+ " %1$s [options] -f | <device> -s <size>\n"),
+ program_invocation_short_name);
+
+ fputs(USAGE_SEPARATOR, out);
+ fputs(_("Set up and control zram devices.\n"), out);
+
+ fputs(USAGE_OPTIONS, out);
+ fputs(_(" -a, --algorithm lzo|lz4 compression algorithm to use\n"), out);
+ fputs(_(" -b, --bytes print sizes in bytes rather than in human readable format\n"), out);
+ fputs(_(" -f, --find find a free device\n"), out);
+ fputs(_(" -n, --noheadings don't print headings\n"), out);
+ fputs(_(" -o, --output <list> columns to use for status output\n"), out);
+ fputs(_(" --raw use raw status output format\n"), out);
+ fputs(_(" -r, --reset reset all specified devices\n"), out);
+ fputs(_(" -s, --size <size> device size\n"), out);
+ fputs(_(" -t, --streams <number> number of compression streams\n"), out);
+
+ fputs(USAGE_SEPARATOR, out);
+ fputs(USAGE_HELP, out);
+ fputs(USAGE_VERSION, out);
+
+ fputs(_("\nAvailable columns (for --output):\n"), out);
+ for (i = 0; i < ARRAY_SIZE(infos); i++)
+ fprintf(out, " %11s %s\n", infos[i].name, _(infos[i].help));
+
+ fprintf(out, USAGE_MAN_TAIL("zramctl(8)"));
+ exit(out == stderr ? 1 : EXIT_SUCCESS);
+}
+
+/* actions */
+enum {
+ A_NONE = 0,
+ A_STATUS,
+ A_CREATE,
+ A_FINDONLY,
+ A_RESET
+};
+
+int main(int argc, char **argv)
+{
+ uintmax_t size = 0, nstreams = 0;
+ char *algorithm = NULL;
+ int rc = 0, c, find = 0, act = A_NONE;
+ struct zram *zram = NULL;
+
+ enum { OPT_RAW = CHAR_MAX + 1 };
+
+ static const struct option longopts[] = {
+ { "algorithm", required_argument, NULL, 'a' },
+ { "bytes", no_argument, NULL, 'b' },
+ { "find", no_argument, NULL, 'f' },
+ { "help", no_argument, NULL, 'h' },
+ { "output", required_argument, NULL, 'o' },
+ { "noheadings",no_argument, NULL, 'n' },
+ { "reset", no_argument, NULL, 'r' },
+ { "raw", no_argument, NULL, OPT_RAW },
+ { "size", required_argument, NULL, 's' },
+ { "streams", required_argument, NULL, 't' },
+ { "version", no_argument, NULL, 'V' },
+ { NULL, 0, NULL, 0 }
+ };
+
+ static const ul_excl_t excl[] = {
+ { 'f', 'o', 'r' },
+ { 'o', 'r', 's' },
+ { 0 }
+ };
+ int excl_st[ARRAY_SIZE(excl)] = UL_EXCL_STATUS_INIT;
+
+ setlocale(LC_ALL, "");
+ bindtextdomain(PACKAGE, LOCALEDIR);
+ textdomain(PACKAGE);
+ atexit(close_stdout);
+
+ while ((c = getopt_long(argc, argv, "a:bfho:nrs:t:V", longopts, NULL)) != -1) {
+
+ err_exclusive_options(c, longopts, excl, excl_st);
+
+ switch (c) {
+ case 'a':
+ if (strcmp(optarg,"lzo") && strcmp(optarg,"lz4"))
+ errx(EXIT_FAILURE, _("unsupported algorithm: %s"),
+ optarg);
+ algorithm = optarg;
+ break;
+ case 'b':
+ inbytes = 1;
+ break;
+ case 'f':
+ find = 1;
+ break;
+ case 'o':
+ ncolumns = string_to_idarray(optarg,
+ columns, ARRAY_SIZE(columns),
+ column_name_to_id);
+ if (ncolumns < 0)
+ return EXIT_FAILURE;
+ break;
+ case 's':
+ size = strtosize_or_err(optarg, _("failed to parse size"));
+ act = A_CREATE;
+ break;
+ case 't':
+ nstreams = strtou64_or_err(optarg, _("failed to parse streams"));
+ break;
+ case 'r':
+ act = A_RESET;
+ break;
+ case OPT_RAW:
+ raw = 1;
+ break;
+ case 'n':
+ no_headings = 1;
+ break;
+ case 'V':
+ printf(UTIL_LINUX_VERSION);
+ return EXIT_SUCCESS;
+ case 'h':
+ usage(stdout);
+ default:
+ usage(stderr);
+ }
+ }
+
+ if (find && optind < argc)
+ errx(EXIT_FAILURE, _("option --find is mutually exclusive "
+ "with <device>"));
+ if (act == A_NONE)
+ act = find ? A_FINDONLY : A_STATUS;
+
+ if (act != A_RESET && optind + 1 < argc)
+ errx(EXIT_FAILURE, _("only one <device> at a time is allowed"));
+
+ if ((act == A_STATUS || act == A_FINDONLY) && (algorithm || nstreams))
+ errx(EXIT_FAILURE, _("options --algorithm and --streams "
+ "must be combined with --size"));
+
+ switch (act) {
+ case A_STATUS:
+ if (!ncolumns) { /* default columns */
+ columns[ncolumns++] = COL_NAME;
+ columns[ncolumns++] = COL_ALGORITHM;
+ columns[ncolumns++] = COL_DISKSIZE;
+ columns[ncolumns++] = COL_ORIG_SIZE;
+ columns[ncolumns++] = COL_COMP_SIZE;
+ columns[ncolumns++] = COL_MEMTOTAL;
+ columns[ncolumns++] = COL_STREAMS;
+ columns[ncolumns++] = COL_MOUNTPOINT;
+ }
+ if (optind < argc) {
+ zram = new_zram(argv[optind++]);
+ if (!zram_exist(zram))
+ err(EXIT_FAILURE, "%s", zram->devname);
+ }
+ status(zram);
+ free_zram(zram);
+ break;
+ case A_RESET:
+ if (optind == argc)
+ errx(EXIT_FAILURE, _("no device specified"));
+ while (optind < argc) {
+ zram = new_zram(argv[optind]);
+ if (!zram_exist(zram)
+ || zram_set_u64parm(zram, "reset", 1)) {
+ warn(_("%s: failed to reset"), zram->devname);
+ rc = 1;
+ }
+ zram_control_remove(zram);
+ free_zram(zram);
+ optind++;
+ }
+ break;
+ case A_FINDONLY:
+ zram = find_free_zram();
+ if (!zram)
+ errx(EXIT_FAILURE, _("no free zram device found"));
+ printf("%s\n", zram->devname);
+ free_zram(zram);
+ break;
+ case A_CREATE:
+ if (find) {
+ zram = find_free_zram();
+ if (!zram)
+ errx(EXIT_FAILURE, _("no free zram device found"));
+ } else if (optind == argc)
+ errx(EXIT_FAILURE, _("no device specified"));
+ else {
+ zram = new_zram(argv[optind]);
+ if (!zram_exist(zram))
+ err(EXIT_FAILURE, "%s", zram->devname);
+ }
+
+ if (zram_set_u64parm(zram, "reset", 1))
+ err(EXIT_FAILURE, _("%s: failed to reset"), zram->devname);
+
+ if (nstreams &&
+ zram_set_u64parm(zram, "max_comp_streams", nstreams))
+ err(EXIT_FAILURE, _("%s: failed to set number of streams"), zram->devname);
+
+ if (algorithm &&
+ zram_set_strparm(zram, "comp_algorithm", algorithm))
+ err(EXIT_FAILURE, _("%s: failed to set algorithm"), zram->devname);
+
+ if (zram_set_u64parm(zram, "disksize", size))
+ err(EXIT_FAILURE, _("%s: failed to set disksize (%ju bytes)"),
+ zram->devname, size);
+ if (find)
+ printf("%s\n", zram->devname);
+ free_zram(zram);
+ break;
+ }
+
+ return rc ? EXIT_FAILURE : EXIT_SUCCESS;
+}
--
2.9.3