| 1 | /* vi: set sw=4 ts=4: */
|
|---|
| 2 | /*
|
|---|
| 3 | * Mini swapon/swapoff implementation for busybox
|
|---|
| 4 | *
|
|---|
| 5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
|
|---|
| 6 | *
|
|---|
| 7 | * Licensed under GPLv2, see file LICENSE in this source tree.
|
|---|
| 8 | */
|
|---|
| 9 |
|
|---|
| 10 | #include "libbb.h"
|
|---|
| 11 | #include <mntent.h>
|
|---|
| 12 | #include <sys/swap.h>
|
|---|
| 13 |
|
|---|
| 14 | #if ENABLE_FEATURE_MOUNT_LABEL
|
|---|
| 15 | # include "volume_id.h"
|
|---|
| 16 | #else
|
|---|
| 17 | # define resolve_mount_spec(fsname) ((void)0)
|
|---|
| 18 | #endif
|
|---|
| 19 |
|
|---|
| 20 | #if ENABLE_FEATURE_SWAPON_PRI
|
|---|
| 21 | struct globals {
|
|---|
| 22 | int flags;
|
|---|
| 23 | } FIX_ALIASING;
|
|---|
| 24 | #define G (*(struct globals*)&bb_common_bufsiz1)
|
|---|
| 25 | #define g_flags (G.flags)
|
|---|
| 26 | #else
|
|---|
| 27 | #define g_flags 0
|
|---|
| 28 | #endif
|
|---|
| 29 |
|
|---|
| 30 | static int swap_enable_disable(char *device)
|
|---|
| 31 | {
|
|---|
| 32 | int status;
|
|---|
| 33 | struct stat st;
|
|---|
| 34 |
|
|---|
| 35 | resolve_mount_spec(&device);
|
|---|
| 36 | xstat(device, &st);
|
|---|
| 37 |
|
|---|
| 38 | #if ENABLE_DESKTOP
|
|---|
| 39 | /* test for holes */
|
|---|
| 40 | if (S_ISREG(st.st_mode))
|
|---|
| 41 | if (st.st_blocks * (off_t)512 < st.st_size)
|
|---|
| 42 | bb_error_msg("warning: swap file has holes");
|
|---|
| 43 | #endif
|
|---|
| 44 |
|
|---|
| 45 | if (applet_name[5] == 'n')
|
|---|
| 46 | status = swapon(device, g_flags);
|
|---|
| 47 | else
|
|---|
| 48 | status = swapoff(device);
|
|---|
| 49 |
|
|---|
| 50 | if (status != 0) {
|
|---|
| 51 | bb_simple_perror_msg(device);
|
|---|
| 52 | return 1;
|
|---|
| 53 | }
|
|---|
| 54 |
|
|---|
| 55 | return 0;
|
|---|
| 56 | }
|
|---|
| 57 |
|
|---|
| 58 | static int do_em_all(void)
|
|---|
| 59 | {
|
|---|
| 60 | struct mntent *m;
|
|---|
| 61 | FILE *f;
|
|---|
| 62 | int err;
|
|---|
| 63 |
|
|---|
| 64 | f = setmntent("/etc/fstab", "r");
|
|---|
| 65 | if (f == NULL)
|
|---|
| 66 | bb_perror_msg_and_die("/etc/fstab");
|
|---|
| 67 |
|
|---|
| 68 | err = 0;
|
|---|
| 69 | while ((m = getmntent(f)) != NULL) {
|
|---|
| 70 | if (strcmp(m->mnt_type, MNTTYPE_SWAP) == 0) {
|
|---|
| 71 | /* swapon -a should ignore entries with noauto,
|
|---|
| 72 | * but swapoff -a should process them */
|
|---|
| 73 | if (applet_name[5] != 'n'
|
|---|
| 74 | || hasmntopt(m, MNTOPT_NOAUTO) == NULL
|
|---|
| 75 | ) {
|
|---|
| 76 | err += swap_enable_disable(m->mnt_fsname);
|
|---|
| 77 | }
|
|---|
| 78 | }
|
|---|
| 79 | }
|
|---|
| 80 |
|
|---|
| 81 | if (ENABLE_FEATURE_CLEAN_UP)
|
|---|
| 82 | endmntent(f);
|
|---|
| 83 |
|
|---|
| 84 | return err;
|
|---|
| 85 | }
|
|---|
| 86 |
|
|---|
| 87 | int swap_on_off_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|---|
| 88 | int swap_on_off_main(int argc UNUSED_PARAM, char **argv)
|
|---|
| 89 | {
|
|---|
| 90 | int ret;
|
|---|
| 91 |
|
|---|
| 92 | #if !ENABLE_FEATURE_SWAPON_PRI
|
|---|
| 93 | ret = getopt32(argv, "a");
|
|---|
| 94 | #else
|
|---|
| 95 | opt_complementary = "p+";
|
|---|
| 96 | ret = getopt32(argv, (applet_name[5] == 'n') ? "ap:" : "a", &g_flags);
|
|---|
| 97 |
|
|---|
| 98 | if (ret & 2) { // -p
|
|---|
| 99 | g_flags = SWAP_FLAG_PREFER |
|
|---|
| 100 | ((g_flags & SWAP_FLAG_PRIO_MASK) << SWAP_FLAG_PRIO_SHIFT);
|
|---|
| 101 | ret &= 1;
|
|---|
| 102 | }
|
|---|
| 103 | #endif
|
|---|
| 104 |
|
|---|
| 105 | if (ret /* & 1: not needed */) // -a
|
|---|
| 106 | return do_em_all();
|
|---|
| 107 |
|
|---|
| 108 | argv += optind;
|
|---|
| 109 | if (!*argv)
|
|---|
| 110 | bb_show_usage();
|
|---|
| 111 |
|
|---|
| 112 | /* ret = 0; redundant */
|
|---|
| 113 | do {
|
|---|
| 114 | ret += swap_enable_disable(*argv);
|
|---|
| 115 | } while (*++argv);
|
|---|
| 116 |
|
|---|
| 117 | return ret;
|
|---|
| 118 | }
|
|---|
