- shrink mkswap and make v0 support optional. Thanks also to Tito for his ideas.
http://busybox.net/lists/busybox/2006-March/019326.html 2137 8 28 2173 87d util-linux/mkswap.o.orig 1890 8 28 1926 786 util-linux/mkswap.o.v0+v1 1560 4 28 1592 638 util-linux/mkswap.o.v1
This commit is contained in:
Bernhard Reutner-Fischer
parent
b256bd334f
commit
56dd0bff06
@ -288,6 +288,16 @@ config CONFIG_MKSWAP
|
||||
Once you have created swap space using 'mkswap' you need to enable
|
||||
the swap space using the 'swapon' utility.
|
||||
|
||||
config CONFIG_FEATURE_MKSWAP_V0
|
||||
bool " version 0 support"
|
||||
default n
|
||||
depends on CONFIG_MKSWAP
|
||||
# depends on CONFIG_MKSWAP && CONFIG_DEPRECATED
|
||||
help
|
||||
Enable support for the old v0 style.
|
||||
If your kernel is older than 2.1.117, then v0 support is the
|
||||
only option.
|
||||
|
||||
config CONFIG_MORE
|
||||
bool "more"
|
||||
default n
|
||||
|
||||
@ -59,9 +59,17 @@ static int DEV = -1;
|
||||
static long PAGES = 0;
|
||||
static int check = 0;
|
||||
static int badpages = 0;
|
||||
#if ENABLE_FEATURE_MKSWAP_V0
|
||||
static int version = -1;
|
||||
|
||||
#define MAKE_VERSION(p,q,r) (65536*(p) + 256*(q) + (r))
|
||||
#else
|
||||
#define version 1
|
||||
/* and make sure that we optimize away anything which would deal with checking
|
||||
* the kernel revision as we have v1 support only anyway.
|
||||
*/
|
||||
#define MAKE_VERSION(p,q,r) 1
|
||||
#define get_kernel_revision() 1
|
||||
#endif
|
||||
|
||||
/*
|
||||
* The definition of the union swap_header uses the constant PAGE_SIZE.
|
||||
@ -74,7 +82,7 @@ static unsigned int *signature_page;
|
||||
|
||||
static struct swap_header_v1 {
|
||||
char bootbits[1024]; /* Space for disklabel etc. */
|
||||
unsigned int version;
|
||||
unsigned int swap_version;
|
||||
unsigned int last_page;
|
||||
unsigned int nr_badpages;
|
||||
unsigned int padding[125];
|
||||
@ -172,23 +180,11 @@ static int bit_test_and_clear(unsigned int *addr, unsigned int nr)
|
||||
return (r & m) != 0;
|
||||
}
|
||||
|
||||
|
||||
static void page_ok(int page)
|
||||
{
|
||||
if (version == 0)
|
||||
if (ENABLE_FEATURE_MKSWAP_V0) {
|
||||
bit_set(signature_page, page);
|
||||
}
|
||||
|
||||
static inline void page_bad(int page)
|
||||
{
|
||||
if (version == 0)
|
||||
bit_test_and_clear(signature_page, page);
|
||||
else {
|
||||
if (badpages == MAX_BADPAGES)
|
||||
bb_error_msg_and_die("too many bad pages");
|
||||
p->badpages[badpages] = page;
|
||||
}
|
||||
badpages++;
|
||||
}
|
||||
|
||||
static void check_blocks(void)
|
||||
@ -200,7 +196,7 @@ static void check_blocks(void)
|
||||
buffer = xmalloc(pagesize);
|
||||
current_page = 0;
|
||||
while (current_page < PAGES) {
|
||||
if (!check) {
|
||||
if (!check && version == 0) {
|
||||
page_ok(current_page++);
|
||||
continue;
|
||||
}
|
||||
@ -208,15 +204,23 @@ static void check_blocks(void)
|
||||
current_page * pagesize)
|
||||
bb_error_msg_and_die("seek failed in check_blocks");
|
||||
if ((do_seek = (pagesize != read(DEV, buffer, pagesize)))) {
|
||||
page_bad(current_page++);
|
||||
current_page++;
|
||||
if (version == 0)
|
||||
bit_test_and_clear(signature_page, current_page);
|
||||
else {
|
||||
if (badpages == MAX_BADPAGES)
|
||||
bb_error_msg_and_die("too many bad pages");
|
||||
p->badpages[badpages] = current_page;
|
||||
}
|
||||
badpages++;
|
||||
continue;
|
||||
}
|
||||
page_ok(current_page++);
|
||||
}
|
||||
if (badpages == 1)
|
||||
printf("one bad page\n");
|
||||
else if (badpages > 1)
|
||||
printf("%d bad pages\n", badpages);
|
||||
if (ENABLE_FEATURE_CLEAN_UP)
|
||||
free(buffer);
|
||||
if (badpages > 0)
|
||||
printf("%d bad page%s\n", badpages, (badpages==1)?"":"s");
|
||||
}
|
||||
|
||||
static long valid_offset(int fd, int offset)
|
||||
@ -249,17 +253,15 @@ static int find_size(int fd)
|
||||
}
|
||||
|
||||
/* return size in pages, to avoid integer overflow */
|
||||
static long get_size(const char *file)
|
||||
static inline long get_size(const char *file)
|
||||
{
|
||||
int fd;
|
||||
long size;
|
||||
|
||||
if ((fd = open(file, O_RDONLY)) < 0)
|
||||
if ((fd = open(file, O_RDONLY)) < 0) /* TODO: bb_xopen3 */
|
||||
bb_perror_msg_and_die("%s", file);
|
||||
if (ioctl(fd, BLKGETSIZE, &size) >= 0) {
|
||||
int sectors_per_page = pagesize / 512;
|
||||
|
||||
size /= sectors_per_page;
|
||||
size /= pagesize / 512;
|
||||
} else {
|
||||
size = find_size(fd) / pagesize;
|
||||
}
|
||||
@ -274,66 +276,53 @@ int mkswap_main(int argc, char **argv)
|
||||
int sz;
|
||||
int maxpages;
|
||||
int goodpages;
|
||||
int offset;
|
||||
#ifdef __sparc__
|
||||
int force = 0;
|
||||
#endif
|
||||
|
||||
init_signature_page(); /* get pagesize */
|
||||
|
||||
while (argc-- > 1) {
|
||||
argv++;
|
||||
if (argv[0][0] != '-') {
|
||||
if (device_name) {
|
||||
int blocks_per_page = pagesize / 1024;
|
||||
|
||||
PAGES = strtol(argv[0], &tmp, 0) / blocks_per_page;
|
||||
if (*tmp)
|
||||
bb_show_usage();
|
||||
} else
|
||||
device_name = argv[0];
|
||||
} else {
|
||||
switch (argv[0][1]) {
|
||||
case 'c':
|
||||
bb_opt_complementally = "?"; /* call bb_show_usage internally */
|
||||
sz = bb_getopt_ulflags(argc, argv, "+cfv:", &tmp);
|
||||
if (sz & 1)
|
||||
check = 1;
|
||||
break;
|
||||
case 'f':
|
||||
#ifdef __sparc__
|
||||
if (sz & 2)
|
||||
force = 1;
|
||||
break;
|
||||
case 'v':
|
||||
version = atoi(argv[0] + 2);
|
||||
break;
|
||||
default:
|
||||
bb_show_usage();
|
||||
}
|
||||
}
|
||||
}
|
||||
if (!device_name) {
|
||||
bb_error_msg("error: Nowhere to set up swap on?");
|
||||
bb_show_usage();
|
||||
}
|
||||
sz = get_size(device_name);
|
||||
if (!PAGES) {
|
||||
PAGES = sz;
|
||||
} else if (PAGES > sz && !force) {
|
||||
bb_error_msg("error: size %ld is larger than device size %d",
|
||||
PAGES * (pagesize / 1024), sz * (pagesize / 1024));
|
||||
return EXIT_FAILURE;
|
||||
}
|
||||
|
||||
if (version == -1) {
|
||||
#endif
|
||||
#if ENABLE_FEATURE_MKSWAP_V0
|
||||
if (sz & 4) {
|
||||
version = bb_xgetlarg(tmp, 10, 0, 1);
|
||||
} else {
|
||||
if (get_kernel_revision() < MAKE_VERSION(2, 1, 117))
|
||||
version = 0;
|
||||
else
|
||||
version = 1;
|
||||
}
|
||||
if (version != 0 && version != 1) {
|
||||
bb_error_msg("error: unknown version %d", version);
|
||||
bb_show_usage();
|
||||
#endif
|
||||
|
||||
argv += optind;
|
||||
argc -= optind;
|
||||
|
||||
goodpages = pagesize / 1024; /* cache division */
|
||||
while (argc--) {
|
||||
if (device_name) {
|
||||
PAGES = bb_xgetlarg(argv[0], 0, 10, sz * goodpages) / goodpages;
|
||||
argc = 0; /* ignore any surplus args.. */
|
||||
} else {
|
||||
device_name = argv[0];
|
||||
sz = get_size(device_name);
|
||||
argv++;
|
||||
}
|
||||
if (PAGES < 10) {
|
||||
bb_error_msg("error: swap area needs to be at least %ldkB",
|
||||
(long) (10 * pagesize / 1024));
|
||||
bb_show_usage();
|
||||
}
|
||||
|
||||
if (!device_name) {
|
||||
bb_error_msg_and_die("error: Nowhere to set up swap on?");
|
||||
}
|
||||
if (!PAGES) {
|
||||
PAGES = sz;
|
||||
}
|
||||
|
||||
#if 0
|
||||
maxpages = ((version == 0) ? V0_MAX_PAGES : V1_MAX_PAGES);
|
||||
#else
|
||||
@ -350,7 +339,7 @@ int mkswap_main(int argc, char **argv)
|
||||
if (PAGES > maxpages) {
|
||||
PAGES = maxpages;
|
||||
bb_error_msg("warning: truncating swap area to %ldkB",
|
||||
PAGES * pagesize / 1024);
|
||||
PAGES * goodpages);
|
||||
}
|
||||
|
||||
DEV = open(device_name, O_RDWR);
|
||||
@ -389,7 +378,7 @@ int mkswap_main(int argc, char **argv)
|
||||
if (version == 0 && !bit_test_and_clear(signature_page, 0))
|
||||
bb_error_msg_and_die("fatal: first page unreadable");
|
||||
if (version == 1) {
|
||||
p->version = version;
|
||||
p->swap_version = version;
|
||||
p->last_page = PAGES - 1;
|
||||
p->nr_badpages = badpages;
|
||||
}
|
||||
@ -401,11 +390,12 @@ int mkswap_main(int argc, char **argv)
|
||||
version, (long) (goodpages * pagesize));
|
||||
write_signature((version == 0) ? "SWAP-SPACE" : "SWAPSPACE2");
|
||||
|
||||
offset = ((version == 0) ? 0 : 1024);
|
||||
if (lseek(DEV, offset, SEEK_SET) != offset)
|
||||
sz = ((version == 0) ? 0 : 1024); /* offset */
|
||||
if (lseek(DEV, sz, SEEK_SET) != sz)
|
||||
bb_error_msg_and_die("unable to rewind swap-device");
|
||||
if (write(DEV, (char *) signature_page + offset, pagesize - offset)
|
||||
!= pagesize - offset)
|
||||
goodpages = pagesize - sz; /* cache substraction */
|
||||
if (write(DEV, (char *) signature_page + sz, goodpages)
|
||||
!= goodpages)
|
||||
bb_error_msg_and_die("unable to write signature page");
|
||||
|
||||
/*
|
||||
@ -414,5 +404,9 @@ int mkswap_main(int argc, char **argv)
|
||||
*/
|
||||
if (fsync(DEV))
|
||||
bb_error_msg_and_die("fsync failed");
|
||||
if (ENABLE_FEATURE_CLEAN_UP) {
|
||||
close(DEV);
|
||||
free(signature_page);
|
||||
}
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user