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mkXXXX: unify [KBYTES] parameter handling (added it to mkswap)

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2010-02-01 23:48:27 +01:00
parent 4875e7148b
commit 40e7d25aca
8 changed files with 66 additions and 49 deletions
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5
include/libbb.h
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@ -412,6 +412,11 @@ int rename_or_warn(const char *oldpath, const char *newpath) FAST_FUNC;
off_t xlseek(int fd, off_t offset, int whence) FAST_FUNC;
off_t fdlength(int fd) FAST_FUNC;
uoff_t FAST_FUNC get_volume_size_in_bytes(int fd,
const char *override,
unsigned override_units,
int extend);
void xpipe(int filedes[2]) FAST_FUNC;
/* In this form code with pipes is much more readable */
struct fd_pair { int rd; int wr; };

2
include/usage.h
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@ -2844,7 +2844,7 @@
"$ mknod -m 644 /tmp/pipe p\n"
#define mkswap_trivial_usage \
"[OPTIONS] BLOCKDEV" /* [SIZE_IN_KB] */
"[OPTIONS] BLOCKDEV [KBYTES]"
#define mkswap_full_usage "\n\n" \
"Prepare BLOCKDEV to be used as swap partition\n" \
"\nOptions:" \

1
libbb/Kbuild
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@ -42,6 +42,7 @@ lib-y += get_last_path_component.o
lib-y += get_line_from_file.o
lib-y += getopt32.o
lib-y += getpty.o
lib-y += get_volsize.o
lib-y += herror_msg.o
lib-y += herror_msg_and_die.o
lib-y += human_readable.o

48
libbb/get_volsize.c Normal file
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@ -0,0 +1,48 @@
/* vi: set sw=4 ts=4: */
/*
* Utility routines.
*
* Copyright (C) 2010 Denys Vlasenko
*
* Licensed under GPLv2, see file LICENSE in this tarball for details.
*/
#include "libbb.h"
uoff_t FAST_FUNC get_volume_size_in_bytes(int fd,
const char *override,
unsigned override_units,
int extend)
{
uoff_t result;
if (override) {
result = XATOOFF(override);
if (result >= (uoff_t)(MAXINT(off_t)) / override_units)
bb_error_msg_and_die("image size is too big");
result *= override_units;
/* seek past end fails on block devices but works on files */
if (lseek(fd, result - 1, SEEK_SET) != (off_t)-1) {
if (extend)
xwrite(fd, "", 1); /* file grows if needed */
}
//else {
// bb_error_msg("warning, block device is smaller");
//}
} else {
/* more portable than BLKGETSIZE[64] */
result = xlseek(fd, 0, SEEK_END);
}
xlseek(fd, 0, SEEK_SET);
/* Prevent things like this:
* $ dd if=/dev/zero of=foo count=1 bs=1024
* $ mkswap foo
* Setting up swapspace version 1, size = 18446744073709548544 bytes
*
* Picked 16k arbitrarily: */
if (result < 16*1024)
bb_error_msg_and_die("image is too small");
return result;
}

14
util-linux/mkfs_ext2.c
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@ -230,19 +230,7 @@ int mkfs_ext2_main(int argc UNUSED_PARAM, char **argv)
bb_error_msg_and_die("can't format mounted filesystem");
// open the device, get size in kbytes
if (argv[1]) {
kilobytes = xatoull(argv[1]);
// seek past end fails on block devices but works on files
if (lseek(fd, kilobytes * 1024 - 1, SEEK_SET) != (off_t)-1) {
if (!(option_mask32 & OPT_n))
xwrite(fd, "", 1); // file grows if needed
}
//else {
// bb_error_msg("warning, block device is smaller");
//}
} else {
kilobytes = (uoff_t)xlseek(fd, 0, SEEK_END) / 1024;
}
kilobytes = get_volume_size_in_bytes(fd, argv[1], 1024, /*extend:*/ !(option_mask32 & OPT_n)) / 1024;
bytes_per_inode = 16384;
if (kilobytes < 512*1024)

15
util-linux/mkfs_reiser.c
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@ -175,23 +175,12 @@ int mkfs_reiser_main(int argc UNUSED_PARAM, char **argv)
// check if it is mounted
// N.B. what if we format a file? find_mount_point will return false negative since
// it is loop block device which mounted!
// it is loop block device which is mounted!
if (find_mount_point(argv[0], 0))
bb_error_msg_and_die("can't format mounted filesystem");
// open the device, get size in blocks
if (argv[1]) {
blocks = xatoull(argv[1]);
// seek past end fails on block devices but works on files
if (lseek(fd, blocks * blocksize - 1, SEEK_SET) != (off_t)-1) {
xwrite(fd, "", 1); // file grows if needed
}
//else {
// bb_error_msg("warning, block device is smaller");
//}
} else {
blocks = (uoff_t)xlseek(fd, 0, SEEK_END) / blocksize;
}
blocks = get_volume_size_in_bytes(fd, argv[1], blocksize, /*extend:*/ 1) / blocksize;
// block number sanity check
// we have a limit: skipped area, super block, journal and root block

14
util-linux/mkfs_vfat.c
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@ -244,7 +244,7 @@ int mkfs_vfat_main(int argc UNUSED_PARAM, char **argv)
// default volume ID = creation time
volume_id = time(NULL);
dev = xopen(device_name, O_EXCL | O_RDWR);
dev = xopen(device_name, O_RDWR);
if (fstat(dev, &st) < 0)
bb_simple_perror_msg_and_die(device_name);
@ -252,7 +252,6 @@ int mkfs_vfat_main(int argc UNUSED_PARAM, char **argv)
// Get image size and sector size
//
bytes_per_sect = SECTOR_SIZE;
volume_size_bytes = st.st_size;
if (!S_ISBLK(st.st_mode)) {
if (!S_ISREG(st.st_mode)) {
if (!argv[1])
@ -262,10 +261,6 @@ int mkfs_vfat_main(int argc UNUSED_PARAM, char **argv)
opts &= ~OPT_c;
} else {
int min_bytes_per_sect;
// more portable than BLKGETSIZE[64]
volume_size_bytes = xlseek(dev, 0, SEEK_END);
xlseek(dev, 0, SEEK_SET);
#if 0
unsigned device_num;
// for true block devices we do check sanity
@ -290,12 +285,7 @@ int mkfs_vfat_main(int argc UNUSED_PARAM, char **argv)
bb_error_msg("for this device sector size is %u", min_bytes_per_sect);
}
}
if (argv[1]) {
volume_size_bytes = XATOOFF(argv[1]);
if (volume_size_bytes >= MAXINT(off_t) / 1024)
bb_error_msg_and_die("image size is too big");
volume_size_bytes *= 1024;
}
volume_size_bytes = get_volume_size_in_bytes(dev, argv[1], 1024, /*extend:*/ 1);
volume_size_sect = volume_size_bytes / bytes_per_sect;
//

16
util-linux/mkswap.c
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@ -86,23 +86,19 @@ int mkswap_main(int argc UNUSED_PARAM, char **argv)
off_t len;
const char *label = "";
opt_complementary = "=1";
/* TODO: -p PAGESZ, -U UUID,
* optional SIZE_IN_KB 2nd param
*/
opt_complementary = "-1"; /* at least one param */
/* TODO: -p PAGESZ, -U UUID */
getopt32(argv, "L:", &label);
argv += optind;
fd = xopen(argv[0], O_WRONLY);
/* Figure out how big the device is and announce our intentions */
/* fdlength was reported to be unreliable - use seek */
len = xlseek(fd, 0, SEEK_END);
if (ENABLE_SELINUX)
xlseek(fd, 0, SEEK_SET);
/* Figure out how big the device is */
len = get_volume_size_in_bytes(fd, argv[1], 1024, /*extend:*/ 1);
pagesize = getpagesize();
len -= pagesize;
/* Announce our intentions */
printf("Setting up swapspace version 1, size = %"OFF_FMT"u bytes\n", len);
mkswap_selinux_setcontext(fd, argv[0]);