Jeff Mahoney
47cff72748
Over the years, the reiserfs kernel code has been gradually cleaned up to be more readable. This patch does the same to the progs code. Signed-off-by: Jeff Mahoney <jeffm@suse.com>
359 lines
8.4 KiB
C
359 lines
8.4 KiB
C
/*
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* Copyright 2000-2004 by Hans Reiser, licensing governed by
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* reiserfsprogs/README
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*/
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/*
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* Written by Alexander Zarochentcev.
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*
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* FS resize utility
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*
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*/
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#define _GNU_SOURCE
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#include "resize.h"
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#include <limits.h>
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int opt_banner = 0;
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int opt_force = 0;
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int opt_verbose = 1; /* now "verbose" option is default */
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int opt_nowrite = 0;
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int opt_safe = 0;
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int opt_skipj = 0;
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char *g_progname;
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/* calculate the new fs size (in blocks) from old fs size and the string
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representation of new size */
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static long long int calc_new_fs_size(unsigned long count,
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unsigned int bs, char *bytes_str)
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{
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long long int bytes;
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long long int blocks;
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char *end;
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int rel;
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end = bytes_str + strlen(bytes_str) - 1;
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rel = bytes_str[0] == '+' || bytes_str[0] == '-';
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bytes = strtoll(bytes_str, &bytes_str, 10);
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/* Some error occured while convertion or the specified
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string is not valid. */
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if (bytes == LONG_LONG_MIN || bytes == LONG_LONG_MAX ||
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(bytes_str != end && bytes_str != end + 1))
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return -EINVAL;
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switch (*end) {
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case 'G':
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case 'g':
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bytes *= 1024;
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case 'M':
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case 'm':
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bytes *= 1024;
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case 'K':
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case 'k':
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bytes *= 1024;
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}
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blocks = bytes / bs;
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return rel ? count + blocks : blocks;
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}
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/* print some fs parameters */
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static void sb_report(struct reiserfs_super_block *sb1,
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struct reiserfs_super_block *sb2)
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{
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printf("ReiserFS report:\n"
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"blocksize %u\n"
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"block count %u (%u)\n"
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"free blocks %u (%u)\n"
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"bitmap block count %u (%u)\n",
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get_sb_block_size(sb1),
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get_sb_block_count(sb1), get_sb_block_count(sb2),
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get_sb_free_blocks(sb1), get_sb_free_blocks(sb2),
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get_sb_bmap_nr(sb1), get_sb_bmap_nr(sb2));
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};
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/* conditional bwrite */
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static int bwrite_cond(struct buffer_head *bh)
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{
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if (!opt_nowrite) {
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mark_buffer_uptodate(bh, 1);
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mark_buffer_dirty(bh);
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bwrite(bh);
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}
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return 0;
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}
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/* the first one of the most important functions */
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static int expand_fs(reiserfs_filsys_t *fs, long long int block_count_new)
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{
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unsigned int bmap_nr_new, bmap_nr_old;
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struct reiserfs_super_block *sb;
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unsigned int i;
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reiserfs_reopen(fs, O_RDWR);
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if (reiserfs_open_ondisk_bitmap(fs))
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reiserfs_exit(1, "cannot open ondisk bitmap");
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sb = fs->fs_ondisk_sb;
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set_sb_fs_state(fs->fs_ondisk_sb, FS_ERROR);
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bwrite_cond(fs->fs_super_bh);
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if (reiserfs_expand_bitmap(fs->fs_bitmap2, block_count_new))
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reiserfs_exit(1, "cannot expand bitmap\n");
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/* count bitmap blocks in new fs */
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bmap_nr_new = (block_count_new - 1) / (fs->fs_blocksize * 8) + 1;
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bmap_nr_old = reiserfs_fs_bmap_nr(fs);
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/* update super block buffer */
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set_sb_free_blocks(sb, get_sb_free_blocks(sb) +
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(block_count_new - get_sb_block_count(sb)) -
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(bmap_nr_new - bmap_nr_old));
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set_sb_block_count(sb, block_count_new);
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set_sb_bmap_nr(fs->fs_ondisk_sb,
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reiserfs_bmap_over(bmap_nr_new) ? 0 : bmap_nr_new);
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/* mark new bitmap blocks as used */
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for (i = bmap_nr_old; i < bmap_nr_new; i++)
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reiserfs_bitmap_set_bit(fs->fs_bitmap2,
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i * fs->fs_blocksize * 8);
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/* normally, this is done by reiserfs_bitmap_set_bit, but if we
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** haven't actually added any bitmap blocks, the bitmap won't be dirtied.
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**
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** In memory, reiserfsprogs puts zeros for the bits past the end of
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** the old filesystem. But, on disk that bitmap is full of ones.
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** we explicitly dirty the bitmap here to make sure the zeros get written
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** to disk
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*/
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fs->fs_bitmap2->bm_dirty = 1;
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return 0;
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}
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static int resizer_check_fs_size(reiserfs_filsys_t *fs, long long int new_size)
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{
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if (new_size < 0) {
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reiserfs_warning(stderr, "\nresizer_reiserfs: the new size "
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"value is wrong.\n\n");
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return new_size;
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}
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if (new_size == get_sb_block_count(fs->fs_ondisk_sb)) {
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reiserfs_warning(stderr, "%s already is of the needed size. "
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"Nothing to be done\n\n", fs->fs_file_name);
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return 1;
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}
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if (new_size < get_sb_block_count(fs->fs_ondisk_sb)) {
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if (misc_device_mounted(fs->fs_file_name) > 0) {
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reiserfs_warning(stderr,
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"Can't shrink filesystem on-line.\n\n");
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return 1;
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}
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}
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if (new_size >= get_sb_block_count(fs->fs_ondisk_sb)) {
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loff_t offset = (loff_t) new_size * fs->fs_blocksize - 1;
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if (!valid_offset(fs->fs_dev, offset)) {
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reiserfs_warning(stderr,
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"%s is of %lu blocks size only with "
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"reiserfs of %u blocks\nsize on it. You are "
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"trying to expand reiserfs up to %lu blocks "
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"size.\nYou probably forgot to expand your "
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"partition size.\n\n",
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fs->fs_file_name,
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count_blocks(fs->fs_file_name,
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fs->fs_blocksize),
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get_sb_block_count(fs->fs_ondisk_sb),
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new_size);
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return 1;
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}
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}
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return 0;
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}
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int main(int argc, char *argv[])
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{
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char *bytes_count_str = NULL;
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char *devname;
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char *jdevice_name = NULL;
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reiserfs_filsys_t *fs;
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struct reiserfs_super_block *sb;
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int c;
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int error;
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struct reiserfs_super_block *sb_old;
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long long int block_count_new;
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g_progname = basename(argv[0]);
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if (argc < 2)
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print_usage_and_exit();
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while ((c = getopt(argc, argv, "fvcqks:j:V")) != EOF) {
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switch (c) {
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case 's':
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if (!optarg)
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reiserfs_exit(1,
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"Missing argument to -s option");
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bytes_count_str = optarg;
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break;
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case 'j':
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if (!optarg)
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reiserfs_exit(1,
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"Missing argument to -j option");
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jdevice_name = optarg;
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case 'f':
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opt_force = 1;
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break;
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case 'v':
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opt_verbose++;
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break;
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case 'n':
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/* no nowrite option at this moment */
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/* opt_nowrite = 1; */
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break;
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case 'c':
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opt_safe = 1;
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break;
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case 'q':
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opt_verbose = 0;
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break;
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case 'k':
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opt_skipj = 1;
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break;
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case 'V':
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opt_banner++;
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break;
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default:
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print_usage_and_exit();
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}
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}
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print_banner(g_progname);
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if (opt_banner)
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exit(0);
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devname = argv[optind];
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fs = reiserfs_open(devname, O_RDONLY, &error, 0, 1);
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if (!fs) {
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if (error) {
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reiserfs_exit(1, "cannot open '%s': %s",
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devname, strerror(error));
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} else {
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exit(1);
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}
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}
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if (reiserfs_open_journal(fs, jdevice_name, O_RDWR | O_LARGEFILE)) {
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reiserfs_exit(1, "Failed to open the journal device (%s).",
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jdevice_name);
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}
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if (reiserfs_journal_params_check(fs)) {
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if (!opt_skipj) {
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reiserfs_exit(1,
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"Wrong journal parameters detected on (%s)",
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jdevice_name);
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} else {
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reiserfs_close_journal(fs);
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}
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}
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/* forced to continue without journal available/specified */
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if (no_reiserfs_found(fs)) {
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reiserfs_exit(1, "no reiserfs found on the device.");
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}
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if (!spread_bitmaps(fs)) {
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reiserfs_exit(1, "cannot resize reiserfs in old (not spread "
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"bitmap) format.");
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}
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sb = fs->fs_ondisk_sb;
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/* If size change was specified by user, calculate it,
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otherwise take the whole device. */
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block_count_new = bytes_count_str ?
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calc_new_fs_size(get_sb_block_count(sb),
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fs->fs_blocksize, bytes_count_str) :
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count_blocks(devname, fs->fs_blocksize);
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if (resizer_check_fs_size(fs, block_count_new))
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return 1;
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if (misc_device_mounted(devname) > 0) {
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reiserfs_close(fs);
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error = resize_fs_online(devname, block_count_new);
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reiserfs_warning(stderr,
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"\n\nresize_reiserfs: On-line resizing %s.\n\n",
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error ? "failed" : "finished successfully");
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return error;
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}
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if (!reiserfs_is_fs_consistent(fs)) {
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reiserfs_warning(stderr,
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"\n\nresize_reiserfs: run reiserfsck --check "
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"first\n\n");
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reiserfs_close(fs);
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return 1;
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}
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if (get_sb_umount_state(sb) != FS_CLEANLY_UMOUNTED)
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/* fixme: shouldn't we check for something like: fsck guarantees: fs is ok */
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reiserfs_exit(1, "the file system isn't in valid state.");
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/* Needed to keep idiot compiler from issuing false warning */
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sb_old = 0;
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/* save SB for reporting */
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if (opt_verbose) {
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sb_old = getmem(SB_SIZE);
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memcpy(sb_old, fs->fs_ondisk_sb, SB_SIZE);
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}
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error = (block_count_new > get_sb_block_count(fs->fs_ondisk_sb)) ?
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expand_fs(fs, block_count_new) : shrink_fs(fs, block_count_new);
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if (error) {
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reiserfs_warning(stderr,
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"\n\nresize_reiserfs: Resizing failed.\n\n ");
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return error;
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}
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if (opt_verbose) {
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sb_report(fs->fs_ondisk_sb, sb_old);
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freemem(sb_old);
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}
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set_sb_fs_state(fs->fs_ondisk_sb, FS_CONSISTENT);
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bwrite_cond(fs->fs_super_bh);
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if (opt_verbose) {
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printf("\nSyncing..");
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fflush(stdout);
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}
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reiserfs_close(fs);
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if (opt_verbose)
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printf("done\n");
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reiserfs_warning(stderr, "\n\nresize_reiserfs: Resizing finished "
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"successfully.\n\n ");
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return 0;
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}
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