/*
* This function reserves the superblock and block group descriptors
* for a given block group. It currently returns the number of free
* blocks assuming that inode table and allocation bitmaps will be in
* the group. This is not necessarily the case when the flex_bg
* feature is enabled, so callers should take care! It was only
* really intended for use by mke2fs, and even there it's not that
* useful. In the future, when we redo this function for 64-bit block
* numbers, we should probably return the number of blocks used by the
* super block and group descriptors instead.
*
* See also the comment for ext2fs_super_and_bgd_loc()
*/
int ext2fs_reserve_super_and_bgd(ext2_filsys fs,
dgrp_t group,
ext2fs_block_bitmap bmap)
{
blk64_t super_blk, old_desc_blk, new_desc_blk;
blk_t used_blks;
int j, old_desc_blocks, num_blocks;
ext2fs_super_and_bgd_loc2(fs, group, &super_blk,
&old_desc_blk, &new_desc_blk, &used_blks);
if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
old_desc_blocks = fs->super->s_first_meta_bg;
else
old_desc_blocks =
fs->desc_blocks + fs->super->s_reserved_gdt_blocks;
if (super_blk || (group == 0))
ext2fs_mark_block_bitmap2(bmap, super_blk);
if ((group == 0) && (fs->blocksize == 1024) &&
EXT2FS_CLUSTER_RATIO(fs) > 1)
ext2fs_mark_block_bitmap2(bmap, 0);
if (old_desc_blk) {
if (fs->super->s_reserved_gdt_blocks && fs->block_map == bmap)
ext2fs_bg_flags_clear(fs, group, EXT2_BG_BLOCK_UNINIT);
for (j=0; j < old_desc_blocks; j++)
if (old_desc_blk + j < ext2fs_blocks_count(fs->super))
ext2fs_mark_block_bitmap2(bmap,
old_desc_blk + j);
}
if (new_desc_blk)
ext2fs_mark_block_bitmap2(bmap, new_desc_blk);
num_blocks = ext2fs_group_blocks_count(fs, group);
num_blocks -= 2 + fs->inode_blocks_per_group + used_blks;
return num_blocks ;
}
/*
* This function returns the location of the superblock, block group
* descriptors for a given block group. It currently returns the
* number of free blocks assuming that inode table and allocation
* bitmaps will be in the group. This is not necessarily the case
* when the flex_bg feature is enabled, so callers should take care!
* It was only really intended for use by mke2fs, and even there it's
* not that useful.
*
* The ext2fs_super_and_bgd_loc2() function is 64-bit block number
* capable and returns the number of blocks used by super block and
* group descriptors.
*/
int ext2fs_super_and_bgd_loc(ext2_filsys fs,
dgrp_t group,
blk_t *ret_super_blk,
blk_t *ret_old_desc_blk,
blk_t *ret_new_desc_blk,
int *ret_meta_bg)
{
blk64_t ret_super_blk2;
blk64_t ret_old_desc_blk2;
blk64_t ret_new_desc_blk2;
blk_t ret_used_blks;
blk_t numblocks;
unsigned int meta_bg_size;
ext2fs_super_and_bgd_loc2(fs, group, &ret_super_blk2,
&ret_old_desc_blk2,
&ret_new_desc_blk2,
&ret_used_blks);
numblocks = ext2fs_group_blocks_count(fs, group);
if (ret_super_blk)
*ret_super_blk = (blk_t)ret_super_blk2;
if (ret_old_desc_blk)
*ret_old_desc_blk = (blk_t)ret_old_desc_blk2;
if (ret_new_desc_blk)
*ret_new_desc_blk = (blk_t)ret_new_desc_blk2;
if (ret_meta_bg) {
meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
*ret_meta_bg = group / meta_bg_size;
}
numblocks -= 2 + fs->inode_blocks_per_group + ret_used_blks;
return numblocks;
}
errcode_t online_resize_fs(ext2_filsys fs, const char *mtpt,
blk64_t *new_size, int flags EXT2FS_ATTR((unused)))
{
#ifdef __linux__
struct ext2_new_group_input input;
struct ext4_new_group_input input64;
struct ext2_super_block *sb = fs->super;
unsigned long new_desc_blocks;
ext2_filsys new_fs;
errcode_t retval;
double percent;
dgrp_t i;
blk_t size;
int fd, overhead;
int use_old_ioctl = 1;
int no_meta_bg_resize = 0;
int no_resize_ioctl = 0;
if (getenv("RESIZE2FS_KERNEL_VERSION")) {
char *version_to_emulate = getenv("RESIZE2FS_KERNEL_VERSION");
int kvers = parse_version_number(version_to_emulate);
if (kvers < VERSION_CODE(3, 7, 0))
no_meta_bg_resize = 1;
if (kvers < VERSION_CODE(3, 3, 0))
no_resize_ioctl = 1;
}
if (ext2fs_has_feature_sparse_super2(fs->super) &&
(access("/sys/fs/ext4/features/sparse_super2", R_OK) != 0)) {
com_err(program_name, 0, _("kernel does not support online "
"resize with sparse_super2"));
exit(1);
}
printf(_("Filesystem at %s is mounted on %s; "
"on-line resizing required\n"), fs->device_name, mtpt);
if (*new_size < ext2fs_blocks_count(sb)) {
com_err(program_name, 0, _("On-line shrinking not supported"));
exit(1);
}
/*
* If the number of descriptor blocks is going to increase,
* the on-line resizing inode must be present.
*/
new_desc_blocks = ext2fs_div_ceil(
ext2fs_div64_ceil(*new_size -
fs->super->s_first_data_block,
EXT2_BLOCKS_PER_GROUP(fs->super)),
EXT2_DESC_PER_BLOCK(fs->super));
printf("old_desc_blocks = %lu, new_desc_blocks = %lu\n",
fs->desc_blocks, new_desc_blocks);
/*
* Do error checking to make sure the resize will be successful.
*/
if ((access("/sys/fs/ext4/features/meta_bg_resize", R_OK) != 0) ||
no_meta_bg_resize) {
if (!ext2fs_has_feature_resize_inode(fs->super) &&
(new_desc_blocks != fs->desc_blocks)) {
com_err(program_name, 0,
_("Filesystem does not support online resizing"));
exit(1);
}
if (ext2fs_has_feature_resize_inode(fs->super) &&
new_desc_blocks > (fs->desc_blocks +
fs->super->s_reserved_gdt_blocks)) {
com_err(program_name, 0,
_("Not enough reserved gdt blocks for resizing"));
exit(1);
}
if ((ext2fs_blocks_count(sb) > MAX_32_NUM) ||
(*new_size > MAX_32_NUM)) {
com_err(program_name, 0,
_("Kernel does not support resizing a file system this large"));
exit(1);
}
}
fd = open(mtpt, O_RDONLY);
if (fd < 0) {
com_err(program_name, errno,
_("while trying to open mountpoint %s"), mtpt);
exit(1);
}
if (no_resize_ioctl) {
printf(_("Old resize interface requested.\n"));
} else if (ioctl(fd, EXT4_IOC_RESIZE_FS, new_size)) {
/*
* If kernel does not support EXT4_IOC_RESIZE_FS, use the
* old online resize. Note that the old approach does not
* handle >32 bit file systems
*
* Sigh, if we are running a 32-bit binary on a 64-bit
* kernel (which happens all the time on the MIPS
* architecture in Debian, but can happen on other CPU
* architectures as well) we will get EINVAL returned
* when an ioctl doesn't exist, at least up to Linux
* 3.1. See compat_sys_ioctl() in fs/compat_ioctl.c
* in the kernel sources. This is probably a kernel
* bug, but work around it here.
*/
if ((errno != ENOTTY) && (errno != EINVAL)) {
if (errno == EPERM)
com_err(program_name, 0,
_("Permission denied to resize filesystem"));
else
com_err(program_name, errno,
_("While checking for on-line resizing "
"support"));
exit(1);
}
} else {
close(fd);
return 0;
}
size = ext2fs_blocks_count(sb);
if (ioctl(fd, EXT2_IOC_GROUP_EXTEND, &size)) {
if (errno == EPERM)
com_err(program_name, 0,
_("Permission denied to resize filesystem"));
else if (errno == ENOTTY)
com_err(program_name, 0,
_("Kernel does not support online resizing"));
else
com_err(program_name, errno,
_("While checking for on-line resizing support"));
exit(1);
}
percent = (ext2fs_r_blocks_count(sb) * 100.0) /
ext2fs_blocks_count(sb);
retval = ext2fs_read_bitmaps(fs);
if (retval) {
close(fd);
return retval;
}
retval = ext2fs_dup_handle(fs, &new_fs);
if (retval) {
close(fd);
return retval;
}
/* The current method of adding one block group at a time to a
* mounted filesystem means it is impossible to accommodate the
* flex_bg allocation method of placing the metadata together
* in a single block group. For now we "fix" this issue by
* using the traditional layout for new block groups, where
* each block group is self-contained and contains its own
* bitmap blocks and inode tables. This means we don't get
* the layout advantages of flex_bg in the new block groups,
* but at least it allows on-line resizing to function.
*/
ext2fs_clear_feature_flex_bg(new_fs->super);
retval = adjust_fs_info(new_fs, fs, 0, *new_size);
if (retval) {
close(fd);
return retval;
}
printf(_("Performing an on-line resize of %s to %llu (%dk) blocks.\n"),
fs->device_name, *new_size, fs->blocksize / 1024);
size = fs->group_desc_count * sb->s_blocks_per_group +
sb->s_first_data_block;
if (size > *new_size)
size = *new_size;
if (ioctl(fd, EXT2_IOC_GROUP_EXTEND, &size)) {
com_err(program_name, errno,
_("While trying to extend the last group"));
exit(1);
}
for (i = fs->group_desc_count;
i < new_fs->group_desc_count; i++) {
overhead = (int) (2 + new_fs->inode_blocks_per_group);
if (ext2fs_bg_has_super(new_fs, new_fs->group_desc_count - 1))
overhead += 1 + new_fs->desc_blocks +
new_fs->super->s_reserved_gdt_blocks;
input.group = i;
input.block_bitmap = ext2fs_block_bitmap_loc(new_fs, i);
input.inode_bitmap = ext2fs_inode_bitmap_loc(new_fs, i);
input.inode_table = ext2fs_inode_table_loc(new_fs, i);
input.blocks_count = ext2fs_group_blocks_count(new_fs, i);
input.reserved_blocks = (blk_t) (percent * input.blocks_count
/ 100.0);
#if 0
printf("new block bitmap is at 0x%04x\n", input.block_bitmap);
printf("new inode bitmap is at 0x%04x\n", input.inode_bitmap);
printf("new inode table is at 0x%04x-0x%04x\n",
input.inode_table,
input.inode_table + new_fs->inode_blocks_per_group-1);
printf("new group has %u blocks\n", input.blocks_count);
printf("new group will reserve %d blocks\n",
input.reserved_blocks);
printf("new group has %d free blocks\n",
ext2fs_bg_free_blocks_count(new_fs, i),
printf("new group has %d free inodes (%d blocks)\n",
ext2fs_bg_free_inodes_count(new_fs, i),
new_fs->inode_blocks_per_group);
printf("Adding group #%d\n", input.group);
#endif
if (use_old_ioctl &&
ioctl(fd, EXT2_IOC_GROUP_ADD, &input) == 0)
continue;
else
use_old_ioctl = 0;
input64.group = input.group;
input64.block_bitmap = input.block_bitmap;
input64.inode_bitmap = input.inode_bitmap;
input64.inode_table = input.inode_table;
input64.blocks_count = input.blocks_count;
input64.reserved_blocks = input.reserved_blocks;
input64.unused = input.unused;
if (ioctl(fd, EXT4_IOC_GROUP_ADD, &input64) < 0) {
com_err(program_name, errno,
_("While trying to add group #%d"),
input.group);
exit(1);
}
}
ext2fs_free(new_fs);
close(fd);
return 0;
#else
printf(_("Filesystem at %s is mounted on %s, and on-line resizing is "
"not supported on this system.\n"), fs->device_name, mtpt);
exit(1);
#endif
}
static void check_block_bitmaps(e2fsck_t ctx)
{
ext2_filsys fs = ctx->fs;
blk64_t i;
unsigned int *free_array;
int group = 0;
unsigned int blocks = 0;
blk64_t free_blocks = 0;
blk64_t first_free = ext2fs_blocks_count(fs->super);
unsigned int group_free = 0;
int actual, bitmap;
struct problem_context pctx;
int problem, save_problem, fixit, had_problem;
errcode_t retval;
int csum_flag;
int skip_group = 0;
int old_desc_blocks = 0;
int count = 0;
int cmp_block = 0;
int redo_flag = 0;
blk64_t super_blk, old_desc_blk, new_desc_blk;
clear_problem_context(&pctx);
free_array = (unsigned int *) e2fsck_allocate_memory(ctx,
fs->group_desc_count * sizeof(unsigned int), "free block count array");
if ((B2C(fs->super->s_first_data_block) <
ext2fs_get_block_bitmap_start2(ctx->block_found_map)) ||
(B2C(ext2fs_blocks_count(fs->super)-1) >
ext2fs_get_block_bitmap_end2(ctx->block_found_map))) {
pctx.num = 1;
pctx.blk = B2C(fs->super->s_first_data_block);
pctx.blk2 = B2C(ext2fs_blocks_count(fs->super) - 1);
pctx.ino = ext2fs_get_block_bitmap_start2(ctx->block_found_map);
pctx.ino2 = ext2fs_get_block_bitmap_end2(ctx->block_found_map);
fix_problem(ctx, PR_5_BMAP_ENDPOINTS, &pctx);
ctx->flags |= E2F_FLAG_ABORT; /* fatal */
goto errout;
}
if ((B2C(fs->super->s_first_data_block) <
ext2fs_get_block_bitmap_start2(fs->block_map)) ||
(B2C(ext2fs_blocks_count(fs->super)-1) >
ext2fs_get_block_bitmap_end2(fs->block_map))) {
pctx.num = 2;
pctx.blk = B2C(fs->super->s_first_data_block);
pctx.blk2 = B2C(ext2fs_blocks_count(fs->super) - 1);
pctx.ino = ext2fs_get_block_bitmap_start2(fs->block_map);
pctx.ino2 = ext2fs_get_block_bitmap_end2(fs->block_map);
fix_problem(ctx, PR_5_BMAP_ENDPOINTS, &pctx);
ctx->flags |= E2F_FLAG_ABORT; /* fatal */
goto errout;
}
csum_flag = EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
EXT4_FEATURE_RO_COMPAT_GDT_CSUM);
redo_counts:
had_problem = 0;
save_problem = 0;
pctx.blk = pctx.blk2 = NO_BLK;
if (csum_flag &&
(ext2fs_bg_flags_test(fs, group, EXT2_BG_BLOCK_UNINIT)))
skip_group++;
for (i = B2C(fs->super->s_first_data_block);
i < ext2fs_blocks_count(fs->super);
i += EXT2FS_CLUSTER_RATIO(fs)) {
actual = ext2fs_fast_test_block_bitmap2(ctx->block_found_map, i);
if (skip_group) {
if ((B2C(i) - B2C(fs->super->s_first_data_block)) %
fs->super->s_clusters_per_group == 0) {
super_blk = 0;
old_desc_blk = 0;
new_desc_blk = 0;
ext2fs_super_and_bgd_loc2(fs, group, &super_blk,
&old_desc_blk, &new_desc_blk, 0);
if (fs->super->s_feature_incompat &
EXT2_FEATURE_INCOMPAT_META_BG)
old_desc_blocks =
fs->super->s_first_meta_bg;
else
old_desc_blocks = fs->desc_blocks +
fs->super->s_reserved_gdt_blocks;
count = 0;
cmp_block = fs->super->s_clusters_per_group;
if (group == (int)fs->group_desc_count - 1)
cmp_block = EXT2FS_NUM_B2C(fs,
ext2fs_group_blocks_count(fs, group));
}
bitmap = 0;
if (EQ_CLSTR(i, super_blk) ||
(old_desc_blk && old_desc_blocks &&
GE_CLSTR(i, old_desc_blk) &&
LE_CLSTR(i, old_desc_blk + old_desc_blocks-1)) ||
(new_desc_blk && EQ_CLSTR(i, new_desc_blk)) ||
EQ_CLSTR(i, ext2fs_block_bitmap_loc(fs, group)) ||
EQ_CLSTR(i, ext2fs_inode_bitmap_loc(fs, group)) ||
(GE_CLSTR(i, ext2fs_inode_table_loc(fs, group)) &&
LE_CLSTR(i, (ext2fs_inode_table_loc(fs, group) +
fs->inode_blocks_per_group - 1)))) {
bitmap = 1;
actual = (actual != 0);
count++;
cmp_block--;
} else if ((EXT2FS_B2C(fs, i) - count -
EXT2FS_B2C(fs, fs->super->s_first_data_block)) %
fs->super->s_clusters_per_group == 0) {
/*
* When the compare data blocks in block bitmap
* are 0, count the free block,
* skip the current block group.
*/
if (ext2fs_test_block_bitmap_range2(
ctx->block_found_map,
EXT2FS_B2C(fs, i),
cmp_block)) {
/*
* -1 means to skip the current block
* group.
*/
blocks = fs->super->s_clusters_per_group - 1;
group_free = cmp_block;
free_blocks += cmp_block;
/*
* The current block group's last block
* is set to i.
*/
i += EXT2FS_C2B(fs, cmp_block - 1);
bitmap = 1;
goto do_counts;
}
}
} else if (redo_flag)
bitmap = actual;
else
bitmap = ext2fs_fast_test_block_bitmap2(fs->block_map, i);
if (!actual == !bitmap)
goto do_counts;
if (!actual && bitmap) {
/*
* Block not used, but marked in use in the bitmap.
*/
problem = PR_5_BLOCK_UNUSED;
} else {
/*
* Block used, but not marked in use in the bitmap.
*/
problem = PR_5_BLOCK_USED;
if (skip_group) {
struct problem_context pctx2;
pctx2.blk = i;
pctx2.group = group;
if (fix_problem(ctx, PR_5_BLOCK_UNINIT,&pctx2)){
ext2fs_bg_flags_clear(fs, group, EXT2_BG_BLOCK_UNINIT);
skip_group = 0;
}
}
}
if (pctx.blk == NO_BLK) {
pctx.blk = pctx.blk2 = i;
save_problem = problem;
} else {
if ((problem == save_problem) &&
(pctx.blk2 == i-1))
pctx.blk2++;
else {
print_bitmap_problem(ctx, save_problem, &pctx);
pctx.blk = pctx.blk2 = i;
save_problem = problem;
}
}
ctx->flags |= E2F_FLAG_PROG_SUPPRESS;
had_problem++;
/*
* If there a problem we should turn off the discard so we
* do not compromise the filesystem.
*/
ctx->options &= ~E2F_OPT_DISCARD;
do_counts:
if (!bitmap) {
group_free++;
free_blocks++;
if (first_free > i)
first_free = i;
} else if (i > first_free) {
e2fsck_discard_blocks(ctx, first_free,
(i - first_free));
first_free = ext2fs_blocks_count(fs->super);
}
blocks ++;
if ((blocks == fs->super->s_clusters_per_group) ||
(EXT2FS_B2C(fs, i) ==
EXT2FS_B2C(fs, ext2fs_blocks_count(fs->super)-1))) {
/*
* If the last block of this group is free, then we can
* discard it as well.
*/
if (!bitmap && i >= first_free)
e2fsck_discard_blocks(ctx, first_free,
(i - first_free) + 1);
first_free = ext2fs_blocks_count(fs->super);
free_array[group] = group_free;
group ++;
blocks = 0;
group_free = 0;
skip_group = 0;
if (ctx->progress)
if ((ctx->progress)(ctx, 5, group,
fs->group_desc_count*2))
goto errout;
if (csum_flag &&
(i != ext2fs_blocks_count(fs->super)-1) &&
ext2fs_bg_flags_test(fs, group,
EXT2_BG_BLOCK_UNINIT))
skip_group++;
}
}
if (pctx.blk != NO_BLK)
print_bitmap_problem(ctx, save_problem, &pctx);
if (had_problem)
fixit = end_problem_latch(ctx, PR_LATCH_BBITMAP);
else
fixit = -1;
ctx->flags &= ~E2F_FLAG_PROG_SUPPRESS;
if (fixit == 1) {
ext2fs_free_block_bitmap(fs->block_map);
retval = ext2fs_copy_bitmap(ctx->block_found_map,
&fs->block_map);
if (retval) {
clear_problem_context(&pctx);
fix_problem(ctx, PR_5_COPY_BBITMAP_ERROR, &pctx);
ctx->flags |= E2F_FLAG_ABORT;
goto errout;
}
ext2fs_set_bitmap_padding(fs->block_map);
ext2fs_mark_bb_dirty(fs);
/* Redo the counts */
blocks = 0; free_blocks = 0; group_free = 0; group = 0;
memset(free_array, 0, fs->group_desc_count * sizeof(int));
redo_flag++;
goto redo_counts;
} else if (fixit == 0)
ext2fs_unmark_valid(fs);
for (i = 0; i < fs->group_desc_count; i++) {
if (free_array[i] != ext2fs_bg_free_blocks_count(fs, i)) {
pctx.group = i;
pctx.blk = ext2fs_bg_free_blocks_count(fs, i);
pctx.blk2 = free_array[i];
if (fix_problem(ctx, PR_5_FREE_BLOCK_COUNT_GROUP,
&pctx)) {
ext2fs_bg_free_blocks_count_set(fs, i, free_array[i]);
ext2fs_mark_super_dirty(fs);
} else
ext2fs_unmark_valid(fs);
}
}
free_blocks = EXT2FS_C2B(fs, free_blocks);
if (free_blocks != ext2fs_free_blocks_count(fs->super)) {
pctx.group = 0;
pctx.blk = ext2fs_free_blocks_count(fs->super);
pctx.blk2 = free_blocks;
if (fix_problem(ctx, PR_5_FREE_BLOCK_COUNT, &pctx)) {
ext2fs_free_blocks_count_set(fs->super, free_blocks);
ext2fs_mark_super_dirty(fs);
}
}
errout:
ext2fs_free_mem(&free_array);
}
