errcode_t ext2fs_initialize(const char *name, int flags,
struct ext2_super_block *param,
io_manager manager, ext2_filsys *ret_fs)
{
ext2_filsys fs;
errcode_t retval;
struct ext2_super_block *super;
unsigned int rem;
unsigned int overhead = 0;
unsigned int ipg;
dgrp_t i;
blk64_t free_blocks;
blk_t numblocks;
int rsv_gdt;
int csum_flag;
int bigalloc_flag;
int io_flags;
unsigned reserved_inos;
char *buf = 0;
char c;
double reserved_ratio;
if (!param || !ext2fs_blocks_count(param))
return EXT2_ET_INVALID_ARGUMENT;
retval = ext2fs_get_mem(sizeof(struct struct_ext2_filsys), &fs);
if (retval)
return retval;
memset(fs, 0, sizeof(struct struct_ext2_filsys));
fs->magic = EXT2_ET_MAGIC_EXT2FS_FILSYS;
fs->flags = flags | EXT2_FLAG_RW;
fs->umask = 022;
fs->default_bitmap_type = EXT2FS_BMAP64_RBTREE;
#ifdef WORDS_BIGENDIAN
fs->flags |= EXT2_FLAG_SWAP_BYTES;
#endif
io_flags = IO_FLAG_RW;
if (flags & EXT2_FLAG_EXCLUSIVE)
io_flags |= IO_FLAG_EXCLUSIVE;
if (flags & EXT2_FLAG_DIRECT_IO)
io_flags |= IO_FLAG_DIRECT_IO;
retval = manager->open(name, io_flags, &fs->io);
if (retval)
goto cleanup;
fs->image_io = fs->io;
fs->io->app_data = fs;
retval = ext2fs_get_mem(strlen(name)+1, &fs->device_name);
if (retval)
goto cleanup;
strcpy(fs->device_name, name);
retval = ext2fs_get_mem(SUPERBLOCK_SIZE, &super);
if (retval)
goto cleanup;
fs->super = super;
memset(super, 0, SUPERBLOCK_SIZE);
#define set_field(field, default) (super->field = param->field ? \
param->field : (default))
#define assign_field(field) (super->field = param->field)
super->s_magic = EXT2_SUPER_MAGIC;
super->s_state = EXT2_VALID_FS;
bigalloc_flag = EXT2_HAS_RO_COMPAT_FEATURE(param,
EXT4_FEATURE_RO_COMPAT_BIGALLOC);
assign_field(s_log_block_size);
if (bigalloc_flag) {
set_field(s_log_cluster_size, super->s_log_block_size+4);
if (super->s_log_block_size > super->s_log_cluster_size) {
retval = EXT2_ET_INVALID_ARGUMENT;
goto cleanup;
}
} else
super->s_log_cluster_size = super->s_log_block_size;
set_field(s_first_data_block, super->s_log_cluster_size ? 0 : 1);
set_field(s_max_mnt_count, 0);
set_field(s_errors, EXT2_ERRORS_DEFAULT);
set_field(s_feature_compat, 0);
set_field(s_feature_incompat, 0);
set_field(s_feature_ro_compat, 0);
set_field(s_default_mount_opts, 0);
set_field(s_first_meta_bg, 0);
set_field(s_raid_stride, 0); /* default stride size: 0 */
set_field(s_raid_stripe_width, 0); /* default stripe width: 0 */
set_field(s_log_groups_per_flex, 0);
set_field(s_flags, 0);
assign_field(s_backup_bgs[0]);
assign_field(s_backup_bgs[1]);
if (super->s_feature_incompat & ~EXT2_LIB_FEATURE_INCOMPAT_SUPP) {
retval = EXT2_ET_UNSUPP_FEATURE;
goto cleanup;
}
if (super->s_feature_ro_compat & ~EXT2_LIB_FEATURE_RO_COMPAT_SUPP) {
retval = EXT2_ET_RO_UNSUPP_FEATURE;
goto cleanup;
}
set_field(s_rev_level, EXT2_GOOD_OLD_REV);
if (super->s_rev_level >= EXT2_DYNAMIC_REV) {
set_field(s_first_ino, EXT2_GOOD_OLD_FIRST_INO);
set_field(s_inode_size, EXT2_GOOD_OLD_INODE_SIZE);
if (super->s_inode_size >= sizeof(struct ext2_inode_large)) {
int extra_isize = sizeof(struct ext2_inode_large) -
EXT2_GOOD_OLD_INODE_SIZE;
set_field(s_min_extra_isize, extra_isize);
set_field(s_want_extra_isize, extra_isize);
}
} else {
super->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
super->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
}
set_field(s_checkinterval, 0);
super->s_mkfs_time = super->s_lastcheck = fs->now ? fs->now : time(NULL);
super->s_creator_os = CREATOR_OS;
fs->fragsize = fs->blocksize = EXT2_BLOCK_SIZE(super);
fs->cluster_ratio_bits = super->s_log_cluster_size -
super->s_log_block_size;
if (bigalloc_flag) {
unsigned long long bpg;
if (param->s_blocks_per_group &&
param->s_clusters_per_group &&
((param->s_clusters_per_group * EXT2FS_CLUSTER_RATIO(fs)) !=
param->s_blocks_per_group)) {
retval = EXT2_ET_INVALID_ARGUMENT;
goto cleanup;
}
if (param->s_clusters_per_group)
assign_field(s_clusters_per_group);
else if (param->s_blocks_per_group)
super->s_clusters_per_group =
param->s_blocks_per_group /
EXT2FS_CLUSTER_RATIO(fs);
else if (super->s_log_cluster_size + 15 < 32)
super->s_clusters_per_group = fs->blocksize * 8;
else
super->s_clusters_per_group = (fs->blocksize - 1) * 8;
if (super->s_clusters_per_group > EXT2_MAX_CLUSTERS_PER_GROUP(super))
super->s_clusters_per_group = EXT2_MAX_CLUSTERS_PER_GROUP(super);
bpg = EXT2FS_C2B(fs,
(unsigned long long) super->s_clusters_per_group);
if (bpg >= (((unsigned long long) 1) << 32)) {
retval = EXT2_ET_INVALID_ARGUMENT;
goto cleanup;
}
super->s_blocks_per_group = bpg;
} else {
set_field(s_blocks_per_group, fs->blocksize * 8);
if (super->s_blocks_per_group > EXT2_MAX_BLOCKS_PER_GROUP(super))
super->s_blocks_per_group = EXT2_MAX_BLOCKS_PER_GROUP(super);
super->s_clusters_per_group = super->s_blocks_per_group;
}
ext2fs_blocks_count_set(super, ext2fs_blocks_count(param) &
~((blk64_t) EXT2FS_CLUSTER_MASK(fs)));
ext2fs_r_blocks_count_set(super, ext2fs_r_blocks_count(param));
if (ext2fs_r_blocks_count(super) >= ext2fs_blocks_count(param)) {
retval = EXT2_ET_INVALID_ARGUMENT;
goto cleanup;
}
set_field(s_mmp_update_interval, 0);
/*
* If we're creating an external journal device, we don't need
* to bother with the rest.
*/
if (super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) {
fs->group_desc_count = 0;
ext2fs_mark_super_dirty(fs);
*ret_fs = fs;
return 0;
}
retry:
fs->group_desc_count = (dgrp_t) ext2fs_div64_ceil(
ext2fs_blocks_count(super) - super->s_first_data_block,
EXT2_BLOCKS_PER_GROUP(super));
if (fs->group_desc_count == 0) {
retval = EXT2_ET_TOOSMALL;
goto cleanup;
}
set_field(s_desc_size,
super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT ?
EXT2_MIN_DESC_SIZE_64BIT : 0);
fs->desc_blocks = ext2fs_div_ceil(fs->group_desc_count,
EXT2_DESC_PER_BLOCK(super));
i = fs->blocksize >= 4096 ? 1 : 4096 / fs->blocksize;
if (super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT &&
(ext2fs_blocks_count(super) / i) > (1ULL << 32))
set_field(s_inodes_count, ~0U);
else
set_field(s_inodes_count, ext2fs_blocks_count(super) / i);
/*
* Make sure we have at least EXT2_FIRST_INO + 1 inodes, so
* that we have enough inodes for the filesystem(!)
*/
if (super->s_inodes_count < EXT2_FIRST_INODE(super)+1)
super->s_inodes_count = EXT2_FIRST_INODE(super)+1;
/*
* There should be at least as many inodes as the user
* requested. Figure out how many inodes per group that
* should be. But make sure that we don't allocate more than
* one bitmap's worth of inodes each group.
*/
ipg = ext2fs_div_ceil(super->s_inodes_count, fs->group_desc_count);
if (ipg > fs->blocksize * 8) {
if (!bigalloc_flag && super->s_blocks_per_group >= 256) {
/* Try again with slightly different parameters */
super->s_blocks_per_group -= 8;
ext2fs_blocks_count_set(super,
ext2fs_blocks_count(param));
super->s_clusters_per_group = super->s_blocks_per_group;
goto retry;
} else {
retval = EXT2_ET_TOO_MANY_INODES;
goto cleanup;
}
}
if (ipg > (unsigned) EXT2_MAX_INODES_PER_GROUP(super))
ipg = EXT2_MAX_INODES_PER_GROUP(super);
ipg_retry:
super->s_inodes_per_group = ipg;
/*
* Make sure the number of inodes per group completely fills
* the inode table blocks in the descriptor. If not, add some
* additional inodes/group. Waste not, want not...
*/
fs->inode_blocks_per_group = (((super->s_inodes_per_group *
EXT2_INODE_SIZE(super)) +
EXT2_BLOCK_SIZE(super) - 1) /
EXT2_BLOCK_SIZE(super));
super->s_inodes_per_group = ((fs->inode_blocks_per_group *
EXT2_BLOCK_SIZE(super)) /
EXT2_INODE_SIZE(super));
/*
* Finally, make sure the number of inodes per group is a
* multiple of 8. This is needed to simplify the bitmap
* splicing code.
*/
if (super->s_inodes_per_group < 8)
super->s_inodes_per_group = 8;
super->s_inodes_per_group &= ~7;
fs->inode_blocks_per_group = (((super->s_inodes_per_group *
EXT2_INODE_SIZE(super)) +
EXT2_BLOCK_SIZE(super) - 1) /
EXT2_BLOCK_SIZE(super));
/*
* adjust inode count to reflect the adjusted inodes_per_group
*/
if ((__u64)super->s_inodes_per_group * fs->group_desc_count > ~0U) {
ipg--;
goto ipg_retry;
}
super->s_inodes_count = super->s_inodes_per_group *
fs->group_desc_count;
super->s_free_inodes_count = super->s_inodes_count;
/*
* check the number of reserved group descriptor table blocks
*/
if (super->s_feature_compat & EXT2_FEATURE_COMPAT_RESIZE_INODE)
rsv_gdt = calc_reserved_gdt_blocks(fs);
else
rsv_gdt = 0;
set_field(s_reserved_gdt_blocks, rsv_gdt);
if (super->s_reserved_gdt_blocks > EXT2_ADDR_PER_BLOCK(super)) {
retval = EXT2_ET_RES_GDT_BLOCKS;
goto cleanup;
}
/*
* Calculate the maximum number of bookkeeping blocks per
* group. It includes the superblock, the block group
* descriptors, the block bitmap, the inode bitmap, the inode
* table, and the reserved gdt blocks.
*/
overhead = (int) (3 + fs->inode_blocks_per_group +
fs->desc_blocks + super->s_reserved_gdt_blocks);
/* This can only happen if the user requested too many inodes */
if (overhead > super->s_blocks_per_group) {
retval = EXT2_ET_TOO_MANY_INODES;
goto cleanup;
}
/*
* See if the last group is big enough to support the
* necessary data structures. If not, we need to get rid of
* it. We need to recalculate the overhead for the last block
* group, since it might or might not have a superblock
* backup.
*/
overhead = (int) (2 + fs->inode_blocks_per_group);
if (ext2fs_bg_has_super(fs, fs->group_desc_count - 1))
overhead += 1 + fs->desc_blocks + super->s_reserved_gdt_blocks;
rem = ((ext2fs_blocks_count(super) - super->s_first_data_block) %
super->s_blocks_per_group);
if ((fs->group_desc_count == 1) && rem && (rem < overhead)) {
retval = EXT2_ET_TOOSMALL;
goto cleanup;
}
if (rem && (rem < overhead+50)) {
ext2fs_blocks_count_set(super, ext2fs_blocks_count(super) -
rem);
/*
* If blocks count is changed, we need to recalculate
* reserved blocks count not to exceed 50%.
*/
reserved_ratio = 100.0 * ext2fs_r_blocks_count(param) /
ext2fs_blocks_count(param);
ext2fs_r_blocks_count_set(super, reserved_ratio *
ext2fs_blocks_count(super) / 100.0);
goto retry;
}
/*
* At this point we know how big the filesystem will be. So
* we can do any and all allocations that depend on the block
* count.
*/
/* Set up the locations of the backup superblocks */
if (super->s_feature_compat & EXT4_FEATURE_COMPAT_SPARSE_SUPER2) {
if (super->s_backup_bgs[0] >= fs->group_desc_count)
super->s_backup_bgs[0] = fs->group_desc_count - 1;
if (super->s_backup_bgs[1] >= fs->group_desc_count)
super->s_backup_bgs[1] = fs->group_desc_count - 1;
if (super->s_backup_bgs[0] == super->s_backup_bgs[1])
super->s_backup_bgs[1] = 0;
if (super->s_backup_bgs[0] > super->s_backup_bgs[1]) {
__u32 t = super->s_backup_bgs[0];
super->s_backup_bgs[0] = super->s_backup_bgs[1];
super->s_backup_bgs[1] = t;
}
}
retval = ext2fs_get_mem(strlen(fs->device_name) + 80, &buf);
if (retval)
goto cleanup;
strcpy(buf, "block bitmap for ");
strcat(buf, fs->device_name);
retval = ext2fs_allocate_subcluster_bitmap(fs, buf, &fs->block_map);
if (retval)
goto cleanup;
strcpy(buf, "inode bitmap for ");
strcat(buf, fs->device_name);
retval = ext2fs_allocate_inode_bitmap(fs, buf, &fs->inode_map);
if (retval)
goto cleanup;
ext2fs_free_mem(&buf);
retval = ext2fs_get_array(fs->desc_blocks, fs->blocksize,
&fs->group_desc);
if (retval)
goto cleanup;
memset(fs->group_desc, 0, (size_t) fs->desc_blocks * fs->blocksize);
/*
* Reserve the superblock and group descriptors for each
* group, and fill in the correct group statistics for group.
* Note that although the block bitmap, inode bitmap, and
* inode table have not been allocated (and in fact won't be
* by this routine), they are accounted for nevertheless.
*
* If FLEX_BG meta-data grouping is used, only account for the
* superblock and group descriptors (the inode tables and
* bitmaps will be accounted for when allocated).
*/
free_blocks = 0;
csum_flag = ext2fs_has_group_desc_csum(fs);
reserved_inos = super->s_first_ino;
for (i = 0; i < fs->group_desc_count; i++) {
/*
* Don't set the BLOCK_UNINIT group for the last group
* because the block bitmap needs to be padded.
*/
if (csum_flag) {
if (i != fs->group_desc_count - 1)
ext2fs_bg_flags_set(fs, i,
EXT2_BG_BLOCK_UNINIT);
ext2fs_bg_flags_set(fs, i, EXT2_BG_INODE_UNINIT);
numblocks = super->s_inodes_per_group;
if (reserved_inos) {
if (numblocks > reserved_inos) {
numblocks -= reserved_inos;
reserved_inos = 0;
} else {
reserved_inos -= numblocks;
numblocks = 0;
}
}
ext2fs_bg_itable_unused_set(fs, i, numblocks);
}
numblocks = ext2fs_reserve_super_and_bgd(fs, i, fs->block_map);
if (fs->super->s_log_groups_per_flex)
numblocks += 2 + fs->inode_blocks_per_group;
free_blocks += numblocks;
ext2fs_bg_free_blocks_count_set(fs, i, numblocks);
ext2fs_bg_free_inodes_count_set(fs, i, fs->super->s_inodes_per_group);
ext2fs_bg_used_dirs_count_set(fs, i, 0);
ext2fs_group_desc_csum_set(fs, i);
}
free_blocks &= ~EXT2FS_CLUSTER_MASK(fs);
ext2fs_free_blocks_count_set(super, free_blocks);
c = (char) 255;
if (((int) c) == -1) {
super->s_flags |= EXT2_FLAGS_SIGNED_HASH;
} else {
super->s_flags |= EXT2_FLAGS_UNSIGNED_HASH;
}
ext2fs_mark_super_dirty(fs);
ext2fs_mark_bb_dirty(fs);
ext2fs_mark_ib_dirty(fs);
io_channel_set_blksize(fs->io, fs->blocksize);
*ret_fs = fs;
return 0;
cleanup:
free(buf);
ext2fs_free(fs);
return retval;
}
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
}
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;
blk64_t size;
int fd, overhead;
int use_old_ioctl = 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);
if (!(fs->super->s_feature_compat &
EXT2_FEATURE_COMPAT_RESIZE_INODE) &&
new_desc_blocks != fs->desc_blocks) {
com_err(program_name, 0,
_("Filesystem does not support online resizing"));
exit(1);
}
fd = open(mtpt, O_RDONLY);
if (fd < 0) {
com_err(program_name, errno,
_("while trying to open mountpoint %s"), mtpt);
exit(1);
}
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)
return retval;
retval = ext2fs_dup_handle(fs, &new_fs);
if (retval)
return retval;
/* The current method of adding one block group at a time to a
* mounted filesystem means it is impossible to accomodate 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.
*/
new_fs->super->s_feature_incompat &= ~EXT4_FEATURE_INCOMPAT_FLEX_BG;
retval = adjust_fs_info(new_fs, fs, 0, *new_size);
if (retval)
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 = sb->s_blocks_per_group;
if (i == new_fs->group_desc_count-1) {
input.blocks_count = ext2fs_blocks_count(new_fs->super) -
sb->s_first_data_block -
(i * sb->s_blocks_per_group);
}
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
}
