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-rw-r--r--resize/online.c293
1 files changed, 293 insertions, 0 deletions
diff --git a/resize/online.c b/resize/online.c
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+++ b/resize/online.c
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+/*
+ * online.c --- Do on-line resizing of the ext3 filesystem
+ *
+ * Copyright (C) 2006 by Theodore Ts'o
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the GNU Public
+ * License.
+ * %End-Header%
+ */
+
+#include "config.h"
+#include "resize2fs.h"
+#ifdef HAVE_SYS_IOCTL_H
+#include <sys/ioctl.h>
+#endif
+#include <sys/stat.h>
+#include <fcntl.h>
+
+extern char *program_name;
+
+#define MAX_32_NUM ((((unsigned long long) 1) << 32) - 1)
+
+#ifdef __linux__
+static int parse_version_number(const char *s)
+{
+ int major, minor, rev;
+ char *endptr;
+ const char *cp = s;
+
+ if (!s)
+ return 0;
+ major = strtol(cp, &endptr, 10);
+ if (cp == endptr || *endptr != '.')
+ return 0;
+ cp = endptr + 1;
+ minor = strtol(cp, &endptr, 10);
+ if (cp == endptr || *endptr != '.')
+ return 0;
+ cp = endptr + 1;
+ rev = strtol(cp, &endptr, 10);
+ if (cp == endptr)
+ return 0;
+ return ((((major * 256) + minor) * 256) + rev);
+}
+
+#define VERSION_CODE(a,b,c) (((a) << 16) + ((b) << 8) + (c))
+
+#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;
+ blk_t size;
+ int fd;
+ 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, (unsigned long long) *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++) {
+ 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
+}
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