/* * 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 #endif #include #include extern char *program_name; #define MAX_32_NUM ((((unsigned long long) 1) << 32) - 1) 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; 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); } 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; } 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); } 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 = 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 }