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An online resize of a file system with the bigalloc feature enabled and a 1k block size would be refused since ext4_resize_begin() did not understand s_first_data_block is 0 for all bigalloc file systems, even when the block size is 1k. Signed-off-by: Theodore Ts'o <tytso@mit.edu> Cc: stable@vger.kernel.org
2073 lines
59 KiB
C
2073 lines
59 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/fs/ext4/resize.c
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*
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* Support for resizing an ext4 filesystem while it is mounted.
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*
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* Copyright (C) 2001, 2002 Andreas Dilger <adilger@clusterfs.com>
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*
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* This could probably be made into a module, because it is not often in use.
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*/
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#define EXT4FS_DEBUG
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include "ext4_jbd2.h"
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int ext4_resize_begin(struct super_block *sb)
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{
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struct ext4_sb_info *sbi = EXT4_SB(sb);
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int ret = 0;
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if (!capable(CAP_SYS_RESOURCE))
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return -EPERM;
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/*
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* If we are not using the primary superblock/GDT copy don't resize,
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* because the user tools have no way of handling this. Probably a
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* bad time to do it anyways.
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*/
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if (EXT4_B2C(sbi, sbi->s_sbh->b_blocknr) !=
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le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block)) {
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ext4_warning(sb, "won't resize using backup superblock at %llu",
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(unsigned long long)EXT4_SB(sb)->s_sbh->b_blocknr);
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return -EPERM;
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}
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/*
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* We are not allowed to do online-resizing on a filesystem mounted
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* with error, because it can destroy the filesystem easily.
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*/
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if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
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ext4_warning(sb, "There are errors in the filesystem, "
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"so online resizing is not allowed");
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return -EPERM;
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}
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if (test_and_set_bit_lock(EXT4_FLAGS_RESIZING,
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&EXT4_SB(sb)->s_ext4_flags))
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ret = -EBUSY;
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return ret;
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}
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void ext4_resize_end(struct super_block *sb)
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{
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clear_bit_unlock(EXT4_FLAGS_RESIZING, &EXT4_SB(sb)->s_ext4_flags);
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smp_mb__after_atomic();
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}
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static ext4_group_t ext4_meta_bg_first_group(struct super_block *sb,
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ext4_group_t group) {
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return (group >> EXT4_DESC_PER_BLOCK_BITS(sb)) <<
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EXT4_DESC_PER_BLOCK_BITS(sb);
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}
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static ext4_fsblk_t ext4_meta_bg_first_block_no(struct super_block *sb,
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ext4_group_t group) {
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group = ext4_meta_bg_first_group(sb, group);
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return ext4_group_first_block_no(sb, group);
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}
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static ext4_grpblk_t ext4_group_overhead_blocks(struct super_block *sb,
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ext4_group_t group) {
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ext4_grpblk_t overhead;
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overhead = ext4_bg_num_gdb(sb, group);
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if (ext4_bg_has_super(sb, group))
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overhead += 1 +
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le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks);
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return overhead;
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}
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#define outside(b, first, last) ((b) < (first) || (b) >= (last))
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#define inside(b, first, last) ((b) >= (first) && (b) < (last))
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static int verify_group_input(struct super_block *sb,
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struct ext4_new_group_data *input)
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{
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struct ext4_sb_info *sbi = EXT4_SB(sb);
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struct ext4_super_block *es = sbi->s_es;
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ext4_fsblk_t start = ext4_blocks_count(es);
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ext4_fsblk_t end = start + input->blocks_count;
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ext4_group_t group = input->group;
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ext4_fsblk_t itend = input->inode_table + sbi->s_itb_per_group;
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unsigned overhead;
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ext4_fsblk_t metaend;
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struct buffer_head *bh = NULL;
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ext4_grpblk_t free_blocks_count, offset;
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int err = -EINVAL;
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if (group != sbi->s_groups_count) {
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ext4_warning(sb, "Cannot add at group %u (only %u groups)",
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input->group, sbi->s_groups_count);
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return -EINVAL;
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}
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overhead = ext4_group_overhead_blocks(sb, group);
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metaend = start + overhead;
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input->free_clusters_count = free_blocks_count =
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input->blocks_count - 2 - overhead - sbi->s_itb_per_group;
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if (test_opt(sb, DEBUG))
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printk(KERN_DEBUG "EXT4-fs: adding %s group %u: %u blocks "
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"(%d free, %u reserved)\n",
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ext4_bg_has_super(sb, input->group) ? "normal" :
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"no-super", input->group, input->blocks_count,
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free_blocks_count, input->reserved_blocks);
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ext4_get_group_no_and_offset(sb, start, NULL, &offset);
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if (offset != 0)
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ext4_warning(sb, "Last group not full");
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else if (input->reserved_blocks > input->blocks_count / 5)
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ext4_warning(sb, "Reserved blocks too high (%u)",
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input->reserved_blocks);
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else if (free_blocks_count < 0)
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ext4_warning(sb, "Bad blocks count %u",
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input->blocks_count);
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else if (!(bh = sb_bread(sb, end - 1)))
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ext4_warning(sb, "Cannot read last block (%llu)",
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end - 1);
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else if (outside(input->block_bitmap, start, end))
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ext4_warning(sb, "Block bitmap not in group (block %llu)",
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(unsigned long long)input->block_bitmap);
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else if (outside(input->inode_bitmap, start, end))
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ext4_warning(sb, "Inode bitmap not in group (block %llu)",
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(unsigned long long)input->inode_bitmap);
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else if (outside(input->inode_table, start, end) ||
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outside(itend - 1, start, end))
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ext4_warning(sb, "Inode table not in group (blocks %llu-%llu)",
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(unsigned long long)input->inode_table, itend - 1);
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else if (input->inode_bitmap == input->block_bitmap)
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ext4_warning(sb, "Block bitmap same as inode bitmap (%llu)",
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(unsigned long long)input->block_bitmap);
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else if (inside(input->block_bitmap, input->inode_table, itend))
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ext4_warning(sb, "Block bitmap (%llu) in inode table "
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"(%llu-%llu)",
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(unsigned long long)input->block_bitmap,
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(unsigned long long)input->inode_table, itend - 1);
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else if (inside(input->inode_bitmap, input->inode_table, itend))
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ext4_warning(sb, "Inode bitmap (%llu) in inode table "
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"(%llu-%llu)",
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(unsigned long long)input->inode_bitmap,
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(unsigned long long)input->inode_table, itend - 1);
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else if (inside(input->block_bitmap, start, metaend))
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ext4_warning(sb, "Block bitmap (%llu) in GDT table (%llu-%llu)",
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(unsigned long long)input->block_bitmap,
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start, metaend - 1);
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else if (inside(input->inode_bitmap, start, metaend))
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ext4_warning(sb, "Inode bitmap (%llu) in GDT table (%llu-%llu)",
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(unsigned long long)input->inode_bitmap,
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start, metaend - 1);
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else if (inside(input->inode_table, start, metaend) ||
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inside(itend - 1, start, metaend))
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ext4_warning(sb, "Inode table (%llu-%llu) overlaps GDT table "
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"(%llu-%llu)",
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(unsigned long long)input->inode_table,
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itend - 1, start, metaend - 1);
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else
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err = 0;
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brelse(bh);
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return err;
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}
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/*
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* ext4_new_flex_group_data is used by 64bit-resize interface to add a flex
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* group each time.
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*/
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struct ext4_new_flex_group_data {
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struct ext4_new_group_data *groups; /* new_group_data for groups
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in the flex group */
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__u16 *bg_flags; /* block group flags of groups
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in @groups */
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ext4_group_t count; /* number of groups in @groups
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*/
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};
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/*
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* alloc_flex_gd() allocates a ext4_new_flex_group_data with size of
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* @flexbg_size.
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*
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* Returns NULL on failure otherwise address of the allocated structure.
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*/
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static struct ext4_new_flex_group_data *alloc_flex_gd(unsigned long flexbg_size)
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{
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struct ext4_new_flex_group_data *flex_gd;
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flex_gd = kmalloc(sizeof(*flex_gd), GFP_NOFS);
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if (flex_gd == NULL)
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goto out3;
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if (flexbg_size >= UINT_MAX / sizeof(struct ext4_new_group_data))
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goto out2;
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flex_gd->count = flexbg_size;
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flex_gd->groups = kmalloc_array(flexbg_size,
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sizeof(struct ext4_new_group_data),
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GFP_NOFS);
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if (flex_gd->groups == NULL)
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goto out2;
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flex_gd->bg_flags = kmalloc_array(flexbg_size, sizeof(__u16),
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GFP_NOFS);
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if (flex_gd->bg_flags == NULL)
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goto out1;
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return flex_gd;
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out1:
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kfree(flex_gd->groups);
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out2:
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kfree(flex_gd);
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out3:
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return NULL;
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}
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static void free_flex_gd(struct ext4_new_flex_group_data *flex_gd)
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{
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kfree(flex_gd->bg_flags);
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kfree(flex_gd->groups);
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kfree(flex_gd);
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}
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/*
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* ext4_alloc_group_tables() allocates block bitmaps, inode bitmaps
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* and inode tables for a flex group.
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*
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* This function is used by 64bit-resize. Note that this function allocates
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* group tables from the 1st group of groups contained by @flexgd, which may
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* be a partial of a flex group.
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*
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* @sb: super block of fs to which the groups belongs
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*
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* Returns 0 on a successful allocation of the metadata blocks in the
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* block group.
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*/
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static int ext4_alloc_group_tables(struct super_block *sb,
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struct ext4_new_flex_group_data *flex_gd,
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int flexbg_size)
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{
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struct ext4_new_group_data *group_data = flex_gd->groups;
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ext4_fsblk_t start_blk;
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ext4_fsblk_t last_blk;
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ext4_group_t src_group;
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ext4_group_t bb_index = 0;
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ext4_group_t ib_index = 0;
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ext4_group_t it_index = 0;
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ext4_group_t group;
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ext4_group_t last_group;
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unsigned overhead;
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__u16 uninit_mask = (flexbg_size > 1) ? ~EXT4_BG_BLOCK_UNINIT : ~0;
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int i;
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BUG_ON(flex_gd->count == 0 || group_data == NULL);
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src_group = group_data[0].group;
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last_group = src_group + flex_gd->count - 1;
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BUG_ON((flexbg_size > 1) && ((src_group & ~(flexbg_size - 1)) !=
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(last_group & ~(flexbg_size - 1))));
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next_group:
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group = group_data[0].group;
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if (src_group >= group_data[0].group + flex_gd->count)
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return -ENOSPC;
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start_blk = ext4_group_first_block_no(sb, src_group);
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last_blk = start_blk + group_data[src_group - group].blocks_count;
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overhead = ext4_group_overhead_blocks(sb, src_group);
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start_blk += overhead;
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/* We collect contiguous blocks as much as possible. */
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src_group++;
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for (; src_group <= last_group; src_group++) {
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overhead = ext4_group_overhead_blocks(sb, src_group);
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if (overhead == 0)
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last_blk += group_data[src_group - group].blocks_count;
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else
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break;
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}
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/* Allocate block bitmaps */
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for (; bb_index < flex_gd->count; bb_index++) {
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if (start_blk >= last_blk)
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goto next_group;
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group_data[bb_index].block_bitmap = start_blk++;
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group = ext4_get_group_number(sb, start_blk - 1);
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group -= group_data[0].group;
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group_data[group].mdata_blocks++;
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flex_gd->bg_flags[group] &= uninit_mask;
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}
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/* Allocate inode bitmaps */
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for (; ib_index < flex_gd->count; ib_index++) {
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if (start_blk >= last_blk)
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goto next_group;
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group_data[ib_index].inode_bitmap = start_blk++;
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group = ext4_get_group_number(sb, start_blk - 1);
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group -= group_data[0].group;
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group_data[group].mdata_blocks++;
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flex_gd->bg_flags[group] &= uninit_mask;
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}
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/* Allocate inode tables */
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for (; it_index < flex_gd->count; it_index++) {
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unsigned int itb = EXT4_SB(sb)->s_itb_per_group;
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ext4_fsblk_t next_group_start;
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if (start_blk + itb > last_blk)
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goto next_group;
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group_data[it_index].inode_table = start_blk;
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group = ext4_get_group_number(sb, start_blk);
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next_group_start = ext4_group_first_block_no(sb, group + 1);
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group -= group_data[0].group;
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if (start_blk + itb > next_group_start) {
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flex_gd->bg_flags[group + 1] &= uninit_mask;
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overhead = start_blk + itb - next_group_start;
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group_data[group + 1].mdata_blocks += overhead;
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itb -= overhead;
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}
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group_data[group].mdata_blocks += itb;
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flex_gd->bg_flags[group] &= uninit_mask;
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start_blk += EXT4_SB(sb)->s_itb_per_group;
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}
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/* Update free clusters count to exclude metadata blocks */
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for (i = 0; i < flex_gd->count; i++) {
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group_data[i].free_clusters_count -=
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EXT4_NUM_B2C(EXT4_SB(sb),
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group_data[i].mdata_blocks);
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}
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if (test_opt(sb, DEBUG)) {
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int i;
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group = group_data[0].group;
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printk(KERN_DEBUG "EXT4-fs: adding a flex group with "
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"%d groups, flexbg size is %d:\n", flex_gd->count,
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flexbg_size);
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for (i = 0; i < flex_gd->count; i++) {
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ext4_debug(
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"adding %s group %u: %u blocks (%d free, %d mdata blocks)\n",
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ext4_bg_has_super(sb, group + i) ? "normal" :
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"no-super", group + i,
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group_data[i].blocks_count,
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group_data[i].free_clusters_count,
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group_data[i].mdata_blocks);
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}
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}
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return 0;
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}
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static struct buffer_head *bclean(handle_t *handle, struct super_block *sb,
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ext4_fsblk_t blk)
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{
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struct buffer_head *bh;
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int err;
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bh = sb_getblk(sb, blk);
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if (unlikely(!bh))
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return ERR_PTR(-ENOMEM);
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BUFFER_TRACE(bh, "get_write_access");
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if ((err = ext4_journal_get_write_access(handle, bh))) {
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brelse(bh);
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bh = ERR_PTR(err);
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} else {
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memset(bh->b_data, 0, sb->s_blocksize);
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set_buffer_uptodate(bh);
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}
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return bh;
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}
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/*
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* If we have fewer than thresh credits, extend by EXT4_MAX_TRANS_DATA.
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* If that fails, restart the transaction & regain write access for the
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* buffer head which is used for block_bitmap modifications.
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*/
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static int extend_or_restart_transaction(handle_t *handle, int thresh)
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{
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int err;
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|
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if (ext4_handle_has_enough_credits(handle, thresh))
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return 0;
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|
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err = ext4_journal_extend(handle, EXT4_MAX_TRANS_DATA);
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if (err < 0)
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return err;
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if (err) {
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err = ext4_journal_restart(handle, EXT4_MAX_TRANS_DATA);
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if (err)
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return err;
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}
|
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|
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return 0;
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}
|
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|
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/*
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* set_flexbg_block_bitmap() mark clusters [@first_cluster, @last_cluster] used.
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*
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* Helper function for ext4_setup_new_group_blocks() which set .
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*
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* @sb: super block
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* @handle: journal handle
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* @flex_gd: flex group data
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*/
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static int set_flexbg_block_bitmap(struct super_block *sb, handle_t *handle,
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struct ext4_new_flex_group_data *flex_gd,
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ext4_fsblk_t first_cluster, ext4_fsblk_t last_cluster)
|
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{
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struct ext4_sb_info *sbi = EXT4_SB(sb);
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ext4_group_t count = last_cluster - first_cluster + 1;
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ext4_group_t count2;
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ext4_debug("mark clusters [%llu-%llu] used\n", first_cluster,
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last_cluster);
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for (count2 = count; count > 0;
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count -= count2, first_cluster += count2) {
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ext4_fsblk_t start;
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struct buffer_head *bh;
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ext4_group_t group;
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int err;
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group = ext4_get_group_number(sb, EXT4_C2B(sbi, first_cluster));
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start = EXT4_B2C(sbi, ext4_group_first_block_no(sb, group));
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group -= flex_gd->groups[0].group;
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|
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count2 = EXT4_CLUSTERS_PER_GROUP(sb) - (first_cluster - start);
|
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if (count2 > count)
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count2 = count;
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|
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if (flex_gd->bg_flags[group] & EXT4_BG_BLOCK_UNINIT) {
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BUG_ON(flex_gd->count > 1);
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continue;
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}
|
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|
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err = extend_or_restart_transaction(handle, 1);
|
|
if (err)
|
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return err;
|
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|
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bh = sb_getblk(sb, flex_gd->groups[group].block_bitmap);
|
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if (unlikely(!bh))
|
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return -ENOMEM;
|
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|
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BUFFER_TRACE(bh, "get_write_access");
|
|
err = ext4_journal_get_write_access(handle, bh);
|
|
if (err)
|
|
return err;
|
|
ext4_debug("mark block bitmap %#04llx (+%llu/%u)\n",
|
|
first_cluster, first_cluster - start, count2);
|
|
ext4_set_bits(bh->b_data, first_cluster - start, count2);
|
|
|
|
err = ext4_handle_dirty_metadata(handle, NULL, bh);
|
|
if (unlikely(err))
|
|
return err;
|
|
brelse(bh);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Set up the block and inode bitmaps, and the inode table for the new groups.
|
|
* This doesn't need to be part of the main transaction, since we are only
|
|
* changing blocks outside the actual filesystem. We still do journaling to
|
|
* ensure the recovery is correct in case of a failure just after resize.
|
|
* If any part of this fails, we simply abort the resize.
|
|
*
|
|
* setup_new_flex_group_blocks handles a flex group as follow:
|
|
* 1. copy super block and GDT, and initialize group tables if necessary.
|
|
* In this step, we only set bits in blocks bitmaps for blocks taken by
|
|
* super block and GDT.
|
|
* 2. allocate group tables in block bitmaps, that is, set bits in block
|
|
* bitmap for blocks taken by group tables.
|
|
*/
|
|
static int setup_new_flex_group_blocks(struct super_block *sb,
|
|
struct ext4_new_flex_group_data *flex_gd)
|
|
{
|
|
int group_table_count[] = {1, 1, EXT4_SB(sb)->s_itb_per_group};
|
|
ext4_fsblk_t start;
|
|
ext4_fsblk_t block;
|
|
struct ext4_sb_info *sbi = EXT4_SB(sb);
|
|
struct ext4_super_block *es = sbi->s_es;
|
|
struct ext4_new_group_data *group_data = flex_gd->groups;
|
|
__u16 *bg_flags = flex_gd->bg_flags;
|
|
handle_t *handle;
|
|
ext4_group_t group, count;
|
|
struct buffer_head *bh = NULL;
|
|
int reserved_gdb, i, j, err = 0, err2;
|
|
int meta_bg;
|
|
|
|
BUG_ON(!flex_gd->count || !group_data ||
|
|
group_data[0].group != sbi->s_groups_count);
|
|
|
|
reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks);
|
|
meta_bg = ext4_has_feature_meta_bg(sb);
|
|
|
|
/* This transaction may be extended/restarted along the way */
|
|
handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, EXT4_MAX_TRANS_DATA);
|
|
if (IS_ERR(handle))
|
|
return PTR_ERR(handle);
|
|
|
|
group = group_data[0].group;
|
|
for (i = 0; i < flex_gd->count; i++, group++) {
|
|
unsigned long gdblocks;
|
|
ext4_grpblk_t overhead;
|
|
|
|
gdblocks = ext4_bg_num_gdb(sb, group);
|
|
start = ext4_group_first_block_no(sb, group);
|
|
|
|
if (meta_bg == 0 && !ext4_bg_has_super(sb, group))
|
|
goto handle_itb;
|
|
|
|
if (meta_bg == 1) {
|
|
ext4_group_t first_group;
|
|
first_group = ext4_meta_bg_first_group(sb, group);
|
|
if (first_group != group + 1 &&
|
|
first_group != group + EXT4_DESC_PER_BLOCK(sb) - 1)
|
|
goto handle_itb;
|
|
}
|
|
|
|
block = start + ext4_bg_has_super(sb, group);
|
|
/* Copy all of the GDT blocks into the backup in this group */
|
|
for (j = 0; j < gdblocks; j++, block++) {
|
|
struct buffer_head *gdb;
|
|
|
|
ext4_debug("update backup group %#04llx\n", block);
|
|
err = extend_or_restart_transaction(handle, 1);
|
|
if (err)
|
|
goto out;
|
|
|
|
gdb = sb_getblk(sb, block);
|
|
if (unlikely(!gdb)) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
BUFFER_TRACE(gdb, "get_write_access");
|
|
err = ext4_journal_get_write_access(handle, gdb);
|
|
if (err) {
|
|
brelse(gdb);
|
|
goto out;
|
|
}
|
|
memcpy(gdb->b_data, sbi->s_group_desc[j]->b_data,
|
|
gdb->b_size);
|
|
set_buffer_uptodate(gdb);
|
|
|
|
err = ext4_handle_dirty_metadata(handle, NULL, gdb);
|
|
if (unlikely(err)) {
|
|
brelse(gdb);
|
|
goto out;
|
|
}
|
|
brelse(gdb);
|
|
}
|
|
|
|
/* Zero out all of the reserved backup group descriptor
|
|
* table blocks
|
|
*/
|
|
if (ext4_bg_has_super(sb, group)) {
|
|
err = sb_issue_zeroout(sb, gdblocks + start + 1,
|
|
reserved_gdb, GFP_NOFS);
|
|
if (err)
|
|
goto out;
|
|
}
|
|
|
|
handle_itb:
|
|
/* Initialize group tables of the grop @group */
|
|
if (!(bg_flags[i] & EXT4_BG_INODE_ZEROED))
|
|
goto handle_bb;
|
|
|
|
/* Zero out all of the inode table blocks */
|
|
block = group_data[i].inode_table;
|
|
ext4_debug("clear inode table blocks %#04llx -> %#04lx\n",
|
|
block, sbi->s_itb_per_group);
|
|
err = sb_issue_zeroout(sb, block, sbi->s_itb_per_group,
|
|
GFP_NOFS);
|
|
if (err)
|
|
goto out;
|
|
|
|
handle_bb:
|
|
if (bg_flags[i] & EXT4_BG_BLOCK_UNINIT)
|
|
goto handle_ib;
|
|
|
|
/* Initialize block bitmap of the @group */
|
|
block = group_data[i].block_bitmap;
|
|
err = extend_or_restart_transaction(handle, 1);
|
|
if (err)
|
|
goto out;
|
|
|
|
bh = bclean(handle, sb, block);
|
|
if (IS_ERR(bh)) {
|
|
err = PTR_ERR(bh);
|
|
bh = NULL;
|
|
goto out;
|
|
}
|
|
overhead = ext4_group_overhead_blocks(sb, group);
|
|
if (overhead != 0) {
|
|
ext4_debug("mark backup superblock %#04llx (+0)\n",
|
|
start);
|
|
ext4_set_bits(bh->b_data, 0,
|
|
EXT4_NUM_B2C(sbi, overhead));
|
|
}
|
|
ext4_mark_bitmap_end(EXT4_B2C(sbi, group_data[i].blocks_count),
|
|
sb->s_blocksize * 8, bh->b_data);
|
|
err = ext4_handle_dirty_metadata(handle, NULL, bh);
|
|
if (err)
|
|
goto out;
|
|
brelse(bh);
|
|
|
|
handle_ib:
|
|
if (bg_flags[i] & EXT4_BG_INODE_UNINIT)
|
|
continue;
|
|
|
|
/* Initialize inode bitmap of the @group */
|
|
block = group_data[i].inode_bitmap;
|
|
err = extend_or_restart_transaction(handle, 1);
|
|
if (err)
|
|
goto out;
|
|
/* Mark unused entries in inode bitmap used */
|
|
bh = bclean(handle, sb, block);
|
|
if (IS_ERR(bh)) {
|
|
err = PTR_ERR(bh);
|
|
bh = NULL;
|
|
goto out;
|
|
}
|
|
|
|
ext4_mark_bitmap_end(EXT4_INODES_PER_GROUP(sb),
|
|
sb->s_blocksize * 8, bh->b_data);
|
|
err = ext4_handle_dirty_metadata(handle, NULL, bh);
|
|
if (err)
|
|
goto out;
|
|
brelse(bh);
|
|
}
|
|
bh = NULL;
|
|
|
|
/* Mark group tables in block bitmap */
|
|
for (j = 0; j < GROUP_TABLE_COUNT; j++) {
|
|
count = group_table_count[j];
|
|
start = (&group_data[0].block_bitmap)[j];
|
|
block = start;
|
|
for (i = 1; i < flex_gd->count; i++) {
|
|
block += group_table_count[j];
|
|
if (block == (&group_data[i].block_bitmap)[j]) {
|
|
count += group_table_count[j];
|
|
continue;
|
|
}
|
|
err = set_flexbg_block_bitmap(sb, handle,
|
|
flex_gd,
|
|
EXT4_B2C(sbi, start),
|
|
EXT4_B2C(sbi,
|
|
start + count
|
|
- 1));
|
|
if (err)
|
|
goto out;
|
|
count = group_table_count[j];
|
|
start = (&group_data[i].block_bitmap)[j];
|
|
block = start;
|
|
}
|
|
|
|
if (count) {
|
|
err = set_flexbg_block_bitmap(sb, handle,
|
|
flex_gd,
|
|
EXT4_B2C(sbi, start),
|
|
EXT4_B2C(sbi,
|
|
start + count
|
|
- 1));
|
|
if (err)
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
out:
|
|
brelse(bh);
|
|
err2 = ext4_journal_stop(handle);
|
|
if (err2 && !err)
|
|
err = err2;
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Iterate through the groups which hold BACKUP superblock/GDT copies in an
|
|
* ext4 filesystem. The counters should be initialized to 1, 5, and 7 before
|
|
* calling this for the first time. In a sparse filesystem it will be the
|
|
* sequence of powers of 3, 5, and 7: 1, 3, 5, 7, 9, 25, 27, 49, 81, ...
|
|
* For a non-sparse filesystem it will be every group: 1, 2, 3, 4, ...
|
|
*/
|
|
static unsigned ext4_list_backups(struct super_block *sb, unsigned *three,
|
|
unsigned *five, unsigned *seven)
|
|
{
|
|
unsigned *min = three;
|
|
int mult = 3;
|
|
unsigned ret;
|
|
|
|
if (!ext4_has_feature_sparse_super(sb)) {
|
|
ret = *min;
|
|
*min += 1;
|
|
return ret;
|
|
}
|
|
|
|
if (*five < *min) {
|
|
min = five;
|
|
mult = 5;
|
|
}
|
|
if (*seven < *min) {
|
|
min = seven;
|
|
mult = 7;
|
|
}
|
|
|
|
ret = *min;
|
|
*min *= mult;
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Check that all of the backup GDT blocks are held in the primary GDT block.
|
|
* It is assumed that they are stored in group order. Returns the number of
|
|
* groups in current filesystem that have BACKUPS, or -ve error code.
|
|
*/
|
|
static int verify_reserved_gdb(struct super_block *sb,
|
|
ext4_group_t end,
|
|
struct buffer_head *primary)
|
|
{
|
|
const ext4_fsblk_t blk = primary->b_blocknr;
|
|
unsigned three = 1;
|
|
unsigned five = 5;
|
|
unsigned seven = 7;
|
|
unsigned grp;
|
|
__le32 *p = (__le32 *)primary->b_data;
|
|
int gdbackups = 0;
|
|
|
|
while ((grp = ext4_list_backups(sb, &three, &five, &seven)) < end) {
|
|
if (le32_to_cpu(*p++) !=
|
|
grp * EXT4_BLOCKS_PER_GROUP(sb) + blk){
|
|
ext4_warning(sb, "reserved GDT %llu"
|
|
" missing grp %d (%llu)",
|
|
blk, grp,
|
|
grp *
|
|
(ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
|
|
blk);
|
|
return -EINVAL;
|
|
}
|
|
if (++gdbackups > EXT4_ADDR_PER_BLOCK(sb))
|
|
return -EFBIG;
|
|
}
|
|
|
|
return gdbackups;
|
|
}
|
|
|
|
/*
|
|
* Called when we need to bring a reserved group descriptor table block into
|
|
* use from the resize inode. The primary copy of the new GDT block currently
|
|
* is an indirect block (under the double indirect block in the resize inode).
|
|
* The new backup GDT blocks will be stored as leaf blocks in this indirect
|
|
* block, in group order. Even though we know all the block numbers we need,
|
|
* we check to ensure that the resize inode has actually reserved these blocks.
|
|
*
|
|
* Don't need to update the block bitmaps because the blocks are still in use.
|
|
*
|
|
* We get all of the error cases out of the way, so that we are sure to not
|
|
* fail once we start modifying the data on disk, because JBD has no rollback.
|
|
*/
|
|
static int add_new_gdb(handle_t *handle, struct inode *inode,
|
|
ext4_group_t group)
|
|
{
|
|
struct super_block *sb = inode->i_sb;
|
|
struct ext4_super_block *es = EXT4_SB(sb)->s_es;
|
|
unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
|
|
ext4_fsblk_t gdblock = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + gdb_num;
|
|
struct buffer_head **o_group_desc, **n_group_desc;
|
|
struct buffer_head *dind;
|
|
struct buffer_head *gdb_bh;
|
|
int gdbackups;
|
|
struct ext4_iloc iloc;
|
|
__le32 *data;
|
|
int err;
|
|
|
|
if (test_opt(sb, DEBUG))
|
|
printk(KERN_DEBUG
|
|
"EXT4-fs: ext4_add_new_gdb: adding group block %lu\n",
|
|
gdb_num);
|
|
|
|
gdb_bh = sb_bread(sb, gdblock);
|
|
if (!gdb_bh)
|
|
return -EIO;
|
|
|
|
gdbackups = verify_reserved_gdb(sb, group, gdb_bh);
|
|
if (gdbackups < 0) {
|
|
err = gdbackups;
|
|
goto exit_bh;
|
|
}
|
|
|
|
data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK;
|
|
dind = sb_bread(sb, le32_to_cpu(*data));
|
|
if (!dind) {
|
|
err = -EIO;
|
|
goto exit_bh;
|
|
}
|
|
|
|
data = (__le32 *)dind->b_data;
|
|
if (le32_to_cpu(data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)]) != gdblock) {
|
|
ext4_warning(sb, "new group %u GDT block %llu not reserved",
|
|
group, gdblock);
|
|
err = -EINVAL;
|
|
goto exit_dind;
|
|
}
|
|
|
|
BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access");
|
|
err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh);
|
|
if (unlikely(err))
|
|
goto exit_dind;
|
|
|
|
BUFFER_TRACE(gdb_bh, "get_write_access");
|
|
err = ext4_journal_get_write_access(handle, gdb_bh);
|
|
if (unlikely(err))
|
|
goto exit_dind;
|
|
|
|
BUFFER_TRACE(dind, "get_write_access");
|
|
err = ext4_journal_get_write_access(handle, dind);
|
|
if (unlikely(err))
|
|
ext4_std_error(sb, err);
|
|
|
|
/* ext4_reserve_inode_write() gets a reference on the iloc */
|
|
err = ext4_reserve_inode_write(handle, inode, &iloc);
|
|
if (unlikely(err))
|
|
goto exit_dind;
|
|
|
|
n_group_desc = ext4_kvmalloc((gdb_num + 1) *
|
|
sizeof(struct buffer_head *),
|
|
GFP_NOFS);
|
|
if (!n_group_desc) {
|
|
err = -ENOMEM;
|
|
ext4_warning(sb, "not enough memory for %lu groups",
|
|
gdb_num + 1);
|
|
goto exit_inode;
|
|
}
|
|
|
|
/*
|
|
* Finally, we have all of the possible failures behind us...
|
|
*
|
|
* Remove new GDT block from inode double-indirect block and clear out
|
|
* the new GDT block for use (which also "frees" the backup GDT blocks
|
|
* from the reserved inode). We don't need to change the bitmaps for
|
|
* these blocks, because they are marked as in-use from being in the
|
|
* reserved inode, and will become GDT blocks (primary and backup).
|
|
*/
|
|
data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)] = 0;
|
|
err = ext4_handle_dirty_metadata(handle, NULL, dind);
|
|
if (unlikely(err)) {
|
|
ext4_std_error(sb, err);
|
|
goto exit_inode;
|
|
}
|
|
inode->i_blocks -= (gdbackups + 1) * sb->s_blocksize >>
|
|
(9 - EXT4_SB(sb)->s_cluster_bits);
|
|
ext4_mark_iloc_dirty(handle, inode, &iloc);
|
|
memset(gdb_bh->b_data, 0, sb->s_blocksize);
|
|
err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh);
|
|
if (unlikely(err)) {
|
|
ext4_std_error(sb, err);
|
|
goto exit_inode;
|
|
}
|
|
brelse(dind);
|
|
|
|
o_group_desc = EXT4_SB(sb)->s_group_desc;
|
|
memcpy(n_group_desc, o_group_desc,
|
|
EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *));
|
|
n_group_desc[gdb_num] = gdb_bh;
|
|
EXT4_SB(sb)->s_group_desc = n_group_desc;
|
|
EXT4_SB(sb)->s_gdb_count++;
|
|
kvfree(o_group_desc);
|
|
|
|
le16_add_cpu(&es->s_reserved_gdt_blocks, -1);
|
|
err = ext4_handle_dirty_super(handle, sb);
|
|
if (err)
|
|
ext4_std_error(sb, err);
|
|
|
|
return err;
|
|
|
|
exit_inode:
|
|
kvfree(n_group_desc);
|
|
brelse(iloc.bh);
|
|
exit_dind:
|
|
brelse(dind);
|
|
exit_bh:
|
|
brelse(gdb_bh);
|
|
|
|
ext4_debug("leaving with error %d\n", err);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* add_new_gdb_meta_bg is the sister of add_new_gdb.
|
|
*/
|
|
static int add_new_gdb_meta_bg(struct super_block *sb,
|
|
handle_t *handle, ext4_group_t group) {
|
|
ext4_fsblk_t gdblock;
|
|
struct buffer_head *gdb_bh;
|
|
struct buffer_head **o_group_desc, **n_group_desc;
|
|
unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
|
|
int err;
|
|
|
|
gdblock = ext4_meta_bg_first_block_no(sb, group) +
|
|
ext4_bg_has_super(sb, group);
|
|
gdb_bh = sb_bread(sb, gdblock);
|
|
if (!gdb_bh)
|
|
return -EIO;
|
|
n_group_desc = ext4_kvmalloc((gdb_num + 1) *
|
|
sizeof(struct buffer_head *),
|
|
GFP_NOFS);
|
|
if (!n_group_desc) {
|
|
err = -ENOMEM;
|
|
ext4_warning(sb, "not enough memory for %lu groups",
|
|
gdb_num + 1);
|
|
return err;
|
|
}
|
|
|
|
o_group_desc = EXT4_SB(sb)->s_group_desc;
|
|
memcpy(n_group_desc, o_group_desc,
|
|
EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *));
|
|
n_group_desc[gdb_num] = gdb_bh;
|
|
EXT4_SB(sb)->s_group_desc = n_group_desc;
|
|
EXT4_SB(sb)->s_gdb_count++;
|
|
kvfree(o_group_desc);
|
|
BUFFER_TRACE(gdb_bh, "get_write_access");
|
|
err = ext4_journal_get_write_access(handle, gdb_bh);
|
|
if (unlikely(err))
|
|
brelse(gdb_bh);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Called when we are adding a new group which has a backup copy of each of
|
|
* the GDT blocks (i.e. sparse group) and there are reserved GDT blocks.
|
|
* We need to add these reserved backup GDT blocks to the resize inode, so
|
|
* that they are kept for future resizing and not allocated to files.
|
|
*
|
|
* Each reserved backup GDT block will go into a different indirect block.
|
|
* The indirect blocks are actually the primary reserved GDT blocks,
|
|
* so we know in advance what their block numbers are. We only get the
|
|
* double-indirect block to verify it is pointing to the primary reserved
|
|
* GDT blocks so we don't overwrite a data block by accident. The reserved
|
|
* backup GDT blocks are stored in their reserved primary GDT block.
|
|
*/
|
|
static int reserve_backup_gdb(handle_t *handle, struct inode *inode,
|
|
ext4_group_t group)
|
|
{
|
|
struct super_block *sb = inode->i_sb;
|
|
int reserved_gdb =le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks);
|
|
int cluster_bits = EXT4_SB(sb)->s_cluster_bits;
|
|
struct buffer_head **primary;
|
|
struct buffer_head *dind;
|
|
struct ext4_iloc iloc;
|
|
ext4_fsblk_t blk;
|
|
__le32 *data, *end;
|
|
int gdbackups = 0;
|
|
int res, i;
|
|
int err;
|
|
|
|
primary = kmalloc_array(reserved_gdb, sizeof(*primary), GFP_NOFS);
|
|
if (!primary)
|
|
return -ENOMEM;
|
|
|
|
data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK;
|
|
dind = sb_bread(sb, le32_to_cpu(*data));
|
|
if (!dind) {
|
|
err = -EIO;
|
|
goto exit_free;
|
|
}
|
|
|
|
blk = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + EXT4_SB(sb)->s_gdb_count;
|
|
data = (__le32 *)dind->b_data + (EXT4_SB(sb)->s_gdb_count %
|
|
EXT4_ADDR_PER_BLOCK(sb));
|
|
end = (__le32 *)dind->b_data + EXT4_ADDR_PER_BLOCK(sb);
|
|
|
|
/* Get each reserved primary GDT block and verify it holds backups */
|
|
for (res = 0; res < reserved_gdb; res++, blk++) {
|
|
if (le32_to_cpu(*data) != blk) {
|
|
ext4_warning(sb, "reserved block %llu"
|
|
" not at offset %ld",
|
|
blk,
|
|
(long)(data - (__le32 *)dind->b_data));
|
|
err = -EINVAL;
|
|
goto exit_bh;
|
|
}
|
|
primary[res] = sb_bread(sb, blk);
|
|
if (!primary[res]) {
|
|
err = -EIO;
|
|
goto exit_bh;
|
|
}
|
|
gdbackups = verify_reserved_gdb(sb, group, primary[res]);
|
|
if (gdbackups < 0) {
|
|
brelse(primary[res]);
|
|
err = gdbackups;
|
|
goto exit_bh;
|
|
}
|
|
if (++data >= end)
|
|
data = (__le32 *)dind->b_data;
|
|
}
|
|
|
|
for (i = 0; i < reserved_gdb; i++) {
|
|
BUFFER_TRACE(primary[i], "get_write_access");
|
|
if ((err = ext4_journal_get_write_access(handle, primary[i])))
|
|
goto exit_bh;
|
|
}
|
|
|
|
if ((err = ext4_reserve_inode_write(handle, inode, &iloc)))
|
|
goto exit_bh;
|
|
|
|
/*
|
|
* Finally we can add each of the reserved backup GDT blocks from
|
|
* the new group to its reserved primary GDT block.
|
|
*/
|
|
blk = group * EXT4_BLOCKS_PER_GROUP(sb);
|
|
for (i = 0; i < reserved_gdb; i++) {
|
|
int err2;
|
|
data = (__le32 *)primary[i]->b_data;
|
|
/* printk("reserving backup %lu[%u] = %lu\n",
|
|
primary[i]->b_blocknr, gdbackups,
|
|
blk + primary[i]->b_blocknr); */
|
|
data[gdbackups] = cpu_to_le32(blk + primary[i]->b_blocknr);
|
|
err2 = ext4_handle_dirty_metadata(handle, NULL, primary[i]);
|
|
if (!err)
|
|
err = err2;
|
|
}
|
|
|
|
inode->i_blocks += reserved_gdb * sb->s_blocksize >> (9 - cluster_bits);
|
|
ext4_mark_iloc_dirty(handle, inode, &iloc);
|
|
|
|
exit_bh:
|
|
while (--res >= 0)
|
|
brelse(primary[res]);
|
|
brelse(dind);
|
|
|
|
exit_free:
|
|
kfree(primary);
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Update the backup copies of the ext4 metadata. These don't need to be part
|
|
* of the main resize transaction, because e2fsck will re-write them if there
|
|
* is a problem (basically only OOM will cause a problem). However, we
|
|
* _should_ update the backups if possible, in case the primary gets trashed
|
|
* for some reason and we need to run e2fsck from a backup superblock. The
|
|
* important part is that the new block and inode counts are in the backup
|
|
* superblocks, and the location of the new group metadata in the GDT backups.
|
|
*
|
|
* We do not need take the s_resize_lock for this, because these
|
|
* blocks are not otherwise touched by the filesystem code when it is
|
|
* mounted. We don't need to worry about last changing from
|
|
* sbi->s_groups_count, because the worst that can happen is that we
|
|
* do not copy the full number of backups at this time. The resize
|
|
* which changed s_groups_count will backup again.
|
|
*/
|
|
static void update_backups(struct super_block *sb, sector_t blk_off, char *data,
|
|
int size, int meta_bg)
|
|
{
|
|
struct ext4_sb_info *sbi = EXT4_SB(sb);
|
|
ext4_group_t last;
|
|
const int bpg = EXT4_BLOCKS_PER_GROUP(sb);
|
|
unsigned three = 1;
|
|
unsigned five = 5;
|
|
unsigned seven = 7;
|
|
ext4_group_t group = 0;
|
|
int rest = sb->s_blocksize - size;
|
|
handle_t *handle;
|
|
int err = 0, err2;
|
|
|
|
handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, EXT4_MAX_TRANS_DATA);
|
|
if (IS_ERR(handle)) {
|
|
group = 1;
|
|
err = PTR_ERR(handle);
|
|
goto exit_err;
|
|
}
|
|
|
|
if (meta_bg == 0) {
|
|
group = ext4_list_backups(sb, &three, &five, &seven);
|
|
last = sbi->s_groups_count;
|
|
} else {
|
|
group = ext4_get_group_number(sb, blk_off) + 1;
|
|
last = (ext4_group_t)(group + EXT4_DESC_PER_BLOCK(sb) - 2);
|
|
}
|
|
|
|
while (group < sbi->s_groups_count) {
|
|
struct buffer_head *bh;
|
|
ext4_fsblk_t backup_block;
|
|
|
|
/* Out of journal space, and can't get more - abort - so sad */
|
|
if (ext4_handle_valid(handle) &&
|
|
handle->h_buffer_credits == 0 &&
|
|
ext4_journal_extend(handle, EXT4_MAX_TRANS_DATA) &&
|
|
(err = ext4_journal_restart(handle, EXT4_MAX_TRANS_DATA)))
|
|
break;
|
|
|
|
if (meta_bg == 0)
|
|
backup_block = ((ext4_fsblk_t)group) * bpg + blk_off;
|
|
else
|
|
backup_block = (ext4_group_first_block_no(sb, group) +
|
|
ext4_bg_has_super(sb, group));
|
|
|
|
bh = sb_getblk(sb, backup_block);
|
|
if (unlikely(!bh)) {
|
|
err = -ENOMEM;
|
|
break;
|
|
}
|
|
ext4_debug("update metadata backup %llu(+%llu)\n",
|
|
backup_block, backup_block -
|
|
ext4_group_first_block_no(sb, group));
|
|
BUFFER_TRACE(bh, "get_write_access");
|
|
if ((err = ext4_journal_get_write_access(handle, bh)))
|
|
break;
|
|
lock_buffer(bh);
|
|
memcpy(bh->b_data, data, size);
|
|
if (rest)
|
|
memset(bh->b_data + size, 0, rest);
|
|
set_buffer_uptodate(bh);
|
|
unlock_buffer(bh);
|
|
err = ext4_handle_dirty_metadata(handle, NULL, bh);
|
|
if (unlikely(err))
|
|
ext4_std_error(sb, err);
|
|
brelse(bh);
|
|
|
|
if (meta_bg == 0)
|
|
group = ext4_list_backups(sb, &three, &five, &seven);
|
|
else if (group == last)
|
|
break;
|
|
else
|
|
group = last;
|
|
}
|
|
if ((err2 = ext4_journal_stop(handle)) && !err)
|
|
err = err2;
|
|
|
|
/*
|
|
* Ugh! Need to have e2fsck write the backup copies. It is too
|
|
* late to revert the resize, we shouldn't fail just because of
|
|
* the backup copies (they are only needed in case of corruption).
|
|
*
|
|
* However, if we got here we have a journal problem too, so we
|
|
* can't really start a transaction to mark the superblock.
|
|
* Chicken out and just set the flag on the hope it will be written
|
|
* to disk, and if not - we will simply wait until next fsck.
|
|
*/
|
|
exit_err:
|
|
if (err) {
|
|
ext4_warning(sb, "can't update backup for group %u (err %d), "
|
|
"forcing fsck on next reboot", group, err);
|
|
sbi->s_mount_state &= ~EXT4_VALID_FS;
|
|
sbi->s_es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
|
|
mark_buffer_dirty(sbi->s_sbh);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* ext4_add_new_descs() adds @count group descriptor of groups
|
|
* starting at @group
|
|
*
|
|
* @handle: journal handle
|
|
* @sb: super block
|
|
* @group: the group no. of the first group desc to be added
|
|
* @resize_inode: the resize inode
|
|
* @count: number of group descriptors to be added
|
|
*/
|
|
static int ext4_add_new_descs(handle_t *handle, struct super_block *sb,
|
|
ext4_group_t group, struct inode *resize_inode,
|
|
ext4_group_t count)
|
|
{
|
|
struct ext4_sb_info *sbi = EXT4_SB(sb);
|
|
struct ext4_super_block *es = sbi->s_es;
|
|
struct buffer_head *gdb_bh;
|
|
int i, gdb_off, gdb_num, err = 0;
|
|
int meta_bg;
|
|
|
|
meta_bg = ext4_has_feature_meta_bg(sb);
|
|
for (i = 0; i < count; i++, group++) {
|
|
int reserved_gdb = ext4_bg_has_super(sb, group) ?
|
|
le16_to_cpu(es->s_reserved_gdt_blocks) : 0;
|
|
|
|
gdb_off = group % EXT4_DESC_PER_BLOCK(sb);
|
|
gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
|
|
|
|
/*
|
|
* We will only either add reserved group blocks to a backup group
|
|
* or remove reserved blocks for the first group in a new group block.
|
|
* Doing both would be mean more complex code, and sane people don't
|
|
* use non-sparse filesystems anymore. This is already checked above.
|
|
*/
|
|
if (gdb_off) {
|
|
gdb_bh = sbi->s_group_desc[gdb_num];
|
|
BUFFER_TRACE(gdb_bh, "get_write_access");
|
|
err = ext4_journal_get_write_access(handle, gdb_bh);
|
|
|
|
if (!err && reserved_gdb && ext4_bg_num_gdb(sb, group))
|
|
err = reserve_backup_gdb(handle, resize_inode, group);
|
|
} else if (meta_bg != 0) {
|
|
err = add_new_gdb_meta_bg(sb, handle, group);
|
|
} else {
|
|
err = add_new_gdb(handle, resize_inode, group);
|
|
}
|
|
if (err)
|
|
break;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static struct buffer_head *ext4_get_bitmap(struct super_block *sb, __u64 block)
|
|
{
|
|
struct buffer_head *bh = sb_getblk(sb, block);
|
|
if (unlikely(!bh))
|
|
return NULL;
|
|
if (!bh_uptodate_or_lock(bh)) {
|
|
if (bh_submit_read(bh) < 0) {
|
|
brelse(bh);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
return bh;
|
|
}
|
|
|
|
static int ext4_set_bitmap_checksums(struct super_block *sb,
|
|
ext4_group_t group,
|
|
struct ext4_group_desc *gdp,
|
|
struct ext4_new_group_data *group_data)
|
|
{
|
|
struct buffer_head *bh;
|
|
|
|
if (!ext4_has_metadata_csum(sb))
|
|
return 0;
|
|
|
|
bh = ext4_get_bitmap(sb, group_data->inode_bitmap);
|
|
if (!bh)
|
|
return -EIO;
|
|
ext4_inode_bitmap_csum_set(sb, group, gdp, bh,
|
|
EXT4_INODES_PER_GROUP(sb) / 8);
|
|
brelse(bh);
|
|
|
|
bh = ext4_get_bitmap(sb, group_data->block_bitmap);
|
|
if (!bh)
|
|
return -EIO;
|
|
ext4_block_bitmap_csum_set(sb, group, gdp, bh);
|
|
brelse(bh);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* ext4_setup_new_descs() will set up the group descriptor descriptors of a flex bg
|
|
*/
|
|
static int ext4_setup_new_descs(handle_t *handle, struct super_block *sb,
|
|
struct ext4_new_flex_group_data *flex_gd)
|
|
{
|
|
struct ext4_new_group_data *group_data = flex_gd->groups;
|
|
struct ext4_group_desc *gdp;
|
|
struct ext4_sb_info *sbi = EXT4_SB(sb);
|
|
struct buffer_head *gdb_bh;
|
|
ext4_group_t group;
|
|
__u16 *bg_flags = flex_gd->bg_flags;
|
|
int i, gdb_off, gdb_num, err = 0;
|
|
|
|
|
|
for (i = 0; i < flex_gd->count; i++, group_data++, bg_flags++) {
|
|
group = group_data->group;
|
|
|
|
gdb_off = group % EXT4_DESC_PER_BLOCK(sb);
|
|
gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
|
|
|
|
/*
|
|
* get_write_access() has been called on gdb_bh by ext4_add_new_desc().
|
|
*/
|
|
gdb_bh = sbi->s_group_desc[gdb_num];
|
|
/* Update group descriptor block for new group */
|
|
gdp = (struct ext4_group_desc *)(gdb_bh->b_data +
|
|
gdb_off * EXT4_DESC_SIZE(sb));
|
|
|
|
memset(gdp, 0, EXT4_DESC_SIZE(sb));
|
|
ext4_block_bitmap_set(sb, gdp, group_data->block_bitmap);
|
|
ext4_inode_bitmap_set(sb, gdp, group_data->inode_bitmap);
|
|
err = ext4_set_bitmap_checksums(sb, group, gdp, group_data);
|
|
if (err) {
|
|
ext4_std_error(sb, err);
|
|
break;
|
|
}
|
|
|
|
ext4_inode_table_set(sb, gdp, group_data->inode_table);
|
|
ext4_free_group_clusters_set(sb, gdp,
|
|
group_data->free_clusters_count);
|
|
ext4_free_inodes_set(sb, gdp, EXT4_INODES_PER_GROUP(sb));
|
|
if (ext4_has_group_desc_csum(sb))
|
|
ext4_itable_unused_set(sb, gdp,
|
|
EXT4_INODES_PER_GROUP(sb));
|
|
gdp->bg_flags = cpu_to_le16(*bg_flags);
|
|
ext4_group_desc_csum_set(sb, group, gdp);
|
|
|
|
err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh);
|
|
if (unlikely(err)) {
|
|
ext4_std_error(sb, err);
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* We can allocate memory for mb_alloc based on the new group
|
|
* descriptor
|
|
*/
|
|
err = ext4_mb_add_groupinfo(sb, group, gdp);
|
|
if (err)
|
|
break;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* ext4_update_super() updates the super block so that the newly added
|
|
* groups can be seen by the filesystem.
|
|
*
|
|
* @sb: super block
|
|
* @flex_gd: new added groups
|
|
*/
|
|
static void ext4_update_super(struct super_block *sb,
|
|
struct ext4_new_flex_group_data *flex_gd)
|
|
{
|
|
ext4_fsblk_t blocks_count = 0;
|
|
ext4_fsblk_t free_blocks = 0;
|
|
ext4_fsblk_t reserved_blocks = 0;
|
|
struct ext4_new_group_data *group_data = flex_gd->groups;
|
|
struct ext4_sb_info *sbi = EXT4_SB(sb);
|
|
struct ext4_super_block *es = sbi->s_es;
|
|
int i;
|
|
|
|
BUG_ON(flex_gd->count == 0 || group_data == NULL);
|
|
/*
|
|
* Make the new blocks and inodes valid next. We do this before
|
|
* increasing the group count so that once the group is enabled,
|
|
* all of its blocks and inodes are already valid.
|
|
*
|
|
* We always allocate group-by-group, then block-by-block or
|
|
* inode-by-inode within a group, so enabling these
|
|
* blocks/inodes before the group is live won't actually let us
|
|
* allocate the new space yet.
|
|
*/
|
|
for (i = 0; i < flex_gd->count; i++) {
|
|
blocks_count += group_data[i].blocks_count;
|
|
free_blocks += EXT4_C2B(sbi, group_data[i].free_clusters_count);
|
|
}
|
|
|
|
reserved_blocks = ext4_r_blocks_count(es) * 100;
|
|
reserved_blocks = div64_u64(reserved_blocks, ext4_blocks_count(es));
|
|
reserved_blocks *= blocks_count;
|
|
do_div(reserved_blocks, 100);
|
|
|
|
ext4_blocks_count_set(es, ext4_blocks_count(es) + blocks_count);
|
|
ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + free_blocks);
|
|
le32_add_cpu(&es->s_inodes_count, EXT4_INODES_PER_GROUP(sb) *
|
|
flex_gd->count);
|
|
le32_add_cpu(&es->s_free_inodes_count, EXT4_INODES_PER_GROUP(sb) *
|
|
flex_gd->count);
|
|
|
|
ext4_debug("free blocks count %llu", ext4_free_blocks_count(es));
|
|
/*
|
|
* We need to protect s_groups_count against other CPUs seeing
|
|
* inconsistent state in the superblock.
|
|
*
|
|
* The precise rules we use are:
|
|
*
|
|
* * Writers must perform a smp_wmb() after updating all
|
|
* dependent data and before modifying the groups count
|
|
*
|
|
* * Readers must perform an smp_rmb() after reading the groups
|
|
* count and before reading any dependent data.
|
|
*
|
|
* NB. These rules can be relaxed when checking the group count
|
|
* while freeing data, as we can only allocate from a block
|
|
* group after serialising against the group count, and we can
|
|
* only then free after serialising in turn against that
|
|
* allocation.
|
|
*/
|
|
smp_wmb();
|
|
|
|
/* Update the global fs size fields */
|
|
sbi->s_groups_count += flex_gd->count;
|
|
sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
|
|
(EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
|
|
|
|
/* Update the reserved block counts only once the new group is
|
|
* active. */
|
|
ext4_r_blocks_count_set(es, ext4_r_blocks_count(es) +
|
|
reserved_blocks);
|
|
|
|
/* Update the free space counts */
|
|
percpu_counter_add(&sbi->s_freeclusters_counter,
|
|
EXT4_NUM_B2C(sbi, free_blocks));
|
|
percpu_counter_add(&sbi->s_freeinodes_counter,
|
|
EXT4_INODES_PER_GROUP(sb) * flex_gd->count);
|
|
|
|
ext4_debug("free blocks count %llu",
|
|
percpu_counter_read(&sbi->s_freeclusters_counter));
|
|
if (ext4_has_feature_flex_bg(sb) && sbi->s_log_groups_per_flex) {
|
|
ext4_group_t flex_group;
|
|
flex_group = ext4_flex_group(sbi, group_data[0].group);
|
|
atomic64_add(EXT4_NUM_B2C(sbi, free_blocks),
|
|
&sbi->s_flex_groups[flex_group].free_clusters);
|
|
atomic_add(EXT4_INODES_PER_GROUP(sb) * flex_gd->count,
|
|
&sbi->s_flex_groups[flex_group].free_inodes);
|
|
}
|
|
|
|
/*
|
|
* Update the fs overhead information
|
|
*/
|
|
ext4_calculate_overhead(sb);
|
|
|
|
if (test_opt(sb, DEBUG))
|
|
printk(KERN_DEBUG "EXT4-fs: added group %u:"
|
|
"%llu blocks(%llu free %llu reserved)\n", flex_gd->count,
|
|
blocks_count, free_blocks, reserved_blocks);
|
|
}
|
|
|
|
/* Add a flex group to an fs. Ensure we handle all possible error conditions
|
|
* _before_ we start modifying the filesystem, because we cannot abort the
|
|
* transaction and not have it write the data to disk.
|
|
*/
|
|
static int ext4_flex_group_add(struct super_block *sb,
|
|
struct inode *resize_inode,
|
|
struct ext4_new_flex_group_data *flex_gd)
|
|
{
|
|
struct ext4_sb_info *sbi = EXT4_SB(sb);
|
|
struct ext4_super_block *es = sbi->s_es;
|
|
ext4_fsblk_t o_blocks_count;
|
|
ext4_grpblk_t last;
|
|
ext4_group_t group;
|
|
handle_t *handle;
|
|
unsigned reserved_gdb;
|
|
int err = 0, err2 = 0, credit;
|
|
|
|
BUG_ON(!flex_gd->count || !flex_gd->groups || !flex_gd->bg_flags);
|
|
|
|
reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks);
|
|
o_blocks_count = ext4_blocks_count(es);
|
|
ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last);
|
|
BUG_ON(last);
|
|
|
|
err = setup_new_flex_group_blocks(sb, flex_gd);
|
|
if (err)
|
|
goto exit;
|
|
/*
|
|
* We will always be modifying at least the superblock and GDT
|
|
* blocks. If we are adding a group past the last current GDT block,
|
|
* we will also modify the inode and the dindirect block. If we
|
|
* are adding a group with superblock/GDT backups we will also
|
|
* modify each of the reserved GDT dindirect blocks.
|
|
*/
|
|
credit = 3; /* sb, resize inode, resize inode dindirect */
|
|
/* GDT blocks */
|
|
credit += 1 + DIV_ROUND_UP(flex_gd->count, EXT4_DESC_PER_BLOCK(sb));
|
|
credit += reserved_gdb; /* Reserved GDT dindirect blocks */
|
|
handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, credit);
|
|
if (IS_ERR(handle)) {
|
|
err = PTR_ERR(handle);
|
|
goto exit;
|
|
}
|
|
|
|
BUFFER_TRACE(sbi->s_sbh, "get_write_access");
|
|
err = ext4_journal_get_write_access(handle, sbi->s_sbh);
|
|
if (err)
|
|
goto exit_journal;
|
|
|
|
group = flex_gd->groups[0].group;
|
|
BUG_ON(group != sbi->s_groups_count);
|
|
err = ext4_add_new_descs(handle, sb, group,
|
|
resize_inode, flex_gd->count);
|
|
if (err)
|
|
goto exit_journal;
|
|
|
|
err = ext4_setup_new_descs(handle, sb, flex_gd);
|
|
if (err)
|
|
goto exit_journal;
|
|
|
|
ext4_update_super(sb, flex_gd);
|
|
|
|
err = ext4_handle_dirty_super(handle, sb);
|
|
|
|
exit_journal:
|
|
err2 = ext4_journal_stop(handle);
|
|
if (!err)
|
|
err = err2;
|
|
|
|
if (!err) {
|
|
int gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
|
|
int gdb_num_end = ((group + flex_gd->count - 1) /
|
|
EXT4_DESC_PER_BLOCK(sb));
|
|
int meta_bg = ext4_has_feature_meta_bg(sb);
|
|
sector_t old_gdb = 0;
|
|
|
|
update_backups(sb, sbi->s_sbh->b_blocknr, (char *)es,
|
|
sizeof(struct ext4_super_block), 0);
|
|
for (; gdb_num <= gdb_num_end; gdb_num++) {
|
|
struct buffer_head *gdb_bh;
|
|
|
|
gdb_bh = sbi->s_group_desc[gdb_num];
|
|
if (old_gdb == gdb_bh->b_blocknr)
|
|
continue;
|
|
update_backups(sb, gdb_bh->b_blocknr, gdb_bh->b_data,
|
|
gdb_bh->b_size, meta_bg);
|
|
old_gdb = gdb_bh->b_blocknr;
|
|
}
|
|
}
|
|
exit:
|
|
return err;
|
|
}
|
|
|
|
static int ext4_setup_next_flex_gd(struct super_block *sb,
|
|
struct ext4_new_flex_group_data *flex_gd,
|
|
ext4_fsblk_t n_blocks_count,
|
|
unsigned long flexbg_size)
|
|
{
|
|
struct ext4_sb_info *sbi = EXT4_SB(sb);
|
|
struct ext4_super_block *es = sbi->s_es;
|
|
struct ext4_new_group_data *group_data = flex_gd->groups;
|
|
ext4_fsblk_t o_blocks_count;
|
|
ext4_group_t n_group;
|
|
ext4_group_t group;
|
|
ext4_group_t last_group;
|
|
ext4_grpblk_t last;
|
|
ext4_grpblk_t clusters_per_group;
|
|
unsigned long i;
|
|
|
|
clusters_per_group = EXT4_CLUSTERS_PER_GROUP(sb);
|
|
|
|
o_blocks_count = ext4_blocks_count(es);
|
|
|
|
if (o_blocks_count == n_blocks_count)
|
|
return 0;
|
|
|
|
ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last);
|
|
BUG_ON(last);
|
|
ext4_get_group_no_and_offset(sb, n_blocks_count - 1, &n_group, &last);
|
|
|
|
last_group = group | (flexbg_size - 1);
|
|
if (last_group > n_group)
|
|
last_group = n_group;
|
|
|
|
flex_gd->count = last_group - group + 1;
|
|
|
|
for (i = 0; i < flex_gd->count; i++) {
|
|
int overhead;
|
|
|
|
group_data[i].group = group + i;
|
|
group_data[i].blocks_count = EXT4_BLOCKS_PER_GROUP(sb);
|
|
overhead = ext4_group_overhead_blocks(sb, group + i);
|
|
group_data[i].mdata_blocks = overhead;
|
|
group_data[i].free_clusters_count = EXT4_CLUSTERS_PER_GROUP(sb);
|
|
if (ext4_has_group_desc_csum(sb)) {
|
|
flex_gd->bg_flags[i] = EXT4_BG_BLOCK_UNINIT |
|
|
EXT4_BG_INODE_UNINIT;
|
|
if (!test_opt(sb, INIT_INODE_TABLE))
|
|
flex_gd->bg_flags[i] |= EXT4_BG_INODE_ZEROED;
|
|
} else
|
|
flex_gd->bg_flags[i] = EXT4_BG_INODE_ZEROED;
|
|
}
|
|
|
|
if (last_group == n_group && ext4_has_group_desc_csum(sb))
|
|
/* We need to initialize block bitmap of last group. */
|
|
flex_gd->bg_flags[i - 1] &= ~EXT4_BG_BLOCK_UNINIT;
|
|
|
|
if ((last_group == n_group) && (last != clusters_per_group - 1)) {
|
|
group_data[i - 1].blocks_count = EXT4_C2B(sbi, last + 1);
|
|
group_data[i - 1].free_clusters_count -= clusters_per_group -
|
|
last - 1;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* Add group descriptor data to an existing or new group descriptor block.
|
|
* Ensure we handle all possible error conditions _before_ we start modifying
|
|
* the filesystem, because we cannot abort the transaction and not have it
|
|
* write the data to disk.
|
|
*
|
|
* If we are on a GDT block boundary, we need to get the reserved GDT block.
|
|
* Otherwise, we may need to add backup GDT blocks for a sparse group.
|
|
*
|
|
* We only need to hold the superblock lock while we are actually adding
|
|
* in the new group's counts to the superblock. Prior to that we have
|
|
* not really "added" the group at all. We re-check that we are still
|
|
* adding in the last group in case things have changed since verifying.
|
|
*/
|
|
int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input)
|
|
{
|
|
struct ext4_new_flex_group_data flex_gd;
|
|
struct ext4_sb_info *sbi = EXT4_SB(sb);
|
|
struct ext4_super_block *es = sbi->s_es;
|
|
int reserved_gdb = ext4_bg_has_super(sb, input->group) ?
|
|
le16_to_cpu(es->s_reserved_gdt_blocks) : 0;
|
|
struct inode *inode = NULL;
|
|
int gdb_off;
|
|
int err;
|
|
__u16 bg_flags = 0;
|
|
|
|
gdb_off = input->group % EXT4_DESC_PER_BLOCK(sb);
|
|
|
|
if (gdb_off == 0 && !ext4_has_feature_sparse_super(sb)) {
|
|
ext4_warning(sb, "Can't resize non-sparse filesystem further");
|
|
return -EPERM;
|
|
}
|
|
|
|
if (ext4_blocks_count(es) + input->blocks_count <
|
|
ext4_blocks_count(es)) {
|
|
ext4_warning(sb, "blocks_count overflow");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (le32_to_cpu(es->s_inodes_count) + EXT4_INODES_PER_GROUP(sb) <
|
|
le32_to_cpu(es->s_inodes_count)) {
|
|
ext4_warning(sb, "inodes_count overflow");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (reserved_gdb || gdb_off == 0) {
|
|
if (ext4_has_feature_resize_inode(sb) ||
|
|
!le16_to_cpu(es->s_reserved_gdt_blocks)) {
|
|
ext4_warning(sb,
|
|
"No reserved GDT blocks, can't resize");
|
|
return -EPERM;
|
|
}
|
|
inode = ext4_iget(sb, EXT4_RESIZE_INO);
|
|
if (IS_ERR(inode)) {
|
|
ext4_warning(sb, "Error opening resize inode");
|
|
return PTR_ERR(inode);
|
|
}
|
|
}
|
|
|
|
|
|
err = verify_group_input(sb, input);
|
|
if (err)
|
|
goto out;
|
|
|
|
err = ext4_alloc_flex_bg_array(sb, input->group + 1);
|
|
if (err)
|
|
goto out;
|
|
|
|
err = ext4_mb_alloc_groupinfo(sb, input->group + 1);
|
|
if (err)
|
|
goto out;
|
|
|
|
flex_gd.count = 1;
|
|
flex_gd.groups = input;
|
|
flex_gd.bg_flags = &bg_flags;
|
|
err = ext4_flex_group_add(sb, inode, &flex_gd);
|
|
out:
|
|
iput(inode);
|
|
return err;
|
|
} /* ext4_group_add */
|
|
|
|
/*
|
|
* extend a group without checking assuming that checking has been done.
|
|
*/
|
|
static int ext4_group_extend_no_check(struct super_block *sb,
|
|
ext4_fsblk_t o_blocks_count, ext4_grpblk_t add)
|
|
{
|
|
struct ext4_super_block *es = EXT4_SB(sb)->s_es;
|
|
handle_t *handle;
|
|
int err = 0, err2;
|
|
|
|
/* We will update the superblock, one block bitmap, and
|
|
* one group descriptor via ext4_group_add_blocks().
|
|
*/
|
|
handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, 3);
|
|
if (IS_ERR(handle)) {
|
|
err = PTR_ERR(handle);
|
|
ext4_warning(sb, "error %d on journal start", err);
|
|
return err;
|
|
}
|
|
|
|
BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access");
|
|
err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh);
|
|
if (err) {
|
|
ext4_warning(sb, "error %d on journal write access", err);
|
|
goto errout;
|
|
}
|
|
|
|
ext4_blocks_count_set(es, o_blocks_count + add);
|
|
ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + add);
|
|
ext4_debug("freeing blocks %llu through %llu\n", o_blocks_count,
|
|
o_blocks_count + add);
|
|
/* We add the blocks to the bitmap and set the group need init bit */
|
|
err = ext4_group_add_blocks(handle, sb, o_blocks_count, add);
|
|
if (err)
|
|
goto errout;
|
|
ext4_handle_dirty_super(handle, sb);
|
|
ext4_debug("freed blocks %llu through %llu\n", o_blocks_count,
|
|
o_blocks_count + add);
|
|
errout:
|
|
err2 = ext4_journal_stop(handle);
|
|
if (err2 && !err)
|
|
err = err2;
|
|
|
|
if (!err) {
|
|
if (test_opt(sb, DEBUG))
|
|
printk(KERN_DEBUG "EXT4-fs: extended group to %llu "
|
|
"blocks\n", ext4_blocks_count(es));
|
|
update_backups(sb, EXT4_SB(sb)->s_sbh->b_blocknr,
|
|
(char *)es, sizeof(struct ext4_super_block), 0);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Extend the filesystem to the new number of blocks specified. This entry
|
|
* point is only used to extend the current filesystem to the end of the last
|
|
* existing group. It can be accessed via ioctl, or by "remount,resize=<size>"
|
|
* for emergencies (because it has no dependencies on reserved blocks).
|
|
*
|
|
* If we _really_ wanted, we could use default values to call ext4_group_add()
|
|
* allow the "remount" trick to work for arbitrary resizing, assuming enough
|
|
* GDT blocks are reserved to grow to the desired size.
|
|
*/
|
|
int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es,
|
|
ext4_fsblk_t n_blocks_count)
|
|
{
|
|
ext4_fsblk_t o_blocks_count;
|
|
ext4_grpblk_t last;
|
|
ext4_grpblk_t add;
|
|
struct buffer_head *bh;
|
|
int err;
|
|
ext4_group_t group;
|
|
|
|
o_blocks_count = ext4_blocks_count(es);
|
|
|
|
if (test_opt(sb, DEBUG))
|
|
ext4_msg(sb, KERN_DEBUG,
|
|
"extending last group from %llu to %llu blocks",
|
|
o_blocks_count, n_blocks_count);
|
|
|
|
if (n_blocks_count == 0 || n_blocks_count == o_blocks_count)
|
|
return 0;
|
|
|
|
if (n_blocks_count > (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
|
|
ext4_msg(sb, KERN_ERR,
|
|
"filesystem too large to resize to %llu blocks safely",
|
|
n_blocks_count);
|
|
if (sizeof(sector_t) < 8)
|
|
ext4_warning(sb, "CONFIG_LBDAF not enabled");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (n_blocks_count < o_blocks_count) {
|
|
ext4_warning(sb, "can't shrink FS - resize aborted");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Handle the remaining blocks in the last group only. */
|
|
ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last);
|
|
|
|
if (last == 0) {
|
|
ext4_warning(sb, "need to use ext2online to resize further");
|
|
return -EPERM;
|
|
}
|
|
|
|
add = EXT4_BLOCKS_PER_GROUP(sb) - last;
|
|
|
|
if (o_blocks_count + add < o_blocks_count) {
|
|
ext4_warning(sb, "blocks_count overflow");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (o_blocks_count + add > n_blocks_count)
|
|
add = n_blocks_count - o_blocks_count;
|
|
|
|
if (o_blocks_count + add < n_blocks_count)
|
|
ext4_warning(sb, "will only finish group (%llu blocks, %u new)",
|
|
o_blocks_count + add, add);
|
|
|
|
/* See if the device is actually as big as what was requested */
|
|
bh = sb_bread(sb, o_blocks_count + add - 1);
|
|
if (!bh) {
|
|
ext4_warning(sb, "can't read last block, resize aborted");
|
|
return -ENOSPC;
|
|
}
|
|
brelse(bh);
|
|
|
|
err = ext4_group_extend_no_check(sb, o_blocks_count, add);
|
|
return err;
|
|
} /* ext4_group_extend */
|
|
|
|
|
|
static int num_desc_blocks(struct super_block *sb, ext4_group_t groups)
|
|
{
|
|
return (groups + EXT4_DESC_PER_BLOCK(sb) - 1) / EXT4_DESC_PER_BLOCK(sb);
|
|
}
|
|
|
|
/*
|
|
* Release the resize inode and drop the resize_inode feature if there
|
|
* are no more reserved gdt blocks, and then convert the file system
|
|
* to enable meta_bg
|
|
*/
|
|
static int ext4_convert_meta_bg(struct super_block *sb, struct inode *inode)
|
|
{
|
|
handle_t *handle;
|
|
struct ext4_sb_info *sbi = EXT4_SB(sb);
|
|
struct ext4_super_block *es = sbi->s_es;
|
|
struct ext4_inode_info *ei = EXT4_I(inode);
|
|
ext4_fsblk_t nr;
|
|
int i, ret, err = 0;
|
|
int credits = 1;
|
|
|
|
ext4_msg(sb, KERN_INFO, "Converting file system to meta_bg");
|
|
if (inode) {
|
|
if (es->s_reserved_gdt_blocks) {
|
|
ext4_error(sb, "Unexpected non-zero "
|
|
"s_reserved_gdt_blocks");
|
|
return -EPERM;
|
|
}
|
|
|
|
/* Do a quick sanity check of the resize inode */
|
|
if (inode->i_blocks != 1 << (inode->i_blkbits -
|
|
(9 - sbi->s_cluster_bits)))
|
|
goto invalid_resize_inode;
|
|
for (i = 0; i < EXT4_N_BLOCKS; i++) {
|
|
if (i == EXT4_DIND_BLOCK) {
|
|
if (ei->i_data[i])
|
|
continue;
|
|
else
|
|
goto invalid_resize_inode;
|
|
}
|
|
if (ei->i_data[i])
|
|
goto invalid_resize_inode;
|
|
}
|
|
credits += 3; /* block bitmap, bg descriptor, resize inode */
|
|
}
|
|
|
|
handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, credits);
|
|
if (IS_ERR(handle))
|
|
return PTR_ERR(handle);
|
|
|
|
BUFFER_TRACE(sbi->s_sbh, "get_write_access");
|
|
err = ext4_journal_get_write_access(handle, sbi->s_sbh);
|
|
if (err)
|
|
goto errout;
|
|
|
|
ext4_clear_feature_resize_inode(sb);
|
|
ext4_set_feature_meta_bg(sb);
|
|
sbi->s_es->s_first_meta_bg =
|
|
cpu_to_le32(num_desc_blocks(sb, sbi->s_groups_count));
|
|
|
|
err = ext4_handle_dirty_super(handle, sb);
|
|
if (err) {
|
|
ext4_std_error(sb, err);
|
|
goto errout;
|
|
}
|
|
|
|
if (inode) {
|
|
nr = le32_to_cpu(ei->i_data[EXT4_DIND_BLOCK]);
|
|
ext4_free_blocks(handle, inode, NULL, nr, 1,
|
|
EXT4_FREE_BLOCKS_METADATA |
|
|
EXT4_FREE_BLOCKS_FORGET);
|
|
ei->i_data[EXT4_DIND_BLOCK] = 0;
|
|
inode->i_blocks = 0;
|
|
|
|
err = ext4_mark_inode_dirty(handle, inode);
|
|
if (err)
|
|
ext4_std_error(sb, err);
|
|
}
|
|
|
|
errout:
|
|
ret = ext4_journal_stop(handle);
|
|
if (!err)
|
|
err = ret;
|
|
return ret;
|
|
|
|
invalid_resize_inode:
|
|
ext4_error(sb, "corrupted/inconsistent resize inode");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* ext4_resize_fs() resizes a fs to new size specified by @n_blocks_count
|
|
*
|
|
* @sb: super block of the fs to be resized
|
|
* @n_blocks_count: the number of blocks resides in the resized fs
|
|
*/
|
|
int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count)
|
|
{
|
|
struct ext4_new_flex_group_data *flex_gd = NULL;
|
|
struct ext4_sb_info *sbi = EXT4_SB(sb);
|
|
struct ext4_super_block *es = sbi->s_es;
|
|
struct buffer_head *bh;
|
|
struct inode *resize_inode = NULL;
|
|
ext4_grpblk_t add, offset;
|
|
unsigned long n_desc_blocks;
|
|
unsigned long o_desc_blocks;
|
|
ext4_group_t o_group;
|
|
ext4_group_t n_group;
|
|
ext4_fsblk_t o_blocks_count;
|
|
ext4_fsblk_t n_blocks_count_retry = 0;
|
|
unsigned long last_update_time = 0;
|
|
int err = 0, flexbg_size = 1 << sbi->s_log_groups_per_flex;
|
|
int meta_bg;
|
|
|
|
/* See if the device is actually as big as what was requested */
|
|
bh = sb_bread(sb, n_blocks_count - 1);
|
|
if (!bh) {
|
|
ext4_warning(sb, "can't read last block, resize aborted");
|
|
return -ENOSPC;
|
|
}
|
|
brelse(bh);
|
|
|
|
retry:
|
|
o_blocks_count = ext4_blocks_count(es);
|
|
|
|
ext4_msg(sb, KERN_INFO, "resizing filesystem from %llu "
|
|
"to %llu blocks", o_blocks_count, n_blocks_count);
|
|
|
|
if (n_blocks_count < o_blocks_count) {
|
|
/* On-line shrinking not supported */
|
|
ext4_warning(sb, "can't shrink FS - resize aborted");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (n_blocks_count == o_blocks_count)
|
|
/* Nothing need to do */
|
|
return 0;
|
|
|
|
n_group = ext4_get_group_number(sb, n_blocks_count - 1);
|
|
if (n_group >= (0xFFFFFFFFUL / EXT4_INODES_PER_GROUP(sb))) {
|
|
ext4_warning(sb, "resize would cause inodes_count overflow");
|
|
return -EINVAL;
|
|
}
|
|
ext4_get_group_no_and_offset(sb, o_blocks_count - 1, &o_group, &offset);
|
|
|
|
n_desc_blocks = num_desc_blocks(sb, n_group + 1);
|
|
o_desc_blocks = num_desc_blocks(sb, sbi->s_groups_count);
|
|
|
|
meta_bg = ext4_has_feature_meta_bg(sb);
|
|
|
|
if (ext4_has_feature_resize_inode(sb)) {
|
|
if (meta_bg) {
|
|
ext4_error(sb, "resize_inode and meta_bg enabled "
|
|
"simultaneously");
|
|
return -EINVAL;
|
|
}
|
|
if (n_desc_blocks > o_desc_blocks +
|
|
le16_to_cpu(es->s_reserved_gdt_blocks)) {
|
|
n_blocks_count_retry = n_blocks_count;
|
|
n_desc_blocks = o_desc_blocks +
|
|
le16_to_cpu(es->s_reserved_gdt_blocks);
|
|
n_group = n_desc_blocks * EXT4_DESC_PER_BLOCK(sb);
|
|
n_blocks_count = (ext4_fsblk_t)n_group *
|
|
EXT4_BLOCKS_PER_GROUP(sb);
|
|
n_group--; /* set to last group number */
|
|
}
|
|
|
|
if (!resize_inode)
|
|
resize_inode = ext4_iget(sb, EXT4_RESIZE_INO);
|
|
if (IS_ERR(resize_inode)) {
|
|
ext4_warning(sb, "Error opening resize inode");
|
|
return PTR_ERR(resize_inode);
|
|
}
|
|
}
|
|
|
|
if ((!resize_inode && !meta_bg) || n_blocks_count == o_blocks_count) {
|
|
err = ext4_convert_meta_bg(sb, resize_inode);
|
|
if (err)
|
|
goto out;
|
|
if (resize_inode) {
|
|
iput(resize_inode);
|
|
resize_inode = NULL;
|
|
}
|
|
if (n_blocks_count_retry) {
|
|
n_blocks_count = n_blocks_count_retry;
|
|
n_blocks_count_retry = 0;
|
|
goto retry;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Make sure the last group has enough space so that it's
|
|
* guaranteed to have enough space for all metadata blocks
|
|
* that it might need to hold. (We might not need to store
|
|
* the inode table blocks in the last block group, but there
|
|
* will be cases where this might be needed.)
|
|
*/
|
|
if ((ext4_group_first_block_no(sb, n_group) +
|
|
ext4_group_overhead_blocks(sb, n_group) + 2 +
|
|
sbi->s_itb_per_group + sbi->s_cluster_ratio) >= n_blocks_count) {
|
|
n_blocks_count = ext4_group_first_block_no(sb, n_group);
|
|
n_group--;
|
|
n_blocks_count_retry = 0;
|
|
if (resize_inode) {
|
|
iput(resize_inode);
|
|
resize_inode = NULL;
|
|
}
|
|
goto retry;
|
|
}
|
|
|
|
/* extend the last group */
|
|
if (n_group == o_group)
|
|
add = n_blocks_count - o_blocks_count;
|
|
else
|
|
add = EXT4_C2B(sbi, EXT4_CLUSTERS_PER_GROUP(sb) - (offset + 1));
|
|
if (add > 0) {
|
|
err = ext4_group_extend_no_check(sb, o_blocks_count, add);
|
|
if (err)
|
|
goto out;
|
|
}
|
|
|
|
if (ext4_blocks_count(es) == n_blocks_count)
|
|
goto out;
|
|
|
|
err = ext4_alloc_flex_bg_array(sb, n_group + 1);
|
|
if (err)
|
|
return err;
|
|
|
|
err = ext4_mb_alloc_groupinfo(sb, n_group + 1);
|
|
if (err)
|
|
goto out;
|
|
|
|
flex_gd = alloc_flex_gd(flexbg_size);
|
|
if (flex_gd == NULL) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
/* Add flex groups. Note that a regular group is a
|
|
* flex group with 1 group.
|
|
*/
|
|
while (ext4_setup_next_flex_gd(sb, flex_gd, n_blocks_count,
|
|
flexbg_size)) {
|
|
if (jiffies - last_update_time > HZ * 10) {
|
|
if (last_update_time)
|
|
ext4_msg(sb, KERN_INFO,
|
|
"resized to %llu blocks",
|
|
ext4_blocks_count(es));
|
|
last_update_time = jiffies;
|
|
}
|
|
if (ext4_alloc_group_tables(sb, flex_gd, flexbg_size) != 0)
|
|
break;
|
|
err = ext4_flex_group_add(sb, resize_inode, flex_gd);
|
|
if (unlikely(err))
|
|
break;
|
|
}
|
|
|
|
if (!err && n_blocks_count_retry) {
|
|
n_blocks_count = n_blocks_count_retry;
|
|
n_blocks_count_retry = 0;
|
|
free_flex_gd(flex_gd);
|
|
flex_gd = NULL;
|
|
goto retry;
|
|
}
|
|
|
|
out:
|
|
if (flex_gd)
|
|
free_flex_gd(flex_gd);
|
|
if (resize_inode != NULL)
|
|
iput(resize_inode);
|
|
ext4_msg(sb, KERN_INFO, "resized filesystem to %llu", n_blocks_count);
|
|
return err;
|
|
}
|