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ext4: add online resizing support for meta_bg and 64-bit file systems
This patch adds support for resizing file systems with the meta_bg and 64bit features. [ Added a fix by tytso to fix a divide by zero when resizing a filesystem from 14 TB to 18TB. Also fixed overhead accounting for meta_bg file systems.] Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Yongqiang Yang
Theodore Ts'o
parent
28623c2f5b
commit
01f795f9e0
@ -365,26 +365,11 @@ group_add_out:
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return -EOPNOTSUPP;
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}
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if (EXT4_HAS_INCOMPAT_FEATURE(sb,
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EXT4_FEATURE_INCOMPAT_META_BG)) {
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ext4_msg(sb, KERN_ERR,
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"Online resizing not (yet) supported with meta_bg");
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return -EOPNOTSUPP;
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}
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if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
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sizeof(__u64))) {
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return -EFAULT;
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}
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if (n_blocks_count > MAX_32_NUM &&
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!EXT4_HAS_INCOMPAT_FEATURE(sb,
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EXT4_FEATURE_INCOMPAT_64BIT)) {
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ext4_msg(sb, KERN_ERR,
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"File system only supports 32-bit block numbers");
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return -EOPNOTSUPP;
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}
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err = ext4_resize_begin(sb);
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if (err)
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return err;
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215
fs/ext4/resize.c
215
fs/ext4/resize.c
@ -45,6 +45,28 @@ void ext4_resize_end(struct super_block *sb)
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smp_mb__after_clear_bit();
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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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@ -57,9 +79,7 @@ static int verify_group_input(struct super_block *sb,
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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 = ext4_bg_has_super(sb, group) ?
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(1 + ext4_bg_num_gdb(sb, group) +
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le16_to_cpu(es->s_reserved_gdt_blocks)) : 0;
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unsigned overhead = ext4_group_overhead_blocks(sb, group);
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ext4_fsblk_t metaend = start + overhead;
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struct buffer_head *bh = NULL;
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ext4_grpblk_t free_blocks_count, offset;
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@ -209,7 +229,6 @@ static int ext4_alloc_group_tables(struct super_block *sb,
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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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struct ext4_super_block *es = EXT4_SB(sb)->s_es;
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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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@ -234,19 +253,19 @@ next_group:
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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_bg_has_super(sb, src_group) ?
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(1 + ext4_bg_num_gdb(sb, src_group) +
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le16_to_cpu(es->s_reserved_gdt_blocks)) : 0;
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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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if (!ext4_bg_has_super(sb, 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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@ -438,11 +457,13 @@ static int setup_new_flex_group_blocks(struct super_block *sb,
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ext4_group_t group, count;
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struct buffer_head *bh = NULL;
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int reserved_gdb, i, j, err = 0, err2;
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int meta_bg;
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BUG_ON(!flex_gd->count || !group_data ||
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group_data[0].group != sbi->s_groups_count);
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reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks);
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meta_bg = EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG);
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/* This transaction may be extended/restarted along the way */
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handle = ext4_journal_start_sb(sb, EXT4_MAX_TRANS_DATA);
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@ -452,15 +473,25 @@ static int setup_new_flex_group_blocks(struct super_block *sb,
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group = group_data[0].group;
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for (i = 0; i < flex_gd->count; i++, group++) {
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unsigned long gdblocks;
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ext4_grpblk_t overhead;
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gdblocks = ext4_bg_num_gdb(sb, group);
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start = ext4_group_first_block_no(sb, group);
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if (!ext4_bg_has_super(sb, group))
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if (meta_bg == 0 && !ext4_bg_has_super(sb, group))
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goto handle_itb;
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if (meta_bg == 1) {
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ext4_group_t first_group;
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first_group = ext4_meta_bg_first_group(sb, group);
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if (first_group != group + 1 &&
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first_group != group + EXT4_DESC_PER_BLOCK(sb) - 1)
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goto handle_itb;
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}
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block = start + ext4_bg_has_super(sb, group);
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/* Copy all of the GDT blocks into the backup in this group */
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for (j = 0, block = start + 1; j < gdblocks; j++, block++) {
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for (j = 0; j < gdblocks; j++, block++) {
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struct buffer_head *gdb;
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ext4_debug("update backup group %#04llx\n", block);
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@ -530,11 +561,11 @@ handle_bb:
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err = PTR_ERR(bh);
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goto out;
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}
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if (ext4_bg_has_super(sb, group)) {
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overhead = ext4_group_overhead_blocks(sb, group);
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if (overhead != 0) {
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ext4_debug("mark backup superblock %#04llx (+0)\n",
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start);
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ext4_set_bits(bh->b_data, 0, gdblocks + reserved_gdb +
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1);
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ext4_set_bits(bh->b_data, 0, overhead);
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}
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ext4_mark_bitmap_end(group_data[i].blocks_count,
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sb->s_blocksize * 8, bh->b_data);
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@ -830,6 +861,45 @@ exit_bh:
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return err;
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}
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/*
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* add_new_gdb_meta_bg is the sister of add_new_gdb.
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*/
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static int add_new_gdb_meta_bg(struct super_block *sb,
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handle_t *handle, ext4_group_t group) {
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ext4_fsblk_t gdblock;
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struct buffer_head *gdb_bh;
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struct buffer_head **o_group_desc, **n_group_desc;
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unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
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int err;
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gdblock = ext4_meta_bg_first_block_no(sb, group) +
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ext4_bg_has_super(sb, group);
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gdb_bh = sb_bread(sb, gdblock);
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if (!gdb_bh)
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return -EIO;
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n_group_desc = ext4_kvmalloc((gdb_num + 1) *
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sizeof(struct buffer_head *),
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GFP_NOFS);
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if (!n_group_desc) {
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err = -ENOMEM;
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ext4_warning(sb, "not enough memory for %lu groups",
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gdb_num + 1);
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return err;
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}
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o_group_desc = EXT4_SB(sb)->s_group_desc;
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memcpy(n_group_desc, o_group_desc,
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EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *));
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n_group_desc[gdb_num] = gdb_bh;
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EXT4_SB(sb)->s_group_desc = n_group_desc;
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EXT4_SB(sb)->s_gdb_count++;
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ext4_kvfree(o_group_desc);
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err = ext4_journal_get_write_access(handle, gdb_bh);
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if (unlikely(err))
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brelse(gdb_bh);
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return err;
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}
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/*
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* Called when we are adding a new group which has a backup copy of each of
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* the GDT blocks (i.e. sparse group) and there are reserved GDT blocks.
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@ -958,16 +1028,16 @@ exit_free:
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* do not copy the full number of backups at this time. The resize
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* which changed s_groups_count will backup again.
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*/
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static void update_backups(struct super_block *sb,
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int blk_off, char *data, int size)
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static void update_backups(struct super_block *sb, int blk_off, char *data,
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int size, int meta_bg)
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{
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struct ext4_sb_info *sbi = EXT4_SB(sb);
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const ext4_group_t last = sbi->s_groups_count;
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ext4_group_t last;
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const int bpg = EXT4_BLOCKS_PER_GROUP(sb);
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unsigned three = 1;
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unsigned five = 5;
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unsigned seven = 7;
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ext4_group_t group;
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ext4_group_t group = 0;
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int rest = sb->s_blocksize - size;
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handle_t *handle;
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int err = 0, err2;
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@ -981,8 +1051,17 @@ static void update_backups(struct super_block *sb,
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ext4_superblock_csum_set(sb, (struct ext4_super_block *)data);
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while ((group = ext4_list_backups(sb, &three, &five, &seven)) < last) {
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if (meta_bg == 0) {
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group = ext4_list_backups(sb, &three, &five, &seven);
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last = sbi->s_groups_count;
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} else {
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group = ext4_meta_bg_first_group(sb, group) + 1;
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last = (ext4_group_t)(group + EXT4_DESC_PER_BLOCK(sb) - 2);
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}
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while (group < sbi->s_groups_count) {
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struct buffer_head *bh;
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ext4_fsblk_t backup_block;
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/* Out of journal space, and can't get more - abort - so sad */
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if (ext4_handle_valid(handle) &&
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@ -991,13 +1070,20 @@ static void update_backups(struct super_block *sb,
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(err = ext4_journal_restart(handle, EXT4_MAX_TRANS_DATA)))
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break;
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bh = sb_getblk(sb, group * bpg + blk_off);
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if (meta_bg == 0)
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backup_block = group * bpg + blk_off;
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else
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backup_block = (ext4_group_first_block_no(sb, group) +
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ext4_bg_has_super(sb, group));
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bh = sb_getblk(sb, backup_block);
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if (!bh) {
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err = -EIO;
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break;
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}
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ext4_debug("update metadata backup %#04lx\n",
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(unsigned long)bh->b_blocknr);
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ext4_debug("update metadata backup %llu(+%llu)\n",
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backup_block, backup_block -
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ext4_group_first_block_no(sb, group));
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if ((err = ext4_journal_get_write_access(handle, bh)))
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break;
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lock_buffer(bh);
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@ -1010,6 +1096,13 @@ static void update_backups(struct super_block *sb,
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if (unlikely(err))
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ext4_std_error(sb, err);
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brelse(bh);
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if (meta_bg == 0)
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group = ext4_list_backups(sb, &three, &five, &seven);
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else if (group == last)
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break;
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else
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group = last;
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}
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if ((err2 = ext4_journal_stop(handle)) && !err)
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err = err2;
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@ -1052,7 +1145,9 @@ static int ext4_add_new_descs(handle_t *handle, struct super_block *sb,
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struct ext4_super_block *es = sbi->s_es;
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struct buffer_head *gdb_bh;
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int i, gdb_off, gdb_num, err = 0;
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int meta_bg;
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meta_bg = EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG);
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for (i = 0; i < count; i++, group++) {
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int reserved_gdb = ext4_bg_has_super(sb, group) ?
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le16_to_cpu(es->s_reserved_gdt_blocks) : 0;
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@ -1072,8 +1167,11 @@ static int ext4_add_new_descs(handle_t *handle, struct super_block *sb,
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if (!err && reserved_gdb && ext4_bg_num_gdb(sb, group))
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err = reserve_backup_gdb(handle, resize_inode, group);
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} else
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} else if (meta_bg != 0) {
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err = add_new_gdb_meta_bg(sb, handle, group);
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} else {
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err = add_new_gdb(handle, resize_inode, group);
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}
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if (err)
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break;
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}
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@ -1225,7 +1323,7 @@ static void ext4_update_super(struct super_block *sb,
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}
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reserved_blocks = ext4_r_blocks_count(es) * 100;
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do_div(reserved_blocks, ext4_blocks_count(es));
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reserved_blocks = div64_u64(reserved_blocks, ext4_blocks_count(es));
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reserved_blocks *= blocks_count;
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do_div(reserved_blocks, 100);
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@ -1236,6 +1334,7 @@ static void ext4_update_super(struct super_block *sb,
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le32_add_cpu(&es->s_free_inodes_count, EXT4_INODES_PER_GROUP(sb) *
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flex_gd->count);
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ext4_debug("free blocks count %llu", ext4_free_blocks_count(es));
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/*
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* We need to protect s_groups_count against other CPUs seeing
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* inconsistent state in the superblock.
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@ -1270,6 +1369,8 @@ static void ext4_update_super(struct super_block *sb,
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percpu_counter_add(&sbi->s_freeinodes_counter,
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EXT4_INODES_PER_GROUP(sb) * flex_gd->count);
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ext4_debug("free blocks count %llu",
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percpu_counter_read(&sbi->s_freeclusters_counter));
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if (EXT4_HAS_INCOMPAT_FEATURE(sb,
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EXT4_FEATURE_INCOMPAT_FLEX_BG) &&
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sbi->s_log_groups_per_flex) {
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@ -1361,15 +1462,17 @@ exit_journal:
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int gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
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int gdb_num_end = ((group + flex_gd->count - 1) /
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EXT4_DESC_PER_BLOCK(sb));
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int meta_bg = EXT4_HAS_INCOMPAT_FEATURE(sb,
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EXT4_FEATURE_INCOMPAT_META_BG);
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update_backups(sb, sbi->s_sbh->b_blocknr, (char *)es,
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sizeof(struct ext4_super_block));
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sizeof(struct ext4_super_block), 0);
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for (; gdb_num <= gdb_num_end; gdb_num++) {
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struct buffer_head *gdb_bh;
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gdb_bh = sbi->s_group_desc[gdb_num];
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update_backups(sb, gdb_bh->b_blocknr, gdb_bh->b_data,
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gdb_bh->b_size);
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gdb_bh->b_size, meta_bg);
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}
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}
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exit:
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@ -1413,9 +1516,7 @@ static int ext4_setup_next_flex_gd(struct super_block *sb,
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group_data[i].group = group + i;
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group_data[i].blocks_count = blocks_per_group;
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overhead = ext4_bg_has_super(sb, group + i) ?
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(1 + ext4_bg_num_gdb(sb, group + i) +
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le16_to_cpu(es->s_reserved_gdt_blocks)) : 0;
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overhead = ext4_group_overhead_blocks(sb, group + i);
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group_data[i].free_blocks_count = blocks_per_group - overhead;
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if (ext4_has_group_desc_csum(sb))
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flex_gd->bg_flags[i] = EXT4_BG_BLOCK_UNINIT |
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@ -1563,11 +1664,13 @@ errout:
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err = err2;
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if (!err) {
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ext4_fsblk_t first_block;
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first_block = ext4_group_first_block_no(sb, 0);
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if (test_opt(sb, DEBUG))
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printk(KERN_DEBUG "EXT4-fs: extended group to %llu "
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"blocks\n", ext4_blocks_count(es));
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update_backups(sb, EXT4_SB(sb)->s_sbh->b_blocknr, (char *)es,
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sizeof(struct ext4_super_block));
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update_backups(sb, EXT4_SB(sb)->s_sbh->b_blocknr - first_block,
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(char *)es, sizeof(struct ext4_super_block), 0);
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}
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return err;
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}
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@ -1662,15 +1765,16 @@ int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count)
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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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struct buffer_head *bh;
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struct inode *resize_inode;
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ext4_fsblk_t o_blocks_count;
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ext4_group_t o_group;
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ext4_group_t n_group;
|
||||
ext4_grpblk_t offset, add;
|
||||
struct inode *resize_inode = NULL;
|
||||
ext4_grpblk_t add, offset;
|
||||
unsigned long n_desc_blocks;
|
||||
unsigned long o_desc_blocks;
|
||||
unsigned long desc_blocks;
|
||||
ext4_group_t o_group;
|
||||
ext4_group_t n_group;
|
||||
ext4_fsblk_t o_blocks_count;
|
||||
int err = 0, flexbg_size = 1 << sbi->s_log_groups_per_flex;
|
||||
int meta_bg;
|
||||
|
||||
o_blocks_count = ext4_blocks_count(es);
|
||||
|
||||
@ -1692,22 +1796,33 @@ int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count)
|
||||
ext4_get_group_no_and_offset(sb, o_blocks_count - 1, &o_group, &offset);
|
||||
|
||||
n_desc_blocks = (n_group + EXT4_DESC_PER_BLOCK(sb)) /
|
||||
EXT4_DESC_PER_BLOCK(sb);
|
||||
EXT4_DESC_PER_BLOCK(sb);
|
||||
o_desc_blocks = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
|
||||
EXT4_DESC_PER_BLOCK(sb);
|
||||
EXT4_DESC_PER_BLOCK(sb);
|
||||
desc_blocks = n_desc_blocks - o_desc_blocks;
|
||||
|
||||
if (desc_blocks &&
|
||||
(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_RESIZE_INODE) ||
|
||||
le16_to_cpu(es->s_reserved_gdt_blocks) < desc_blocks)) {
|
||||
ext4_warning(sb, "No reserved GDT blocks, can't resize");
|
||||
return -EPERM;
|
||||
}
|
||||
meta_bg = EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG);
|
||||
|
||||
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 (EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_RESIZE_INODE)) {
|
||||
if (meta_bg) {
|
||||
ext4_error(sb, "resize_inode and meta_bg enabled "
|
||||
"simultaneously");
|
||||
return -EINVAL;
|
||||
}
|
||||
if (le16_to_cpu(es->s_reserved_gdt_blocks) < desc_blocks) {
|
||||
ext4_warning(sb,
|
||||
"No reserved GDT blocks, can't resize");
|
||||
return -EPERM;
|
||||
}
|
||||
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);
|
||||
}
|
||||
} else if (!meta_bg) {
|
||||
ext4_warning(sb, "File system features do not permit "
|
||||
"online resize");
|
||||
return -EPERM;
|
||||
}
|
||||
|
||||
/* See if the device is actually as big as what was requested */
|
||||
@ -1761,8 +1876,8 @@ int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count)
|
||||
out:
|
||||
if (flex_gd)
|
||||
free_flex_gd(flex_gd);
|
||||
|
||||
iput(resize_inode);
|
||||
if (resize_inode != NULL)
|
||||
iput(resize_inode);
|
||||
if (test_opt(sb, DEBUG))
|
||||
ext4_msg(sb, KERN_DEBUG, "resized filesystem from %llu "
|
||||
"upto %llu blocks", o_blocks_count, n_blocks_count);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user