mirror of
https://github.com/torvalds/linux.git
synced 2024-12-29 14:21:47 +00:00
ext4: add a function which sets up group blocks of a flex bg
This patch adds a function named setup_new_flex_group_blocks() which sets up group blocks of a flex bg. 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
28c7bac009
commit
33afdcc540
@ -511,6 +511,14 @@ struct ext4_new_group_data {
|
||||
__u32 free_blocks_count;
|
||||
};
|
||||
|
||||
/* Indexes used to index group tables in ext4_new_group_data */
|
||||
enum {
|
||||
BLOCK_BITMAP = 0, /* block bitmap */
|
||||
INODE_BITMAP, /* inode bitmap */
|
||||
INODE_TABLE, /* inode tables */
|
||||
GROUP_TABLE_COUNT,
|
||||
};
|
||||
|
||||
/*
|
||||
* Flags used by ext4_map_blocks()
|
||||
*/
|
||||
|
||||
250
fs/ext4/resize.c
250
fs/ext4/resize.c
@ -233,6 +233,256 @@ static int extend_or_restart_transaction(handle_t *handle, int thresh)
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* set_flexbg_block_bitmap() mark @count blocks starting from @block used.
|
||||
*
|
||||
* Helper function for ext4_setup_new_group_blocks() which set .
|
||||
*
|
||||
* @sb: super block
|
||||
* @handle: journal handle
|
||||
* @flex_gd: flex group data
|
||||
*/
|
||||
static int set_flexbg_block_bitmap(struct super_block *sb, handle_t *handle,
|
||||
struct ext4_new_flex_group_data *flex_gd,
|
||||
ext4_fsblk_t block, ext4_group_t count)
|
||||
{
|
||||
ext4_group_t count2;
|
||||
|
||||
ext4_debug("mark blocks [%llu/%u] used\n", block, count);
|
||||
for (count2 = count; count > 0; count -= count2, block += count2) {
|
||||
ext4_fsblk_t start;
|
||||
struct buffer_head *bh;
|
||||
ext4_group_t group;
|
||||
int err;
|
||||
|
||||
ext4_get_group_no_and_offset(sb, block, &group, NULL);
|
||||
start = ext4_group_first_block_no(sb, group);
|
||||
group -= flex_gd->groups[0].group;
|
||||
|
||||
count2 = sb->s_blocksize * 8 - (block - start);
|
||||
if (count2 > count)
|
||||
count2 = count;
|
||||
|
||||
if (flex_gd->bg_flags[group] & EXT4_BG_BLOCK_UNINIT) {
|
||||
BUG_ON(flex_gd->count > 1);
|
||||
continue;
|
||||
}
|
||||
|
||||
err = extend_or_restart_transaction(handle, 1);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
bh = sb_getblk(sb, flex_gd->groups[group].block_bitmap);
|
||||
if (!bh)
|
||||
return -EIO;
|
||||
|
||||
err = ext4_journal_get_write_access(handle, bh);
|
||||
if (err)
|
||||
return err;
|
||||
ext4_debug("mark block bitmap %#04llx (+%llu/%u)\n", block,
|
||||
block - start, count2);
|
||||
ext4_set_bits(bh->b_data, block - 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;
|
||||
|
||||
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);
|
||||
|
||||
/* This transaction may be extended/restarted along the way */
|
||||
handle = ext4_journal_start_sb(sb, 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;
|
||||
|
||||
gdblocks = ext4_bg_num_gdb(sb, group);
|
||||
start = ext4_group_first_block_no(sb, group);
|
||||
|
||||
/* Copy all of the GDT blocks into the backup in this group */
|
||||
for (j = 0, block = start + 1; 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 (!gdb) {
|
||||
err = -EIO;
|
||||
goto out;
|
||||
}
|
||||
|
||||
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;
|
||||
}
|
||||
|
||||
/* 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);
|
||||
goto out;
|
||||
}
|
||||
if (ext4_bg_has_super(sb, group)) {
|
||||
ext4_debug("mark backup superblock %#04llx (+0)\n",
|
||||
start);
|
||||
ext4_set_bits(bh->b_data, 0, gdblocks + reserved_gdb +
|
||||
1);
|
||||
}
|
||||
ext4_mark_bitmap_end(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);
|
||||
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, start, count);
|
||||
if (err)
|
||||
goto out;
|
||||
count = group_table_count[j];
|
||||
start = group_data[i].block_bitmap;
|
||||
block = start;
|
||||
}
|
||||
|
||||
if (count) {
|
||||
err = set_flexbg_block_bitmap(sb, handle,
|
||||
flex_gd, start, count);
|
||||
if (err)
|
||||
goto out;
|
||||
}
|
||||
}
|
||||
|
||||
out:
|
||||
brelse(bh);
|
||||
err2 = ext4_journal_stop(handle);
|
||||
if (err2 && !err)
|
||||
err = err2;
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
/*
|
||||
* Set up the block and inode bitmaps, and the inode table for the new group.
|
||||
* This doesn't need to be part of the main transaction, since we are only
|
||||
|
||||
Loading…
Reference in New Issue
Block a user