forked from luck/tmp_suning_uos_patched
ext4: bigalloc changes to block bitmap initialization functions
Add bigalloc support to ext4_init_block_bitmap() and ext4_free_blocks_after_init(). Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o
parent
fd034a84e1
commit
d5b8f31007
129
fs/ext4/balloc.c
129
fs/ext4/balloc.c
@ -23,9 +23,6 @@
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#include <trace/events/ext4.h>
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static unsigned int num_base_meta_blocks(struct super_block *sb,
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ext4_group_t block_group);
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/*
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* balloc.c contains the blocks allocation and deallocation routines
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*/
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@ -58,37 +55,87 @@ static int ext4_block_in_group(struct super_block *sb, ext4_fsblk_t block,
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return 0;
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}
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static int ext4_group_used_meta_blocks(struct super_block *sb,
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ext4_group_t block_group,
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struct ext4_group_desc *gdp)
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/* Return the number of clusters used for file system metadata; this
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* represents the overhead needed by the file system.
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*/
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unsigned ext4_num_overhead_clusters(struct super_block *sb,
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ext4_group_t block_group,
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struct ext4_group_desc *gdp)
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{
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ext4_fsblk_t tmp;
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unsigned num_clusters;
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int block_cluster = -1, inode_cluster = -1, itbl_cluster = -1, i, c;
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ext4_fsblk_t start = ext4_group_first_block_no(sb, block_group);
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ext4_fsblk_t itbl_blk;
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struct ext4_sb_info *sbi = EXT4_SB(sb);
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/* block bitmap, inode bitmap, and inode table blocks */
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int used_blocks = sbi->s_itb_per_group + 2;
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if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) {
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if (!ext4_block_in_group(sb, ext4_block_bitmap(sb, gdp),
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block_group))
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used_blocks--;
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/* This is the number of clusters used by the superblock,
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* block group descriptors, and reserved block group
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* descriptor blocks */
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num_clusters = ext4_num_base_meta_clusters(sb, block_group);
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if (!ext4_block_in_group(sb, ext4_inode_bitmap(sb, gdp),
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block_group))
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used_blocks--;
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tmp = ext4_inode_table(sb, gdp);
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for (; tmp < ext4_inode_table(sb, gdp) +
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sbi->s_itb_per_group; tmp++) {
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if (!ext4_block_in_group(sb, tmp, block_group))
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used_blocks -= 1;
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/*
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* For the allocation bitmaps and inode table, we first need
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* to check to see if the block is in the block group. If it
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* is, then check to see if the cluster is already accounted
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* for in the clusters used for the base metadata cluster, or
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* if we can increment the base metadata cluster to include
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* that block. Otherwise, we will have to track the cluster
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* used for the allocation bitmap or inode table explicitly.
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* Normally all of these blocks are contiguous, so the special
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* case handling shouldn't be necessary except for *very*
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* unusual file system layouts.
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*/
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if (ext4_block_in_group(sb, ext4_block_bitmap(sb, gdp), block_group)) {
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block_cluster = EXT4_B2C(sbi, (start -
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ext4_block_bitmap(sb, gdp)));
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if (block_cluster < num_clusters)
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block_cluster = -1;
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else if (block_cluster == num_clusters) {
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num_clusters++;
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block_cluster = -1;
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}
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}
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return used_blocks;
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if (ext4_block_in_group(sb, ext4_inode_bitmap(sb, gdp), block_group)) {
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inode_cluster = EXT4_B2C(sbi,
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start - ext4_inode_bitmap(sb, gdp));
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if (inode_cluster < num_clusters)
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inode_cluster = -1;
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else if (inode_cluster == num_clusters) {
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num_clusters++;
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inode_cluster = -1;
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}
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}
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itbl_blk = ext4_inode_table(sb, gdp);
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for (i = 0; i < sbi->s_itb_per_group; i++) {
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if (ext4_block_in_group(sb, itbl_blk + i, block_group)) {
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c = EXT4_B2C(sbi, start - itbl_blk + i);
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if ((c < num_clusters) || (c == inode_cluster) ||
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(c == block_cluster) || (c == itbl_cluster))
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continue;
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if (c == num_clusters) {
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num_clusters++;
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continue;
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}
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num_clusters++;
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itbl_cluster = c;
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}
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}
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if (block_cluster != -1)
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num_clusters++;
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if (inode_cluster != -1)
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num_clusters++;
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return num_clusters;
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}
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static unsigned int num_blocks_in_group(struct super_block *sb,
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ext4_group_t block_group)
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static unsigned int num_clusters_in_group(struct super_block *sb,
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ext4_group_t block_group)
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{
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unsigned int blocks;
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if (block_group == ext4_get_groups_count(sb) - 1) {
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/*
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* Even though mke2fs always initializes the first and
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@ -96,10 +143,11 @@ static unsigned int num_blocks_in_group(struct super_block *sb,
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* we need to make sure we calculate the right free
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* blocks.
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*/
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return ext4_blocks_count(EXT4_SB(sb)->s_es) -
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blocks = ext4_blocks_count(EXT4_SB(sb)->s_es) -
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ext4_group_first_block_no(sb, block_group);
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} else
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return EXT4_BLOCKS_PER_GROUP(sb);
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blocks = EXT4_BLOCKS_PER_GROUP(sb);
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return EXT4_NUM_B2C(EXT4_SB(sb), blocks);
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}
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/* Initializes an uninitialized block bitmap */
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@ -107,7 +155,7 @@ void ext4_init_block_bitmap(struct super_block *sb, struct buffer_head *bh,
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ext4_group_t block_group,
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struct ext4_group_desc *gdp)
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{
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unsigned int bit, bit_max = num_base_meta_blocks(sb, block_group);
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unsigned int bit, bit_max;
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struct ext4_sb_info *sbi = EXT4_SB(sb);
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ext4_fsblk_t start, tmp;
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int flex_bg = 0;
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@ -126,6 +174,7 @@ void ext4_init_block_bitmap(struct super_block *sb, struct buffer_head *bh,
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}
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memset(bh->b_data, 0, sb->s_blocksize);
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bit_max = ext4_num_base_meta_clusters(sb, block_group);
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for (bit = 0; bit < bit_max; bit++)
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ext4_set_bit(bit, bh->b_data);
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@ -137,24 +186,25 @@ void ext4_init_block_bitmap(struct super_block *sb, struct buffer_head *bh,
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/* Set bits for block and inode bitmaps, and inode table */
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tmp = ext4_block_bitmap(sb, gdp);
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if (!flex_bg || ext4_block_in_group(sb, tmp, block_group))
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ext4_set_bit(tmp - start, bh->b_data);
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ext4_set_bit(EXT4_B2C(sbi, tmp - start), bh->b_data);
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tmp = ext4_inode_bitmap(sb, gdp);
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if (!flex_bg || ext4_block_in_group(sb, tmp, block_group))
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ext4_set_bit(tmp - start, bh->b_data);
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ext4_set_bit(EXT4_B2C(sbi, tmp - start), bh->b_data);
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tmp = ext4_inode_table(sb, gdp);
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for (; tmp < ext4_inode_table(sb, gdp) +
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sbi->s_itb_per_group; tmp++) {
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if (!flex_bg || ext4_block_in_group(sb, tmp, block_group))
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ext4_set_bit(tmp - start, bh->b_data);
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ext4_set_bit(EXT4_B2C(sbi, tmp - start), bh->b_data);
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}
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/*
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* Also if the number of blocks within the group is less than
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* the blocksize * 8 ( which is the size of bitmap ), set rest
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* of the block bitmap to 1
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*/
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ext4_mark_bitmap_end(num_blocks_in_group(sb, block_group),
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ext4_mark_bitmap_end(num_clusters_in_group(sb, block_group),
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sb->s_blocksize * 8, bh->b_data);
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}
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@ -165,9 +215,8 @@ unsigned ext4_free_blocks_after_init(struct super_block *sb,
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ext4_group_t block_group,
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struct ext4_group_desc *gdp)
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{
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return num_blocks_in_group(sb, block_group) -
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num_base_meta_blocks(sb, block_group) -
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ext4_group_used_meta_blocks(sb, block_group, gdp);
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return num_clusters_in_group(sb, block_group) -
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ext4_num_overhead_clusters(sb, block_group, gdp);
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}
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/*
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@ -611,14 +660,14 @@ unsigned long ext4_bg_num_gdb(struct super_block *sb, ext4_group_t group)
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}
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/*
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* This function returns the number of file system metadata blocks at
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* This function returns the number of file system metadata clusters at
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* the beginning of a block group, including the reserved gdt blocks.
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*/
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static unsigned int num_base_meta_blocks(struct super_block *sb,
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ext4_group_t block_group)
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unsigned ext4_num_base_meta_clusters(struct super_block *sb,
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ext4_group_t block_group)
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{
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struct ext4_sb_info *sbi = EXT4_SB(sb);
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int num;
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unsigned num;
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/* Check for superblock and gdt backups in this group */
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num = ext4_bg_has_super(sb, block_group);
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@ -633,7 +682,7 @@ static unsigned int num_base_meta_blocks(struct super_block *sb,
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} else { /* For META_BG_BLOCK_GROUPS */
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num += ext4_bg_num_gdb(sb, block_group);
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}
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return num;
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return EXT4_NUM_B2C(sbi, num);
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}
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/**
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* ext4_inode_to_goal_block - return a hint for block allocation
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@ -261,6 +261,14 @@ struct ext4_io_submit {
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#endif
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#define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
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/* Translate a block number to a cluster number */
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#define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
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/* Translate a cluster number to a block number */
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#define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
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/* Translate # of blks to # of clusters */
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#define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
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(sbi)->s_cluster_bits)
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/*
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* Structure of a blocks group descriptor
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*/
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@ -1770,6 +1778,11 @@ extern void ext4_init_block_bitmap(struct super_block *sb,
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extern unsigned ext4_free_blocks_after_init(struct super_block *sb,
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ext4_group_t block_group,
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struct ext4_group_desc *gdp);
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extern unsigned ext4_num_base_meta_clusters(struct super_block *sb,
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ext4_group_t block_group);
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extern unsigned ext4_num_overhead_clusters(struct super_block *sb,
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ext4_group_t block_group,
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struct ext4_group_desc *gdp);
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ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
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/* dir.c */
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