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ext4: move ext4_add_groupblocks() to mballoc.c
In preparation for the next patch, the function ext4_add_groupblocks() is moved to mballoc.c, where it could use some static functions. Signed-off-by: Amir Goldstein <amir73il@users.sf.net> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Amir Goldstein
Theodore Ts'o
parent
66bb82798d
commit
2846e82004
124
fs/ext4/balloc.c
124
fs/ext4/balloc.c
@ -361,130 +361,6 @@ ext4_read_block_bitmap(struct super_block *sb, ext4_group_t block_group)
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return bh;
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}
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/**
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* ext4_add_groupblocks() -- Add given blocks to an existing group
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* @handle: handle to this transaction
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* @sb: super block
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* @block: start physcial block to add to the block group
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* @count: number of blocks to free
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*
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* This marks the blocks as free in the bitmap. We ask the
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* mballoc to reload the buddy after this by setting group
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* EXT4_GROUP_INFO_NEED_INIT_BIT flag
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*/
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void ext4_add_groupblocks(handle_t *handle, struct super_block *sb,
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ext4_fsblk_t block, unsigned long count)
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{
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struct buffer_head *bitmap_bh = NULL;
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struct buffer_head *gd_bh;
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ext4_group_t block_group;
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ext4_grpblk_t bit;
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unsigned int i;
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struct ext4_group_desc *desc;
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struct ext4_sb_info *sbi = EXT4_SB(sb);
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int err = 0, ret, blk_free_count;
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ext4_grpblk_t blocks_freed;
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struct ext4_group_info *grp;
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ext4_debug("Adding block(s) %llu-%llu\n", block, block + count - 1);
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ext4_get_group_no_and_offset(sb, block, &block_group, &bit);
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grp = ext4_get_group_info(sb, block_group);
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/*
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* Check to see if we are freeing blocks across a group
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* boundary.
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*/
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if (bit + count > EXT4_BLOCKS_PER_GROUP(sb)) {
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goto error_return;
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}
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bitmap_bh = ext4_read_block_bitmap(sb, block_group);
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if (!bitmap_bh)
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goto error_return;
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desc = ext4_get_group_desc(sb, block_group, &gd_bh);
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if (!desc)
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goto error_return;
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if (in_range(ext4_block_bitmap(sb, desc), block, count) ||
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in_range(ext4_inode_bitmap(sb, desc), block, count) ||
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in_range(block, ext4_inode_table(sb, desc), sbi->s_itb_per_group) ||
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in_range(block + count - 1, ext4_inode_table(sb, desc),
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sbi->s_itb_per_group)) {
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ext4_error(sb, "Adding blocks in system zones - "
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"Block = %llu, count = %lu",
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block, count);
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goto error_return;
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}
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/*
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* We are about to add blocks to the bitmap,
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* so we need undo access.
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*/
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BUFFER_TRACE(bitmap_bh, "getting undo access");
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err = ext4_journal_get_undo_access(handle, bitmap_bh);
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if (err)
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goto error_return;
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/*
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* We are about to modify some metadata. Call the journal APIs
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* to unshare ->b_data if a currently-committing transaction is
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* using it
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*/
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BUFFER_TRACE(gd_bh, "get_write_access");
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err = ext4_journal_get_write_access(handle, gd_bh);
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if (err)
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goto error_return;
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/*
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* make sure we don't allow a parallel init on other groups in the
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* same buddy cache
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*/
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down_write(&grp->alloc_sem);
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for (i = 0, blocks_freed = 0; i < count; i++) {
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BUFFER_TRACE(bitmap_bh, "clear bit");
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if (!ext4_clear_bit_atomic(ext4_group_lock_ptr(sb, block_group),
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bit + i, bitmap_bh->b_data)) {
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ext4_error(sb, "bit already cleared for block %llu",
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(ext4_fsblk_t)(block + i));
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BUFFER_TRACE(bitmap_bh, "bit already cleared");
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} else {
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blocks_freed++;
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}
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}
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ext4_lock_group(sb, block_group);
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blk_free_count = blocks_freed + ext4_free_blks_count(sb, desc);
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ext4_free_blks_set(sb, desc, blk_free_count);
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desc->bg_checksum = ext4_group_desc_csum(sbi, block_group, desc);
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ext4_unlock_group(sb, block_group);
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percpu_counter_add(&sbi->s_freeblocks_counter, blocks_freed);
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if (sbi->s_log_groups_per_flex) {
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ext4_group_t flex_group = ext4_flex_group(sbi, block_group);
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atomic_add(blocks_freed,
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&sbi->s_flex_groups[flex_group].free_blocks);
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}
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/*
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* request to reload the buddy with the
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* new bitmap information
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*/
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set_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &(grp->bb_state));
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grp->bb_free += blocks_freed;
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up_write(&grp->alloc_sem);
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/* We dirtied the bitmap block */
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BUFFER_TRACE(bitmap_bh, "dirtied bitmap block");
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err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh);
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/* And the group descriptor block */
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BUFFER_TRACE(gd_bh, "dirtied group descriptor block");
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ret = ext4_handle_dirty_metadata(handle, NULL, gd_bh);
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if (!err)
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err = ret;
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error_return:
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brelse(bitmap_bh);
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ext4_std_error(sb, err);
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return;
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}
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/**
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* ext4_has_free_blocks()
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* @sbi: in-core super block structure.
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@ -1655,8 +1655,6 @@ extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
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extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
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ext4_fsblk_t goal, unsigned long *count, int *errp);
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extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
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extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb,
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ext4_fsblk_t block, unsigned long count);
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extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *);
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extern void ext4_check_blocks_bitmap(struct super_block *);
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extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
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@ -1721,6 +1719,8 @@ extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
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unsigned long count, int flags);
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extern int ext4_mb_add_groupinfo(struct super_block *sb,
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ext4_group_t i, struct ext4_group_desc *desc);
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extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb,
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ext4_fsblk_t block, unsigned long count);
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extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
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/* inode.c */
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@ -4699,6 +4699,130 @@ void ext4_free_blocks(handle_t *handle, struct inode *inode,
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return;
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}
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/**
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* ext4_add_groupblocks() -- Add given blocks to an existing group
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* @handle: handle to this transaction
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* @sb: super block
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* @block: start physcial block to add to the block group
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* @count: number of blocks to free
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*
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* This marks the blocks as free in the bitmap. We ask the
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* mballoc to reload the buddy after this by setting group
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* EXT4_GROUP_INFO_NEED_INIT_BIT flag
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*/
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void ext4_add_groupblocks(handle_t *handle, struct super_block *sb,
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ext4_fsblk_t block, unsigned long count)
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{
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struct buffer_head *bitmap_bh = NULL;
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struct buffer_head *gd_bh;
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ext4_group_t block_group;
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ext4_grpblk_t bit;
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unsigned int i;
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struct ext4_group_desc *desc;
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struct ext4_sb_info *sbi = EXT4_SB(sb);
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int err = 0, ret, blk_free_count;
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ext4_grpblk_t blocks_freed;
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struct ext4_group_info *grp;
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ext4_debug("Adding block(s) %llu-%llu\n", block, block + count - 1);
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ext4_get_group_no_and_offset(sb, block, &block_group, &bit);
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grp = ext4_get_group_info(sb, block_group);
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/*
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* Check to see if we are freeing blocks across a group
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* boundary.
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*/
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if (bit + count > EXT4_BLOCKS_PER_GROUP(sb)) {
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goto error_return;
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}
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bitmap_bh = ext4_read_block_bitmap(sb, block_group);
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if (!bitmap_bh)
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goto error_return;
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desc = ext4_get_group_desc(sb, block_group, &gd_bh);
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if (!desc)
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goto error_return;
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if (in_range(ext4_block_bitmap(sb, desc), block, count) ||
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in_range(ext4_inode_bitmap(sb, desc), block, count) ||
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in_range(block, ext4_inode_table(sb, desc), sbi->s_itb_per_group) ||
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in_range(block + count - 1, ext4_inode_table(sb, desc),
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sbi->s_itb_per_group)) {
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ext4_error(sb, "Adding blocks in system zones - "
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"Block = %llu, count = %lu",
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block, count);
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goto error_return;
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}
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/*
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* We are about to add blocks to the bitmap,
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* so we need undo access.
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*/
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BUFFER_TRACE(bitmap_bh, "getting undo access");
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err = ext4_journal_get_undo_access(handle, bitmap_bh);
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if (err)
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goto error_return;
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/*
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* We are about to modify some metadata. Call the journal APIs
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* to unshare ->b_data if a currently-committing transaction is
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* using it
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*/
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BUFFER_TRACE(gd_bh, "get_write_access");
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err = ext4_journal_get_write_access(handle, gd_bh);
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if (err)
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goto error_return;
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/*
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* make sure we don't allow a parallel init on other groups in the
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* same buddy cache
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*/
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down_write(&grp->alloc_sem);
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for (i = 0, blocks_freed = 0; i < count; i++) {
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BUFFER_TRACE(bitmap_bh, "clear bit");
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if (!ext4_clear_bit_atomic(ext4_group_lock_ptr(sb, block_group),
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bit + i, bitmap_bh->b_data)) {
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ext4_error(sb, "bit already cleared for block %llu",
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(ext4_fsblk_t)(block + i));
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BUFFER_TRACE(bitmap_bh, "bit already cleared");
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} else {
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blocks_freed++;
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}
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}
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ext4_lock_group(sb, block_group);
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blk_free_count = blocks_freed + ext4_free_blks_count(sb, desc);
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ext4_free_blks_set(sb, desc, blk_free_count);
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desc->bg_checksum = ext4_group_desc_csum(sbi, block_group, desc);
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ext4_unlock_group(sb, block_group);
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percpu_counter_add(&sbi->s_freeblocks_counter, blocks_freed);
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if (sbi->s_log_groups_per_flex) {
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ext4_group_t flex_group = ext4_flex_group(sbi, block_group);
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atomic_add(blocks_freed,
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&sbi->s_flex_groups[flex_group].free_blocks);
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}
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/*
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* request to reload the buddy with the
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* new bitmap information
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*/
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set_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &(grp->bb_state));
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grp->bb_free += blocks_freed;
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up_write(&grp->alloc_sem);
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/* We dirtied the bitmap block */
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BUFFER_TRACE(bitmap_bh, "dirtied bitmap block");
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err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh);
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/* And the group descriptor block */
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BUFFER_TRACE(gd_bh, "dirtied group descriptor block");
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ret = ext4_handle_dirty_metadata(handle, NULL, gd_bh);
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if (!err)
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err = ret;
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error_return:
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brelse(bitmap_bh);
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ext4_std_error(sb, err);
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return;
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}
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/**
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* ext4_trim_extent -- function to TRIM one single free extent in the group
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* @sb: super block for the file system
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