1 // SPDX-License-Identifier: GPL-2.0+
5  * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
21  * nilfs_palloc_groups_per_desc_block - get the number of groups that a group
22  *					descriptor block can maintain
33  * nilfs_palloc_groups_count - get maximum number of groups
39 	return 1UL << (BITS_PER_LONG - (inode->i_blkbits + 3 /* log2(8) */));  in nilfs_palloc_groups_count()
43  * nilfs_palloc_init_blockgroup - initialize private variables for allocator
51 	mi->mi_bgl = kmalloc(sizeof(*mi->mi_bgl), GFP_NOFS);  in nilfs_palloc_init_blockgroup()
52 	if (!mi->mi_bgl)  in nilfs_palloc_init_blockgroup()
53 		return -ENOMEM;  in nilfs_palloc_init_blockgroup()
55 	bgl_lock_init(mi->mi_bgl);  in nilfs_palloc_init_blockgroup()
59 	mi->mi_blocks_per_group =  in nilfs_palloc_init_blockgroup()
61 			     mi->mi_entries_per_block) + 1;  in nilfs_palloc_init_blockgroup()
64 		 * and a bitmap block  in nilfs_palloc_init_blockgroup()
66 	mi->mi_blocks_per_desc_block =  in nilfs_palloc_init_blockgroup()
68 		mi->mi_blocks_per_group + 1;  in nilfs_palloc_init_blockgroup()
71 		 * descriptor block  in nilfs_palloc_init_blockgroup()
77  * nilfs_palloc_group - get group number and offset from an entry number
92  * nilfs_palloc_desc_blkoff - get block offset of a group descriptor block
96  * nilfs_palloc_desc_blkoff() returns block offset of the descriptor
97  * block which contains a descriptor of the specified group.
104 	return desc_block * NILFS_MDT(inode)->mi_blocks_per_desc_block;  in nilfs_palloc_desc_blkoff()
108  * nilfs_palloc_bitmap_blkoff - get block offset of a bitmap block
112  * nilfs_palloc_bitmap_blkoff() returns block offset of the bitmap
113  * block used to allocate/deallocate entries in the specified group.
121 		desc_offset * NILFS_MDT(inode)->mi_blocks_per_group;  in nilfs_palloc_bitmap_blkoff()
125  * nilfs_palloc_group_desc_nfrees - get the number of free entries in a group
136 	nfree = le32_to_cpu(desc->pg_nfrees);  in nilfs_palloc_group_desc_nfrees()
142  * nilfs_palloc_group_desc_add_entries - adjust count of free entries
154 	le32_add_cpu(&desc->pg_nfrees, n);  in nilfs_palloc_group_desc_add_entries()
155 	nfree = le32_to_cpu(desc->pg_nfrees);  in nilfs_palloc_group_desc_add_entries()
161  * nilfs_palloc_entry_blkoff - get block offset of an entry block
173 		group_offset / NILFS_MDT(inode)->mi_entries_per_block;  in nilfs_palloc_entry_blkoff()
177  * nilfs_palloc_desc_block_init - initialize buffer of a group descriptor block
190 	while (n-- > 0) {  in nilfs_palloc_desc_block_init()
191 		desc->pg_nfrees = nfrees;  in nilfs_palloc_desc_block_init()
208 	if (prev->bh && blkoff == prev->blkoff &&  in nilfs_palloc_get_block()
209 	    likely(buffer_uptodate(prev->bh))) {  in nilfs_palloc_get_block()
210 		get_bh(prev->bh);  in nilfs_palloc_get_block()
211 		*bhp = prev->bh;  in nilfs_palloc_get_block()
222 		 * cache contents during the get block call.  in nilfs_palloc_get_block()
224 		brelse(prev->bh);  in nilfs_palloc_get_block()
226 		prev->bh = *bhp;  in nilfs_palloc_get_block()
227 		prev->blkoff = blkoff;  in nilfs_palloc_get_block()
234  * nilfs_palloc_delete_block - delete a block on the persistent allocator file
236  * @blkoff: block offset
245 	if (prev->bh && blkoff == prev->blkoff) {  in nilfs_palloc_delete_block()
246 		brelse(prev->bh);  in nilfs_palloc_delete_block()
247 		prev->bh = NULL;  in nilfs_palloc_delete_block()
254  * nilfs_palloc_get_desc_block - get buffer head of a group descriptor block
264 	struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;  in nilfs_palloc_get_desc_block()  local
269 				      bhp, &cache->prev_desc, &cache->lock);  in nilfs_palloc_get_desc_block()
273  * nilfs_palloc_get_bitmap_block - get buffer head of a bitmap block
283 	struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;  in nilfs_palloc_get_bitmap_block()  local
288 				      &cache->prev_bitmap, &cache->lock);  in nilfs_palloc_get_bitmap_block()
292  * nilfs_palloc_delete_bitmap_block - delete a bitmap block
299 	struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;  in nilfs_palloc_delete_bitmap_block()  local
304 					 &cache->prev_bitmap, &cache->lock);  in nilfs_palloc_delete_bitmap_block()
308  * nilfs_palloc_get_entry_block - get buffer head of an entry block
317 	struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;  in nilfs_palloc_get_entry_block()  local
322 				      &cache->prev_entry, &cache->lock);  in nilfs_palloc_get_entry_block()
326  * nilfs_palloc_delete_entry_block - delete an entry block
332 	struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;  in nilfs_palloc_delete_entry_block()  local
336 					 &cache->prev_entry, &cache->lock);  in nilfs_palloc_delete_entry_block()
340  * nilfs_palloc_block_get_group_desc - get kernel address of a group descriptor
343  * @bh: buffer head of the buffer storing the group descriptor block
356  * nilfs_palloc_block_get_entry - get kernel address of an entry
359  * @bh: buffer head of the buffer storing the entry block
368 	entry_offset = group_offset % NILFS_MDT(inode)->mi_entries_per_block;  in nilfs_palloc_block_get_entry()
371 		entry_offset * NILFS_MDT(inode)->mi_entry_size;  in nilfs_palloc_block_get_entry()
375  * nilfs_palloc_find_available_slot - find available slot in a group
410 	return -ENOSPC;  in nilfs_palloc_find_available_slot()
414  * nilfs_palloc_rest_groups_in_desc_block - get the remaining number of groups
415  *					    in a group descriptor block
425 		     nilfs_palloc_groups_per_desc_block(inode) -  in nilfs_palloc_rest_groups_in_desc_block()
427 		     max - curr + 1);  in nilfs_palloc_rest_groups_in_desc_block()
431  * nilfs_palloc_count_desc_blocks - count descriptor blocks number
441 	ret = nilfs_bmap_last_key(NILFS_I(inode)->i_bmap, &blknum);  in nilfs_palloc_count_desc_blocks()
445 			NILFS_MDT(inode)->mi_blocks_per_desc_block);  in nilfs_palloc_count_desc_blocks()
450  * nilfs_palloc_mdt_file_can_grow - check potential opportunity for
463  * nilfs_palloc_count_max_entries - count max number of entries that can be
488 		return -ERANGE;  in nilfs_palloc_count_max_entries()
495  * nilfs_palloc_prepare_alloc_entry - prepare to allocate a persistent object
514 	maxgroup = ngroups - 1;  in nilfs_palloc_prepare_alloc_entry()
515 	group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset);  in nilfs_palloc_prepare_alloc_entry()
522 			maxgroup = nilfs_palloc_group(inode, req->pr_entry_nr,  in nilfs_palloc_prepare_alloc_entry()
523 						      &maxgroup_offset) - 1;  in nilfs_palloc_prepare_alloc_entry()
528 		desc_kaddr = kmap(desc_bh->b_page);  in nilfs_palloc_prepare_alloc_entry()
540 				bitmap_kaddr = kmap(bitmap_bh->b_page);  in nilfs_palloc_prepare_alloc_entry()
548 						desc, lock, -1);  in nilfs_palloc_prepare_alloc_entry()
549 					req->pr_entry_nr =  in nilfs_palloc_prepare_alloc_entry()
551 					kunmap(desc_bh->b_page);  in nilfs_palloc_prepare_alloc_entry()
552 					kunmap(bitmap_bh->b_page);  in nilfs_palloc_prepare_alloc_entry()
554 					req->pr_desc_bh = desc_bh;  in nilfs_palloc_prepare_alloc_entry()
555 					req->pr_bitmap_bh = bitmap_bh;  in nilfs_palloc_prepare_alloc_entry()
558 				kunmap(bitmap_bh->b_page);  in nilfs_palloc_prepare_alloc_entry()
565 		kunmap(desc_bh->b_page);  in nilfs_palloc_prepare_alloc_entry()
570 	return -ENOSPC;  in nilfs_palloc_prepare_alloc_entry()
573 	kunmap(desc_bh->b_page);  in nilfs_palloc_prepare_alloc_entry()
579  * nilfs_palloc_commit_alloc_entry - finish allocation of a persistent object
586 	mark_buffer_dirty(req->pr_bitmap_bh);  in nilfs_palloc_commit_alloc_entry()
587 	mark_buffer_dirty(req->pr_desc_bh);  in nilfs_palloc_commit_alloc_entry()
590 	brelse(req->pr_bitmap_bh);  in nilfs_palloc_commit_alloc_entry()
591 	brelse(req->pr_desc_bh);  in nilfs_palloc_commit_alloc_entry()
595  * nilfs_palloc_commit_free_entry - finish deallocating a persistent object
608 	group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset);  in nilfs_palloc_commit_free_entry()
609 	desc_kaddr = kmap(req->pr_desc_bh->b_page);  in nilfs_palloc_commit_free_entry()
611 						 req->pr_desc_bh, desc_kaddr);  in nilfs_palloc_commit_free_entry()
612 	bitmap_kaddr = kmap(req->pr_bitmap_bh->b_page);  in nilfs_palloc_commit_free_entry()
613 	bitmap = bitmap_kaddr + bh_offset(req->pr_bitmap_bh);  in nilfs_palloc_commit_free_entry()
617 		nilfs_warn(inode->i_sb,  in nilfs_palloc_commit_free_entry()
619 			   __func__, inode->i_ino,  in nilfs_palloc_commit_free_entry()
620 			   (unsigned long long)req->pr_entry_nr);  in nilfs_palloc_commit_free_entry()
624 	kunmap(req->pr_bitmap_bh->b_page);  in nilfs_palloc_commit_free_entry()
625 	kunmap(req->pr_desc_bh->b_page);  in nilfs_palloc_commit_free_entry()
627 	mark_buffer_dirty(req->pr_desc_bh);  in nilfs_palloc_commit_free_entry()
628 	mark_buffer_dirty(req->pr_bitmap_bh);  in nilfs_palloc_commit_free_entry()
631 	brelse(req->pr_bitmap_bh);  in nilfs_palloc_commit_free_entry()
632 	brelse(req->pr_desc_bh);  in nilfs_palloc_commit_free_entry()
636  * nilfs_palloc_abort_alloc_entry - cancel allocation of a persistent object
649 	group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset);  in nilfs_palloc_abort_alloc_entry()
650 	desc_kaddr = kmap(req->pr_desc_bh->b_page);  in nilfs_palloc_abort_alloc_entry()
652 						 req->pr_desc_bh, desc_kaddr);  in nilfs_palloc_abort_alloc_entry()
653 	bitmap_kaddr = kmap(req->pr_bitmap_bh->b_page);  in nilfs_palloc_abort_alloc_entry()
654 	bitmap = bitmap_kaddr + bh_offset(req->pr_bitmap_bh);  in nilfs_palloc_abort_alloc_entry()
658 		nilfs_warn(inode->i_sb,  in nilfs_palloc_abort_alloc_entry()
660 			   __func__, inode->i_ino,  in nilfs_palloc_abort_alloc_entry()
661 			   (unsigned long long)req->pr_entry_nr);  in nilfs_palloc_abort_alloc_entry()
665 	kunmap(req->pr_bitmap_bh->b_page);  in nilfs_palloc_abort_alloc_entry()
666 	kunmap(req->pr_desc_bh->b_page);  in nilfs_palloc_abort_alloc_entry()
668 	brelse(req->pr_bitmap_bh);  in nilfs_palloc_abort_alloc_entry()
669 	brelse(req->pr_desc_bh);  in nilfs_palloc_abort_alloc_entry()
671 	req->pr_entry_nr = 0;  in nilfs_palloc_abort_alloc_entry()
672 	req->pr_bitmap_bh = NULL;  in nilfs_palloc_abort_alloc_entry()
673 	req->pr_desc_bh = NULL;  in nilfs_palloc_abort_alloc_entry()
677  * nilfs_palloc_prepare_free_entry - prepare to deallocate a persistent object
688 	group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset);  in nilfs_palloc_prepare_free_entry()
698 	req->pr_desc_bh = desc_bh;  in nilfs_palloc_prepare_free_entry()
699 	req->pr_bitmap_bh = bitmap_bh;  in nilfs_palloc_prepare_free_entry()
704  * nilfs_palloc_abort_free_entry - cancel deallocating a persistent object
711 	brelse(req->pr_bitmap_bh);  in nilfs_palloc_abort_free_entry()
712 	brelse(req->pr_desc_bh);  in nilfs_palloc_abort_free_entry()
714 	req->pr_entry_nr = 0;  in nilfs_palloc_abort_free_entry()
715 	req->pr_bitmap_bh = NULL;  in nilfs_palloc_abort_free_entry()
716 	req->pr_desc_bh = NULL;  in nilfs_palloc_abort_free_entry()
720  * nilfs_palloc_freev - deallocate a set of persistent objects
734 	const unsigned int epb = NILFS_MDT(inode)->mi_entries_per_block;  in nilfs_palloc_freev()
758 		bitmap_kaddr = kmap(bitmap_bh->b_page);  in nilfs_palloc_freev()
767 				nilfs_warn(inode->i_sb,  in nilfs_palloc_freev()
769 					   __func__, inode->i_ino,  in nilfs_palloc_freev()
780 				group_offset = entry_nrs[j] - group_min_nr;  in nilfs_palloc_freev()
783 					/* This entry is in the same block */  in nilfs_palloc_freev()
788 			/* Test if the entry block is empty or not */  in nilfs_palloc_freev()
792 				last_nrs[nempties++] = entry_nrs[j - 1];  in nilfs_palloc_freev()
800 			/* Go on to the next entry block */  in nilfs_palloc_freev()
804 		kunmap(bitmap_bh->b_page);  in nilfs_palloc_freev()
811 			if (ret && ret != -ENOENT)  in nilfs_palloc_freev()
812 				nilfs_warn(inode->i_sb,  in nilfs_palloc_freev()
813 					   "error %d deleting block that object (entry=%llu, ino=%lu) belongs to",  in nilfs_palloc_freev()
815 					   inode->i_ino);  in nilfs_palloc_freev()
818 		desc_kaddr = kmap_atomic(desc_bh->b_page);  in nilfs_palloc_freev()
829 			if (ret && ret != -ENOENT)  in nilfs_palloc_freev()
830 				nilfs_warn(inode->i_sb,  in nilfs_palloc_freev()
831 					   "error %d deleting bitmap block of group=%lu, ino=%lu",  in nilfs_palloc_freev()
832 					   ret, group, inode->i_ino);  in nilfs_palloc_freev()
839 			      struct nilfs_palloc_cache *cache)  in nilfs_palloc_setup_cache()  argument
841 	NILFS_MDT(inode)->mi_palloc_cache = cache;  in nilfs_palloc_setup_cache()
842 	spin_lock_init(&cache->lock);  in nilfs_palloc_setup_cache()
847 	struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;  in nilfs_palloc_clear_cache()  local
849 	spin_lock(&cache->lock);  in nilfs_palloc_clear_cache()
850 	brelse(cache->prev_desc.bh);  in nilfs_palloc_clear_cache()
851 	brelse(cache->prev_bitmap.bh);  in nilfs_palloc_clear_cache()
852 	brelse(cache->prev_entry.bh);  in nilfs_palloc_clear_cache()
853 	cache->prev_desc.bh = NULL;  in nilfs_palloc_clear_cache()
854 	cache->prev_bitmap.bh = NULL;  in nilfs_palloc_clear_cache()
855 	cache->prev_entry.bh = NULL;  in nilfs_palloc_clear_cache()
856 	spin_unlock(&cache->lock);  in nilfs_palloc_clear_cache()
862 	NILFS_MDT(inode)->mi_palloc_cache = NULL;  in nilfs_palloc_destroy_cache()