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
25  * Return: Number of groups that a group descriptor block can maintain.
35  * nilfs_palloc_groups_count - get maximum number of groups
43 	return 1UL << (BITS_PER_LONG - (inode->i_blkbits + 3 /* log2(8) */));  in nilfs_palloc_groups_count()
47  * nilfs_palloc_init_blockgroup - initialize private variables for allocator
57 	mi->mi_bgl = kmalloc(sizeof(*mi->mi_bgl), GFP_NOFS);  in nilfs_palloc_init_blockgroup()
58 	if (!mi->mi_bgl)  in nilfs_palloc_init_blockgroup()
59 		return -ENOMEM;  in nilfs_palloc_init_blockgroup()
61 	bgl_lock_init(mi->mi_bgl);  in nilfs_palloc_init_blockgroup()
65 	mi->mi_blocks_per_group =  in nilfs_palloc_init_blockgroup()
67 			     mi->mi_entries_per_block) + 1;  in nilfs_palloc_init_blockgroup()
70 		 * and a bitmap block  in nilfs_palloc_init_blockgroup()
72 	mi->mi_blocks_per_desc_block =  in nilfs_palloc_init_blockgroup()
74 		mi->mi_blocks_per_group + 1;  in nilfs_palloc_init_blockgroup()
77 		 * descriptor block  in nilfs_palloc_init_blockgroup()
83  * nilfs_palloc_group - get group number and offset from an entry number
101  * nilfs_palloc_desc_blkoff - get block offset of a group descriptor block
105  * Return: Index number in the metadata file of the descriptor block of
113 	return desc_block * NILFS_MDT(inode)->mi_blocks_per_desc_block;  in nilfs_palloc_desc_blkoff()
117  * nilfs_palloc_bitmap_blkoff - get block offset of a bitmap block
121  * nilfs_palloc_bitmap_blkoff() returns block offset of the bitmap
122  * block used to allocate/deallocate entries in the specified group.
124  * Return: Index number in the metadata file of the bitmap block of
133 		desc_offset * NILFS_MDT(inode)->mi_blocks_per_group;  in nilfs_palloc_bitmap_blkoff()
137  * nilfs_palloc_group_desc_nfrees - get the number of free entries in a group
150 	nfree = le32_to_cpu(desc->pg_nfrees);  in nilfs_palloc_group_desc_nfrees()
156  * nilfs_palloc_group_desc_add_entries - adjust count of free entries
171 	le32_add_cpu(&desc->pg_nfrees, n);  in nilfs_palloc_group_desc_add_entries()
172 	nfree = le32_to_cpu(desc->pg_nfrees);  in nilfs_palloc_group_desc_add_entries()
178  * nilfs_palloc_entry_blkoff - get block offset of an entry block
182  * Return: Index number in the metadata file of the block containing
193 		group_offset / NILFS_MDT(inode)->mi_entries_per_block;  in nilfs_palloc_entry_blkoff()
197  * nilfs_palloc_desc_block_init - initialize buffer of a group descriptor block
200  * @from: kernel address mapped for a chunk of the block
202  * This function does not yet support the case where block size > PAGE_SIZE.
212 	while (n-- > 0) {  in nilfs_palloc_desc_block_init()
213 		desc->pg_nfrees = nfrees;  in nilfs_palloc_desc_block_init()
230 	if (prev->bh && blkoff == prev->blkoff &&  in nilfs_palloc_get_block()
231 	    likely(buffer_uptodate(prev->bh))) {  in nilfs_palloc_get_block()
232 		get_bh(prev->bh);  in nilfs_palloc_get_block()
233 		*bhp = prev->bh;  in nilfs_palloc_get_block()
244 		 * cache contents during the get block call.  in nilfs_palloc_get_block()
246 		brelse(prev->bh);  in nilfs_palloc_get_block()
248 		prev->bh = *bhp;  in nilfs_palloc_get_block()
249 		prev->blkoff = blkoff;  in nilfs_palloc_get_block()
256  * nilfs_palloc_delete_block - delete a block on the persistent allocator file
258  * @blkoff: block offset
264  * * %-EIO	- I/O error (including metadata corruption).
265  * * %-ENOENT	- Non-existent block.
266  * * %-ENOMEM	- Insufficient memory available.
273 	if (prev->bh && blkoff == prev->blkoff) {  in nilfs_palloc_delete_block()
274 		brelse(prev->bh);  in nilfs_palloc_delete_block()
275 		prev->bh = NULL;  in nilfs_palloc_delete_block()
282  * nilfs_palloc_get_desc_block - get buffer head of a group descriptor block
294 	struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;  in nilfs_palloc_get_desc_block()  local
299 				      bhp, &cache->prev_desc, &cache->lock);  in nilfs_palloc_get_desc_block()
303  * nilfs_palloc_get_bitmap_block - get buffer head of a bitmap block
315 	struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;  in nilfs_palloc_get_bitmap_block()  local
320 				      &cache->prev_bitmap, &cache->lock);  in nilfs_palloc_get_bitmap_block()
324  * nilfs_palloc_delete_bitmap_block - delete a bitmap block
333 	struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;  in nilfs_palloc_delete_bitmap_block()  local
338 					 &cache->prev_bitmap, &cache->lock);  in nilfs_palloc_delete_bitmap_block()
342  * nilfs_palloc_get_entry_block - get buffer head of an entry block
353 	struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;  in nilfs_palloc_get_entry_block()  local
358 				      &cache->prev_entry, &cache->lock);  in nilfs_palloc_get_entry_block()
362  * nilfs_palloc_delete_entry_block - delete an entry block
370 	struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;  in nilfs_palloc_delete_entry_block()  local
374 					 &cache->prev_entry, &cache->lock);  in nilfs_palloc_delete_entry_block()
378  * nilfs_palloc_group_desc_offset - calculate the byte offset of a group
382  * @bh:    buffer head of the group descriptor block
390 	return offset_in_folio(bh->b_folio, bh->b_data) +  in nilfs_palloc_group_desc_offset()
396  * nilfs_palloc_bitmap_offset - calculate the byte offset of a bitmap block
398  * @bh: buffer head of the bitmap block
400  * Return: Byte offset in the folio of the bitmap block for @bh.
404 	return offset_in_folio(bh->b_folio, bh->b_data);  in nilfs_palloc_bitmap_offset()
408  * nilfs_palloc_entry_offset - calculate the byte offset of an entry in the
412  * @bh:    buffer head of the entry block
423 		NILFS_MDT(inode)->mi_entries_per_block;  in nilfs_palloc_entry_offset()
425 	return offset_in_folio(bh->b_folio, bh->b_data) +  in nilfs_palloc_entry_offset()
426 		entry_index_in_block * NILFS_MDT(inode)->mi_entry_size;  in nilfs_palloc_entry_offset()
430  * nilfs_palloc_find_available_slot - find available slot in a group
438  * %-ENOSPC if not found.
460 		return -ENOSPC;  in nilfs_palloc_find_available_slot()
471 	return -ENOSPC;  in nilfs_palloc_find_available_slot()
475  * nilfs_palloc_rest_groups_in_desc_block - get the remaining number of groups
476  *					    in a group descriptor block
482  * block.
489 		     nilfs_palloc_groups_per_desc_block(inode) -  in nilfs_palloc_rest_groups_in_desc_block()
491 		     max - curr + 1);  in nilfs_palloc_rest_groups_in_desc_block()
495  * nilfs_palloc_count_desc_blocks - count descriptor blocks number
507 	ret = nilfs_bmap_last_key(NILFS_I(inode)->i_bmap, &blknum);  in nilfs_palloc_count_desc_blocks()
511 			NILFS_MDT(inode)->mi_blocks_per_desc_block);  in nilfs_palloc_count_desc_blocks()
516  * nilfs_palloc_mdt_file_can_grow - check potential opportunity for
531  * nilfs_palloc_count_max_entries - count max number of entries that can be
539  * * %-EIO	- I/O error (including metadata corruption).
540  * * %-ENOMEM	- Insufficient memory available.
541  * * %-ERANGE	- Number of entries in use is out of range.
562 		return -ERANGE;  in nilfs_palloc_count_max_entries()
569  * nilfs_palloc_prepare_alloc_entry - prepare to allocate a persistent object
576  * * %-EIO	- I/O error (including metadata corruption).
577  * * %-ENOMEM	- Insufficient memory available.
578  * * %-ENOSPC	- Entries exhausted (No entries available for allocation).
579  * * %-EROFS	- Read only filesystem
596 	maxgroup = ngroups - 1;  in nilfs_palloc_prepare_alloc_entry()
597 	group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset);  in nilfs_palloc_prepare_alloc_entry()
604 			maxgroup = nilfs_palloc_group(inode, req->pr_entry_nr,  in nilfs_palloc_prepare_alloc_entry()
605 						      &maxgroup_offset) - 1;  in nilfs_palloc_prepare_alloc_entry()
612 		desc = kmap_local_folio(desc_bh->b_folio, doff);  in nilfs_palloc_prepare_alloc_entry()
629 			 * Re-kmap the folio containing the first (and  in nilfs_palloc_prepare_alloc_entry()
632 			desc = kmap_local_folio(desc_bh->b_folio, doff);  in nilfs_palloc_prepare_alloc_entry()
635 			bitmap = kmap_local_folio(bitmap_bh->b_folio, boff);  in nilfs_palloc_prepare_alloc_entry()
657 	return -ENOSPC;  in nilfs_palloc_prepare_alloc_entry()
661 	nilfs_palloc_group_desc_add_entries(&desc[j], lock, -1);  in nilfs_palloc_prepare_alloc_entry()
662 	req->pr_entry_nr = entries_per_group * group + pos;  in nilfs_palloc_prepare_alloc_entry()
665 	req->pr_desc_bh = desc_bh;  in nilfs_palloc_prepare_alloc_entry()
666 	req->pr_bitmap_bh = bitmap_bh;  in nilfs_palloc_prepare_alloc_entry()
671  * nilfs_palloc_commit_alloc_entry - finish allocation of a persistent object
678 	mark_buffer_dirty(req->pr_bitmap_bh);  in nilfs_palloc_commit_alloc_entry()
679 	mark_buffer_dirty(req->pr_desc_bh);  in nilfs_palloc_commit_alloc_entry()
682 	brelse(req->pr_bitmap_bh);  in nilfs_palloc_commit_alloc_entry()
683 	brelse(req->pr_desc_bh);  in nilfs_palloc_commit_alloc_entry()
687  * nilfs_palloc_commit_free_entry - finish deallocating a persistent object
700 	group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset);  in nilfs_palloc_commit_free_entry()
701 	doff = nilfs_palloc_group_desc_offset(inode, group, req->pr_desc_bh);  in nilfs_palloc_commit_free_entry()
702 	desc = kmap_local_folio(req->pr_desc_bh->b_folio, doff);  in nilfs_palloc_commit_free_entry()
704 	boff = nilfs_palloc_bitmap_offset(req->pr_bitmap_bh);  in nilfs_palloc_commit_free_entry()
705 	bitmap = kmap_local_folio(req->pr_bitmap_bh->b_folio, boff);  in nilfs_palloc_commit_free_entry()
709 		nilfs_warn(inode->i_sb,  in nilfs_palloc_commit_free_entry()
711 			   __func__, inode->i_ino,  in nilfs_palloc_commit_free_entry()
712 			   (unsigned long long)req->pr_entry_nr);  in nilfs_palloc_commit_free_entry()
719 	mark_buffer_dirty(req->pr_desc_bh);  in nilfs_palloc_commit_free_entry()
720 	mark_buffer_dirty(req->pr_bitmap_bh);  in nilfs_palloc_commit_free_entry()
723 	brelse(req->pr_bitmap_bh);  in nilfs_palloc_commit_free_entry()
724 	brelse(req->pr_desc_bh);  in nilfs_palloc_commit_free_entry()
728  * nilfs_palloc_abort_alloc_entry - cancel allocation of a persistent object
741 	group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset);  in nilfs_palloc_abort_alloc_entry()
742 	doff = nilfs_palloc_group_desc_offset(inode, group, req->pr_desc_bh);  in nilfs_palloc_abort_alloc_entry()
743 	desc = kmap_local_folio(req->pr_desc_bh->b_folio, doff);  in nilfs_palloc_abort_alloc_entry()
745 	boff = nilfs_palloc_bitmap_offset(req->pr_bitmap_bh);  in nilfs_palloc_abort_alloc_entry()
746 	bitmap = kmap_local_folio(req->pr_bitmap_bh->b_folio, boff);  in nilfs_palloc_abort_alloc_entry()
750 		nilfs_warn(inode->i_sb,  in nilfs_palloc_abort_alloc_entry()
752 			   __func__, inode->i_ino,  in nilfs_palloc_abort_alloc_entry()
753 			   (unsigned long long)req->pr_entry_nr);  in nilfs_palloc_abort_alloc_entry()
760 	brelse(req->pr_bitmap_bh);  in nilfs_palloc_abort_alloc_entry()
761 	brelse(req->pr_desc_bh);  in nilfs_palloc_abort_alloc_entry()
763 	req->pr_entry_nr = 0;  in nilfs_palloc_abort_alloc_entry()
764 	req->pr_bitmap_bh = NULL;  in nilfs_palloc_abort_alloc_entry()
765 	req->pr_desc_bh = NULL;  in nilfs_palloc_abort_alloc_entry()
769  * nilfs_palloc_prepare_free_entry - prepare to deallocate a persistent object
782 	group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset);  in nilfs_palloc_prepare_free_entry()
792 	req->pr_desc_bh = desc_bh;  in nilfs_palloc_prepare_free_entry()
793 	req->pr_bitmap_bh = bitmap_bh;  in nilfs_palloc_prepare_free_entry()
798  * nilfs_palloc_abort_free_entry - cancel deallocating a persistent object
805 	brelse(req->pr_bitmap_bh);  in nilfs_palloc_abort_free_entry()
806 	brelse(req->pr_desc_bh);  in nilfs_palloc_abort_free_entry()
808 	req->pr_entry_nr = 0;  in nilfs_palloc_abort_free_entry()
809 	req->pr_bitmap_bh = NULL;  in nilfs_palloc_abort_free_entry()
810 	req->pr_desc_bh = NULL;  in nilfs_palloc_abort_free_entry()
814  * nilfs_palloc_freev - deallocate a set of persistent objects
830 	const unsigned int epb = NILFS_MDT(inode)->mi_entries_per_block;  in nilfs_palloc_freev()
855 		bitmap = kmap_local_folio(bitmap_bh->b_folio, boff);  in nilfs_palloc_freev()
863 				nilfs_warn(inode->i_sb,  in nilfs_palloc_freev()
865 					   __func__, inode->i_ino,  in nilfs_palloc_freev()
876 				group_offset = entry_nrs[j] - group_min_nr;  in nilfs_palloc_freev()
879 					/* This entry is in the same block */  in nilfs_palloc_freev()
884 			/* Test if the entry block is empty or not */  in nilfs_palloc_freev()
888 				last_nrs[nempties++] = entry_nrs[j - 1];  in nilfs_palloc_freev()
896 			/* Go on to the next entry block */  in nilfs_palloc_freev()
907 			if (ret && ret != -ENOENT)  in nilfs_palloc_freev()
908 				nilfs_warn(inode->i_sb,  in nilfs_palloc_freev()
909 					   "error %d deleting block that object (entry=%llu, ino=%lu) belongs to",  in nilfs_palloc_freev()
911 					   inode->i_ino);  in nilfs_palloc_freev()
915 		desc = kmap_local_folio(desc_bh->b_folio, doff);  in nilfs_palloc_freev()
924 			if (ret && ret != -ENOENT)  in nilfs_palloc_freev()
925 				nilfs_warn(inode->i_sb,  in nilfs_palloc_freev()
926 					   "error %d deleting bitmap block of group=%lu, ino=%lu",  in nilfs_palloc_freev()
927 					   ret, group, inode->i_ino);  in nilfs_palloc_freev()
934 			      struct nilfs_palloc_cache *cache)  in nilfs_palloc_setup_cache()  argument
936 	NILFS_MDT(inode)->mi_palloc_cache = cache;  in nilfs_palloc_setup_cache()
937 	spin_lock_init(&cache->lock);  in nilfs_palloc_setup_cache()
942 	struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;  in nilfs_palloc_clear_cache()  local
944 	spin_lock(&cache->lock);  in nilfs_palloc_clear_cache()
945 	brelse(cache->prev_desc.bh);  in nilfs_palloc_clear_cache()
946 	brelse(cache->prev_bitmap.bh);  in nilfs_palloc_clear_cache()
947 	brelse(cache->prev_entry.bh);  in nilfs_palloc_clear_cache()
948 	cache->prev_desc.bh = NULL;  in nilfs_palloc_clear_cache()
949 	cache->prev_bitmap.bh = NULL;  in nilfs_palloc_clear_cache()
950 	cache->prev_entry.bh = NULL;  in nilfs_palloc_clear_cache()
951 	spin_unlock(&cache->lock);  in nilfs_palloc_clear_cache()
957 	NILFS_MDT(inode)->mi_palloc_cache = NULL;  in nilfs_palloc_destroy_cache()