drivers/md/dm-zoned-metadata.c

22  * On-disk super block magic.
30  * On disk super block.
31  * This uses only 512 B but uses on disk a full 4KB block. This block is
33  * blocks indicating zone block validity.
35  *    (1) Super block (1 block)
51 	/* This block number */
54 	/* The number of metadata blocks, including this super block */
66 	/* The number of blocks used for the block bitmaps */
99  * Chunk mapping table metadata: 512 8-bytes entries per 4KB block.
107  * Meta data block descriptor (for cached metadata blocks).
120  * Metadata block state flags.
130  * Super block information (one per metadata set).
133 	sector_t		block;
404  * Allocate a metadata block.
426 	/* Allocate a new block */
450  * Free a metadata block.
461  * Insert a metadata block in the rbtree.
482  * Lookup a metadata block in the rbtree. If the block is found, increment
496 			 * If this is the first reference to the block,
512  * Metadata block BIO end callback.
535  * Read an uncached metadata block from disk and add it to the cache.
541 	sector_t block = zmd->sb[zmd->mblk_primary].block + mblk_no;
548 	/* Get a new block and a BIO to read it */
560 	 * the block already.
577 	bio->bi_iter.bi_sector = dmz_blk2sect(block);
640  * Release a metadata block.
666  * Get a metadata block from the rbtree. If the block
681 		/* Cache miss: read the block from disk */
700  * Mark a metadata block dirty.
711  * Issue a metadata block write BIO.
717 	sector_t block = zmd->sb[set].block + mblk->no;
728 	bio->bi_iter.bi_sector = dmz_blk2sect(block);
738  * Read/write a metadata block.
741 			  sector_t block, struct page *page)
754 	bio->bi_iter.bi_sector = dmz_blk2sect(block);
765  * Write super block of the specified metadata set.
789 	 * The metadata always references the absolute block address,
790 	 * ie relative to the entire block range, not the per-device
791 	 * block address.
805 	ret = dmz_rdwr_block(dev, REQ_OP_WRITE, zmd->sb[set].block,
872 	 * log index super block generation.
977  * Check super block.
1096  * Read the first or second super block from disk.
1100 	dmz_zmd_debug(zmd, "read superblock set %d dev %pg block %llu",
1101 		      set, sb->dev->bdev, sb->block);
1104 			      sb->block, sb->mblk->page);
1109  * This is used only if a corruption of the primary super block
1119 	/* Allocate a block */
1127 	/* Bad first super block: search for the second one */
1128 	zmd->sb[1].block = zmd->sb[0].block + zone_nr_blocks;
1136 		zmd->sb[1].block += zone_nr_blocks;
1149  * Read a super block from disk.
1156 	/* Allocate a block */
1164 	/* Read super block */
1188 		zmd->sb[0].block = dmz_start_block(zmd, zmd->sb[0].zone);
1190 		zmd->sb[1].block = dmz_start_block(zmd, zmd->sb[1].zone);
1199 				     zmd->sb[src_set].block + i, page);
1203 				     zmd->sb[dst_set].block + i, page);
1208 	/* Finalize with the super block */
1226  * Get super block from disk.
1235 		dmz_zmd_err(zmd, "Primary super block zone not set");
1239 	/* Read and check the primary super block */
1240 	zmd->sb[0].block = dmz_start_block(zmd, zmd->sb[0].zone);
1244 		dmz_dev_err(zmd->sb[0].dev, "Read primary super block failed");
1250 	/* Read and check secondary super block */
1259 		zmd->sb[1].block = dmz_start_block(zmd, zmd->sb[1].zone);
1266 		dmz_dev_err(zmd->sb[1].dev, "Read secondary super block failed");
1276 		dmz_zmd_err(zmd, "No valid super block found");
1312 		      "Using super block %u (gen %llu)",
1323 			sb->block = 0;
1328 					    "Tertiary super block zone %u not marked as metadata zone",
1336 					    "Read tertiary super block failed");
1408 				/* Primary super block zone */
1544 	 * time, determine where the super block should be: first block of the
1693 	/* Metadata block array for the chunk mapping table */
1702 			/* Get mapping block */
2124  * Write and discard change the block validity of data zones and their buffer
2401  * Get the bitmap block storing the bit for chunk_block in zone.
2477  * Validate all the blocks in the range [block..block+nr_blocks-1].
2487 	dmz_zmd_debug(zmd, "=> VALIDATE zone %u, block %llu, %u blocks",
2494 		/* Get bitmap block */
2558  * Invalidate all the blocks in the range [block..block+nr_blocks-1].
2567 	dmz_zmd_debug(zmd, "=> INVALIDATE zone %u, block %llu, %u blocks",
2573 		/* Get bitmap block */
2606  * Get a block bit value.
2616 	/* Get bitmap block */
2631  * Return the number of blocks from chunk_block to the first block with a bit
2647 		/* Get bitmap block */
2686 	/* The block is valid: get the number of valid blocks from block */
2692  * Find the first valid block from @chunk_block in @zone.
2693  * If such a block is found, its number is returned using
2756 		/* Get bitmap block */
2763 		/* Count bits in this block */
2843 		dmz_dev_info(dev, "Regular block device");
2845 		dmz_dev_info(dev, "Host-managed zoned block device");
2906 	/* Get super block */