bcachefs: Turn encoded_extent_max into a regular option

It'll now be handled at format time and in sysfs like other options - it
still can only be set at format time, though.
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>

fs/bcachefs/bcachefs.h

@@ -634,7 +634,6 @@ struct bch_fs {
 
 		u16		version;
 		u16		version_min;
-		u16		encoded_extent_max;
 
 		u8		nr_devices;
 		u8		clean;

fs/bcachefs/compress.c

@@ -26,7 +26,7 @@ static struct bbuf __bounce_alloc(struct bch_fs *c, unsigned size, int rw)
 {
 	void *b;
 
-	BUG_ON(size > c->sb.encoded_extent_max << 9);
+	BUG_ON(size > c->opts.encoded_extent_max);
 
 	b = kmalloc(size, GFP_NOIO|__GFP_NOWARN);
 	if (b)
@@ -68,7 +68,7 @@ static struct bbuf __bio_map_or_bounce(struct bch_fs *c, struct bio *bio,
 	struct page **pages = NULL;
 	void *data;
 
-	BUG_ON(bvec_iter_sectors(start) > c->sb.encoded_extent_max);
+	BUG_ON(start.bi_size > c->opts.encoded_extent_max);
 
 	if (!PageHighMem(bio_iter_page(bio, start)) &&
 	    bio_phys_contig(bio, start))
@@ -231,8 +231,8 @@ int bch2_bio_uncompress_inplace(struct bch_fs *c, struct bio *bio,
 	BUG_ON(!bio->bi_vcnt);
 	BUG_ON(DIV_ROUND_UP(crc->live_size, PAGE_SECTORS) > bio->bi_max_vecs);
 
-	if (crc->uncompressed_size	> c->sb.encoded_extent_max ||
-	    crc->compressed_size	> c->sb.encoded_extent_max) {
+	if (crc->uncompressed_size << 9	> c->opts.encoded_extent_max ||
+	    crc->compressed_size << 9	> c->opts.encoded_extent_max) {
 		bch_err(c, "error rewriting existing data: extent too big");
 		return -EIO;
 	}
@@ -272,8 +272,8 @@ int bch2_bio_uncompress(struct bch_fs *c, struct bio *src,
 	size_t dst_len = crc.uncompressed_size << 9;
 	int ret = -ENOMEM;
 
-	if (crc.uncompressed_size	> c->sb.encoded_extent_max ||
-	    crc.compressed_size		> c->sb.encoded_extent_max)
+	if (crc.uncompressed_size << 9	> c->opts.encoded_extent_max ||
+	    crc.compressed_size << 9	> c->opts.encoded_extent_max)
 		return -EIO;
 
 	dst_data = dst_len == dst_iter.bi_size
@@ -466,7 +466,7 @@ unsigned bch2_bio_compress(struct bch_fs *c,
 
 	/* Don't consume more than BCH_ENCODED_EXTENT_MAX from @src: */
 	src->bi_iter.bi_size = min_t(unsigned, src->bi_iter.bi_size,
-				     c->sb.encoded_extent_max << 9);
+				     c->opts.encoded_extent_max);
 	/* Don't generate a bigger output than input: */
 	dst->bi_iter.bi_size = min(dst->bi_iter.bi_size, src->bi_iter.bi_size);
 
@@ -544,10 +544,9 @@ void bch2_fs_compress_exit(struct bch_fs *c)
 
 static int __bch2_fs_compress_init(struct bch_fs *c, u64 features)
 {
-	size_t max_extent = c->sb.encoded_extent_max << 9;
 	size_t decompress_workspace_size = 0;
 	bool decompress_workspace_needed;
-	ZSTD_parameters params = zstd_get_params(0, max_extent);
+	ZSTD_parameters params = zstd_get_params(0, c->opts.encoded_extent_max);
 	struct {
 		unsigned	feature;
 		unsigned	type;
@@ -579,14 +578,14 @@ static int __bch2_fs_compress_init(struct bch_fs *c, u64 features)
 
 	if (!mempool_initialized(&c->compression_bounce[READ])) {
 		ret = mempool_init_kvpmalloc_pool(&c->compression_bounce[READ],
-						  1, max_extent);
+						  1, c->opts.encoded_extent_max);
 		if (ret)
 			goto out;
 	}
 
 	if (!mempool_initialized(&c->compression_bounce[WRITE])) {
 		ret = mempool_init_kvpmalloc_pool(&c->compression_bounce[WRITE],
-						  1, max_extent);
+						  1, c->opts.encoded_extent_max);
 		if (ret)
 			goto out;
 	}

fs/bcachefs/ec.c

@@ -1152,7 +1152,7 @@ static void ec_stripe_key_init(struct bch_fs *c,
 	s->v.algorithm			= 0;
 	s->v.nr_blocks			= nr_data + nr_parity;
 	s->v.nr_redundant		= nr_parity;
-	s->v.csum_granularity_bits	= ilog2(c->sb.encoded_extent_max);
+	s->v.csum_granularity_bits	= ilog2(c->opts.encoded_extent_max >> 9);
 	s->v.csum_type			= BCH_CSUM_crc32c;
 	s->v.pad			= 0;
 

fs/bcachefs/extents.c

@@ -302,7 +302,7 @@ bool bch2_extent_merge(struct bch_fs *c, struct bkey_s l, struct bkey_s_c r)
 
 			if (lp.crc.csum_type &&
 			    lp.crc.uncompressed_size +
-			    rp.crc.uncompressed_size > c->sb.encoded_extent_max)
+			    rp.crc.uncompressed_size > (c->opts.encoded_extent_max >> 9))
 				return false;
 
 			if (lp.crc.uncompressed_size + rp.crc.uncompressed_size >

fs/bcachefs/io.c

@@ -806,7 +806,7 @@ static struct bio *bch2_write_bio_alloc(struct bch_fs *c,
 	 */
 	bch2_bio_alloc_pages_pool(c, bio,
 				  min_t(unsigned, output_available,
-					c->sb.encoded_extent_max << 9));
+					c->opts.encoded_extent_max));
 
 	if (bio->bi_iter.bi_size < output_available)
 		*page_alloc_failed =
@@ -1003,8 +1003,8 @@ static int bch2_write_extent(struct bch_write_op *op, struct write_point *wp,
 		size_t dst_len, src_len;
 
 		if (page_alloc_failed &&
-		    bio_sectors(dst) < wp->sectors_free &&
-		    bio_sectors(dst) < c->sb.encoded_extent_max)
+		    dst->bi_iter.bi_size  < (wp->sectors_free << 9) &&
+		    dst->bi_iter.bi_size < c->opts.encoded_extent_max)
 			break;
 
 		BUG_ON(op->compression_type &&
@@ -1024,7 +1024,7 @@ static int bch2_write_extent(struct bch_write_op *op, struct write_point *wp,
 
 			if (op->csum_type)
 				dst_len = min_t(unsigned, dst_len,
-						c->sb.encoded_extent_max << 9);
+						c->opts.encoded_extent_max);
 
 			if (bounce) {
 				swap(dst->bi_iter.bi_size, dst_len);
@@ -2437,9 +2437,9 @@ int bch2_fs_io_init(struct bch_fs *c)
 			BIOSET_NEED_BVECS) ||
 	    mempool_init_page_pool(&c->bio_bounce_pages,
 				   max_t(unsigned,
-					 btree_sectors(c),
-					 c->sb.encoded_extent_max) /
-				   PAGE_SECTORS, 0) ||
+					 c->opts.btree_node_size,
+					 c->opts.encoded_extent_max) /
+				   PAGE_SIZE, 0) ||
 	    rhashtable_init(&c->promote_table, &bch_promote_params))
 		return -ENOMEM;
 

fs/bcachefs/opts.h

@@ -127,6 +127,12 @@ enum opt_type {
 	  OPT_UINT(1, BCH_REPLICAS_MAX),				\
 	  BCH_SB_DATA_REPLICAS_REQ,	1,				\
 	  "#",		NULL)						\
+	x(encoded_extent_max,		u32,				\
+	  OPT_FS|OPT_FORMAT|						\
+	  OPT_HUMAN_READABLE|OPT_MUST_BE_POW_2|OPT_SB_FIELD_SECTORS|OPT_SB_FIELD_ILOG2,\
+	  OPT_UINT(4096, 2U << 20),					\
+	  BCH_SB_ENCODED_EXTENT_MAX_BITS, 64 << 10,			\
+	  "size",	"Maximum size of checksummed/compressed extents")\
 	x(metadata_checksum,		u8,				\
 	  OPT_FS|OPT_FORMAT|OPT_MOUNT|OPT_RUNTIME,			\
 	  OPT_STR(bch2_csum_opts),					\

fs/bcachefs/super-io.c

@@ -368,7 +368,6 @@ static void bch2_sb_update(struct bch_fs *c)
 	c->sb.nr_devices	= src->nr_devices;
 	c->sb.clean		= BCH_SB_CLEAN(src);
 	c->sb.encryption_type	= BCH_SB_ENCRYPTION_TYPE(src);
-	c->sb.encoded_extent_max= 1 << BCH_SB_ENCODED_EXTENT_MAX_BITS(src);
 
 	c->sb.nsec_per_time_unit = le32_to_cpu(src->time_precision);
 	c->sb.time_units_per_sec = NSEC_PER_SEC / c->sb.nsec_per_time_unit;