bcache: use read_cache_page_gfp to read the superblock

Avoid a pointless dependency on buffer heads in bcache by simply open coding reading a single page. Also add a SB_OFFSET define for the byte offset of the superblock instead of using magic numbers.

Christoph Hellwig committed 6 years ago

Commit 6321bef1 parent 475389a2 files · +8 −9Browse files

Showing the changes to include/uapi/linux (1 of 2 files). Show all

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include/uapi/linux/bcache.h+1−0

@@ -148,6 +148,7 @@ static inline struct bkey bkey_idx(const struct bkey k, unsigned int nr_keys) · 147 unmodified lines
148	#define BCACHE_SB_MAX_VERSION 4	148	#define BCACHE_SB_MAX_VERSION 4
149		149
150	#define SB_SECTOR 8	150	#define SB_SECTOR 8
		151	#define SB_OFFSET (SB_SECTOR << SECTOR_SHIFT)
151	#define SB_SIZE 4096	152	#define SB_SIZE 4096
152	#define SB_LABEL_SIZE 32	153	#define SB_LABEL_SIZE 32
153	#define SB_JOURNAL_BUCKETS 256U	154	#define SB_JOURNAL_BUCKETS 256U