--- /dev/null
+/*
+ * Block data types and constants. Directly include this file only to
+ * break include dependency loop.
+ */
+#ifndef __LINUX_BLK_TYPES_H
+#define __LINUX_BLK_TYPES_H
+
+#include <linux/atomic.h>
+#include <linux/types.h>
+#include <linux/bvec.h>
+#include <linux/kobject.h>
+
+struct bio_set;
+struct bio;
+typedef void (bio_end_io_t) (struct bio *);
+
+#define BDEVNAME_SIZE 32
+
+struct request_queue {
+ struct backing_dev_info *backing_dev_info;
+};
+
+struct gendisk {
+ struct backing_dev_info *bdi;
+ struct backing_dev_info __bdi;
+};
+
+struct hd_struct {
+ struct kobject kobj;
+};
+
+struct block_device {
+ struct kobject kobj;
+ dev_t bd_dev;
+ char name[BDEVNAME_SIZE];
+ struct inode *bd_inode;
+ struct request_queue queue;
+ void *bd_holder;
+ struct gendisk * bd_disk;
+ struct gendisk __bd_disk;
+ int bd_fd;
+};
+
+#define bdev_kobj(_bdev) (&((_bdev)->kobj))
+
+/*
+ * Block error status values. See block/blk-core:blk_errors for the details.
+ */
+typedef u8 __bitwise blk_status_t;
+#define BLK_STS_OK 0
+#define BLK_STS_NOTSUPP ((__force blk_status_t)1)
+#define BLK_STS_TIMEOUT ((__force blk_status_t)2)
+#define BLK_STS_NOSPC ((__force blk_status_t)3)
+#define BLK_STS_TRANSPORT ((__force blk_status_t)4)
+#define BLK_STS_TARGET ((__force blk_status_t)5)
+#define BLK_STS_NEXUS ((__force blk_status_t)6)
+#define BLK_STS_MEDIUM ((__force blk_status_t)7)
+#define BLK_STS_PROTECTION ((__force blk_status_t)8)
+#define BLK_STS_RESOURCE ((__force blk_status_t)9)
+#define BLK_STS_IOERR ((__force blk_status_t)10)
+
+/* hack for device mapper, don't use elsewhere: */
+#define BLK_STS_DM_REQUEUE ((__force blk_status_t)11)
+
+#define BLK_STS_AGAIN ((__force blk_status_t)12)
+
+#define BIO_INLINE_VECS 4
+
+/*
+ * main unit of I/O for the block layer and lower layers (ie drivers and
+ * stacking drivers)
+ */
+struct bio {
+ struct bio *bi_next; /* request queue link */
+ struct block_device *bi_bdev;
+ blk_status_t bi_status;
+ unsigned int bi_opf; /* bottom bits req flags,
+ * top bits REQ_OP. Use
+ * accessors.
+ */
+ unsigned short bi_flags; /* status, command, etc */
+ unsigned short bi_ioprio;
+
+ struct bvec_iter bi_iter;
+
+ atomic_t __bi_remaining;
+
+ bio_end_io_t *bi_end_io;
+ void *bi_private;
+
+ unsigned short bi_vcnt; /* how many bio_vec's */
+
+ /*
+ * Everything starting with bi_max_vecs will be preserved by bio_reset()
+ */
+
+ unsigned short bi_max_vecs; /* max bvl_vecs we can hold */
+
+ atomic_t __bi_cnt; /* pin count */
+
+ struct bio_vec *bi_io_vec; /* the actual vec list */
+
+ struct bio_set *bi_pool;
+
+ /*
+ * We can inline a number of vecs at the end of the bio, to avoid
+ * double allocations for a small number of bio_vecs. This member
+ * MUST obviously be kept at the very end of the bio.
+ */
+ struct bio_vec bi_inline_vecs[0];
+};
+
+#define BIO_RESET_BYTES offsetof(struct bio, bi_max_vecs)
+
+/*
+ * bio flags
+ */
+#define BIO_SEG_VALID 1 /* bi_phys_segments valid */
+#define BIO_CLONED 2 /* doesn't own data */
+#define BIO_BOUNCED 3 /* bio is a bounce bio */
+#define BIO_USER_MAPPED 4 /* contains user pages */
+#define BIO_NULL_MAPPED 5 /* contains invalid user pages */
+#define BIO_QUIET 6 /* Make BIO Quiet */
+#define BIO_CHAIN 7 /* chained bio, ->bi_remaining in effect */
+#define BIO_REFFED 8 /* bio has elevated ->bi_cnt */
+
+/*
+ * Flags starting here get preserved by bio_reset() - this includes
+ * BVEC_POOL_IDX()
+ */
+#define BIO_RESET_BITS 10
+
+/*
+ * We support 6 different bvec pools, the last one is magic in that it
+ * is backed by a mempool.
+ */
+#define BVEC_POOL_NR 6
+#define BVEC_POOL_MAX (BVEC_POOL_NR - 1)
+
+/*
+ * Top 4 bits of bio flags indicate the pool the bvecs came from. We add
+ * 1 to the actual index so that 0 indicates that there are no bvecs to be
+ * freed.
+ */
+#define BVEC_POOL_BITS (4)
+#define BVEC_POOL_OFFSET (16 - BVEC_POOL_BITS)
+#define BVEC_POOL_IDX(bio) ((bio)->bi_flags >> BVEC_POOL_OFFSET)
+
+/*
+ * Operations and flags common to the bio and request structures.
+ * We use 8 bits for encoding the operation, and the remaining 24 for flags.
+ *
+ * The least significant bit of the operation number indicates the data
+ * transfer direction:
+ *
+ * - if the least significant bit is set transfers are TO the device
+ * - if the least significant bit is not set transfers are FROM the device
+ *
+ * If a operation does not transfer data the least significant bit has no
+ * meaning.
+ */
+#define REQ_OP_BITS 8
+#define REQ_OP_MASK ((1 << REQ_OP_BITS) - 1)
+#define REQ_FLAG_BITS 24
+
+enum req_opf {
+ /* read sectors from the device */
+ REQ_OP_READ = 0,
+ /* write sectors to the device */
+ REQ_OP_WRITE = 1,
+ /* flush the volatile write cache */
+ REQ_OP_FLUSH = 2,
+ /* discard sectors */
+ REQ_OP_DISCARD = 3,
+ /* get zone information */
+ REQ_OP_ZONE_REPORT = 4,
+ /* securely erase sectors */
+ REQ_OP_SECURE_ERASE = 5,
+ /* seset a zone write pointer */
+ REQ_OP_ZONE_RESET = 6,
+ /* write the same sector many times */
+ REQ_OP_WRITE_SAME = 7,
+ /* write the zero filled sector many times */
+ REQ_OP_WRITE_ZEROES = 8,
+
+ /* SCSI passthrough using struct scsi_request */
+ REQ_OP_SCSI_IN = 32,
+ REQ_OP_SCSI_OUT = 33,
+ /* Driver private requests */
+ REQ_OP_DRV_IN = 34,
+ REQ_OP_DRV_OUT = 35,
+
+ REQ_OP_LAST,
+};
+
+enum req_flag_bits {
+ __REQ_FAILFAST_DEV = /* no driver retries of device errors */
+ REQ_OP_BITS,
+ __REQ_FAILFAST_TRANSPORT, /* no driver retries of transport errors */
+ __REQ_FAILFAST_DRIVER, /* no driver retries of driver errors */
+ __REQ_SYNC, /* request is sync (sync write or read) */
+ __REQ_META, /* metadata io request */
+ __REQ_PRIO, /* boost priority in cfq */
+ __REQ_NOMERGE, /* don't touch this for merging */
+ __REQ_IDLE, /* anticipate more IO after this one */
+ __REQ_INTEGRITY, /* I/O includes block integrity payload */
+ __REQ_FUA, /* forced unit access */
+ __REQ_PREFLUSH, /* request for cache flush */
+ __REQ_RAHEAD, /* read ahead, can fail anytime */
+ __REQ_BACKGROUND, /* background IO */
+ __REQ_NR_BITS, /* stops here */
+};
+
+#define REQ_SYNC (1ULL << __REQ_SYNC)
+#define REQ_META (1ULL << __REQ_META)
+#define REQ_PRIO (1ULL << __REQ_PRIO)
+
+#define REQ_NOMERGE_FLAGS (REQ_PREFLUSH | REQ_FUA)
+
+#define bio_op(bio) \
+ ((bio)->bi_opf & REQ_OP_MASK)
+
+static inline void bio_set_op_attrs(struct bio *bio, unsigned op,
+ unsigned op_flags)
+{
+ bio->bi_opf = op | op_flags;
+}
+
+#define REQ_RAHEAD (1ULL << __REQ_RAHEAD)
+#define REQ_THROTTLED (1ULL << __REQ_THROTTLED)
+
+#define REQ_FUA (1ULL << __REQ_FUA)
+#define REQ_PREFLUSH (1ULL << __REQ_PREFLUSH)
+
+#define RW_MASK REQ_OP_WRITE
+
+#define READ REQ_OP_READ
+#define WRITE REQ_OP_WRITE
+
+#define READ_SYNC REQ_SYNC
+#define WRITE_SYNC (REQ_SYNC)
+#define WRITE_ODIRECT REQ_SYNC
+#define WRITE_FLUSH (REQ_SYNC | REQ_PREFLUSH)
+#define WRITE_FUA (REQ_SYNC | REQ_FUA)
+#define WRITE_FLUSH_FUA (REQ_SYNC | REQ_PREFLUSH | REQ_FUA)
+
+#endif /* __LINUX_BLK_TYPES_H */
projects / bcachefs-tools-debian / blobdiff