+++ /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