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![Keith Busch](/assets/img/avatar_default.png)
This patch provides a common decoder for block status path related errors that may be retried so various entities wishing to consult this do not have to duplicate this decision. Acked-by: Mike Snitzer <snitzer@redhat.com> Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Keith Busch <keith.busch@intel.com> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
375 lines
10 KiB
C
375 lines
10 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Block data types and constants. Directly include this file only to
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* break include dependency loop.
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*/
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#ifndef __LINUX_BLK_TYPES_H
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#define __LINUX_BLK_TYPES_H
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#include <linux/types.h>
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#include <linux/bvec.h>
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struct bio_set;
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struct bio;
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struct bio_integrity_payload;
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struct page;
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struct block_device;
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struct io_context;
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struct cgroup_subsys_state;
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typedef void (bio_end_io_t) (struct bio *);
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/*
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* Block error status values. See block/blk-core:blk_errors for the details.
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*/
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typedef u8 __bitwise blk_status_t;
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#define BLK_STS_OK 0
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#define BLK_STS_NOTSUPP ((__force blk_status_t)1)
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#define BLK_STS_TIMEOUT ((__force blk_status_t)2)
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#define BLK_STS_NOSPC ((__force blk_status_t)3)
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#define BLK_STS_TRANSPORT ((__force blk_status_t)4)
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#define BLK_STS_TARGET ((__force blk_status_t)5)
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#define BLK_STS_NEXUS ((__force blk_status_t)6)
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#define BLK_STS_MEDIUM ((__force blk_status_t)7)
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#define BLK_STS_PROTECTION ((__force blk_status_t)8)
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#define BLK_STS_RESOURCE ((__force blk_status_t)9)
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#define BLK_STS_IOERR ((__force blk_status_t)10)
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/* hack for device mapper, don't use elsewhere: */
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#define BLK_STS_DM_REQUEUE ((__force blk_status_t)11)
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#define BLK_STS_AGAIN ((__force blk_status_t)12)
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/**
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* blk_path_error - returns true if error may be path related
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* @error: status the request was completed with
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*
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* Description:
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* This classifies block error status into non-retryable errors and ones
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* that may be successful if retried on a failover path.
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*
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* Return:
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* %false - retrying failover path will not help
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* %true - may succeed if retried
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*/
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static inline bool blk_path_error(blk_status_t error)
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{
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switch (error) {
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case BLK_STS_NOTSUPP:
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case BLK_STS_NOSPC:
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case BLK_STS_TARGET:
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case BLK_STS_NEXUS:
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case BLK_STS_MEDIUM:
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case BLK_STS_PROTECTION:
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return false;
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}
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/* Anything else could be a path failure, so should be retried */
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return true;
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}
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struct blk_issue_stat {
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u64 stat;
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};
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/*
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* main unit of I/O for the block layer and lower layers (ie drivers and
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* stacking drivers)
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*/
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struct bio {
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struct bio *bi_next; /* request queue link */
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struct gendisk *bi_disk;
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u8 bi_partno;
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blk_status_t bi_status;
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unsigned int bi_opf; /* bottom bits req flags,
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* top bits REQ_OP. Use
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* accessors.
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*/
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unsigned short bi_flags; /* status, etc and bvec pool number */
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unsigned short bi_ioprio;
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unsigned short bi_write_hint;
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struct bvec_iter bi_iter;
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/* Number of segments in this BIO after
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* physical address coalescing is performed.
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*/
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unsigned int bi_phys_segments;
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/*
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* To keep track of the max segment size, we account for the
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* sizes of the first and last mergeable segments in this bio.
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*/
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unsigned int bi_seg_front_size;
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unsigned int bi_seg_back_size;
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atomic_t __bi_remaining;
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bio_end_io_t *bi_end_io;
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void *bi_private;
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#ifdef CONFIG_BLK_CGROUP
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/*
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* Optional ioc and css associated with this bio. Put on bio
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* release. Read comment on top of bio_associate_current().
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*/
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struct io_context *bi_ioc;
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struct cgroup_subsys_state *bi_css;
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#ifdef CONFIG_BLK_DEV_THROTTLING_LOW
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void *bi_cg_private;
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struct blk_issue_stat bi_issue_stat;
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#endif
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#endif
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union {
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#if defined(CONFIG_BLK_DEV_INTEGRITY)
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struct bio_integrity_payload *bi_integrity; /* data integrity */
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#endif
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};
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unsigned short bi_vcnt; /* how many bio_vec's */
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/*
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* Everything starting with bi_max_vecs will be preserved by bio_reset()
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*/
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unsigned short bi_max_vecs; /* max bvl_vecs we can hold */
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atomic_t __bi_cnt; /* pin count */
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struct bio_vec *bi_io_vec; /* the actual vec list */
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struct bio_set *bi_pool;
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/*
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* We can inline a number of vecs at the end of the bio, to avoid
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* double allocations for a small number of bio_vecs. This member
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* MUST obviously be kept at the very end of the bio.
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*/
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struct bio_vec bi_inline_vecs[0];
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};
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#define BIO_RESET_BYTES offsetof(struct bio, bi_max_vecs)
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/*
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* bio flags
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*/
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#define BIO_SEG_VALID 1 /* bi_phys_segments valid */
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#define BIO_CLONED 2 /* doesn't own data */
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#define BIO_BOUNCED 3 /* bio is a bounce bio */
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#define BIO_USER_MAPPED 4 /* contains user pages */
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#define BIO_NULL_MAPPED 5 /* contains invalid user pages */
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#define BIO_QUIET 6 /* Make BIO Quiet */
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#define BIO_CHAIN 7 /* chained bio, ->bi_remaining in effect */
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#define BIO_REFFED 8 /* bio has elevated ->bi_cnt */
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#define BIO_THROTTLED 9 /* This bio has already been subjected to
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* throttling rules. Don't do it again. */
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#define BIO_TRACE_COMPLETION 10 /* bio_endio() should trace the final completion
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* of this bio. */
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/* See BVEC_POOL_OFFSET below before adding new flags */
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/*
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* We support 6 different bvec pools, the last one is magic in that it
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* is backed by a mempool.
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*/
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#define BVEC_POOL_NR 6
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#define BVEC_POOL_MAX (BVEC_POOL_NR - 1)
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/*
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* Top 3 bits of bio flags indicate the pool the bvecs came from. We add
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* 1 to the actual index so that 0 indicates that there are no bvecs to be
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* freed.
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*/
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#define BVEC_POOL_BITS (3)
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#define BVEC_POOL_OFFSET (16 - BVEC_POOL_BITS)
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#define BVEC_POOL_IDX(bio) ((bio)->bi_flags >> BVEC_POOL_OFFSET)
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#if (1<< BVEC_POOL_BITS) < (BVEC_POOL_NR+1)
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# error "BVEC_POOL_BITS is too small"
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#endif
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/*
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* Flags starting here get preserved by bio_reset() - this includes
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* only BVEC_POOL_IDX()
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*/
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#define BIO_RESET_BITS BVEC_POOL_OFFSET
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typedef __u32 __bitwise blk_mq_req_flags_t;
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/*
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* Operations and flags common to the bio and request structures.
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* We use 8 bits for encoding the operation, and the remaining 24 for flags.
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*
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* The least significant bit of the operation number indicates the data
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* transfer direction:
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*
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* - if the least significant bit is set transfers are TO the device
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* - if the least significant bit is not set transfers are FROM the device
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*
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* If a operation does not transfer data the least significant bit has no
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* meaning.
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*/
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#define REQ_OP_BITS 8
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#define REQ_OP_MASK ((1 << REQ_OP_BITS) - 1)
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#define REQ_FLAG_BITS 24
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enum req_opf {
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/* read sectors from the device */
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REQ_OP_READ = 0,
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/* write sectors to the device */
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REQ_OP_WRITE = 1,
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/* flush the volatile write cache */
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REQ_OP_FLUSH = 2,
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/* discard sectors */
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REQ_OP_DISCARD = 3,
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/* get zone information */
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REQ_OP_ZONE_REPORT = 4,
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/* securely erase sectors */
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REQ_OP_SECURE_ERASE = 5,
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/* seset a zone write pointer */
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REQ_OP_ZONE_RESET = 6,
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/* write the same sector many times */
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REQ_OP_WRITE_SAME = 7,
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/* write the zero filled sector many times */
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REQ_OP_WRITE_ZEROES = 9,
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/* SCSI passthrough using struct scsi_request */
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REQ_OP_SCSI_IN = 32,
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REQ_OP_SCSI_OUT = 33,
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/* Driver private requests */
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REQ_OP_DRV_IN = 34,
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REQ_OP_DRV_OUT = 35,
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REQ_OP_LAST,
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};
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enum req_flag_bits {
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__REQ_FAILFAST_DEV = /* no driver retries of device errors */
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REQ_OP_BITS,
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__REQ_FAILFAST_TRANSPORT, /* no driver retries of transport errors */
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__REQ_FAILFAST_DRIVER, /* no driver retries of driver errors */
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__REQ_SYNC, /* request is sync (sync write or read) */
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__REQ_META, /* metadata io request */
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__REQ_PRIO, /* boost priority in cfq */
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__REQ_NOMERGE, /* don't touch this for merging */
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__REQ_IDLE, /* anticipate more IO after this one */
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__REQ_INTEGRITY, /* I/O includes block integrity payload */
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__REQ_FUA, /* forced unit access */
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__REQ_PREFLUSH, /* request for cache flush */
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__REQ_RAHEAD, /* read ahead, can fail anytime */
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__REQ_BACKGROUND, /* background IO */
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__REQ_NOWAIT, /* Don't wait if request will block */
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/* command specific flags for REQ_OP_WRITE_ZEROES: */
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__REQ_NOUNMAP, /* do not free blocks when zeroing */
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/* for driver use */
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__REQ_DRV,
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__REQ_NR_BITS, /* stops here */
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};
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#define REQ_FAILFAST_DEV (1ULL << __REQ_FAILFAST_DEV)
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#define REQ_FAILFAST_TRANSPORT (1ULL << __REQ_FAILFAST_TRANSPORT)
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#define REQ_FAILFAST_DRIVER (1ULL << __REQ_FAILFAST_DRIVER)
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#define REQ_SYNC (1ULL << __REQ_SYNC)
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#define REQ_META (1ULL << __REQ_META)
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#define REQ_PRIO (1ULL << __REQ_PRIO)
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#define REQ_NOMERGE (1ULL << __REQ_NOMERGE)
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#define REQ_IDLE (1ULL << __REQ_IDLE)
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#define REQ_INTEGRITY (1ULL << __REQ_INTEGRITY)
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#define REQ_FUA (1ULL << __REQ_FUA)
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#define REQ_PREFLUSH (1ULL << __REQ_PREFLUSH)
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#define REQ_RAHEAD (1ULL << __REQ_RAHEAD)
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#define REQ_BACKGROUND (1ULL << __REQ_BACKGROUND)
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#define REQ_NOWAIT (1ULL << __REQ_NOWAIT)
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#define REQ_NOUNMAP (1ULL << __REQ_NOUNMAP)
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#define REQ_DRV (1ULL << __REQ_DRV)
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#define REQ_FAILFAST_MASK \
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(REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER)
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#define REQ_NOMERGE_FLAGS \
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(REQ_NOMERGE | REQ_PREFLUSH | REQ_FUA)
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#define bio_op(bio) \
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((bio)->bi_opf & REQ_OP_MASK)
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#define req_op(req) \
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((req)->cmd_flags & REQ_OP_MASK)
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/* obsolete, don't use in new code */
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static inline void bio_set_op_attrs(struct bio *bio, unsigned op,
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unsigned op_flags)
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{
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bio->bi_opf = op | op_flags;
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}
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static inline bool op_is_write(unsigned int op)
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{
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return (op & 1);
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}
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/*
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* Check if the bio or request is one that needs special treatment in the
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* flush state machine.
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*/
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static inline bool op_is_flush(unsigned int op)
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{
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return op & (REQ_FUA | REQ_PREFLUSH);
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}
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/*
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* Reads are always treated as synchronous, as are requests with the FUA or
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* PREFLUSH flag. Other operations may be marked as synchronous using the
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* REQ_SYNC flag.
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*/
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static inline bool op_is_sync(unsigned int op)
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{
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return (op & REQ_OP_MASK) == REQ_OP_READ ||
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(op & (REQ_SYNC | REQ_FUA | REQ_PREFLUSH));
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}
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typedef unsigned int blk_qc_t;
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#define BLK_QC_T_NONE -1U
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#define BLK_QC_T_SHIFT 16
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#define BLK_QC_T_INTERNAL (1U << 31)
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static inline bool blk_qc_t_valid(blk_qc_t cookie)
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{
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return cookie != BLK_QC_T_NONE;
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}
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static inline blk_qc_t blk_tag_to_qc_t(unsigned int tag, unsigned int queue_num,
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bool internal)
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{
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blk_qc_t ret = tag | (queue_num << BLK_QC_T_SHIFT);
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if (internal)
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ret |= BLK_QC_T_INTERNAL;
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return ret;
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}
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static inline unsigned int blk_qc_t_to_queue_num(blk_qc_t cookie)
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{
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return (cookie & ~BLK_QC_T_INTERNAL) >> BLK_QC_T_SHIFT;
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}
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static inline unsigned int blk_qc_t_to_tag(blk_qc_t cookie)
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{
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return cookie & ((1u << BLK_QC_T_SHIFT) - 1);
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}
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static inline bool blk_qc_t_is_internal(blk_qc_t cookie)
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{
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return (cookie & BLK_QC_T_INTERNAL) != 0;
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}
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struct blk_rq_stat {
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u64 mean;
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u64 min;
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u64 max;
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u32 nr_samples;
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u64 batch;
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};
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#endif /* __LINUX_BLK_TYPES_H */
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