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Linux/include/linux/blk_types.h

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  1 /*
  2  * Block data types and constants.  Directly include this file only to
  3  * break include dependency loop.
  4  */
  5 #ifndef __LINUX_BLK_TYPES_H
  6 #define __LINUX_BLK_TYPES_H
  7 
  8 #include <linux/types.h>
  9 #include <linux/bvec.h>
 10 
 11 struct bio_set;
 12 struct bio;
 13 struct bio_integrity_payload;
 14 struct page;
 15 struct block_device;
 16 struct io_context;
 17 struct cgroup_subsys_state;
 18 typedef void (bio_end_io_t) (struct bio *);
 19 
 20 /*
 21  * main unit of I/O for the block layer and lower layers (ie drivers and
 22  * stacking drivers)
 23  */
 24 struct bio {
 25         struct bio              *bi_next;       /* request queue link */
 26         struct block_device     *bi_bdev;
 27         int                     bi_error;
 28         unsigned int            bi_opf;         /* bottom bits req flags,
 29                                                  * top bits REQ_OP. Use
 30                                                  * accessors.
 31                                                  */
 32         unsigned short          bi_flags;       /* status, command, etc */
 33         unsigned short          bi_ioprio;
 34 
 35         struct bvec_iter        bi_iter;
 36 
 37         /* Number of segments in this BIO after
 38          * physical address coalescing is performed.
 39          */
 40         unsigned int            bi_phys_segments;
 41 
 42         /*
 43          * To keep track of the max segment size, we account for the
 44          * sizes of the first and last mergeable segments in this bio.
 45          */
 46         unsigned int            bi_seg_front_size;
 47         unsigned int            bi_seg_back_size;
 48 
 49         atomic_t                __bi_remaining;
 50 
 51         bio_end_io_t            *bi_end_io;
 52 
 53         void                    *bi_private;
 54 #ifdef CONFIG_BLK_CGROUP
 55         /*
 56          * Optional ioc and css associated with this bio.  Put on bio
 57          * release.  Read comment on top of bio_associate_current().
 58          */
 59         struct io_context       *bi_ioc;
 60         struct cgroup_subsys_state *bi_css;
 61 #endif
 62         union {
 63 #if defined(CONFIG_BLK_DEV_INTEGRITY)
 64                 struct bio_integrity_payload *bi_integrity; /* data integrity */
 65 #endif
 66         };
 67 
 68         unsigned short          bi_vcnt;        /* how many bio_vec's */
 69 
 70         /*
 71          * Everything starting with bi_max_vecs will be preserved by bio_reset()
 72          */
 73 
 74         unsigned short          bi_max_vecs;    /* max bvl_vecs we can hold */
 75 
 76         atomic_t                __bi_cnt;       /* pin count */
 77 
 78         struct bio_vec          *bi_io_vec;     /* the actual vec list */
 79 
 80         struct bio_set          *bi_pool;
 81 
 82         /*
 83          * We can inline a number of vecs at the end of the bio, to avoid
 84          * double allocations for a small number of bio_vecs. This member
 85          * MUST obviously be kept at the very end of the bio.
 86          */
 87         struct bio_vec          bi_inline_vecs[0];
 88 };
 89 
 90 #define BIO_RESET_BYTES         offsetof(struct bio, bi_max_vecs)
 91 
 92 /*
 93  * bio flags
 94  */
 95 #define BIO_SEG_VALID   1       /* bi_phys_segments valid */
 96 #define BIO_CLONED      2       /* doesn't own data */
 97 #define BIO_BOUNCED     3       /* bio is a bounce bio */
 98 #define BIO_USER_MAPPED 4       /* contains user pages */
 99 #define BIO_NULL_MAPPED 5       /* contains invalid user pages */
100 #define BIO_QUIET       6       /* Make BIO Quiet */
101 #define BIO_CHAIN       7       /* chained bio, ->bi_remaining in effect */
102 #define BIO_REFFED      8       /* bio has elevated ->bi_cnt */
103 #define BIO_THROTTLED   9       /* This bio has already been subjected to
104                                  * throttling rules. Don't do it again. */
105 
106 /*
107  * Flags starting here get preserved by bio_reset() - this includes
108  * BVEC_POOL_IDX()
109  */
110 #define BIO_RESET_BITS  10
111 
112 /*
113  * We support 6 different bvec pools, the last one is magic in that it
114  * is backed by a mempool.
115  */
116 #define BVEC_POOL_NR            6
117 #define BVEC_POOL_MAX           (BVEC_POOL_NR - 1)
118 
119 /*
120  * Top 4 bits of bio flags indicate the pool the bvecs came from.  We add
121  * 1 to the actual index so that 0 indicates that there are no bvecs to be
122  * freed.
123  */
124 #define BVEC_POOL_BITS          (4)
125 #define BVEC_POOL_OFFSET        (16 - BVEC_POOL_BITS)
126 #define BVEC_POOL_IDX(bio)      ((bio)->bi_flags >> BVEC_POOL_OFFSET)
127 
128 /*
129  * Operations and flags common to the bio and request structures.
130  * We use 8 bits for encoding the operation, and the remaining 24 for flags.
131  *
132  * The least significant bit of the operation number indicates the data
133  * transfer direction:
134  *
135  *   - if the least significant bit is set transfers are TO the device
136  *   - if the least significant bit is not set transfers are FROM the device
137  *
138  * If a operation does not transfer data the least significant bit has no
139  * meaning.
140  */
141 #define REQ_OP_BITS     8
142 #define REQ_OP_MASK     ((1 << REQ_OP_BITS) - 1)
143 #define REQ_FLAG_BITS   24
144 
145 enum req_opf {
146         /* read sectors from the device */
147         REQ_OP_READ             = 0,
148         /* write sectors to the device */
149         REQ_OP_WRITE            = 1,
150         /* flush the volatile write cache */
151         REQ_OP_FLUSH            = 2,
152         /* discard sectors */
153         REQ_OP_DISCARD          = 3,
154         /* get zone information */
155         REQ_OP_ZONE_REPORT      = 4,
156         /* securely erase sectors */
157         REQ_OP_SECURE_ERASE     = 5,
158         /* seset a zone write pointer */
159         REQ_OP_ZONE_RESET       = 6,
160         /* write the same sector many times */
161         REQ_OP_WRITE_SAME       = 7,
162         /* write the zero filled sector many times */
163         REQ_OP_WRITE_ZEROES     = 8,
164 
165         REQ_OP_LAST,
166 };
167 
168 enum req_flag_bits {
169         __REQ_FAILFAST_DEV =    /* no driver retries of device errors */
170                 REQ_OP_BITS,
171         __REQ_FAILFAST_TRANSPORT, /* no driver retries of transport errors */
172         __REQ_FAILFAST_DRIVER,  /* no driver retries of driver errors */
173         __REQ_SYNC,             /* request is sync (sync write or read) */
174         __REQ_META,             /* metadata io request */
175         __REQ_PRIO,             /* boost priority in cfq */
176         __REQ_NOMERGE,          /* don't touch this for merging */
177         __REQ_IDLE,             /* anticipate more IO after this one */
178         __REQ_INTEGRITY,        /* I/O includes block integrity payload */
179         __REQ_FUA,              /* forced unit access */
180         __REQ_PREFLUSH,         /* request for cache flush */
181         __REQ_RAHEAD,           /* read ahead, can fail anytime */
182         __REQ_BACKGROUND,       /* background IO */
183         __REQ_NR_BITS,          /* stops here */
184 };
185 
186 #define REQ_FAILFAST_DEV        (1ULL << __REQ_FAILFAST_DEV)
187 #define REQ_FAILFAST_TRANSPORT  (1ULL << __REQ_FAILFAST_TRANSPORT)
188 #define REQ_FAILFAST_DRIVER     (1ULL << __REQ_FAILFAST_DRIVER)
189 #define REQ_SYNC                (1ULL << __REQ_SYNC)
190 #define REQ_META                (1ULL << __REQ_META)
191 #define REQ_PRIO                (1ULL << __REQ_PRIO)
192 #define REQ_NOMERGE             (1ULL << __REQ_NOMERGE)
193 #define REQ_IDLE                (1ULL << __REQ_IDLE)
194 #define REQ_INTEGRITY           (1ULL << __REQ_INTEGRITY)
195 #define REQ_FUA                 (1ULL << __REQ_FUA)
196 #define REQ_PREFLUSH            (1ULL << __REQ_PREFLUSH)
197 #define REQ_RAHEAD              (1ULL << __REQ_RAHEAD)
198 #define REQ_BACKGROUND          (1ULL << __REQ_BACKGROUND)
199 
200 #define REQ_FAILFAST_MASK \
201         (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER)
202 
203 #define REQ_NOMERGE_FLAGS \
204         (REQ_NOMERGE | REQ_PREFLUSH | REQ_FUA)
205 
206 #define bio_op(bio) \
207         ((bio)->bi_opf & REQ_OP_MASK)
208 #define req_op(req) \
209         ((req)->cmd_flags & REQ_OP_MASK)
210 
211 /* obsolete, don't use in new code */
212 static inline void bio_set_op_attrs(struct bio *bio, unsigned op,
213                 unsigned op_flags)
214 {
215         bio->bi_opf = op | op_flags;
216 }
217 
218 static inline bool op_is_write(unsigned int op)
219 {
220         return (op & 1);
221 }
222 
223 /*
224  * Reads are always treated as synchronous, as are requests with the FUA or
225  * PREFLUSH flag.  Other operations may be marked as synchronous using the
226  * REQ_SYNC flag.
227  */
228 static inline bool op_is_sync(unsigned int op)
229 {
230         return (op & REQ_OP_MASK) == REQ_OP_READ ||
231                 (op & (REQ_SYNC | REQ_FUA | REQ_PREFLUSH));
232 }
233 
234 typedef unsigned int blk_qc_t;
235 #define BLK_QC_T_NONE   -1U
236 #define BLK_QC_T_SHIFT  16
237 
238 static inline bool blk_qc_t_valid(blk_qc_t cookie)
239 {
240         return cookie != BLK_QC_T_NONE;
241 }
242 
243 static inline blk_qc_t blk_tag_to_qc_t(unsigned int tag, unsigned int queue_num)
244 {
245         return tag | (queue_num << BLK_QC_T_SHIFT);
246 }
247 
248 static inline unsigned int blk_qc_t_to_queue_num(blk_qc_t cookie)
249 {
250         return cookie >> BLK_QC_T_SHIFT;
251 }
252 
253 static inline unsigned int blk_qc_t_to_tag(blk_qc_t cookie)
254 {
255         return cookie & ((1u << BLK_QC_T_SHIFT) - 1);
256 }
257 
258 struct blk_issue_stat {
259         u64 time;
260 };
261 
262 #define BLK_RQ_STAT_BATCH       64
263 
264 struct blk_rq_stat {
265         s64 mean;
266         u64 min;
267         u64 max;
268         s32 nr_samples;
269         s32 nr_batch;
270         u64 batch;
271         s64 time;
272 };
273 
274 #endif /* __LINUX_BLK_TYPES_H */
275 

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