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TOMOYO Linux Cross Reference
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 
 10 struct bio_set;
 11 struct bio;
 12 struct bio_integrity_payload;
 13 struct page;
 14 struct block_device;
 15 struct io_context;
 16 struct cgroup_subsys_state;
 17 typedef void (bio_end_io_t) (struct bio *);
 18 typedef void (bio_destructor_t) (struct bio *);
 19 
 20 /*
 21  * was unsigned short, but we might as well be ready for > 64kB I/O pages
 22  */
 23 struct bio_vec {
 24         struct page     *bv_page;
 25         unsigned int    bv_len;
 26         unsigned int    bv_offset;
 27 };
 28 
 29 #ifdef CONFIG_BLOCK
 30 
 31 struct bvec_iter {
 32         sector_t                bi_sector;      /* device address in 512 byte
 33                                                    sectors */
 34         unsigned int            bi_size;        /* residual I/O count */
 35 
 36         unsigned int            bi_idx;         /* current index into bvl_vec */
 37 
 38         unsigned int            bi_bvec_done;   /* number of bytes completed in
 39                                                    current bvec */
 40 };
 41 
 42 /*
 43  * main unit of I/O for the block layer and lower layers (ie drivers and
 44  * stacking drivers)
 45  */
 46 struct bio {
 47         struct bio              *bi_next;       /* request queue link */
 48         struct block_device     *bi_bdev;
 49         unsigned int            bi_flags;       /* status, command, etc */
 50         int                     bi_error;
 51         unsigned long           bi_rw;          /* bottom bits READ/WRITE,
 52                                                  * top bits priority
 53                                                  */
 54 
 55         struct bvec_iter        bi_iter;
 56 
 57         /* Number of segments in this BIO after
 58          * physical address coalescing is performed.
 59          */
 60         unsigned int            bi_phys_segments;
 61 
 62         /*
 63          * To keep track of the max segment size, we account for the
 64          * sizes of the first and last mergeable segments in this bio.
 65          */
 66         unsigned int            bi_seg_front_size;
 67         unsigned int            bi_seg_back_size;
 68 
 69         atomic_t                __bi_remaining;
 70 
 71         bio_end_io_t            *bi_end_io;
 72 
 73         void                    *bi_private;
 74 #ifdef CONFIG_BLK_CGROUP
 75         /*
 76          * Optional ioc and css associated with this bio.  Put on bio
 77          * release.  Read comment on top of bio_associate_current().
 78          */
 79         struct io_context       *bi_ioc;
 80         struct cgroup_subsys_state *bi_css;
 81 #endif
 82         union {
 83 #if defined(CONFIG_BLK_DEV_INTEGRITY)
 84                 struct bio_integrity_payload *bi_integrity; /* data integrity */
 85 #endif
 86         };
 87 
 88         unsigned short          bi_vcnt;        /* how many bio_vec's */
 89 
 90         /*
 91          * Everything starting with bi_max_vecs will be preserved by bio_reset()
 92          */
 93 
 94         unsigned short          bi_max_vecs;    /* max bvl_vecs we can hold */
 95 
 96         atomic_t                __bi_cnt;       /* pin count */
 97 
 98         struct bio_vec          *bi_io_vec;     /* the actual vec list */
 99 
100         struct bio_set          *bi_pool;
101 
102         /*
103          * We can inline a number of vecs at the end of the bio, to avoid
104          * double allocations for a small number of bio_vecs. This member
105          * MUST obviously be kept at the very end of the bio.
106          */
107         struct bio_vec          bi_inline_vecs[0];
108 };
109 
110 #define BIO_RESET_BYTES         offsetof(struct bio, bi_max_vecs)
111 
112 /*
113  * bio flags
114  */
115 #define BIO_SEG_VALID   1       /* bi_phys_segments valid */
116 #define BIO_CLONED      2       /* doesn't own data */
117 #define BIO_BOUNCED     3       /* bio is a bounce bio */
118 #define BIO_USER_MAPPED 4       /* contains user pages */
119 #define BIO_NULL_MAPPED 5       /* contains invalid user pages */
120 #define BIO_QUIET       6       /* Make BIO Quiet */
121 #define BIO_CHAIN       7       /* chained bio, ->bi_remaining in effect */
122 #define BIO_REFFED      8       /* bio has elevated ->bi_cnt */
123 
124 /*
125  * Flags starting here get preserved by bio_reset() - this includes
126  * BIO_POOL_IDX()
127  */
128 #define BIO_RESET_BITS  13
129 #define BIO_OWNS_VEC    13      /* bio_free() should free bvec */
130 
131 /*
132  * top 4 bits of bio flags indicate the pool this bio came from
133  */
134 #define BIO_POOL_BITS           (4)
135 #define BIO_POOL_NONE           ((1UL << BIO_POOL_BITS) - 1)
136 #define BIO_POOL_OFFSET         (32 - BIO_POOL_BITS)
137 #define BIO_POOL_MASK           (1UL << BIO_POOL_OFFSET)
138 #define BIO_POOL_IDX(bio)       ((bio)->bi_flags >> BIO_POOL_OFFSET)
139 
140 #endif /* CONFIG_BLOCK */
141 
142 /*
143  * Request flags.  For use in the cmd_flags field of struct request, and in
144  * bi_rw of struct bio.  Note that some flags are only valid in either one.
145  */
146 enum rq_flag_bits {
147         /* common flags */
148         __REQ_WRITE,            /* not set, read. set, write */
149         __REQ_FAILFAST_DEV,     /* no driver retries of device errors */
150         __REQ_FAILFAST_TRANSPORT, /* no driver retries of transport errors */
151         __REQ_FAILFAST_DRIVER,  /* no driver retries of driver errors */
152 
153         __REQ_SYNC,             /* request is sync (sync write or read) */
154         __REQ_META,             /* metadata io request */
155         __REQ_PRIO,             /* boost priority in cfq */
156         __REQ_DISCARD,          /* request to discard sectors */
157         __REQ_SECURE,           /* secure discard (used with __REQ_DISCARD) */
158         __REQ_WRITE_SAME,       /* write same block many times */
159 
160         __REQ_NOIDLE,           /* don't anticipate more IO after this one */
161         __REQ_INTEGRITY,        /* I/O includes block integrity payload */
162         __REQ_FUA,              /* forced unit access */
163         __REQ_FLUSH,            /* request for cache flush */
164 
165         /* bio only flags */
166         __REQ_RAHEAD,           /* read ahead, can fail anytime */
167         __REQ_THROTTLED,        /* This bio has already been subjected to
168                                  * throttling rules. Don't do it again. */
169 
170         /* request only flags */
171         __REQ_SORTED,           /* elevator knows about this request */
172         __REQ_SOFTBARRIER,      /* may not be passed by ioscheduler */
173         __REQ_NOMERGE,          /* don't touch this for merging */
174         __REQ_STARTED,          /* drive already may have started this one */
175         __REQ_DONTPREP,         /* don't call prep for this one */
176         __REQ_QUEUED,           /* uses queueing */
177         __REQ_ELVPRIV,          /* elevator private data attached */
178         __REQ_FAILED,           /* set if the request failed */
179         __REQ_QUIET,            /* don't worry about errors */
180         __REQ_PREEMPT,          /* set for "ide_preempt" requests and also
181                                    for requests for which the SCSI "quiesce"
182                                    state must be ignored. */
183         __REQ_ALLOCED,          /* request came from our alloc pool */
184         __REQ_COPY_USER,        /* contains copies of user pages */
185         __REQ_FLUSH_SEQ,        /* request for flush sequence */
186         __REQ_IO_STAT,          /* account I/O stat */
187         __REQ_MIXED_MERGE,      /* merge of different types, fail separately */
188         __REQ_PM,               /* runtime pm request */
189         __REQ_HASHED,           /* on IO scheduler merge hash */
190         __REQ_MQ_INFLIGHT,      /* track inflight for MQ */
191         __REQ_NR_BITS,          /* stops here */
192 };
193 
194 #define REQ_WRITE               (1ULL << __REQ_WRITE)
195 #define REQ_FAILFAST_DEV        (1ULL << __REQ_FAILFAST_DEV)
196 #define REQ_FAILFAST_TRANSPORT  (1ULL << __REQ_FAILFAST_TRANSPORT)
197 #define REQ_FAILFAST_DRIVER     (1ULL << __REQ_FAILFAST_DRIVER)
198 #define REQ_SYNC                (1ULL << __REQ_SYNC)
199 #define REQ_META                (1ULL << __REQ_META)
200 #define REQ_PRIO                (1ULL << __REQ_PRIO)
201 #define REQ_DISCARD             (1ULL << __REQ_DISCARD)
202 #define REQ_WRITE_SAME          (1ULL << __REQ_WRITE_SAME)
203 #define REQ_NOIDLE              (1ULL << __REQ_NOIDLE)
204 #define REQ_INTEGRITY           (1ULL << __REQ_INTEGRITY)
205 
206 #define REQ_FAILFAST_MASK \
207         (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER)
208 #define REQ_COMMON_MASK \
209         (REQ_WRITE | REQ_FAILFAST_MASK | REQ_SYNC | REQ_META | REQ_PRIO | \
210          REQ_DISCARD | REQ_WRITE_SAME | REQ_NOIDLE | REQ_FLUSH | REQ_FUA | \
211          REQ_SECURE | REQ_INTEGRITY)
212 #define REQ_CLONE_MASK          REQ_COMMON_MASK
213 
214 #define BIO_NO_ADVANCE_ITER_MASK        (REQ_DISCARD|REQ_WRITE_SAME)
215 
216 /* This mask is used for both bio and request merge checking */
217 #define REQ_NOMERGE_FLAGS \
218         (REQ_NOMERGE | REQ_STARTED | REQ_SOFTBARRIER | REQ_FLUSH | REQ_FUA | REQ_FLUSH_SEQ)
219 
220 #define REQ_RAHEAD              (1ULL << __REQ_RAHEAD)
221 #define REQ_THROTTLED           (1ULL << __REQ_THROTTLED)
222 
223 #define REQ_SORTED              (1ULL << __REQ_SORTED)
224 #define REQ_SOFTBARRIER         (1ULL << __REQ_SOFTBARRIER)
225 #define REQ_FUA                 (1ULL << __REQ_FUA)
226 #define REQ_NOMERGE             (1ULL << __REQ_NOMERGE)
227 #define REQ_STARTED             (1ULL << __REQ_STARTED)
228 #define REQ_DONTPREP            (1ULL << __REQ_DONTPREP)
229 #define REQ_QUEUED              (1ULL << __REQ_QUEUED)
230 #define REQ_ELVPRIV             (1ULL << __REQ_ELVPRIV)
231 #define REQ_FAILED              (1ULL << __REQ_FAILED)
232 #define REQ_QUIET               (1ULL << __REQ_QUIET)
233 #define REQ_PREEMPT             (1ULL << __REQ_PREEMPT)
234 #define REQ_ALLOCED             (1ULL << __REQ_ALLOCED)
235 #define REQ_COPY_USER           (1ULL << __REQ_COPY_USER)
236 #define REQ_FLUSH               (1ULL << __REQ_FLUSH)
237 #define REQ_FLUSH_SEQ           (1ULL << __REQ_FLUSH_SEQ)
238 #define REQ_IO_STAT             (1ULL << __REQ_IO_STAT)
239 #define REQ_MIXED_MERGE         (1ULL << __REQ_MIXED_MERGE)
240 #define REQ_SECURE              (1ULL << __REQ_SECURE)
241 #define REQ_PM                  (1ULL << __REQ_PM)
242 #define REQ_HASHED              (1ULL << __REQ_HASHED)
243 #define REQ_MQ_INFLIGHT         (1ULL << __REQ_MQ_INFLIGHT)
244 
245 typedef unsigned int blk_qc_t;
246 #define BLK_QC_T_NONE   -1U
247 #define BLK_QC_T_SHIFT  16
248 
249 static inline bool blk_qc_t_valid(blk_qc_t cookie)
250 {
251         return cookie != BLK_QC_T_NONE;
252 }
253 
254 static inline blk_qc_t blk_tag_to_qc_t(unsigned int tag, unsigned int queue_num)
255 {
256         return tag | (queue_num << BLK_QC_T_SHIFT);
257 }
258 
259 static inline unsigned int blk_qc_t_to_queue_num(blk_qc_t cookie)
260 {
261         return cookie >> BLK_QC_T_SHIFT;
262 }
263 
264 static inline unsigned int blk_qc_t_to_tag(blk_qc_t cookie)
265 {
266         return cookie & ((1u << BLK_QC_T_SHIFT) - 1);
267 }
268 
269 #endif /* __LINUX_BLK_TYPES_H */
270 

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