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Linux/include/linux/blk_types.h

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Diff markup

Differences between /include/linux/blk_types.h (Version linux-4.5.7) and /include/linux/blk_types.h (Version linux-2.6.32.71)


  1 /*                                                  1 
  2  * Block data types and constants.  Directly i    
  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    
 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;        
 33                                                   
 34         unsigned int            bi_size;          
 35                                                   
 36         unsigned int            bi_idx;           
 37                                                   
 38         unsigned int            bi_bvec_done;     
 39                                                   
 40 };                                                
 41                                                   
 42 /*                                                
 43  * main unit of I/O for the block layer and lo    
 44  * stacking drivers)                              
 45  */                                               
 46 struct bio {                                      
 47         struct bio              *bi_next;         
 48         struct block_device     *bi_bdev;         
 49         unsigned int            bi_flags;         
 50         int                     bi_error;         
 51         unsigned long           bi_rw;            
 52                                                   
 53                                                   
 54                                                   
 55         struct bvec_iter        bi_iter;          
 56                                                   
 57         /* Number of segments in this BIO afte    
 58          * physical address coalescing is perf    
 59          */                                       
 60         unsigned int            bi_phys_segmen    
 61                                                   
 62         /*                                        
 63          * To keep track of the max segment si    
 64          * sizes of the first and last mergeab    
 65          */                                       
 66         unsigned int            bi_seg_front_s    
 67         unsigned int            bi_seg_back_si    
 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 wit    
 77          * release.  Read comment on top of bi    
 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 *    
 85 #endif                                            
 86         };                                        
 87                                                   
 88         unsigned short          bi_vcnt;          
 89                                                   
 90         /*                                        
 91          * Everything starting with bi_max_vec    
 92          */                                       
 93                                                   
 94         unsigned short          bi_max_vecs;      
 95                                                   
 96         atomic_t                __bi_cnt;         
 97                                                   
 98         struct bio_vec          *bi_io_vec;       
 99                                                   
100         struct bio_set          *bi_pool;         
101                                                   
102         /*                                        
103          * We can inline a number of vecs at t    
104          * double allocations for a small numb    
105          * MUST obviously be kept at the very     
106          */                                       
107         struct bio_vec          bi_inline_vecs    
108 };                                                
109                                                   
110 #define BIO_RESET_BYTES         offsetof(struc    
111                                                   
112 /*                                                
113  * bio flags                                      
114  */                                               
115 #define BIO_SEG_VALID   1       /* bi_phys_seg    
116 #define BIO_CLONED      2       /* doesn't own    
117 #define BIO_BOUNCED     3       /* bio is a bo    
118 #define BIO_USER_MAPPED 4       /* contains us    
119 #define BIO_NULL_MAPPED 5       /* contains in    
120 #define BIO_QUIET       6       /* Make BIO Qu    
121 #define BIO_CHAIN       7       /* chained bio    
122 #define BIO_REFFED      8       /* bio has ele    
123                                                   
124 /*                                                
125  * Flags starting here get preserved by bio_re    
126  * BIO_POOL_IDX()                                 
127  */                                               
128 #define BIO_RESET_BITS  13                        
129 #define BIO_OWNS_VEC    13      /* bio_free()     
130                                                   
131 /*                                                
132  * top 4 bits of bio flags indicate the pool t    
133  */                                               
134 #define BIO_POOL_BITS           (4)               
135 #define BIO_POOL_NONE           ((1UL << BIO_P    
136 #define BIO_POOL_OFFSET         (32 - BIO_POOL    
137 #define BIO_POOL_MASK           (1UL << BIO_PO    
138 #define BIO_POOL_IDX(bio)       ((bio)->bi_fla    
139                                                   
140 #endif /* CONFIG_BLOCK */                         
141                                                   
142 /*                                                
143  * Request flags.  For use in the cmd_flags fi    
144  * bi_rw of struct bio.  Note that some flags     
145  */                                               
146 enum rq_flag_bits {                               
147         /* common flags */                        
148         __REQ_WRITE,            /* not set, re    
149         __REQ_FAILFAST_DEV,     /* no driver r    
150         __REQ_FAILFAST_TRANSPORT, /* no driver    
151         __REQ_FAILFAST_DRIVER,  /* no driver r    
152                                                   
153         __REQ_SYNC,             /* request is     
154         __REQ_META,             /* metadata io    
155         __REQ_PRIO,             /* boost prior    
156         __REQ_DISCARD,          /* request to     
157         __REQ_SECURE,           /* secure disc    
158         __REQ_WRITE_SAME,       /* write same     
159                                                   
160         __REQ_NOIDLE,           /* don't antic    
161         __REQ_INTEGRITY,        /* I/O include    
162         __REQ_FUA,              /* forced unit    
163         __REQ_FLUSH,            /* request for    
164                                                   
165         /* bio only flags */                      
166         __REQ_RAHEAD,           /* read ahead,    
167         __REQ_THROTTLED,        /* This bio ha    
168                                  * throttling     
169                                                   
170         /* request only flags */                  
171         __REQ_SORTED,           /* elevator kn    
172         __REQ_SOFTBARRIER,      /* may not be     
173         __REQ_NOMERGE,          /* don't touch    
174         __REQ_STARTED,          /* drive alrea    
175         __REQ_DONTPREP,         /* don't call     
176         __REQ_QUEUED,           /* uses queuei    
177         __REQ_ELVPRIV,          /* elevator pr    
178         __REQ_FAILED,           /* set if the     
179         __REQ_QUIET,            /* don't worry    
180         __REQ_PREEMPT,          /* set for "id    
181                                    for request    
182                                    state must     
183         __REQ_ALLOCED,          /* request cam    
184         __REQ_COPY_USER,        /* contains co    
185         __REQ_FLUSH_SEQ,        /* request for    
186         __REQ_IO_STAT,          /* account I/O    
187         __REQ_MIXED_MERGE,      /* merge of di    
188         __REQ_PM,               /* runtime pm     
189         __REQ_HASHED,           /* on IO sched    
190         __REQ_MQ_INFLIGHT,      /* track infli    
191         __REQ_NR_BITS,          /* stops here     
192 };                                                
193                                                   
194 #define REQ_WRITE               (1ULL << __REQ    
195 #define REQ_FAILFAST_DEV        (1ULL << __REQ    
196 #define REQ_FAILFAST_TRANSPORT  (1ULL << __REQ    
197 #define REQ_FAILFAST_DRIVER     (1ULL << __REQ    
198 #define REQ_SYNC                (1ULL << __REQ    
199 #define REQ_META                (1ULL << __REQ    
200 #define REQ_PRIO                (1ULL << __REQ    
201 #define REQ_DISCARD             (1ULL << __REQ    
202 #define REQ_WRITE_SAME          (1ULL << __REQ    
203 #define REQ_NOIDLE              (1ULL << __REQ    
204 #define REQ_INTEGRITY           (1ULL << __REQ    
205                                                   
206 #define REQ_FAILFAST_MASK \                       
207         (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANS    
208 #define REQ_COMMON_MASK \                         
209         (REQ_WRITE | REQ_FAILFAST_MASK | REQ_S    
210          REQ_DISCARD | REQ_WRITE_SAME | REQ_NO    
211          REQ_SECURE | REQ_INTEGRITY)              
212 #define REQ_CLONE_MASK          REQ_COMMON_MAS    
213                                                   
214 #define BIO_NO_ADVANCE_ITER_MASK        (REQ_D    
215                                                   
216 /* This mask is used for both bio and request     
217 #define REQ_NOMERGE_FLAGS \                       
218         (REQ_NOMERGE | REQ_STARTED | REQ_SOFTB    
219                                                   
220 #define REQ_RAHEAD              (1ULL << __REQ    
221 #define REQ_THROTTLED           (1ULL << __REQ    
222                                                   
223 #define REQ_SORTED              (1ULL << __REQ    
224 #define REQ_SOFTBARRIER         (1ULL << __REQ    
225 #define REQ_FUA                 (1ULL << __REQ    
226 #define REQ_NOMERGE             (1ULL << __REQ    
227 #define REQ_STARTED             (1ULL << __REQ    
228 #define REQ_DONTPREP            (1ULL << __REQ    
229 #define REQ_QUEUED              (1ULL << __REQ    
230 #define REQ_ELVPRIV             (1ULL << __REQ    
231 #define REQ_FAILED              (1ULL << __REQ    
232 #define REQ_QUIET               (1ULL << __REQ    
233 #define REQ_PREEMPT             (1ULL << __REQ    
234 #define REQ_ALLOCED             (1ULL << __REQ    
235 #define REQ_COPY_USER           (1ULL << __REQ    
236 #define REQ_FLUSH               (1ULL << __REQ    
237 #define REQ_FLUSH_SEQ           (1ULL << __REQ    
238 #define REQ_IO_STAT             (1ULL << __REQ    
239 #define REQ_MIXED_MERGE         (1ULL << __REQ    
240 #define REQ_SECURE              (1ULL << __REQ    
241 #define REQ_PM                  (1ULL << __REQ    
242 #define REQ_HASHED              (1ULL << __REQ    
243 #define REQ_MQ_INFLIGHT         (1ULL << __REQ    
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 coo    
250 {                                                 
251         return cookie != BLK_QC_T_NONE;           
252 }                                                 
253                                                   
254 static inline blk_qc_t blk_tag_to_qc_t(unsigne    
255 {                                                 
256         return tag | (queue_num << BLK_QC_T_SH    
257 }                                                 
258                                                   
259 static inline unsigned int blk_qc_t_to_queue_n    
260 {                                                 
261         return cookie >> BLK_QC_T_SHIFT;          
262 }                                                 
263                                                   
264 static inline unsigned int blk_qc_t_to_tag(blk    
265 {                                                 
266         return cookie & ((1u << BLK_QC_T_SHIFT    
267 }                                                 
268                                                   
269 #endif /* __LINUX_BLK_TYPES_H */                  
270                                                   

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