2 * Block data types and constants. Directly include this file only to
3 * break include dependency loop.
5 #ifndef __LINUX_BLK_TYPES_H
6 #define __LINUX_BLK_TYPES_H
10 #include <linux/types.h>
14 struct bio_integrity_payload;
18 struct cgroup_subsys_state;
19 typedef void (bio_end_io_t) (struct bio *, int);
20 typedef void (bio_destructor_t) (struct bio *);
23 * was unsigned short, but we might as well be ready for > 64kB I/O pages
28 unsigned int bv_offset;
32 sector_t bi_sector; /* device address in 512 byte
34 unsigned int bi_size; /* residual I/O count */
36 unsigned int bi_idx; /* current index into bvl_vec */
40 * main unit of I/O for the block layer and lower layers (ie drivers and
44 struct bio *bi_next; /* request queue link */
45 struct block_device *bi_bdev;
46 unsigned long bi_flags; /* status, command, etc */
47 unsigned long bi_rw; /* bottom bits READ/WRITE,
51 struct bvec_iter bi_iter;
53 /* Number of segments in this BIO after
54 * physical address coalescing is performed.
56 unsigned int bi_phys_segments;
59 * To keep track of the max segment size, we account for the
60 * sizes of the first and last mergeable segments in this bio.
62 unsigned int bi_seg_front_size;
63 unsigned int bi_seg_back_size;
65 bio_end_io_t *bi_end_io;
68 #ifdef CONFIG_BLK_CGROUP
70 * Optional ioc and css associated with this bio. Put on bio
71 * release. Read comment on top of bio_associate_current().
73 struct io_context *bi_ioc;
74 struct cgroup_subsys_state *bi_css;
76 #if defined(CONFIG_BLK_DEV_INTEGRITY)
77 struct bio_integrity_payload *bi_integrity; /* data integrity */
80 unsigned short bi_vcnt; /* how many bio_vec's */
83 * Everything starting with bi_max_vecs will be preserved by bio_reset()
86 unsigned short bi_max_vecs; /* max bvl_vecs we can hold */
88 atomic_t bi_cnt; /* pin count */
90 struct bio_vec *bi_io_vec; /* the actual vec list */
92 struct bio_set *bi_pool;
95 * We can inline a number of vecs at the end of the bio, to avoid
96 * double allocations for a small number of bio_vecs. This member
97 * MUST obviously be kept at the very end of the bio.
99 struct bio_vec bi_inline_vecs[0];
102 #define BIO_RESET_BYTES offsetof(struct bio, bi_max_vecs)
107 #define BIO_UPTODATE 0 /* ok after I/O completion */
108 #define BIO_RW_BLOCK 1 /* RW_AHEAD set, and read/write would block */
109 #define BIO_EOF 2 /* out-out-bounds error */
110 #define BIO_SEG_VALID 3 /* bi_phys_segments valid */
111 #define BIO_CLONED 4 /* doesn't own data */
112 #define BIO_BOUNCED 5 /* bio is a bounce bio */
113 #define BIO_USER_MAPPED 6 /* contains user pages */
114 #define BIO_EOPNOTSUPP 7 /* not supported */
115 #define BIO_NULL_MAPPED 8 /* contains invalid user pages */
116 #define BIO_FS_INTEGRITY 9 /* fs owns integrity data, not block layer */
117 #define BIO_QUIET 10 /* Make BIO Quiet */
118 #define BIO_MAPPED_INTEGRITY 11/* integrity metadata has been remapped */
119 #define BIO_SNAP_STABLE 12 /* bio data must be snapshotted during write */
122 * Flags starting here get preserved by bio_reset() - this includes
125 #define BIO_RESET_BITS 13
126 #define BIO_OWNS_VEC 13 /* bio_free() should free bvec */
128 #define bio_flagged(bio, flag) ((bio)->bi_flags & (1 << (flag)))
131 * top 4 bits of bio flags indicate the pool this bio came from
133 #define BIO_POOL_BITS (4)
134 #define BIO_POOL_NONE ((1UL << BIO_POOL_BITS) - 1)
135 #define BIO_POOL_OFFSET (BITS_PER_LONG - BIO_POOL_BITS)
136 #define BIO_POOL_MASK (1UL << BIO_POOL_OFFSET)
137 #define BIO_POOL_IDX(bio) ((bio)->bi_flags >> BIO_POOL_OFFSET)
139 #endif /* CONFIG_BLOCK */
142 * Request flags. For use in the cmd_flags field of struct request, and in
143 * bi_rw of struct bio. Note that some flags are only valid in either one.
147 __REQ_WRITE, /* not set, read. set, write */
148 __REQ_FAILFAST_DEV, /* no driver retries of device errors */
149 __REQ_FAILFAST_TRANSPORT, /* no driver retries of transport errors */
150 __REQ_FAILFAST_DRIVER, /* no driver retries of driver errors */
152 __REQ_SYNC, /* request is sync (sync write or read) */
153 __REQ_META, /* metadata io request */
154 __REQ_PRIO, /* boost priority in cfq */
155 __REQ_DISCARD, /* request to discard sectors */
156 __REQ_SECURE, /* secure discard (used with __REQ_DISCARD) */
157 __REQ_WRITE_SAME, /* write same block many times */
159 __REQ_NOIDLE, /* don't anticipate more IO after this one */
160 __REQ_FUA, /* forced unit access */
161 __REQ_FLUSH, /* request for cache flush */
164 __REQ_RAHEAD, /* read ahead, can fail anytime */
165 __REQ_THROTTLED, /* This bio has already been subjected to
166 * throttling rules. Don't do it again. */
168 /* request only flags */
169 __REQ_SORTED, /* elevator knows about this request */
170 __REQ_SOFTBARRIER, /* may not be passed by ioscheduler */
171 __REQ_NOMERGE, /* don't touch this for merging */
172 __REQ_STARTED, /* drive already may have started this one */
173 __REQ_DONTPREP, /* don't call prep for this one */
174 __REQ_QUEUED, /* uses queueing */
175 __REQ_ELVPRIV, /* elevator private data attached */
176 __REQ_FAILED, /* set if the request failed */
177 __REQ_QUIET, /* don't worry about errors */
178 __REQ_PREEMPT, /* set for "ide_preempt" requests */
179 __REQ_ALLOCED, /* request came from our alloc pool */
180 __REQ_COPY_USER, /* contains copies of user pages */
181 __REQ_FLUSH_SEQ, /* request for flush sequence */
182 __REQ_IO_STAT, /* account I/O stat */
183 __REQ_MIXED_MERGE, /* merge of different types, fail separately */
184 __REQ_KERNEL, /* direct IO to kernel pages */
185 __REQ_PM, /* runtime pm request */
186 __REQ_END, /* last of chain of requests */
187 __REQ_NR_BITS, /* stops here */
190 #define REQ_WRITE (1ULL << __REQ_WRITE)
191 #define REQ_FAILFAST_DEV (1ULL << __REQ_FAILFAST_DEV)
192 #define REQ_FAILFAST_TRANSPORT (1ULL << __REQ_FAILFAST_TRANSPORT)
193 #define REQ_FAILFAST_DRIVER (1ULL << __REQ_FAILFAST_DRIVER)
194 #define REQ_SYNC (1ULL << __REQ_SYNC)
195 #define REQ_META (1ULL << __REQ_META)
196 #define REQ_PRIO (1ULL << __REQ_PRIO)
197 #define REQ_DISCARD (1ULL << __REQ_DISCARD)
198 #define REQ_WRITE_SAME (1ULL << __REQ_WRITE_SAME)
199 #define REQ_NOIDLE (1ULL << __REQ_NOIDLE)
201 #define REQ_FAILFAST_MASK \
202 (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER)
203 #define REQ_COMMON_MASK \
204 (REQ_WRITE | REQ_FAILFAST_MASK | REQ_SYNC | REQ_META | REQ_PRIO | \
205 REQ_DISCARD | REQ_WRITE_SAME | REQ_NOIDLE | REQ_FLUSH | REQ_FUA | \
207 #define REQ_CLONE_MASK REQ_COMMON_MASK
209 #define BIO_NO_ADVANCE_ITER_MASK (REQ_DISCARD|REQ_WRITE_SAME)
211 /* This mask is used for both bio and request merge checking */
212 #define REQ_NOMERGE_FLAGS \
213 (REQ_NOMERGE | REQ_STARTED | REQ_SOFTBARRIER | REQ_FLUSH | REQ_FUA)
215 #define REQ_RAHEAD (1ULL << __REQ_RAHEAD)
216 #define REQ_THROTTLED (1ULL << __REQ_THROTTLED)
218 #define REQ_SORTED (1ULL << __REQ_SORTED)
219 #define REQ_SOFTBARRIER (1ULL << __REQ_SOFTBARRIER)
220 #define REQ_FUA (1ULL << __REQ_FUA)
221 #define REQ_NOMERGE (1ULL << __REQ_NOMERGE)
222 #define REQ_STARTED (1ULL << __REQ_STARTED)
223 #define REQ_DONTPREP (1ULL << __REQ_DONTPREP)
224 #define REQ_QUEUED (1ULL << __REQ_QUEUED)
225 #define REQ_ELVPRIV (1ULL << __REQ_ELVPRIV)
226 #define REQ_FAILED (1ULL << __REQ_FAILED)
227 #define REQ_QUIET (1ULL << __REQ_QUIET)
228 #define REQ_PREEMPT (1ULL << __REQ_PREEMPT)
229 #define REQ_ALLOCED (1ULL << __REQ_ALLOCED)
230 #define REQ_COPY_USER (1ULL << __REQ_COPY_USER)
231 #define REQ_FLUSH (1ULL << __REQ_FLUSH)
232 #define REQ_FLUSH_SEQ (1ULL << __REQ_FLUSH_SEQ)
233 #define REQ_IO_STAT (1ULL << __REQ_IO_STAT)
234 #define REQ_MIXED_MERGE (1ULL << __REQ_MIXED_MERGE)
235 #define REQ_SECURE (1ULL << __REQ_SECURE)
236 #define REQ_KERNEL (1ULL << __REQ_KERNEL)
237 #define REQ_PM (1ULL << __REQ_PM)
238 #define REQ_END (1ULL << __REQ_END)
240 #endif /* __LINUX_BLK_TYPES_H */