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