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-rw-r--r--include/linux/bio.h183
1 files changed, 4 insertions, 179 deletions
diff --git a/include/linux/bio.h b/include/linux/bio.h
index f655b54c9ef3..5274103434ad 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -9,7 +9,7 @@
9 * 9 *
10 * This program is distributed in the hope that it will be useful, 10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 12 *
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details. 14 * GNU General Public License for more details.
15 * 15 *
@@ -28,6 +28,9 @@
28 28
29#include <asm/io.h> 29#include <asm/io.h>
30 30
31/* struct bio, bio_vec and BIO_* flags are defined in blk_types.h */
32#include <linux/blk_types.h>
33
31#define BIO_DEBUG 34#define BIO_DEBUG
32 35
33#ifdef BIO_DEBUG 36#ifdef BIO_DEBUG
@@ -41,184 +44,6 @@
41#define BIO_MAX_SECTORS (BIO_MAX_SIZE >> 9) 44#define BIO_MAX_SECTORS (BIO_MAX_SIZE >> 9)
42 45
43/* 46/*
44 * was unsigned short, but we might as well be ready for > 64kB I/O pages
45 */
46struct bio_vec {
47 struct page *bv_page;
48 unsigned int bv_len;
49 unsigned int bv_offset;
50};
51
52struct bio_set;
53struct bio;
54struct bio_integrity_payload;
55typedef void (bio_end_io_t) (struct bio *, int);
56typedef void (bio_destructor_t) (struct bio *);
57
58/*
59 * main unit of I/O for the block layer and lower layers (ie drivers and
60 * stacking drivers)
61 */
62struct bio {
63 sector_t bi_sector; /* device address in 512 byte
64 sectors */
65 struct bio *bi_next; /* request queue link */
66 struct block_device *bi_bdev;
67 unsigned long bi_flags; /* status, command, etc */
68 unsigned long bi_rw; /* bottom bits READ/WRITE,
69 * top bits priority
70 */
71
72 unsigned short bi_vcnt; /* how many bio_vec's */
73 unsigned short bi_idx; /* current index into bvl_vec */
74
75 /* Number of segments in this BIO after
76 * physical address coalescing is performed.
77 */
78 unsigned int bi_phys_segments;
79
80 unsigned int bi_size; /* residual I/O count */
81
82 /*
83 * To keep track of the max segment size, we account for the
84 * sizes of the first and last mergeable segments in this bio.
85 */
86 unsigned int bi_seg_front_size;
87 unsigned int bi_seg_back_size;
88
89 unsigned int bi_max_vecs; /* max bvl_vecs we can hold */
90
91 unsigned int bi_comp_cpu; /* completion CPU */
92
93 atomic_t bi_cnt; /* pin count */
94
95 struct bio_vec *bi_io_vec; /* the actual vec list */
96
97 bio_end_io_t *bi_end_io;
98
99 void *bi_private;
100#if defined(CONFIG_BLK_DEV_INTEGRITY)
101 struct bio_integrity_payload *bi_integrity; /* data integrity */
102#endif
103
104 bio_destructor_t *bi_destructor; /* destructor */
105
106 /*
107 * We can inline a number of vecs at the end of the bio, to avoid
108 * double allocations for a small number of bio_vecs. This member
109 * MUST obviously be kept at the very end of the bio.
110 */
111 struct bio_vec bi_inline_vecs[0];
112};
113
114/*
115 * bio flags
116 */
117#define BIO_UPTODATE 0 /* ok after I/O completion */
118#define BIO_RW_BLOCK 1 /* RW_AHEAD set, and read/write would block */
119#define BIO_EOF 2 /* out-out-bounds error */
120#define BIO_SEG_VALID 3 /* bi_phys_segments valid */
121#define BIO_CLONED 4 /* doesn't own data */
122#define BIO_BOUNCED 5 /* bio is a bounce bio */
123#define BIO_USER_MAPPED 6 /* contains user pages */
124#define BIO_EOPNOTSUPP 7 /* not supported */
125#define BIO_CPU_AFFINE 8 /* complete bio on same CPU as submitted */
126#define BIO_NULL_MAPPED 9 /* contains invalid user pages */
127#define BIO_FS_INTEGRITY 10 /* fs owns integrity data, not block layer */
128#define BIO_QUIET 11 /* Make BIO Quiet */
129#define bio_flagged(bio, flag) ((bio)->bi_flags & (1 << (flag)))
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 (BITS_PER_LONG - 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/*
141 * Request flags. For use in the cmd_flags field of struct request, and in
142 * bi_rw of struct bio. Note that some flags are only valid in either one.
143 */
144enum rq_flag_bits {
145 /* common flags */
146 __REQ_WRITE, /* not set, read. set, write */
147 __REQ_FAILFAST_DEV, /* no driver retries of device errors */
148 __REQ_FAILFAST_TRANSPORT, /* no driver retries of transport errors */
149 __REQ_FAILFAST_DRIVER, /* no driver retries of driver errors */
150
151 __REQ_HARDBARRIER, /* may not be passed by drive either */
152 __REQ_SYNC, /* request is sync (sync write or read) */
153 __REQ_META, /* metadata io request */
154 __REQ_DISCARD, /* request to discard sectors */
155 __REQ_NOIDLE, /* don't anticipate more IO after this one */
156
157 /* bio only flags */
158 __REQ_UNPLUG, /* unplug the immediately after submission */
159 __REQ_RAHEAD, /* read ahead, can fail anytime */
160
161 /* request only flags */
162 __REQ_SORTED, /* elevator knows about this request */
163 __REQ_SOFTBARRIER, /* may not be passed by ioscheduler */
164 __REQ_FUA, /* forced unit access */
165 __REQ_NOMERGE, /* don't touch this for merging */
166 __REQ_STARTED, /* drive already may have started this one */
167 __REQ_DONTPREP, /* don't call prep for this one */
168 __REQ_QUEUED, /* uses queueing */
169 __REQ_ELVPRIV, /* elevator private data attached */
170 __REQ_FAILED, /* set if the request failed */
171 __REQ_QUIET, /* don't worry about errors */
172 __REQ_PREEMPT, /* set for "ide_preempt" requests */
173 __REQ_ORDERED_COLOR, /* is before or after barrier */
174 __REQ_ALLOCED, /* request came from our alloc pool */
175 __REQ_COPY_USER, /* contains copies of user pages */
176 __REQ_INTEGRITY, /* integrity metadata has been remapped */
177 __REQ_FLUSH, /* request for cache flush */
178 __REQ_IO_STAT, /* account I/O stat */
179 __REQ_MIXED_MERGE, /* merge of different types, fail separately */
180 __REQ_NR_BITS, /* stops here */
181};
182
183#define REQ_WRITE (1 << __REQ_WRITE)
184#define REQ_FAILFAST_DEV (1 << __REQ_FAILFAST_DEV)
185#define REQ_FAILFAST_TRANSPORT (1 << __REQ_FAILFAST_TRANSPORT)
186#define REQ_FAILFAST_DRIVER (1 << __REQ_FAILFAST_DRIVER)
187#define REQ_HARDBARRIER (1 << __REQ_HARDBARRIER)
188#define REQ_SYNC (1 << __REQ_SYNC)
189#define REQ_META (1 << __REQ_META)
190#define REQ_DISCARD (1 << __REQ_DISCARD)
191#define REQ_NOIDLE (1 << __REQ_NOIDLE)
192
193#define REQ_FAILFAST_MASK \
194 (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER)
195#define REQ_COMMON_MASK \
196 (REQ_WRITE | REQ_FAILFAST_MASK | REQ_HARDBARRIER | REQ_SYNC | \
197 REQ_META| REQ_DISCARD | REQ_NOIDLE)
198
199#define REQ_UNPLUG (1 << __REQ_UNPLUG)
200#define REQ_RAHEAD (1 << __REQ_RAHEAD)
201
202#define REQ_SORTED (1 << __REQ_SORTED)
203#define REQ_SOFTBARRIER (1 << __REQ_SOFTBARRIER)
204#define REQ_FUA (1 << __REQ_FUA)
205#define REQ_NOMERGE (1 << __REQ_NOMERGE)
206#define REQ_STARTED (1 << __REQ_STARTED)
207#define REQ_DONTPREP (1 << __REQ_DONTPREP)
208#define REQ_QUEUED (1 << __REQ_QUEUED)
209#define REQ_ELVPRIV (1 << __REQ_ELVPRIV)
210#define REQ_FAILED (1 << __REQ_FAILED)
211#define REQ_QUIET (1 << __REQ_QUIET)
212#define REQ_PREEMPT (1 << __REQ_PREEMPT)
213#define REQ_ORDERED_COLOR (1 << __REQ_ORDERED_COLOR)
214#define REQ_ALLOCED (1 << __REQ_ALLOCED)
215#define REQ_COPY_USER (1 << __REQ_COPY_USER)
216#define REQ_INTEGRITY (1 << __REQ_INTEGRITY)
217#define REQ_FLUSH (1 << __REQ_FLUSH)
218#define REQ_IO_STAT (1 << __REQ_IO_STAT)
219#define REQ_MIXED_MERGE (1 << __REQ_MIXED_MERGE)
220
221/*
222 * upper 16 bits of bi_rw define the io priority of this bio 47 * upper 16 bits of bi_rw define the io priority of this bio
223 */ 48 */
224#define BIO_PRIO_SHIFT (8 * sizeof(unsigned long) - IOPRIO_BITS) 49#define BIO_PRIO_SHIFT (8 * sizeof(unsigned long) - IOPRIO_BITS)
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-15 00:19:12 -0500