-
Notifications
You must be signed in to change notification settings - Fork 10
/
pxd_compat.h
157 lines (137 loc) · 4.41 KB
/
pxd_compat.h
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
#ifndef GDFS_PXD_COMPAT_H
#define GDFS_PXD_COMPAT_H
#include <linux/version.h>
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,17,0)
#include <linux/timekeeping.h>
#else
#include <linux/idr.h>
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,11,0)
#include <linux/sched/signal.h>
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5,7,0)
#include <linux/part_stat.h>
#endif
#include <linux/bio.h>
#include <linux/blk_types.h>
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,14,0)
#define HAVE_BVEC_ITER
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,7,0) || defined(REQ_PREFLUSH)
#define BLK_QUEUE_FLUSH(q) \
blk_queue_write_cache(q, true, true)
#else
#define BLK_QUEUE_FLUSH(q) \
blk_queue_flush(q, REQ_FLUSH | REQ_FUA)
#endif
#ifdef HAVE_BVEC_ITER
#define BIO_SECTOR(bio) bio->bi_iter.bi_sector
#define BIO_SIZE(bio) bio->bi_iter.bi_size
#define BVEC(bvec) (bvec)
#else
#define BIO_SECTOR(bio) bio->bi_sector
#define BIO_SIZE(bio) bio->bi_size
#define BVEC(bvec) (*(bvec))
#endif
#define REQUEST_GET_SECTORS(bio) (BIO_SIZE(bio) >> 9)
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,8,0)
#define BIO_OP(bio) bio_op(bio)
#define SUBMIT_BIO(bio) submit_bio(bio)
#define REQ_OP(rq) req_op(rq)
#else
// only supports read or write
#define BIO_OP(bio) ((bio)->bi_rw)
#define SUBMIT_BIO(bio) submit_bio(((bio)->bi_rw & 1), bio)
#define REQ_OP(rq) (rq)->cmd_flags
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,13,0)
#define BIOSET_CREATE(sz, pad, opt) bioset_create(sz, pad, opt)
#else
#ifndef BIOSET_NEED_BVECS
#define BIOSET_NEED_BVECS (1)
#endif
#define BIOSET_CREATE(sz, pad, opt) bioset_create(sz, pad)
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,14,0) || defined __EL8__
#define BIO_SET_DEV(bio, bdev) bio_set_dev(bio, bdev)
#else
#define BIO_SET_DEV(bio, bdev) do { \
(bio)->bi_bdev = (bdev); \
} while (0)
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,13,0)
#define BIO_ENDIO(bio, err) do { \
(bio)->bi_status = err; \
bio_endio(bio); \
} while (0)
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(4,3,0)
#define BIO_ENDIO(bio, err) do { \
if (err != 0) { \
bio_io_error((bio)); \
} else { \
bio_endio((bio)); \
} \
} while (0)
#else
#define BIO_ENDIO(bio, err) bio_endio((bio), (err))
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,11,0)
#define BLK_RQ_IS_PASSTHROUGH(rq) (blk_rq_is_passthrough(rq))
#else
#define BLK_RQ_IS_PASSTHROUGH(rq) (rq->cmd_type != REQ_TYPE_FS)
#endif
// helper macros for PXD_SETUP_CONGESTION_HOOK
#define __type_is_ptr(bdev) __builtin_types_compatible_p(typeof(bdev), struct backing_dev_info*)
#define __ptr_or_null(bdev) __builtin_choose_expr(__type_is_ptr(bdev), bdev, (struct backing_dev_info*)NULL)
#define __SETUP_CONGESTION_HOOK(bdev, cfn, cdata) \
({ \
if (bdev) { \
(bdev)->congested_fn = cfn;\
(bdev)->congested_data = cdata;\
} \
})
#define PXD_SETUP_CONGESTION_HOOK(bdev, cfn, cdata) \
__builtin_choose_expr(__type_is_ptr(bdev), \
__SETUP_CONGESTION_HOOK(__ptr_or_null(bdev), cfn, cdata), \
__SETUP_CONGESTION_HOOK(__ptr_or_null(&bdev), cfn, cdata))
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,17,0) || \
(LINUX_VERSION_CODE >= KERNEL_VERSION(4,12,0) && \
defined(bvec_iter_sectors))
#define QUEUE_FLAG_SET(flag,q) blk_queue_flag_set(flag, q);
#else
#define QUEUE_FLAG_SET(flag,q) queue_flag_set_unlocked(flag, q);
#endif
static inline unsigned int get_op_flags(struct bio *bio)
{
unsigned int op_flags;
if (!bio) return 0;
#if LINUX_VERSION_CODE < KERNEL_VERSION(4,8,0)
op_flags = 0; // Not present in older kernels
#elif LINUX_VERSION_CODE < KERNEL_VERSION(4,9,0)
op_flags = (bio->bi_opf & ((1 << BIO_OP_SHIFT) - 1));
#elif LINUX_VERSION_CODE < KERNEL_VERSION(4,10,0)
op_flags = bio_flags(bio);
#else
op_flags = (bio->bi_opf & ~REQ_OP_MASK);
#endif
return op_flags;
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,14,0)
#define BDEVNAME(bio, b) bio_devname(bio, b)
#define BIO_COPY_DEV(dst, src) bio_copy_dev(dst, src)
#else
#define BDEVNAME(bio, b) bdevname(bio->bi_bdev, b)
#define BIO_COPY_DEV(dst, src) do { \
(dst)->bi_bdev = (src)->bi_bdev; \
} while (0)
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,8,0)
#define BIO_SET_OP_ATTRS(b, op, flags) bio_set_op_attrs(b, op, flags)
#else
// no 'op_flags' present, hence ignored, but pet the compiler for unused var
#define BIO_SET_OP_ATTRS(b, op, flags) do { \
(void)(flags); \
(b)->bi_rw = op; \
} while (0)
#endif
#endif //GDFS_PXD_COMPAT_H