11 #include <linux/bio.h>
12 #include <linux/blkdev.h>
15 int submit_bio_wait(struct bio *bio)
18 struct bvec_iter iter;
23 if (bio->bi_opf & REQ_PREFLUSH) {
24 ret = fdatasync(bio->bi_bdev->bd_fd);
26 fprintf(stderr, "fsync error: %m\n");
32 bio_for_each_segment(bv, bio, iter)
35 iov = alloca(sizeof(*iov) * i);
38 bio_for_each_segment(bv, bio, iter)
39 iov[i++] = (struct iovec) {
40 .iov_base = page_address(bv.bv_page) + bv.bv_offset,
44 switch (bio_op(bio)) {
46 ret = preadv(bio->bi_bdev->bd_fd, iov, i,
47 bio->bi_iter.bi_sector << 9);
50 ret = pwritev(bio->bi_bdev->bd_fd, iov, i,
51 bio->bi_iter.bi_sector << 9);
57 if (ret != bio->bi_iter.bi_size) {
58 fprintf(stderr, "IO error: %li (%m)\n", ret);
62 if (bio->bi_opf & REQ_FUA) {
63 ret = fdatasync(bio->bi_bdev->bd_fd);
65 fprintf(stderr, "fsync error: %m\n");
73 void generic_make_request(struct bio *bio)
75 bio->bi_error = submit_bio_wait(bio);
79 int blkdev_issue_discard(struct block_device *bdev,
80 sector_t sector, sector_t nr_sects,
81 gfp_t gfp_mask, unsigned long flags)
86 unsigned bdev_logical_block_size(struct block_device *bdev)
92 ret = fstat(bdev->bd_fd, &statbuf);
95 if (!S_ISBLK(statbuf.st_mode))
96 return statbuf.st_blksize >> 9;
98 ret = ioctl(bdev->bd_fd, BLKPBSZGET, &blksize);
104 sector_t get_capacity(struct gendisk *disk)
106 struct block_device *bdev =
107 container_of(disk, struct block_device, __bd_disk);
112 ret = fstat(bdev->bd_fd, &statbuf);
115 if (!S_ISBLK(statbuf.st_mode))
116 return statbuf.st_size >> 9;
118 ret = ioctl(bdev->bd_fd, BLKGETSIZE64, &bytes);
124 void blkdev_put(struct block_device *bdev, fmode_t mode)
126 fdatasync(bdev->bd_fd);
131 struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
134 struct block_device *bdev;
135 int fd, flags = O_DIRECT;
137 if ((mode & (FMODE_READ|FMODE_WRITE)) == (FMODE_READ|FMODE_WRITE))
139 else if (mode & FMODE_READ)
141 else if (mode & FMODE_WRITE)
144 if (mode & FMODE_EXCL)
147 fd = open(path, flags);
149 return ERR_PTR(-errno);
151 bdev = malloc(sizeof(*bdev));
152 memset(bdev, 0, sizeof(*bdev));
154 strncpy(bdev->name, path, sizeof(bdev->name));
155 bdev->name[sizeof(bdev->name) - 1] = '\0';
158 bdev->bd_holder = holder;
159 bdev->bd_disk = &bdev->__bd_disk;
164 void bdput(struct block_device *bdev)
169 struct block_device *lookup_bdev(const char *path)
171 return ERR_PTR(-EINVAL);