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: %s\n",
33 bio_for_each_segment(bv, bio, iter)
36 iov = alloca(sizeof(*iov) * i);
39 bio_for_each_segment(bv, bio, iter)
40 iov[i++] = (struct iovec) {
41 .iov_base = page_address(bv.bv_page) + bv.bv_offset,
45 switch (bio_op(bio)) {
47 ret = preadv(bio->bi_bdev->bd_fd, iov, i,
48 bio->bi_iter.bi_sector << 9);
51 ret = pwritev(bio->bi_bdev->bd_fd, iov, i,
52 bio->bi_iter.bi_sector << 9);
58 if (ret != bio->bi_iter.bi_size) {
59 fprintf(stderr, "IO error: %li (%s)\n",
60 ret, strerror(errno));
64 if (bio->bi_opf & REQ_FUA) {
65 ret = fdatasync(bio->bi_bdev->bd_fd);
67 fprintf(stderr, "fsync error: %s\n",
76 void generic_make_request(struct bio *bio)
78 bio->bi_error = submit_bio_wait(bio);
82 int blkdev_issue_discard(struct block_device *bdev,
83 sector_t sector, sector_t nr_sects,
84 gfp_t gfp_mask, unsigned long flags)
89 unsigned bdev_logical_block_size(struct block_device *bdev)
95 ret = fstat(bdev->bd_fd, &statbuf);
98 if (!S_ISBLK(statbuf.st_mode))
99 return statbuf.st_blksize >> 9;
101 ret = ioctl(bdev->bd_fd, BLKPBSZGET, &blksize);
107 sector_t get_capacity(struct gendisk *disk)
109 struct block_device *bdev =
110 container_of(disk, struct block_device, __bd_disk);
115 ret = fstat(bdev->bd_fd, &statbuf);
118 if (!S_ISBLK(statbuf.st_mode))
119 return statbuf.st_size >> 9;
121 ret = ioctl(bdev->bd_fd, BLKGETSIZE64, &bytes);
127 void blkdev_put(struct block_device *bdev, fmode_t mode)
129 fdatasync(bdev->bd_fd);
134 struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
137 struct block_device *bdev;
138 int fd, flags = O_DIRECT;
140 if ((mode & (FMODE_READ|FMODE_WRITE)) == (FMODE_READ|FMODE_WRITE))
142 else if (mode & FMODE_READ)
144 else if (mode & FMODE_WRITE)
147 if (mode & FMODE_EXCL)
150 fd = open(path, flags);
152 return ERR_PTR(-errno);
154 bdev = malloc(sizeof(*bdev));
155 memset(bdev, 0, sizeof(*bdev));
157 strncpy(bdev->name, path, sizeof(bdev->name));
158 bdev->name[sizeof(bdev->name) - 1] = '\0';
161 bdev->bd_holder = holder;
162 bdev->bd_disk = &bdev->__bd_disk;
167 void bdput(struct block_device *bdev)
172 struct block_device *lookup_bdev(const char *path)
174 return ERR_PTR(-EINVAL);