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 fdatasync(bio->bi_bdev->bd_fd);
27 bio_for_each_segment(bv, bio, iter)
30 iov = alloca(sizeof(*iov) * i);
33 bio_for_each_segment(bv, bio, iter)
34 iov[i++] = (struct iovec) {
35 .iov_base = page_address(bv.bv_page) + bv.bv_offset,
39 switch (bio_op(bio)) {
41 ret = preadv(bio->bi_bdev->bd_fd, iov, i,
42 bio->bi_iter.bi_sector << 9);
45 ret = pwritev(bio->bi_bdev->bd_fd, iov, i,
46 bio->bi_iter.bi_sector << 9);
52 if (bio->bi_opf & REQ_FUA)
53 fdatasync(bio->bi_bdev->bd_fd);
55 return ret == bio->bi_iter.bi_size ? 0 : -EIO;
58 void generic_make_request(struct bio *bio)
60 bio->bi_error = submit_bio_wait(bio);
64 int blkdev_issue_discard(struct block_device *bdev,
65 sector_t sector, sector_t nr_sects,
66 gfp_t gfp_mask, unsigned long flags)
71 unsigned bdev_logical_block_size(struct block_device *bdev)
77 ret = fstat(bdev->bd_fd, &statbuf);
80 if (!S_ISBLK(statbuf.st_mode))
81 return statbuf.st_blksize >> 9;
83 ret = ioctl(bdev->bd_fd, BLKPBSZGET, &blksize);
89 sector_t get_capacity(struct gendisk *disk)
91 struct block_device *bdev =
92 container_of(disk, struct block_device, __bd_disk);
97 ret = fstat(bdev->bd_fd, &statbuf);
100 if (!S_ISBLK(statbuf.st_mode))
101 return statbuf.st_size >> 9;
103 ret = ioctl(bdev->bd_fd, BLKGETSIZE64, &bytes);
109 void blkdev_put(struct block_device *bdev, fmode_t mode)
111 fdatasync(bdev->bd_fd);
116 struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
119 struct block_device *bdev;
120 int fd, flags = O_DIRECT;
122 if ((mode & (FMODE_READ|FMODE_WRITE)) == (FMODE_READ|FMODE_WRITE))
124 else if (mode & FMODE_READ)
126 else if (mode & FMODE_WRITE)
129 if (mode & FMODE_EXCL)
132 fd = open(path, flags);
134 return ERR_PTR(-errno);
136 bdev = malloc(sizeof(*bdev));
137 memset(bdev, 0, sizeof(*bdev));
139 strncpy(bdev->name, path, sizeof(bdev->name));
140 bdev->name[sizeof(bdev->name) - 1] = '\0';
143 bdev->bd_holder = holder;
144 bdev->bd_disk = &bdev->__bd_disk;
149 void bdput(struct block_device *bdev)
154 struct block_device *lookup_bdev(const char *path)
156 return ERR_PTR(-EINVAL);