13 #include <linux/bio.h>
14 #include <linux/blkdev.h>
15 #include <linux/completion.h>
17 #include <linux/kthread.h>
19 #include "tools-util.h"
21 static io_context_t aio_ctx;
23 void generic_make_request(struct bio *bio)
26 struct bvec_iter iter;
31 if (bio->bi_opf & REQ_PREFLUSH) {
32 ret = fdatasync(bio->bi_bdev->bd_fd);
34 fprintf(stderr, "fsync error: %m\n");
42 bio_for_each_segment(bv, bio, iter)
45 iov = alloca(sizeof(*iov) * i);
48 bio_for_each_segment(bv, bio, iter)
49 iov[i++] = (struct iovec) {
50 .iov_base = page_address(bv.bv_page) + bv.bv_offset,
56 .aio_fildes = bio->bi_opf & REQ_FUA
57 ? bio->bi_bdev->bd_sync_fd
58 : bio->bi_bdev->bd_fd,
61 switch (bio_op(bio)) {
63 iocb.aio_lio_opcode = IO_CMD_PREADV;
66 iocb.u.v.offset = bio->bi_iter.bi_sector << 9;
68 ret = io_submit(aio_ctx, 1, &iocbp);
70 die("io_submit err: %s", strerror(-ret));
73 iocb.aio_lio_opcode = IO_CMD_PWRITEV;
76 iocb.u.v.offset = bio->bi_iter.bi_sector << 9;
78 ret = io_submit(aio_ctx, 1, &iocbp);
80 die("io_submit err: %s", strerror(-ret));
87 static void submit_bio_wait_endio(struct bio *bio)
89 complete(bio->bi_private);
92 int submit_bio_wait(struct bio *bio)
94 struct completion done;
96 init_completion(&done);
97 bio->bi_private = &done;
98 bio->bi_end_io = submit_bio_wait_endio;
99 bio->bi_opf |= REQ_SYNC;
101 wait_for_completion(&done);
103 return bio->bi_error;
106 int blkdev_issue_discard(struct block_device *bdev,
107 sector_t sector, sector_t nr_sects,
108 gfp_t gfp_mask, unsigned long flags)
113 unsigned bdev_logical_block_size(struct block_device *bdev)
119 ret = fstat(bdev->bd_fd, &statbuf);
122 if (!S_ISBLK(statbuf.st_mode))
123 return statbuf.st_blksize >> 9;
125 ret = ioctl(bdev->bd_fd, BLKPBSZGET, &blksize);
131 sector_t get_capacity(struct gendisk *disk)
133 struct block_device *bdev =
134 container_of(disk, struct block_device, __bd_disk);
139 ret = fstat(bdev->bd_fd, &statbuf);
142 if (!S_ISBLK(statbuf.st_mode))
143 return statbuf.st_size >> 9;
145 ret = ioctl(bdev->bd_fd, BLKGETSIZE64, &bytes);
151 void blkdev_put(struct block_device *bdev, fmode_t mode)
153 fdatasync(bdev->bd_fd);
154 close(bdev->bd_sync_fd);
159 struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
162 struct block_device *bdev;
163 int fd, sync_fd, flags = O_DIRECT;
165 if ((mode & (FMODE_READ|FMODE_WRITE)) == (FMODE_READ|FMODE_WRITE))
167 else if (mode & FMODE_READ)
169 else if (mode & FMODE_WRITE)
173 /* using O_EXCL doesn't work with opening twice for an O_SYNC fd: */
174 if (mode & FMODE_EXCL)
178 fd = open(path, flags);
180 return ERR_PTR(-errno);
182 sync_fd = open(path, flags|O_SYNC);
186 return ERR_PTR(-errno);
189 bdev = malloc(sizeof(*bdev));
190 memset(bdev, 0, sizeof(*bdev));
192 strncpy(bdev->name, path, sizeof(bdev->name));
193 bdev->name[sizeof(bdev->name) - 1] = '\0';
196 bdev->bd_sync_fd = sync_fd;
197 bdev->bd_holder = holder;
198 bdev->bd_disk = &bdev->__bd_disk;
199 bdev->bd_bdi = &bdev->__bd_bdi;
200 bdev->queue.backing_dev_info = bdev->bd_bdi;
205 void bdput(struct block_device *bdev)
210 struct block_device *lookup_bdev(const char *path)
212 return ERR_PTR(-EINVAL);
215 static int aio_completion_thread(void *arg)
217 struct io_event events[8], *ev;
221 ret = io_getevents(aio_ctx, 1, ARRAY_SIZE(events),
224 if (ret < 0 && ret == -EINTR)
227 die("io_getevents() error: %s", strerror(-ret));
229 for (ev = events; ev < events + ret; ev++) {
230 struct bio *bio = (struct bio *) ev->data;
233 bio->bi_error = ev->res;
234 else if (ev->res != bio->bi_iter.bi_size)
235 bio->bi_error = -EIO;
244 __attribute__((constructor(102)))
245 static void blkdev_init(void)
247 struct task_struct *p;
249 if (io_setup(256, &aio_ctx))
250 die("io_setup() error: %m");
252 p = kthread_run(aio_completion_thread, NULL, "aio_completion");