Esempio n. 1
0
/**
 * blkdev_reset_zones - Reset zones write pointer
 * @bdev:	Target block device
 * @sector:	Start sector of the first zone to reset
 * @nr_sectors:	Number of sectors, at least the length of one zone
 * @gfp_mask:	Memory allocation flags (for bio_alloc)
 *
 * Description:
 *    Reset the write pointer of the zones contained in the range
 *    @sector..@sector+@nr_sectors. Specifying the entire disk sector range
 *    is valid, but the specified range should not contain conventional zones.
 */
int blkdev_reset_zones(struct block_device *bdev,
		       sector_t sector, sector_t nr_sectors,
		       gfp_t gfp_mask)
{
	struct request_queue *q = bdev_get_queue(bdev);
	sector_t zone_sectors;
	sector_t end_sector = sector + nr_sectors;
	struct bio *bio = NULL;
	struct blk_plug plug;
	int ret;

	if (!blk_queue_is_zoned(q))
		return -EOPNOTSUPP;

	if (bdev_read_only(bdev))
		return -EPERM;

	if (!nr_sectors || end_sector > bdev->bd_part->nr_sects)
		/* Out of range */
		return -EINVAL;

	/* Check alignment (handle eventual smaller last zone) */
	zone_sectors = blk_queue_zone_sectors(q);
	if (sector & (zone_sectors - 1))
		return -EINVAL;

	if ((nr_sectors & (zone_sectors - 1)) &&
	    end_sector != bdev->bd_part->nr_sects)
		return -EINVAL;

	blk_start_plug(&plug);
	while (sector < end_sector) {

		bio = blk_next_bio(bio, 0, gfp_mask);
		bio->bi_iter.bi_sector = sector;
		bio_set_dev(bio, bdev);
		bio_set_op_attrs(bio, REQ_OP_ZONE_RESET, 0);

		sector += zone_sectors;

		/* This may take a while, so be nice to others */
		cond_resched();

	}

	ret = submit_bio_wait(bio);
	bio_put(bio);

	blk_finish_plug(&plug);

	return ret;
}
Esempio n. 2
0
int ext4_encrypted_zeroout(struct inode *inode, struct ext4_extent *ex)
{
	struct ext4_crypto_ctx	*ctx;
	struct page		*ciphertext_page = NULL;
	struct bio		*bio;
	ext4_lblk_t		lblk = ex->ee_block;
	ext4_fsblk_t		pblk = ext4_ext_pblock(ex);
	unsigned int		len = ext4_ext_get_actual_len(ex);
	int			err = 0;

	BUG_ON(inode->i_sb->s_blocksize != PAGE_CACHE_SIZE);

	ctx = ext4_get_crypto_ctx(inode);
	if (IS_ERR(ctx))
		return PTR_ERR(ctx);

	ciphertext_page = alloc_bounce_page(ctx);
	if (IS_ERR(ciphertext_page)) {
		err = PTR_ERR(ciphertext_page);
		goto errout;
	}

	while (len--) {
		err = ext4_page_crypto(ctx, inode, EXT4_ENCRYPT, lblk,
				       ZERO_PAGE(0), ciphertext_page);
		if (err)
			goto errout;

		bio = bio_alloc(GFP_KERNEL, 1);
		if (!bio) {
			err = -ENOMEM;
			goto errout;
		}
		bio->bi_bdev = inode->i_sb->s_bdev;
		bio->bi_sector = pblk;
		err = bio_add_page(bio, ciphertext_page,
				   inode->i_sb->s_blocksize, 0);
		if (err) {
			bio_put(bio);
			goto errout;
		}
		err = submit_bio_wait(WRITE, bio);
		bio_put(bio);
		if (err)
			goto errout;
	}
	err = 0;
errout:
	ext4_release_crypto_ctx(ctx);
	return err;
}
Esempio n. 3
0
/**
 * blkdev_reset_zones - Reset zones write pointer
 * @bdev:	Target block device
 * @sector:	Start sector of the first zone to reset
 * @nr_sectors:	Number of sectors, at least the length of one zone
 * @gfp_mask:	Memory allocation flags (for bio_alloc)
 *
 * Description:
 *    Reset the write pointer of the zones contained in the range
 *    @sector..@sector+@nr_sectors. Specifying the entire disk sector range
 *    is valid, but the specified range should not contain conventional zones.
 */
int blkdev_reset_zones(struct block_device *bdev,
		       sector_t sector, sector_t nr_sectors,
		       gfp_t gfp_mask)
{
	struct request_queue *q = bdev_get_queue(bdev);
	sector_t zone_sectors;
	sector_t end_sector = sector + nr_sectors;
	struct bio *bio;
	int ret;

	if (!q)
		return -ENXIO;

	if (!blk_queue_is_zoned(q))
		return -EOPNOTSUPP;

	if (end_sector > bdev->bd_part->nr_sects)
		/* Out of range */
		return -EINVAL;

	/* Check alignment (handle eventual smaller last zone) */
	zone_sectors = blk_queue_zone_size(q);
	if (sector & (zone_sectors - 1))
		return -EINVAL;

	if ((nr_sectors & (zone_sectors - 1)) &&
	    end_sector != bdev->bd_part->nr_sects)
		return -EINVAL;

	while (sector < end_sector) {

		bio = bio_alloc(gfp_mask, 0);
		bio->bi_iter.bi_sector = sector;
		bio->bi_bdev = bdev;
		bio_set_op_attrs(bio, REQ_OP_ZONE_RESET, 0);

		ret = submit_bio_wait(bio);
		bio_put(bio);

		if (ret)
			return ret;

		sector += zone_sectors;

		/* This may take a while, so be nice to others */
		cond_resched();

	}

	return 0;
}
Esempio n. 4
0
static int sync_request(struct page *page, struct block_device *bdev, int rw)
{
	struct bio bio;
	struct bio_vec bio_vec;

	bio_init(&bio);
	bio.bi_max_vecs = 1;
	bio.bi_io_vec = &bio_vec;
	bio_vec.bv_page = page;
	bio_vec.bv_len = PAGE_SIZE;
	bio_vec.bv_offset = 0;
	bio.bi_vcnt = 1;
	bio.bi_bdev = bdev;
	bio.bi_iter.bi_sector = page->index * (PAGE_SIZE >> 9);
	bio.bi_iter.bi_size = PAGE_SIZE;

	return submit_bio_wait(rw, &bio);
}
Esempio n. 5
0
int ext4_encrypted_zeroout(struct inode *inode, struct ext4_extent *ex)
{
	struct ext4_crypto_ctx	*ctx;
	struct page		*ciphertext_page = NULL;
	struct bio		*bio;
	ext4_lblk_t		lblk = le32_to_cpu(ex->ee_block);
	ext4_fsblk_t		pblk = ext4_ext_pblock(ex);
	unsigned int		len = ext4_ext_get_actual_len(ex);
	int			ret, err = 0;

#if 0
	ext4_msg(inode->i_sb, KERN_CRIT,
		 "ext4_encrypted_zeroout ino %lu lblk %u len %u",
		 (unsigned long) inode->i_ino, lblk, len);
#endif

	BUG_ON(inode->i_sb->s_blocksize != PAGE_CACHE_SIZE);

	ctx = ext4_get_crypto_ctx(inode);
	if (IS_ERR(ctx))
		return PTR_ERR(ctx);

	ciphertext_page = alloc_bounce_page(ctx);
	if (IS_ERR(ciphertext_page)) {
		err = PTR_ERR(ciphertext_page);
		goto errout;
	}

	while (len--) {
		err = ext4_page_crypto(inode, EXT4_ENCRYPT, lblk,
				       ZERO_PAGE(0), ciphertext_page);
		if (err)
			goto errout;

		bio = bio_alloc(GFP_KERNEL, 1);
		if (!bio) {
			err = -ENOMEM;
			goto errout;
		}
		bio->bi_bdev = inode->i_sb->s_bdev;
		bio->bi_iter.bi_sector =
			pblk << (inode->i_sb->s_blocksize_bits - 9);
		ret = bio_add_page(bio, ciphertext_page,
				   inode->i_sb->s_blocksize, 0);
		if (ret != inode->i_sb->s_blocksize) {
			/* should never happen! */
			ext4_msg(inode->i_sb, KERN_ERR,
				 "bio_add_page failed: %d", ret);
			WARN_ON(1);
			bio_put(bio);
			err = -EIO;
			goto errout;
		}
		err = submit_bio_wait(WRITE, bio);
		if ((err == 0) && bio->bi_error)
			err = -EIO;
		bio_put(bio);
		if (err)
			goto errout;
		lblk++; pblk++;
	}
	err = 0;
errout:
	ext4_release_crypto_ctx(ctx);
	return err;
}
Esempio n. 6
0
/**
 * blkdev_report_zones - Get zones information
 * @bdev:	Target block device
 * @sector:	Sector from which to report zones
 * @zones:	Array of zone structures where to return the zones information
 * @nr_zones:	Number of zone structures in the zone array
 * @gfp_mask:	Memory allocation flags (for bio_alloc)
 *
 * Description:
 *    Get zone information starting from the zone containing @sector.
 *    The number of zone information reported may be less than the number
 *    requested by @nr_zones. The number of zones actually reported is
 *    returned in @nr_zones.
 */
int blkdev_report_zones(struct block_device *bdev,
			sector_t sector,
			struct blk_zone *zones,
			unsigned int *nr_zones,
			gfp_t gfp_mask)
{
	struct request_queue *q = bdev_get_queue(bdev);
	struct blk_zone_report_hdr *hdr;
	unsigned int nrz = *nr_zones;
	struct page *page;
	unsigned int nr_rep;
	size_t rep_bytes;
	unsigned int nr_pages;
	struct bio *bio;
	struct bio_vec *bv;
	unsigned int i, n, nz;
	unsigned int ofst;
	void *addr;
	int ret = 0;

	if (!q)
		return -ENXIO;

	if (!blk_queue_is_zoned(q))
		return -EOPNOTSUPP;

	if (!nrz)
		return 0;

	if (sector > bdev->bd_part->nr_sects) {
		*nr_zones = 0;
		return 0;
	}

	/*
	 * The zone report has a header. So make room for it in the
	 * payload. Also make sure that the report fits in a single BIO
	 * that will not be split down the stack.
	 */
	rep_bytes = sizeof(struct blk_zone_report_hdr) +
		sizeof(struct blk_zone) * nrz;
	rep_bytes = (rep_bytes + PAGE_SIZE - 1) & PAGE_MASK;
	if (rep_bytes > (queue_max_sectors(q) << 9))
		rep_bytes = queue_max_sectors(q) << 9;

	nr_pages = min_t(unsigned int, BIO_MAX_PAGES,
			 rep_bytes >> PAGE_SHIFT);
	nr_pages = min_t(unsigned int, nr_pages,
			 queue_max_segments(q));

	bio = bio_alloc(gfp_mask, nr_pages);
	if (!bio)
		return -ENOMEM;

	bio->bi_bdev = bdev;
	bio->bi_iter.bi_sector = blk_zone_start(q, sector);
	bio_set_op_attrs(bio, REQ_OP_ZONE_REPORT, 0);

	for (i = 0; i < nr_pages; i++) {
		page = alloc_page(gfp_mask);
		if (!page) {
			ret = -ENOMEM;
			goto out;
		}
		if (!bio_add_page(bio, page, PAGE_SIZE, 0)) {
			__free_page(page);
			break;
		}
	}

	if (i == 0)
		ret = -ENOMEM;
	else
		ret = submit_bio_wait(bio);
	if (ret)
		goto out;

	/*
	 * Process the report result: skip the header and go through the
	 * reported zones to fixup and fixup the zone information for
	 * partitions. At the same time, return the zone information into
	 * the zone array.
	 */
	n = 0;
	nz = 0;
	nr_rep = 0;
	bio_for_each_segment_all(bv, bio, i) {

		if (!bv->bv_page)
			break;

		addr = kmap_atomic(bv->bv_page);

		/* Get header in the first page */
		ofst = 0;
		if (!nr_rep) {
			hdr = (struct blk_zone_report_hdr *) addr;
			nr_rep = hdr->nr_zones;
			ofst = sizeof(struct blk_zone_report_hdr);
		}

		/* Fixup and report zones */
		while (ofst < bv->bv_len &&
		       n < nr_rep && nz < nrz) {
			if (blkdev_report_zone(bdev, addr + ofst, &zones[nz]))
				nz++;
			ofst += sizeof(struct blk_zone);
			n++;
		}

		kunmap_atomic(addr);

		if (n >= nr_rep || nz >= nrz)
			break;

	}

out:
	bio_for_each_segment_all(bv, bio, i)
		__free_page(bv->bv_page);
	bio_put(bio);

	if (ret == 0)
		*nr_zones = nz;

	return ret;
}