C++ (Cpp) nandfs_bmap_lookup Examples

Example #1

File: nandfs_dat.c Project: hmatyschok/MeshBSD

int
nandfs_get_dat_bdescs(struct nandfs_device *nffsdev, struct nandfs_bdesc *bd,
    uint32_t nmembs)
{
	struct nandfs_node *dat_node;
	uint64_t map;
	uint32_t i;
	int error = 0;

	dat_node = nffsdev->nd_dat_node;

	VOP_LOCK(NTOV(dat_node), LK_EXCLUSIVE);

	for (i = 0; i < nmembs; i++) {
		DPRINTF(CLEAN,
		    ("%s: bd ino:%#jx oblk:%#jx blocknr:%#jx off:%#jx\n",
		    __func__,  (uintmax_t)bd[i].bd_ino,
		    (uintmax_t)bd[i].bd_oblocknr, (uintmax_t)bd[i].bd_blocknr,
		    (uintmax_t)bd[i].bd_offset));

		error = nandfs_bmap_lookup(dat_node, bd[i].bd_offset, &map);
		if (error)
			break;
		bd[i].bd_blocknr = map;
	}

	VOP_UNLOCK(NTOV(dat_node), 0);
	return (error);
}

Example #2

File: nandfs_sufile.c Project: coyizumi/cs111

/* Alloc new segment */
int
nandfs_alloc_segment(struct nandfs_device *fsdev, uint64_t *seg)
{
	struct nandfs_node *su_node;
	struct nandfs_sufile_header *su_header;
	struct nandfs_segment_usage *su_usage;
	struct buf *bp_header, *bp;
	uint64_t blk, vblk, offset, i, rest, nsegments;
	uint16_t seg_size;
	int error, found;

	seg_size = fsdev->nd_fsdata.f_segment_usage_size;
	nsegments = fsdev->nd_fsdata.f_nsegments;

	su_node = fsdev->nd_su_node;
	ASSERT_VOP_LOCKED(NTOV(su_node), __func__);

	/* Read header buffer */
	error = nandfs_bread(su_node, 0, NOCRED, 0, &bp_header);
	if (error) {
		brelse(bp_header);
		return (error);
	}

	su_header = (struct nandfs_sufile_header *)bp_header->b_data;

	/* Get last allocated segment */
	i = su_header->sh_last_alloc + 1;

	found = 0;
	bp = NULL;
	while (!found) {
		nandfs_seg_usage_blk_offset(fsdev, i, &blk, &offset);
		if(blk != 0) {
			error = nandfs_bmap_lookup(su_node, blk, &vblk);
			if (error) {
				nandfs_error("%s: cannot find vblk for blk "
				    "blk:%jx\n", __func__, blk);
				return (error);
			}
			if (vblk)
				error = nandfs_bread(su_node, blk, NOCRED, 0,
				    &bp);
			else
				error = nandfs_bcreate(su_node, blk, NOCRED, 0,
				    &bp);
			if (error) {
				nandfs_error("%s: cannot create/read "
				    "vblk:%jx\n", __func__, vblk);
				if (bp)
					brelse(bp);
				return (error);
			}

			su_usage = SU_USAGE_OFF(bp, offset);
		} else {
			su_usage = SU_USAGE_OFF(bp_header, offset);
			bp = bp_header;
		}

		rest = (fsdev->nd_blocksize - offset) / seg_size;
		/* Go through all su usage in block */
		while (rest) {
			/* When last check start from beggining */
			if (i == nsegments)
				break;

			if (!su_usage->su_flags) {
				su_usage->su_flags = 1;
				found = 1;
				break;
			}
			su_usage++;
			i++;

			/* If all checked return error */
			if (i == su_header->sh_last_alloc) {
				DPRINTF(SEG, ("%s: cannot allocate segment \n",
				    __func__));
				brelse(bp_header);
				if (blk != 0)
					brelse(bp);
				return (1);
			}
			rest--;
		}
		if (!found) {
			/* Otherwise read another block */
			if (blk != 0)
				brelse(bp);
			if (i == nsegments) {
				blk = 0;
				i = 0;
			} else
				blk++;
			offset = 0;
		}
	}

	if (found) {
		*seg = i;
		su_header->sh_last_alloc = i;
		su_header->sh_ncleansegs--;
		su_header->sh_ndirtysegs++;

		fsdev->nd_super.s_free_blocks_count = su_header->sh_ncleansegs *
		    fsdev->nd_fsdata.f_blocks_per_segment;
		fsdev->nd_clean_segs--;

		/*
		 * It is mostly called from syncer() so we want to force
		 * making buf dirty.
		 */
		error = nandfs_dirty_buf(bp_header, 1);
		if (error) {
			if (bp && bp != bp_header)
				brelse(bp);
			return (error);
		}
		if (bp && bp != bp_header)
			nandfs_dirty_buf(bp, 1);

		DPRINTF(SEG, ("%s: seg:%#jx\n", __func__, (uintmax_t)i));

		return (0);
	}

	DPRINTF(SEG, ("%s: failed\n", __func__));

	return (1);
}