C++ (Cpp) sfs_bmap_get_sub_nolockの例

コード例 #1

ファイル: sfs_inode.c プロジェクト: geraint0923/ucore_plus

static int
sfs_bmap_get_nolock(struct sfs_fs *sfs, struct sfs_inode *sin, uint32_t index, bool create, uint32_t *ino_store) {
    struct sfs_disk_inode *din = sin->din;
    int ret;
    uint32_t ent, ino;
    if (index < SFS_NDIRECT) {
        if ((ino = din->direct[index]) == 0 && create) {
            if ((ret = sfs_block_alloc(sfs, &ino)) != 0) {
                return ret;
            }
            din->direct[index] = ino;
            sin->dirty = 1;
        }
        goto out;
    }

    index -= SFS_NDIRECT;
    if (index < SFS_BLK_NENTRY) {
        ent = din->indirect;
        if ((ret = sfs_bmap_get_sub_nolock(sfs, &ent, index, create, &ino)) != 0) {
            return ret;
        }
        if (ent != din->indirect) {
            assert(din->indirect == 0);
            din->indirect = ent;
            sin->dirty = 1;
        }
        goto out;
    }

    index -= SFS_BLK_NENTRY;
    ent = din->db_indirect;
    if ((ret = sfs_bmap_get_sub_nolock(sfs, &ent, index / SFS_BLK_NENTRY, create, &ino)) != 0) {
        return ret;
    }
    if (ent != din->db_indirect) {
        assert(din->db_indirect == 0);
        din->db_indirect = ent;
        sin->dirty = 1;
    }
    if ((ent = ino) != 0) {
        if ((ret = sfs_bmap_get_sub_nolock(sfs, &ent, index % SFS_BLK_NENTRY, create, &ino)) != 0) {
            return ret;
        }
    }

out:
    assert(ino == 0 || sfs_block_inuse(sfs, ino));
    *ino_store = ino;
    return 0;
}

コード例 #2

ファイル: sfs_inode.c プロジェクト: Aureate-Sunshine/ucore

/*
 * sfs_bmap_get_nolock - according sfs_inode and index of block, find the NO. of disk block
 *                       no lock protect
 * @sfs:      sfs file system
 * @sin:      sfs inode in memory
 * @index:    the index of block in inode
 * @create:   BOOL, if the block isn't allocated, if create = 1 the alloc a block,  otherwise just do nothing
 * @ino_store: 0 OR the index of already inused block or new allocated block.
 */
static int
sfs_bmap_get_nolock(struct sfs_fs *sfs, struct sfs_inode *sin, uint32_t index, bool create, uint32_t *ino_store) {
    struct sfs_disk_inode *din = sin->din;
    int ret;
    uint32_t ent, ino;
	// the index of disk block is in the fist SFS_NDIRECT  direct blocks
    if (index < SFS_NDIRECT) {
        if ((ino = din->direct[index]) == 0 && create) {
            if ((ret = sfs_block_alloc(sfs, &ino)) != 0) {
                return ret;
            }
            din->direct[index] = ino;
            sin->dirty = 1;
        }
        goto out;
    }
    // the index of disk block is in the indirect blocks.
    index -= SFS_NDIRECT;
    if (index < SFS_BLK_NENTRY) {
        ent = din->indirect;
        if ((ret = sfs_bmap_get_sub_nolock(sfs, &ent, index, create, &ino)) != 0) {
            return ret;
        }
        if (ent != din->indirect) {
            assert(din->indirect == 0);
            din->indirect = ent;
            sin->dirty = 1;
        }
        goto out;
    } else {
		panic ("sfs_bmap_get_nolock - index out of range");
	}
out:
    assert(ino == 0 || sfs_block_inuse(sfs, ino));
    *ino_store = ino;
    return 0;
}

コード例 #3

ファイル: sfs_inode.c プロジェクト: geraint0923/ucore_plus

static int
sfs_bmap_free_nolock(struct sfs_fs *sfs, struct sfs_inode *sin, uint32_t index) {
    struct sfs_disk_inode *din = sin->din;
    int ret;
    uint32_t ent, ino;
    if (index < SFS_NDIRECT) {
        if ((ino = din->direct[index]) != 0) {
            sfs_block_free(sfs, ino);
            din->direct[index] = 0;
            sin->dirty = 1;
        }
        return 0;
    }

    index -= SFS_NDIRECT;
    if (index < SFS_BLK_NENTRY) {
        if ((ent = din->indirect) != 0) {
            if ((ret = sfs_bmap_free_sub_nolock(sfs, ent, index)) != 0) {
                return ret;
            }
        }
        return 0;
    }

    index -= SFS_BLK_NENTRY;
    if ((ent = din->db_indirect) != 0) {
        if ((ret = sfs_bmap_get_sub_nolock(sfs, &ent, index / SFS_BLK_NENTRY, 0, &ino)) != 0) {
            return ret;
        }
        if ((ent = ino) != 0) {
            if ((ret = sfs_bmap_free_sub_nolock(sfs, ent, index % SFS_BLK_NENTRY)) != 0) {
                return ret;
            }
        }
    }
    return 0;
}