block/partitions/karma.c

Source file repositories/reference/linux-study-clean/block/partitions/karma.c

File Facts

System
Linux kernel
Corpus path
block/partitions/karma.c
Extension
.c
Size
1162 bytes
Lines
61
Domain
Representative Device Path
Bucket
PCIe NVMe Storage Path
Inferred role
Representative Device Path: implementation source
Status
source implementation candidate

Why This File Exists

Part of the selected hardware vertical slice: PCI discovery, driver binding, NVMe queues, block requests, DMA, interrupts, and completion.

Dependency Surface

Detected Declarations

Annotated Snippet

struct disklabel {
		u8 d_reserved[270];
		struct d_partition {
			__le32 p_res;
			u8 p_fstype;
			u8 p_res2[3];
			__le32 p_offset;
			__le32 p_size;
		} d_partitions[2];
		u8 d_blank[208];
		__le16 d_magic;
	} __packed *label;
	struct d_partition *p;

	data = read_part_sector(state, 0, &sect);
	if (!data)
		return -1;

	label = (struct disklabel *)data;
	if (le16_to_cpu(label->d_magic) != KARMA_LABEL_MAGIC) {
		put_dev_sector(sect);
		return 0;
	}

	p = label->d_partitions;
	for (i = 0 ; i < 2; i++, p++) {
		if (slot == state->limit)
			break;

		if (p->p_fstype == 0x4d && le32_to_cpu(p->p_size)) {
			put_partition(state, slot, le32_to_cpu(p->p_offset),
				le32_to_cpu(p->p_size));
		}
		slot++;
	}
	seq_buf_puts(&state->pp_buf, "\n");
	put_dev_sector(sect);
	return 1;
}

Annotation

Implementation Notes