block/partitions/osf.c

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

File Facts

System
Linux kernel
Corpus path
block/partitions/osf.c
Extension
.c
Size
1977 bytes
Lines
88
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 {
		__le32 d_magic;
		__le16 d_type,d_subtype;
		u8 d_typename[16];
		u8 d_packname[16];
		__le32 d_secsize;
		__le32 d_nsectors;
		__le32 d_ntracks;
		__le32 d_ncylinders;
		__le32 d_secpercyl;
		__le32 d_secprtunit;
		__le16 d_sparespertrack;
		__le16 d_sparespercyl;
		__le32 d_acylinders;
		__le16 d_rpm, d_interleave, d_trackskew, d_cylskew;
		__le32 d_headswitch, d_trkseek, d_flags;
		__le32 d_drivedata[5];
		__le32 d_spare[5];
		__le32 d_magic2;
		__le16 d_checksum;
		__le16 d_npartitions;
		__le32 d_bbsize, d_sbsize;
		struct d_partition {
			__le32 p_size;
			__le32 p_offset;
			__le32 p_fsize;
			u8  p_fstype;
			u8  p_frag;
			__le16 p_cpg;
		} d_partitions[MAX_OSF_PARTITIONS];
	} * label;
	struct d_partition * partition;

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

	label = (struct disklabel *) (data+64);
	partition = label->d_partitions;
	if (le32_to_cpu(label->d_magic) != DISKLABELMAGIC) {
		put_dev_sector(sect);
		return 0;
	}
	if (le32_to_cpu(label->d_magic2) != DISKLABELMAGIC) {
		put_dev_sector(sect);
		return 0;
	}
	npartitions = le16_to_cpu(label->d_npartitions);
	if (npartitions > MAX_OSF_PARTITIONS) {
		put_dev_sector(sect);
		return 0;
	}
	for (i = 0 ; i < npartitions; i++, partition++) {
		if (slot == state->limit)
		        break;
		if (le32_to_cpu(partition->p_size))
			put_partition(state, slot,
				le32_to_cpu(partition->p_offset),
				le32_to_cpu(partition->p_size));
		slot++;
	}
	seq_buf_puts(&state->pp_buf, "\n");
	put_dev_sector(sect);
	return 1;
}

Annotation

Implementation Notes