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From: Will Drewry on 4 Aug 2010 14:30
This change extends the partition_meta_info structure to
support EFI GPT-specific metadata and ensures that data
is copied in on partition scanning.

Signed-off-by: Will Drewry <wad(a)chromium.org>

v2: move info assignment after memcpy()s
adds _MAX to the enum after EFI
v3: exports a generic uuid/volname format
---
fs/partitions/efi.c | 25 +++++++++++++++++++++++++
1 files changed, 25 insertions(+), 0 deletions(-)

diff --git a/fs/partitions/efi.c b/fs/partitions/efi.c
index 9efb2cf..427f2fb 100644
--- a/fs/partitions/efi.c
+++ b/fs/partitions/efi.c
@@ -94,6 +94,7 @@
*
************************************************************/
#include <linux/crc32.h>
+#include <linux/ctype.h>
#include <linux/math64.h>
#include <linux/slab.h>
#include "check.h"
@@ -604,6 +605,7 @@ int efi_partition(struct parsed_partitions *state)
gpt_entry *ptes = NULL;
u32 i;
unsigned ssz = bdev_logical_block_size(state->bdev) / 512;
+ u8 unparsed_guid[37];

if (!find_valid_gpt(state, &gpt, &ptes) || !gpt || !ptes) {
kfree(gpt);
@@ -614,6 +616,9 @@ int efi_partition(struct parsed_partitions *state)
pr_debug("GUID Partition Table is valid! Yea!\n");

for (i = 0; i < le32_to_cpu(gpt->num_partition_entries) && i < state->limit-1; i++) {
+ struct partition_meta_info *info;
+ unsigned label_count = 0;
+ unsigned label_max;
u64 start = le64_to_cpu(ptes[i].starting_lba);
u64 size = le64_to_cpu(ptes[i].ending_lba) -
le64_to_cpu(ptes[i].starting_lba) + 1ULL;
@@ -627,6 +632,26 @@ int efi_partition(struct parsed_partitions *state)
if (!efi_guidcmp(ptes[i].partition_type_guid,
PARTITION_LINUX_RAID_GUID))
state->parts[i + 1].flags = ADDPART_FLAG_RAID;
+
+ info = &state->parts[i + 1].info;
+ /* Instead of doing a manual swap to big endian, reuse the
+ * common ASCII hex format as the interim.
+ */
+ efi_guid_unparse(&ptes[i].unique_partition_guid, unparsed_guid);
+ part_pack_uuid(unparsed_guid, info->uuid);
+
+ /* Naively convert UTF16-LE to 7 bits. */
+ label_max = min(sizeof(info->volname) - 1,
+ sizeof(ptes[i].partition_name));
+ info->volname[label_max] = 0;
+ while (label_count < label_max) {
+ u8 c = ptes[i].partition_name[label_count] & 0xff;
+ if (c && !isprint(c))
+ c = '!';
+ info->volname[label_count] = c;
+ label_count++;
+ }
+ state->parts[i + 1].has_info = true;
}
kfree(ptes);
kfree(gpt);
--
1.7.0.4

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Prev: [PATCH 16/20] x86: Introduce x86_msi_ops
Next: [PATCH 04/20] x86/io_apic: add get_nr_irqs_gsi()