aboutsummaryrefslogtreecommitdiff
path: root/fs/partitions/efi.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/partitions/efi.c')
-rw-r--r--fs/partitions/efi.c91
1 files changed, 43 insertions, 48 deletions
diff --git a/fs/partitions/efi.c b/fs/partitions/efi.c
index 91babdae758..9e346c19bbb 100644
--- a/fs/partitions/efi.c
+++ b/fs/partitions/efi.c
@@ -140,8 +140,7 @@ efi_crc32(const void *buf, unsigned long len)
* the part[0] entry for this disk, and is the number of
* physical sectors available on the disk.
*/
-static u64
-last_lba(struct block_device *bdev)
+static u64 last_lba(struct block_device *bdev)
{
if (!bdev || !bdev->bd_inode)
return 0;
@@ -181,27 +180,28 @@ is_pmbr_valid(legacy_mbr *mbr)
/**
* read_lba(): Read bytes from disk, starting at given LBA
- * @bdev
+ * @state
* @lba
* @buffer
* @size_t
*
- * Description: Reads @count bytes from @bdev into @buffer.
+ * Description: Reads @count bytes from @state->bdev into @buffer.
* Returns number of bytes read on success, 0 on error.
*/
-static size_t
-read_lba(struct block_device *bdev, u64 lba, u8 * buffer, size_t count)
+static size_t read_lba(struct parsed_partitions *state,
+ u64 lba, u8 *buffer, size_t count)
{
size_t totalreadcount = 0;
+ struct block_device *bdev = state->bdev;
sector_t n = lba * (bdev_logical_block_size(bdev) / 512);
- if (!bdev || !buffer || lba > last_lba(bdev))
+ if (!buffer || lba > last_lba(bdev))
return 0;
while (count) {
int copied = 512;
Sector sect;
- unsigned char *data = read_dev_sector(bdev, n++, &sect);
+ unsigned char *data = read_part_sector(state, n++, &sect);
if (!data)
break;
if (copied > count)
@@ -217,19 +217,20 @@ read_lba(struct block_device *bdev, u64 lba, u8 * buffer, size_t count)
/**
* alloc_read_gpt_entries(): reads partition entries from disk
- * @bdev
+ * @state
* @gpt - GPT header
*
* Description: Returns ptes on success, NULL on error.
* Allocates space for PTEs based on information found in @gpt.
* Notes: remember to free pte when you're done!
*/
-static gpt_entry *
-alloc_read_gpt_entries(struct block_device *bdev, gpt_header *gpt)
+static gpt_entry *alloc_read_gpt_entries(struct parsed_partitions *state,
+ gpt_header *gpt)
{
size_t count;
gpt_entry *pte;
- if (!bdev || !gpt)
+
+ if (!gpt)
return NULL;
count = le32_to_cpu(gpt->num_partition_entries) *
@@ -240,7 +241,7 @@ alloc_read_gpt_entries(struct block_device *bdev, gpt_header *gpt)
if (!pte)
return NULL;
- if (read_lba(bdev, le64_to_cpu(gpt->partition_entry_lba),
+ if (read_lba(state, le64_to_cpu(gpt->partition_entry_lba),
(u8 *) pte,
count) < count) {
kfree(pte);
@@ -252,27 +253,24 @@ alloc_read_gpt_entries(struct block_device *bdev, gpt_header *gpt)
/**
* alloc_read_gpt_header(): Allocates GPT header, reads into it from disk
- * @bdev
+ * @state
* @lba is the Logical Block Address of the partition table
*
* Description: returns GPT header on success, NULL on error. Allocates
- * and fills a GPT header starting at @ from @bdev.
+ * and fills a GPT header starting at @ from @state->bdev.
* Note: remember to free gpt when finished with it.
*/
-static gpt_header *
-alloc_read_gpt_header(struct block_device *bdev, u64 lba)
+static gpt_header *alloc_read_gpt_header(struct parsed_partitions *state,
+ u64 lba)
{
gpt_header *gpt;
- unsigned ssz = bdev_logical_block_size(bdev);
-
- if (!bdev)
- return NULL;
+ unsigned ssz = bdev_logical_block_size(state->bdev);
gpt = kzalloc(ssz, GFP_KERNEL);
if (!gpt)
return NULL;
- if (read_lba(bdev, lba, (u8 *) gpt, ssz) < ssz) {
+ if (read_lba(state, lba, (u8 *) gpt, ssz) < ssz) {
kfree(gpt);
gpt=NULL;
return NULL;
@@ -283,7 +281,7 @@ alloc_read_gpt_header(struct block_device *bdev, u64 lba)
/**
* is_gpt_valid() - tests one GPT header and PTEs for validity
- * @bdev
+ * @state
* @lba is the logical block address of the GPT header to test
* @gpt is a GPT header ptr, filled on return.
* @ptes is a PTEs ptr, filled on return.
@@ -291,16 +289,15 @@ alloc_read_gpt_header(struct block_device *bdev, u64 lba)
* Description: returns 1 if valid, 0 on error.
* If valid, returns pointers to newly allocated GPT header and PTEs.
*/
-static int
-is_gpt_valid(struct block_device *bdev, u64 lba,
- gpt_header **gpt, gpt_entry **ptes)
+static int is_gpt_valid(struct parsed_partitions *state, u64 lba,
+ gpt_header **gpt, gpt_entry **ptes)
{
u32 crc, origcrc;
u64 lastlba;
- if (!bdev || !gpt || !ptes)
+ if (!ptes)
return 0;
- if (!(*gpt = alloc_read_gpt_header(bdev, lba)))
+ if (!(*gpt = alloc_read_gpt_header(state, lba)))
return 0;
/* Check the GUID Partition Table signature */
@@ -336,7 +333,7 @@ is_gpt_valid(struct block_device *bdev, u64 lba,
/* Check the first_usable_lba and last_usable_lba are
* within the disk.
*/
- lastlba = last_lba(bdev);
+ lastlba = last_lba(state->bdev);
if (le64_to_cpu((*gpt)->first_usable_lba) > lastlba) {
pr_debug("GPT: first_usable_lba incorrect: %lld > %lld\n",
(unsigned long long)le64_to_cpu((*gpt)->first_usable_lba),
@@ -350,7 +347,7 @@ is_gpt_valid(struct block_device *bdev, u64 lba,
goto fail;
}
- if (!(*ptes = alloc_read_gpt_entries(bdev, *gpt)))
+ if (!(*ptes = alloc_read_gpt_entries(state, *gpt)))
goto fail;
/* Check the GUID Partition Entry Array CRC */
@@ -495,7 +492,7 @@ compare_gpts(gpt_header *pgpt, gpt_header *agpt, u64 lastlba)
/**
* find_valid_gpt() - Search disk for valid GPT headers and PTEs
- * @bdev
+ * @state
* @gpt is a GPT header ptr, filled on return.
* @ptes is a PTEs ptr, filled on return.
* Description: Returns 1 if valid, 0 on error.
@@ -508,24 +505,25 @@ compare_gpts(gpt_header *pgpt, gpt_header *agpt, u64 lastlba)
* This protects against devices which misreport their size, and forces
* the user to decide to use the Alternate GPT.
*/
-static int
-find_valid_gpt(struct block_device *bdev, gpt_header **gpt, gpt_entry **ptes)
+static int find_valid_gpt(struct parsed_partitions *state, gpt_header **gpt,
+ gpt_entry **ptes)
{
int good_pgpt = 0, good_agpt = 0, good_pmbr = 0;
gpt_header *pgpt = NULL, *agpt = NULL;
gpt_entry *pptes = NULL, *aptes = NULL;
legacy_mbr *legacymbr;
u64 lastlba;
- if (!bdev || !gpt || !ptes)
+
+ if (!ptes)
return 0;
- lastlba = last_lba(bdev);
+ lastlba = last_lba(state->bdev);
if (!force_gpt) {
/* This will be added to the EFI Spec. per Intel after v1.02. */
legacymbr = kzalloc(sizeof (*legacymbr), GFP_KERNEL);
if (legacymbr) {
- read_lba(bdev, 0, (u8 *) legacymbr,
- sizeof (*legacymbr));
+ read_lba(state, 0, (u8 *) legacymbr,
+ sizeof (*legacymbr));
good_pmbr = is_pmbr_valid(legacymbr);
kfree(legacymbr);
}
@@ -533,15 +531,14 @@ find_valid_gpt(struct block_device *bdev, gpt_header **gpt, gpt_entry **ptes)
goto fail;
}
- good_pgpt = is_gpt_valid(bdev, GPT_PRIMARY_PARTITION_TABLE_LBA,
+ good_pgpt = is_gpt_valid(state, GPT_PRIMARY_PARTITION_TABLE_LBA,
&pgpt, &pptes);
if (good_pgpt)
- good_agpt = is_gpt_valid(bdev,
+ good_agpt = is_gpt_valid(state,
le64_to_cpu(pgpt->alternate_lba),
&agpt, &aptes);
if (!good_agpt && force_gpt)
- good_agpt = is_gpt_valid(bdev, lastlba,
- &agpt, &aptes);
+ good_agpt = is_gpt_valid(state, lastlba, &agpt, &aptes);
/* The obviously unsuccessful case */
if (!good_pgpt && !good_agpt)
@@ -583,9 +580,8 @@ find_valid_gpt(struct block_device *bdev, gpt_header **gpt, gpt_entry **ptes)
}
/**
- * efi_partition(struct parsed_partitions *state, struct block_device *bdev)
+ * efi_partition(struct parsed_partitions *state)
* @state
- * @bdev
*
* Description: called from check.c, if the disk contains GPT
* partitions, sets up partition entries in the kernel.
@@ -602,15 +598,14 @@ find_valid_gpt(struct block_device *bdev, gpt_header **gpt, gpt_entry **ptes)
* 1 if successful
*
*/
-int
-efi_partition(struct parsed_partitions *state, struct block_device *bdev)
+int efi_partition(struct parsed_partitions *state)
{
gpt_header *gpt = NULL;
gpt_entry *ptes = NULL;
u32 i;
- unsigned ssz = bdev_logical_block_size(bdev) / 512;
+ unsigned ssz = bdev_logical_block_size(state->bdev) / 512;
- if (!find_valid_gpt(bdev, &gpt, &ptes) || !gpt || !ptes) {
+ if (!find_valid_gpt(state, &gpt, &ptes) || !gpt || !ptes) {
kfree(gpt);
kfree(ptes);
return 0;
@@ -623,7 +618,7 @@ efi_partition(struct parsed_partitions *state, struct block_device *bdev)
u64 size = le64_to_cpu(ptes[i].ending_lba) -
le64_to_cpu(ptes[i].starting_lba) + 1ULL;
- if (!is_pte_valid(&ptes[i], last_lba(bdev)))
+ if (!is_pte_valid(&ptes[i], last_lba(state->bdev)))
continue;
put_partition(state, i+1, start * ssz, size * ssz);
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-24 03:24:21 +0000