block: use struct parsed_partitions *state universally in partition check code

Make the following changes to partition check code.

* Add ->bdev to struct parsed_partitions.

* Introduce read_part_sector() which is a simple wrapper around
  read_dev_sector() which takes struct parsed_partitions *state
  instead of @bdev.

* For functions which used to take @state and @bdev, drop @bdev.  For
  functions which used to take @bdev, replace it with @state.

* While updating, drop superflous checks on NULL state/bdev in ldm.c.

This cleans up the API a bit and enables better handling of IO errors
during partition check as the generic partition check code now has
much better visibility into what went wrong in the low level code
paths.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Ben Hutchings <ben@decadent.org.uk>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 32 insertions, 36 deletions

diff --git a/fs/partitions/acorn.c b/fs/partitions/acorn.c
index a97b477ac0fc..6921e7890be6 100644
--- a/fs/partitions/acorn.c
+++ b/fs/partitions/acorn.c
@@ -70,14 +70,14 @@ struct riscix_record {
 
 #if defined(CONFIG_ACORN_PARTITION_CUMANA) || \
 	defined(CONFIG_ACORN_PARTITION_ADFS)
-static int
-riscix_partition(struct parsed_partitions *state, struct block_device *bdev,
-		unsigned long first_sect, int slot, unsigned long nr_sects)
+static int riscix_partition(struct parsed_partitions *state,
+			    unsigned long first_sect, int slot,
+			    unsigned long nr_sects)
 {
 	Sector sect;
 	struct riscix_record *rr;
 	
-	rr = (struct riscix_record *)read_dev_sector(bdev, first_sect, &sect);
+	rr = read_part_sector(state, first_sect, &sect);
 	if (!rr)
 		return -1;
 
@@ -123,9 +123,9 @@ struct linux_part {
 
 #if defined(CONFIG_ACORN_PARTITION_CUMANA) || \
 	defined(CONFIG_ACORN_PARTITION_ADFS)
-static int
-linux_partition(struct parsed_partitions *state, struct block_device *bdev,
-		unsigned long first_sect, int slot, unsigned long nr_sects)
+static int linux_partition(struct parsed_partitions *state,
+			   unsigned long first_sect, int slot,
+			   unsigned long nr_sects)
 {
 	Sector sect;
 	struct linux_part *linuxp;
@@ -135,7 +135,7 @@ linux_partition(struct parsed_partitions *state, struct block_device *bdev,
 
 	put_partition(state, slot++, first_sect, size);
 
-	linuxp = (struct linux_part *)read_dev_sector(bdev, first_sect, &sect);
+	linuxp = read_part_sector(state, first_sect, &sect);
 	if (!linuxp)
 		return -1;
 
@@ -157,8 +157,7 @@ linux_partition(struct parsed_partitions *state, struct block_device *bdev,
 #endif
 
 #ifdef CONFIG_ACORN_PARTITION_CUMANA
-int
-adfspart_check_CUMANA(struct parsed_partitions *state, struct block_device *bdev)
+int adfspart_check_CUMANA(struct parsed_partitions *state)
 {
 	unsigned long first_sector = 0;
 	unsigned int start_blk = 0;
@@ -185,7 +184,7 @@ adfspart_check_CUMANA(struct parsed_partitions *state, struct block_device *bdev
 		struct adfs_discrecord *dr;
 		unsigned int nr_sects;
 
-		data = read_dev_sector(bdev, start_blk * 2 + 6, &sect);
+		data = read_part_sector(state, start_blk * 2 + 6, &sect);
 		if (!data)
 			return -1;
 
@@ -217,14 +216,14 @@ adfspart_check_CUMANA(struct parsed_partitions *state, struct block_device *bdev
 #ifdef CONFIG_ACORN_PARTITION_RISCIX
 		case PARTITION_RISCIX_SCSI:
 			/* RISCiX - we don't know how to find the next one. */
-			slot = riscix_partition(state, bdev, first_sector,
-						 slot, nr_sects);
+			slot = riscix_partition(state, first_sector, slot,
+						nr_sects);
 			break;
 #endif
 
 		case PARTITION_LINUX:
-			slot = linux_partition(state, bdev, first_sector,
-						slot, nr_sects);
+			slot = linux_partition(state, first_sector, slot,
+					       nr_sects);
 			break;
 		}
 		put_dev_sector(sect);
@@ -249,8 +248,7 @@ adfspart_check_CUMANA(struct parsed_partitions *state, struct block_device *bdev
  *	    hda1 = ADFS partition on first drive.
  *	    hda2 = non-ADFS partition.
  */
-int
-adfspart_check_ADFS(struct parsed_partitions *state, struct block_device *bdev)
+int adfspart_check_ADFS(struct parsed_partitions *state)
 {
 	unsigned long start_sect, nr_sects, sectscyl, heads;
 	Sector sect;
@@ -259,7 +257,7 @@ adfspart_check_ADFS(struct parsed_partitions *state, struct block_device *bdev)
 	unsigned char id;
 	int slot = 1;
 
-	data = read_dev_sector(bdev, 6, &sect);
+	data = read_part_sector(state, 6, &sect);
 	if (!data)
 		return -1;
 
@@ -278,21 +276,21 @@ adfspart_check_ADFS(struct parsed_partitions *state, struct block_device *bdev)
 	/*
 	 * Work out start of non-adfs partition.
 	 */
-	nr_sects = (bdev->bd_inode->i_size >> 9) - start_sect;
+	nr_sects = (state->bdev->bd_inode->i_size >> 9) - start_sect;
 
 	if (start_sect) {
 		switch (id) {
 #ifdef CONFIG_ACORN_PARTITION_RISCIX
 		case PARTITION_RISCIX_SCSI:
 		case PARTITION_RISCIX_MFM:
-			slot = riscix_partition(state, bdev, start_sect,
-						 slot, nr_sects);
+			slot = riscix_partition(state, start_sect, slot,
+						nr_sects);
 			break;
 #endif
 
 		case PARTITION_LINUX:
-			slot = linux_partition(state, bdev, start_sect,
-						slot, nr_sects);
+			slot = linux_partition(state, start_sect, slot,
+					       nr_sects);
 			break;
 		}
 	}
@@ -308,10 +306,11 @@ struct ics_part {
 	__le32 size;
 };
 
-static int adfspart_check_ICSLinux(struct block_device *bdev, unsigned long block)
+static int adfspart_check_ICSLinux(struct parsed_partitions *state,
+				   unsigned long block)
 {
 	Sector sect;
-	unsigned char *data = read_dev_sector(bdev, block, &sect);
+	unsigned char *data = read_part_sector(state, block, &sect);
 	int result = 0;
 
 	if (data) {
@@ -349,8 +348,7 @@ static inline int valid_ics_sector(const unsigned char *data)
  *	    hda2 = ADFS partition 1 on first drive.
  *		..etc..
  */
-int
-adfspart_check_ICS(struct parsed_partitions *state, struct block_device *bdev)
+int adfspart_check_ICS(struct parsed_partitions *state)
 {
 	const unsigned char *data;
 	const struct ics_part *p;
@@ -360,7 +358,7 @@ adfspart_check_ICS(struct parsed_partitions *state, struct block_device *bdev)
 	/*
 	 * Try ICS style partitions - sector 0 contains partition info.
 	 */
-	data = read_dev_sector(bdev, 0, &sect);
+	data = read_part_sector(state, 0, &sect);
 	if (!data)
 	    	return -1;
 
@@ -392,7 +390,7 @@ adfspart_check_ICS(struct parsed_partitions *state, struct block_device *bdev)
 			 * partition is.  We must not make this visible
 			 * to the filesystem.
 			 */
-			if (size > 1 && adfspart_check_ICSLinux(bdev, start)) {
+			if (size > 1 && adfspart_check_ICSLinux(state, start)) {
 				start += 1;
 				size -= 1;
 			}
@@ -446,8 +444,7 @@ static inline int valid_ptec_sector(const unsigned char *data)
  *	    hda2 = ADFS partition 1 on first drive.
  *		..etc..
  */
-int
-adfspart_check_POWERTEC(struct parsed_partitions *state, struct block_device *bdev)
+int adfspart_check_POWERTEC(struct parsed_partitions *state)
 {
 	Sector sect;
 	const unsigned char *data;
@@ -455,7 +452,7 @@ adfspart_check_POWERTEC(struct parsed_partitions *state, struct block_device *bd
 	int slot = 1;
 	int i;
 
-	data = read_dev_sector(bdev, 0, &sect);
+	data = read_part_sector(state, 0, &sect);
 	if (!data)
 		return -1;
 
@@ -508,8 +505,7 @@ static const char eesox_name[] = {
  *  1. The individual ADFS boot block entries that are placed on the disk.
  *  2. The start address of the next entry.
  */
-int
-adfspart_check_EESOX(struct parsed_partitions *state, struct block_device *bdev)
+int adfspart_check_EESOX(struct parsed_partitions *state)
 {
 	Sector sect;
 	const unsigned char *data;
@@ -518,7 +514,7 @@ adfspart_check_EESOX(struct parsed_partitions *state, struct block_device *bdev)
 	sector_t start = 0;
 	int i, slot = 1;
 
-	data = read_dev_sector(bdev, 7, &sect);
+	data = read_part_sector(state, 7, &sect);
 	if (!data)
 		return -1;
 
@@ -545,7 +541,7 @@ adfspart_check_EESOX(struct parsed_partitions *state, struct block_device *bdev)
 	if (i != 0) {
 		sector_t size;
 
-		size = get_capacity(bdev->bd_disk);
+		size = get_capacity(state->bdev->bd_disk);
 		put_partition(state, slot++, start, size - start);
 		printk("\n");
 	}