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authorUlf Hansson <ulf.hansson@stericsson.com>2010-05-12 11:55:51 +0200
committerUlf Hansson <ulf.hansson@stericsson.com>2011-09-19 15:14:32 +0200
commitedb1d431af49b1879845d713bbead4534ff9a956 (patch)
tree820f98fa08d84f14fae5e64733e0c771f724e4fa /fs
parent499dc60eff64ecdfe578883d582d2ad864affa5c (diff)
Added commandline partitions for block devices
Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/305 Reviewed-by: Jonas ABERG <jonas.aberg@stericsson.com> Reviewed-by: Linus WALLEIJ <linus.walleij@stericsson.com> Tested-by: Linus WALLEIJ <linus.walleij@stericsson.com> Signed-off-by: Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com> Change-Id: I3725676a9177b0072a435865ae578a6e17bd7168 Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/2206
Diffstat (limited to 'fs')
-rw-r--r--fs/partitions/Kconfig19
-rw-r--r--fs/partitions/Makefile1
-rwxr-xr-xfs/partitions/blkdev_parts.c127
-rwxr-xr-xfs/partitions/blkdev_parts.h14
-rw-r--r--fs/partitions/check.c4
5 files changed, 165 insertions, 0 deletions
diff --git a/fs/partitions/Kconfig b/fs/partitions/Kconfig
index cb5f0a3f1b0..097be1934ee 100644
--- a/fs/partitions/Kconfig
+++ b/fs/partitions/Kconfig
@@ -68,6 +68,25 @@ config ACORN_PARTITION_RISCIX
of machines called RISCiX. If you say 'Y' here, Linux will be able
to read disks partitioned under RISCiX.
+config BLKDEV_PARTITION
+ bool "Blockdev commandline partition support" if PARTITION_ADVANCED
+ default n
+ help
+ Say Y if you like to setup partitions for block devices by reading
+ from the kernel command line (kernel boot arguments).
+
+ The format of the partitions on the command line:
+ blkdevparts=<blkdev-def>[;<blkdev-def>]
+ <blkdev-def> := <blkdev-id>:<partdef>[,<partdef>]
+ <partdef> := <size>[@<offset>]
+
+ <blkdev-id> := unique id used to map driver to blockdev name
+ <size> := size in numbers of sectors
+ <offset> := offset in sectors for partition to start at
+
+ Example:
+ blkdevparts=mmc0:1024@0,524288@1024;mmc1:8192@0,8192@8192
+
config OSF_PARTITION
bool "Alpha OSF partition support" if PARTITION_ADVANCED
default y if ALPHA
diff --git a/fs/partitions/Makefile b/fs/partitions/Makefile
index 03af8eac51d..48b216c53db 100644
--- a/fs/partitions/Makefile
+++ b/fs/partitions/Makefile
@@ -7,6 +7,7 @@ obj-$(CONFIG_BLOCK) := check.o
obj-$(CONFIG_ACORN_PARTITION) += acorn.o
obj-$(CONFIG_AMIGA_PARTITION) += amiga.o
obj-$(CONFIG_ATARI_PARTITION) += atari.o
+obj-$(CONFIG_BLKDEV_PARTITION) += blkdev_parts.o
obj-$(CONFIG_MAC_PARTITION) += mac.o
obj-$(CONFIG_LDM_PARTITION) += ldm.o
obj-$(CONFIG_MSDOS_PARTITION) += msdos.o
diff --git a/fs/partitions/blkdev_parts.c b/fs/partitions/blkdev_parts.c
new file mode 100755
index 00000000000..48f4136d720
--- /dev/null
+++ b/fs/partitions/blkdev_parts.c
@@ -0,0 +1,127 @@
+/*
+ *
+ * Copyright (C) ST-Ericsson SA 2010
+ *
+ * Author: Ulf Hansson <ulf.hansson@stericsson.com> for ST-Ericsson
+ * License terms: GNU General Public License (GPL) version 2
+ *
+ * Create partitions for block devices by reading from the kernel
+ * command line (kernel boot arguments).
+ *
+ */
+
+#include "check.h"
+#include "blkdev_parts.h"
+
+static char *cmdline;
+
+/*
+ * This is the handler for our kernel commandline parameter,
+ * called from main.c::checksetup().
+ * Note that we can not yet kmalloc() anything, so we only save
+ * the commandline for later processing.
+ */
+static int cmdline_setup(char *s)
+{
+ cmdline = s;
+ return 1;
+}
+__setup("blkdevparts=", cmdline_setup);
+
+/* Parse for a matching blkdev-id and return pointer to partdef */
+static char *parse_blkdev_id(char *blkdev_name)
+{
+ int blkdev_id_len;
+ char *p, *blkdev_id;
+
+ /* Start parsing for a matching blkdev-id */
+ p = blkdev_id = cmdline;
+ while (blkdev_id != NULL) {
+
+ /* Find the end of the blkdev-id string */
+ p = strchr(blkdev_id, ':');
+ if (p == NULL)
+ return NULL;
+
+ /* Check if we found a matching blkdev-id */
+ blkdev_id_len = p - blkdev_id;
+ if (strlen(blkdev_name) == blkdev_id_len) {
+ if (strncmp(blkdev_name, blkdev_id, blkdev_id_len) == 0)
+ return p;
+ }
+
+ /* Move to next blkdev-id string if there is one */
+ blkdev_id = strchr(p, ';');
+ if (blkdev_id != NULL)
+ blkdev_id++;
+ }
+ return NULL;
+}
+
+static int parse_partdef(char **part, struct parsed_partitions *state, int part_nbr)
+{
+ sector_t size, offset;
+ char *p = *part;
+
+ /* Skip the beginning "," or ":" */
+ p++;
+
+ /* Fetch and verify size from partdef */
+ size = simple_strtoull(p, &p, 10);
+ if ((size == 0) || (*p != '@'))
+ return 0;
+
+ /* Skip the "@" */
+ p++;
+
+ /* Fetch offset from partdef and check if there are more parts */
+ offset = simple_strtoull(p, &p, 10);
+ if (*p == ',')
+ *part = p;
+ else
+ *part = NULL;
+
+ /* Add partition to state */
+ put_partition(state, part_nbr, offset, size);
+ printk(KERN_INFO "\nPartition: size=%llu, offset=%llu\n",
+ (unsigned long long) size,
+ (unsigned long long) offset);
+ return 1;
+}
+
+static int parse_blkdev_parts(char *blkdev_name, struct parsed_partitions *state)
+{
+ char *partdef;
+ int part_nbr = 0;
+
+ /* Find partdef */
+ partdef = parse_blkdev_id(blkdev_name);
+
+ /* Add parts */
+ while (partdef != NULL) {
+ /* Find next part and add it to state */
+ part_nbr++;
+ if (!parse_partdef(&partdef, state, part_nbr))
+ return 0;
+ }
+ return part_nbr;
+}
+
+int blkdev_partition(struct parsed_partitions *state, struct block_device *bdev)
+{
+ char blkdev_name[BDEVNAME_SIZE];
+
+ /* Check if there are any partitions to handle */
+ if (cmdline == NULL)
+ return 0;
+
+ /* Get the name of the blockdevice we are operating upon */
+ if (bdevname(bdev, blkdev_name) == NULL) {
+ printk(KERN_WARNING "Could not get a blkdev name\n");
+ return 0;
+ }
+
+ /* Parse for partitions and add them to the state */
+ return parse_blkdev_parts(blkdev_name, state);
+}
+
diff --git a/fs/partitions/blkdev_parts.h b/fs/partitions/blkdev_parts.h
new file mode 100755
index 00000000000..e6c5d40ed76
--- /dev/null
+++ b/fs/partitions/blkdev_parts.h
@@ -0,0 +1,14 @@
+/*
+ *
+ * Copyright (C) ST-Ericsson SA 2010
+ *
+ * Author: Ulf Hansson <ulf.hansson@stericsson.com> for ST-Ericsson
+ * License terms: GNU General Public License (GPL) version 2
+ *
+ * Create partitions for block devices by reading from the kernel
+ * command line (kernel boot arguments).
+ *
+ */
+
+int blkdev_partition(struct parsed_partitions *state, struct block_device *bdev);
+
diff --git a/fs/partitions/check.c b/fs/partitions/check.c
index d545e97d99c..f287f8608e1 100644
--- a/fs/partitions/check.c
+++ b/fs/partitions/check.c
@@ -27,6 +27,7 @@
#include "acorn.h"
#include "amiga.h"
#include "atari.h"
+#include "blkdev_parts.h"
#include "ldm.h"
#include "mac.h"
#include "msdos.h"
@@ -50,6 +51,9 @@ static int (*check_part[])(struct parsed_partitions *) = {
* Probe partition formats with tables at disk address 0
* that also have an ADFS boot block at 0xdc0.
*/
+#ifdef CONFIG_BLKDEV_PARTITION
+ blkdev_partition,
+#endif
#ifdef CONFIG_ACORN_PARTITION_ICS
adfspart_check_ICS,
#endif