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authorAdrian Hunter <adrian.hunter@nokia.com>2009-06-26 14:58:01 +0300
committerArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2009-07-05 18:47:07 +0300
commit0c6c7fa1313fcb69cae35e34168d2e83b8da854a (patch)
tree5ba3c6eda144b060829529096f30c6f83e357d5b /drivers/mtd/ubi
parent1398788fe7b730db10e97dcb9f838603e41922d5 (diff)
downloadlinux-0c6c7fa1313fcb69cae35e34168d2e83b8da854a.tar.bz2
UBI: add image sequence number to EC header
An image sequence number is added to the UBI erase-counter header to be able determine if the root file system contains a mixture of old and new images (because the flashing failed to complete). A change to nolo is also needed for this to take effect. Signed-off-by: Adrian Hunter <adrian.hunter@nokia.com> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Diffstat (limited to 'drivers/mtd/ubi')
-rw-r--r--drivers/mtd/ubi/build.c1
-rw-r--r--drivers/mtd/ubi/debug.c2
-rw-r--r--drivers/mtd/ubi/io.c15
-rw-r--r--drivers/mtd/ubi/scan.c2
-rw-r--r--drivers/mtd/ubi/ubi-media.h12
-rw-r--r--drivers/mtd/ubi/ubi.h4
6 files changed, 33 insertions, 3 deletions
diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
index 286ed594e5a0..db0b9cb64c6c 100644
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -996,6 +996,7 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, int vid_hdr_offset)
ubi_msg("number of PEBs reserved for bad PEB handling: %d",
ubi->beb_rsvd_pebs);
ubi_msg("max/mean erase counter: %d/%d", ubi->max_ec, ubi->mean_ec);
+ ubi_msg("image sequence number: %d", ubi->image_seq);
/*
* The below lock makes sure we do not race with 'ubi_thread()' which
diff --git a/drivers/mtd/ubi/debug.c b/drivers/mtd/ubi/debug.c
index c0ed60e8ade9..54b0186915fb 100644
--- a/drivers/mtd/ubi/debug.c
+++ b/drivers/mtd/ubi/debug.c
@@ -44,6 +44,8 @@ void ubi_dbg_dump_ec_hdr(const struct ubi_ec_hdr *ec_hdr)
be32_to_cpu(ec_hdr->vid_hdr_offset));
printk(KERN_DEBUG "\tdata_offset %d\n",
be32_to_cpu(ec_hdr->data_offset));
+ printk(KERN_DEBUG "\timage_seq %d\n",
+ be32_to_cpu(ec_hdr->image_seq));
printk(KERN_DEBUG "\thdr_crc %#08x\n",
be32_to_cpu(ec_hdr->hdr_crc));
printk(KERN_DEBUG "erase counter header hexdump:\n");
diff --git a/drivers/mtd/ubi/io.c b/drivers/mtd/ubi/io.c
index c8edbfd09b64..b58714011091 100644
--- a/drivers/mtd/ubi/io.c
+++ b/drivers/mtd/ubi/io.c
@@ -563,15 +563,16 @@ int ubi_io_mark_bad(const struct ubi_device *ubi, int pnum)
* This function returns zero if the erase counter header is OK, and %1 if
* not.
*/
-static int validate_ec_hdr(const struct ubi_device *ubi,
+static int validate_ec_hdr(struct ubi_device *ubi,
const struct ubi_ec_hdr *ec_hdr)
{
long long ec;
- int vid_hdr_offset, leb_start;
+ int vid_hdr_offset, leb_start, image_seq;
ec = be64_to_cpu(ec_hdr->ec);
vid_hdr_offset = be32_to_cpu(ec_hdr->vid_hdr_offset);
leb_start = be32_to_cpu(ec_hdr->data_offset);
+ image_seq = be32_to_cpu(ec_hdr->image_seq);
if (ec_hdr->version != UBI_VERSION) {
ubi_err("node with incompatible UBI version found: "
@@ -597,6 +598,15 @@ static int validate_ec_hdr(const struct ubi_device *ubi,
goto bad;
}
+ if (!ubi->image_seq_set) {
+ ubi->image_seq = image_seq;
+ ubi->image_seq_set = 1;
+ } else if (ubi->image_seq != image_seq) {
+ ubi_err("bad image sequence number %d, expected %d",
+ image_seq, ubi->image_seq);
+ goto bad;
+ }
+
return 0;
bad:
@@ -742,6 +752,7 @@ int ubi_io_write_ec_hdr(struct ubi_device *ubi, int pnum,
ec_hdr->version = UBI_VERSION;
ec_hdr->vid_hdr_offset = cpu_to_be32(ubi->vid_hdr_offset);
ec_hdr->data_offset = cpu_to_be32(ubi->leb_start);
+ ec_hdr->image_seq = cpu_to_be32(ubi->image_seq);
crc = crc32(UBI_CRC32_INIT, ec_hdr, UBI_EC_HDR_SIZE_CRC);
ec_hdr->hdr_crc = cpu_to_be32(crc);
diff --git a/drivers/mtd/ubi/scan.c b/drivers/mtd/ubi/scan.c
index c3d653ba5ca0..72570ed7d33f 100644
--- a/drivers/mtd/ubi/scan.c
+++ b/drivers/mtd/ubi/scan.c
@@ -910,6 +910,8 @@ struct ubi_scan_info *ubi_scan(struct ubi_device *ubi)
if (si->is_empty)
ubi_msg("empty MTD device detected");
+ ubi->image_seq_set = 1;
+
/*
* In case of unknown erase counter we use the mean erase counter
* value.
diff --git a/drivers/mtd/ubi/ubi-media.h b/drivers/mtd/ubi/ubi-media.h
index 8419fdccc79c..503ea9b27309 100644
--- a/drivers/mtd/ubi/ubi-media.h
+++ b/drivers/mtd/ubi/ubi-media.h
@@ -129,6 +129,7 @@ enum {
* @ec: the erase counter
* @vid_hdr_offset: where the VID header starts
* @data_offset: where the user data start
+ * @image_seq: image sequence number
* @padding2: reserved for future, zeroes
* @hdr_crc: erase counter header CRC checksum
*
@@ -144,6 +145,14 @@ enum {
* volume identifier header and user data, relative to the beginning of the
* physical eraseblock. These values have to be the same for all physical
* eraseblocks.
+ *
+ * The @image_seq field is used to validate a UBI image that has been prepared
+ * for a UBI device. The @image_seq value can be any value, but it must be the
+ * same on all eraseblocks. UBI will ensure that all new erase counter headers
+ * also contain this value, and will check the value when scanning at start-up.
+ * One way to make use of @image_seq is to increase its value by one every time
+ * an image is flashed over an existing image, then, if the flashing does not
+ * complete, UBI will detect the error when scanning.
*/
struct ubi_ec_hdr {
__be32 magic;
@@ -152,7 +161,8 @@ struct ubi_ec_hdr {
__be64 ec; /* Warning: the current limit is 31-bit anyway! */
__be32 vid_hdr_offset;
__be32 data_offset;
- __u8 padding2[36];
+ __be32 image_seq;
+ __u8 padding2[32];
__be32 hdr_crc;
} __attribute__ ((packed));
diff --git a/drivers/mtd/ubi/ubi.h b/drivers/mtd/ubi/ubi.h
index 28acd133c997..bb372c4222b7 100644
--- a/drivers/mtd/ubi/ubi.h
+++ b/drivers/mtd/ubi/ubi.h
@@ -301,6 +301,8 @@ struct ubi_wl_entry;
* @vol->readers, @vol->writers, @vol->exclusive,
* @vol->ref_count, @vol->mapping and @vol->eba_tbl.
* @ref_count: count of references on the UBI device
+ * @image_seq: image sequence number recorded on EC headers
+ * @image_seq_set: indicates @image_seq is known
*
* @rsvd_pebs: count of reserved physical eraseblocks
* @avail_pebs: count of available physical eraseblocks
@@ -390,6 +392,8 @@ struct ubi_device {
struct ubi_volume *volumes[UBI_MAX_VOLUMES+UBI_INT_VOL_COUNT];
spinlock_t volumes_lock;
int ref_count;
+ int image_seq;
+ int image_seq_set;
int rsvd_pebs;
int avail_pebs;