[PATCH 7/7] [RFC] UBI: Wire up fastmap support
Richard Weinberger
richard at nod.at
Wed May 16 16:52:02 EDT 2012
This commit enables fastmap per default.
Signed-off-by: Richard Weinberger <richard at nod.at>
---
drivers/mtd/ubi/Kconfig | 26 +++++++++++++++
drivers/mtd/ubi/build.c | 76 ++++++++++++++++++++++++++++++++++++++++++-
drivers/mtd/ubi/scan.c | 5 ++-
drivers/mtd/ubi/ubi-media.h | 13 ++------
drivers/mtd/ubi/wl.c | 32 +++++++++++++++++-
5 files changed, 137 insertions(+), 15 deletions(-)
diff --git a/drivers/mtd/ubi/Kconfig b/drivers/mtd/ubi/Kconfig
index 4dcc752..fd09f10 100644
--- a/drivers/mtd/ubi/Kconfig
+++ b/drivers/mtd/ubi/Kconfig
@@ -42,6 +42,32 @@ config MTD_UBI_BEB_RESERVE
eraseblocks (e.g. NOR flash), this value is ignored and nothing is
reserved. Leave the default value if unsure.
+config MTD_UBI_FM_POOL_SIZE
+ int "Max number of PEBs in a fastmap pool"
+ range 10 1024
+ default 128
+ help
+ This is the number PEBs which have to be scanned while attaching.
+ A low value means that attaching will be faster but if the value
+ is too small the fastmap has to be written too often.
+ Every time the pool is full a new fastmap is written to the MTD.
+ Choose wisely!
+
+config MTD_UBI_FM_MAX_SIZE
+ int "Maximal size of a fastmap in PEBs"
+ range 10 128
+ default 32
+ help
+ Maximale size of a checkpoint in PEBs.
+
+config MTD_UBI_FM_SB_POS
+ int "Fastmap super block position"
+ range 4 128
+ default 64
+ help
+ The fastmap super block will be placed within the first N PEBs.
+ Is this value too large it takes longer to find the checkpoint.
+
config MTD_UBI_GLUEBI
tristate "MTD devices emulation driver (gluebi)"
help
diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
index 0fde9fc..2399511 100644
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -148,6 +148,16 @@ int ubi_volume_notify(struct ubi_device *ubi, struct ubi_volume *vol, int ntype)
ubi_do_get_device_info(ubi, &nt.di);
ubi_do_get_volume_info(ubi, vol, &nt.vi);
+
+ switch (ntype) {
+ case UBI_VOLUME_ADDED:
+ case UBI_VOLUME_REMOVED:
+ case UBI_VOLUME_RESIZED:
+ case UBI_VOLUME_RENAMED:
+ if (ubi_update_fastmap(ubi))
+ ubi_err("Unable to update fastmap!");
+ }
+
return blocking_notifier_call_chain(&ubi_notifiers, ntype, &nt);
}
@@ -852,6 +862,59 @@ static int autoresize(struct ubi_device *ubi, int vol_id)
return 0;
}
+static int attach_by_fastmap(struct ubi_device *ubi)
+{
+ int fm_start, err;
+ struct ubi_scan_info *si;
+
+ fm_start = ubi_find_fastmap(ubi);
+ if (fm_start < 0)
+ return -ENOENT;
+
+ si = ubi_read_fastmap(ubi, fm_start);
+ if (IS_ERR(si))
+ return PTR_ERR(si);
+
+ ubi->bad_peb_count = 0;
+ ubi->good_peb_count = ubi->peb_count;
+ ubi->corr_peb_count = 0;
+ ubi->max_ec = si->max_ec;
+ ubi->mean_ec = si->mean_ec;
+ ubi_msg("max. sequence number: %llu", si->max_sqnum);
+
+ err = ubi_read_volume_table(ubi, si);
+ if (err) {
+ ubi_err("ubi_read_volume_table failed");
+ goto out_si;
+ }
+
+ err = ubi_wl_init_scan(ubi, si);
+ if (err) {
+ ubi_err("ubi_wl_init_scan failed!");
+ goto out_vtbl;
+ }
+
+ err = ubi_eba_init_scan(ubi, si);
+ if (err) {
+ ubi_err("ubi_eba_init_scan failed!");
+ goto out_wl;
+ }
+
+ ubi_msg("successfully attached via fastmapping!");
+ ubi_scan_destroy_si(si);
+ return 0;
+
+out_wl:
+ ubi_wl_close(ubi);
+out_vtbl:
+ free_internal_volumes(ubi);
+ vfree(ubi->vtbl);
+out_si:
+ ubi_scan_destroy_si(si);
+
+ return err;
+}
+
/**
* ubi_attach_mtd_dev - attach an MTD device.
* @mtd: MTD device description object
@@ -931,6 +994,9 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, int vid_hdr_offset)
ubi->vid_hdr_offset = vid_hdr_offset;
ubi->autoresize_vol_id = -1;
+ ubi->fm_pool.used = ubi->fm_pool.size = 0;
+ ubi->fm_pool.max_size = ARRAY_SIZE(ubi->fm_pool.pebs);
+
mutex_init(&ubi->buf_mutex);
mutex_init(&ubi->ckvol_mutex);
mutex_init(&ubi->device_mutex);
@@ -953,7 +1019,15 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, int vid_hdr_offset)
if (err)
goto out_free;
- err = attach_by_scanning(ubi);
+ err = attach_by_fastmap(ubi);
+ if (err) {
+ if (err != -ENOENT)
+ ubi_msg("falling back to attach by scanning mode!");
+
+ ubi->attached_by_scanning = true;
+ err = attach_by_scanning(ubi);
+ }
+
if (err) {
dbg_err("failed to attach by scanning, error %d", err);
goto out_debugging;
diff --git a/drivers/mtd/ubi/scan.c b/drivers/mtd/ubi/scan.c
index b4ab79f..2408a0d 100644
--- a/drivers/mtd/ubi/scan.c
+++ b/drivers/mtd/ubi/scan.c
@@ -1014,8 +1014,9 @@ static int process_eb(struct ubi_device *ubi, struct ubi_scan_info *si,
if (vol_id > UBI_MAX_VOLUMES &&
vol_id != UBI_LAYOUT_VOLUME_ID &&
- vol_id != UBI_FM_SB_VOLUME_ID &&
- vol_id != UBI_FM_DATA_VOLUME_ID) {
+ ((vol_id != UBI_FM_SB_VOLUME_ID &&
+ vol_id != UBI_FM_DATA_VOLUME_ID) ||
+ ubi->attached_by_scanning == true)) {
int lnum = be32_to_cpu(vidh->lnum);
/* Unsupported internal volume */
diff --git a/drivers/mtd/ubi/ubi-media.h b/drivers/mtd/ubi/ubi-media.h
index a23196f..19ddbba 100644
--- a/drivers/mtd/ubi/ubi-media.h
+++ b/drivers/mtd/ubi/ubi-media.h
@@ -389,16 +389,9 @@ struct ubi_vtbl_record {
#define UBI_FM_POOL_MAGIC 0x67AF4D08
#define UBI_FM_EBA_MAGIC 0xf0c040a8
-/* Semi-sane default values - TBR */
-#ifndef UBI_FM_MAX_POOL_SIZE
-#define UBI_FM_MAX_POOL_SIZE 128
-#endif
-#ifndef UBI_FM_MAX_BLOCKS
-#define UBI_FM_MAX_BLOCKS 32
-#endif
-#ifndef UBI_FM_MAX_START
-#define UBI_FM_MAX_START 64
-#endif
+#define UBI_FM_MAX_START CONFIG_MTD_UBI_FM_SB_POS
+#define UBI_FM_MAX_BLOCKS CONFIG_MTD_UBI_FM_MAX_SIZE
+#define UBI_FM_MAX_POOL_SIZE CONFIG_MTD_UBI_FM_POOL_SIZE
/**
* struct ubi_fm_sb - UBI fastmap super block
diff --git a/drivers/mtd/ubi/wl.c b/drivers/mtd/ubi/wl.c
index a329358..c94a84a 100644
--- a/drivers/mtd/ubi/wl.c
+++ b/drivers/mtd/ubi/wl.c
@@ -393,7 +393,6 @@ static struct ubi_wl_entry *find_wl_entry(struct rb_root *root, int diff)
}
/**
- * ubi_wl_get_peb - get a physical eraseblock.
* find_early_wl_entry - find wear-leveling entry with a low pnum.
* @root: the RB-tree where to look for
* @max_pnum: highest possible pnum
@@ -451,12 +450,13 @@ out:
}
/**
+ * __ubi_wl_get_peb - get a physical eraseblock.
* @ubi: UBI device description object
*
* This function returns a physical eraseblock in case of success and a
* negative error code in case of failure. Might sleep.
*/
-int ubi_wl_get_peb(struct ubi_device *ubi)
+static int __ubi_wl_get_peb(struct ubi_device *ubi)
{
int err;
struct ubi_wl_entry *e, *first, *last;
@@ -507,6 +507,34 @@ retry:
return e->pnum;
}
+/* ubi_wl_get_peb - works exaclty like __ubi_wl_get_peb but keeps track of
+ * the fastmap pool.
+ */
+int ubi_wl_get_peb(struct ubi_device *ubi)
+{
+ struct ubi_fm_pool *pool = &ubi->fm_pool;
+
+ /* pool contains no free blocks, create a new one
+ * and write a fastmap */
+ if (pool->used == pool->size || !pool->size) {
+ for (pool->size = 0; pool->size < pool->max_size;
+ pool->size++) {
+ pool->pebs[pool->size] = __ubi_wl_get_peb(ubi);
+ if (pool->pebs[pool->size] < 0)
+ break;
+ }
+
+ pool->used = 0;
+ ubi_update_fastmap(ubi);
+ }
+
+ /* we got not a single free PEB */
+ if (!pool->size)
+ return -1;
+
+ return pool->pebs[pool->used++];
+}
+
/**
* prot_queue_del - remove a physical eraseblock from the protection queue.
* @ubi: UBI device description object
--
1.7.6.5
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