UBI: Add fastmap bits to build.c

Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

1 files changed, 65 insertions, 3 deletions

diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
index 34977039850c..c9b99be8f6d5 100644
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -76,7 +76,10 @@ static int __initdata mtd_devs;
 
 /* MTD devices specification parameters */
 static struct mtd_dev_param __initdata mtd_dev_param[UBI_MAX_DEVICES];
-
+#ifdef CONFIG_MTD_UBI_FASTMAP
+/* UBI module parameter to enable fastmap automatically on non-fastmap images */
+static bool fm_autoconvert;
+#endif
 /* Root UBI "class" object (corresponds to '/<sysfs>/class/ubi/') */
 struct class *ubi_class;
 
@@ -153,6 +156,19 @@ 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);
+
+#ifdef CONFIG_MTD_UBI_FASTMAP
+        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!");
+                        ubi_ro_mode(ubi);
+                }
+        }
+#endif
         return blocking_notifier_call_chain(&ubi_notifiers, ntype, &nt);
 }
 
@@ -918,10 +934,40 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num,
         ubi->vid_hdr_offset = vid_hdr_offset;
         ubi->autoresize_vol_id = -1;
 
+#ifdef CONFIG_MTD_UBI_FASTMAP
+        ubi->fm_pool.used = ubi->fm_pool.size = 0;
+        ubi->fm_wl_pool.used = ubi->fm_wl_pool.size = 0;
+
+        /*
+         * fm_pool.max_size is 5% of the total number of PEBs but it's also
+         * between UBI_FM_MAX_POOL_SIZE and UBI_FM_MIN_POOL_SIZE.
+         */
+        ubi->fm_pool.max_size = min(((int)mtd_div_by_eb(ubi->mtd->size,
+                ubi->mtd) / 100) * 5, UBI_FM_MAX_POOL_SIZE);
+        if (ubi->fm_pool.max_size < UBI_FM_MIN_POOL_SIZE)
+                ubi->fm_pool.max_size = UBI_FM_MIN_POOL_SIZE;
+
+        ubi->fm_wl_pool.max_size = UBI_FM_WL_POOL_SIZE;
+        ubi->fm_disabled = !fm_autoconvert;
+
+        if (!ubi->fm_disabled && (int)mtd_div_by_eb(ubi->mtd->size, ubi->mtd)
+            <= UBI_FM_MAX_START) {
+                ubi_err("More than %i PEBs are needed for fastmap, sorry.",
+                        UBI_FM_MAX_START);
+                ubi->fm_disabled = 1;
+        }
+
+        ubi_msg("default fastmap pool size: %d", ubi->fm_pool.max_size);
+        ubi_msg("default fastmap WL pool size: %d", ubi->fm_wl_pool.max_size);
+#else
+        ubi->fm_disabled = 1;
+#endif
         mutex_init(&ubi->buf_mutex);
         mutex_init(&ubi->ckvol_mutex);
         mutex_init(&ubi->device_mutex);
         spin_lock_init(&ubi->volumes_lock);
+        mutex_init(&ubi->fm_mutex);
+        init_rwsem(&ubi->fm_sem);
 
         ubi_msg("attaching mtd%d to ubi%d", mtd->index, ubi_num);
 
@@ -934,6 +980,12 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num,
         if (!ubi->peb_buf)
                 goto out_free;
 
+#ifdef CONFIG_MTD_UBI_FASTMAP
+        ubi->fm_size = ubi_calc_fm_size(ubi);
+        ubi->fm_buf = vzalloc(ubi->fm_size);
+        if (!ubi->fm_buf)
+                goto out_free;
+#endif
         err = ubi_debugging_init_dev(ubi);
         if (err)
                 goto out_free;
@@ -1012,6 +1064,7 @@ out_debugging:
         ubi_debugging_exit_dev(ubi);
 out_free:
         vfree(ubi->peb_buf);
+        vfree(ubi->fm_buf);
         if (ref)
                 put_device(&ubi->dev);
         else
@@ -1061,7 +1114,11 @@ int ubi_detach_mtd_dev(int ubi_num, int anyway)
         ubi_assert(ubi_num == ubi->ubi_num);
         ubi_notify_all(ubi, UBI_VOLUME_REMOVED, NULL);
         ubi_msg("detaching mtd%d from ubi%d", ubi->mtd->index, ubi_num);
-
+#ifdef CONFIG_MTD_UBI_FASTMAP
+        /* If we don't write a new fastmap at detach time we lose all
+         * EC updates that have been made since the last written fastmap. */
+        ubi_update_fastmap(ubi);
+#endif
         /*
          * Before freeing anything, we have to stop the background thread to
          * prevent it from doing anything on this device while we are freeing.
@@ -1077,12 +1134,14 @@ int ubi_detach_mtd_dev(int ubi_num, int anyway)
 
         ubi_debugfs_exit_dev(ubi);
         uif_close(ubi);
+
         ubi_wl_close(ubi);
         ubi_free_internal_volumes(ubi);
         vfree(ubi->vtbl);
         put_mtd_device(ubi->mtd);
         ubi_debugging_exit_dev(ubi);
         vfree(ubi->peb_buf);
+        vfree(ubi->fm_buf);
         ubi_msg("mtd%d is detached from ubi%d", ubi->mtd->index, ubi->ubi_num);
         put_device(&ubi->dev);
         return 0;
@@ -1404,7 +1463,10 @@ MODULE_PARM_DESC(mtd, "MTD devices to attach. Parameter format: mtd=<name|num|pa
                       "Example 2: mtd=content,1984 mtd=4 - attach MTD device with name \"content\" using VID header offset 1984, and MTD device number 4 with default VID header offset.\n"
                       "Example 3: mtd=/dev/mtd1,0,25 - attach MTD device /dev/mtd1 using default VID header offset and reserve 25*nand_size_in_blocks/1024 erase blocks for bad block handling.\n"
                       "\t(e.g. if the NAND *chipset* has 4096 PEB, 100 will be reserved for this UBI device).");
-
+#ifdef CONFIG_MTD_UBI_FASTMAP
+module_param(fm_autoconvert, bool, 0644);
+MODULE_PARM_DESC(fm_autoconvert, "Set this parameter to enable fastmap automatically on images without a fastmap.");
+#endif
 MODULE_VERSION(__stringify(UBI_VERSION));
 MODULE_DESCRIPTION("UBI - Unsorted Block Images");
 MODULE_AUTHOR("Artem Bityutskiy");