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Subject[PATCH 04/10] UBI: Add self_check_eba()
Date
self_check_eba() compares two ubi_attach_info objects.
Fastmap uses this function for self checks.

Signed-off-by: Richard Weinberger <richard@nod.at>
---
drivers/mtd/ubi/eba.c | 96 +++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 96 insertions(+), 0 deletions(-)

diff --git a/drivers/mtd/ubi/eba.c b/drivers/mtd/ubi/eba.c
index 0910c2c..8af2ebf 100644
--- a/drivers/mtd/ubi/eba.c
+++ b/drivers/mtd/ubi/eba.c
@@ -1202,6 +1202,102 @@ static void print_rsvd_warning(struct ubi_device *ubi,
}

/**
+ * self_check_eba - run a self check on the EBA table constructed by fastmap.
+ * @ubi: UBI device description object
+ * @ai_fastmap: UBI attach info object created by fastmap
+ * @ai_scan: UBI attach info object created by scanning
+ *
+ * Returns < 0 in case of an internal error, 0 otherwise.
+ * If a bad EBA table entry was found it will be printed out and
+ * ubi_assert() triggers.
+ */
+int self_check_eba(struct ubi_device *ubi, struct ubi_attach_info *ai_fastmap,
+ struct ubi_attach_info *ai_scan)
+{
+ int i, j, num_volumes, ret = 0;
+ int **scan_eba, **fm_eba;
+ struct ubi_ainf_volume *av;
+ struct ubi_volume *vol;
+ struct ubi_ainf_peb *aeb;
+ struct rb_node *rb;
+
+ num_volumes = ubi->vtbl_slots + UBI_INT_VOL_COUNT;
+
+ scan_eba = kmalloc(sizeof(*scan_eba) * num_volumes, GFP_KERNEL);
+ if (!scan_eba)
+ return -ENOMEM;
+
+ fm_eba = kmalloc(sizeof(*fm_eba) * num_volumes, GFP_KERNEL);
+ if (!fm_eba) {
+ kfree(scan_eba);
+ return -ENOMEM;
+ }
+
+ for (i = 0; i < num_volumes; i++) {
+ vol = ubi->volumes[i];
+ if (!vol)
+ continue;
+
+ scan_eba[i] = kmalloc(vol->reserved_pebs * sizeof(**scan_eba),
+ GFP_KERNEL);
+ if (!scan_eba[i]) {
+ ret = -ENOMEM;
+ goto out_free;
+ }
+
+ fm_eba[i] = kmalloc(vol->reserved_pebs * sizeof(**fm_eba),
+ GFP_KERNEL);
+ if (!scan_eba[i]) {
+ ret = -ENOMEM;
+ goto out_free;
+ }
+
+ for (j = 0; j < vol->reserved_pebs; j++)
+ scan_eba[i][j] = fm_eba[i][j] = UBI_LEB_UNMAPPED;
+
+ av = ubi_find_av(ai_scan, idx2vol_id(ubi, i));
+ if (!av)
+ continue;
+
+ ubi_rb_for_each_entry(rb, aeb, &av->root, u.rb)
+ scan_eba[i][aeb->lnum] = aeb->pnum;
+
+ av = ubi_find_av(ai_fastmap, idx2vol_id(ubi, i));
+ if (!av)
+ continue;
+
+ ubi_rb_for_each_entry(rb, aeb, &av->root, u.rb)
+ fm_eba[i][aeb->lnum] = aeb->pnum;
+
+ for (j = 0; j < vol->reserved_pebs; j++) {
+ if (scan_eba[i][j] != fm_eba[i][j]) {
+ if (scan_eba[i][j] == UBI_LEB_UNMAPPED ||
+ fm_eba[i][j] == UBI_LEB_UNMAPPED)
+ continue;
+
+ ubi_err("LEB:%i:%i is PEB:%i instead of %i!",
+ vol->vol_id, i, fm_eba[i][j],
+ scan_eba[i][j]);
+ ubi_assert(0);
+ }
+ }
+ }
+
+out_free:
+ for (i = 0; i < num_volumes; i++) {
+ if (!ubi->volumes[i])
+ continue;
+
+ kfree(scan_eba[i]);
+ kfree(fm_eba[i]);
+ }
+
+ kfree(scan_eba);
+ kfree(fm_eba);
+ return ret;
+}
+
+/**
* ubi_eba_init - initialize the EBA sub-system using attaching information.
* @ubi: UBI device description object
* @ai: attaching information
--
1.7.6.5


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