[RFC PATCH mtd-utils 079/110] fsck.ubifs: Consolidate log

[Zhihao Cheng]

This is the 4/18 step of fsck. Consolidate log to ensure enough space
in log area. There could be following possible errors:
 1. corrupted scanning data in log area: danger mode with rebuild_fs and
    normal mode with 'yes' answer will turn to rebuild filesystem, other
    modes will exit.

Signed-off-by: Zhihao Cheng <chengzhihao1@xxxxxxxxxx>
---
 ubifs-utils/fsck.ubifs/fsck.ubifs.c |  1 +
 ubifs-utils/fsck.ubifs/load_fs.c    | 26 ++++++++++++++++++++++++++
 ubifs-utils/libubifs/log.c          |  1 +
 3 files changed, 28 insertions(+)

diff --git a/ubifs-utils/fsck.ubifs/fsck.ubifs.c b/ubifs-utils/fsck.ubifs/fsck.ubifs.c
index 4d5296d7..9d69a4fd 100644
--- a/ubifs-utils/fsck.ubifs/fsck.ubifs.c
+++ b/ubifs-utils/fsck.ubifs/fsck.ubifs.c
@@ -433,6 +433,7 @@ int main(int argc, char *argv[])
 	 * Step 1: Read master & init lpt
 	 * Step 2: Replay journal
 	 * Step 3: Handle orphan nodes
+	 * Step 4: Consolidate log
 	 */
 	err = ubifs_load_filesystem(c);
 	if (err) {
diff --git a/ubifs-utils/fsck.ubifs/load_fs.c b/ubifs-utils/fsck.ubifs/load_fs.c
index f376383c..42b1afaa 100644
--- a/ubifs-utils/fsck.ubifs/load_fs.c
+++ b/ubifs-utils/fsck.ubifs/load_fs.c
@@ -199,6 +199,32 @@ int ubifs_load_filesystem(struct ubifs_info *c)
 		goto out_orphans;
 	}
 
+	if (!c->ro_mount) {
+		int lnum;
+
+		/* Check for enough log space */
+		lnum = c->lhead_lnum + 1;
+		if (lnum >= UBIFS_LOG_LNUM + c->log_lebs)
+			lnum = UBIFS_LOG_LNUM;
+		if (lnum == c->ltail_lnum) {
+			log_out(c, "Consolidate log");
+			err = ubifs_consolidate_log(c);
+			if (err) {
+				unsigned int reason = get_failure_reason_callback(c);
+
+				clear_failure_reason_callback(c);
+				if (reason & FR_DATA_CORRUPTED) {
+					if (fix_problem(c, LOG_CORRUPTED, NULL))
+						FSCK(c)->try_rebuild = true;
+				} else {
+					ubifs_assert(c, reason == 0);
+					exit_code |= FSCK_ERROR;
+				}
+				goto out_orphans;
+			}
+		}
+	}
+
 	c->mounting = 0;
 
 	return 0;
diff --git a/ubifs-utils/libubifs/log.c b/ubifs-utils/libubifs/log.c
index 0d459261..c3dfd98e 100644
--- a/ubifs-utils/libubifs/log.c
+++ b/ubifs-utils/libubifs/log.c
@@ -711,6 +711,7 @@ int ubifs_consolidate_log(struct ubifs_info *c)
 	destroy_done_tree(&done_tree);
 	vfree(buf);
 	if (write_lnum == c->lhead_lnum) {
+		set_failure_reason_callback(c, FR_DATA_CORRUPTED);
 		ubifs_err(c, "log is too full");
 		return -EINVAL;
 	}
-- 
2.13.6