ext4-corrupted-inode-block-bitmaps-handling-patches.patch

Since we could skip corrupt block groups, this patch
use ext4_warning() intead of ext4_error() to make FS not
emount RO in default, also fix a leftover from upstream
commit 163a203ddb36c36d4a1c942
---
diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index e069155..692b5e4 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -185,25 +185,17 @@ static int ext4_init_block_bitmap(struct super_block *sb,
 	struct ext4_sb_info *sbi = EXT4_SB(sb);
 	ext4_fsblk_t start, tmp;
 	int flex_bg = 0;
-	struct ext4_group_info *grp;
 
 	J_ASSERT_BH(bh, buffer_locked(bh));
 
 	/* If checksum is bad mark all blocks used to prevent allocation
 	 * essentially implementing a per-group read-only flag. */
 	if (!ext4_group_desc_csum_verify(sb, block_group, gdp)) {
-		grp = ext4_get_group_info(sb, block_group);
-		if (!EXT4_MB_GRP_BBITMAP_CORRUPT(grp))
-			percpu_counter_sub(&sbi->s_freeclusters_counter,
-					   grp->bb_free);
-		set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &grp->bb_state);
-		if (!EXT4_MB_GRP_IBITMAP_CORRUPT(grp)) {
-			int count;
-			count = ext4_free_inodes_count(sb, gdp);
-			percpu_counter_sub(&sbi->s_freeinodes_counter,
-					   count);
-		}
-		set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &grp->bb_state);
+		ext4_corrupted_block_group(sb, block_group,
+				EXT4_GROUP_INFO_BBITMAP_CORRUPT |
+				EXT4_GROUP_INFO_IBITMAP_CORRUPT,
+				"Checksum bad for group %u",
+				block_group);
		return -EFSBADCRC;
 	}
 	memset(bh->b_data, 0, sb->s_blocksize);
@@ -367,7 +359,6 @@ static void ext4_validate_block_bitmap(struct super_block *sb,
 {
 	ext4_fsblk_t	blk;
 	struct ext4_group_info *grp = ext4_get_group_info(sb, block_group);
-	struct ext4_sb_info *sbi = EXT4_SB(sb);
 
 	if (buffer_verified(bh))
		return 0;
@@ -377,22 +367,19 @@ static void ext4_validate_block_bitmap(struct super_block *sb,
 	if (unlikely(!ext4_block_bitmap_csum_verify(sb, block_group,
 			desc, bh))) {
 		ext4_unlock_group(sb, block_group);
-		ext4_error(sb, "bg %u: bad block bitmap checksum", block_group);
-		if (!EXT4_MB_GRP_BBITMAP_CORRUPT(grp))
-			percpu_counter_sub(&sbi->s_freeclusters_counter,
-					   grp->bb_free);
-		set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &grp->bb_state);
+		ext4_corrupted_block_group(sb, block_group,
+				EXT4_GROUP_INFO_BBITMAP_CORRUPT,
+				"bg %u: bad block bitmap checksum",
+				block_group);
		return -EFSBADCRC;
 	}
 	blk = ext4_valid_block_bitmap(sb, desc, block_group, bh);
 	if (unlikely(blk != 0)) {
 		ext4_unlock_group(sb, block_group);
-		ext4_error(sb, "bg %u: block %llu: invalid block bitmap",
-			   block_group, blk);
-		if (!EXT4_MB_GRP_BBITMAP_CORRUPT(grp))
-			percpu_counter_sub(&sbi->s_freeclusters_counter,
-					   grp->bb_free);
-		set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &grp->bb_state);
+		ext4_corrupted_block_group(sb, block_group,
+				EXT4_GROUP_INFO_BBITMAP_CORRUPT,
+				"bg %u: block %llu: invalid block bitmap",
+				block_group, blk);
		return -EFSCORRUPTED;
 	}
 	set_buffer_verified(bh);
@@ -445,8 +432,6 @@ ext4_read_block_bitmap_nowait(struct super_block *sb, ext4_group_t block_group)
 		ext4_unlock_group(sb, block_group);
 		unlock_buffer(bh);
		if (err) {
-			ext4_error(sb, "Failed to init block bitmap for group "
-				   "%u: %d", block_group, err);
			goto out;
		}
		goto verify;
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 3c41773..63a63b6 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -91,6 +91,17 @@ typedef __u32 ext4_lblk_t;
 /* data type for block group number */
 typedef unsigned int ext4_group_t;
 
+void __ext4_corrupted_block_group(struct super_block *sb,
+				  ext4_group_t group, unsigned int flags,
+				  const char *function, unsigned int line);
+
+#define ext4_corrupted_block_group(sb, group, flags, fmt, ...)		\
+	do {								\
+		__ext4_warning(sb, __func__, __LINE__, fmt,		\
+				##__VA_ARGS__);				\
+		__ext4_corrupted_block_group(sb, group, flags,		\
+					__func__, __LINE__);		\
+	} while (0)
 /*
  * Flags used in mballoc's allocation_context flags field.
  *
@@ -2673,7 +2684,11 @@ struct ext4_group_info {
 #define EXT4_GROUP_INFO_NEED_INIT_BIT		0
 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT		1
 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT	2
+#define EXT4_GROUP_INFO_BBITMAP_CORRUPT		\
+	(1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)
 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT	3
+#define EXT4_GROUP_INFO_IBITMAP_CORRUPT		\
+	(1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)
 
 #define EXT4_MB_GRP_NEED_INIT(grp)	\
 	(test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index fc65310..92bcc8d 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -337,14 +318,9 @@ out:
 		if (!fatal)
 			fatal = err;
 	} else {
-		ext4_error(sb, "bit already cleared for inode %lu", ino);
-		if (gdp && !EXT4_MB_GRP_IBITMAP_CORRUPT(grp)) {
-			int count;
-			count = ext4_free_inodes_count(sb, gdp);
-			percpu_counter_sub(&sbi->s_freeinodes_counter,
-					   count);
-		}
-		set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &grp->bb_state);
+		ext4_corrupted_block_group(sb, block_group,
+				EXT4_GROUP_INFO_IBITMAP_CORRUPT,
+				"bit already cleared for inode %lu", ino);
 	}
 
 error_return:
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 7282d07..e6805e6 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -752,10 +752,18 @@ int ext4_mb_generate_buddy(struct super_block *sb,
 	if (free != grp->bb_free) {
 		struct ext4_group_desc *gdp;
 		gdp = ext4_get_group_desc(sb, group, NULL);
-		ext4_error(sb, "group %lu: %u blocks in bitmap, %u in bb, "
-			"%u in gd, %lu pa's\n", (long unsigned int)group,
-			free, grp->bb_free, ext4_free_group_clusters(sb, gdp),
-			grp->bb_prealloc_nr);
+
+		ext4_corrupted_block_group(sb, group,
+				EXT4_GROUP_INFO_BBITMAP_CORRUPT,
+				"group %lu: %u blocks in bitmap, %u in bb, %u in gd, %lu pa's block bitmap corrupt",
+				(unsigned long int)group, free, grp->bb_free,
+				ext4_free_group_clusters(sb, gdp),
+				grp->bb_prealloc_nr);
+		/*
+		 * If we intend to continue, we consider group descriptor
+		 * corrupt and update bb_free using bitmap value
+		 */
+		grp->bb_free = free;
 		return -EIO;
 	}
 	mb_set_largest_free_order(sb, grp);
@@ -1101,7 +1109,7 @@ ext4_mb_load_buddy(struct super_block *sb, ext4_group_t group,
 	int block;
 	int pnum;
 	int poff;
-	struct page *page;
+	struct page *page = NULL;
 	int ret;
 	struct ext4_group_info *grp;
 	struct ext4_sb_info *sbi = EXT4_SB(sb);
@@ -1127,7 +1135,7 @@ ext4_mb_load_buddy(struct super_block *sb, ext4_group_t group,
 		 */
 		ret = ext4_mb_init_group(sb, group);
 		if (ret)
-			return ret;
+			goto err;
 	}
 
 	/*
@@ -1227,6 +1235,7 @@ err:
 		page_cache_release(e4b->bd_buddy_page);
 	e4b->bd_buddy = NULL;
 	e4b->bd_bitmap = NULL;
+	ext4_warning(sb, "Error loading buddy information for %u", group);
 	return ret;
 }
 
@@ -3599,9 +3608,11 @@ int ext4_mb_check_ondisk_bitmap(struct super_block *sb, void *bitmap,
 	}
 
 	if (free != free_in_gdp) {
-		ext4_error(sb, "on-disk bitmap for group %d"
-			"corrupted: %u blocks free in bitmap, %u - in gd\n",
-			group, free, free_in_gdp);
+		ext4_corrupted_block_group(sb, group,
+				EXT4_GROUP_INFO_BBITMAP_CORRUPT,
+				"on-disk bitmap for group %d corrupted: %u blocks free in bitmap, %u - in gd\n",
+				group, free,
+				free_in_gdp);
 		return -EIO;
 	}
 	return 0;
@@ -3962,16 +3973,8 @@ ext4_mb_release_inode_pa(struct ext4_buddy *e4b, struct buffer_head *bitmap_bh,
 	/* "free < pa->pa_free" means we maybe double alloc the same blocks,
 	 * otherwise maybe leave some free blocks unavailable, no need to BUG.*/
 	if ((free > pa->pa_free && !pa->pa_error) || (free < pa->pa_free)) {
-		ext4_error(sb, "pa free mismatch: [pa %p] "
-				"[phy %lu] [logic %lu] [len %u] [free %u] "
-				"[error %u] [inode %lu] [freed %u]", pa,
-				(unsigned long)pa->pa_pstart,
-				(unsigned long)pa->pa_lstart,
-				(unsigned)pa->pa_len, (unsigned)pa->pa_free,
-				(unsigned)pa->pa_error, pa->pa_inode->i_ino,
-				free);
 		ext4_grp_locked_error(sb, group, 0, 0, "free %u, pa_free %u",
-					free, pa->pa_free);
+				      free, pa->pa_free);
 		/*
 		 * pa is already deleted so we use the value obtained
 		 * from the bitmap and continue.
@@ -4031,15 +4034,11 @@ ext4_mb_discard_group_preallocations(struct super_block *sb,
 	bitmap_bh = ext4_read_block_bitmap(sb, group);
	if (IS_ERR(bitmap_bh)) {
		err = PTR_ERR(bitmap_bh);
-		ext4_error(sb, "Error %d reading block bitmap for %u",
-			   err, group);
 		return 0;
 	}
 
 	err = ext4_mb_load_buddy(sb, group, &e4b);
 	if (err) {
-		ext4_warning(sb, "Error %d loading buddy information for %u",
-			     err, group);
 		put_bh(bitmap_bh);
 		return 0;
 	}
@@ -4198,17 +4198,12 @@ repeat:
 
		err = ext4_mb_load_buddy_gfp(sb, group, &e4b,
					     GFP_NOFS|__GFP_NOFAIL);
-		if (err) {
-			ext4_error(sb, "Error %d loading buddy information for %u",
-				   err, group);
+		if (err)
 			return;
-		}
 
 		bitmap_bh = ext4_read_block_bitmap(sb, group);
		if (IS_ERR(bitmap_bh)) {
			err = PTR_ERR(bitmap_bh);
-			ext4_error(sb, "Error %d reading block bitmap for %u",
-					err, group);
 			ext4_mb_unload_buddy(&e4b);
 			continue;
 		}
@@ -4467,11 +4462,8 @@ ext4_mb_discard_lg_preallocations(struct super_block *sb,
 
		err = ext4_mb_load_buddy_gfp(sb, group, &e4b,
					     GFP_NOFS|__GFP_NOFAIL);
-		if (err) {
-			ext4_error(sb, "Error %d loading buddy information for %u",
-				   err, group);
+		if (err)
 			continue;
-		}
 		ext4_lock_group(sb, group);
 		list_del(&pa->pa_group_list);
 		ext4_get_group_info(sb, group)->bb_prealloc_nr--;
@@ -4742,17 +4734,18 @@ errout:
 			 * been updated or not when fail case. So can
 			 * not revert pa_free back, just mark pa_error*/
 			pa->pa_error++;
-			ext4_error(sb,
-				"Updating bitmap error: [err %d] "
-				"[pa %p] [phy %lu] [logic %lu] "
-				"[len %u] [free %u] [error %u] "
-				"[inode %lu]", *errp, pa,
-				(unsigned long)pa->pa_pstart,
-				(unsigned long)pa->pa_lstart,
-				(unsigned)pa->pa_len,
-				(unsigned)pa->pa_free,
-				(unsigned)pa->pa_error,
-				pa->pa_inode ? pa->pa_inode->i_ino : 0);
+			ext4_corrupted_block_group(sb, 0, 0,
+					"Updating bitmap error: [err %d] "
+					"[pa %p] [phy %lu] [logic %lu] "
+					"[len %u] [free %u] [error %u] "
+					"[inode %lu]", *errp, pa,
+					(unsigned long)pa->pa_pstart,
+					(unsigned long)pa->pa_lstart,
+					(unsigned)pa->pa_len,
+					(unsigned)pa->pa_free,
+					(unsigned)pa->pa_error,
+					pa->pa_inode ?
+					pa->pa_inode->i_ino : 0);
 		}
 	}
 	ext4_mb_release_context(ac);
@@ -5037,7 +5030,7 @@ do_more:
 
 	err = ext4_mb_load_buddy(sb, block_group, &e4b);
 	if (err)
-		goto error_return;
+		goto error_brelse;
 
 	if ((flags & EXT4_FREE_BLOCKS_METADATA) && ext4_handle_valid(handle)) {
 		struct ext4_free_data *new_entry;
@@ -5119,8 +5112,9 @@ do_more:
 		goto do_more;
 	}
 error_return:
-	brelse(bitmap_bh);
 	ext4_std_error(sb, err);
+error_brelse:
+	brelse(bitmap_bh);
 	return;
 }
 
@@ -5216,7 +5210,7 @@ int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
 
 	err = ext4_mb_load_buddy(sb, block_group, &e4b);
 	if (err)
-		goto error_return;
+		goto error_brelse;
 
 	/*
 	 * need to update group_info->bb_free and bitmap
@@ -5253,8 +5247,9 @@ int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
 		err = ret;
 
 error_return:
-	brelse(bitmap_bh);
 	ext4_std_error(sb, err);
+error_brelse:
+	brelse(bitmap_bh);
 	return err;
 }
 
@@ -5329,11 +5324,9 @@ ext4_trim_all_free(struct super_block *sb, ext4_group_t group,
 	trace_ext4_trim_all_free(sb, group, start, max);
 
 	ret = ext4_mb_load_buddy(sb, group, &e4b);
-	if (ret) {
-		ext4_warning(sb, "Error %d loading buddy information for %u",
-			     ret, group);
+	if (ret)
 		return ret;
-	}
+
 	bitmap = e4b.bd_bitmap;
 
 	ext4_lock_group(sb, group);
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index c625960..0de22f2 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -633,6 +633,37 @@ void __ext4_warning(struct super_block *sb, const char *function,
 	va_end(args);
 }
 
+void __ext4_corrupted_block_group(struct super_block *sb, ext4_group_t group,
+				  unsigned int flags, const char *function,
+				  unsigned int line)
+{
+	struct ext4_sb_info *sbi = EXT4_SB(sb);
+	struct ext4_group_info *grp = ext4_get_group_info(sb, group);
+	struct ext4_group_desc *gdp = ext4_get_group_desc(sb, group, NULL);
+
+	if (flags & EXT4_GROUP_INFO_BBITMAP_CORRUPT &&
+	    !EXT4_MB_GRP_BBITMAP_CORRUPT(grp)) {
+		percpu_counter_sub(&sbi->s_freeclusters_counter,
+					grp->bb_free);
+		set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT,
+			&grp->bb_state);
+	}
+
+	if (flags & EXT4_GROUP_INFO_IBITMAP_CORRUPT &&
+	    !EXT4_MB_GRP_IBITMAP_CORRUPT(grp)) {
+		if (gdp) {
+			int count;
+
+			count = ext4_free_inodes_count(sb, gdp);
+			percpu_counter_sub(&sbi->s_freeinodes_counter,
+					   count);
+		}
+		set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT,
+			&grp->bb_state);
+	}
+	save_error_info(sb, function, line);
+}
+
 void __ext4_grp_locked_error(const char *function, unsigned int line,
 			     struct super_block *sb, ext4_group_t grp,
 			     unsigned long ino, ext4_fsblk_t block,