[RFC 2/6] ext4: Implement ext4_group_block_valid() as common function

[Ritesh Harjani <riteshh@linux.ibm.com>]

This patch implements ext4_group_block_valid() check functionality,
and refactors all the callers to use this common function instead.

Signed-off-by: Ritesh Harjani <riteshh@linux.ibm.com>
---
 fs/ext4/block_validity.c | 31 +++++++++++++++++++++++++++++++
 fs/ext4/ext4.h           |  3 +++
 fs/ext4/mballoc.c        | 16 +++-------------
 3 files changed, 37 insertions(+), 13 deletions(-)

diff --git a/fs/ext4/block_validity.c b/fs/ext4/block_validity.c
index 4666b55b736e..01d822c664df 100644
--- a/fs/ext4/block_validity.c
+++ b/fs/ext4/block_validity.c
@@ -361,3 +361,34 @@ int ext4_check_blockref(const char *function, unsigned int line,
 	return 0;
 }
 
+/*
+ * ext4_group_block_valid - This checks if any of FS metadata blocks of a
+ * given group (@bg) lies in the given range [block, block + count - 1]
+ * or not.
+ *
+ * Return -
+ * - false if it does
+ * - else true
+ */
+bool ext4_group_block_valid(struct super_block *sb, ext4_group_t bg,
+			    ext4_fsblk_t block, unsigned int count)
+{
+	struct ext4_group_desc *gdp;
+	bool ret = true;
+
+	gdp = ext4_get_group_desc(sb, bg, NULL);
+	if (!gdp) {
+		ret = false;
+		goto out;
+	}
+
+	if (in_range(ext4_block_bitmap(sb, gdp), block, count) ||
+	    in_range(ext4_inode_bitmap(sb, gdp), block, count) ||
+	    in_range(block, ext4_inode_table(sb, gdp),
+		    EXT4_SB(sb)->s_itb_per_group) ||
+	    in_range(block + count - 1, ext4_inode_table(sb, gdp),
+		    EXT4_SB(sb)->s_itb_per_group))
+		ret = false;
+out:
+	return ret;
+}
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 18cd5b3b4815..fc7aa4b3e415 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -3706,6 +3706,9 @@ extern int ext4_inode_block_valid(struct inode *inode,
 				  unsigned int count);
 extern int ext4_check_blockref(const char *, unsigned int,
 			       struct inode *, __le32 *, unsigned int);
+extern bool ext4_group_block_valid(struct super_block *sb, ext4_group_t bg,
+				   ext4_fsblk_t block, unsigned int count);
+
 
 /* extents.c */
 struct ext4_ext_path;
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 8d23108cf9d7..60d32d3d8dc4 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -6001,13 +6001,7 @@ void ext4_free_blocks(handle_t *handle, struct inode *inode,
 		goto error_return;
 	}
 
-	if (in_range(ext4_block_bitmap(sb, gdp), block, count) ||
-	    in_range(ext4_inode_bitmap(sb, gdp), block, count) ||
-	    in_range(block, ext4_inode_table(sb, gdp),
-		     sbi->s_itb_per_group) ||
-	    in_range(block + count - 1, ext4_inode_table(sb, gdp),
-		     sbi->s_itb_per_group)) {
-
+	if (!ext4_group_block_valid(sb, block_group, block, count)) {
 		ext4_error(sb, "Freeing blocks in system zone - "
 			   "Block = %llu, count = %lu", block, count);
 		/* err = 0. ext4_std_error should be a no op */
@@ -6078,7 +6072,7 @@ void ext4_free_blocks(handle_t *handle, struct inode *inode,
 						 NULL);
 			if (err && err != -EOPNOTSUPP)
 				ext4_msg(sb, KERN_WARNING, "discard request in"
-					 " group:%d block:%d count:%lu failed"
+					 " group:%u block:%d count:%lu failed"
 					 " with %d", block_group, bit, count,
 					 err);
 		} else
@@ -6194,11 +6188,7 @@ int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
 		goto error_return;
 	}
 
-	if (in_range(ext4_block_bitmap(sb, desc), block, count) ||
-	    in_range(ext4_inode_bitmap(sb, desc), block, count) ||
-	    in_range(block, ext4_inode_table(sb, desc), sbi->s_itb_per_group) ||
-	    in_range(block + count - 1, ext4_inode_table(sb, desc),
-		     sbi->s_itb_per_group)) {
+	if (!ext4_group_block_valid(sb, block_group, block, count)) {
 		ext4_error(sb, "Adding blocks in system zones - "
 			   "Block = %llu, count = %lu",
 			   block, count);
-- 
2.31.1