[PATCH 07/10] ext4: refactor ext4_insert_range()

[Zhang Yi <yi.zhang@huaweicloud.com>]

From: Zhang Yi <yi.zhang@huawei.com>

Simplify ext4_collapse_range() and make the code style the same as
ext4_collapse_range(), refactor it by a) rename variables, b) drop
redundant input parameters checking, move others to under i_rwsem,
preparing for later refactor, c) rename the three stale error tags.

Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
---
 fs/ext4/extents.c | 95 ++++++++++++++++++++++-------------------------
 1 file changed, 45 insertions(+), 50 deletions(-)

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 5c0b4d512531..a6c24c229cb4 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -5391,45 +5391,37 @@ static int ext4_insert_range(struct file *file, loff_t offset, loff_t len)
 	handle_t *handle;
 	struct ext4_ext_path *path;
 	struct ext4_extent *extent;
-	ext4_lblk_t offset_lblk, len_lblk, ee_start_lblk = 0;
+	ext4_lblk_t start_lblk, len_lblk, ee_start_lblk = 0;
 	unsigned int credits, ee_len;
-	int ret = 0, depth, split_flag = 0;
-	loff_t ioffset;
-
-	/*
-	 * We need to test this early because xfstests assumes that an
-	 * insert range of (0, 1) will return EOPNOTSUPP if the file
-	 * system does not support insert range.
-	 */
-	if (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
-		return -EOPNOTSUPP;
-
-	/* Insert range works only on fs cluster size aligned regions. */
-	if (!IS_ALIGNED(offset | len, EXT4_CLUSTER_SIZE(sb)))
-		return -EINVAL;
+	int ret, depth, split_flag = 0;
+	loff_t start;
 
 	trace_ext4_insert_range(inode, offset, len);
 
-	offset_lblk = offset >> EXT4_BLOCK_SIZE_BITS(sb);
-	len_lblk = len >> EXT4_BLOCK_SIZE_BITS(sb);
-
 	inode_lock(inode);
+
 	/* Currently just for extent based files */
 	if (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) {
 		ret = -EOPNOTSUPP;
-		goto out_mutex;
+		goto out;
 	}
 
-	/* Check whether the maximum file size would be exceeded */
-	if (len > inode->i_sb->s_maxbytes - inode->i_size) {
-		ret = -EFBIG;
-		goto out_mutex;
+	/* Insert range works only on fs cluster size aligned regions. */
+	if (!IS_ALIGNED(offset | len, EXT4_CLUSTER_SIZE(sb))) {
+		ret = -EINVAL;
+		goto out;
 	}
 
 	/* Offset must be less than i_size */
 	if (offset >= inode->i_size) {
 		ret = -EINVAL;
-		goto out_mutex;
+		goto out;
+	}
+
+	/* Check whether the maximum file size would be exceeded */
+	if (len > inode->i_sb->s_maxbytes - inode->i_size) {
+		ret = -EFBIG;
+		goto out;
 	}
 
 	/* Wait for existing dio to complete */
@@ -5437,7 +5429,7 @@ static int ext4_insert_range(struct file *file, loff_t offset, loff_t len)
 
 	ret = file_modified(file);
 	if (ret)
-		goto out_mutex;
+		goto out;
 
 	/*
 	 * Prevent page faults from reinstantiating pages we have released from
@@ -5447,25 +5439,24 @@ static int ext4_insert_range(struct file *file, loff_t offset, loff_t len)
 
 	ret = ext4_break_layouts(inode);
 	if (ret)
-		goto out_mmap;
+		goto out_invalidate_lock;
 
 	/*
 	 * Need to round down to align start offset to page size boundary
 	 * for page size > block size.
 	 */
-	ioffset = round_down(offset, PAGE_SIZE);
+	start = round_down(offset, PAGE_SIZE);
 	/* Write out all dirty pages */
-	ret = filemap_write_and_wait_range(inode->i_mapping, ioffset,
-			LLONG_MAX);
+	ret = filemap_write_and_wait_range(mapping, start, LLONG_MAX);
 	if (ret)
-		goto out_mmap;
-	truncate_pagecache(inode, ioffset);
+		goto out_invalidate_lock;
+	truncate_pagecache(inode, start);
 
 	credits = ext4_writepage_trans_blocks(inode);
 	handle = ext4_journal_start(inode, EXT4_HT_TRUNCATE, credits);
 	if (IS_ERR(handle)) {
 		ret = PTR_ERR(handle);
-		goto out_mmap;
+		goto out_invalidate_lock;
 	}
 	ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_FALLOC_RANGE, handle);
 
@@ -5474,15 +5465,18 @@ static int ext4_insert_range(struct file *file, loff_t offset, loff_t len)
 	EXT4_I(inode)->i_disksize += len;
 	ret = ext4_mark_inode_dirty(handle, inode);
 	if (ret)
-		goto out_stop;
+		goto out_handle;
+
+	start_lblk = offset >> inode->i_blkbits;
+	len_lblk = len >> inode->i_blkbits;
 
 	down_write(&EXT4_I(inode)->i_data_sem);
 	ext4_discard_preallocations(inode);
 
-	path = ext4_find_extent(inode, offset_lblk, NULL, 0);
+	path = ext4_find_extent(inode, start_lblk, NULL, 0);
 	if (IS_ERR(path)) {
 		up_write(&EXT4_I(inode)->i_data_sem);
-		goto out_stop;
+		goto out_handle;
 	}
 
 	depth = ext_depth(inode);
@@ -5492,16 +5486,16 @@ static int ext4_insert_range(struct file *file, loff_t offset, loff_t len)
 		ee_len = ext4_ext_get_actual_len(extent);
 
 		/*
-		 * If offset_lblk is not the starting block of extent, split
-		 * the extent @offset_lblk
+		 * If start_lblk is not the starting block of extent, split
+		 * the extent @start_lblk
 		 */
-		if ((offset_lblk > ee_start_lblk) &&
-				(offset_lblk < (ee_start_lblk + ee_len))) {
+		if ((start_lblk > ee_start_lblk) &&
+				(start_lblk < (ee_start_lblk + ee_len))) {
 			if (ext4_ext_is_unwritten(extent))
 				split_flag = EXT4_EXT_MARK_UNWRIT1 |
 					EXT4_EXT_MARK_UNWRIT2;
 			ret = ext4_split_extent_at(handle, inode, &path,
-					offset_lblk, split_flag,
+					start_lblk, split_flag,
 					EXT4_EX_NOCACHE |
 					EXT4_GET_BLOCKS_PRE_IO |
 					EXT4_GET_BLOCKS_METADATA_NOFAIL);
@@ -5510,32 +5504,33 @@ static int ext4_insert_range(struct file *file, loff_t offset, loff_t len)
 		ext4_free_ext_path(path);
 		if (ret < 0) {
 			up_write(&EXT4_I(inode)->i_data_sem);
-			goto out_stop;
+			goto out_handle;
 		}
 	} else {
 		ext4_free_ext_path(path);
 	}
 
-	ext4_es_remove_extent(inode, offset_lblk, EXT_MAX_BLOCKS - offset_lblk);
+	ext4_es_remove_extent(inode, start_lblk, EXT_MAX_BLOCKS - start_lblk);
 
 	/*
-	 * if offset_lblk lies in a hole which is at start of file, use
+	 * if start_lblk lies in a hole which is at start of file, use
 	 * ee_start_lblk to shift extents
 	 */
 	ret = ext4_ext_shift_extents(inode, handle,
-		max(ee_start_lblk, offset_lblk), len_lblk, SHIFT_RIGHT);
-
+		max(ee_start_lblk, start_lblk), len_lblk, SHIFT_RIGHT);
 	up_write(&EXT4_I(inode)->i_data_sem);
+	if (ret)
+		goto out_handle;
+
+	ext4_update_inode_fsync_trans(handle, inode, 1);
 	if (IS_SYNC(inode))
 		ext4_handle_sync(handle);
-	if (ret >= 0)
-		ext4_update_inode_fsync_trans(handle, inode, 1);
 
-out_stop:
+out_handle:
 	ext4_journal_stop(handle);
-out_mmap:
+out_invalidate_lock:
 	filemap_invalidate_unlock(mapping);
-out_mutex:
+out:
 	inode_unlock(inode);
 	return ret;
 }
-- 
2.39.2