[PATCH 6.11 004/214] fs/ntfs3: Optimize large writes into sparse file

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6.11-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Konstantin Komarov <almaz.alexandrovich@xxxxxxxxxxxxxxxxxxxx>

[ Upstream commit acdbd67bf939577d6f9e3cf796a005c31cec52d8 ]

Optimized cluster allocation by allocating a large chunk in advance
before writing, instead of allocating during the writing process
by clusters.
Essentially replicates the logic of fallocate.

Fixes: 4342306f0f0d ("fs/ntfs3: Add file operations and implementation")
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 fs/ntfs3/file.c | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/fs/ntfs3/file.c b/fs/ntfs3/file.c
index cddc51f9a93b2..d31eae611fe06 100644
--- a/fs/ntfs3/file.c
+++ b/fs/ntfs3/file.c
@@ -408,6 +408,42 @@ static int ntfs_extend(struct inode *inode, loff_t pos, size_t count,
 		err = 0;
 	}
 
+	if (file && is_sparsed(ni)) {
+		/*
+		 * This code optimizes large writes to sparse file.
+		 * TODO: merge this fragment with fallocate fragment.
+		 */
+		struct ntfs_sb_info *sbi = ni->mi.sbi;
+		CLST vcn = pos >> sbi->cluster_bits;
+		CLST cend = bytes_to_cluster(sbi, end);
+		CLST cend_v = bytes_to_cluster(sbi, ni->i_valid);
+		CLST lcn, clen;
+		bool new;
+
+		if (cend_v > cend)
+			cend_v = cend;
+
+		/*
+		 * Allocate and zero new clusters.
+		 * Zeroing these clusters may be too long.
+		 */
+		for (; vcn < cend_v; vcn += clen) {
+			err = attr_data_get_block(ni, vcn, cend_v - vcn, &lcn,
+						  &clen, &new, true);
+			if (err)
+				goto out;
+		}
+		/*
+		 * Allocate but not zero new clusters.
+		 */
+		for (; vcn < cend; vcn += clen) {
+			err = attr_data_get_block(ni, vcn, cend - vcn, &lcn,
+						  &clen, &new, false);
+			if (err)
+				goto out;
+		}
+	}
+
 	inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
 	mark_inode_dirty(inode);
 
-- 
2.43.0







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