Patch "fs/ntfs3: Optimize large writes into sparse file" has been added to the 6.11-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    fs/ntfs3: Optimize large writes into sparse file

to the 6.11-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     fs-ntfs3-optimize-large-writes-into-sparse-file.patch
and it can be found in the queue-6.11 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit ca7da917cd7ce38343c4c0512cca67f910908dc2
Author: Konstantin Komarov <almaz.alexandrovich@xxxxxxxxxxxxxxxxxxxx>
Date:   Fri Jun 28 18:27:46 2024 +0300

    fs/ntfs3: Optimize large writes into sparse file
    
    [ 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>

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);