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Date:   Thu, 22 Jul 2021 14:19:21 -0700
From:   Daeho Jeong <daeho43@...il.com>
To:     linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, kernel-team@...roid.com
Cc:     Daeho Jeong <daehojeong@...gle.com>
Subject: [PATCH v2] f2fs: change fiemap way in printing compression chunk

From: Daeho Jeong <daehojeong@...gle.com>

When we print out a discontinuous compression chunk, it shows like a
continuous chunk now. To show it more correctly, I've changed the way of
printing fiemap info like below. Plus, eliminated NEW_ADDR(-1) in fiemap
info, since it is not in fiemap user api manual.

   Logical          Physical         Length           Flags
0: 0000000000000000 0000000fdf692000 0000000000004000 1008
1: 0000000000004000 0000000fdf693000 0000000000004000 1008
2: 0000000000008000 0000000fdf694000 0000000000004000 1008
3: 000000000000c000 0000000fdf695000 0000000000004000 1008
4: 0000000000010000 0000000fdf696000 000000000000c000 1000
5: 000000000001c000 0000000f8c60d000 0000000000010000 1000
6: 000000000002c000 0000000f8c61d000 0000000000004000 1008
7: 0000000000030000 0000000f8c620000 0000000000004000 1008
8: 0000000000034000 0000000f8c623000 0000000000001000 1008
9: 0000000000035000 0000000fc7af4000 0000000000003000 1008

Flags
0x1000 => FIEMAP_EXTENT_MERGED
0x0008 => FIEMAP_EXTENT_ENCODED

Signed-off-by: Daeho Jeong <daehojeong@...gle.com>

---
v2: changed the print format
---
 fs/f2fs/data.c | 76 ++++++++++++++++++++++++++++----------------------
 1 file changed, 42 insertions(+), 34 deletions(-)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 3a01a1b50104..058dc751e3a6 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -1843,8 +1843,9 @@ int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 	u64 logical = 0, phys = 0, size = 0;
 	u32 flags = 0;
 	int ret = 0;
-	bool compr_cluster = false;
+	bool compr_cluster = false, compr_appended;
 	unsigned int cluster_size = F2FS_I(inode)->i_cluster_size;
+	unsigned int count_in_cluster;
 	loff_t maxbytes;
 
 	if (fieinfo->fi_flags & FIEMAP_FLAG_CACHE) {
@@ -1892,8 +1893,10 @@ int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 	map.m_next_pgofs = &next_pgofs;
 	map.m_seg_type = NO_CHECK_TYPE;
 
-	if (compr_cluster)
-		map.m_len = cluster_size - 1;
+	if (compr_cluster) {
+		map.m_lblk += 1;
+		map.m_len = cluster_size - count_in_cluster;
+	}
 
 	ret = f2fs_map_blocks(inode, &map, 0, F2FS_GET_BLOCK_FIEMAP);
 	if (ret)
@@ -1903,11 +1906,23 @@ int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 	if (!(map.m_flags & F2FS_MAP_FLAGS)) {
 		start_blk = next_pgofs;
 
-		if (blks_to_bytes(inode, start_blk) < blks_to_bytes(inode,
+		if (blks_to_bytes(inode, start_blk) >= blks_to_bytes(inode,
 						max_inode_blocks(inode)))
+			flags |= FIEMAP_EXTENT_LAST;
+		else if (!compr_cluster)
 			goto prep_next;
+	}
+
+	compr_appended = false;
+	/* In a case of compressed cluster, append this to the last extent */
+	if (compr_cluster && ((map.m_flags & F2FS_MAP_UNWRITTEN) ||
+			!(map.m_flags & F2FS_MAP_FLAGS))) {
+		unsigned int appended_blks = cluster_size - count_in_cluster + 1;
 
-		flags |= FIEMAP_EXTENT_LAST;
+		size += blks_to_bytes(inode, appended_blks);
+		if (map.m_flags & F2FS_MAP_UNWRITTEN)
+			start_blk += appended_blks;
+		compr_appended = true;
 	}
 
 	if (size) {
@@ -1926,38 +1941,31 @@ int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 	if (start_blk > last_blk)
 		goto out;
 
-	if (compr_cluster) {
-		compr_cluster = false;
-
-
-		logical = blks_to_bytes(inode, start_blk - 1);
-		phys = blks_to_bytes(inode, map.m_pblk);
-		size = blks_to_bytes(inode, cluster_size);
-
-		flags |= FIEMAP_EXTENT_ENCODED;
-
-		start_blk += cluster_size - 1;
-
-		if (start_blk > last_blk)
-			goto out;
-
-		goto prep_next;
-	}
-
 	if (map.m_pblk == COMPRESS_ADDR) {
 		compr_cluster = true;
-		start_blk++;
-		goto prep_next;
-	}
-
-	logical = blks_to_bytes(inode, start_blk);
-	phys = blks_to_bytes(inode, map.m_pblk);
-	size = blks_to_bytes(inode, map.m_len);
-	flags = 0;
-	if (map.m_flags & F2FS_MAP_UNWRITTEN)
-		flags = FIEMAP_EXTENT_UNWRITTEN;
+		count_in_cluster = 1;
+	} else if (compr_appended) {
+		compr_cluster = false;
+	} else {
+		logical = blks_to_bytes(inode, start_blk);
+		phys = __is_valid_data_blkaddr(map.m_pblk) ?
+			blks_to_bytes(inode, map.m_pblk) : 0;
+		size = blks_to_bytes(inode, map.m_len);
+		flags = 0;
+
+		if (compr_cluster) {
+			flags = FIEMAP_EXTENT_ENCODED;
+			count_in_cluster += map.m_len;
+			if (count_in_cluster == cluster_size) {
+				compr_cluster = false;
+				size += blks_to_bytes(inode, 1);
+			}
+		} else if (map.m_flags & F2FS_MAP_UNWRITTEN) {
+			flags = FIEMAP_EXTENT_UNWRITTEN;
+		}
 
-	start_blk += bytes_to_blks(inode, size);
+		start_blk += bytes_to_blks(inode, size);
+	}
 
 prep_next:
 	cond_resched();
-- 
2.32.0.432.gabb21c7263-goog

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