From: Zhang Yi <yi.zhang@huawei.com>
Date: Sat, 27 Jan 2024 01:58:04 +0000 (+0800)
Subject: ext4: make ext4_map_blocks() distinguish delalloc only extent
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=874eaba96d39334fe9c729ff631e65523616d4d8;p=linux.git

ext4: make ext4_map_blocks() distinguish delalloc only extent

Add a new map flag EXT4_MAP_DELAYED to indicate the mapping range is a
delayed allocated only (not unwritten) one, and making
ext4_map_blocks() can distinguish it, no longer mixing it with holes.

Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20240127015825.1608160-6-yi.zhang@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
---

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 786b6857ab474..023571f8dd1b4 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -252,8 +252,10 @@ struct ext4_allocation_request {
 #define EXT4_MAP_MAPPED		BIT(BH_Mapped)
 #define EXT4_MAP_UNWRITTEN	BIT(BH_Unwritten)
 #define EXT4_MAP_BOUNDARY	BIT(BH_Boundary)
+#define EXT4_MAP_DELAYED	BIT(BH_Delay)
 #define EXT4_MAP_FLAGS		(EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
-				 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
+				 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\
+				 EXT4_MAP_DELAYED)
 
 struct ext4_map_blocks {
 	ext4_fsblk_t m_pblk;
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index c5b54fb9eb8bd..7669d154c05e0 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -4076,8 +4076,11 @@ again:
 		/*
 		 * The delalloc extent containing lblk, it must have been
 		 * added after ext4_map_blocks() checked the extent status
-		 * tree, adjust the length to the delalloc extent's after
-		 * lblk.
+		 * tree so we are not holding i_rwsem and delalloc info is
+		 * only stabilized by i_data_sem we are going to release
+		 * soon. Don't modify the extent status tree and report
+		 * extent as a hole, just adjust the length to the delalloc
+		 * extent's after lblk.
 		 */
 		len = es.es_lblk + es.es_len - lblk;
 		return len;
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index af205b416794d..60f0d2dc1c379 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -515,6 +515,8 @@ int ext4_map_blocks(handle_t *handle, struct inode *inode,
 			map->m_len = retval;
 		} else if (ext4_es_is_delayed(&es) || ext4_es_is_hole(&es)) {
 			map->m_pblk = 0;
+			map->m_flags |= ext4_es_is_delayed(&es) ?
+					EXT4_MAP_DELAYED : 0;
 			retval = es.es_len - (map->m_lblk - es.es_lblk);
 			if (retval > map->m_len)
 				retval = map->m_len;