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authorZhang Yi <yi.zhang@huawei.com>2024-01-27 04:58:04 +0300
committerTheodore Ts'o <tytso@mit.edu>2024-02-02 07:59:21 +0300
commit874eaba96d39334fe9c729ff631e65523616d4d8 (patch)
tree401e4a6a4340ae92b68473fb2f02a34a63f5829f
parent9f1118223aa080021fe9751fa221590654d27669 (diff)
downloadlinux-874eaba96d39334fe9c729ff631e65523616d4d8.tar.xz
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>
-rw-r--r--fs/ext4/ext4.h4
-rw-r--r--fs/ext4/extents.c7
-rw-r--r--fs/ext4/inode.c2
3 files changed, 10 insertions, 3 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 786b6857ab47..023571f8dd1b 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 c5b54fb9eb8b..7669d154c05e 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 af205b416794..60f0d2dc1c37 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;