From: Zheng Liu <wenqing.lz@xxxxxxxxxx>
This commit lets ext4_ext_map_blocks return EXT4_MAP_UNWRITTEN flag
because in later commit ext4_map_blocks needs to use this flag to
determine the extent status.
Signed-off-by: Zheng Liu <wenqing.lz@xxxxxxxxxx>
Cc: "Theodore Ts'o" <tytso@xxxxxxx>
Cc: Jan kara <jack@xxxxxxx>
---
fs/ext4/extents.c | 6 +++++-
fs/ext4/inode.c | 12 +++---------
2 files changed, 8 insertions(+), 10 deletions(-)
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index f7bf616..d92947f 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -3657,6 +3657,7 @@ ext4_ext_handle_uninitialized_extents(handle_t *handle, struct inode *inode,
ext4_set_io_unwritten_flag(inode, io);
else
ext4_set_inode_state(inode, EXT4_STATE_DIO_UNWRITTEN);
+ map->m_flags |= EXT4_MAP_UNWRITTEN;
if (ext4_should_dioread_nolock(inode))
map->m_flags |= EXT4_MAP_UNINIT;
goto out;
@@ -3678,8 +3679,10 @@ ext4_ext_handle_uninitialized_extents(handle_t *handle, struct inode *inode,
* repeat fallocate creation request
* we already have an unwritten extent
*/
- if (flags & EXT4_GET_BLOCKS_UNINIT_EXT)
+ if (flags & EXT4_GET_BLOCKS_UNINIT_EXT) {
+ map->m_flags |= EXT4_MAP_UNWRITTEN;
goto map_out;
+ }
/* buffered READ or buffered write_begin() lookup */
if ((flags & EXT4_GET_BLOCKS_CREATE) == 0) {
@@ -4109,6 +4112,7 @@ got_allocated_blocks:
/* Mark uninitialized */
if (flags & EXT4_GET_BLOCKS_UNINIT_EXT){
ext4_ext_mark_uninitialized(&newex);
+ map->m_flags |= EXT4_MAP_UNWRITTEN;
/*
* io_end structure was created for every IO write to an
* uninitialized extent. To avoid unnecessary conversion,
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 7fb00d8..c7e9665 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -560,16 +560,10 @@ int ext4_map_blocks(handle_t *handle, struct inode *inode,
return retval;
/*
- * When we call get_blocks without the create flag, the
- * BH_Unwritten flag could have gotten set if the blocks
- * requested were part of a uninitialized extent. We need to
- * clear this flag now that we are committed to convert all or
- * part of the uninitialized extent to be an initialized
- * extent. This is because we need to avoid the combination
- * of BH_Unwritten and BH_Mapped flags being simultaneously
- * set on the buffer_head.
+ * Here we clear m_flags because after allocating an new extent,
+ * it will be set again.
*/
- map->m_flags &= ~EXT4_MAP_UNWRITTEN;
+ map->m_flags &= ~EXT4_MAP_FLAGS;
/*
* New blocks allocate and/or writing to uninitialized extent
--
1.7.12.rc2.18.g61b472e
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