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ext4: make ext4_map_blocks() distinguish delalloc only extent

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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>
This commit is contained in:
Zhang Yi 2024-01-27 09:58:04 +08:00 committed by Theodore Ts'o
parent 9f1118223a
commit 874eaba96d
3 changed files with 10 additions and 3 deletions
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4
fs/ext4/ext4.h
View File

@ -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;

7
fs/ext4/extents.c
View File

@ -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;

2
fs/ext4/inode.c
View File

@ -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;