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ext4: rename EXT4_GET_BLOCKS_PRE_IO

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This flag has been generalized to split an unwritten extent when we do
dio or dioread_nolock writeback, or to avoid merge new extents which was
created by extents split. Update some related comments too.

Reviewed-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Baokun Li <libaokun1@huawei.com>
Signed-off-by: Yang Erkun <yangerkun@huawei.com>
Message-ID: <20251112084538.1658232-2-yangerkun@huawei.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Yang Erkun
2025-11-12 16:45:36 +08:00
committed by Theodore Ts'o
parent d9ee3ff810
commit dac092195b
4 changed files with 25 additions and 16 deletions
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21
fs/ext4/ext4.h
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@@ -695,13 +695,22 @@ enum {
/* Caller is from the delayed allocation writeout path
* finally doing the actual allocation of delayed blocks */
#define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
/* caller is from the direct IO path, request to creation of an
unwritten extents if not allocated, split the unwritten
extent if blocks has been preallocated already*/
#define EXT4_GET_BLOCKS_PRE_IO 0x0008
#define EXT4_GET_BLOCKS_CONVERT 0x0010
#define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
/*
* This means that we cannot merge newly allocated extents, and if we
* found an unwritten extent, we need to split it.
*/
#define EXT4_GET_BLOCKS_SPLIT_NOMERGE 0x0008
/*
* Caller is from the dio or dioread_nolock buffered IO, reqest to
* create an unwritten extent if it does not exist or split the
* found unwritten extent. Also do not merge the newly created
* unwritten extent, io end will convert unwritten to written,
* and try to merge the written extent.
*/
#define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_SPLIT_NOMERGE|\
EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
/* Convert unwritten extent to initialized. */
#define EXT4_GET_BLOCKS_CONVERT 0x0010
/* Eventual metadata allocation (due to growing extent tree)
* should not fail, so try to use reserved blocks for that.*/
#define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020