v2->v3: - Rename ext4_ext_determine_hole() to ext4_ext_determine_insert_hole() and keep setting of 'map' inside ext4_ext_map_blocks(). - Don't set EXT4_MAP_DELAYED in ext4_ext_determine_insert_hole() because it's unreliable, and revise the comments. v1->v2: - Fix a long standing race issue between determine hole and inserting new delalloc extent analyzed by Jan Kara. - Change method of adjusting hole length, instead of skip holes in ext4_map_blocks(), now we find delalloc and correct length and type in ext4_ext_determine_hole(). v2: https://lore.kernel.org/linux-ext4/20231223110223.3650717-1-yi.zhang@xxxxxxxxxxxxxxx/ v1: https://lore.kernel.org/linux-ext4/20231121093429.1827390-1-yi.zhang@xxxxxxxxxxxxxxx/ Hello, all! I'm working on switching ext4 buffer IO from buffer_head to iomap and enable large folio on regular file recently [1], this patch set is one of a preparation of this work. It first fix a long standing race issue between bmap querying and adding new delalloc extents, then correct the hole length returned by ext4_map_blocks() when user querying map type and blocks range, after that, make this function and ext4_set_iomap() are able to distinguish delayed allocated only mapping from hole, finally BTW cleanup the ext4_iomap_begin_report(). This preparation patch set changes the ext4 map -> iomap converting logic in ext4_set_iomap(), so that the later buffer IO conversion can use this helper to connect iomap frame. This patch set is already passed 'kvm-xfstests -g auto' tests. Thanks, Yi. [1] https://lore.kernel.org/linux-ext4/20240102123918.799062-1-yi.zhang@xxxxxxxxxxxxxxx/ Zhang Yi (6): ext4: refactor ext4_da_map_blocks() ext4: convert to exclusive lock while inserting delalloc extents ext4: correct the hole length returned by ext4_map_blocks() ext4: add a hole extent entry in cache after punch ext4: make ext4_map_blocks() distinguish delalloc only extent ext4: make ext4_set_iomap() recognize IOMAP_DELALLOC map type fs/ext4/ext4.h | 4 +- fs/ext4/extents.c | 114 +++++++++++++++++++++++++++++----------------- fs/ext4/inode.c | 84 +++++++++++----------------------- 3 files changed, 103 insertions(+), 99 deletions(-) -- 2.39.2
