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UPSTREAM: f2fs: avoid unused block when dio write in LFS mode

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This patch addresses the problem that when using LFS mode, unused blocks
may occur in f2fs_map_blocks() during block allocation for dio writes.

If a new section is allocated during block allocation, it will not be
included in the map struct by map_is_mergeable() if the LBA of the
allocated block is not contiguous. However, the block already allocated
in this process will remain unused due to the LFS mode.

This patch avoids the possibility of unused blocks by escaping
f2fs_map_blocks() when allocating the last block in a section.

Change-Id: Ia41455c85502566c2e07a508c89963d55ec3fc0c
Signed-off-by: Daejun Park <daejun7.park@samsung.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
(cherry picked from commit 0638a3197c)
This commit is contained in:
Daejun Park 2024-09-05 14:24:33 +09:00 committed by Matthias Männich
parent 403c8bf1c7
commit b66647b69c
1 changed files with 8 additions and 0 deletions
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8
fs/f2fs/data.c
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@ -1718,6 +1718,14 @@ skip:
dn.ofs_in_node = end_offset;
}
if (flag == F2FS_GET_BLOCK_DIO && f2fs_lfs_mode(sbi) &&
map->m_may_create) {
/* the next block to be allocated may not be contiguous. */
if (GET_SEGOFF_FROM_SEG0(sbi, blkaddr) % BLKS_PER_SEC(sbi) ==
CAP_BLKS_PER_SEC(sbi) - 1)
goto sync_out;
}
if (pgofs >= end)
goto sync_out;
else if (dn.ofs_in_node < end_offset)