[PATCH v3 17/31] btrfs: reflink: make copy_inline_to_page() to be subpage compatible
From: Qu Wenruo <hidden>
Date: 2021-05-21 06:43:15
Subsystem:
btrfs file system, filesystems (vfs and infrastructure), the rest · Maintainers:
Chris Mason, David Sterba, Alexander Viro, Christian Brauner, Linus Torvalds
The modifications are: - Page copy destination For subpage case, one page can contain multiple sectors, thus we can no longer expect the memcpy_to_page()/btrfs_decompress() to copy data into page offset 0. The correct offset is offset_in_page(file_offset) now, which should handle both regular sectorsize and subpage cases well. - Page status update Now we need to use subpage helper to handle the page status update. Signed-off-by: Qu Wenruo <redacted> --- fs/btrfs/reflink.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-)
diff --git a/fs/btrfs/reflink.c b/fs/btrfs/reflink.c
index d434dc78dadf..a6e8b8e67c80 100644
--- a/fs/btrfs/reflink.c
+++ b/fs/btrfs/reflink.c@@ -7,6 +7,7 @@ #include "delalloc-space.h" #include "reflink.h" #include "transaction.h" +#include "subpage.h" #define BTRFS_MAX_DEDUPE_LEN SZ_16M
@@ -52,7 +53,8 @@ static int copy_inline_to_page(struct btrfs_inode *inode, const u64 datal, const u8 comp_type) { - const u64 block_size = btrfs_inode_sectorsize(inode); + struct btrfs_fs_info *fs_info = inode->root->fs_info; + const u32 block_size = fs_info->sectorsize; const u64 range_end = file_offset + block_size - 1; const size_t inline_size = size - btrfs_file_extent_calc_inline_size(0); char *data_start = inline_data + btrfs_file_extent_calc_inline_size(0);
@@ -106,10 +108,12 @@ static int copy_inline_to_page(struct btrfs_inode *inode, set_bit(BTRFS_INODE_NO_DELALLOC_FLUSH, &inode->runtime_flags); if (comp_type == BTRFS_COMPRESS_NONE) { - memcpy_to_page(page, 0, data_start, datal); + memcpy_to_page(page, offset_in_page(file_offset), data_start, + datal); flush_dcache_page(page); } else { - ret = btrfs_decompress(comp_type, data_start, page, 0, + ret = btrfs_decompress(comp_type, data_start, page, + offset_in_page(file_offset), inline_size, datal); if (ret) goto out_unlock;
@@ -133,9 +137,9 @@ static int copy_inline_to_page(struct btrfs_inode *inode, flush_dcache_page(page); } - SetPageUptodate(page); + btrfs_page_set_uptodate(fs_info, page, file_offset, block_size); ClearPageChecked(page); - set_page_dirty(page); + btrfs_page_set_dirty(fs_info, page, file_offset, block_size); out_unlock: if (page) { unlock_page(page);
--
2.31.1