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btrfs: merge PAGE_CLEAR_DIRTY and PAGE_SET_WRITEBACK to PAGE_START_WRITEBACK 

PAGE_CLEAR_DIRTY and PAGE_SET_WRITEBACK are two defines used in
__process_pages_contig(), to let the function know to clear page dirty
bit and then set page writeback.

However page writeback and dirty bits are conflicting (at least for
sector size == PAGE_SIZE case), this means these two have to be always
updated together.

This means we can merge PAGE_CLEAR_DIRTY and PAGE_SET_WRITEBACK to
PAGE_START_WRITEBACK.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2021-01-26 16:33:45 +08:00 committed by David Sterba
parent d0c2f4fa55
commit 6869b0a8be
3 changed files with 18 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
fs/btrfs/extent_io.c
View File

@ -1976,10 +1976,10 @@ static int __process_pages_contig(struct address_space *mapping,
pages_processed++;
continue;
}
if (page_ops & PAGE_CLEAR_DIRTY)
if (page_ops & PAGE_START_WRITEBACK) {
clear_page_dirty_for_io(pages[i]);
if (page_ops & PAGE_SET_WRITEBACK)
set_page_writeback(pages[i]);
}
if (page_ops & PAGE_SET_ERROR)
SetPageError(pages[i]);
if (page_ops & PAGE_END_WRITEBACK)

12
fs/btrfs/extent_io.h
View File

@ -35,12 +35,12 @@ enum {
/* these are flags for __process_pages_contig */
#define PAGE_UNLOCK (1 << 0)
#define PAGE_CLEAR_DIRTY (1 << 1)
#define PAGE_SET_WRITEBACK (1 << 2)
#define PAGE_END_WRITEBACK (1 << 3)
#define PAGE_SET_PRIVATE2 (1 << 4)
#define PAGE_SET_ERROR (1 << 5)
#define PAGE_LOCK (1 << 6)
/* Page starts writeback, clear dirty bit and set writeback bit */
#define PAGE_START_WRITEBACK (1 << 1)
#define PAGE_END_WRITEBACK (1 << 2)
#define PAGE_SET_PRIVATE2 (1 << 3)
#define PAGE_SET_ERROR (1 << 4)
#define PAGE_LOCK (1 << 5)
/*
* page->private values. Every page that is controlled by the extent

28
fs/btrfs/inode.c
View File

@ -692,8 +692,7 @@ static noinline int compress_file_range(struct async_chunk *async_chunk)
NULL,
clear_flags,
PAGE_UNLOCK |
PAGE_CLEAR_DIRTY |
PAGE_SET_WRITEBACK |
PAGE_START_WRITEBACK |
page_error_op |
PAGE_END_WRITEBACK);
@ -933,8 +932,7 @@ static noinline void submit_compressed_extents(struct async_chunk *async_chunk)
async_extent->start +
async_extent->ram_size - 1,
NULL, EXTENT_LOCKED | EXTENT_DELALLOC,
PAGE_UNLOCK | PAGE_CLEAR_DIRTY |
PAGE_SET_WRITEBACK);
PAGE_UNLOCK | PAGE_START_WRITEBACK);
if (btrfs_submit_compressed_write(inode, async_extent->start,
async_extent->ram_size,
ins.objectid,
@ -970,9 +968,8 @@ static noinline void submit_compressed_extents(struct async_chunk *async_chunk)
NULL, EXTENT_LOCKED | EXTENT_DELALLOC |
EXTENT_DELALLOC_NEW |
EXTENT_DEFRAG | EXTENT_DO_ACCOUNTING,
PAGE_UNLOCK | PAGE_CLEAR_DIRTY |
PAGE_SET_WRITEBACK | PAGE_END_WRITEBACK |
PAGE_SET_ERROR);
PAGE_UNLOCK | PAGE_START_WRITEBACK |
PAGE_END_WRITEBACK | PAGE_SET_ERROR);
free_async_extent_pages(async_extent);
kfree(async_extent);
goto again;
@ -1070,8 +1067,7 @@ static noinline int cow_file_range(struct btrfs_inode *inode,
EXTENT_LOCKED | EXTENT_DELALLOC |
EXTENT_DELALLOC_NEW | EXTENT_DEFRAG |
EXTENT_DO_ACCOUNTING, PAGE_UNLOCK |
PAGE_CLEAR_DIRTY | PAGE_SET_WRITEBACK |
PAGE_END_WRITEBACK);
PAGE_START_WRITEBACK | PAGE_END_WRITEBACK);
*nr_written = *nr_written +
(end - start + PAGE_SIZE) / PAGE_SIZE;
*page_started = 1;
@ -1194,8 +1190,7 @@ static noinline int cow_file_range(struct btrfs_inode *inode,
out_unlock:
clear_bits = EXTENT_LOCKED | EXTENT_DELALLOC | EXTENT_DELALLOC_NEW |
EXTENT_DEFRAG | EXTENT_CLEAR_META_RESV;
page_ops = PAGE_UNLOCK | PAGE_CLEAR_DIRTY | PAGE_SET_WRITEBACK |
PAGE_END_WRITEBACK;
page_ops = PAGE_UNLOCK | PAGE_START_WRITEBACK | PAGE_END_WRITEBACK;
/*
* If we reserved an extent for our delalloc range (or a subrange) and
* failed to create the respective ordered extent, then it means that
@ -1320,9 +1315,8 @@ static int cow_file_range_async(struct btrfs_inode *inode,
unsigned clear_bits = EXTENT_LOCKED | EXTENT_DELALLOC |
EXTENT_DELALLOC_NEW | EXTENT_DEFRAG |
EXTENT_DO_ACCOUNTING;
unsigned long page_ops = PAGE_UNLOCK | PAGE_CLEAR_DIRTY |
PAGE_SET_WRITEBACK | PAGE_END_WRITEBACK |
PAGE_SET_ERROR;
unsigned long page_ops = PAGE_UNLOCK | PAGE_START_WRITEBACK |
PAGE_END_WRITEBACK | PAGE_SET_ERROR;
extent_clear_unlock_delalloc(inode, start, end, locked_page,
clear_bits, page_ops);
@ -1519,8 +1513,7 @@ static noinline int run_delalloc_nocow(struct btrfs_inode *inode,
EXTENT_LOCKED | EXTENT_DELALLOC |
EXTENT_DO_ACCOUNTING |
EXTENT_DEFRAG, PAGE_UNLOCK |
PAGE_CLEAR_DIRTY |
PAGE_SET_WRITEBACK |
PAGE_START_WRITEBACK |
PAGE_END_WRITEBACK);
return -ENOMEM;
}
@ -1842,8 +1835,7 @@ static noinline int run_delalloc_nocow(struct btrfs_inode *inode,
locked_page, EXTENT_LOCKED |
EXTENT_DELALLOC | EXTENT_DEFRAG |
EXTENT_DO_ACCOUNTING, PAGE_UNLOCK |
PAGE_CLEAR_DIRTY |
PAGE_SET_WRITEBACK |
PAGE_START_WRITEBACK |
PAGE_END_WRITEBACK);
btrfs_free_path(path);
return ret;