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Subject[PATCH v3 1/2] f2fs-dev: support multi-device direct IO
Date
From: Qiuyang Sun <sunqiuyang@huawei.com>

Changelog v1 ==> v2:
1. Modify the definition of update_device_state(),
and call it in direct write;
2. Move some local variables into branches where they are used.

Changelog v2 ==> v3:
Rename update_device_state() to f2fs_update_device_state() like other
exported function names, otherwise it may pollute global namespace of
functions in kernel.

Signed-off-by: Qiuyang Sun <sunqiuyang@huawei.com>
---
fs/f2fs/data.c | 25 ++++++++++++++++++++++++-
fs/f2fs/f2fs.h | 4 ++--
fs/f2fs/segment.c | 12 ++++++------
3 files changed, 32 insertions(+), 9 deletions(-)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index e5cd3fd..b35e042 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -1076,6 +1076,7 @@ int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map,
struct extent_info ei = {0,0,0};
block_t blkaddr;
unsigned int start_pgofs;
+ block_t end_blk;

if (!maxblocks)
return 0;
@@ -1207,8 +1208,17 @@ int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map,

map->m_pblk = blkaddr;
map->m_len = 1;
+
+ if (sbi->s_ndevs && blkaddr != NEW_ADDR &&
+ blkaddr != NULL_ADDR) {
+ int devi;
+
+ devi = f2fs_target_device_index(sbi, blkaddr);
+ end_blk = FDEV(devi).end_blk;
+ }
} else if ((map->m_pblk != NEW_ADDR &&
- blkaddr == (map->m_pblk + ofs)) ||
+ blkaddr == (map->m_pblk + ofs) &&
+ (!sbi->s_ndevs || blkaddr <= end_blk)) ||
(map->m_pblk == NEW_ADDR && blkaddr == NEW_ADDR) ||
flag == F2FS_GET_BLOCK_PRE_DIO) {
ofs++;
@@ -1322,6 +1332,7 @@ static int __get_data_block(struct inode *inode, sector_t iblock,
{
struct f2fs_map_blocks map;
int err;
+ struct f2fs_sb_info *sbi = F2FS_I_SB(inode);

map.m_lblk = iblock;
map.m_len = bh->b_size >> inode->i_blkbits;
@@ -1333,6 +1344,18 @@ static int __get_data_block(struct inode *inode, sector_t iblock,
err = f2fs_map_blocks(inode, &map, create, flag);
if (!err) {
map_bh(bh, inode->i_sb, map.m_pblk);
+ if (sbi->s_ndevs) {
+ int devi;
+
+ devi = f2fs_target_device_index(sbi, map.m_pblk);
+ if (devi) {
+ bh->b_bdev = FDEV(devi).bdev;
+ bh->b_blocknr -= FDEV(devi).start_blk;
+ }
+ if (may_write)
+ f2fs_update_device_state(sbi, inode->i_ino,
+ map.m_pblk);
+ }
bh->b_state = (bh->b_state & ~F2FS_MAP_FLAGS) | map.m_flags;
bh->b_size = (u64)map.m_len << inode->i_blkbits;
}
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index eeede26..7e423e4 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -3056,6 +3056,8 @@ int f2fs_lookup_journal_in_cursum(struct f2fs_journal *journal, int type,
int f2fs_rw_hint_to_seg_type(enum rw_hint hint);
enum rw_hint f2fs_io_type_to_rw_hint(struct f2fs_sb_info *sbi,
enum page_type type, enum temp_type temp);
+void f2fs_update_device_state(struct f2fs_sb_info *sbi, nid_t ino,
+ block_t blkaddr);

/*
* checkpoint.c
@@ -3595,8 +3597,6 @@ static inline bool f2fs_force_buffered_io(struct inode *inode,

if (f2fs_post_read_required(inode))
return true;
- if (sbi->s_ndevs)
- return true;
/*
* for blkzoned device, fallback direct IO to buffered IO, so
* all IOs can be serialized by log-structured write.
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index a361d61..2a21d87 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -3050,18 +3050,18 @@ void f2fs_allocate_data_block(struct f2fs_sb_info *sbi, struct page *page,
up_read(&SM_I(sbi)->curseg_lock);
}

-static void update_device_state(struct f2fs_io_info *fio)
+void f2fs_update_device_state(struct f2fs_sb_info *sbi, nid_t ino,
+ block_t blkaddr)
{
- struct f2fs_sb_info *sbi = fio->sbi;
unsigned int devidx;

if (!sbi->s_ndevs)
return;

- devidx = f2fs_target_device_index(sbi, fio->new_blkaddr);
+ devidx = f2fs_target_device_index(sbi, blkaddr);

/* update device state for fsync */
- f2fs_set_dirty_device(sbi, fio->ino, devidx, FLUSH_INO);
+ f2fs_set_dirty_device(sbi, ino, devidx, FLUSH_INO);

/* update device state for checkpoint */
if (!f2fs_test_bit(devidx, (char *)&sbi->dirty_device)) {
@@ -3092,7 +3092,7 @@ static void do_write_page(struct f2fs_summary *sum, struct f2fs_io_info *fio)
goto reallocate;
}

- update_device_state(fio);
+ f2fs_update_device_state(fio->sbi, fio->ino, fio->new_blkaddr);

if (keep_order)
up_read(&fio->sbi->io_order_lock);
@@ -3168,7 +3168,7 @@ int f2fs_inplace_write_data(struct f2fs_io_info *fio)
else
err = f2fs_submit_page_bio(fio);
if (!err)
- update_device_state(fio);
+ f2fs_update_device_state(fio->sbi, fio->ino, fio->new_blkaddr);

f2fs_update_iostat(fio->sbi, fio->io_type, F2FS_BLKSIZE);

--
1.8.3.1
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