[PATCH 2/3] f2fs: remove unnecessary read cases in merged IO flow

From: Jaegeuk Kim
Date: Wed May 10 2017 - 19:48:32 EST

Merged IO flow doesn't need to care about read IOs.

f2fs_submit_merged_bio -> f2fs_submit_merged_write
f2fs_submit_merged_bios -> f2fs_submit_merged_writes
f2fs_submit_merged_bio_cond -> f2fs_submit_merged_write_cond

Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
---
fs/f2fs/checkpoint.c | 14 ++++++------
fs/f2fs/data.c | 55 ++++++++++++++++++++-------------------------
fs/f2fs/f2fs.h | 11 +++++----
fs/f2fs/gc.c | 6 ++---
fs/f2fs/node.c | 11 +++++----
fs/f2fs/segment.c | 11 +++++----
fs/f2fs/super.c | 2 +-
include/trace/events/f2fs.h | 2 +-
8 files changed, 51 insertions(+), 61 deletions(-)

diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index 8d92f8249000..13828f63a871 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -31,7 +31,7 @@ void f2fs_stop_checkpoint(struct f2fs_sb_info *sbi, bool end_io)
set_ckpt_flags(sbi, CP_ERROR_FLAG);
sbi->sb->s_flags |= MS_RDONLY;
if (!end_io)
- f2fs_flush_merged_bios(sbi);
+ f2fs_flush_merged_writes(sbi);
}

/*
@@ -247,13 +247,13 @@ static int f2fs_write_meta_page(struct page *page,
dec_page_count(sbi, F2FS_DIRTY_META);

if (wbc->for_reclaim)
- f2fs_submit_merged_bio_cond(sbi, page->mapping->host,
- 0, page->index, META, WRITE);
+ f2fs_submit_merged_write_cond(sbi, page->mapping->host,
+ 0, page->index, META);

unlock_page(page);

if (unlikely(f2fs_cp_error(sbi)))
- f2fs_submit_merged_bio(sbi, META, WRITE);
+ f2fs_submit_merged_write(sbi, META);

return 0;

@@ -356,7 +356,7 @@ long sync_meta_pages(struct f2fs_sb_info *sbi, enum page_type type,
}
stop:
if (nwritten)
- f2fs_submit_merged_bio(sbi, type, WRITE);
+ f2fs_submit_merged_write(sbi, type);

blk_finish_plug(&plug);

@@ -904,7 +904,7 @@ int sync_dirty_inodes(struct f2fs_sb_info *sbi, enum inode_type type)
* We should submit bio, since it exists several
* wribacking dentry pages in the freeing inode.
*/
- f2fs_submit_merged_bio(sbi, DATA, WRITE);
+ f2fs_submit_merged_write(sbi, DATA);
cond_resched();
}
goto retry;
@@ -1293,7 +1293,7 @@ int write_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)

trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "finish block_ops");

- f2fs_flush_merged_bios(sbi);
+ f2fs_flush_merged_writes(sbi);

/* this is the case of multiple fstrims without any changes */
if (cpc->reason & CP_DISCARD) {
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 7c0f6bdf817d..06bb2042385e 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -291,14 +291,12 @@ static bool has_merged_page(struct f2fs_sb_info *sbi, struct inode *inode,
return ret;
}

-static void __f2fs_submit_merged_bio(struct f2fs_sb_info *sbi,
+static void __f2fs_submit_merged_write(struct f2fs_sb_info *sbi,
struct inode *inode, nid_t ino, pgoff_t idx,
- enum page_type type, int rw)
+ enum page_type type)
{
enum page_type btype = PAGE_TYPE_OF_BIO(type);
- struct f2fs_bio_info *io;
-
- io = is_read_io(rw) ? &sbi->read_io : &sbi->write_io[btype];
+ struct f2fs_bio_info *io = &sbi->write_io[btype];

down_write(&io->io_rwsem);

@@ -318,25 +316,24 @@ static void __f2fs_submit_merged_bio(struct f2fs_sb_info *sbi,
up_write(&io->io_rwsem);
}

-void f2fs_submit_merged_bio(struct f2fs_sb_info *sbi, enum page_type type,
- int rw)
+void f2fs_submit_merged_write(struct f2fs_sb_info *sbi, enum page_type type)
{
- __f2fs_submit_merged_bio(sbi, NULL, 0, 0, type, rw);
+ __f2fs_submit_merged_write(sbi, NULL, 0, 0, type);
}

-void f2fs_submit_merged_bio_cond(struct f2fs_sb_info *sbi,
+void f2fs_submit_merged_write_cond(struct f2fs_sb_info *sbi,
struct inode *inode, nid_t ino, pgoff_t idx,
- enum page_type type, int rw)
+ enum page_type type)
{
if (has_merged_page(sbi, inode, ino, idx, type))
- __f2fs_submit_merged_bio(sbi, inode, ino, idx, type, rw);
+ __f2fs_submit_merged_write(sbi, inode, ino, idx, type);
}

-void f2fs_flush_merged_bios(struct f2fs_sb_info *sbi)
+void f2fs_flush_merged_writes(struct f2fs_sb_info *sbi)
{
- f2fs_submit_merged_bio(sbi, DATA, WRITE);
- f2fs_submit_merged_bio(sbi, NODE, WRITE);
- f2fs_submit_merged_bio(sbi, META, WRITE);
+ f2fs_submit_merged_write(sbi, DATA);
+ f2fs_submit_merged_write(sbi, NODE);
+ f2fs_submit_merged_write(sbi, META);
}

/*
@@ -368,16 +365,15 @@ int f2fs_submit_page_bio(struct f2fs_io_info *fio)
return 0;
}

-int f2fs_submit_page_mbio(struct f2fs_io_info *fio)
+int f2fs_submit_page_write(struct f2fs_io_info *fio)
{
struct f2fs_sb_info *sbi = fio->sbi;
enum page_type btype = PAGE_TYPE_OF_BIO(fio->type);
- struct f2fs_bio_info *io;
- bool is_read = is_read_io(fio->op);
+ struct f2fs_bio_info *io = &sbi->write_io[btype];
struct page *bio_page;
int err = 0;

- io = is_read ? &sbi->read_io : &sbi->write_io[btype];
+ f2fs_bug_on(sbi, is_read_io(fio->op));

if (fio->old_blkaddr != NEW_ADDR)
verify_block_addr(sbi, fio->old_blkaddr);
@@ -388,8 +384,7 @@ int f2fs_submit_page_mbio(struct f2fs_io_info *fio)
/* set submitted = 1 as a return value */
fio->submitted = 1;

- if (!is_read)
- inc_page_count(sbi, WB_DATA_TYPE(bio_page));
+ inc_page_count(sbi, WB_DATA_TYPE(bio_page));

down_write(&io->io_rwsem);

@@ -402,12 +397,11 @@ int f2fs_submit_page_mbio(struct f2fs_io_info *fio)
if ((fio->type == DATA || fio->type == NODE) &&
fio->new_blkaddr & F2FS_IO_SIZE_MASK(sbi)) {
err = -EAGAIN;
- if (!is_read)
- dec_page_count(sbi, WB_DATA_TYPE(bio_page));
+ dec_page_count(sbi, WB_DATA_TYPE(bio_page));
goto out_fail;
}
io->bio = __bio_alloc(sbi, fio->new_blkaddr,
- BIO_MAX_PAGES, is_read);
+ BIO_MAX_PAGES, false);
io->fio = *fio;
}

@@ -421,7 +415,7 @@ int f2fs_submit_page_mbio(struct f2fs_io_info *fio)
f2fs_trace_ios(fio, 0);
out_fail:
up_write(&io->io_rwsem);
- trace_f2fs_submit_page_mbio(fio->page, fio);
+ trace_f2fs_submit_page_write(fio->page, fio);
return err;
}

@@ -1321,7 +1315,7 @@ static int encrypt_one_page(struct f2fs_io_info *fio)

/* flush pending IOs and wait for a while in the ENOMEM case */
if (PTR_ERR(fio->encrypted_page) == -ENOMEM) {
- f2fs_flush_merged_bios(fio->sbi);
+ f2fs_flush_merged_writes(fio->sbi);
congestion_wait(BLK_RW_ASYNC, HZ/50);
gfp_flags |= __GFP_NOFAIL;
goto retry_encrypt;
@@ -1513,8 +1507,7 @@ static int __write_data_page(struct page *page, bool *submitted,
ClearPageUptodate(page);

if (wbc->for_reclaim) {
- f2fs_submit_merged_bio_cond(sbi, inode, 0, page->index,
- DATA, WRITE);
+ f2fs_submit_merged_write_cond(sbi, inode, 0, page->index, DATA);
clear_inode_flag(inode, FI_HOT_DATA);
remove_dirty_inode(inode);
submitted = NULL;
@@ -1525,7 +1518,7 @@ static int __write_data_page(struct page *page, bool *submitted,
f2fs_balance_fs(sbi, need_balance_fs);

if (unlikely(f2fs_cp_error(sbi))) {
- f2fs_submit_merged_bio(sbi, DATA, WRITE);
+ f2fs_submit_merged_write(sbi, DATA);
submitted = NULL;
}

@@ -1684,8 +1677,8 @@ static int f2fs_write_cache_pages(struct address_space *mapping,
mapping->writeback_index = done_index;

if (last_idx != ULONG_MAX)
- f2fs_submit_merged_bio_cond(F2FS_M_SB(mapping), mapping->host,
- 0, last_idx, DATA, WRITE);
+ f2fs_submit_merged_write_cond(F2FS_M_SB(mapping), mapping->host,
+ 0, last_idx, DATA);

return ret;
}
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index e26999a74522..bf837458cb18 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -2325,14 +2325,13 @@ void destroy_checkpoint_caches(void);
/*
* data.c
*/
-void f2fs_submit_merged_bio(struct f2fs_sb_info *sbi, enum page_type type,
- int rw);
-void f2fs_submit_merged_bio_cond(struct f2fs_sb_info *sbi,
+void f2fs_submit_merged_write(struct f2fs_sb_info *sbi, enum page_type type);
+void f2fs_submit_merged_write_cond(struct f2fs_sb_info *sbi,
struct inode *inode, nid_t ino, pgoff_t idx,
- enum page_type type, int rw);
-void f2fs_flush_merged_bios(struct f2fs_sb_info *sbi);
+ enum page_type type);
+void f2fs_flush_merged_writes(struct f2fs_sb_info *sbi);
int f2fs_submit_page_bio(struct f2fs_io_info *fio);
-int f2fs_submit_page_mbio(struct f2fs_io_info *fio);
+int f2fs_submit_page_write(struct f2fs_io_info *fio);
struct block_device *f2fs_target_device(struct f2fs_sb_info *sbi,
block_t blk_addr, struct bio *bio);
int f2fs_target_device_index(struct f2fs_sb_info *sbi, block_t blkaddr);
diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index 965fbf5d0a2e..67b87155bc48 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -670,7 +670,7 @@ static void move_encrypted_block(struct inode *inode, block_t bidx,
fio.op = REQ_OP_WRITE;
fio.op_flags = REQ_SYNC;
fio.new_blkaddr = newaddr;
- f2fs_submit_page_mbio(&fio);
+ f2fs_submit_page_write(&fio);

f2fs_update_data_blkaddr(&dn, newaddr);
set_inode_flag(inode, FI_APPEND_WRITE);
@@ -936,8 +936,8 @@ static int do_garbage_collect(struct f2fs_sb_info *sbi,
}

if (gc_type == FG_GC)
- f2fs_submit_merged_bio(sbi,
- (type == SUM_TYPE_NODE) ? NODE : DATA, WRITE);
+ f2fs_submit_merged_write(sbi,
+ (type == SUM_TYPE_NODE) ? NODE : DATA);

blk_finish_plug(&plug);

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 98351a4a4da3..41bb632ac2e0 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -1373,15 +1373,15 @@ static int __write_node_page(struct page *page, bool atomic, bool *submitted,
up_read(&sbi->node_write);

if (wbc->for_reclaim) {
- f2fs_submit_merged_bio_cond(sbi, page->mapping->host, 0,
- page->index, NODE, WRITE);
+ f2fs_submit_merged_write_cond(sbi, page->mapping->host, 0,
+ page->index, NODE);
submitted = NULL;
}

unlock_page(page);

if (unlikely(f2fs_cp_error(sbi))) {
- f2fs_submit_merged_bio(sbi, NODE, WRITE);
+ f2fs_submit_merged_write(sbi, NODE);
submitted = NULL;
}
if (submitted)
@@ -1518,8 +1518,7 @@ int fsync_node_pages(struct f2fs_sb_info *sbi, struct inode *inode,
}
out:
if (last_idx != ULONG_MAX)
- f2fs_submit_merged_bio_cond(sbi, NULL, ino, last_idx,
- NODE, WRITE);
+ f2fs_submit_merged_write_cond(sbi, NULL, ino, last_idx, NODE);
return ret ? -EIO: 0;
}

@@ -1625,7 +1624,7 @@ int sync_node_pages(struct f2fs_sb_info *sbi, struct writeback_control *wbc)
}
out:
if (nwritten)
- f2fs_submit_merged_bio(sbi, NODE, WRITE);
+ f2fs_submit_merged_write(sbi, NODE);
return ret;
}

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index de31030b5041..38bb675976e2 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -328,8 +328,7 @@ static int __commit_inmem_pages(struct inode *inode,
}

if (last_idx != ULONG_MAX)
- f2fs_submit_merged_bio_cond(sbi, inode, 0, last_idx,
- DATA, WRITE);
+ f2fs_submit_merged_write_cond(sbi, inode, 0, last_idx, DATA);

if (!err)
__revoke_inmem_pages(inode, revoke_list, false, false);
@@ -2150,7 +2149,7 @@ static void do_write_page(struct f2fs_summary *sum, struct f2fs_io_info *fio)
&fio->new_blkaddr, sum, type);

/* writeout dirty page into bdev */
- err = f2fs_submit_page_mbio(fio);
+ err = f2fs_submit_page_write(fio);
if (err == -EAGAIN) {
fio->old_blkaddr = fio->new_blkaddr;
goto reallocate;
@@ -2177,7 +2176,7 @@ void write_meta_page(struct f2fs_sb_info *sbi, struct page *page)
fio.op_flags &= ~REQ_META;

set_page_writeback(page);
- f2fs_submit_page_mbio(&fio);
+ f2fs_submit_page_write(&fio);
}

void write_node_page(unsigned int nid, struct f2fs_io_info *fio)
@@ -2296,8 +2295,8 @@ void f2fs_wait_on_page_writeback(struct page *page,
if (PageWriteback(page)) {
struct f2fs_sb_info *sbi = F2FS_P_SB(page);

- f2fs_submit_merged_bio_cond(sbi, page->mapping->host,
- 0, page->index, type, WRITE);
+ f2fs_submit_merged_write_cond(sbi, page->mapping->host,
+ 0, page->index, type);
if (ordered)
wait_on_page_writeback(page);
else
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 83355ec4a92c..104a571a41c0 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -817,7 +817,7 @@ static void f2fs_put_super(struct super_block *sb)
mutex_unlock(&sbi->umount_mutex);

/* our cp_error case, we can wait for any writeback page */
- f2fs_flush_merged_bios(sbi);
+ f2fs_flush_merged_writes(sbi);

iput(sbi->node_inode);
iput(sbi->meta_inode);
diff --git a/include/trace/events/f2fs.h b/include/trace/events/f2fs.h
index 15da88c5c3a4..5805d92893a8 100644
--- a/include/trace/events/f2fs.h
+++ b/include/trace/events/f2fs.h
@@ -790,7 +790,7 @@ DEFINE_EVENT_CONDITION(f2fs__submit_page_bio, f2fs_submit_page_bio,
TP_CONDITION(page->mapping)
);

-DEFINE_EVENT_CONDITION(f2fs__submit_page_bio, f2fs_submit_page_mbio,
+DEFINE_EVENT_CONDITION(f2fs__submit_page_bio, f2fs_submit_page_write,

TP_PROTO(struct page *page, struct f2fs_io_info *fio),

--
2.11.0