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writeback: add wbc_to_write_flags() 

Add wbc_to_write_flags(), which returns the write modifier flags to use,
based on a struct writeback_control. No functional changes in this
patch, but it prepares us for factoring other wbc fields for write type.

Signed-off-by: Jens Axboe <axboe@fb.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Jens Axboe 2016-11-01 10:00:38 -06:00
parent 1d796d6a96
commit 7637241e65
8 changed files with 17 additions and 16 deletions
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2
fs/buffer.c
View File

@ -1697,7 +1697,7 @@ int __block_write_full_page(struct inode *inode, struct page *page,
struct buffer_head *bh, *head;
unsigned int blocksize, bbits;
int nr_underway = 0;
int write_flags = (wbc->sync_mode == WB_SYNC_ALL ? REQ_SYNC : 0);
int write_flags = wbc_to_write_flags(wbc);
head = create_page_buffers(page, inode,
(1 << BH_Dirty)|(1 << BH_Uptodate));

2
fs/f2fs/data.c
View File

@ -1249,7 +1249,7 @@ static int f2fs_write_data_page(struct page *page,
.sbi = sbi,
.type = DATA,
.op = REQ_OP_WRITE,
.op_flags = (wbc->sync_mode == WB_SYNC_ALL) ? REQ_SYNC : 0,
.op_flags = wbc_to_write_flags(wbc),
.page = page,
.encrypted_page = NULL,
};

2
fs/f2fs/node.c
View File

@ -1570,7 +1570,7 @@ static int f2fs_write_node_page(struct page *page,
.sbi = sbi,
.type = NODE,
.op = REQ_OP_WRITE,
.op_flags = (wbc->sync_mode == WB_SYNC_ALL) ? REQ_SYNC : 0,
.op_flags = wbc_to_write_flags(wbc),
.page = page,
.encrypted_page = NULL,
};

3
fs/gfs2/meta_io.c
View File

@ -37,8 +37,7 @@ static int gfs2_aspace_writepage(struct page *page, struct writeback_control *wb
{
struct buffer_head *bh, *head;
int nr_underway = 0;
int write_flags = REQ_META | REQ_PRIO |
(wbc->sync_mode == WB_SYNC_ALL ? REQ_SYNC : 0);
int write_flags = REQ_META | REQ_PRIO | wbc_to_write_flags(wbc);
BUG_ON(!PageLocked(page));
BUG_ON(!page_has_buffers(page));

2
fs/mpage.c
View File

@ -489,7 +489,7 @@ static int __mpage_writepage(struct page *page, struct writeback_control *wbc,
struct buffer_head map_bh;
loff_t i_size = i_size_read(inode);
int ret = 0;
int op_flags = (wbc->sync_mode == WB_SYNC_ALL ? REQ_SYNC : 0);
int op_flags = wbc_to_write_flags(wbc);
if (page_has_buffers(page)) {
struct buffer_head *head = page_buffers(page);

8
fs/xfs/xfs_aops.c
View File

@ -495,9 +495,7 @@ xfs_submit_ioend(
ioend->io_bio->bi_private = ioend;
ioend->io_bio->bi_end_io = xfs_end_bio;
ioend->io_bio->bi_opf = REQ_OP_WRITE;
if (wbc->sync_mode == WB_SYNC_ALL)
ioend->io_bio->bi_opf |= REQ_SYNC;
ioend->io_bio->bi_opf = REQ_OP_WRITE | wbc_to_write_flags(wbc);
/*
* If we are failing the IO now, just mark the ioend with an
@ -569,9 +567,7 @@ xfs_chain_bio(
bio_chain(ioend->io_bio, new);
bio_get(ioend->io_bio); /* for xfs_destroy_ioend */
ioend->io_bio->bi_opf = REQ_OP_WRITE;
if (wbc->sync_mode == WB_SYNC_ALL)
ioend->io_bio->bi_opf |= REQ_SYNC;
ioend->io_bio->bi_opf = REQ_OP_WRITE | wbc_to_write_flags(wbc);
submit_bio(ioend->io_bio);
ioend->io_bio = new;
}

9
include/linux/writeback.h
View File

@ -9,6 +9,7 @@
#include <linux/fs.h>
#include <linux/flex_proportions.h>
#include <linux/backing-dev-defs.h>
#include <linux/blk_types.h>
struct bio;
@ -102,6 +103,14 @@ struct writeback_control {
#endif
};
static inline int wbc_to_write_flags(struct writeback_control *wbc)
{
if (wbc->sync_mode == WB_SYNC_ALL)
return REQ_SYNC;
return 0;
}
/*
* A wb_domain represents a domain that wb's (bdi_writeback's) belong to
* and are measured against each other in. There always is one global

5
mm/page_io.c
View File

@ -320,10 +320,7 @@ int __swap_writepage(struct page *page, struct writeback_control *wbc,
ret = -ENOMEM;
goto out;
}
if (wbc->sync_mode == WB_SYNC_ALL)
bio_set_op_attrs(bio, REQ_OP_WRITE, REQ_SYNC);
else
bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
bio->bi_opf = REQ_OP_WRITE | wbc_to_write_flags(wbc);
count_vm_event(PSWPOUT);
set_page_writeback(page);
unlock_page(page);