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f2fs: assign REQ_RAHEAD to bio for ->readpages 

As Jens reported, we'd better assign REQ_RAHEAD to bio by the fact that
->readpages is called only from read-ahead.

In Documentation/filesystems/vfs.txt,

readpages: called by the VM to read pages associated with the address_space
  	object. This is essentially just a vector version of
  	readpage.  Instead of just one page, several pages are
  	requested.
	readpages is only used for read-ahead, so read errors are
  	ignored.  If anything goes wrong, feel free to give up.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2018-06-21 11:29:43 -07:00
parent 2a63531a61
commit e2e59414aa
1 changed files with 13 additions and 7 deletions
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20
fs/f2fs/data.c
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@ -534,7 +534,7 @@ out:
}
static struct bio *f2fs_grab_read_bio(struct inode *inode, block_t blkaddr,
unsigned nr_pages)
unsigned nr_pages, unsigned op_flag)
{
struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
struct bio *bio;
@ -546,7 +546,7 @@ static struct bio *f2fs_grab_read_bio(struct inode *inode, block_t blkaddr,
return ERR_PTR(-ENOMEM);
f2fs_target_device(sbi, blkaddr, bio);
bio->bi_end_io = f2fs_read_end_io;
bio_set_op_attrs(bio, REQ_OP_READ, 0);
bio_set_op_attrs(bio, REQ_OP_READ, op_flag);
if (f2fs_encrypted_file(inode))
post_read_steps |= 1 << STEP_DECRYPT;
@ -571,7 +571,7 @@ static struct bio *f2fs_grab_read_bio(struct inode *inode, block_t blkaddr,
static int f2fs_submit_page_read(struct inode *inode, struct page *page,
block_t blkaddr)
{
struct bio *bio = f2fs_grab_read_bio(inode, blkaddr, 1);
struct bio *bio = f2fs_grab_read_bio(inode, blkaddr, 1, 0);
if (IS_ERR(bio))
return PTR_ERR(bio);
@ -1421,10 +1421,15 @@ out:
/*
* This function was originally taken from fs/mpage.c, and customized for f2fs.
* Major change was from block_size == page_size in f2fs by default.
*
* Note that the aops->readpages() function is ONLY used for read-ahead. If
* this function ever deviates from doing just read-ahead, it should either
* use ->readpage() or do the necessary surgery to decouple ->readpages()
* from read-ahead.
*/
static int f2fs_mpage_readpages(struct address_space *mapping,
struct list_head *pages, struct page *page,
unsigned nr_pages)
unsigned nr_pages, bool is_readahead)
{
struct bio *bio = NULL;
sector_t last_block_in_bio = 0;
@ -1514,7 +1519,8 @@ submit_and_realloc:
bio = NULL;
}
if (bio == NULL) {
bio = f2fs_grab_read_bio(inode, block_nr, nr_pages);
bio = f2fs_grab_read_bio(inode, block_nr, nr_pages,
is_readahead ? REQ_RAHEAD : 0);
if (IS_ERR(bio)) {
bio = NULL;
goto set_error_page;
@ -1558,7 +1564,7 @@ static int f2fs_read_data_page(struct file *file, struct page *page)
if (f2fs_has_inline_data(inode))
ret = f2fs_read_inline_data(inode, page);
if (ret == -EAGAIN)
ret = f2fs_mpage_readpages(page->mapping, NULL, page, 1);
ret = f2fs_mpage_readpages(page->mapping, NULL, page, 1, false);
return ret;
}
@ -1575,7 +1581,7 @@ static int f2fs_read_data_pages(struct file *file,
if (f2fs_has_inline_data(inode))
return 0;
return f2fs_mpage_readpages(mapping, pages, NULL, nr_pages);
return f2fs_mpage_readpages(mapping, pages, NULL, nr_pages, true);
}
static int encrypt_one_page(struct f2fs_io_info *fio)