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ext4: readpages() should submit IO as read-ahead

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a_ops->readpages() is only ever used for read-ahead.  Ensure that we
pass this information down to the block layer.

Link: http://lkml.kernel.org/r/20180621010725.17813-5-axboe@kernel.dk
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Chris Mason <clm@fb.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jens Axboe 2018-08-17 15:45:42 -07:00 committed by Jaegeuk Kim
parent 693ad1e5b3
commit 2ff972ed7e
3 changed files with 7 additions and 5 deletions
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2
fs/ext4/ext4.h
View File

@ -3201,7 +3201,7 @@ static inline void ext4_set_de_type(struct super_block *sb,
/* readpages.c */
extern int ext4_mpage_readpages(struct address_space *mapping,
struct list_head *pages, struct page *page,
unsigned nr_pages);
unsigned nr_pages, bool is_readahead);
extern int __init ext4_init_post_read_processing(void);
extern void ext4_exit_post_read_processing(void);

5
fs/ext4/inode.c
View File

@ -3328,7 +3328,8 @@ static int ext4_readpage(struct file *file, struct page *page)
ret = ext4_readpage_inline(inode, page);
if (ret == -EAGAIN)
return ext4_mpage_readpages(page->mapping, NULL, page, 1);
return ext4_mpage_readpages(page->mapping, NULL, page, 1,
false);
return ret;
}
@ -3343,7 +3344,7 @@ ext4_readpages(struct file *file, struct address_space *mapping,
if (ext4_has_inline_data(inode))
return 0;
return ext4_mpage_readpages(mapping, pages, NULL, nr_pages);
return ext4_mpage_readpages(mapping, pages, NULL, nr_pages, true);
}
static void ext4_invalidatepage(struct page *page, unsigned int offset,

5
fs/ext4/readpage.c
View File

@ -211,7 +211,7 @@ static inline loff_t ext4_readpage_limit(struct inode *inode)
int ext4_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;
@ -373,7 +373,8 @@ int ext4_mpage_readpages(struct address_space *mapping,
bio->bi_iter.bi_sector = blocks[0] << (blkbits - 9);
bio->bi_end_io = mpage_end_io;
bio->bi_private = ctx;
bio_set_op_attrs(bio, REQ_OP_READ, 0);
bio_set_op_attrs(bio, REQ_OP_READ,
is_readahead ? REQ_RAHEAD : 0);
}
length = first_hole << blkbits;