open code mpage_alloc in it's two callers and simplify the results
because of the context:
- __mpage_writepage always passes GFP_NOFS and can thus always sleep and
will never get a NULL return from bio_alloc at all.
- do_mpage_readpage can only get a non-sleeping context for readahead
which never sets PF_MEMALLOC and thus doesn't need the retry loop
either.
Both cases will never have __GFP_HIGH set.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
fs/mpage.c | 35 ++++++-----------------------------
1 file changed, 6 insertions(+), 29 deletions(-)
diff --git a/fs/mpage.c b/fs/mpage.c
index 87f5cfef6caa7..06e95d777e940 100644
--- a/fs/mpage.c
+++ b/fs/mpage.c
@@ -66,29 +66,6 @@ static struct bio *mpage_bio_submit(int op, int op_flags, struct bio *bio)
return NULL;
}
-static struct bio *
-mpage_alloc(struct block_device *bdev,
- sector_t first_sector, int nr_vecs,
- gfp_t gfp_flags)
-{
- struct bio *bio;
-
- /* Restrict the given (page cache) mask for slab allocations */
- gfp_flags &= GFP_KERNEL;
- bio = bio_alloc(gfp_flags, nr_vecs);
-
- if (bio == NULL && (current->flags & PF_MEMALLOC)) {
- while (!bio && (nr_vecs /= 2))
- bio = bio_alloc(gfp_flags, nr_vecs);
- }
-
- if (bio) {
- bio_set_dev(bio, bdev);
- bio->bi_iter.bi_sector = first_sector;
- }
- return bio;
-}
-
/*
* support function for mpage_readahead. The fs supplied get_block might
* return an up to date buffer. This is used to map that buffer into
@@ -296,10 +273,11 @@ static struct bio *do_mpage_readpage(struct mpage_readpage_args *args)
page))
goto out;
}
- args->bio = mpage_alloc(bdev, blocks[0] << (blkbits - 9),
- bio_max_segs(args->nr_pages), gfp);
+ args->bio = bio_alloc(gfp, bio_max_segs(args->nr_pages));
if (args->bio == NULL)
goto confused;
+ bio_set_dev(args->bio, bdev);
+ args->bio->bi_iter.bi_sector = blocks[0] << (blkbits - 9);
}
length = first_hole << blkbits;
@@ -608,10 +586,9 @@ static int __mpage_writepage(struct page *page, struct writeback_control *wbc,
page, wbc))
goto out;
}
- bio = mpage_alloc(bdev, blocks[0] << (blkbits - 9),
- BIO_MAX_VECS, GFP_NOFS|__GFP_HIGH);
- if (bio == NULL)
- goto confused;
+ bio = bio_alloc(GFP_NOFS, BIO_MAX_VECS);
+ bio_set_dev(bio, bdev);
+ bio->bi_iter.bi_sector = blocks[0] << (blkbits - 9);
wbc_init_bio(wbc, bio);
bio->bi_write_hint = inode->i_write_hint;
--
2.30.2
--
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