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erofs: support compressed inodes over fscache

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Since fscache can utilize iov_iter to write dest buffers, bio_vec can
be used in this way too.

To simplify this, pseudo bios are prepared and bio_vec will be filled
with bio_add_page().  And a common .bi_end_io will be called directly
to handle I/O completions.

Signed-off-by: Jingbo Xu <jefflexu@linux.alibaba.com>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20240308094159.40547-2-jefflexu@linux.alibaba.com
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
This commit is contained in:
Jingbo Xu
2024-03-08 17:41:59 +08:00
committed by Gao Xiang
parent f2151df574
commit a1bafc3109
4 changed files with 77 additions and 20 deletions
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47
fs/erofs/fscache.c
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@@ -174,6 +174,53 @@ static int erofs_fscache_read_io_async(struct fscache_cookie *cookie,
return 0;
}
struct erofs_fscache_bio {
struct erofs_fscache_io io;
struct bio bio; /* w/o bdev to share bio_add_page/endio() */
struct bio_vec bvecs[BIO_MAX_VECS];
};
static void erofs_fscache_bio_endio(void *priv,
ssize_t transferred_or_error, bool was_async)
{
struct erofs_fscache_bio *io = priv;
if (IS_ERR_VALUE(transferred_or_error))
io->bio.bi_status = errno_to_blk_status(transferred_or_error);
io->bio.bi_end_io(&io->bio);
BUILD_BUG_ON(offsetof(struct erofs_fscache_bio, io) != 0);
erofs_fscache_io_put(&io->io);
}
struct bio *erofs_fscache_bio_alloc(struct erofs_map_dev *mdev)
{
struct erofs_fscache_bio *io;
io = kmalloc(sizeof(*io), GFP_KERNEL | __GFP_NOFAIL);
bio_init(&io->bio, NULL, io->bvecs, BIO_MAX_VECS, REQ_OP_READ);
io->io.private = mdev->m_fscache->cookie;
io->io.end_io = erofs_fscache_bio_endio;
refcount_set(&io->io.ref, 1);
return &io->bio;
}
void erofs_fscache_submit_bio(struct bio *bio)
{
struct erofs_fscache_bio *io = container_of(bio,
struct erofs_fscache_bio, bio);
int ret;
iov_iter_bvec(&io->io.iter, ITER_DEST, io->bvecs, bio->bi_vcnt,
bio->bi_iter.bi_size);
ret = erofs_fscache_read_io_async(io->io.private,
bio->bi_iter.bi_sector << 9, &io->io);
erofs_fscache_io_put(&io->io);
if (!ret)
return;
bio->bi_status = errno_to_blk_status(ret);
bio->bi_end_io(bio);
}
static int erofs_fscache_meta_read_folio(struct file *data, struct folio *folio)
{
struct erofs_fscache *ctx = folio->mapping->host->i_private;