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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2024, Alibaba Cloud
*/
#include "internal.h"
#include <trace/events/erofs.h>
struct erofs_fileio_rq {
struct bio_vec bvecs[BIO_MAX_VECS];
struct bio bio;
struct kiocb iocb;
struct super_block *sb;
refcount_t ref;
};
struct erofs_fileio {
struct erofs_map_blocks map;
struct erofs_map_dev dev;
struct erofs_fileio_rq *rq;
};
static void erofs_fileio_ki_complete(struct kiocb *iocb, long ret)
{
struct erofs_fileio_rq *rq =
container_of(iocb, struct erofs_fileio_rq, iocb);
struct folio_iter fi;
if (ret > 0) {
if (ret != rq->bio.bi_iter.bi_size) {
bio_advance(&rq->bio, ret);
zero_fill_bio(&rq->bio);
}
ret = 0;
}
if (rq->bio.bi_end_io) {
if (ret < 0 && !rq->bio.bi_status)
rq->bio.bi_status = errno_to_blk_status(ret);
rq->bio.bi_end_io(&rq->bio);
} else {
bio_for_each_folio_all(fi, &rq->bio) {
DBG_BUGON(folio_test_uptodate(fi.folio));
erofs_onlinefolio_end(fi.folio, ret, false);
}
}
bio_uninit(&rq->bio);
if (refcount_dec_and_test(&rq->ref))
kfree(rq);
}
static void erofs_fileio_rq_submit(struct erofs_fileio_rq *rq)
{
struct iov_iter iter;
int ret;
if (!rq)
return;
rq->iocb.ki_pos = rq->bio.bi_iter.bi_sector << SECTOR_SHIFT;
rq->iocb.ki_ioprio = get_current_ioprio();
rq->iocb.ki_complete = erofs_fileio_ki_complete;
if (test_opt(&EROFS_SB(rq->sb)->opt, DIRECT_IO) &&
rq->iocb.ki_filp->f_mode & FMODE_CAN_ODIRECT)
rq->iocb.ki_flags = IOCB_DIRECT;
iov_iter_bvec(&iter, ITER_DEST, rq->bvecs, rq->bio.bi_vcnt,
rq->bio.bi_iter.bi_size);
ret = vfs_iocb_iter_read(rq->iocb.ki_filp, &rq->iocb, &iter);
if (ret != -EIOCBQUEUED)
erofs_fileio_ki_complete(&rq->iocb, ret);
if (refcount_dec_and_test(&rq->ref))
kfree(rq);
}
static struct erofs_fileio_rq *erofs_fileio_rq_alloc(struct erofs_map_dev *mdev)
{
struct erofs_fileio_rq *rq = kzalloc(sizeof(*rq),
GFP_KERNEL | __GFP_NOFAIL);
bio_init(&rq->bio, NULL, rq->bvecs, BIO_MAX_VECS, REQ_OP_READ);
rq->iocb.ki_filp = mdev->m_dif->file;
rq->sb = mdev->m_sb;
refcount_set(&rq->ref, 2);
return rq;
}
struct bio *erofs_fileio_bio_alloc(struct erofs_map_dev *mdev)
{
return &erofs_fileio_rq_alloc(mdev)->bio;
}
void erofs_fileio_submit_bio(struct bio *bio)
{
return erofs_fileio_rq_submit(container_of(bio, struct erofs_fileio_rq,
bio));
}
static int erofs_fileio_scan_folio(struct erofs_fileio *io, struct folio *folio)
{
struct inode *inode = folio_inode(folio);
struct erofs_map_blocks *map = &io->map;
unsigned int cur = 0, end = folio_size(folio), len, attached = 0;
loff_t pos = folio_pos(folio), ofs;
struct iov_iter iter;
struct bio_vec bv;
int err = 0;
erofs_onlinefolio_init(folio);
while (cur < end) {
if (!in_range(pos + cur, map->m_la, map->m_llen)) {
map->m_la = pos + cur;
map->m_llen = end - cur;
err = erofs_map_blocks(inode, map);
if (err)
break;
}
ofs = folio_pos(folio) + cur - map->m_la;
len = min_t(loff_t, map->m_llen - ofs, end - cur);
if (map->m_flags & EROFS_MAP_META) {
struct erofs_buf buf = __EROFS_BUF_INITIALIZER;
void *src;
src = erofs_read_metabuf(&buf, inode->i_sb,
map->m_pa + ofs, EROFS_KMAP);
if (IS_ERR(src)) {
err = PTR_ERR(src);
break;
}
bvec_set_folio(&bv, folio, len, cur);
iov_iter_bvec(&iter, ITER_DEST, &bv, 1, len);
if (copy_to_iter(src, len, &iter) != len) {
erofs_put_metabuf(&buf);
err = -EIO;
break;
}
erofs_put_metabuf(&buf);
} else if (!(map->m_flags & EROFS_MAP_MAPPED)) {
folio_zero_segment(folio, cur, cur + len);
attached = 0;
} else {
if (io->rq && (map->m_pa + ofs != io->dev.m_pa ||
map->m_deviceid != io->dev.m_deviceid)) {
io_retry:
erofs_fileio_rq_submit(io->rq);
io->rq = NULL;
}
if (!io->rq) {
io->dev = (struct erofs_map_dev) {
.m_pa = io->map.m_pa + ofs,
.m_deviceid = io->map.m_deviceid,
};
err = erofs_map_dev(inode->i_sb, &io->dev);
if (err)
break;
io->rq = erofs_fileio_rq_alloc(&io->dev);
io->rq->bio.bi_iter.bi_sector = io->dev.m_pa >> 9;
attached = 0;
}
if (!bio_add_folio(&io->rq->bio, folio, len, cur))
goto io_retry;
if (!attached++)
erofs_onlinefolio_split(folio);
io->dev.m_pa += len;
}
cur += len;
}
erofs_onlinefolio_end(folio, err, false);
return err;
}
static int erofs_fileio_read_folio(struct file *file, struct folio *folio)
{
struct erofs_fileio io = {};
int err;
trace_erofs_read_folio(folio, true);
err = erofs_fileio_scan_folio(&io, folio);
erofs_fileio_rq_submit(io.rq);
return err;
}
static void erofs_fileio_readahead(struct readahead_control *rac)
{
struct inode *inode = rac->mapping->host;
struct erofs_fileio io = {};
struct folio *folio;
int err;
trace_erofs_readahead(inode, readahead_index(rac),
readahead_count(rac), true);
while ((folio = readahead_folio(rac))) {
err = erofs_fileio_scan_folio(&io, folio);
if (err && err != -EINTR)
erofs_err(inode->i_sb, "readahead error at folio %lu @ nid %llu",
folio->index, EROFS_I(inode)->nid);
}
erofs_fileio_rq_submit(io.rq);
}
const struct address_space_operations erofs_fileio_aops = {
.read_folio = erofs_fileio_read_folio,
.readahead = erofs_fileio_readahead,
};
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