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Date: Fri, 8 Mar 2024 17:41:59 +0800
From: Jingbo Xu <jefflexu@...ux.alibaba.com>
To: xiang@...nel.org,
chao@...nel.org,
huyue2@...lpad.com,
linux-erofs@...ts.ozlabs.org
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] erofs: support compressed inodes over fscache
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 completion.
Signed-off-by: Jingbo Xu <jefflexu@...ux.alibaba.com>
---
fs/erofs/fscache.c | 47 +++++++++++++++++++++++++++++++++++++++++++++
fs/erofs/inode.c | 14 ++++++--------
fs/erofs/internal.h | 4 ++++
fs/erofs/zdata.c | 32 ++++++++++++++++++------------
4 files changed, 77 insertions(+), 20 deletions(-)
diff --git a/fs/erofs/fscache.c b/fs/erofs/fscache.c
index b9fb4c4da39c..8aff1a724805 100644
--- a/fs/erofs/fscache.c
+++ b/fs/erofs/fscache.c
@@ -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;
diff --git a/fs/erofs/inode.c b/fs/erofs/inode.c
index 36e638e8b53a..0eb0e6f933c3 100644
--- a/fs/erofs/inode.c
+++ b/fs/erofs/inode.c
@@ -259,14 +259,12 @@ static int erofs_fill_inode(struct inode *inode)
if (erofs_inode_is_data_compressed(vi->datalayout)) {
#ifdef CONFIG_EROFS_FS_ZIP
- if (!erofs_is_fscache_mode(inode->i_sb)) {
- DO_ONCE_LITE_IF(inode->i_sb->s_blocksize != PAGE_SIZE,
- erofs_info, inode->i_sb,
- "EXPERIMENTAL EROFS subpage compressed block support in use. Use at your own risk!");
- inode->i_mapping->a_ops = &z_erofs_aops;
- err = 0;
- goto out_unlock;
- }
+ DO_ONCE_LITE_IF(inode->i_blkbits != PAGE_SHIFT,
+ erofs_info, inode->i_sb,
+ "EXPERIMENTAL EROFS subpage compressed block support in use. Use at your own risk!");
+ inode->i_mapping->a_ops = &z_erofs_aops;
+ err = 0;
+ goto out_unlock;
#endif
err = -EOPNOTSUPP;
goto out_unlock;
diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h
index f8623113be6c..92120bf4ab71 100644
--- a/fs/erofs/internal.h
+++ b/fs/erofs/internal.h
@@ -512,6 +512,8 @@ void erofs_fscache_unregister_fs(struct super_block *sb);
struct erofs_fscache *erofs_fscache_register_cookie(struct super_block *sb,
char *name, unsigned int flags);
void erofs_fscache_unregister_cookie(struct erofs_fscache *fscache);
+struct bio *erofs_fscache_bio_alloc(struct erofs_map_dev *mdev);
+void erofs_fscache_submit_bio(struct bio *bio);
#else
static inline int erofs_fscache_register_fs(struct super_block *sb)
{
@@ -529,6 +531,8 @@ struct erofs_fscache *erofs_fscache_register_cookie(struct super_block *sb,
static inline void erofs_fscache_unregister_cookie(struct erofs_fscache *fscache)
{
}
+static inline struct bio *erofs_fscache_bio_alloc(struct erofs_map_dev *mdev) { return NULL; }
+static inline void erofs_fscache_submit_bio(struct bio *bio) {}
#endif
#define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c
index c1bd4d8392eb..3216b920d369 100644
--- a/fs/erofs/zdata.c
+++ b/fs/erofs/zdata.c
@@ -1561,7 +1561,7 @@ static void move_to_bypass_jobqueue(struct z_erofs_pcluster *pcl,
qtail[JQ_BYPASS] = &pcl->next;
}
-static void z_erofs_submissionqueue_endio(struct bio *bio)
+static void z_erofs_endio(struct bio *bio)
{
struct z_erofs_decompressqueue *q = bio->bi_private;
blk_status_t err = bio->bi_status;
@@ -1582,7 +1582,8 @@ static void z_erofs_submissionqueue_endio(struct bio *bio)
if (err)
q->eio = true;
z_erofs_decompress_kickoff(q, -1);
- bio_put(bio);
+ if (bio->bi_bdev)
+ bio_put(bio);
}
static void z_erofs_submit_queue(struct z_erofs_decompress_frontend *f,
@@ -1596,7 +1597,6 @@ static void z_erofs_submit_queue(struct z_erofs_decompress_frontend *f,
z_erofs_next_pcluster_t owned_head = f->owned_head;
/* bio is NULL initially, so no need to initialize last_{index,bdev} */
erofs_off_t last_pa;
- struct block_device *last_bdev;
unsigned int nr_bios = 0;
struct bio *bio = NULL;
unsigned long pflags;
@@ -1643,9 +1643,13 @@ static void z_erofs_submit_queue(struct z_erofs_decompress_frontend *f,
continue;
if (bio && (cur != last_pa ||
- last_bdev != mdev.m_bdev)) {
-submit_bio_retry:
- submit_bio(bio);
+ bio->bi_bdev != mdev.m_bdev)) {
+io_retry:
+ if (!erofs_is_fscache_mode(sb))
+ submit_bio(bio);
+ else
+ erofs_fscache_submit_bio(bio);
+
if (memstall) {
psi_memstall_leave(&pflags);
memstall = 0;
@@ -1660,15 +1664,16 @@ static void z_erofs_submit_queue(struct z_erofs_decompress_frontend *f,
}
if (!bio) {
- bio = bio_alloc(mdev.m_bdev, BIO_MAX_VECS,
- REQ_OP_READ, GFP_NOIO);
- bio->bi_end_io = z_erofs_submissionqueue_endio;
+ bio = erofs_is_fscache_mode(sb) ?
+ erofs_fscache_bio_alloc(&mdev) :
+ bio_alloc(mdev.m_bdev, BIO_MAX_VECS,
+ REQ_OP_READ, GFP_NOIO);
+ bio->bi_end_io = z_erofs_endio;
bio->bi_iter.bi_sector = cur >> 9;
bio->bi_private = q[JQ_SUBMIT];
if (readahead)
bio->bi_opf |= REQ_RAHEAD;
++nr_bios;
- last_bdev = mdev.m_bdev;
}
if (cur + bvec.bv_len > end)
@@ -1676,7 +1681,7 @@ static void z_erofs_submit_queue(struct z_erofs_decompress_frontend *f,
DBG_BUGON(bvec.bv_len < sb->s_blocksize);
if (!bio_add_page(bio, bvec.bv_page, bvec.bv_len,
bvec.bv_offset))
- goto submit_bio_retry;
+ goto io_retry;
last_pa = cur + bvec.bv_len;
bypass = false;
@@ -1689,7 +1694,10 @@ static void z_erofs_submit_queue(struct z_erofs_decompress_frontend *f,
} while (owned_head != Z_EROFS_PCLUSTER_TAIL);
if (bio) {
- submit_bio(bio);
+ if (!erofs_is_fscache_mode(sb))
+ submit_bio(bio);
+ else
+ erofs_fscache_submit_bio(bio);
if (memstall)
psi_memstall_leave(&pflags);
}
--
2.19.1.6.gb485710b
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