[PATCH for-next 4/5] erofs: clean up decompress queue stuffs
From: Gao Xiang
Date: Tue Oct 08 2019 - 08:53:32 EST
Previously, both z_erofs_unzip_io and z_erofs_unzip_io_sb
record decompress queues for backend to use.
The only difference is that z_erofs_unzip_io is used for
on-stack sync decompression so that it doesn't have a super
block field (since the caller can pass it in its context),
but it increases complexity with only a pointer saving.
Rename z_erofs_unzip_io to z_erofs_decompressqueue with
a fixed super_block member and kill the other entirely,
and it can fallback to sync decompression if memory
allocation failure.
Signed-off-by: Gao Xiang <gaoxiang25@xxxxxxxxxx>
---
fs/erofs/zdata.c | 133 +++++++++++++++++++++--------------------------
fs/erofs/zdata.h | 8 +--
2 files changed, 60 insertions(+), 81 deletions(-)
diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c
index e2a89aa921b1..878449f11665 100644
--- a/fs/erofs/zdata.c
+++ b/fs/erofs/zdata.c
@@ -693,13 +693,11 @@ static int z_erofs_do_read_page(struct z_erofs_decompress_frontend *fe,
goto out;
}
-static void z_erofs_vle_unzip_kickoff(void *ptr, int bios)
+static void z_erofs_decompress_kickoff(struct z_erofs_decompressqueue *io,
+ bool sync, int bios)
{
- tagptr1_t t = tagptr_init(tagptr1_t, ptr);
- struct z_erofs_unzip_io *io = tagptr_unfold_ptr(t);
- bool background = tagptr_unfold_tags(t);
-
- if (!background) {
+ /* wake up the caller thread for sync decompression */
+ if (sync) {
unsigned long flags;
spin_lock_irqsave(&io->u.wait.lock, flags);
@@ -713,37 +711,30 @@ static void z_erofs_vle_unzip_kickoff(void *ptr, int bios)
queue_work(z_erofs_workqueue, &io->u.work);
}
-static inline void z_erofs_vle_read_endio(struct bio *bio)
+static void z_erofs_vle_read_endio(struct bio *bio)
{
- struct erofs_sb_info *sbi = NULL;
+ tagptr1_t t = tagptr_init(tagptr1_t, bio->bi_private);
+ struct z_erofs_decompressqueue *q = tagptr_unfold_ptr(t);
blk_status_t err = bio->bi_status;
struct bio_vec *bvec;
struct bvec_iter_all iter_all;
bio_for_each_segment_all(bvec, bio, iter_all) {
struct page *page = bvec->bv_page;
- bool cachemngd = false;
DBG_BUGON(PageUptodate(page));
DBG_BUGON(!page->mapping);
- if (!sbi && !z_erofs_page_is_staging(page))
- sbi = EROFS_SB(page->mapping->host->i_sb);
-
- /* sbi should already be gotten if the page is managed */
- if (sbi)
- cachemngd = erofs_page_is_managed(sbi, page);
-
if (err)
SetPageError(page);
- else if (cachemngd)
- SetPageUptodate(page);
- if (cachemngd)
+ if (erofs_page_is_managed(EROFS_SB(q->sb), page)) {
+ if (!err)
+ SetPageUptodate(page);
unlock_page(page);
+ }
}
-
- z_erofs_vle_unzip_kickoff(bio->bi_private, -1);
+ z_erofs_decompress_kickoff(q, tagptr_unfold_tags(t), -1);
bio_put(bio);
}
@@ -948,8 +939,7 @@ static int z_erofs_decompress_pcluster(struct super_block *sb,
return err;
}
-static void z_erofs_vle_unzip_all(struct super_block *sb,
- struct z_erofs_unzip_io *io,
+static void z_erofs_vle_unzip_all(const struct z_erofs_decompressqueue *io,
struct list_head *pagepool)
{
z_erofs_next_pcluster_t owned = io->head;
@@ -966,21 +956,21 @@ static void z_erofs_vle_unzip_all(struct super_block *sb,
pcl = container_of(owned, struct z_erofs_pcluster, next);
owned = READ_ONCE(pcl->next);
- z_erofs_decompress_pcluster(sb, pcl, pagepool);
+ z_erofs_decompress_pcluster(io->sb, pcl, pagepool);
}
}
static void z_erofs_vle_unzip_wq(struct work_struct *work)
{
- struct z_erofs_unzip_io_sb *iosb =
- container_of(work, struct z_erofs_unzip_io_sb, io.u.work);
+ struct z_erofs_decompressqueue *bgq =
+ container_of(work, struct z_erofs_decompressqueue, u.work);
LIST_HEAD(pagepool);
- DBG_BUGON(iosb->io.head == Z_EROFS_PCLUSTER_TAIL_CLOSED);
- z_erofs_vle_unzip_all(iosb->sb, &iosb->io, &pagepool);
+ DBG_BUGON(bgq->head == Z_EROFS_PCLUSTER_TAIL_CLOSED);
+ z_erofs_vle_unzip_all(bgq, &pagepool);
put_pages_list(&pagepool);
- kvfree(iosb);
+ kvfree(bgq);
}
static struct page *pickup_page_for_submission(struct z_erofs_pcluster *pcl,
@@ -1089,31 +1079,28 @@ static struct page *pickup_page_for_submission(struct z_erofs_pcluster *pcl,
return page;
}
-static struct z_erofs_unzip_io *jobqueue_init(struct super_block *sb,
- struct z_erofs_unzip_io *io,
- bool foreground)
+static struct z_erofs_decompressqueue *
+jobqueue_init(struct super_block *sb,
+ struct z_erofs_decompressqueue *fgq, bool *fg)
{
- struct z_erofs_unzip_io_sb *iosb;
+ struct z_erofs_decompressqueue *q;
- if (foreground) {
- /* waitqueue available for foreground io */
- DBG_BUGON(!io);
-
- init_waitqueue_head(&io->u.wait);
- atomic_set(&io->pending_bios, 0);
- goto out;
+ if (fg && !*fg) {
+ q = kvzalloc(sizeof(*q), GFP_KERNEL | __GFP_NOWARN);
+ if (!q) {
+ *fg = true;
+ goto fg_out;
+ }
+ INIT_WORK(&q->u.work, z_erofs_vle_unzip_wq);
+ } else {
+fg_out:
+ q = fgq;
+ init_waitqueue_head(&fgq->u.wait);
+ atomic_set(&fgq->pending_bios, 0);
}
-
- iosb = kvzalloc(sizeof(*iosb), GFP_KERNEL | __GFP_NOFAIL);
- DBG_BUGON(!iosb);
-
- /* initialize fields in the allocated descriptor */
- io = &iosb->io;
- iosb->sb = sb;
- INIT_WORK(&io->u.work, z_erofs_vle_unzip_wq);
-out:
- io->head = Z_EROFS_PCLUSTER_TAIL_CLOSED;
- return io;
+ q->sb = sb;
+ q->head = Z_EROFS_PCLUSTER_TAIL_CLOSED;
+ return q;
}
/* define decompression jobqueue types */
@@ -1124,22 +1111,17 @@ enum {
};
static void *jobqueueset_init(struct super_block *sb,
- z_erofs_next_pcluster_t qtail[],
- struct z_erofs_unzip_io *q[],
- struct z_erofs_unzip_io *fgq,
- bool forcefg)
+ struct z_erofs_decompressqueue *q[],
+ struct z_erofs_decompressqueue *fgq, bool *fg)
{
/*
* if managed cache is enabled, bypass jobqueue is needed,
* no need to read from device for all pclusters in this queue.
*/
- q[JQ_BYPASS] = jobqueue_init(sb, fgq + JQ_BYPASS, true);
- qtail[JQ_BYPASS] = &q[JQ_BYPASS]->head;
+ q[JQ_BYPASS] = jobqueue_init(sb, fgq + JQ_BYPASS, NULL);
+ q[JQ_SUBMIT] = jobqueue_init(sb, fgq + JQ_SUBMIT, fg);
- q[JQ_SUBMIT] = jobqueue_init(sb, fgq + JQ_SUBMIT, forcefg);
- qtail[JQ_SUBMIT] = &q[JQ_SUBMIT]->head;
-
- return tagptr_cast_ptr(tagptr_fold(tagptr1_t, q[JQ_SUBMIT], !forcefg));
+ return tagptr_cast_ptr(tagptr_fold(tagptr1_t, q[JQ_SUBMIT], *fg));
}
static void move_to_bypass_jobqueue(struct z_erofs_pcluster *pcl,
@@ -1161,9 +1143,8 @@ static void move_to_bypass_jobqueue(struct z_erofs_pcluster *pcl,
qtail[JQ_BYPASS] = &pcl->next;
}
-static bool postsubmit_is_all_bypassed(struct z_erofs_unzip_io *q[],
- unsigned int nr_bios,
- bool force_fg)
+static bool postsubmit_is_all_bypassed(struct z_erofs_decompressqueue *q[],
+ unsigned int nr_bios, bool force_fg)
{
/*
* although background is preferred, no one is pending for submission.
@@ -1172,19 +1153,19 @@ static bool postsubmit_is_all_bypassed(struct z_erofs_unzip_io *q[],
if (force_fg || nr_bios)
return false;
- kvfree(container_of(q[JQ_SUBMIT], struct z_erofs_unzip_io_sb, io));
+ kvfree(q[JQ_SUBMIT]);
return true;
}
static bool z_erofs_vle_submit_all(struct super_block *sb,
z_erofs_next_pcluster_t owned_head,
struct list_head *pagepool,
- struct z_erofs_unzip_io *fgq,
- bool force_fg)
+ struct z_erofs_decompressqueue *fgq,
+ bool *force_fg)
{
struct erofs_sb_info *const sbi = EROFS_SB(sb);
z_erofs_next_pcluster_t qtail[NR_JOBQUEUES];
- struct z_erofs_unzip_io *q[NR_JOBQUEUES];
+ struct z_erofs_decompressqueue *q[NR_JOBQUEUES];
struct bio *bio;
void *bi_private;
/* since bio will be NULL, no need to initialize last_index */
@@ -1198,7 +1179,9 @@ static bool z_erofs_vle_submit_all(struct super_block *sb,
force_submit = false;
bio = NULL;
nr_bios = 0;
- bi_private = jobqueueset_init(sb, qtail, q, fgq, force_fg);
+ bi_private = jobqueueset_init(sb, q, fgq, force_fg);
+ qtail[JQ_BYPASS] = &q[JQ_BYPASS]->head;
+ qtail[JQ_SUBMIT] = &q[JQ_SUBMIT]->head;
/* by default, all need io submission */
q[JQ_SUBMIT]->head = owned_head;
@@ -1274,10 +1257,10 @@ static bool z_erofs_vle_submit_all(struct super_block *sb,
if (bio)
submit_bio(bio);
- if (postsubmit_is_all_bypassed(q, nr_bios, force_fg))
+ if (postsubmit_is_all_bypassed(q, nr_bios, *force_fg))
return true;
- z_erofs_vle_unzip_kickoff(bi_private, nr_bios);
+ z_erofs_decompress_kickoff(q[JQ_SUBMIT], *force_fg, nr_bios);
return true;
}
@@ -1286,14 +1269,14 @@ static void z_erofs_submit_and_unzip(struct super_block *sb,
struct list_head *pagepool,
bool force_fg)
{
- struct z_erofs_unzip_io io[NR_JOBQUEUES];
+ struct z_erofs_decompressqueue io[NR_JOBQUEUES];
if (!z_erofs_vle_submit_all(sb, clt->owned_head,
- pagepool, io, force_fg))
+ pagepool, io, &force_fg))
return;
/* decompress no I/O pclusters immediately */
- z_erofs_vle_unzip_all(sb, &io[JQ_BYPASS], pagepool);
+ z_erofs_vle_unzip_all(&io[JQ_BYPASS], pagepool);
if (!force_fg)
return;
@@ -1303,7 +1286,7 @@ static void z_erofs_submit_and_unzip(struct super_block *sb,
!atomic_read(&io[JQ_SUBMIT].pending_bios));
/* let's synchronous decompression */
- z_erofs_vle_unzip_all(sb, &io[JQ_SUBMIT], pagepool);
+ z_erofs_vle_unzip_all(&io[JQ_SUBMIT], pagepool);
}
static int z_erofs_vle_normalaccess_readpage(struct file *file,
diff --git a/fs/erofs/zdata.h b/fs/erofs/zdata.h
index faf950189bd7..7824f5563a55 100644
--- a/fs/erofs/zdata.h
+++ b/fs/erofs/zdata.h
@@ -84,7 +84,8 @@ struct z_erofs_pcluster {
#define Z_EROFS_WORKGROUP_SIZE sizeof(struct z_erofs_pcluster)
-struct z_erofs_unzip_io {
+struct z_erofs_decompressqueue {
+ struct super_block *sb;
atomic_t pending_bios;
z_erofs_next_pcluster_t head;
@@ -94,11 +95,6 @@ struct z_erofs_unzip_io {
} u;
};
-struct z_erofs_unzip_io_sb {
- struct z_erofs_unzip_io io;
- struct super_block *sb;
-};
-
#define MNGD_MAPPING(sbi) ((sbi)->managed_cache->i_mapping)
static inline bool erofs_page_is_managed(const struct erofs_sb_info *sbi,
struct page *page)
--
2.17.1