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staging: erofs: simplify `z_erofs_vle_submit_all'
Previously, there are too many hacked stuffs such as `__FSIO_1', `lstgrp_noio', `lstgrp_io' out there in `z_erofs_vle_submit_all'. Revisit the whole process by properly introducing jobqueue to represent each type of queued workgroups, furthermore hide all of crazyness behind independent separated functions. After this patch, 2 independent jobqueues exist if managed cache is enabled, or 1 jobqueue if disabled. Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Gao Xiang
Greg Kroah-Hartman
parent
6afd227ca1
commit
7146a4f026
@ -1229,33 +1229,28 @@ out: /* the only exit (for tracing and debugging) */
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return page;
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}
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static inline struct z_erofs_vle_unzip_io *
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prepare_io_handler(struct super_block *sb,
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struct z_erofs_vle_unzip_io *io,
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bool background)
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static struct z_erofs_vle_unzip_io *
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jobqueue_init(struct super_block *sb,
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struct z_erofs_vle_unzip_io *io,
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bool foreground)
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{
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struct z_erofs_vle_unzip_io_sb *iosb;
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if (!background) {
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if (foreground) {
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/* waitqueue available for foreground io */
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BUG_ON(!io);
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DBG_BUGON(!io);
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init_waitqueue_head(&io->u.wait);
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atomic_set(&io->pending_bios, 0);
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goto out;
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}
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if (io)
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BUG();
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else {
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/* allocate extra io descriptor for background io */
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iosb = kvzalloc(sizeof(struct z_erofs_vle_unzip_io_sb),
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iosb = kvzalloc(sizeof(struct z_erofs_vle_unzip_io_sb),
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GFP_KERNEL | __GFP_NOFAIL);
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BUG_ON(!iosb);
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io = &iosb->io;
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}
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DBG_BUGON(!iosb);
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/* initialize fields in the allocated descriptor */
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io = &iosb->io;
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iosb->sb = sb;
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INIT_WORK(&io->u.work, z_erofs_vle_unzip_wq);
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out:
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@ -1263,27 +1258,105 @@ out:
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return io;
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}
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/* define workgroup jobqueue types */
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enum {
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#ifdef EROFS_FS_HAS_MANAGED_CACHE
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#define __FSIO_1 1
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JQ_BYPASS,
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#endif
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JQ_SUBMIT,
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NR_JOBQUEUES,
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};
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static void *jobqueueset_init(struct super_block *sb,
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z_erofs_vle_owned_workgrp_t qtail[],
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struct z_erofs_vle_unzip_io *q[],
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struct z_erofs_vle_unzip_io *fgq,
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bool forcefg)
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{
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#ifdef EROFS_FS_HAS_MANAGED_CACHE
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/*
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* if managed cache is enabled, bypass jobqueue is needed,
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* no need to read from device for all workgroups in this queue.
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*/
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q[JQ_BYPASS] = jobqueue_init(sb, fgq + JQ_BYPASS, true);
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qtail[JQ_BYPASS] = &q[JQ_BYPASS]->head;
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#endif
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q[JQ_SUBMIT] = jobqueue_init(sb, fgq + JQ_SUBMIT, forcefg);
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qtail[JQ_SUBMIT] = &q[JQ_SUBMIT]->head;
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return tagptr_cast_ptr(tagptr_fold(tagptr1_t, q[JQ_SUBMIT], !forcefg));
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}
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#ifdef EROFS_FS_HAS_MANAGED_CACHE
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static void move_to_bypass_jobqueue(struct z_erofs_vle_workgroup *grp,
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z_erofs_vle_owned_workgrp_t qtail[],
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z_erofs_vle_owned_workgrp_t owned_head)
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{
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z_erofs_vle_owned_workgrp_t *const submit_qtail = qtail[JQ_SUBMIT];
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z_erofs_vle_owned_workgrp_t *const bypass_qtail = qtail[JQ_BYPASS];
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DBG_BUGON(owned_head == Z_EROFS_VLE_WORKGRP_TAIL_CLOSED);
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if (owned_head == Z_EROFS_VLE_WORKGRP_TAIL)
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owned_head = Z_EROFS_VLE_WORKGRP_TAIL_CLOSED;
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WRITE_ONCE(grp->next, Z_EROFS_VLE_WORKGRP_TAIL_CLOSED);
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WRITE_ONCE(*submit_qtail, owned_head);
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WRITE_ONCE(*bypass_qtail, &grp->next);
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qtail[JQ_BYPASS] = &grp->next;
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}
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static bool postsubmit_is_all_bypassed(struct z_erofs_vle_unzip_io *q[],
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unsigned int nr_bios,
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bool force_fg)
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{
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/*
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* although background is preferred, no one is pending for submission.
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* don't issue workqueue for decompression but drop it directly instead.
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*/
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if (force_fg || nr_bios)
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return false;
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kvfree(container_of(q[JQ_SUBMIT],
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struct z_erofs_vle_unzip_io_sb,
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io));
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return true;
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}
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#else
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#define __FSIO_1 0
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static void move_to_bypass_jobqueue(struct z_erofs_vle_workgroup *grp,
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z_erofs_vle_owned_workgrp_t qtail[],
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z_erofs_vle_owned_workgrp_t owned_head)
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{
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/* impossible to bypass submission for managed cache disabled */
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DBG_BUGON(1);
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}
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static bool postsubmit_is_all_bypassed(struct z_erofs_vle_unzip_io *q[],
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unsigned int nr_bios,
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bool force_fg)
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{
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/* bios should be >0 if managed cache is disabled */
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DBG_BUGON(!nr_bios);
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return false;
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}
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#endif
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static bool z_erofs_vle_submit_all(struct super_block *sb,
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z_erofs_vle_owned_workgrp_t owned_head,
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struct list_head *pagepool,
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struct z_erofs_vle_unzip_io *fg_io,
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struct z_erofs_vle_unzip_io *fgq,
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bool force_fg)
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{
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struct erofs_sb_info *const sbi = EROFS_SB(sb);
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const unsigned int clusterpages = erofs_clusterpages(sbi);
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const gfp_t gfp = GFP_NOFS;
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#ifdef EROFS_FS_HAS_MANAGED_CACHE
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struct z_erofs_vle_workgroup *lstgrp_noio = NULL, *lstgrp_io = NULL;
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#endif
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struct z_erofs_vle_unzip_io *ios[1 + __FSIO_1];
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z_erofs_vle_owned_workgrp_t qtail[NR_JOBQUEUES];
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struct z_erofs_vle_unzip_io *q[NR_JOBQUEUES];
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struct bio *bio;
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tagptr1_t bi_private;
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void *bi_private;
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/* since bio will be NULL, no need to initialize last_index */
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pgoff_t uninitialized_var(last_index);
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bool force_submit = false;
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@ -1292,28 +1365,13 @@ static bool z_erofs_vle_submit_all(struct super_block *sb,
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if (unlikely(owned_head == Z_EROFS_VLE_WORKGRP_TAIL))
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return false;
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/*
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* force_fg == 1, (io, fg_io[0]) no io, (io, fg_io[1]) need submit io
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* force_fg == 0, (io, fg_io[0]) no io; (io[1], bg_io) need submit io
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*/
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#ifdef EROFS_FS_HAS_MANAGED_CACHE
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ios[0] = prepare_io_handler(sb, fg_io + 0, false);
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#endif
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if (force_fg) {
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ios[__FSIO_1] = prepare_io_handler(sb, fg_io + __FSIO_1, false);
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bi_private = tagptr_fold(tagptr1_t, ios[__FSIO_1], 0);
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} else {
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ios[__FSIO_1] = prepare_io_handler(sb, NULL, true);
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bi_private = tagptr_fold(tagptr1_t, ios[__FSIO_1], 1);
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}
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nr_bios = 0;
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force_submit = false;
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bio = NULL;
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nr_bios = 0;
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bi_private = jobqueueset_init(sb, qtail, q, fgq, force_fg);
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/* by default, all need io submission */
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ios[__FSIO_1]->head = owned_head;
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q[JQ_SUBMIT]->head = owned_head;
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do {
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struct z_erofs_vle_workgroup *grp;
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@ -1353,8 +1411,9 @@ submit_bio_retry:
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if (!bio) {
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bio = erofs_grab_bio(sb, first_index + i,
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BIO_MAX_PAGES, z_erofs_vle_read_endio, true);
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bio->bi_private = tagptr_cast_ptr(bi_private);
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BIO_MAX_PAGES,
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z_erofs_vle_read_endio, true);
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bio->bi_private = bi_private;
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++nr_bios;
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}
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@ -1369,47 +1428,19 @@ skippage:
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if (++i < clusterpages)
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goto repeat;
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#ifdef EROFS_FS_HAS_MANAGED_CACHE
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if (bypass < clusterpages) {
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lstgrp_io = grp;
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} else {
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z_erofs_vle_owned_workgrp_t iogrp_next =
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owned_head == Z_EROFS_VLE_WORKGRP_TAIL ?
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Z_EROFS_VLE_WORKGRP_TAIL_CLOSED :
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owned_head;
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if (!lstgrp_io)
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ios[1]->head = iogrp_next;
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else
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WRITE_ONCE(lstgrp_io->next, iogrp_next);
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if (!lstgrp_noio)
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ios[0]->head = &grp->next;
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else
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WRITE_ONCE(lstgrp_noio->next, grp);
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lstgrp_noio = grp;
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}
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#endif
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if (bypass < clusterpages)
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qtail[JQ_SUBMIT] = &grp->next;
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else
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move_to_bypass_jobqueue(grp, qtail, owned_head);
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} while (owned_head != Z_EROFS_VLE_WORKGRP_TAIL);
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if (bio)
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__submit_bio(bio, REQ_OP_READ, 0);
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#ifndef EROFS_FS_HAS_MANAGED_CACHE
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BUG_ON(!nr_bios);
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#else
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if (lstgrp_noio)
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WRITE_ONCE(lstgrp_noio->next, Z_EROFS_VLE_WORKGRP_TAIL_CLOSED);
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if (!force_fg && !nr_bios) {
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kvfree(container_of(ios[1],
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struct z_erofs_vle_unzip_io_sb, io));
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if (postsubmit_is_all_bypassed(q, nr_bios, force_fg))
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return true;
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}
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#endif
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z_erofs_vle_unzip_kickoff(tagptr_cast_ptr(bi_private), nr_bios);
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z_erofs_vle_unzip_kickoff(bi_private, nr_bios);
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return true;
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}
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@ -1418,23 +1449,23 @@ static void z_erofs_submit_and_unzip(struct z_erofs_vle_frontend *f,
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bool force_fg)
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{
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struct super_block *sb = f->inode->i_sb;
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struct z_erofs_vle_unzip_io io[1 + __FSIO_1];
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struct z_erofs_vle_unzip_io io[NR_JOBQUEUES];
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if (!z_erofs_vle_submit_all(sb, f->owned_head, pagepool, io, force_fg))
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return;
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#ifdef EROFS_FS_HAS_MANAGED_CACHE
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z_erofs_vle_unzip_all(sb, &io[0], pagepool);
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z_erofs_vle_unzip_all(sb, &io[JQ_BYPASS], pagepool);
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#endif
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if (!force_fg)
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return;
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/* wait until all bios are completed */
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wait_event(io[__FSIO_1].u.wait,
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!atomic_read(&io[__FSIO_1].pending_bios));
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wait_event(io[JQ_SUBMIT].u.wait,
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!atomic_read(&io[JQ_SUBMIT].pending_bios));
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/* let's synchronous decompression */
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z_erofs_vle_unzip_all(sb, &io[__FSIO_1], pagepool);
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z_erofs_vle_unzip_all(sb, &io[JQ_SUBMIT], pagepool);
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}
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static int z_erofs_vle_normalaccess_readpage(struct file *file,
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