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Message-ID: <20170309224937.GB4125@jaegeuk.local>
Date: Thu, 9 Mar 2017 14:49:37 -0800
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [PATCH v2] f2fs: allocate a bio for discarding when actually
issuing it
Change log from v1:
o change error handling flows
>From 58bb056dfa207a0dc9b9432dcf78758a7784144a Mon Sep 17 00:00:00 2001
From: Jaegeuk Kim <jaegeuk@...nel.org>
Date: Tue, 7 Mar 2017 18:02:02 -0800
Subject: [PATCH] f2fs: allocate a bio for discarding when actually issuing it
Let's allocate a bio when issuing discard commands later.
Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
---
fs/f2fs/f2fs.h | 4 +-
fs/f2fs/segment.c | 136 +++++++++++++++++++++++++++++-------------------------
2 files changed, 76 insertions(+), 64 deletions(-)
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index a58c2e43bd2a..870bb4d9bc65 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -197,10 +197,12 @@ enum {
struct discard_cmd {
struct list_head list; /* command list */
struct completion wait; /* compleation */
+ struct block_device *bdev; /* bdev */
block_t lstart; /* logical start address */
+ block_t start; /* actual start address in dev */
block_t len; /* length */
- struct bio *bio; /* bio */
int state; /* state */
+ int error; /* bio error */
};
struct discard_cmd_control {
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 50c65cc4645a..2d99fb0d44c9 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -636,7 +636,8 @@ static void locate_dirty_segment(struct f2fs_sb_info *sbi, unsigned int segno)
}
static void __add_discard_cmd(struct f2fs_sb_info *sbi,
- struct bio *bio, block_t lstart, block_t len)
+ struct block_device *bdev, block_t lstart,
+ block_t start, block_t len)
{
struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
struct list_head *cmd_list = &(dcc->discard_cmd_list);
@@ -644,11 +645,12 @@ static void __add_discard_cmd(struct f2fs_sb_info *sbi,
dc = f2fs_kmem_cache_alloc(discard_cmd_slab, GFP_NOFS);
INIT_LIST_HEAD(&dc->list);
- dc->bio = bio;
- bio->bi_private = dc;
+ dc->bdev = bdev;
dc->lstart = lstart;
+ dc->start = start;
dc->len = len;
dc->state = D_PREP;
+ dc->error = 0;
init_completion(&dc->wait);
mutex_lock(&dcc->cmd_lock);
@@ -658,22 +660,74 @@ static void __add_discard_cmd(struct f2fs_sb_info *sbi,
static void __remove_discard_cmd(struct f2fs_sb_info *sbi, struct discard_cmd *dc)
{
- int err = dc->bio->bi_error;
-
if (dc->state == D_DONE)
atomic_dec(&(SM_I(sbi)->dcc_info->submit_discard));
- if (err == -EOPNOTSUPP)
- err = 0;
+ if (dc->error == -EOPNOTSUPP)
+ dc->error = 0;
- if (err)
+ if (dc->error)
f2fs_msg(sbi->sb, KERN_INFO,
- "Issue discard failed, ret: %d", err);
- bio_put(dc->bio);
+ "Issue discard failed, ret: %d", dc->error);
list_del(&dc->list);
kmem_cache_free(discard_cmd_slab, dc);
}
+static void f2fs_submit_discard_endio(struct bio *bio)
+{
+ struct discard_cmd *dc = (struct discard_cmd *)bio->bi_private;
+
+ complete(&dc->wait);
+ dc->error = bio->bi_error;
+ dc->state = D_DONE;
+ bio_put(bio);
+}
+
+/* this function is copied from blkdev_issue_discard from block/blk-lib.c */
+static void __submit_discard_cmd(struct f2fs_sb_info *sbi,
+ struct discard_cmd *dc)
+{
+ struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
+ struct bio *bio = NULL;
+
+ if (dc->state != D_PREP)
+ return;
+
+ dc->error = __blkdev_issue_discard(dc->bdev,
+ SECTOR_FROM_BLOCK(dc->start),
+ SECTOR_FROM_BLOCK(dc->len),
+ GFP_NOFS, 0, &bio);
+ if (!dc->error) {
+ if (bio) {
+ bio->bi_private = dc;
+ bio->bi_end_io = f2fs_submit_discard_endio;
+ bio->bi_opf |= REQ_SYNC;
+ submit_bio(bio);
+ }
+ dc->state = D_SUBMIT;
+ atomic_inc(&dcc->submit_discard);
+ } else {
+ __remove_discard_cmd(sbi, dc);
+ }
+}
+
+static int __queue_discard_cmd(struct f2fs_sb_info *sbi,
+ struct block_device *bdev, block_t blkstart, block_t blklen)
+{
+ block_t lblkstart = blkstart;
+
+ trace_f2fs_issue_discard(bdev, blkstart, blklen);
+
+ if (sbi->s_ndevs) {
+ int devi = f2fs_target_device_index(sbi, blkstart);
+
+ blkstart -= FDEV(devi).start_blk;
+ }
+ __add_discard_cmd(sbi, bdev, lblkstart, blkstart, blklen);
+ wake_up(&SM_I(sbi)->dcc_info->discard_wait_queue);
+ return 0;
+}
+
/* This should be covered by global mutex, &sit_i->sentry_lock */
void f2fs_wait_discard_bio(struct f2fs_sb_info *sbi, block_t blkaddr)
{
@@ -689,11 +743,7 @@ void f2fs_wait_discard_bio(struct f2fs_sb_info *sbi, block_t blkaddr)
list_for_each_entry_safe(dc, tmp, wait_list, list) {
if (blkaddr == NULL_ADDR) {
- if (dc->state == D_PREP) {
- dc->state = D_SUBMIT;
- submit_bio(dc->bio);
- atomic_inc(&dcc->submit_discard);
- }
+ __submit_discard_cmd(sbi, dc);
continue;
}
@@ -716,14 +766,6 @@ void f2fs_wait_discard_bio(struct f2fs_sb_info *sbi, block_t blkaddr)
mutex_unlock(&dcc->cmd_lock);
}
-static void f2fs_submit_discard_endio(struct bio *bio)
-{
- struct discard_cmd *dc = (struct discard_cmd *)bio->bi_private;
-
- complete(&dc->wait);
- dc->state = D_DONE;
-}
-
static int issue_discard_thread(void *data)
{
struct f2fs_sb_info *sbi = data;
@@ -741,15 +783,13 @@ static int issue_discard_thread(void *data)
mutex_lock(&dcc->cmd_lock);
list_for_each_entry_safe(dc, tmp, cmd_list, list) {
- if (dc->state == D_PREP) {
- dc->state = D_SUBMIT;
- submit_bio(dc->bio);
- atomic_inc(&dcc->submit_discard);
- if (iter++ > DISCARD_ISSUE_RATE)
- break;
- } else if (dc->state == D_DONE) {
+
+ __submit_discard_cmd(sbi, dc);
+
+ if (dc->state == D_PREP && iter++ > DISCARD_ISSUE_RATE)
+ break;
+ if (dc->state == D_DONE)
__remove_discard_cmd(sbi, dc);
- }
}
mutex_unlock(&dcc->cmd_lock);
@@ -763,36 +803,6 @@ static int issue_discard_thread(void *data)
goto repeat;
}
-
-/* this function is copied from blkdev_issue_discard from block/blk-lib.c */
-static int __f2fs_issue_discard_async(struct f2fs_sb_info *sbi,
- struct block_device *bdev, block_t blkstart, block_t blklen)
-{
- struct bio *bio = NULL;
- block_t lblkstart = blkstart;
- int err;
-
- trace_f2fs_issue_discard(bdev, blkstart, blklen);
-
- if (sbi->s_ndevs) {
- int devi = f2fs_target_device_index(sbi, blkstart);
-
- blkstart -= FDEV(devi).start_blk;
- }
- err = __blkdev_issue_discard(bdev,
- SECTOR_FROM_BLOCK(blkstart),
- SECTOR_FROM_BLOCK(blklen),
- GFP_NOFS, 0, &bio);
- if (!err && bio) {
- bio->bi_end_io = f2fs_submit_discard_endio;
- bio->bi_opf |= REQ_SYNC;
-
- __add_discard_cmd(sbi, bio, lblkstart, blklen);
- wake_up(&SM_I(sbi)->dcc_info->discard_wait_queue);
- }
- return err;
-}
-
#ifdef CONFIG_BLK_DEV_ZONED
static int __f2fs_issue_discard_zone(struct f2fs_sb_info *sbi,
struct block_device *bdev, block_t blkstart, block_t blklen)
@@ -816,7 +826,7 @@ static int __f2fs_issue_discard_zone(struct f2fs_sb_info *sbi,
case BLK_ZONE_TYPE_CONVENTIONAL:
if (!blk_queue_discard(bdev_get_queue(bdev)))
return 0;
- return __f2fs_issue_discard_async(sbi, bdev, lblkstart, blklen);
+ return __queue_discard_cmd(sbi, bdev, lblkstart, blklen);
case BLK_ZONE_TYPE_SEQWRITE_REQ:
case BLK_ZONE_TYPE_SEQWRITE_PREF:
sector = SECTOR_FROM_BLOCK(blkstart);
@@ -848,7 +858,7 @@ static int __issue_discard_async(struct f2fs_sb_info *sbi,
bdev_zoned_model(bdev) != BLK_ZONED_NONE)
return __f2fs_issue_discard_zone(sbi, bdev, blkstart, blklen);
#endif
- return __f2fs_issue_discard_async(sbi, bdev, blkstart, blklen);
+ return __queue_discard_cmd(sbi, bdev, blkstart, blklen);
}
static int f2fs_issue_discard(struct f2fs_sb_info *sbi,
--
2.11.0
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