f2fs: introduce DEFAULT_IO_TIMEOUT
As Geert Uytterhoeven reported:
for parameter HZ/50 in congestion_wait(BLK_RW_ASYNC, HZ/50);
On some platforms, HZ can be less than 50, then unexpected 0 timeout
jiffies will be set in congestion_wait().
This patch introduces a macro DEFAULT_IO_TIMEOUT to wrap a determinate
value with msecs_to_jiffies(20) to instead HZ/50 to avoid such issue.
Quoted from Geert Uytterhoeven:
"A timeout of HZ means 1 second.
HZ/50 means 20 ms, but has the risk of being zero, if HZ < 50.
If you want to use a timeout of 20 ms, you best use msecs_to_jiffies(20),
as that takes care of the special cases, and never returns 0."
Signed-off-by: Chao Yu <[email protected]>
Signed-off-by: Jaegeuk Kim <[email protected]>
diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index 0dea31f..46fc9c1 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -1260,7 +1260,7 @@ void f2fs_wait_on_all_pages(struct f2fs_sb_info *sbi, int type)
if (unlikely(f2fs_cp_error(sbi)))
break;
- io_schedule_timeout(HZ/50);
+ io_schedule_timeout(DEFAULT_IO_TIMEOUT);
}
finish_wait(&sbi->cp_wait, &wait);
}
diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
index 5ef7d7c..7489338 100644
--- a/fs/f2fs/compress.c
+++ b/fs/f2fs/compress.c
@@ -988,7 +988,8 @@ static int f2fs_write_raw_pages(struct compress_ctx *cc,
} else if (ret == -EAGAIN) {
ret = 0;
cond_resched();
- congestion_wait(BLK_RW_ASYNC, HZ/50);
+ congestion_wait(BLK_RW_ASYNC,
+ DEFAULT_IO_TIMEOUT);
lock_page(cc->rpages[i]);
clear_page_dirty_for_io(cc->rpages[i]);
goto retry_write;
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 9fba196..43d7057 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -2317,7 +2317,7 @@ int f2fs_encrypt_one_page(struct f2fs_io_info *fio)
/* flush pending IOs and wait for a while in the ENOMEM case */
if (PTR_ERR(fio->encrypted_page) == -ENOMEM) {
f2fs_flush_merged_writes(fio->sbi);
- congestion_wait(BLK_RW_ASYNC, HZ/50);
+ congestion_wait(BLK_RW_ASYNC, DEFAULT_IO_TIMEOUT);
gfp_flags |= __GFP_NOFAIL;
goto retry_encrypt;
}
@@ -2908,7 +2908,7 @@ static int f2fs_write_cache_pages(struct address_space *mapping,
if (wbc->sync_mode == WB_SYNC_ALL) {
cond_resched();
congestion_wait(BLK_RW_ASYNC,
- HZ/50);
+ DEFAULT_IO_TIMEOUT);
goto retry_write;
}
goto next;
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index ef3ec65..241a87d 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -558,6 +558,9 @@ enum {
#define DEFAULT_RETRY_IO_COUNT 8 /* maximum retry read IO count */
+/* congestion wait timeout value, default: 20ms */
+#define DEFAULT_IO_TIMEOUT (msecs_to_jiffies(20))
+
/* maximum retry quota flush count */
#define DEFAULT_RETRY_QUOTA_FLUSH_COUNT 8
diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index 0dfdec4..f6958ae 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -977,7 +977,8 @@ static int move_data_page(struct inode *inode, block_t bidx, int gc_type,
if (err) {
clear_cold_data(page);
if (err == -ENOMEM) {
- congestion_wait(BLK_RW_ASYNC, HZ/50);
+ congestion_wait(BLK_RW_ASYNC,
+ DEFAULT_IO_TIMEOUT);
goto retry;
}
if (is_dirty)
diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
index 45aff90..44e08bf 100644
--- a/fs/f2fs/inode.c
+++ b/fs/f2fs/inode.c
@@ -535,7 +535,7 @@ struct inode *f2fs_iget_retry(struct super_block *sb, unsigned long ino)
inode = f2fs_iget(sb, ino);
if (IS_ERR(inode)) {
if (PTR_ERR(inode) == -ENOMEM) {
- congestion_wait(BLK_RW_ASYNC, HZ/50);
+ congestion_wait(BLK_RW_ASYNC, DEFAULT_IO_TIMEOUT);
goto retry;
}
}
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index cc26467..aea9915 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -2599,7 +2599,7 @@ int f2fs_recover_inode_page(struct f2fs_sb_info *sbi, struct page *page)
retry:
ipage = f2fs_grab_cache_page(NODE_MAPPING(sbi), ino, false);
if (!ipage) {
- congestion_wait(BLK_RW_ASYNC, HZ/50);
+ congestion_wait(BLK_RW_ASYNC, DEFAULT_IO_TIMEOUT);
goto retry;
}
diff --git a/fs/f2fs/recovery.c b/fs/f2fs/recovery.c
index 348e8d4..dd804c0 100644
--- a/fs/f2fs/recovery.c
+++ b/fs/f2fs/recovery.c
@@ -534,7 +534,7 @@ static int do_recover_data(struct f2fs_sb_info *sbi, struct inode *inode,
err = f2fs_get_dnode_of_data(&dn, start, ALLOC_NODE);
if (err) {
if (err == -ENOMEM) {
- congestion_wait(BLK_RW_ASYNC, HZ/50);
+ congestion_wait(BLK_RW_ASYNC, DEFAULT_IO_TIMEOUT);
goto retry_dn;
}
goto out;
@@ -617,7 +617,8 @@ static int do_recover_data(struct f2fs_sb_info *sbi, struct inode *inode,
err = check_index_in_prev_nodes(sbi, dest, &dn);
if (err) {
if (err == -ENOMEM) {
- congestion_wait(BLK_RW_ASYNC, HZ/50);
+ congestion_wait(BLK_RW_ASYNC,
+ DEFAULT_IO_TIMEOUT);
goto retry_prev;
}
goto err;
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 04156df..a2beb0e 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -245,7 +245,8 @@ static int __revoke_inmem_pages(struct inode *inode,
LOOKUP_NODE);
if (err) {
if (err == -ENOMEM) {
- congestion_wait(BLK_RW_ASYNC, HZ/50);
+ congestion_wait(BLK_RW_ASYNC,
+ DEFAULT_IO_TIMEOUT);
cond_resched();
goto retry;
}
@@ -312,7 +313,7 @@ void f2fs_drop_inmem_pages_all(struct f2fs_sb_info *sbi, bool gc_failure)
skip:
iput(inode);
}
- congestion_wait(BLK_RW_ASYNC, HZ/50);
+ congestion_wait(BLK_RW_ASYNC, DEFAULT_IO_TIMEOUT);
cond_resched();
if (gc_failure) {
if (++looped >= count)
@@ -415,7 +416,8 @@ static int __f2fs_commit_inmem_pages(struct inode *inode)
err = f2fs_do_write_data_page(&fio);
if (err) {
if (err == -ENOMEM) {
- congestion_wait(BLK_RW_ASYNC, HZ/50);
+ congestion_wait(BLK_RW_ASYNC,
+ DEFAULT_IO_TIMEOUT);
cond_resched();
goto retry;
}
@@ -2801,7 +2803,7 @@ static unsigned int __issue_discard_cmd_range(struct f2fs_sb_info *sbi,
blk_finish_plug(&plug);
mutex_unlock(&dcc->cmd_lock);
trimmed += __wait_all_discard_cmd(sbi, NULL);
- congestion_wait(BLK_RW_ASYNC, HZ/50);
+ congestion_wait(BLK_RW_ASYNC, DEFAULT_IO_TIMEOUT);
goto next;
}
skip:
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index cdcb80f..36539af 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -1885,7 +1885,8 @@ static ssize_t f2fs_quota_read(struct super_block *sb, int type, char *data,
page = read_cache_page_gfp(mapping, blkidx, GFP_NOFS);
if (IS_ERR(page)) {
if (PTR_ERR(page) == -ENOMEM) {
- congestion_wait(BLK_RW_ASYNC, HZ/50);
+ congestion_wait(BLK_RW_ASYNC,
+ DEFAULT_IO_TIMEOUT);
goto repeat;
}
set_sbi_flag(F2FS_SB(sb), SBI_QUOTA_NEED_REPAIR);
@@ -1939,7 +1940,8 @@ static ssize_t f2fs_quota_write(struct super_block *sb, int type,
&page, NULL);
if (unlikely(err)) {
if (err == -ENOMEM) {
- congestion_wait(BLK_RW_ASYNC, HZ/50);
+ congestion_wait(BLK_RW_ASYNC,
+ DEFAULT_IO_TIMEOUT);
goto retry;
}
set_sbi_flag(F2FS_SB(sb), SBI_QUOTA_NEED_REPAIR);
