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Date: Thu, 27 Feb 2020 19:30:03 +0800
From: Chao Yu <yuchao0@...wei.com>
To: <jaegeuk@...nel.org>
CC: <linux-f2fs-devel@...ts.sourceforge.net>,
<linux-kernel@...r.kernel.org>, <chao@...nel.org>,
Chao Yu <yuchao0@...wei.com>
Subject: [PATCH 1/3] f2fs: cover last_disk_size update with spinlock
This change solves below hangtask issue:
INFO: task kworker/u16:1:58 blocked for more than 122 seconds.
Not tainted 5.6.0-rc2-00590-g9983bdae4974e #11
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/u16:1 D 0 58 2 0x00000000
Workqueue: writeback wb_workfn (flush-179:0)
Backtrace:
(__schedule) from [<c0913234>] (schedule+0x78/0xf4)
(schedule) from [<c017ec74>] (rwsem_down_write_slowpath+0x24c/0x4c0)
(rwsem_down_write_slowpath) from [<c0915f2c>] (down_write+0x6c/0x70)
(down_write) from [<c0435b80>] (f2fs_write_single_data_page+0x608/0x7ac)
(f2fs_write_single_data_page) from [<c0435fd8>] (f2fs_write_cache_pages+0x2b4/0x7c4)
(f2fs_write_cache_pages) from [<c043682c>] (f2fs_write_data_pages+0x344/0x35c)
(f2fs_write_data_pages) from [<c0267ee8>] (do_writepages+0x3c/0xd4)
(do_writepages) from [<c0310cbc>] (__writeback_single_inode+0x44/0x454)
(__writeback_single_inode) from [<c03112d0>] (writeback_sb_inodes+0x204/0x4b0)
(writeback_sb_inodes) from [<c03115cc>] (__writeback_inodes_wb+0x50/0xe4)
(__writeback_inodes_wb) from [<c03118f4>] (wb_writeback+0x294/0x338)
(wb_writeback) from [<c0312dac>] (wb_workfn+0x35c/0x54c)
(wb_workfn) from [<c014f2b8>] (process_one_work+0x214/0x544)
(process_one_work) from [<c014f634>] (worker_thread+0x4c/0x574)
(worker_thread) from [<c01564fc>] (kthread+0x144/0x170)
(kthread) from [<c01010e8>] (ret_from_fork+0x14/0x2c)
Reported-and-tested-by: Ondřej Jirman <megi@....cz>
Signed-off-by: Chao Yu <yuchao0@...wei.com>
---
fs/f2fs/compress.c | 4 ++--
fs/f2fs/data.c | 4 ++--
fs/f2fs/f2fs.h | 5 +++--
fs/f2fs/file.c | 4 ++--
fs/f2fs/super.c | 1 +
5 files changed, 10 insertions(+), 8 deletions(-)
diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
index 7e220ec8f843..10a8b3b40051 100644
--- a/fs/f2fs/compress.c
+++ b/fs/f2fs/compress.c
@@ -897,10 +897,10 @@ static int f2fs_write_compressed_pages(struct compress_ctx *cc,
f2fs_put_dnode(&dn);
f2fs_unlock_op(sbi);
- down_write(&fi->i_sem);
+ spin_lock(&fi->i_size_lock);
if (fi->last_disk_size < psize)
fi->last_disk_size = psize;
- up_write(&fi->i_sem);
+ spin_unlock(&fi->i_size_lock);
f2fs_put_rpages(cc);
f2fs_destroy_compress_ctx(cc);
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 081e172fa130..4249296a71f9 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -2643,10 +2643,10 @@ int f2fs_write_single_data_page(struct page *page, int *submitted,
if (err) {
file_set_keep_isize(inode);
} else {
- down_write(&F2FS_I(inode)->i_sem);
+ spin_lock(&F2FS_I(inode)->i_size_lock);
if (F2FS_I(inode)->last_disk_size < psize)
F2FS_I(inode)->last_disk_size = psize;
- up_write(&F2FS_I(inode)->i_sem);
+ spin_unlock(&F2FS_I(inode)->i_size_lock);
}
done:
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 4a02edc2454b..1a8af2020e72 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -701,6 +701,7 @@ struct f2fs_inode_info {
struct task_struct *cp_task; /* separate cp/wb IO stats*/
nid_t i_xattr_nid; /* node id that contains xattrs */
loff_t last_disk_size; /* lastly written file size */
+ spinlock_t i_size_lock; /* protect last_disk_size */
#ifdef CONFIG_QUOTA
struct dquot *i_dquot[MAXQUOTAS];
@@ -2882,9 +2883,9 @@ static inline bool f2fs_skip_inode_update(struct inode *inode, int dsync)
if (!f2fs_is_time_consistent(inode))
return false;
- down_read(&F2FS_I(inode)->i_sem);
+ spin_lock(&F2FS_I(inode)->i_size_lock);
ret = F2FS_I(inode)->last_disk_size == i_size_read(inode);
- up_read(&F2FS_I(inode)->i_sem);
+ spin_unlock(&F2FS_I(inode)->i_size_lock);
return ret;
}
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index b8f01ee9d698..40ed78026a25 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -931,10 +931,10 @@ int f2fs_setattr(struct dentry *dentry, struct iattr *attr)
if (err)
return err;
- down_write(&F2FS_I(inode)->i_sem);
+ spin_lock(&F2FS_I(inode)->i_size_lock);
inode->i_mtime = inode->i_ctime = current_time(inode);
F2FS_I(inode)->last_disk_size = i_size_read(inode);
- up_write(&F2FS_I(inode)->i_sem);
+ spin_unlock(&F2FS_I(inode)->i_size_lock);
}
__setattr_copy(inode, attr);
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 0b16204d3b7d..2d0e5d1269f5 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -957,6 +957,7 @@ static struct inode *f2fs_alloc_inode(struct super_block *sb)
/* Initialize f2fs-specific inode info */
atomic_set(&fi->dirty_pages, 0);
init_rwsem(&fi->i_sem);
+ spin_lock_init(&fi->i_size_lock);
INIT_LIST_HEAD(&fi->dirty_list);
INIT_LIST_HEAD(&fi->gdirty_list);
INIT_LIST_HEAD(&fi->inmem_ilist);
--
2.18.0.rc1
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