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Date: Wed, 29 May 2019 20:31:15 -0700
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: linux-kernel@...r.kernel.org,
linux-f2fs-devel@...ts.sourceforge.net
Cc: Jaegeuk Kim <jaegeuk@...nel.org>
Subject: [PATCH] f2fs: add a rw_sem to cover quota flag changes
thread 1: thread 2:
writeback checkpoint
set QUOTA_NEED_FLUSH
clear QUOTA_NEED_FLUSH
f2fs_dquot_commit
dquot_commit
clear_dquot_dirty
f2fs_quota_sync
dquot_writeback_dquots
nothing to commit
commit_dqblk
quota_write
f2fs_quota_write
waiting for f2fs_lock_op()
pass __need_flush_quota
(no F2FS_DIRTY_QDATA)
-> up-to-date quota is not written
Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
---
fs/f2fs/checkpoint.c | 26 ++++++++++++++++----------
fs/f2fs/f2fs.h | 1 +
fs/f2fs/super.c | 27 ++++++++++++++++++++++-----
3 files changed, 39 insertions(+), 15 deletions(-)
diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index 89825261d474..cf3b15c963d2 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -1131,17 +1131,23 @@ static void __prepare_cp_block(struct f2fs_sb_info *sbi)
static bool __need_flush_quota(struct f2fs_sb_info *sbi)
{
+ bool ret = false;
+
+ down_write(&sbi->quota_sem);
if (!is_journalled_quota(sbi))
- return false;
- if (is_sbi_flag_set(sbi, SBI_QUOTA_SKIP_FLUSH))
- return false;
- if (is_sbi_flag_set(sbi, SBI_QUOTA_NEED_REPAIR))
- return false;
- if (is_sbi_flag_set(sbi, SBI_QUOTA_NEED_FLUSH))
- return true;
- if (get_pages(sbi, F2FS_DIRTY_QDATA))
- return true;
- return false;
+ ret = false;
+ else if (is_sbi_flag_set(sbi, SBI_QUOTA_SKIP_FLUSH))
+ ret = false;
+ else if (is_sbi_flag_set(sbi, SBI_QUOTA_NEED_REPAIR))
+ ret = false;
+ else if (is_sbi_flag_set(sbi, SBI_QUOTA_NEED_FLUSH))
+ ret = true;
+ else if (get_pages(sbi, F2FS_DIRTY_QDATA))
+ ret = true;
+ else
+ ret = false;
+ up_write(&sbi->quota_sem);
+ return ret;
}
/*
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 9b3d9977cd1e..692c0922f5b2 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1250,6 +1250,7 @@ struct f2fs_sb_info {
block_t unusable_block_count; /* # of blocks saved by last cp */
unsigned int nquota_files; /* # of quota sysfile */
+ struct rw_semaphore quota_sem; /* blocking cp for flags */
/* # of pages, see count_type */
atomic_t nr_pages[NR_COUNT_TYPE];
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 912e2619d581..5ddf5e97ee60 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -1944,7 +1944,10 @@ int f2fs_quota_sync(struct super_block *sb, int type)
int cnt;
int ret;
+ down_read(&sbi->quota_sem);
ret = dquot_writeback_dquots(sb, type);
+ up_read(&sbi->quota_sem);
+
if (ret)
goto out;
@@ -2074,32 +2077,40 @@ static void f2fs_truncate_quota_inode_pages(struct super_block *sb)
static int f2fs_dquot_commit(struct dquot *dquot)
{
+ struct f2fs_sb_info *sbi = F2FS_SB(dquot->dq_sb);
int ret;
+ down_read(&sbi->quota_sem);
ret = dquot_commit(dquot);
if (ret < 0)
- set_sbi_flag(F2FS_SB(dquot->dq_sb), SBI_QUOTA_NEED_REPAIR);
+ set_sbi_flag(sbi, SBI_QUOTA_NEED_REPAIR);
+ up_read(&sbi->quota_sem);
return ret;
}
static int f2fs_dquot_acquire(struct dquot *dquot)
{
+ struct f2fs_sb_info *sbi = F2FS_SB(dquot->dq_sb);
int ret;
+ down_read(&sbi->quota_sem);
ret = dquot_acquire(dquot);
if (ret < 0)
- set_sbi_flag(F2FS_SB(dquot->dq_sb), SBI_QUOTA_NEED_REPAIR);
-
+ set_sbi_flag(sbi, SBI_QUOTA_NEED_REPAIR);
+ up_read(&sbi->quota_sem);
return ret;
}
static int f2fs_dquot_release(struct dquot *dquot)
{
+ struct f2fs_sb_info *sbi = F2FS_SB(dquot->dq_sb);
int ret;
+ down_read(&sbi->quota_sem);
ret = dquot_release(dquot);
if (ret < 0)
- set_sbi_flag(F2FS_SB(dquot->dq_sb), SBI_QUOTA_NEED_REPAIR);
+ set_sbi_flag(sbi, SBI_QUOTA_NEED_REPAIR);
+ up_read(&sbi->quota_sem);
return ret;
}
@@ -2109,22 +2120,27 @@ static int f2fs_dquot_mark_dquot_dirty(struct dquot *dquot)
struct f2fs_sb_info *sbi = F2FS_SB(sb);
int ret;
+ down_read(&sbi->quota_sem);
ret = dquot_mark_dquot_dirty(dquot);
/* if we are using journalled quota */
if (is_journalled_quota(sbi))
set_sbi_flag(sbi, SBI_QUOTA_NEED_FLUSH);
+ up_read(&sbi->quota_sem);
return ret;
}
static int f2fs_dquot_commit_info(struct super_block *sb, int type)
{
+ struct f2fs_sb_info *sbi = F2FS_SB(sb);
int ret;
+ down_read(&sbi->quota_sem);
ret = dquot_commit_info(sb, type);
if (ret < 0)
- set_sbi_flag(F2FS_SB(sb), SBI_QUOTA_NEED_REPAIR);
+ set_sbi_flag(sbi, SBI_QUOTA_NEED_REPAIR);
+ up_read(&sbi->quota_sem);
return ret;
}
@@ -3233,6 +3249,7 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
}
init_rwsem(&sbi->cp_rwsem);
+ init_rwsem(&sbi->quota_sem);
init_waitqueue_head(&sbi->cp_wait);
init_sb_info(sbi);
--
2.19.0.605.g01d371f741-goog
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