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f2fs: change to use rwsem for cp_mutex

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Use rwsem to ensure serialization of the callers and to avoid
starvation of high priority tasks, when the system is under
heavy IO workload.

Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Sahitya Tummala
2020-11-23 10:58:32 +05:30
committed by Jaegeuk Kim
parent 2ea369bdcc
commit cd21cc9af7
5 changed files with 10 additions and 10 deletions
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4
fs/f2fs/recovery.c
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@@ -798,7 +798,7 @@ int f2fs_recover_fsync_data(struct f2fs_sb_info *sbi, bool check_only)
INIT_LIST_HEAD(&dir_list);
/* prevent checkpoint */
mutex_lock(&sbi->cp_mutex);
down_write(&sbi->cp_global_sem);
/* step #1: find fsynced inode numbers */
err = find_fsync_dnodes(sbi, &inode_list, check_only);
@@ -834,7 +834,7 @@ int f2fs_recover_fsync_data(struct f2fs_sb_info *sbi, bool check_only)
} else {
clear_sbi_flag(sbi, SBI_POR_DOING);
}
mutex_unlock(&sbi->cp_mutex);
up_write(&sbi->cp_global_sem);
/* let's drop all the directory inodes for clean checkpoint */
destroy_fsync_dnodes(&dir_list, err);