From bddc8541088f725c0a9a1748236d2063b1aebce0 Mon Sep 17 00:00:00 2001 From: Jaegeuk Kim Date: Wed, 29 May 2019 10:58:45 -0700 Subject: [PATCH] f2fs: add a rw_sem to cover quota flag changes Two paths to update quota and f2fs_lock_op: 1. - lock_op | - quota_update `- unlock_op 2. - quota_update - lock_op `- unlock_op But, we need to make a transaction on quota_update + lock_op in #2 case. So, this patch introduces: 1. lock_op 2. down_write 3. check __need_flush 4. up_write 5. if there is dirty quota entries, flush them 6. otherwise, good to go Signed-off-by: Jaegeuk Kim --- fs/f2fs/checkpoint.c | 41 +++++++++++++++++++---------------------- fs/f2fs/f2fs.h | 1 + fs/f2fs/super.c | 38 +++++++++++++++++++++++++++++++++----- 3 files changed, 53 insertions(+), 27 deletions(-) diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c index e435f8551b720..846ec6aab42f7 100644 --- a/fs/f2fs/checkpoint.c +++ b/fs/f2fs/checkpoint.c @@ -1129,17 +1129,24 @@ static void __prepare_cp_block(struct f2fs_sb_info *sbi) static bool __need_flush_quota(struct f2fs_sb_info *sbi) { + bool ret = false; + 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; + + down_write(&sbi->quota_sem); + 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)) { + clear_sbi_flag(sbi, SBI_QUOTA_NEED_FLUSH); + ret = true; + } else if (get_pages(sbi, F2FS_DIRTY_QDATA)) { + ret = true; + } + up_write(&sbi->quota_sem); + return ret; } /* @@ -1158,26 +1165,22 @@ static int block_operations(struct f2fs_sb_info *sbi) blk_start_plug(&plug); retry_flush_quotas: + f2fs_lock_all(sbi); if (__need_flush_quota(sbi)) { int locked; if (++cnt > DEFAULT_RETRY_QUOTA_FLUSH_COUNT) { set_sbi_flag(sbi, SBI_QUOTA_SKIP_FLUSH); - f2fs_lock_all(sbi); + set_sbi_flag(sbi, SBI_QUOTA_NEED_FLUSH); goto retry_flush_dents; } - clear_sbi_flag(sbi, SBI_QUOTA_NEED_FLUSH); + f2fs_unlock_all(sbi); /* only failed during mount/umount/freeze/quotactl */ locked = down_read_trylock(&sbi->sb->s_umount); f2fs_quota_sync(sbi->sb, -1); if (locked) up_read(&sbi->sb->s_umount); - } - - f2fs_lock_all(sbi); - if (__need_flush_quota(sbi)) { - f2fs_unlock_all(sbi); cond_resched(); goto retry_flush_quotas; } @@ -1199,12 +1202,6 @@ static int block_operations(struct f2fs_sb_info *sbi) */ down_write(&sbi->node_change); - if (__need_flush_quota(sbi)) { - up_write(&sbi->node_change); - f2fs_unlock_all(sbi); - goto retry_flush_quotas; - } - if (get_pages(sbi, F2FS_DIRTY_IMETA)) { up_write(&sbi->node_change); f2fs_unlock_all(sbi); diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index 0e14921b0219e..f39ccaea560d9 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -1352,6 +1352,7 @@ 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 6af4340414c15..c877b57f9ffa1 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -1937,6 +1937,18 @@ int f2fs_quota_sync(struct super_block *sb, int type) int cnt; int ret; + /* + * do_quotactl + * f2fs_quota_sync + * down_read(quota_sem) + * dquot_writeback_dquots() + * f2fs_dquot_commit + * block_operation + * down_read(quota_sem) + */ + f2fs_lock_op(sbi); + + down_read(&sbi->quota_sem); ret = dquot_writeback_dquots(sb, type); if (ret) goto out; @@ -1974,6 +1986,8 @@ int f2fs_quota_sync(struct super_block *sb, int type) out: if (ret) set_sbi_flag(F2FS_SB(sb), SBI_QUOTA_NEED_REPAIR); + up_read(&sbi->quota_sem); + f2fs_unlock_op(sbi); return ret; } @@ -2092,32 +2106,40 @@ 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; } @@ -2127,22 +2149,27 @@ 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; } @@ -3231,6 +3258,7 @@ 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);