From aaec2b1d18792a5f27b69ff37f34f43f89f5aa3b Mon Sep 17 00:00:00 2001 From: Chao Yu Date: Tue, 20 Sep 2016 11:04:18 +0800 Subject: [PATCH] f2fs: introduce cp_lock to protect updating of ckpt_flags This patch introduces spinlock to protect updating process of ckpt_flags field in struct f2fs_checkpoint, it avoids incorrectly updating in race condition. Signed-off-by: Chao Yu [Jaegeuk Kim: add __is_set_ckpt_flags likewise __set_ckpt_flags] Signed-off-by: Jaegeuk Kim --- fs/f2fs/checkpoint.c | 31 ++++++++++++++++++------------- fs/f2fs/f2fs.h | 41 +++++++++++++++++++++++++++++++++-------- fs/f2fs/node.h | 4 ++-- fs/f2fs/recovery.c | 2 +- fs/f2fs/segment.c | 4 ++-- fs/f2fs/super.c | 5 +++-- 6 files changed, 59 insertions(+), 28 deletions(-) diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c index 9c6439b0e8d2..591db95222d1 100644 --- a/fs/f2fs/checkpoint.c +++ b/fs/f2fs/checkpoint.c @@ -28,7 +28,7 @@ struct kmem_cache *inode_entry_slab; void f2fs_stop_checkpoint(struct f2fs_sb_info *sbi, bool end_io) { - set_ckpt_flags(sbi->ckpt, CP_ERROR_FLAG); + set_ckpt_flags(sbi, CP_ERROR_FLAG); sbi->sb->s_flags |= MS_RDONLY; if (!end_io) f2fs_flush_merged_bios(sbi); @@ -571,7 +571,7 @@ int recover_orphan_inodes(struct f2fs_sb_info *sbi) block_t start_blk, orphan_blocks, i, j; int err; - if (!is_set_ckpt_flags(F2FS_CKPT(sbi), CP_ORPHAN_PRESENT_FLAG)) + if (!is_set_ckpt_flags(sbi, CP_ORPHAN_PRESENT_FLAG)) return 0; start_blk = __start_cp_addr(sbi) + 1 + __cp_payload(sbi); @@ -595,7 +595,7 @@ int recover_orphan_inodes(struct f2fs_sb_info *sbi) f2fs_put_page(page, 1); } /* clear Orphan Flag */ - clear_ckpt_flags(F2FS_CKPT(sbi), CP_ORPHAN_PRESENT_FLAG); + clear_ckpt_flags(sbi, CP_ORPHAN_PRESENT_FLAG); return 0; } @@ -1043,10 +1043,12 @@ static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc) /* 2 cp + n data seg summary + orphan inode blocks */ data_sum_blocks = npages_for_summary_flush(sbi, false); + spin_lock(&sbi->cp_lock); if (data_sum_blocks < NR_CURSEG_DATA_TYPE) - set_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG); + __set_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG); else - clear_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG); + __clear_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG); + spin_unlock(&sbi->cp_lock); orphan_blocks = GET_ORPHAN_BLOCKS(orphan_num); ckpt->cp_pack_start_sum = cpu_to_le32(1 + cp_payload_blks + @@ -1061,26 +1063,29 @@ static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc) cp_payload_blks + data_sum_blocks + orphan_blocks); + spin_lock(&sbi->cp_lock); if (cpc->reason == CP_UMOUNT) - set_ckpt_flags(ckpt, CP_UMOUNT_FLAG); + __set_ckpt_flags(ckpt, CP_UMOUNT_FLAG); else - clear_ckpt_flags(ckpt, CP_UMOUNT_FLAG); + __clear_ckpt_flags(ckpt, CP_UMOUNT_FLAG); if (cpc->reason == CP_FASTBOOT) - set_ckpt_flags(ckpt, CP_FASTBOOT_FLAG); + __set_ckpt_flags(ckpt, CP_FASTBOOT_FLAG); else - clear_ckpt_flags(ckpt, CP_FASTBOOT_FLAG); + __clear_ckpt_flags(ckpt, CP_FASTBOOT_FLAG); if (orphan_num) - set_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG); + __set_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG); else - clear_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG); + __clear_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG); if (is_sbi_flag_set(sbi, SBI_NEED_FSCK)) - set_ckpt_flags(ckpt, CP_FSCK_FLAG); + __set_ckpt_flags(ckpt, CP_FSCK_FLAG); /* set this flag to activate crc|cp_ver for recovery */ - set_ckpt_flags(ckpt, CP_CRC_RECOVERY_FLAG); + __set_ckpt_flags(ckpt, CP_CRC_RECOVERY_FLAG); + + spin_unlock(&sbi->cp_lock); /* update SIT/NAT bitmap */ get_sit_bitmap(sbi, __bitmap_ptr(sbi, SIT_BITMAP)); diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index 04e96181e928..2fb8c353ab4a 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -797,6 +797,7 @@ struct f2fs_sb_info { /* for checkpoint */ struct f2fs_checkpoint *ckpt; /* raw checkpoint pointer */ + spinlock_t cp_lock; /* for flag in ckpt */ struct inode *meta_inode; /* cache meta blocks */ struct mutex cp_mutex; /* checkpoint procedure lock */ struct rw_semaphore cp_rwsem; /* blocking FS operations */ @@ -1064,26 +1065,50 @@ static inline unsigned long long cur_cp_version(struct f2fs_checkpoint *cp) return le64_to_cpu(cp->checkpoint_ver); } -static inline bool is_set_ckpt_flags(struct f2fs_checkpoint *cp, unsigned int f) +static inline bool __is_set_ckpt_flags(struct f2fs_checkpoint *cp, unsigned int f) { unsigned int ckpt_flags = le32_to_cpu(cp->ckpt_flags); + return ckpt_flags & f; } -static inline void set_ckpt_flags(struct f2fs_checkpoint *cp, unsigned int f) +static inline bool is_set_ckpt_flags(struct f2fs_sb_info *sbi, unsigned int f) { - unsigned int ckpt_flags = le32_to_cpu(cp->ckpt_flags); + return __is_set_ckpt_flags(F2FS_CKPT(sbi), f); +} + +static inline void __set_ckpt_flags(struct f2fs_checkpoint *cp, unsigned int f) +{ + unsigned int ckpt_flags; + + ckpt_flags = le32_to_cpu(cp->ckpt_flags); ckpt_flags |= f; cp->ckpt_flags = cpu_to_le32(ckpt_flags); } -static inline void clear_ckpt_flags(struct f2fs_checkpoint *cp, unsigned int f) +static inline void set_ckpt_flags(struct f2fs_sb_info *sbi, unsigned int f) { - unsigned int ckpt_flags = le32_to_cpu(cp->ckpt_flags); + spin_lock(&sbi->cp_lock); + __set_ckpt_flags(F2FS_CKPT(sbi), f); + spin_unlock(&sbi->cp_lock); +} + +static inline void __clear_ckpt_flags(struct f2fs_checkpoint *cp, unsigned int f) +{ + unsigned int ckpt_flags; + + ckpt_flags = le32_to_cpu(cp->ckpt_flags); ckpt_flags &= (~f); cp->ckpt_flags = cpu_to_le32(ckpt_flags); } +static inline void clear_ckpt_flags(struct f2fs_sb_info *sbi, unsigned int f) +{ + spin_lock(&sbi->cp_lock); + __clear_ckpt_flags(F2FS_CKPT(sbi), f); + spin_unlock(&sbi->cp_lock); +} + static inline bool f2fs_discard_en(struct f2fs_sb_info *sbi) { struct request_queue *q = bdev_get_queue(sbi->sb->s_bdev); @@ -1129,8 +1154,8 @@ static inline bool __remain_node_summaries(int reason) static inline bool __exist_node_summaries(struct f2fs_sb_info *sbi) { - return (is_set_ckpt_flags(F2FS_CKPT(sbi), CP_UMOUNT_FLAG) || - is_set_ckpt_flags(F2FS_CKPT(sbi), CP_FASTBOOT_FLAG)); + return (is_set_ckpt_flags(sbi, CP_UMOUNT_FLAG) || + is_set_ckpt_flags(sbi, CP_FASTBOOT_FLAG)); } /* @@ -1832,7 +1857,7 @@ static inline int f2fs_readonly(struct super_block *sb) static inline bool f2fs_cp_error(struct f2fs_sb_info *sbi) { - return is_set_ckpt_flags(sbi->ckpt, CP_ERROR_FLAG); + return is_set_ckpt_flags(sbi, CP_ERROR_FLAG); } static inline bool is_dot_dotdot(const struct qstr *str) diff --git a/fs/f2fs/node.h b/fs/f2fs/node.h index e8ca64a70de0..868bec65e51c 100644 --- a/fs/f2fs/node.h +++ b/fs/f2fs/node.h @@ -293,7 +293,7 @@ static inline void fill_node_footer_blkaddr(struct page *page, block_t blkaddr) size_t crc_offset = le32_to_cpu(ckpt->checksum_offset); __u64 cp_ver = le64_to_cpu(ckpt->checkpoint_ver); - if (is_set_ckpt_flags(ckpt, CP_CRC_RECOVERY_FLAG)) { + if (__is_set_ckpt_flags(ckpt, CP_CRC_RECOVERY_FLAG)) { __u64 crc = le32_to_cpu(*((__le32 *) ((unsigned char *)ckpt + crc_offset))); cp_ver |= (crc << 32); @@ -308,7 +308,7 @@ static inline bool is_recoverable_dnode(struct page *page) size_t crc_offset = le32_to_cpu(ckpt->checksum_offset); __u64 cp_ver = cur_cp_version(ckpt); - if (is_set_ckpt_flags(ckpt, CP_CRC_RECOVERY_FLAG)) { + if (__is_set_ckpt_flags(ckpt, CP_CRC_RECOVERY_FLAG)) { __u64 crc = le32_to_cpu(*((__le32 *) ((unsigned char *)ckpt + crc_offset))); cp_ver |= (crc << 32); diff --git a/fs/f2fs/recovery.c b/fs/f2fs/recovery.c index 509273a65157..2fc84a991325 100644 --- a/fs/f2fs/recovery.c +++ b/fs/f2fs/recovery.c @@ -627,7 +627,7 @@ out: clear_sbi_flag(sbi, SBI_POR_DOING); if (err) - set_ckpt_flags(sbi->ckpt, CP_ERROR_FLAG); + set_ckpt_flags(sbi, CP_ERROR_FLAG); mutex_unlock(&sbi->cp_mutex); /* let's drop all the directory inodes for clean checkpoint */ diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c index 2d23d7b17d6c..e78501ca761e 100644 --- a/fs/f2fs/segment.c +++ b/fs/f2fs/segment.c @@ -1801,7 +1801,7 @@ static int restore_curseg_summaries(struct f2fs_sb_info *sbi) int type = CURSEG_HOT_DATA; int err; - if (is_set_ckpt_flags(F2FS_CKPT(sbi), CP_COMPACT_SUM_FLAG)) { + if (is_set_ckpt_flags(sbi, CP_COMPACT_SUM_FLAG)) { int npages = npages_for_summary_flush(sbi, true); if (npages >= 2) @@ -1898,7 +1898,7 @@ static void write_normal_summaries(struct f2fs_sb_info *sbi, void write_data_summaries(struct f2fs_sb_info *sbi, block_t start_blk) { - if (is_set_ckpt_flags(F2FS_CKPT(sbi), CP_COMPACT_SUM_FLAG)) + if (is_set_ckpt_flags(sbi, CP_COMPACT_SUM_FLAG)) write_compacted_summaries(sbi, start_blk); else write_normal_summaries(sbi, start_blk, CURSEG_HOT_DATA); diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index 9649b79eefe8..95986a9aa615 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -736,7 +736,7 @@ static void f2fs_put_super(struct super_block *sb) * clean checkpoint again. */ if (is_sbi_flag_set(sbi, SBI_IS_DIRTY) || - !is_set_ckpt_flags(F2FS_CKPT(sbi), CP_UMOUNT_FLAG)) { + !is_set_ckpt_flags(sbi, CP_UMOUNT_FLAG)) { struct cp_control cpc = { .reason = CP_UMOUNT, }; @@ -1478,6 +1478,7 @@ static void init_sb_info(struct f2fs_sb_info *sbi) mutex_init(&sbi->umount_mutex); mutex_init(&sbi->wio_mutex[NODE]); mutex_init(&sbi->wio_mutex[DATA]); + spin_lock_init(&sbi->cp_lock); #ifdef CONFIG_F2FS_FS_ENCRYPTION memcpy(sbi->key_prefix, F2FS_KEY_DESC_PREFIX, @@ -1819,7 +1820,7 @@ try_onemore: * previous checkpoint was not done by clean system shutdown. */ if (bdev_read_only(sb->s_bdev) && - !is_set_ckpt_flags(sbi->ckpt, CP_UMOUNT_FLAG)) { + !is_set_ckpt_flags(sbi, CP_UMOUNT_FLAG)) { err = -EROFS; goto free_kobj; } -- 2.20.1