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 <yuchao0@huawei.com> [Jaegeuk Kim: add __is_set_ckpt_flags likewise __set_ckpt_flags] Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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fadb2fb8af
Коммит
aaec2b1d18
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@ -28,7 +28,7 @@ struct kmem_cache *inode_entry_slab;
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void f2fs_stop_checkpoint(struct f2fs_sb_info *sbi, bool end_io)
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{
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set_ckpt_flags(sbi->ckpt, CP_ERROR_FLAG);
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set_ckpt_flags(sbi, CP_ERROR_FLAG);
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sbi->sb->s_flags |= MS_RDONLY;
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if (!end_io)
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f2fs_flush_merged_bios(sbi);
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@ -571,7 +571,7 @@ int recover_orphan_inodes(struct f2fs_sb_info *sbi)
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block_t start_blk, orphan_blocks, i, j;
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int err;
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if (!is_set_ckpt_flags(F2FS_CKPT(sbi), CP_ORPHAN_PRESENT_FLAG))
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if (!is_set_ckpt_flags(sbi, CP_ORPHAN_PRESENT_FLAG))
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return 0;
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start_blk = __start_cp_addr(sbi) + 1 + __cp_payload(sbi);
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@ -595,7 +595,7 @@ int recover_orphan_inodes(struct f2fs_sb_info *sbi)
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f2fs_put_page(page, 1);
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}
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/* clear Orphan Flag */
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clear_ckpt_flags(F2FS_CKPT(sbi), CP_ORPHAN_PRESENT_FLAG);
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clear_ckpt_flags(sbi, CP_ORPHAN_PRESENT_FLAG);
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return 0;
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}
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@ -1043,10 +1043,12 @@ static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
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/* 2 cp + n data seg summary + orphan inode blocks */
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data_sum_blocks = npages_for_summary_flush(sbi, false);
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spin_lock(&sbi->cp_lock);
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if (data_sum_blocks < NR_CURSEG_DATA_TYPE)
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set_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG);
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__set_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG);
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else
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clear_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG);
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__clear_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG);
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spin_unlock(&sbi->cp_lock);
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orphan_blocks = GET_ORPHAN_BLOCKS(orphan_num);
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ckpt->cp_pack_start_sum = cpu_to_le32(1 + cp_payload_blks +
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@ -1061,26 +1063,29 @@ static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
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cp_payload_blks + data_sum_blocks +
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orphan_blocks);
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spin_lock(&sbi->cp_lock);
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if (cpc->reason == CP_UMOUNT)
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set_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
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__set_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
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else
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clear_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
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__clear_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
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if (cpc->reason == CP_FASTBOOT)
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set_ckpt_flags(ckpt, CP_FASTBOOT_FLAG);
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__set_ckpt_flags(ckpt, CP_FASTBOOT_FLAG);
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else
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clear_ckpt_flags(ckpt, CP_FASTBOOT_FLAG);
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__clear_ckpt_flags(ckpt, CP_FASTBOOT_FLAG);
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if (orphan_num)
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set_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG);
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__set_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG);
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else
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clear_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG);
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__clear_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG);
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if (is_sbi_flag_set(sbi, SBI_NEED_FSCK))
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set_ckpt_flags(ckpt, CP_FSCK_FLAG);
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__set_ckpt_flags(ckpt, CP_FSCK_FLAG);
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/* set this flag to activate crc|cp_ver for recovery */
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set_ckpt_flags(ckpt, CP_CRC_RECOVERY_FLAG);
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__set_ckpt_flags(ckpt, CP_CRC_RECOVERY_FLAG);
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spin_unlock(&sbi->cp_lock);
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/* update SIT/NAT bitmap */
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get_sit_bitmap(sbi, __bitmap_ptr(sbi, SIT_BITMAP));
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@ -797,6 +797,7 @@ struct f2fs_sb_info {
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/* for checkpoint */
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struct f2fs_checkpoint *ckpt; /* raw checkpoint pointer */
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spinlock_t cp_lock; /* for flag in ckpt */
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struct inode *meta_inode; /* cache meta blocks */
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struct mutex cp_mutex; /* checkpoint procedure lock */
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struct rw_semaphore cp_rwsem; /* blocking FS operations */
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@ -1064,26 +1065,50 @@ static inline unsigned long long cur_cp_version(struct f2fs_checkpoint *cp)
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return le64_to_cpu(cp->checkpoint_ver);
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}
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static inline bool is_set_ckpt_flags(struct f2fs_checkpoint *cp, unsigned int f)
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static inline bool __is_set_ckpt_flags(struct f2fs_checkpoint *cp, unsigned int f)
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{
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unsigned int ckpt_flags = le32_to_cpu(cp->ckpt_flags);
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return ckpt_flags & f;
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}
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static inline void set_ckpt_flags(struct f2fs_checkpoint *cp, unsigned int f)
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static inline bool is_set_ckpt_flags(struct f2fs_sb_info *sbi, unsigned int f)
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{
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unsigned int ckpt_flags = le32_to_cpu(cp->ckpt_flags);
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return __is_set_ckpt_flags(F2FS_CKPT(sbi), f);
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}
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static inline void __set_ckpt_flags(struct f2fs_checkpoint *cp, unsigned int f)
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{
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unsigned int ckpt_flags;
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ckpt_flags = le32_to_cpu(cp->ckpt_flags);
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ckpt_flags |= f;
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cp->ckpt_flags = cpu_to_le32(ckpt_flags);
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}
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static inline void clear_ckpt_flags(struct f2fs_checkpoint *cp, unsigned int f)
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static inline void set_ckpt_flags(struct f2fs_sb_info *sbi, unsigned int f)
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{
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unsigned int ckpt_flags = le32_to_cpu(cp->ckpt_flags);
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spin_lock(&sbi->cp_lock);
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__set_ckpt_flags(F2FS_CKPT(sbi), f);
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spin_unlock(&sbi->cp_lock);
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}
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static inline void __clear_ckpt_flags(struct f2fs_checkpoint *cp, unsigned int f)
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{
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unsigned int ckpt_flags;
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ckpt_flags = le32_to_cpu(cp->ckpt_flags);
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ckpt_flags &= (~f);
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cp->ckpt_flags = cpu_to_le32(ckpt_flags);
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}
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static inline void clear_ckpt_flags(struct f2fs_sb_info *sbi, unsigned int f)
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{
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spin_lock(&sbi->cp_lock);
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__clear_ckpt_flags(F2FS_CKPT(sbi), f);
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spin_unlock(&sbi->cp_lock);
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}
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static inline bool f2fs_discard_en(struct f2fs_sb_info *sbi)
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{
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struct request_queue *q = bdev_get_queue(sbi->sb->s_bdev);
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@ -1129,8 +1154,8 @@ static inline bool __remain_node_summaries(int reason)
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static inline bool __exist_node_summaries(struct f2fs_sb_info *sbi)
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{
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return (is_set_ckpt_flags(F2FS_CKPT(sbi), CP_UMOUNT_FLAG) ||
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is_set_ckpt_flags(F2FS_CKPT(sbi), CP_FASTBOOT_FLAG));
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return (is_set_ckpt_flags(sbi, CP_UMOUNT_FLAG) ||
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is_set_ckpt_flags(sbi, CP_FASTBOOT_FLAG));
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}
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/*
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@ -1832,7 +1857,7 @@ static inline int f2fs_readonly(struct super_block *sb)
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static inline bool f2fs_cp_error(struct f2fs_sb_info *sbi)
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{
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return is_set_ckpt_flags(sbi->ckpt, CP_ERROR_FLAG);
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return is_set_ckpt_flags(sbi, CP_ERROR_FLAG);
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}
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static inline bool is_dot_dotdot(const struct qstr *str)
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@ -293,7 +293,7 @@ static inline void fill_node_footer_blkaddr(struct page *page, block_t blkaddr)
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size_t crc_offset = le32_to_cpu(ckpt->checksum_offset);
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__u64 cp_ver = le64_to_cpu(ckpt->checkpoint_ver);
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if (is_set_ckpt_flags(ckpt, CP_CRC_RECOVERY_FLAG)) {
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if (__is_set_ckpt_flags(ckpt, CP_CRC_RECOVERY_FLAG)) {
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__u64 crc = le32_to_cpu(*((__le32 *)
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((unsigned char *)ckpt + crc_offset)));
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cp_ver |= (crc << 32);
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@ -308,7 +308,7 @@ static inline bool is_recoverable_dnode(struct page *page)
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size_t crc_offset = le32_to_cpu(ckpt->checksum_offset);
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__u64 cp_ver = cur_cp_version(ckpt);
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if (is_set_ckpt_flags(ckpt, CP_CRC_RECOVERY_FLAG)) {
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if (__is_set_ckpt_flags(ckpt, CP_CRC_RECOVERY_FLAG)) {
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__u64 crc = le32_to_cpu(*((__le32 *)
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((unsigned char *)ckpt + crc_offset)));
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cp_ver |= (crc << 32);
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@ -627,7 +627,7 @@ out:
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clear_sbi_flag(sbi, SBI_POR_DOING);
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if (err)
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set_ckpt_flags(sbi->ckpt, CP_ERROR_FLAG);
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set_ckpt_flags(sbi, CP_ERROR_FLAG);
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mutex_unlock(&sbi->cp_mutex);
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/* let's drop all the directory inodes for clean checkpoint */
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@ -1801,7 +1801,7 @@ static int restore_curseg_summaries(struct f2fs_sb_info *sbi)
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int type = CURSEG_HOT_DATA;
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int err;
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if (is_set_ckpt_flags(F2FS_CKPT(sbi), CP_COMPACT_SUM_FLAG)) {
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if (is_set_ckpt_flags(sbi, CP_COMPACT_SUM_FLAG)) {
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int npages = npages_for_summary_flush(sbi, true);
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if (npages >= 2)
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@ -1898,7 +1898,7 @@ static void write_normal_summaries(struct f2fs_sb_info *sbi,
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void write_data_summaries(struct f2fs_sb_info *sbi, block_t start_blk)
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{
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if (is_set_ckpt_flags(F2FS_CKPT(sbi), CP_COMPACT_SUM_FLAG))
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if (is_set_ckpt_flags(sbi, CP_COMPACT_SUM_FLAG))
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write_compacted_summaries(sbi, start_blk);
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else
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write_normal_summaries(sbi, start_blk, CURSEG_HOT_DATA);
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@ -736,7 +736,7 @@ static void f2fs_put_super(struct super_block *sb)
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* clean checkpoint again.
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*/
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if (is_sbi_flag_set(sbi, SBI_IS_DIRTY) ||
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!is_set_ckpt_flags(F2FS_CKPT(sbi), CP_UMOUNT_FLAG)) {
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!is_set_ckpt_flags(sbi, CP_UMOUNT_FLAG)) {
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struct cp_control cpc = {
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.reason = CP_UMOUNT,
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};
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@ -1478,6 +1478,7 @@ static void init_sb_info(struct f2fs_sb_info *sbi)
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mutex_init(&sbi->umount_mutex);
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mutex_init(&sbi->wio_mutex[NODE]);
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mutex_init(&sbi->wio_mutex[DATA]);
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spin_lock_init(&sbi->cp_lock);
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#ifdef CONFIG_F2FS_FS_ENCRYPTION
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memcpy(sbi->key_prefix, F2FS_KEY_DESC_PREFIX,
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@ -1819,7 +1820,7 @@ try_onemore:
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* previous checkpoint was not done by clean system shutdown.
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*/
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if (bdev_read_only(sb->s_bdev) &&
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!is_set_ckpt_flags(sbi->ckpt, CP_UMOUNT_FLAG)) {
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!is_set_ckpt_flags(sbi, CP_UMOUNT_FLAG)) {
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err = -EROFS;
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goto free_kobj;
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}
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