From: Andiry Xu <jix024@xxxxxxxxxxx> NOVA appends link change entries to atomically update link count and ctime. This occurs in link, unlink and rmdir. Signed-off-by: Andiry Xu <jix024@xxxxxxxxxxx> --- fs/nova/log.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++ fs/nova/log.h | 3 +++ 2 files changed, 55 insertions(+) diff --git a/fs/nova/log.c b/fs/nova/log.c index f85b63e..4638ccf 100644 --- a/fs/nova/log.c +++ b/fs/nova/log.c @@ -51,6 +51,25 @@ static void nova_update_setattr_entry(struct inode *inode, nova_persist_entry(entry); } +static void nova_update_link_change_entry(struct inode *inode, + struct nova_link_change_entry *entry, + struct nova_log_entry_info *entry_info) +{ + struct nova_inode_info *si = NOVA_I(inode); + struct nova_inode_info_header *sih = &si->header; + + entry->entry_type = LINK_CHANGE; + entry->epoch_id = cpu_to_le64(entry_info->epoch_id); + entry->trans_id = cpu_to_le64(entry_info->trans_id); + entry->invalid = 0; + entry->links = cpu_to_le16(inode->i_nlink); + entry->ctime = cpu_to_le32(inode->i_ctime.tv_sec); + entry->flags = cpu_to_le32(sih->i_flags); + entry->generation = cpu_to_le32(inode->i_generation); + + nova_persist_entry(entry); +} + static int nova_update_write_entry(struct super_block *sb, struct nova_file_write_entry *entry, struct nova_log_entry_info *entry_info) @@ -150,6 +169,7 @@ static int nova_update_log_entry(struct super_block *sb, struct inode *inode, nova_update_setattr_entry(inode, entry, entry_info); break; case LINK_CHANGE: + nova_update_link_change_entry(inode, entry, entry_info); break; default: break; @@ -230,6 +250,38 @@ static int nova_append_setattr_entry(struct super_block *sb, return ret; } +/* Returns new tail after append */ +int nova_append_link_change_entry(struct super_block *sb, + struct nova_inode *pi, struct inode *inode, + struct nova_inode_update *update, u64 *old_linkc, u64 epoch_id) +{ + struct nova_inode_info *si = NOVA_I(inode); + struct nova_inode_info_header *sih = &si->header; + struct nova_log_entry_info entry_info; + int ret = 0; + timing_t append_time; + + NOVA_START_TIMING(append_link_change_t, append_time); + + entry_info.type = LINK_CHANGE; + entry_info.update = update; + entry_info.epoch_id = epoch_id; + entry_info.trans_id = sih->trans_id; + + ret = nova_append_log_entry(sb, pi, inode, sih, &entry_info); + if (ret) { + nova_err(sb, "%s failed\n", __func__); + goto out; + } + + *old_linkc = sih->last_link_change; + sih->last_link_change = entry_info.curr_p; + sih->trans_id++; +out: + NOVA_END_TIMING(append_link_change_t, append_time); + return ret; +} + /* * Append a nova_file_write_entry to the current nova_inode_log_page. * blocknr and start_blk are pgoff. diff --git a/fs/nova/log.h b/fs/nova/log.h index db7a72e..f36f4a3 100644 --- a/fs/nova/log.h +++ b/fs/nova/log.h @@ -364,6 +364,9 @@ static inline int is_dir_init_entry(struct super_block *sb, } +int nova_append_link_change_entry(struct super_block *sb, + struct nova_inode *pi, struct inode *inode, + struct nova_inode_update *update, u64 *old_linkc, u64 epoch_id); int nova_append_file_write_entry(struct super_block *sb, struct nova_inode *pi, struct inode *inode, struct nova_file_write_item *item, struct nova_inode_update *update); -- 2.7.4