[RFC v2 52/83] Rebuild: file inode.

Andiry Xu
2018-03-10T18:31:44Z

Rebuild file inode metadata and radix tree on read_inode.

Signed-off-by: Andiry Xu <jix024@cs.ucsd.edu>
---
fs/nova/log.h | 4 ++
fs/nova/rebuild.c | 124 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 128 insertions(+)

diff --git a/fs/nova/log.h b/fs/nova/log.h
index 87ce5f9..bdb85eb 100644
--- a/fs/nova/log.h
+++ b/fs/nova/log.h
@@ -385,6 +385,10 @@ int nova_inplace_update_write_entry(struct super_block *sb,
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);
+int nova_assign_write_entry(struct super_block *sb,
+ struct nova_inode_info_header *sih,
+ struct nova_file_write_entry *entry,
+ bool free);
int nova_invalidate_dentries(struct super_block *sb,
struct nova_inode_update *update);
int nova_inplace_update_dentry(struct super_block *sb,
diff --git a/fs/nova/rebuild.c b/fs/nova/rebuild.c
index 9a1327d..07cf6e3 100644
--- a/fs/nova/rebuild.c
+++ b/fs/nova/rebuild.c
@@ -156,6 +156,126 @@ static int nova_rebuild_inode_finish(struct super_block *sb,
return 0;
}

+static void nova_rebuild_handle_write_entry(struct super_block *sb,
+ struct nova_inode_info_header *sih, struct nova_inode_rebuild *reb,
+ struct nova_file_write_entry *entry)
+{
+ if (entry->num_pages != entry->invalid_pages) {
+ /*
+ * The overlaped blocks are already freed.
+ * Don't double free them, just re-assign the pointers.
+ */
+ nova_assign_write_entry(sb, sih, entry, false);
+ }
+
+ if (entry->trans_id >= sih->trans_id) {
+ nova_rebuild_file_time_and_size(sb, reb,
+ entry->mtime, entry->mtime,
+ entry->size);
+ reb->trans_id = entry->trans_id;
+ }
+
+ /* Update sih->i_size for setattr apply operations */
+ sih->i_size = le64_to_cpu(reb->i_size);
+}
+
+static int nova_rebuild_file_inode_tree(struct super_block *sb,
+ struct nova_inode *pi, u64 pi_addr,
+ struct nova_inode_info_header *sih)
+{
+ struct nova_file_write_entry *entry = NULL;
+ struct nova_setattr_logentry *attr_entry = NULL;
+ struct nova_link_change_entry *link_change_entry = NULL;
+ struct nova_inode_rebuild rebuild, *reb;
+ unsigned int data_bits = blk_type_to_shift[sih->i_blk_type];
+ u64 ino = pi->nova_ino;
+ timing_t rebuild_time;
+ void *addr, *entryc = NULL;
+ u64 curr_p;
+ u8 type;
+ int ret;
+
+ NOVA_START_TIMING(rebuild_file_t, rebuild_time);
+ nova_dbg_verbose("Rebuild file inode %llu tree\n", ino);
+
+ reb = &rebuild;
+ ret = nova_rebuild_inode_start(sb, pi, sih, reb, pi_addr);
+ if (ret)
+ goto out;
+
+ curr_p = sih->log_head;
+ if (curr_p == 0 && sih->log_tail == 0)
+ goto out;
+
+// nova_print_nova_log(sb, sih);
+
+ while (curr_p != sih->log_tail) {
+ if (goto_next_page(sb, curr_p)) {
+ sih->log_pages++;
+ curr_p = next_log_page(sb, curr_p);
+ }
+
+ if (curr_p == 0) {
+ nova_err(sb, "File inode %llu log is NULL!\n", ino);
+ ret = -EIO;
+ goto out;
+ }
+
+ addr = (void *)nova_get_block(sb, curr_p);
+
+ entryc = addr;
+
+ type = nova_get_entry_type(entryc);
+
+ switch (type) {
+ case SET_ATTR:
+ attr_entry = (struct nova_setattr_logentry *)entryc;
+ nova_apply_setattr_entry(sb, reb, sih, attr_entry);
+ sih->last_setattr = curr_p;
+ if (attr_entry->trans_id >= reb->trans_id) {
+ nova_rebuild_file_time_and_size(sb, reb,
+ attr_entry->mtime,
+ attr_entry->ctime,
+ attr_entry->size);
+ reb->trans_id = attr_entry->trans_id;
+ }
+
+ /* Update sih->i_size for setattr operation */
+ sih->i_size = le64_to_cpu(reb->i_size);
+ curr_p += sizeof(struct nova_setattr_logentry);
+ break;
+ case LINK_CHANGE:
+ link_change_entry =
+ (struct nova_link_change_entry *)entryc;
+ nova_apply_link_change_entry(sb, reb,
+ link_change_entry);
+ sih->last_link_change = curr_p;
+ curr_p += sizeof(struct nova_link_change_entry);
+ break;
+ case FILE_WRITE:
+ entry = (struct nova_file_write_entry *)addr;
+ nova_rebuild_handle_write_entry(sb, sih, reb,
+ entryc);
+ curr_p += sizeof(struct nova_file_write_entry);
+ break;
+ default:
+ nova_err(sb, "unknown type %d, 0x%llx\n", type, curr_p);
+ NOVA_ASSERT(0);
+ curr_p += sizeof(struct nova_file_write_entry);
+ break;
+ }
+
+ }
+
+ ret = nova_rebuild_inode_finish(sb, pi, sih, reb, curr_p);
+ sih->i_blocks = sih->log_pages + (sih->i_size >> data_bits);
+
+out:
+// nova_print_inode_log_page(sb, inode);
+ NOVA_END_TIMING(rebuild_file_t, rebuild_time);
+ return ret;
+}
+
/******************* Directory rebuild *********************/

static inline void nova_rebuild_dir_time_and_size(struct super_block *sb,
@@ -360,12 +480,16 @@ int nova_rebuild_inode(struct super_block *sb, struct nova_inode_info *si,
/* Treat symlink files as normal files */
/* Fall through */
case S_IFREG:
+ nova_rebuild_file_inode_tree(sb, pi, pi_addr, sih);
break;
case S_IFDIR:
if (rebuild_dir)
nova_rebuild_dir_inode_tree(sb, pi, pi_addr, sih);
break;
default:
+ /* In case of special inode, walk the log */
+ if (pi->log_head)
+ nova_rebuild_file_inode_tree(sb, pi, pi_addr, sih);
sih->pi_addr = pi_addr;
break;
}
--
2.7.4