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Subject[RFC v2 51/83] Rebuild: directory inode.
Date
From: Andiry Xu <jix024@cs.ucsd.edu>

When vfs issues a read inode command, or when the inode is newly allocated,
walk through the inode log to rebuild inode information and the radix tree.

Signed-off-by: Andiry Xu <jix024@cs.ucsd.edu>
---
fs/nova/inode.h | 15 +++
fs/nova/nova.h | 21 ++++
fs/nova/rebuild.c | 329 +++++++++++++++++++++++++++++++++++++++++++++++++++++-
3 files changed, 364 insertions(+), 1 deletion(-)

diff --git a/fs/nova/inode.h b/fs/nova/inode.h
index 62c8bdc..42690e6 100644
--- a/fs/nova/inode.h
+++ b/fs/nova/inode.h
@@ -97,6 +97,21 @@ struct nova_inode_info_header {
u8 i_blk_type;
};

+/* For rebuild purpose, temporarily store pi infomation */
+struct nova_inode_rebuild {
+ u64 i_size;
+ u32 i_flags; /* Inode flags */
+ u32 i_ctime; /* Inode modification time */
+ u32 i_mtime; /* Inode b-tree Modification time */
+ u32 i_atime; /* Access time */
+ u32 i_uid; /* Owner Uid */
+ u32 i_gid; /* Group Id */
+ u32 i_generation; /* File version (for NFS) */
+ u16 i_links_count; /* Links count */
+ u16 i_mode; /* File mode */
+ u64 trans_id;
+};
+
/*
* DRAM state for inodes
*/
diff --git a/fs/nova/nova.h b/fs/nova/nova.h
index 3a51dae..983c6b2 100644
--- a/fs/nova/nova.h
+++ b/fs/nova/nova.h
@@ -301,6 +301,24 @@ static inline u64 nova_get_epoch_id(struct super_block *sb)
}

#include "inode.h"
+
+static inline int nova_get_head_tail(struct super_block *sb,
+ struct nova_inode *pi, struct nova_inode_info_header *sih)
+{
+ struct nova_inode fake_pi;
+ int rc;
+
+ rc = memcpy_mcsafe(&fake_pi, pi, sizeof(struct nova_inode));
+ if (rc)
+ return rc;
+
+ sih->i_blk_type = fake_pi.i_blk_type;
+ sih->log_head = fake_pi.log_head;
+ sih->log_tail = fake_pi.log_tail;
+
+ return rc;
+}
+
#include "log.h"

struct nova_range_node_lowhigh {
@@ -467,6 +485,9 @@ int nova_remove_dentry(struct dentry *dentry, int dec_link,
struct nova_inode_update *update, u64 epoch_id);

/* rebuild.c */
+int nova_rebuild_dir_inode_tree(struct super_block *sb,
+ struct nova_inode *pi, u64 pi_addr,
+ struct nova_inode_info_header *sih);
int nova_rebuild_inode(struct super_block *sb, struct nova_inode_info *si,
u64 ino, u64 pi_addr, int rebuild_dir);

diff --git a/fs/nova/rebuild.c b/fs/nova/rebuild.c
index 0595851..9a1327d 100644
--- a/fs/nova/rebuild.c
+++ b/fs/nova/rebuild.c
@@ -18,6 +18,319 @@
#include "nova.h"
#include "inode.h"

+/* entry given to this function is a copy in dram */
+static void nova_apply_setattr_entry(struct super_block *sb,
+ struct nova_inode_rebuild *reb, struct nova_inode_info_header *sih,
+ struct nova_setattr_logentry *entry)
+{
+ unsigned int data_bits = blk_type_to_shift[sih->i_blk_type];
+ unsigned long first_blocknr, last_blocknr;
+ loff_t start, end;
+ int freed = 0;
+
+ reb->i_mode = entry->mode;
+ reb->i_uid = entry->uid;
+ reb->i_gid = entry->gid;
+ reb->i_atime = entry->atime;
+
+ if (S_ISREG(reb->i_mode)) {
+ start = entry->size;
+ end = reb->i_size;
+
+ first_blocknr = (start + (1UL << data_bits) - 1) >> data_bits;
+
+ if (end > 0)
+ last_blocknr = (end - 1) >> data_bits;
+ else
+ last_blocknr = 0;
+
+ freed = nova_delete_file_tree(sb, sih, first_blocknr,
+ last_blocknr, false, false, 0);
+ }
+}
+
+/* entry given to this function is a copy in dram */
+static void nova_apply_link_change_entry(struct super_block *sb,
+ struct nova_inode_rebuild *reb, struct nova_link_change_entry *entry)
+{
+ reb->i_links_count = entry->links;
+ reb->i_ctime = entry->ctime;
+ reb->i_flags = entry->flags;
+ reb->i_generation = entry->generation;
+
+ /* Do not flush now */
+}
+
+static void nova_update_inode_with_rebuild(struct super_block *sb,
+ struct nova_inode_rebuild *reb, struct nova_inode *pi)
+{
+ pi->i_size = cpu_to_le64(reb->i_size);
+ pi->i_flags = cpu_to_le32(reb->i_flags);
+ pi->i_uid = cpu_to_le32(reb->i_uid);
+ pi->i_gid = cpu_to_le32(reb->i_gid);
+ pi->i_atime = cpu_to_le32(reb->i_atime);
+ pi->i_ctime = cpu_to_le32(reb->i_ctime);
+ pi->i_mtime = cpu_to_le32(reb->i_mtime);
+ pi->i_generation = cpu_to_le32(reb->i_generation);
+ pi->i_links_count = cpu_to_le16(reb->i_links_count);
+ pi->i_mode = cpu_to_le16(reb->i_mode);
+}
+
+static int nova_init_inode_rebuild(struct super_block *sb,
+ struct nova_inode_rebuild *reb, struct nova_inode *pi)
+{
+ struct nova_inode fake_pi;
+ int rc;
+
+ rc = memcpy_mcsafe(&fake_pi, pi, sizeof(struct nova_inode));
+ if (rc)
+ return rc;
+
+ reb->i_size = le64_to_cpu(fake_pi.i_size);
+ reb->i_flags = le32_to_cpu(fake_pi.i_flags);
+ reb->i_uid = le32_to_cpu(fake_pi.i_uid);
+ reb->i_gid = le32_to_cpu(fake_pi.i_gid);
+ reb->i_atime = le32_to_cpu(fake_pi.i_atime);
+ reb->i_ctime = le32_to_cpu(fake_pi.i_ctime);
+ reb->i_mtime = le32_to_cpu(fake_pi.i_mtime);
+ reb->i_generation = le32_to_cpu(fake_pi.i_generation);
+ reb->i_links_count = le16_to_cpu(fake_pi.i_links_count);
+ reb->i_mode = le16_to_cpu(fake_pi.i_mode);
+ reb->trans_id = 0;
+
+ return rc;
+}
+
+static inline void nova_rebuild_file_time_and_size(struct super_block *sb,
+ struct nova_inode_rebuild *reb, u32 mtime, u32 ctime, u64 size)
+{
+ reb->i_mtime = cpu_to_le32(mtime);
+ reb->i_ctime = cpu_to_le32(ctime);
+ reb->i_size = cpu_to_le64(size);
+}
+
+static int nova_rebuild_inode_start(struct super_block *sb,
+ struct nova_inode *pi, struct nova_inode_info_header *sih,
+ struct nova_inode_rebuild *reb, u64 pi_addr)
+{
+ int ret;
+
+ ret = nova_get_head_tail(sb, pi, sih);
+ if (ret)
+ return ret;
+
+ ret = nova_init_inode_rebuild(sb, reb, pi);
+ if (ret)
+ return ret;
+
+ sih->pi_addr = pi_addr;
+
+ nova_dbg_verbose("Log head 0x%llx, tail 0x%llx\n",
+ sih->log_head, sih->log_tail);
+ sih->log_pages = 1;
+
+ return ret;
+}
+
+static int nova_rebuild_inode_finish(struct super_block *sb,
+ struct nova_inode *pi, struct nova_inode_info_header *sih,
+ struct nova_inode_rebuild *reb, u64 curr_p)
+{
+ u64 next;
+
+ sih->i_size = le64_to_cpu(reb->i_size);
+ sih->i_mode = le64_to_cpu(reb->i_mode);
+ sih->i_flags = le32_to_cpu(reb->i_flags);
+ sih->trans_id = reb->trans_id + 1;
+
+ nova_update_inode_with_rebuild(sb, reb, pi);
+ nova_persist_inode(pi);
+
+ /* Keep traversing until log ends */
+ curr_p &= PAGE_MASK;
+ while ((next = next_log_page(sb, curr_p)) > 0) {
+ sih->log_pages++;
+ curr_p = next;
+ }
+
+ return 0;
+}
+
+/******************* Directory rebuild *********************/
+
+static inline void nova_rebuild_dir_time_and_size(struct super_block *sb,
+ struct nova_inode_rebuild *reb, struct nova_dentry *entry)
+{
+ if (!entry || !reb)
+ return;
+
+ reb->i_ctime = entry->mtime;
+ reb->i_mtime = entry->mtime;
+ reb->i_links_count = entry->links_count;
+ //reb->i_size = entry->size;
+}
+
+static void nova_reassign_last_dentry(struct super_block *sb,
+ struct nova_inode_info_header *sih, u64 curr_p)
+{
+ struct nova_dentry *dentry, *old_dentry;
+
+ if (sih->last_dentry == 0) {
+ sih->last_dentry = curr_p;
+ } else {
+ old_dentry = (struct nova_dentry *)nova_get_block(sb,
+ sih->last_dentry);
+ dentry = (struct nova_dentry *)nova_get_block(sb, curr_p);
+ if (dentry->trans_id >= old_dentry->trans_id)
+ sih->last_dentry = curr_p;
+ }
+}
+
+static inline int nova_replay_add_dentry(struct super_block *sb,
+ struct nova_inode_info_header *sih, struct nova_dentry *entry)
+{
+ if (!entry->name_len)
+ return -EINVAL;
+
+ nova_dbg_verbose("%s: add %s\n", __func__, entry->name);
+ return nova_insert_dir_radix_tree(sb, sih,
+ entry->name, entry->name_len, entry);
+}
+
+/* entry given to this function is a copy in dram */
+static inline int nova_replay_remove_dentry(struct super_block *sb,
+ struct nova_inode_info_header *sih, struct nova_dentry *entry)
+{
+ nova_dbg_verbose("%s: remove %s\n", __func__, entry->name);
+ nova_remove_dir_radix_tree(sb, sih, entry->name,
+ entry->name_len, 1, NULL);
+ return 0;
+}
+
+static int nova_rebuild_handle_dentry(struct super_block *sb,
+ struct nova_inode_info_header *sih, struct nova_inode_rebuild *reb,
+ struct nova_dentry *entry, u64 curr_p)
+{
+ int ret = 0;
+
+ nova_dbgv("curr_p: 0x%llx, type %d, ino %llu, name %s, namelen %u, rec len %u\n",
+ curr_p,
+ entry->entry_type, le64_to_cpu(entry->ino),
+ entry->name, entry->name_len,
+ le16_to_cpu(entry->de_len));
+
+ nova_reassign_last_dentry(sb, sih, curr_p);
+
+ if (entry->invalid == 0) {
+ if (entry->ino > 0)
+ ret = nova_replay_add_dentry(sb, sih, entry);
+ else
+ ret = nova_replay_remove_dentry(sb, sih, entry);
+ }
+
+ if (ret) {
+ nova_err(sb, "%s ERROR %d\n", __func__, ret);
+ return ret;
+ }
+
+ if (entry->trans_id >= reb->trans_id) {
+ nova_rebuild_dir_time_and_size(sb, reb, entry);
+ reb->trans_id = entry->trans_id;
+ }
+
+ return ret;
+}
+
+int nova_rebuild_dir_inode_tree(struct super_block *sb,
+ struct nova_inode *pi, u64 pi_addr,
+ struct nova_inode_info_header *sih)
+{
+ struct nova_dentry *entry = NULL;
+ struct nova_setattr_logentry *attr_entry = NULL;
+ struct nova_link_change_entry *lc_entry = NULL;
+ struct nova_inode_rebuild rebuild, *reb;
+ u64 ino = pi->nova_ino;
+ unsigned short de_len;
+ timing_t rebuild_time;
+ void *addr, *entryc = NULL;
+ u64 curr_p;
+ u8 type;
+ int ret;
+
+ NOVA_START_TIMING(rebuild_dir_t, rebuild_time);
+ nova_dbgv("Rebuild dir %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) {
+ nova_err(sb, "Dir %llu log is NULL!\n", ino);
+ ret = -ENOSPC;
+ goto out;
+ }
+
+ 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, "Dir %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;
+ curr_p += sizeof(struct nova_setattr_logentry);
+ break;
+ case LINK_CHANGE:
+ lc_entry = (struct nova_link_change_entry *)entryc;
+ if (lc_entry->trans_id >= reb->trans_id) {
+ nova_apply_link_change_entry(sb, reb, lc_entry);
+ reb->trans_id = lc_entry->trans_id;
+ }
+ sih->last_link_change = curr_p;
+ curr_p += sizeof(struct nova_link_change_entry);
+ break;
+ case DIR_LOG:
+ entry = (struct nova_dentry *)addr;
+ ret = nova_rebuild_handle_dentry(sb, sih, reb,
+ entry, curr_p);
+ if (ret)
+ goto out;
+ de_len = le16_to_cpu(DENTRY(entryc)->de_len);
+ curr_p += de_len;
+ break;
+ default:
+ nova_dbg("%s: unknown type %d, 0x%llx\n",
+ __func__, type, curr_p);
+ NOVA_ASSERT(0);
+ break;
+ }
+ }
+
+ ret = nova_rebuild_inode_finish(sb, pi, sih, reb, curr_p);
+ sih->i_blocks = sih->log_pages;
+
+out:
+ NOVA_END_TIMING(rebuild_dir_t, rebuild_time);
+ return ret;
+}
+
/* initialize nova inode header and other DRAM data structures */
int nova_rebuild_inode(struct super_block *sb, struct nova_inode_info *si,
u64 ino, u64 pi_addr, int rebuild_dir)
@@ -42,7 +355,21 @@ int nova_rebuild_inode(struct super_block *sb, struct nova_inode_info *si,

sih->ino = ino;

- /* Traverse the log */
+ switch (__le16_to_cpu(pi->i_mode) & S_IFMT) {
+ case S_IFLNK:
+ /* Treat symlink files as normal files */
+ /* Fall through */
+ case S_IFREG:
+ break;
+ case S_IFDIR:
+ if (rebuild_dir)
+ nova_rebuild_dir_inode_tree(sb, pi, pi_addr, sih);
+ break;
+ default:
+ sih->pi_addr = pi_addr;
+ break;
+ }
+
return 0;
}

--
2.7.4
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