[RFC v2 30/83] New NOVA inode allocation.

Andiry Xu
2018-03-10T18:20:59Z

Allocate the new inode in a round-robin way.
Extend the inode table if needed.

Signed-off-by: Andiry Xu <jix024@cs.ucsd.edu>
---
fs/nova/inode.c | 40 ++++++++++++++++++++++++++++++++++++++++
fs/nova/inode.h | 1 +
2 files changed, 41 insertions(+)

diff --git a/fs/nova/inode.c b/fs/nova/inode.c
index 29d172a..e4b8960 100644
--- a/fs/nova/inode.c
+++ b/fs/nova/inode.c
@@ -489,6 +489,46 @@ int nova_free_inuse_inode(struct super_block *sb, unsigned long ino)
return ret;
}

+/* Returns 0 on failure */
+u64 nova_new_nova_inode(struct super_block *sb, u64 *pi_addr)
+{
+ struct nova_sb_info *sbi = NOVA_SB(sb);
+ struct inode_map *inode_map;
+ unsigned long free_ino = 0;
+ int map_id;
+ u64 ino = 0;
+ int ret;
+ timing_t new_inode_time;
+
+ NOVA_START_TIMING(new_nova_inode_t, new_inode_time);
+ map_id = sbi->map_id;
+ sbi->map_id = (sbi->map_id + 1) % sbi->cpus;
+
+ inode_map = &sbi->inode_maps[map_id];
+
+ mutex_lock(&inode_map->inode_table_mutex);
+ ret = nova_alloc_unused_inode(sb, map_id, &free_ino);
+ if (ret) {
+ nova_dbg("%s: alloc inode number failed %d\n", __func__, ret);
+ mutex_unlock(&inode_map->inode_table_mutex);
+ return 0;
+ }
+
+ ret = nova_get_inode_address(sb, free_ino, pi_addr, 1);
+ if (ret) {
+ nova_dbg("%s: get inode address failed %d\n", __func__, ret);
+ mutex_unlock(&inode_map->inode_table_mutex);
+ return 0;
+ }
+
+ mutex_unlock(&inode_map->inode_table_mutex);
+
+ ino = free_ino;
+
+ NOVA_END_TIMING(new_nova_inode_t, new_inode_time);
+ return ino;
+}
+
int nova_write_inode(struct inode *inode, struct writeback_control *wbc)
{
/* write_inode should never be called because we always keep our inodes
diff --git a/fs/nova/inode.h b/fs/nova/inode.h
index f9f5c14..fc1876c 100644
--- a/fs/nova/inode.h
+++ b/fs/nova/inode.h
@@ -229,6 +229,7 @@ int nova_get_inode_address(struct super_block *sb, u64 ino,
struct inode *nova_iget(struct super_block *sb, unsigned long ino);
inline int nova_insert_inodetree(struct nova_sb_info *sbi,
struct nova_range_node *new_node, int cpu);
+u64 nova_new_nova_inode(struct super_block *sb, u64 *pi_addr);
extern int nova_write_inode(struct inode *inode, struct writeback_control *wbc);
extern void nova_dirty_inode(struct inode *inode, int flags);

--
2.7.4