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

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Date:   Sat, 10 Mar 2018 10:18:11 -0800
From:   Andiry Xu <jix024@....ucsd.edu>
To:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-nvdimm@...ts.01.org
Cc:     dan.j.williams@...el.com, andy.rudoff@...el.com,
        coughlan@...hat.com, swanson@...ucsd.edu, david@...morbit.com,
        jack@...e.com, swhiteho@...hat.com, miklos@...redi.hu,
        andiry.xu@...il.com, Andiry Xu <jix024@...ucsd.edu>
Subject: [RFC v2 30/83] New NOVA inode allocation.

From: Andiry Xu <jix024@...ucsd.edu>

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

Signed-off-by: Andiry Xu <jix024@...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