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Subject[RFC v2 17/83] Add statfs support.
Date
From: Andiry Xu <jix024@cs.ucsd.edu>

Signed-off-by: Andiry Xu <jix024@cs.ucsd.edu>
---
fs/nova/balloc.c | 18 ++++++++++++++++++
fs/nova/balloc.h | 1 +
fs/nova/super.c | 19 +++++++++++++++++++
3 files changed, 38 insertions(+)

diff --git a/fs/nova/balloc.c b/fs/nova/balloc.c
index cb627db..0742fe0 100644
--- a/fs/nova/balloc.c
+++ b/fs/nova/balloc.c
@@ -217,3 +217,21 @@ inline int nova_insert_blocktree(struct nova_sb_info *sbi,

return ret;
}
+
+/* We do not take locks so it's inaccurate */
+unsigned long nova_count_free_blocks(struct super_block *sb)
+{
+ struct nova_sb_info *sbi = NOVA_SB(sb);
+ struct free_list *free_list;
+ unsigned long num_free_blocks = 0;
+ int i;
+
+ for (i = 0; i < sbi->cpus; i++) {
+ free_list = nova_get_free_list(sb, i);
+ num_free_blocks += free_list->num_free_blocks;
+ }
+
+ return num_free_blocks;
+}
+
+
diff --git a/fs/nova/balloc.h b/fs/nova/balloc.h
index 57a93e4..537532e 100644
--- a/fs/nova/balloc.h
+++ b/fs/nova/balloc.h
@@ -66,6 +66,7 @@ inline struct nova_range_node *nova_alloc_blocknode(struct super_block *sb);
inline void nova_free_blocknode(struct super_block *sb,
struct nova_range_node *bnode);
extern void nova_init_blockmap(struct super_block *sb, int recovery);
+extern unsigned long nova_count_free_blocks(struct super_block *sb);
inline int nova_insert_blocktree(struct nova_sb_info *sbi,
struct rb_root *tree, struct nova_range_node *new_node);

diff --git a/fs/nova/super.c b/fs/nova/super.c
index 9762f26..3500d19 100644
--- a/fs/nova/super.c
+++ b/fs/nova/super.c
@@ -629,6 +629,24 @@ static int nova_fill_super(struct super_block *sb, void *data, int silent)
return retval;
}

+static int nova_statfs(struct dentry *d, struct kstatfs *buf)
+{
+ struct super_block *sb = d->d_sb;
+ struct nova_sb_info *sbi = (struct nova_sb_info *)sb->s_fs_info;
+
+ buf->f_type = NOVA_SUPER_MAGIC;
+ buf->f_bsize = sb->s_blocksize;
+
+ buf->f_blocks = sbi->num_blocks;
+ buf->f_bfree = buf->f_bavail = nova_count_free_blocks(sb);
+ buf->f_files = LONG_MAX;
+ buf->f_ffree = LONG_MAX - sbi->s_inodes_used_count;
+ buf->f_namelen = NOVA_NAME_LEN;
+ nova_dbg_verbose("nova_stats: total 4k free blocks 0x%llx\n",
+ buf->f_bfree);
+ return 0;
+}
+
static int nova_show_options(struct seq_file *seq, struct dentry *root)
{
struct nova_sb_info *sbi = NOVA_SB(root->d_sb);
@@ -794,6 +812,7 @@ static struct super_operations nova_sops = {
.alloc_inode = nova_alloc_inode,
.destroy_inode = nova_destroy_inode,
.put_super = nova_put_super,
+ .statfs = nova_statfs,
.remount_fs = nova_remount,
.show_options = nova_show_options,
};
--
2.7.4
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