hostfs: don't keep a field in each inode when we are using it only in root
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/hostfs/hostfs_kern.c b/fs/hostfs/hostfs_kern.c
index fab5f5a..7e67504 100644
--- a/fs/hostfs/hostfs_kern.c
+++ b/fs/hostfs/hostfs_kern.c
@@ -19,7 +19,6 @@
#include "kern.h"
struct hostfs_inode_info {
- char *host_filename;
int fd;
fmode_t mode;
struct inode vfs_inode;
@@ -103,7 +102,7 @@
parent = parent->d_parent;
}
- root = HOSTFS_I(parent->d_inode)->host_filename;
+ root = parent->d_sb->s_fs_info;
len += strlen(root);
name = kmalloc(len + extra + 1, GFP_KERNEL);
if (name == NULL)
@@ -266,7 +265,7 @@
long long f_files;
long long f_ffree;
- err = do_statfs(HOSTFS_I(dentry->d_sb->s_root->d_inode)->host_filename,
+ err = do_statfs(dentry->d_sb->s_fs_info,
&sf->f_bsize, &f_blocks, &f_bfree, &f_bavail, &f_files,
&f_ffree, &sf->f_fsid, sizeof(sf->f_fsid),
&sf->f_namelen, sf->f_spare);
@@ -285,13 +284,10 @@
{
struct hostfs_inode_info *hi;
- hi = kmalloc(sizeof(*hi), GFP_KERNEL);
+ hi = kzalloc(sizeof(*hi), GFP_KERNEL);
if (hi == NULL)
return NULL;
-
- *hi = ((struct hostfs_inode_info) { .host_filename = NULL,
- .fd = -1,
- .mode = 0 });
+ hi->fd = -1;
inode_init_once(&hi->vfs_inode);
return &hi->vfs_inode;
}
@@ -308,14 +304,12 @@
static void hostfs_destroy_inode(struct inode *inode)
{
- kfree(HOSTFS_I(inode)->host_filename);
kfree(HOSTFS_I(inode));
}
static int hostfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
{
- struct inode *root = vfs->mnt_sb->s_root->d_inode;
- const char *root_path = HOSTFS_I(root)->host_filename;
+ const char *root_path = vfs->mnt_sb->s_fs_info;
size_t offset = strlen(root_ino) + 1;
if (strlen(root_path) > offset)
@@ -978,8 +972,8 @@
req_root = "";
err = -ENOMEM;
- host_root_path = kmalloc(strlen(root_ino) + 1
- + strlen(req_root) + 1, GFP_KERNEL);
+ sb->s_fs_info = host_root_path =
+ kmalloc(strlen(root_ino) + strlen(req_root) + 2, GFP_KERNEL);
if (host_root_path == NULL)
goto out;
@@ -988,20 +982,13 @@
root_inode = hostfs_iget(sb);
if (IS_ERR(root_inode)) {
err = PTR_ERR(root_inode);
- goto out_free;
+ goto out;
}
err = init_inode(root_inode, NULL);
if (err)
goto out_put;
- HOSTFS_I(root_inode)->host_filename = host_root_path;
- /*
- * Avoid that in the error path, iput(root_inode) frees again
- * host_root_path through hostfs_destroy_inode!
- */
- host_root_path = NULL;
-
err = -ENOMEM;
sb->s_root = d_alloc_root(root_inode);
if (sb->s_root == NULL)
@@ -1019,8 +1006,6 @@
out_put:
iput(root_inode);
-out_free:
- kfree(host_root_path);
out:
return err;
}
@@ -1032,11 +1017,17 @@
return get_sb_nodev(type, flags, data, hostfs_fill_sb_common, mnt);
}
+static void hostfs_kill_sb(struct super_block *s)
+{
+ kill_anon_super(s);
+ kfree(s->s_fs_info);
+}
+
static struct file_system_type hostfs_type = {
.owner = THIS_MODULE,
.name = "hostfs",
.get_sb = hostfs_read_sb,
- .kill_sb = kill_anon_super,
+ .kill_sb = hostfs_kill_sb,
.fs_flags = 0,
};