[PATCH 28/31] IGET: Stop OPENPROMFS from using iget() and read_inode() [try #5]

David Howells
2007-10-25T16:45:57Z

Stop the OPENPROMFS filesystem from using iget() and read_inode(). Replace
openpromfs_read_inode() with openpromfs_iget(), and call that instead of
iget(). openpromfs_iget() then uses iget_locked() directly and returns a
proper error code instead of an inode in the event of an error.

openpromfs_fill_super() returns any error incurred when getting the root inode
instead of ENOMEM (not that it currently incurs any other error).

Signed-off-by: David Howells <dhowells@redhat.com>
---

fs/openpromfs/inode.c | 45 ++++++++++++++++++++++++++++++---------------
1 files changed, 30 insertions(+), 15 deletions(-)

diff --git a/fs/openpromfs/inode.c b/fs/openpromfs/inode.c
index d881738..554586b 100644
--- a/fs/openpromfs/inode.c
+++ b/fs/openpromfs/inode.c
@@ -38,6 +38,8 @@ struct op_inode_info {
union op_inode_data u;
};

+static struct inode *openprom_iget(struct super_block *sb, ino_t ino);
+
static inline struct op_inode_info *OP_I(struct inode *inode)
{
return container_of(inode, struct op_inode_info, vfs_inode);
@@ -226,10 +228,10 @@ static struct dentry *openpromfs_lookup(struct inode *dir, struct dentry *dentry
return ERR_PTR(-ENOENT);

found:
- inode = iget(dir->i_sb, ino);
+ inode = openprom_iget(dir->i_sb, ino);
mutex_unlock(&op_mutex);
- if (!inode)
- return ERR_PTR(-EINVAL);
+ if (IS_ERR(inode))
+ return ERR_CAST(inode);
ent_oi = OP_I(inode);
ent_oi->type = ent_type;
ent_oi->u = ent_data;
@@ -348,14 +350,23 @@ static void openprom_destroy_inode(struct inode *inode)
kmem_cache_free(op_inode_cachep, OP_I(inode));
}

-static void openprom_read_inode(struct inode * inode)
+static struct inode *openprom_iget(struct super_block *sb, ino_t ino)
{
- inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
- if (inode->i_ino == OPENPROM_ROOT_INO) {
- inode->i_op = &openprom_inode_operations;
- inode->i_fop = &openprom_operations;
- inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
+ struct inode *inode;
+
+ inode = iget_locked(sb, ino);
+ if (!inode)
+ return ERR_PTR(-ENOMEM);
+ if (inode->i_state & I_NEW) {
+ inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
+ if (inode->i_ino == OPENPROM_ROOT_INO) {
+ inode->i_op = &openprom_inode_operations;
+ inode->i_fop = &openprom_operations;
+ inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
+ }
+ unlock_new_inode(inode);
}
+ return inode;
}

static int openprom_remount(struct super_block *sb, int *flags, char *data)
@@ -367,7 +378,6 @@ static int openprom_remount(struct super_block *sb, int *flags, char *data)
static const struct super_operations openprom_sops = {
.alloc_inode = openprom_alloc_inode,
.destroy_inode = openprom_destroy_inode,
- .read_inode = openprom_read_inode,
.statfs = simple_statfs,
.remount_fs = openprom_remount,
};
@@ -376,6 +386,7 @@ static int openprom_fill_super(struct super_block *s, void *data, int silent)
{
struct inode *root_inode;
struct op_inode_info *oi;
+ int ret;

s->s_flags |= MS_NOATIME;
s->s_blocksize = 1024;
@@ -383,9 +394,11 @@ static int openprom_fill_super(struct super_block *s, void *data, int silent)
s->s_magic = OPENPROM_SUPER_MAGIC;
s->s_op = &openprom_sops;
s->s_time_gran = 1;
- root_inode = iget(s, OPENPROM_ROOT_INO);
- if (!root_inode)
+ root_inode = openprom_iget(s, OPENPROM_ROOT_INO);
+ if (IS_ERR(root_inode)) {
+ ret = PTR_ERR(root_inode);
goto out_no_root;
+ }

oi = OP_I(root_inode);
oi->type = op_inode_node;
@@ -393,13 +406,15 @@ static int openprom_fill_super(struct super_block *s, void *data, int silent)

s->s_root = d_alloc_root(root_inode);
if (!s->s_root)
- goto out_no_root;
+ goto out_no_root_dentry;
return 0;

+out_no_root_dentry:
+ iput(root_inode);
+ ret = -ENOMEM;
out_no_root:
printk("openprom_fill_super: get root inode failed\n");
- iput(root_inode);
- return -ENOMEM;
+ return ret;
}

static int openprom_get_sb(struct file_system_type *fs_type,