Some fixes for pstore

1) Change from ->get_sb() to ->mount()
2) Use mount_single() instead of mount_nodev()
3) Pulled in ramfs_get_inode() & trimmed to what I need for pstore
4) Drop the ugly pstore_writefile() Just save data using kmalloc() and
   provide a pstore_file_read() that uses simple_read_from_buffer().

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/pstore/inode.c b/fs/pstore/inode.c
index 549d245..0834223 100644 (file)
--- a/fs/pstore/inode.c
+++ b/fs/pstore/inode.c
@@ -40,9 +40,29 @@
 struct pstore_private {
        u64     id;
        int     (*erase)(u64);
+       ssize_t size;
+       char    data[];
 };
 
-#define pstore_get_inode ramfs_get_inode
+static int pstore_file_open(struct inode *inode, struct file *file)
+{
+       file->private_data = inode->i_private;
+       return 0;
+}
+
+static ssize_t pstore_file_read(struct file *file, char __user *userbuf,
+                                               size_t count, loff_t *ppos)
+{
+       struct pstore_private *ps = file->private_data;
+
+       return simple_read_from_buffer(userbuf, count, ppos, ps->data, ps->size);
+}
+
+static const struct file_operations pstore_file_operations = {
+       .open   = pstore_file_open,
+       .read   = pstore_file_read,
+       .llseek = default_llseek,
+};
 
 /*
  * When a file is unlinked from our file system we call the
@@ -63,6 +83,30 @@ static const struct inode_operations pstore_dir_inode_operations = {
        .unlink         = pstore_unlink,
 };
 
+static struct inode *pstore_get_inode(struct super_block *sb,
+                                       const struct inode *dir, int mode, dev_t dev)
+{
+       struct inode *inode = new_inode(sb);
+
+       if (inode) {
+               inode->i_ino = get_next_ino();
+               inode->i_uid = inode->i_gid = 0;
+               inode->i_mode = mode;
+               inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+               switch (mode & S_IFMT) {
+               case S_IFREG:
+                       inode->i_fop = &pstore_file_operations;
+                       break;
+               case S_IFDIR:
+                       inode->i_op = &pstore_dir_inode_operations;
+                       inode->i_fop = &simple_dir_operations;
+                       inc_nlink(inode);
+                       break;
+               }
+       }
+       return inode;
+}
+
 static const struct super_operations pstore_ops = {
        .statfs         = simple_statfs,
        .drop_inode     = generic_delete_inode,
@@ -70,37 +114,10 @@ static const struct super_operations pstore_ops = {
 };
 
 static struct super_block *pstore_sb;
-static struct vfsmount *pstore_mnt;
 
 int pstore_is_mounted(void)
 {
-       return pstore_mnt != NULL;
-}
-
-/*
- * Set up a file structure as if we had opened this file and
- * write our data to it.
- */
-static int pstore_writefile(struct inode *inode, struct dentry *dentry,
-       char *data, size_t size)
-{
-       struct file f;
-       ssize_t n;
-       mm_segment_t old_fs = get_fs();
-
-       memset(&f, '0', sizeof f);
-       f.f_mapping = inode->i_mapping;
-       f.f_path.dentry = dentry;
-       f.f_path.mnt = pstore_mnt;
-       f.f_pos = 0;
-       f.f_op = inode->i_fop;
-       set_fs(KERNEL_DS);
-       n = do_sync_write(&f, data, size, &f.f_pos);
-       set_fs(old_fs);
-
-       fsnotify_modify(&f);
-
-       return n == size;
+       return pstore_sb != NULL;
 }
 
 /*
@@ -123,8 +140,7 @@ int pstore_mkfile(enum pstore_type_id type, char *psname, u64 id,
        inode = pstore_get_inode(pstore_sb, root->d_inode, S_IFREG | 0444, 0);
        if (!inode)
                goto fail;
-       inode->i_uid = inode->i_gid = 0;
-       private = kmalloc(sizeof *private, GFP_KERNEL);
+       private = kmalloc(sizeof *private + size, GFP_KERNEL);
        if (!private)
                goto fail_alloc;
        private->id = id;
@@ -152,28 +168,19 @@ int pstore_mkfile(enum pstore_type_id type, char *psname, u64 id,
        if (IS_ERR(dentry))
                goto fail_lockedalloc;
 
-       d_add(dentry, inode);
-
-       mutex_unlock(&root->d_inode->i_mutex);
-
-       if (!pstore_writefile(inode, dentry, data, size))
-               goto fail_write;
+       memcpy(private->data, data, size);
+       inode->i_size = private->size = size;
 
        inode->i_private = private;
 
        if (time.tv_sec)
                inode->i_mtime = inode->i_ctime = time;
 
-       return 0;
+       d_add(dentry, inode);
 
-fail_write:
-       kfree(private);
-       inode->i_nlink--;
-       mutex_lock(&root->d_inode->i_mutex);
-       d_delete(dentry);
-       dput(dentry);
        mutex_unlock(&root->d_inode->i_mutex);
-       goto fail;
+
+       return 0;
 
 fail_lockedalloc:
        mutex_unlock(&root->d_inode->i_mutex);
@@ -225,32 +232,21 @@ fail:
        return err;
 }
 
-static int pstore_get_sb(struct file_system_type *fs_type,
-       int flags, const char *dev_name, void *data, struct vfsmount *mnt)
+static struct dentry *pstore_mount(struct file_system_type *fs_type,
+       int flags, const char *dev_name, void *data)
 {
-       struct dentry *root;
-
-       root = mount_nodev(fs_type, flags, data, pstore_fill_super);
-       if (IS_ERR(root))
-               return -ENOMEM;
-
-       mnt->mnt_root = root;
-       mnt->mnt_sb = root->d_sb;
-       pstore_mnt = mnt;
-
-       return 0;
+       return mount_single(fs_type, flags, data, pstore_fill_super);
 }
 
 static void pstore_kill_sb(struct super_block *sb)
 {
        kill_litter_super(sb);
        pstore_sb = NULL;
-       pstore_mnt = NULL;
 }
 
 static struct file_system_type pstore_fs_type = {
        .name           = "pstore",
-       .get_sb         = pstore_get_sb,
+       .mount          = pstore_mount,
        .kill_sb        = pstore_kill_sb,
 };