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>

1 files changed, 56 insertions, 60 deletions

diff --git a/fs/pstore/inode.c b/fs/pstore/inode.c
index 549d245d0b42..08342232cb1c 100644
--- 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,
 };