+static struct inode *ubifs_alloc_inode(struct super_block *sb)
+{
+ struct ubifs_inode *ui;
+
+ ui = kmem_cache_alloc(ubifs_inode_slab, GFP_NOFS);
+ if (!ui)
+ return NULL;
+
+ memset((void *)ui + sizeof(struct inode), 0,
+ sizeof(struct ubifs_inode) - sizeof(struct inode));
+ mutex_init(&ui->ui_mutex);
+ spin_lock_init(&ui->ui_lock);
+ return &ui->vfs_inode;
+};
+
+#ifndef __UBOOT__
+static void ubifs_i_callback(struct rcu_head *head)
+{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ struct ubifs_inode *ui = ubifs_inode(inode);
+ kmem_cache_free(ubifs_inode_slab, ui);
+}
+
+static void ubifs_destroy_inode(struct inode *inode)
+{
+ struct ubifs_inode *ui = ubifs_inode(inode);
+
+ kfree(ui->data);
+ call_rcu(&inode->i_rcu, ubifs_i_callback);
+}
+
+/*
+ * Note, Linux write-back code calls this without 'i_mutex'.
+ */
+static int ubifs_write_inode(struct inode *inode, struct writeback_control *wbc)
+{
+ int err = 0;
+ struct ubifs_info *c = inode->i_sb->s_fs_info;
+ struct ubifs_inode *ui = ubifs_inode(inode);
+
+ ubifs_assert(!ui->xattr);
+ if (is_bad_inode(inode))
+ return 0;
+
+ mutex_lock(&ui->ui_mutex);
+ /*
+ * Due to races between write-back forced by budgeting
+ * (see 'sync_some_inodes()') and background write-back, the inode may
+ * have already been synchronized, do not do this again. This might
+ * also happen if it was synchronized in an VFS operation, e.g.
+ * 'ubifs_link()'.
+ */
+ if (!ui->dirty) {
+ mutex_unlock(&ui->ui_mutex);
+ return 0;
+ }
+
+ /*
+ * As an optimization, do not write orphan inodes to the media just
+ * because this is not needed.
+ */
+ dbg_gen("inode %lu, mode %#x, nlink %u",
+ inode->i_ino, (int)inode->i_mode, inode->i_nlink);
+ if (inode->i_nlink) {
+ err = ubifs_jnl_write_inode(c, inode);
+ if (err)
+ ubifs_err("can't write inode %lu, error %d",
+ inode->i_ino, err);
+ else
+ err = dbg_check_inode_size(c, inode, ui->ui_size);
+ }
+
+ ui->dirty = 0;
+ mutex_unlock(&ui->ui_mutex);
+ ubifs_release_dirty_inode_budget(c, ui);
+ return err;
+}
+
+static void ubifs_evict_inode(struct inode *inode)
+{
+ int err;
+ struct ubifs_info *c = inode->i_sb->s_fs_info;
+ struct ubifs_inode *ui = ubifs_inode(inode);
+
+ if (ui->xattr)
+ /*
+ * Extended attribute inode deletions are fully handled in
+ * 'ubifs_removexattr()'. These inodes are special and have
+ * limited usage, so there is nothing to do here.
+ */
+ goto out;
+
+ dbg_gen("inode %lu, mode %#x", inode->i_ino, (int)inode->i_mode);
+ ubifs_assert(!atomic_read(&inode->i_count));
+
+ truncate_inode_pages_final(&inode->i_data);
+
+ if (inode->i_nlink)
+ goto done;
+
+ if (is_bad_inode(inode))
+ goto out;
+
+ ui->ui_size = inode->i_size = 0;
+ err = ubifs_jnl_delete_inode(c, inode);
+ if (err)
+ /*
+ * Worst case we have a lost orphan inode wasting space, so a
+ * simple error message is OK here.
+ */
+ ubifs_err("can't delete inode %lu, error %d",
+ inode->i_ino, err);
+
+out:
+ if (ui->dirty)
+ ubifs_release_dirty_inode_budget(c, ui);
+ else {
+ /* We've deleted something - clean the "no space" flags */
+ c->bi.nospace = c->bi.nospace_rp = 0;
+ smp_wmb();
+ }
+done:
+ clear_inode(inode);
+}
+#endif
+
+static void ubifs_dirty_inode(struct inode *inode, int flags)
+{
+ struct ubifs_inode *ui = ubifs_inode(inode);
+
+ ubifs_assert(mutex_is_locked(&ui->ui_mutex));
+ if (!ui->dirty) {
+ ui->dirty = 1;
+ dbg_gen("inode %lu", inode->i_ino);
+ }
+}
+
+#ifndef __UBOOT__
+static int ubifs_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+ struct ubifs_info *c = dentry->d_sb->s_fs_info;
+ unsigned long long free;
+ __le32 *uuid = (__le32 *)c->uuid;
+
+ free = ubifs_get_free_space(c);
+ dbg_gen("free space %lld bytes (%lld blocks)",
+ free, free >> UBIFS_BLOCK_SHIFT);
+
+ buf->f_type = UBIFS_SUPER_MAGIC;
+ buf->f_bsize = UBIFS_BLOCK_SIZE;
+ buf->f_blocks = c->block_cnt;
+ buf->f_bfree = free >> UBIFS_BLOCK_SHIFT;
+ if (free > c->report_rp_size)
+ buf->f_bavail = (free - c->report_rp_size) >> UBIFS_BLOCK_SHIFT;
+ else
+ buf->f_bavail = 0;
+ buf->f_files = 0;
+ buf->f_ffree = 0;
+ buf->f_namelen = UBIFS_MAX_NLEN;
+ buf->f_fsid.val[0] = le32_to_cpu(uuid[0]) ^ le32_to_cpu(uuid[2]);
+ buf->f_fsid.val[1] = le32_to_cpu(uuid[1]) ^ le32_to_cpu(uuid[3]);
+ ubifs_assert(buf->f_bfree <= c->block_cnt);
+ return 0;
+}
+
+static int ubifs_show_options(struct seq_file *s, struct dentry *root)
+{
+ struct ubifs_info *c = root->d_sb->s_fs_info;
+
+ if (c->mount_opts.unmount_mode == 2)
+ seq_printf(s, ",fast_unmount");
+ else if (c->mount_opts.unmount_mode == 1)
+ seq_printf(s, ",norm_unmount");
+
+ if (c->mount_opts.bulk_read == 2)
+ seq_printf(s, ",bulk_read");
+ else if (c->mount_opts.bulk_read == 1)
+ seq_printf(s, ",no_bulk_read");
+
+ if (c->mount_opts.chk_data_crc == 2)
+ seq_printf(s, ",chk_data_crc");
+ else if (c->mount_opts.chk_data_crc == 1)
+ seq_printf(s, ",no_chk_data_crc");
+
+ if (c->mount_opts.override_compr) {
+ seq_printf(s, ",compr=%s",
+ ubifs_compr_name(c->mount_opts.compr_type));
+ }
+
+ return 0;
+}
+
+static int ubifs_sync_fs(struct super_block *sb, int wait)
+{
+ int i, err;
+ struct ubifs_info *c = sb->s_fs_info;
+
+ /*
+ * Zero @wait is just an advisory thing to help the file system shove
+ * lots of data into the queues, and there will be the second
+ * '->sync_fs()' call, with non-zero @wait.
+ */
+ if (!wait)
+ return 0;
+
+ /*
+ * Synchronize write buffers, because 'ubifs_run_commit()' does not
+ * do this if it waits for an already running commit.
+ */
+ for (i = 0; i < c->jhead_cnt; i++) {
+ err = ubifs_wbuf_sync(&c->jheads[i].wbuf);
+ if (err)
+ return err;
+ }
+
+ /*
+ * Strictly speaking, it is not necessary to commit the journal here,
+ * synchronizing write-buffers would be enough. But committing makes
+ * UBIFS free space predictions much more accurate, so we want to let
+ * the user be able to get more accurate results of 'statfs()' after
+ * they synchronize the file system.
+ */
+ err = ubifs_run_commit(c);
+ if (err)
+ return err;
+
+ return ubi_sync(c->vi.ubi_num);
+}
+#endif
+