fs: expand dump_inode()

This adds fs name and few fields from struct inode: i_mode, i_opflags,
i_flags, i_state and i_count.

All values printed raw, no attempt to pretty-print anything.

Compile tested on i386 and runtime tested on amd64.

Sample output:
[   23.121281] VFS_WARN_ON_INODE("crap") encountered for inode ffff9a1a83ce3660
               fs pipefs mode 10600 opflags 0x4 flags 0x0 state 0x38 count 0

Signed-off-by: Mateusz Guzik <mjguzik@gmail.com>

Author: mjguzik

fs/inode.c

@@ -2935,10 +2935,18 @@ EXPORT_SYMBOL(mode_strip_sgid);
  *
  * TODO: add a proper inode dumping routine, this is a stub to get debug off the
  * ground.
+ *
+ * TODO: handle getting to fs type with get_kernel_nofault()?
+ * See dump_mapping() above.
  */
 void dump_inode(struct inode *inode, const char *reason)
 {
-	pr_warn("%s encountered for inode %px", reason, inode);
+	struct super_block *sb = inode->i_sb;
+
+	pr_warn("%s encountered for inode %px\n"
+		"fs %s mode %ho opflags 0x%hx flags 0x%x state 0x%x count %d\n",
+		reason, inode, sb->s_type->name, inode->i_mode, inode->i_opflags,
+		inode->i_flags, inode->i_state, atomic_read(&inode->i_count));
 }
 
 EXPORT_SYMBOL(dump_inode);