/*
   * JFFS2 -- Journalling Flash File System, Version 2.
   *
   * Copyright © 2001-2007 Red Hat, Inc.

   * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org>

   *
   * Created by David Woodhouse <dwmw2@infradead.org>
   *
   * For licensing information, see the file 'LICENCE' in this directory.
   *
   */

  
  #ifndef _JFFS2_FS_SB
  #define _JFFS2_FS_SB
  
  #include <linux/types.h>
  #include <linux/spinlock.h>
  #include <linux/workqueue.h>
  #include <linux/completion.h>

  #include <linux/mutex.h>

  #include <linux/timer.h>
  #include <linux/wait.h>
  #include <linux/list.h>
  #include <linux/rwsem.h>
  
  #define JFFS2_SB_FLAG_RO 1

  #define JFFS2_SB_FLAG_SCANNING 2 /* Flash scanning is in progress */
  #define JFFS2_SB_FLAG_BUILDING 4 /* File system building is in progress */

  
  struct jffs2_inodirty;

  struct jffs2_mount_opts {
  	bool override_compr;
  	unsigned int compr;
  };

  /* A struct for the overall file system control.  Pointers to

     jffs2_sb_info structs are named `c' in the source code.

     Nee jffs_control
  */
  struct jffs2_sb_info {
  	struct mtd_info *mtd;
  
  	uint32_t highest_ino;
  	uint32_t checked_ino;
  
  	unsigned int flags;
  
  	struct task_struct *gc_task;	/* GC task struct */

  	struct completion gc_thread_start; /* GC thread start completion */

  	struct completion gc_thread_exit; /* GC thread exit completion port */

  	struct mutex alloc_sem;		/* Used to protect all the following

  					   fields, and also to protect against
  					   out-of-order writing of nodes. And GC. */
  	uint32_t cleanmarker_size;	/* Size of an _inline_ CLEANMARKER
  					 (i.e. zero for OOB CLEANMARKER */
  
  	uint32_t flash_size;
  	uint32_t used_size;
  	uint32_t dirty_size;
  	uint32_t wasted_size;
  	uint32_t free_size;
  	uint32_t erasing_size;
  	uint32_t bad_size;
  	uint32_t sector_size;
  	uint32_t unchecked_size;
  
  	uint32_t nr_free_blocks;
  	uint32_t nr_erasing_blocks;
  
  	/* Number of free blocks there must be before we... */
  	uint8_t resv_blocks_write;	/* ... allow a normal filesystem write */
  	uint8_t resv_blocks_deletion;	/* ... allow a normal filesystem deletion */
  	uint8_t resv_blocks_gctrigger;	/* ... wake up the GC thread */
  	uint8_t resv_blocks_gcbad;	/* ... pick a block from the bad_list to GC */
  	uint8_t resv_blocks_gcmerge;	/* ... merge pages when garbage collecting */

  	/* Number of 'very dirty' blocks before we trigger immediate GC */
  	uint8_t vdirty_blocks_gctrigger;

  
  	uint32_t nospc_dirty_size;
  
  	uint32_t nr_blocks;

  	struct jffs2_eraseblock *blocks;	/* The whole array of blocks. Used for getting blocks

  						 * from the offset (blocks[ofs / sector_size]) */
  	struct jffs2_eraseblock *nextblock;	/* The block we're currently filling */
  
  	struct jffs2_eraseblock *gcblock;	/* The block we're currently garbage-collecting */
  
  	struct list_head clean_list;		/* Blocks 100% full of clean data */
  	struct list_head very_dirty_list;	/* Blocks with lots of dirty space */
  	struct list_head dirty_list;		/* Blocks with some dirty space */
  	struct list_head erasable_list;		/* Blocks which are completely dirty, and need erasing */
  	struct list_head erasable_pending_wbuf_list;	/* Blocks which need erasing but only after the current wbuf is flushed */
  	struct list_head erasing_list;		/* Blocks which are currently erasing */

  	struct list_head erase_checking_list;	/* Blocks which are being checked and marked */

  	struct list_head erase_pending_list;	/* Blocks which need erasing now */
  	struct list_head erase_complete_list;	/* Blocks which are erased and need the clean marker written to them */
  	struct list_head free_list;		/* Blocks which are free and ready to be used */
  	struct list_head bad_list;		/* Bad blocks. */
  	struct list_head bad_used_list;		/* Bad blocks with valid data in. */

  	spinlock_t erase_completion_lock;	/* Protect free_list and erasing_list

  						   against erase completion handler */
  	wait_queue_head_t erase_wait;		/* For waiting for erases to complete */
  
  	wait_queue_head_t inocache_wq;

  	int inocache_hashsize;

  	struct jffs2_inode_cache **inocache_list;
  	spinlock_t inocache_lock;

  	/* Sem to allow jffs2_garbage_collect_deletion_dirent to

  	   drop the erase_completion_lock while it's holding a pointer

  	   to an obsoleted node. I don't like this. Alternatives welcomed. */

  	struct mutex erase_free_sem;

  	uint32_t wbuf_pagesize; /* 0 for NOR and other flashes with no wbuf */

  #ifdef CONFIG_JFFS2_FS_WBUF_VERIFY
  	unsigned char *wbuf_verify; /* read-back buffer for verification */
  #endif

  #ifdef CONFIG_JFFS2_FS_WRITEBUFFER

  	unsigned char *wbuf; /* Write-behind buffer for NAND flash */

  	uint32_t wbuf_ofs;
  	uint32_t wbuf_len;

  	struct jffs2_inodirty *wbuf_inodes;

  	struct rw_semaphore wbuf_sem;	/* Protects the write buffer */

  	unsigned char *oobbuf;
  	int oobavail; /* How many bytes are available for JFFS2 in OOB */

  #endif

  	struct jffs2_summary *summary;		/* Summary information */

  	struct jffs2_mount_opts mount_opts;

  #ifdef CONFIG_JFFS2_FS_XATTR
  #define XATTRINDEX_HASHSIZE	(57)
  	uint32_t highest_xid;

  	uint32_t highest_xseqno;

  	struct list_head xattrindex[XATTRINDEX_HASHSIZE];

  	struct list_head xattr_unchecked;

  	struct list_head xattr_dead_list;
  	struct jffs2_xattr_ref *xref_dead_list;

  	struct jffs2_xattr_ref *xref_temp;

  	struct rw_semaphore xattr_sem;
  	uint32_t xdatum_mem_usage;
  	uint32_t xdatum_mem_threshold;
  #endif

  	/* OS-private pointer for getting back to master superblock info */
  	void *os_priv;
  };

  #endif /* _JFFS2_FS_SB */