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/* $Id: jffs2_fs_sb.h,v 1.1 2004-01-28 15:25:48 giacomo Exp $ */

#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 <asm/semaphore.h>
#include <linux/timer.h>
#include <linux/wait.h>
#include <linux/list.h>

#define JFFS2_SB_FLAG_RO 1
#define JFFS2_SB_FLAG_MOUNTING 2

struct jffs2_inodirty;

/* 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 semaphore gc_thread_start; /* GC thread start mutex */
        struct completion gc_thread_exit; /* GC thread exit completion port */

        struct semaphore 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 */

        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_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;
        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 semaphore erase_free_sem;

#ifdef CONFIG_JFFS2_FS_NAND
        /* Write-behind buffer for NAND flash */
        unsigned char *wbuf;
        uint32_t wbuf_ofs;
        uint32_t wbuf_len;
        uint32_t wbuf_pagesize;
        struct jffs2_inodirty *wbuf_inodes;

        /* Information about out-of-band area usage... */
        struct nand_oobinfo *oobinfo;
        uint32_t badblock_pos;
        uint32_t fsdata_pos;
        uint32_t fsdata_len;
#endif

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

#endif /* _JFFS2_FB_SB */