Subversion Repositories openrisc

/* $Id: jffs2_fs_sb.h,v 1.52 2005/05/19 16:12:17 gleixner 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>

#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;

/* 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 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_WRITEBUFFER

        /* 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;

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

        /* 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 */