include/linux/jffs2_fs_sb.h

   1 /* $Id: jffs2_fs_sb.h,v 1.48 2004/11/20 10:41:12 dwmw2 Exp $ */
   2
   3 #ifndef _JFFS2_FS_SB
   4 #define _JFFS2_FS_SB
   5
   6 #include <linux/types.h>
   7 #include <linux/spinlock.h>
   8 #include <linux/workqueue.h>
   9 #include <linux/completion.h>
  10 #include <asm/semaphore.h>
  11 #include <linux/timer.h>
  12 #include <linux/wait.h>
  13 #include <linux/list.h>
  14 #include <linux/rwsem.h>
  15
  16 #define JFFS2_SB_FLAG_RO 1
  17 #define JFFS2_SB_FLAG_MOUNTING 2
  18
  19 struct jffs2_inodirty;
  20
  21 /* A struct for the overall file system control.  Pointers to
  22    jffs2_sb_info structs are named `c' in the source code.
  23    Nee jffs_control
  24 */
  25 struct jffs2_sb_info {
  26         struct mtd_info *mtd;
  27
  28         uint32_t highest_ino;
  29         uint32_t checked_ino;
  30
  31         unsigned int flags;
  32
  33         struct task_struct *gc_task;    /* GC task struct */
  34         struct semaphore gc_thread_start; /* GC thread start mutex */
  35         struct completion gc_thread_exit; /* GC thread exit completion port */
  36
  37         struct semaphore alloc_sem;     /* Used to protect all the following
  38                                            fields, and also to protect against
  39                                            out-of-order writing of nodes. And GC. */
  40         uint32_t cleanmarker_size;      /* Size of an _inline_ CLEANMARKER
  41                                          (i.e. zero for OOB CLEANMARKER */
  42
  43         uint32_t flash_size;
  44         uint32_t used_size;
  45         uint32_t dirty_size;
  46         uint32_t wasted_size;
  47         uint32_t free_size;
  48         uint32_t erasing_size;
  49         uint32_t bad_size;
  50         uint32_t sector_size;
  51         uint32_t unchecked_size;
  52
  53         uint32_t nr_free_blocks;
  54         uint32_t nr_erasing_blocks;
  55
  56         /* Number of free blocks there must be before we... */
  57         uint8_t resv_blocks_write;      /* ... allow a normal filesystem write */
  58         uint8_t resv_blocks_deletion;   /* ... allow a normal filesystem deletion */
  59         uint8_t resv_blocks_gctrigger;  /* ... wake up the GC thread */
  60         uint8_t resv_blocks_gcbad;      /* ... pick a block from the bad_list to GC */
  61         uint8_t resv_blocks_gcmerge;    /* ... merge pages when garbage collecting */
  62
  63         uint32_t nospc_dirty_size;
  64
  65         uint32_t nr_blocks;
  66         struct jffs2_eraseblock *blocks;        /* The whole array of blocks. Used for getting blocks
  67                                                  * from the offset (blocks[ofs / sector_size]) */
  68         struct jffs2_eraseblock *nextblock;     /* The block we're currently filling */
  69
  70         struct jffs2_eraseblock *gcblock;       /* The block we're currently garbage-collecting */
  71
  72         struct list_head clean_list;            /* Blocks 100% full of clean data */
  73         struct list_head very_dirty_list;       /* Blocks with lots of dirty space */
  74         struct list_head dirty_list;            /* Blocks with some dirty space */
  75         struct list_head erasable_list;         /* Blocks which are completely dirty, and need erasing */
  76         struct list_head erasable_pending_wbuf_list;    /* Blocks which need erasing but only after the current wbuf is flushed */
  77         struct list_head erasing_list;          /* Blocks which are currently erasing */
  78         struct list_head erase_pending_list;    /* Blocks which need erasing now */
  79         struct list_head erase_complete_list;   /* Blocks which are erased and need the clean marker written to them */
  80         struct list_head free_list;             /* Blocks which are free and ready to be used */
  81         struct list_head bad_list;              /* Bad blocks. */
  82         struct list_head bad_used_list;         /* Bad blocks with valid data in. */
  83
  84         spinlock_t erase_completion_lock;       /* Protect free_list and erasing_list
  85                                                    against erase completion handler */
  86         wait_queue_head_t erase_wait;           /* For waiting for erases to complete */
  87
  88         wait_queue_head_t inocache_wq;
  89         struct jffs2_inode_cache **inocache_list;
  90         spinlock_t inocache_lock;
  91
  92         /* Sem to allow jffs2_garbage_collect_deletion_dirent to
  93            drop the erase_completion_lock while it's holding a pointer
  94            to an obsoleted node. I don't like this. Alternatives welcomed. */
  95         struct semaphore erase_free_sem;
  96
  97 #if defined CONFIG_JFFS2_FS_NAND || defined CONFIG_JFFS2_FS_NOR_ECC
  98         /* Write-behind buffer for NAND flash */
  99         unsigned char *wbuf;
 100         uint32_t wbuf_ofs;
 101         uint32_t wbuf_len;
 102         uint32_t wbuf_pagesize;
 103         struct jffs2_inodirty *wbuf_inodes;
 104
 105         struct rw_semaphore wbuf_sem;   /* Protects the write buffer */
 106
 107         /* Information about out-of-band area usage... */
 108         struct nand_oobinfo *oobinfo;
 109         uint32_t badblock_pos;
 110         uint32_t fsdata_pos;
 111         uint32_t fsdata_len;
 112 #endif
 113
 114         /* OS-private pointer for getting back to master superblock info */
 115         void *os_priv;
 116 };
 117
 118 #endif /* _JFFS2_FB_SB */