include/linux/jffs2_fs_sb.h

   1 /* $Id: jffs2_fs_sb.h,v 1.54 2005/09/21 13:37:34 dedekind 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_SCANNING 2 /* Flash scanning is in progress */
  18 #define JFFS2_SB_FLAG_BUILDING 4 /* File system building is in progress */
  19
  20 struct jffs2_inodirty;
  21
  22 /* A struct for the overall file system control.  Pointers to
  23    jffs2_sb_info structs are named `c' in the source code.
  24    Nee jffs_control
  25 */
  26 struct jffs2_sb_info {
  27         struct mtd_info *mtd;
  28
  29         uint32_t highest_ino;
  30         uint32_t checked_ino;
  31
  32         unsigned int flags;
  33
  34         struct task_struct *gc_task;    /* GC task struct */
  35         struct completion gc_thread_start; /* GC thread start completion */
  36         struct completion gc_thread_exit; /* GC thread exit completion port */
  37
  38         struct semaphore alloc_sem;     /* Used to protect all the following
  39                                            fields, and also to protect against
  40                                            out-of-order writing of nodes. And GC. */
  41         uint32_t cleanmarker_size;      /* Size of an _inline_ CLEANMARKER
  42                                          (i.e. zero for OOB CLEANMARKER */
  43
  44         uint32_t flash_size;
  45         uint32_t used_size;
  46         uint32_t dirty_size;
  47         uint32_t wasted_size;
  48         uint32_t free_size;
  49         uint32_t erasing_size;
  50         uint32_t bad_size;
  51         uint32_t sector_size;
  52         uint32_t unchecked_size;
  53
  54         uint32_t nr_free_blocks;
  55         uint32_t nr_erasing_blocks;
  56
  57         /* Number of free blocks there must be before we... */
  58         uint8_t resv_blocks_write;      /* ... allow a normal filesystem write */
  59         uint8_t resv_blocks_deletion;   /* ... allow a normal filesystem deletion */
  60         uint8_t resv_blocks_gctrigger;  /* ... wake up the GC thread */
  61         uint8_t resv_blocks_gcbad;      /* ... pick a block from the bad_list to GC */
  62         uint8_t resv_blocks_gcmerge;    /* ... merge pages when garbage collecting */
  63
  64         uint32_t nospc_dirty_size;
  65
  66         uint32_t nr_blocks;
  67         struct jffs2_eraseblock *blocks;        /* The whole array of blocks. Used for getting blocks
  68                                                  * from the offset (blocks[ofs / sector_size]) */
  69         struct jffs2_eraseblock *nextblock;     /* The block we're currently filling */
  70
  71         struct jffs2_eraseblock *gcblock;       /* The block we're currently garbage-collecting */
  72
  73         struct list_head clean_list;            /* Blocks 100% full of clean data */
  74         struct list_head very_dirty_list;       /* Blocks with lots of dirty space */
  75         struct list_head dirty_list;            /* Blocks with some dirty space */
  76         struct list_head erasable_list;         /* Blocks which are completely dirty, and need erasing */
  77         struct list_head erasable_pending_wbuf_list;    /* Blocks which need erasing but only after the current wbuf is flushed */
  78         struct list_head erasing_list;          /* Blocks which are currently erasing */
  79         struct list_head erase_pending_list;    /* Blocks which need erasing now */
  80         struct list_head erase_complete_list;   /* Blocks which are erased and need the clean marker written to them */
  81         struct list_head free_list;             /* Blocks which are free and ready to be used */
  82         struct list_head bad_list;              /* Bad blocks. */
  83         struct list_head bad_used_list;         /* Bad blocks with valid data in. */
  84
  85         spinlock_t erase_completion_lock;       /* Protect free_list and erasing_list
  86                                                    against erase completion handler */
  87         wait_queue_head_t erase_wait;           /* For waiting for erases to complete */
  88
  89         wait_queue_head_t inocache_wq;
  90         struct jffs2_inode_cache **inocache_list;
  91         spinlock_t inocache_lock;
  92
  93         /* Sem to allow jffs2_garbage_collect_deletion_dirent to
  94            drop the erase_completion_lock while it's holding a pointer
  95            to an obsoleted node. I don't like this. Alternatives welcomed. */
  96         struct semaphore erase_free_sem;
  97
  98         uint32_t wbuf_pagesize; /* 0 for NOR and other flashes with no wbuf */
  99
 100 #ifdef CONFIG_JFFS2_FS_WRITEBUFFER
 101         /* Write-behind buffer for NAND flash */
 102         unsigned char *wbuf;
 103         uint32_t wbuf_ofs;
 104         uint32_t wbuf_len;
 105         struct jffs2_inodirty *wbuf_inodes;
 106
 107         struct rw_semaphore wbuf_sem;   /* Protects the write buffer */
 108
 109         /* Information about out-of-band area usage... */
 110         struct nand_oobinfo *oobinfo;
 111         uint32_t badblock_pos;
 112         uint32_t fsdata_pos;
 113         uint32_t fsdata_len;
 114 #endif
 115
 116         struct jffs2_summary *summary;          /* Summary information */
 117
 118         /* OS-private pointer for getting back to master superblock info */
 119         void *os_priv;
 120 };
 121
 122 #endif /* _JFFS2_FB_SB */