jffs2_fs_sb.h 4.6 KB

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  1. /* $Id: jffs2_fs_sb.h,v 1.1.1.1 2007/06/12 07:27:13 eyryu Exp $ */
  2. #ifndef _JFFS2_FS_SB
  3. #define _JFFS2_FS_SB
  4. #include <linux/types.h>
  5. #include <linux/spinlock.h>
  6. #include <linux/workqueue.h>
  7. #include <linux/completion.h>
  8. #include <asm/semaphore.h>
  9. #include <linux/timer.h>
  10. #include <linux/wait.h>
  11. #include <linux/list.h>
  12. #include <linux/rwsem.h>
  13. #define JFFS2_SB_FLAG_RO 1
  14. #define JFFS2_SB_FLAG_SCANNING 2 /* Flash scanning is in progress */
  15. #define JFFS2_SB_FLAG_BUILDING 4 /* File system building is in progress */
  16. struct jffs2_inodirty;
  17. /* A struct for the overall file system control. Pointers to
  18. jffs2_sb_info structs are named `c' in the source code.
  19. Nee jffs_control
  20. */
  21. struct jffs2_sb_info {
  22. struct mtd_info *mtd;
  23. uint32_t highest_ino;
  24. uint32_t checked_ino;
  25. unsigned int flags;
  26. struct task_struct *gc_task; /* GC task struct */
  27. struct completion gc_thread_start; /* GC thread start completion */
  28. struct completion gc_thread_exit; /* GC thread exit completion port */
  29. struct semaphore alloc_sem; /* Used to protect all the following
  30. fields, and also to protect against
  31. out-of-order writing of nodes. And GC. */
  32. uint32_t cleanmarker_size; /* Size of an _inline_ CLEANMARKER
  33. (i.e. zero for OOB CLEANMARKER */
  34. uint32_t flash_size;
  35. uint32_t used_size;
  36. uint32_t dirty_size;
  37. uint32_t wasted_size;
  38. uint32_t free_size;
  39. uint32_t erasing_size;
  40. uint32_t bad_size;
  41. uint32_t sector_size;
  42. uint32_t unchecked_size;
  43. uint32_t nr_free_blocks;
  44. uint32_t nr_erasing_blocks;
  45. /* Number of free blocks there must be before we... */
  46. uint8_t resv_blocks_write; /* ... allow a normal filesystem write */
  47. uint8_t resv_blocks_deletion; /* ... allow a normal filesystem deletion */
  48. uint8_t resv_blocks_gctrigger; /* ... wake up the GC thread */
  49. uint8_t resv_blocks_gcbad; /* ... pick a block from the bad_list to GC */
  50. uint8_t resv_blocks_gcmerge; /* ... merge pages when garbage collecting */
  51. uint32_t nospc_dirty_size;
  52. uint32_t nr_blocks;
  53. struct jffs2_eraseblock *blocks; /* The whole array of blocks. Used for getting blocks
  54. * from the offset (blocks[ofs / sector_size]) */
  55. struct jffs2_eraseblock *nextblock; /* The block we're currently filling */
  56. struct jffs2_eraseblock *gcblock; /* The block we're currently garbage-collecting */
  57. struct list_head clean_list; /* Blocks 100% full of clean data */
  58. struct list_head very_dirty_list; /* Blocks with lots of dirty space */
  59. struct list_head dirty_list; /* Blocks with some dirty space */
  60. struct list_head erasable_list; /* Blocks which are completely dirty, and need erasing */
  61. struct list_head erasable_pending_wbuf_list; /* Blocks which need erasing but only after the current wbuf is flushed */
  62. struct list_head erasing_list; /* Blocks which are currently erasing */
  63. struct list_head erase_pending_list; /* Blocks which need erasing now */
  64. struct list_head erase_complete_list; /* Blocks which are erased and need the clean marker written to them */
  65. struct list_head free_list; /* Blocks which are free and ready to be used */
  66. struct list_head bad_list; /* Bad blocks. */
  67. struct list_head bad_used_list; /* Bad blocks with valid data in. */
  68. spinlock_t erase_completion_lock; /* Protect free_list and erasing_list
  69. against erase completion handler */
  70. wait_queue_head_t erase_wait; /* For waiting for erases to complete */
  71. wait_queue_head_t inocache_wq;
  72. struct jffs2_inode_cache **inocache_list;
  73. spinlock_t inocache_lock;
  74. /* Sem to allow jffs2_garbage_collect_deletion_dirent to
  75. drop the erase_completion_lock while it's holding a pointer
  76. to an obsoleted node. I don't like this. Alternatives welcomed. */
  77. struct semaphore erase_free_sem;
  78. uint32_t wbuf_pagesize; /* 0 for NOR and other flashes with no wbuf */
  79. #ifdef CONFIG_JFFS2_FS_WRITEBUFFER
  80. unsigned char *wbuf; /* Write-behind buffer for NAND flash */
  81. uint32_t wbuf_ofs;
  82. uint32_t wbuf_len;
  83. struct jffs2_inodirty *wbuf_inodes;
  84. struct rw_semaphore wbuf_sem; /* Protects the write buffer */
  85. unsigned char *oobbuf;
  86. int oobavail; /* How many bytes are available for JFFS2 in OOB */
  87. #endif
  88. struct jffs2_summary *summary; /* Summary information */
  89. #ifdef CONFIG_JFFS2_FS_XATTR
  90. #define XATTRINDEX_HASHSIZE (57)
  91. uint32_t highest_xid;
  92. uint32_t highest_xseqno;
  93. struct list_head xattrindex[XATTRINDEX_HASHSIZE];
  94. struct list_head xattr_unchecked;
  95. struct list_head xattr_dead_list;
  96. struct jffs2_xattr_ref *xref_dead_list;
  97. struct jffs2_xattr_ref *xref_temp;
  98. struct rw_semaphore xattr_sem;
  99. uint32_t xdatum_mem_usage;
  100. uint32_t xdatum_mem_threshold;
  101. #endif
  102. /* OS-private pointer for getting back to master superblock info */
  103. void *os_priv;
  104. };
  105. #endif /* _JFFS2_FB_SB */