jffs2_fs_sb.h 5.7 KB

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  1. /*
  2. * JFFS2 -- Journalling Flash File System, Version 2.
  3. *
  4. * Copyright © 2001-2007 Red Hat, Inc.
  5. * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org>
  6. *
  7. * Created by David Woodhouse <dwmw2@infradead.org>
  8. *
  9. * For licensing information, see the file 'LICENCE' in this directory.
  10. *
  11. */
  12. #ifndef _JFFS2_FS_SB
  13. #define _JFFS2_FS_SB
  14. #include <linux/types.h>
  15. #include <linux/spinlock.h>
  16. #include <linux/workqueue.h>
  17. #include <linux/completion.h>
  18. #include <linux/mutex.h>
  19. #include <linux/timer.h>
  20. #include <linux/wait.h>
  21. #include <linux/list.h>
  22. #include <linux/rwsem.h>
  23. #define JFFS2_SB_FLAG_RO 1
  24. #define JFFS2_SB_FLAG_SCANNING 2 /* Flash scanning is in progress */
  25. #define JFFS2_SB_FLAG_BUILDING 4 /* File system building is in progress */
  26. struct jffs2_inodirty;
  27. struct jffs2_mount_opts {
  28. bool override_compr;
  29. unsigned int compr;
  30. /* The size of the reserved pool. The reserved pool is the JFFS2 flash
  31. * space which may only be used by root cannot be used by the other
  32. * users. This is implemented simply by means of not allowing the
  33. * latter users to write to the file system if the amount if the
  34. * available space is less then 'rp_size'. */
  35. unsigned int rp_size;
  36. };
  37. /* A struct for the overall file system control. Pointers to
  38. jffs2_sb_info structs are named `c' in the source code.
  39. Nee jffs_control
  40. */
  41. struct jffs2_sb_info {
  42. struct mtd_info *mtd;
  43. uint32_t highest_ino;
  44. uint32_t check_ino; /* *NEXT* inode to be checked */
  45. unsigned int flags;
  46. struct task_struct *gc_task; /* GC task struct */
  47. struct completion gc_thread_start; /* GC thread start completion */
  48. struct completion gc_thread_exit; /* GC thread exit completion port */
  49. struct mutex alloc_sem; /* Used to protect all the following
  50. fields, and also to protect against
  51. out-of-order writing of nodes. And GC. */
  52. uint32_t cleanmarker_size; /* Size of an _inline_ CLEANMARKER
  53. (i.e. zero for OOB CLEANMARKER */
  54. uint32_t flash_size;
  55. uint32_t used_size;
  56. uint32_t dirty_size;
  57. uint32_t wasted_size;
  58. uint32_t free_size;
  59. uint32_t erasing_size;
  60. uint32_t bad_size;
  61. uint32_t sector_size;
  62. uint32_t unchecked_size;
  63. uint32_t nr_free_blocks;
  64. uint32_t nr_erasing_blocks;
  65. /* Number of free blocks there must be before we... */
  66. uint8_t resv_blocks_write; /* ... allow a normal filesystem write */
  67. uint8_t resv_blocks_deletion; /* ... allow a normal filesystem deletion */
  68. uint8_t resv_blocks_gctrigger; /* ... wake up the GC thread */
  69. uint8_t resv_blocks_gcbad; /* ... pick a block from the bad_list to GC */
  70. uint8_t resv_blocks_gcmerge; /* ... merge pages when garbage collecting */
  71. /* Number of 'very dirty' blocks before we trigger immediate GC */
  72. uint8_t vdirty_blocks_gctrigger;
  73. uint32_t nospc_dirty_size;
  74. uint32_t nr_blocks;
  75. struct jffs2_eraseblock *blocks; /* The whole array of blocks. Used for getting blocks
  76. * from the offset (blocks[ofs / sector_size]) */
  77. struct jffs2_eraseblock *nextblock; /* The block we're currently filling */
  78. struct jffs2_eraseblock *gcblock; /* The block we're currently garbage-collecting */
  79. struct list_head clean_list; /* Blocks 100% full of clean data */
  80. struct list_head very_dirty_list; /* Blocks with lots of dirty space */
  81. struct list_head dirty_list; /* Blocks with some dirty space */
  82. struct list_head erasable_list; /* Blocks which are completely dirty, and need erasing */
  83. struct list_head erasable_pending_wbuf_list; /* Blocks which need erasing but only after the current wbuf is flushed */
  84. struct list_head erasing_list; /* Blocks which are currently erasing */
  85. struct list_head erase_checking_list; /* Blocks which are being checked and marked */
  86. struct list_head erase_pending_list; /* Blocks which need erasing now */
  87. struct list_head erase_complete_list; /* Blocks which are erased and need the clean marker written to them */
  88. struct list_head free_list; /* Blocks which are free and ready to be used */
  89. struct list_head bad_list; /* Bad blocks. */
  90. struct list_head bad_used_list; /* Bad blocks with valid data in. */
  91. spinlock_t erase_completion_lock; /* Protect free_list and erasing_list
  92. against erase completion handler */
  93. wait_queue_head_t erase_wait; /* For waiting for erases to complete */
  94. wait_queue_head_t inocache_wq;
  95. int inocache_hashsize;
  96. struct jffs2_inode_cache **inocache_list;
  97. spinlock_t inocache_lock;
  98. /* Sem to allow jffs2_garbage_collect_deletion_dirent to
  99. drop the erase_completion_lock while it's holding a pointer
  100. to an obsoleted node. I don't like this. Alternatives welcomed. */
  101. struct mutex erase_free_sem;
  102. uint32_t wbuf_pagesize; /* 0 for NOR and other flashes with no wbuf */
  103. #ifdef CONFIG_JFFS2_FS_WBUF_VERIFY
  104. unsigned char *wbuf_verify; /* read-back buffer for verification */
  105. #endif
  106. #ifdef CONFIG_JFFS2_FS_WRITEBUFFER
  107. unsigned char *wbuf; /* Write-behind buffer for NAND flash */
  108. uint32_t wbuf_ofs;
  109. uint32_t wbuf_len;
  110. struct jffs2_inodirty *wbuf_inodes;
  111. struct rw_semaphore wbuf_sem; /* Protects the write buffer */
  112. struct delayed_work wbuf_dwork; /* write-buffer write-out work */
  113. unsigned char *oobbuf;
  114. int oobavail; /* How many bytes are available for JFFS2 in OOB */
  115. #endif
  116. struct jffs2_summary *summary; /* Summary information */
  117. struct jffs2_mount_opts mount_opts;
  118. #ifdef CONFIG_JFFS2_FS_XATTR
  119. #define XATTRINDEX_HASHSIZE (57)
  120. uint32_t highest_xid;
  121. uint32_t highest_xseqno;
  122. struct list_head xattrindex[XATTRINDEX_HASHSIZE];
  123. struct list_head xattr_unchecked;
  124. struct list_head xattr_dead_list;
  125. struct jffs2_xattr_ref *xref_dead_list;
  126. struct jffs2_xattr_ref *xref_temp;
  127. struct rw_semaphore xattr_sem;
  128. uint32_t xdatum_mem_usage;
  129. uint32_t xdatum_mem_threshold;
  130. #endif
  131. /* OS-private pointer for getting back to master superblock info */
  132. void *os_priv;
  133. };
  134. #endif /* _JFFS2_FS_SB */