1 /* $Id: jffs2_fs_sb.h,v 1.52 2005/05/19 16:12:17 gleixner Exp $ */ 2 3 #ifndef _JFFS2_FS_SB 4 #define _JFFS2_FS_SB 5 6 #include "jffs2_config.h" 7 #include <linux/types.h> 8 #include <linux/spinlock.h> 9 #include <linux/workqueue.h> 10 #include <linux/completion.h> 11 #include <asm/semaphore.h> 12 #include <linux/timer.h> 13 #include <linux/wait.h> 14 #include <linux/list.h> 15 #include <linux/rwsem.h> 16 17 #define JFFS2_SB_FLAG_RO 1 18 #define JFFS2_SB_FLAG_SCANNING 2 /* Flash scanning is in progress */ 19 #define JFFS2_SB_FLAG_BUILDING 4 /* File system building is in progress */ 20 21 struct jffs2_inodirty; 22 23 /* A struct for the overall file system control. Pointers to 24 jffs2_sb_info structs are named `c' in the source code. 25 Nee jffs_control 26 */ 27 struct jffs2_sb_info { 28 struct mtd_info *mtd; 29 30 uint32_t highest_ino; 31 uint32_t checked_ino; 32 33 unsigned int flags; 34 35 struct task_struct *gc_task; /* GC task struct */ 36 struct completion gc_thread_start; /* GC thread start completion */ 37 struct completion gc_thread_exit; /* GC thread exit completion port */ 38 39 struct semaphore alloc_sem; /* Used to protect all the following 40 fields, and also to protect against 41 out-of-order writing of nodes. And GC. */ 42 uint32_t cleanmarker_size; /* Size of an _inline_ CLEANMARKER 43 (i.e. zero for OOB CLEANMARKER */ 44 45 uint32_t flash_size; 46 uint32_t used_size; 47 uint32_t dirty_size; 48 uint32_t wasted_size; 49 uint32_t free_size; 50 uint32_t erasing_size; 51 uint32_t bad_size; 52 uint32_t sector_size; 53 uint32_t unchecked_size; 54 55 uint32_t nr_free_blocks; 56 uint32_t nr_erasing_blocks; 57 58 /* Number of free blocks there must be before we... */ 59 uint8_t resv_blocks_write; /* ... allow a normal filesystem write */ 60 uint8_t resv_blocks_deletion; /* ... allow a normal filesystem deletion */ 61 uint8_t resv_blocks_gctrigger; /* ... wake up the GC thread */ 62 uint8_t resv_blocks_gcbad; /* ... pick a block from the bad_list to GC */ 63 uint8_t resv_blocks_gcmerge; /* ... merge pages when garbage collecting */ 64 65 uint32_t nospc_dirty_size; 66 67 uint32_t nr_blocks; 68 struct jffs2_eraseblock *blocks; /* The whole array of blocks. Used for getting blocks 69 * from the offset (blocks[ofs / sector_size]) */ 70 struct jffs2_eraseblock *nextblock; /* The block we're currently filling */ 71 72 struct jffs2_eraseblock *gcblock; /* The block we're currently garbage-collecting */ 73 74 struct list_head clean_list; /* Blocks 100% full of clean data */ 75 struct list_head very_dirty_list; /* Blocks with lots of dirty space */ 76 struct list_head dirty_list; /* Blocks with some dirty space */ 77 struct list_head erasable_list; /* Blocks which are completely dirty, and need erasing */ 78 struct list_head erasable_pending_wbuf_list; /* Blocks which need erasing but only after the current wbuf is flushed */ 79 struct list_head erasing_list; /* Blocks which are currently erasing */ 80 struct list_head erase_pending_list; /* Blocks which need erasing now */ 81 struct list_head erase_complete_list; /* Blocks which are erased and need the clean marker written to them */ 82 struct list_head free_list; /* Blocks which are free and ready to be used */ 83 struct list_head bad_list; /* Bad blocks. */ 84 struct list_head bad_used_list; /* Bad blocks with valid data in. */ 85 86 spinlock_t erase_completion_lock; /* Protect free_list and erasing_list 87 against erase completion handler */ 88 wait_queue_head_t erase_wait; /* For waiting for erases to complete */ 89 90 wait_queue_head_t inocache_wq; 91 struct jffs2_inode_cache **inocache_list; 92 spinlock_t inocache_lock; 93 94 /* Sem to allow jffs2_garbage_collect_deletion_dirent to 95 drop the erase_completion_lock while it's holding a pointer 96 to an obsoleted node. I don't like this. Alternatives welcomed. */ 97 struct semaphore erase_free_sem; 98 99 #ifdef CONFIG_JFFS2_FS_WRITEBUFFER 100 /* Write-behind buffer for NAND flash */ 101 unsigned char *wbuf; 102 uint32_t wbuf_ofs; 103 uint32_t wbuf_len; 104 uint32_t wbuf_pagesize; 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 /* OS-private pointer for getting back to master superblock info */ 117 void *os_priv; 118 }; 119 120 #endif /* _JFFS2_FB_SB */ 121