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 unsigned char *oobbuf; 104 uint32_t wbuf_ofs; 105 uint32_t wbuf_len; 106 struct jffs2_inodirty *wbuf_inodes; 107 108 struct rw_semaphore wbuf_sem; /* Protects the write buffer */ 109 110 /* Information about out-of-band area usage... */ 111 struct nand_ecclayout *ecclayout; 112 uint32_t badblock_pos; 113 uint32_t fsdata_pos; 114 uint32_t fsdata_len; 115 #endif 116 117 struct jffs2_summary *summary; /* Summary information */ 118 119 #ifdef CONFIG_JFFS2_FS_XATTR 120 #define XATTRINDEX_HASHSIZE (57) 121 uint32_t highest_xid; 122 struct list_head xattrindex[XATTRINDEX_HASHSIZE]; 123 struct list_head xattr_unchecked; 124 struct jffs2_xattr_ref *xref_temp; 125 struct rw_semaphore xattr_sem; 126 uint32_t xdatum_mem_usage; 127 uint32_t xdatum_mem_threshold; 128 #endif 129 /* OS-private pointer for getting back to master superblock info */ 130 void *os_priv; 131 }; 132 133 #endif /* _JFFS2_FB_SB */ 134