Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | /* $Id: jffs2_fs_sb.h,v 1.48 2004/11/20 10:41:12 dwmw2 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_MOUNTING 2 |
| 18 | |
| 19 | struct jffs2_inodirty; |
| 20 | |
| 21 | /* A struct for the overall file system control. Pointers to |
| 22 | jffs2_sb_info structs are named `c' in the source code. |
| 23 | Nee jffs_control |
| 24 | */ |
| 25 | struct jffs2_sb_info { |
| 26 | struct mtd_info *mtd; |
| 27 | |
| 28 | uint32_t highest_ino; |
| 29 | uint32_t checked_ino; |
| 30 | |
| 31 | unsigned int flags; |
| 32 | |
| 33 | struct task_struct *gc_task; /* GC task struct */ |
| 34 | struct semaphore gc_thread_start; /* GC thread start mutex */ |
| 35 | struct completion gc_thread_exit; /* GC thread exit completion port */ |
| 36 | |
| 37 | struct semaphore alloc_sem; /* Used to protect all the following |
| 38 | fields, and also to protect against |
| 39 | out-of-order writing of nodes. And GC. */ |
| 40 | uint32_t cleanmarker_size; /* Size of an _inline_ CLEANMARKER |
| 41 | (i.e. zero for OOB CLEANMARKER */ |
| 42 | |
| 43 | uint32_t flash_size; |
| 44 | uint32_t used_size; |
| 45 | uint32_t dirty_size; |
| 46 | uint32_t wasted_size; |
| 47 | uint32_t free_size; |
| 48 | uint32_t erasing_size; |
| 49 | uint32_t bad_size; |
| 50 | uint32_t sector_size; |
| 51 | uint32_t unchecked_size; |
| 52 | |
| 53 | uint32_t nr_free_blocks; |
| 54 | uint32_t nr_erasing_blocks; |
| 55 | |
| 56 | /* Number of free blocks there must be before we... */ |
| 57 | uint8_t resv_blocks_write; /* ... allow a normal filesystem write */ |
| 58 | uint8_t resv_blocks_deletion; /* ... allow a normal filesystem deletion */ |
| 59 | uint8_t resv_blocks_gctrigger; /* ... wake up the GC thread */ |
| 60 | uint8_t resv_blocks_gcbad; /* ... pick a block from the bad_list to GC */ |
| 61 | uint8_t resv_blocks_gcmerge; /* ... merge pages when garbage collecting */ |
| 62 | |
| 63 | uint32_t nospc_dirty_size; |
| 64 | |
| 65 | uint32_t nr_blocks; |
| 66 | struct jffs2_eraseblock *blocks; /* The whole array of blocks. Used for getting blocks |
| 67 | * from the offset (blocks[ofs / sector_size]) */ |
| 68 | struct jffs2_eraseblock *nextblock; /* The block we're currently filling */ |
| 69 | |
| 70 | struct jffs2_eraseblock *gcblock; /* The block we're currently garbage-collecting */ |
| 71 | |
| 72 | struct list_head clean_list; /* Blocks 100% full of clean data */ |
| 73 | struct list_head very_dirty_list; /* Blocks with lots of dirty space */ |
| 74 | struct list_head dirty_list; /* Blocks with some dirty space */ |
| 75 | struct list_head erasable_list; /* Blocks which are completely dirty, and need erasing */ |
| 76 | struct list_head erasable_pending_wbuf_list; /* Blocks which need erasing but only after the current wbuf is flushed */ |
| 77 | struct list_head erasing_list; /* Blocks which are currently erasing */ |
| 78 | struct list_head erase_pending_list; /* Blocks which need erasing now */ |
| 79 | struct list_head erase_complete_list; /* Blocks which are erased and need the clean marker written to them */ |
| 80 | struct list_head free_list; /* Blocks which are free and ready to be used */ |
| 81 | struct list_head bad_list; /* Bad blocks. */ |
| 82 | struct list_head bad_used_list; /* Bad blocks with valid data in. */ |
| 83 | |
| 84 | spinlock_t erase_completion_lock; /* Protect free_list and erasing_list |
| 85 | against erase completion handler */ |
| 86 | wait_queue_head_t erase_wait; /* For waiting for erases to complete */ |
| 87 | |
| 88 | wait_queue_head_t inocache_wq; |
| 89 | struct jffs2_inode_cache **inocache_list; |
| 90 | spinlock_t inocache_lock; |
| 91 | |
| 92 | /* Sem to allow jffs2_garbage_collect_deletion_dirent to |
| 93 | drop the erase_completion_lock while it's holding a pointer |
| 94 | to an obsoleted node. I don't like this. Alternatives welcomed. */ |
| 95 | struct semaphore erase_free_sem; |
| 96 | |
| 97 | #if defined CONFIG_JFFS2_FS_NAND || defined CONFIG_JFFS2_FS_NOR_ECC |
| 98 | /* Write-behind buffer for NAND flash */ |
| 99 | unsigned char *wbuf; |
| 100 | uint32_t wbuf_ofs; |
| 101 | uint32_t wbuf_len; |
| 102 | uint32_t wbuf_pagesize; |
| 103 | struct jffs2_inodirty *wbuf_inodes; |
| 104 | |
| 105 | struct rw_semaphore wbuf_sem; /* Protects the write buffer */ |
| 106 | |
| 107 | /* Information about out-of-band area usage... */ |
| 108 | struct nand_oobinfo *oobinfo; |
| 109 | uint32_t badblock_pos; |
| 110 | uint32_t fsdata_pos; |
| 111 | uint32_t fsdata_len; |
| 112 | #endif |
| 113 | |
| 114 | /* OS-private pointer for getting back to master superblock info */ |
| 115 | void *os_priv; |
| 116 | }; |
| 117 | |
| 118 | #endif /* _JFFS2_FB_SB */ |