1c00c310eSDavid Woodhouse /* 2c00c310eSDavid Woodhouse * JFFS2 -- Journalling Flash File System, Version 2. 3c00c310eSDavid Woodhouse * 4c00c310eSDavid Woodhouse * Copyright © 2001-2007 Red Hat, Inc. 5c00c310eSDavid Woodhouse * 6c00c310eSDavid Woodhouse * Created by David Woodhouse <dwmw2@infradead.org> 7c00c310eSDavid Woodhouse * 8c00c310eSDavid Woodhouse * For licensing information, see the file 'LICENCE' in this directory. 9c00c310eSDavid Woodhouse * 10c00c310eSDavid Woodhouse */ 11cbb9a561SDavid Woodhouse 12cbb9a561SDavid Woodhouse #ifndef _JFFS2_FS_SB 13cbb9a561SDavid Woodhouse #define _JFFS2_FS_SB 14cbb9a561SDavid Woodhouse 15cbb9a561SDavid Woodhouse #include <linux/types.h> 16cbb9a561SDavid Woodhouse #include <linux/spinlock.h> 17cbb9a561SDavid Woodhouse #include <linux/workqueue.h> 18cbb9a561SDavid Woodhouse #include <linux/completion.h> 19cbb9a561SDavid Woodhouse #include <asm/semaphore.h> 20cbb9a561SDavid Woodhouse #include <linux/timer.h> 21cbb9a561SDavid Woodhouse #include <linux/wait.h> 22cbb9a561SDavid Woodhouse #include <linux/list.h> 23cbb9a561SDavid Woodhouse #include <linux/rwsem.h> 24cbb9a561SDavid Woodhouse 25cbb9a561SDavid Woodhouse #define JFFS2_SB_FLAG_RO 1 26cbb9a561SDavid Woodhouse #define JFFS2_SB_FLAG_SCANNING 2 /* Flash scanning is in progress */ 27cbb9a561SDavid Woodhouse #define JFFS2_SB_FLAG_BUILDING 4 /* File system building is in progress */ 28cbb9a561SDavid Woodhouse 29cbb9a561SDavid Woodhouse struct jffs2_inodirty; 30cbb9a561SDavid Woodhouse 31cbb9a561SDavid Woodhouse /* A struct for the overall file system control. Pointers to 32cbb9a561SDavid Woodhouse jffs2_sb_info structs are named `c' in the source code. 33cbb9a561SDavid Woodhouse Nee jffs_control 34cbb9a561SDavid Woodhouse */ 35cbb9a561SDavid Woodhouse struct jffs2_sb_info { 36cbb9a561SDavid Woodhouse struct mtd_info *mtd; 37cbb9a561SDavid Woodhouse 38cbb9a561SDavid Woodhouse uint32_t highest_ino; 39cbb9a561SDavid Woodhouse uint32_t checked_ino; 40cbb9a561SDavid Woodhouse 41cbb9a561SDavid Woodhouse unsigned int flags; 42cbb9a561SDavid Woodhouse 43cbb9a561SDavid Woodhouse struct task_struct *gc_task; /* GC task struct */ 44cbb9a561SDavid Woodhouse struct completion gc_thread_start; /* GC thread start completion */ 45cbb9a561SDavid Woodhouse struct completion gc_thread_exit; /* GC thread exit completion port */ 46cbb9a561SDavid Woodhouse 47cbb9a561SDavid Woodhouse struct semaphore alloc_sem; /* Used to protect all the following 48cbb9a561SDavid Woodhouse fields, and also to protect against 49cbb9a561SDavid Woodhouse out-of-order writing of nodes. And GC. */ 50cbb9a561SDavid Woodhouse uint32_t cleanmarker_size; /* Size of an _inline_ CLEANMARKER 51cbb9a561SDavid Woodhouse (i.e. zero for OOB CLEANMARKER */ 52cbb9a561SDavid Woodhouse 53cbb9a561SDavid Woodhouse uint32_t flash_size; 54cbb9a561SDavid Woodhouse uint32_t used_size; 55cbb9a561SDavid Woodhouse uint32_t dirty_size; 56cbb9a561SDavid Woodhouse uint32_t wasted_size; 57cbb9a561SDavid Woodhouse uint32_t free_size; 58cbb9a561SDavid Woodhouse uint32_t erasing_size; 59cbb9a561SDavid Woodhouse uint32_t bad_size; 60cbb9a561SDavid Woodhouse uint32_t sector_size; 61cbb9a561SDavid Woodhouse uint32_t unchecked_size; 62cbb9a561SDavid Woodhouse 63cbb9a561SDavid Woodhouse uint32_t nr_free_blocks; 64cbb9a561SDavid Woodhouse uint32_t nr_erasing_blocks; 65cbb9a561SDavid Woodhouse 66cbb9a561SDavid Woodhouse /* Number of free blocks there must be before we... */ 67cbb9a561SDavid Woodhouse uint8_t resv_blocks_write; /* ... allow a normal filesystem write */ 68cbb9a561SDavid Woodhouse uint8_t resv_blocks_deletion; /* ... allow a normal filesystem deletion */ 69cbb9a561SDavid Woodhouse uint8_t resv_blocks_gctrigger; /* ... wake up the GC thread */ 70cbb9a561SDavid Woodhouse uint8_t resv_blocks_gcbad; /* ... pick a block from the bad_list to GC */ 71cbb9a561SDavid Woodhouse uint8_t resv_blocks_gcmerge; /* ... merge pages when garbage collecting */ 72cbb9a561SDavid Woodhouse 73cbb9a561SDavid Woodhouse uint32_t nospc_dirty_size; 74cbb9a561SDavid Woodhouse 75cbb9a561SDavid Woodhouse uint32_t nr_blocks; 76cbb9a561SDavid Woodhouse struct jffs2_eraseblock *blocks; /* The whole array of blocks. Used for getting blocks 77cbb9a561SDavid Woodhouse * from the offset (blocks[ofs / sector_size]) */ 78cbb9a561SDavid Woodhouse struct jffs2_eraseblock *nextblock; /* The block we're currently filling */ 79cbb9a561SDavid Woodhouse 80cbb9a561SDavid Woodhouse struct jffs2_eraseblock *gcblock; /* The block we're currently garbage-collecting */ 81cbb9a561SDavid Woodhouse 82cbb9a561SDavid Woodhouse struct list_head clean_list; /* Blocks 100% full of clean data */ 83cbb9a561SDavid Woodhouse struct list_head very_dirty_list; /* Blocks with lots of dirty space */ 84cbb9a561SDavid Woodhouse struct list_head dirty_list; /* Blocks with some dirty space */ 85cbb9a561SDavid Woodhouse struct list_head erasable_list; /* Blocks which are completely dirty, and need erasing */ 86cbb9a561SDavid Woodhouse struct list_head erasable_pending_wbuf_list; /* Blocks which need erasing but only after the current wbuf is flushed */ 87cbb9a561SDavid Woodhouse struct list_head erasing_list; /* Blocks which are currently erasing */ 88cbb9a561SDavid Woodhouse struct list_head erase_pending_list; /* Blocks which need erasing now */ 89cbb9a561SDavid Woodhouse struct list_head erase_complete_list; /* Blocks which are erased and need the clean marker written to them */ 90cbb9a561SDavid Woodhouse struct list_head free_list; /* Blocks which are free and ready to be used */ 91cbb9a561SDavid Woodhouse struct list_head bad_list; /* Bad blocks. */ 92cbb9a561SDavid Woodhouse struct list_head bad_used_list; /* Bad blocks with valid data in. */ 93cbb9a561SDavid Woodhouse 94cbb9a561SDavid Woodhouse spinlock_t erase_completion_lock; /* Protect free_list and erasing_list 95cbb9a561SDavid Woodhouse against erase completion handler */ 96cbb9a561SDavid Woodhouse wait_queue_head_t erase_wait; /* For waiting for erases to complete */ 97cbb9a561SDavid Woodhouse 98cbb9a561SDavid Woodhouse wait_queue_head_t inocache_wq; 99cbb9a561SDavid Woodhouse struct jffs2_inode_cache **inocache_list; 100cbb9a561SDavid Woodhouse spinlock_t inocache_lock; 101cbb9a561SDavid Woodhouse 102cbb9a561SDavid Woodhouse /* Sem to allow jffs2_garbage_collect_deletion_dirent to 103cbb9a561SDavid Woodhouse drop the erase_completion_lock while it's holding a pointer 104cbb9a561SDavid Woodhouse to an obsoleted node. I don't like this. Alternatives welcomed. */ 105cbb9a561SDavid Woodhouse struct semaphore erase_free_sem; 106cbb9a561SDavid Woodhouse 107cbb9a561SDavid Woodhouse uint32_t wbuf_pagesize; /* 0 for NOR and other flashes with no wbuf */ 108cbb9a561SDavid Woodhouse 109a6bc432eSDavid Woodhouse #ifdef CONFIG_JFFS2_FS_WBUF_VERIFY 110a6bc432eSDavid Woodhouse unsigned char *wbuf_verify; /* read-back buffer for verification */ 111a6bc432eSDavid Woodhouse #endif 112cbb9a561SDavid Woodhouse #ifdef CONFIG_JFFS2_FS_WRITEBUFFER 113a7a6ace1SArtem Bityutskiy unsigned char *wbuf; /* Write-behind buffer for NAND flash */ 114cbb9a561SDavid Woodhouse uint32_t wbuf_ofs; 115cbb9a561SDavid Woodhouse uint32_t wbuf_len; 116cbb9a561SDavid Woodhouse struct jffs2_inodirty *wbuf_inodes; 117cbb9a561SDavid Woodhouse struct rw_semaphore wbuf_sem; /* Protects the write buffer */ 118cbb9a561SDavid Woodhouse 119a7a6ace1SArtem Bityutskiy unsigned char *oobbuf; 120a7a6ace1SArtem Bityutskiy int oobavail; /* How many bytes are available for JFFS2 in OOB */ 121cbb9a561SDavid Woodhouse #endif 122cbb9a561SDavid Woodhouse 123cbb9a561SDavid Woodhouse struct jffs2_summary *summary; /* Summary information */ 124cbb9a561SDavid Woodhouse 125aa98d7cfSKaiGai Kohei #ifdef CONFIG_JFFS2_FS_XATTR 126aa98d7cfSKaiGai Kohei #define XATTRINDEX_HASHSIZE (57) 127aa98d7cfSKaiGai Kohei uint32_t highest_xid; 128c9f700f8SKaiGai Kohei uint32_t highest_xseqno; 129aa98d7cfSKaiGai Kohei struct list_head xattrindex[XATTRINDEX_HASHSIZE]; 130aa98d7cfSKaiGai Kohei struct list_head xattr_unchecked; 131c9f700f8SKaiGai Kohei struct list_head xattr_dead_list; 132c9f700f8SKaiGai Kohei struct jffs2_xattr_ref *xref_dead_list; 1338f2b6f49SKaiGai Kohei struct jffs2_xattr_ref *xref_temp; 134aa98d7cfSKaiGai Kohei struct rw_semaphore xattr_sem; 135aa98d7cfSKaiGai Kohei uint32_t xdatum_mem_usage; 136aa98d7cfSKaiGai Kohei uint32_t xdatum_mem_threshold; 137aa98d7cfSKaiGai Kohei #endif 138cbb9a561SDavid Woodhouse /* OS-private pointer for getting back to master superblock info */ 139cbb9a561SDavid Woodhouse void *os_priv; 140cbb9a561SDavid Woodhouse }; 141cbb9a561SDavid Woodhouse 142cbb9a561SDavid Woodhouse #endif /* _JFFS2_FB_SB */ 143