[0c0f128] | 1 | /* |
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| 2 | * JFFS2 -- Journalling Flash File System, Version 2. |
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| 3 | * |
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| 4 | * Copyright © 2001-2007 Red Hat, Inc. |
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| 5 | * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org> |
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| 6 | * |
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| 7 | * Created by David Woodhouse <dwmw2@infradead.org> |
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| 8 | * |
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| 9 | * For licensing information, see the file 'LICENCE' in this directory. |
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| 10 | * |
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| 11 | */ |
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| 12 | |
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| 13 | #ifndef _JFFS2_FS_SB |
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| 14 | #define _JFFS2_FS_SB |
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| 15 | |
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| 16 | #include <linux/types.h> |
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| 17 | #include <linux/spinlock.h> |
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| 18 | #include <linux/workqueue.h> |
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| 19 | #include <linux/completion.h> |
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| 20 | #include <linux/mutex.h> |
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| 21 | #include <linux/timer.h> |
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| 22 | #include <linux/wait.h> |
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| 23 | #include <linux/list.h> |
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| 24 | #include <linux/rwsem.h> |
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| 25 | |
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| 26 | #define JFFS2_SB_FLAG_RO 1 |
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| 27 | #define JFFS2_SB_FLAG_SCANNING 2 /* Flash scanning is in progress */ |
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| 28 | #define JFFS2_SB_FLAG_BUILDING 4 /* File system building is in progress */ |
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| 29 | |
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| 30 | struct jffs2_inodirty; |
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| 31 | |
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| 32 | struct jffs2_mount_opts { |
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| 33 | bool override_compr; |
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| 34 | unsigned int compr; |
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| 35 | |
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| 36 | /* The size of the reserved pool. The reserved pool is the JFFS2 flash |
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| 37 | * space which may only be used by root cannot be used by the other |
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| 38 | * users. This is implemented simply by means of not allowing the |
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| 39 | * latter users to write to the file system if the amount if the |
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| 40 | * available space is less then 'rp_size'. */ |
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| 41 | unsigned int rp_size; |
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| 42 | }; |
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| 43 | |
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| 44 | /* A struct for the overall file system control. Pointers to |
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| 45 | jffs2_sb_info structs are named `c' in the source code. |
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| 46 | Nee jffs_control |
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| 47 | */ |
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| 48 | struct jffs2_sb_info { |
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| 49 | struct mtd_info *mtd; |
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| 50 | |
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| 51 | uint32_t highest_ino; |
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| 52 | uint32_t checked_ino; |
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| 53 | |
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| 54 | unsigned int flags; |
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| 55 | |
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| 56 | struct task_struct *gc_task; /* GC task struct */ |
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| 57 | struct completion gc_thread_start; /* GC thread start completion */ |
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| 58 | struct completion gc_thread_exit; /* GC thread exit completion port */ |
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| 59 | |
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| 60 | struct mutex alloc_sem; /* Used to protect all the following |
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| 61 | fields, and also to protect against |
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| 62 | out-of-order writing of nodes. And GC. */ |
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| 63 | uint32_t cleanmarker_size; /* Size of an _inline_ CLEANMARKER |
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| 64 | (i.e. zero for OOB CLEANMARKER */ |
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| 65 | |
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| 66 | uint32_t flash_size; |
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| 67 | uint32_t used_size; |
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| 68 | uint32_t dirty_size; |
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| 69 | uint32_t wasted_size; |
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| 70 | uint32_t free_size; |
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| 71 | uint32_t erasing_size; |
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| 72 | uint32_t bad_size; |
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| 73 | uint32_t sector_size; |
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| 74 | uint32_t unchecked_size; |
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| 75 | |
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| 76 | uint32_t nr_free_blocks; |
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| 77 | uint32_t nr_erasing_blocks; |
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| 78 | |
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| 79 | /* Number of free blocks there must be before we... */ |
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| 80 | uint8_t resv_blocks_write; /* ... allow a normal filesystem write */ |
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| 81 | uint8_t resv_blocks_deletion; /* ... allow a normal filesystem deletion */ |
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| 82 | uint8_t resv_blocks_gctrigger; /* ... wake up the GC thread */ |
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| 83 | uint8_t resv_blocks_gcbad; /* ... pick a block from the bad_list to GC */ |
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| 84 | uint8_t resv_blocks_gcmerge; /* ... merge pages when garbage collecting */ |
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| 85 | /* Number of 'very dirty' blocks before we trigger immediate GC */ |
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| 86 | uint8_t vdirty_blocks_gctrigger; |
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| 87 | |
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| 88 | uint32_t nospc_dirty_size; |
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| 89 | |
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| 90 | uint32_t nr_blocks; |
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| 91 | struct jffs2_eraseblock *blocks; /* The whole array of blocks. Used for getting blocks |
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| 92 | * from the offset (blocks[ofs / sector_size]) */ |
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| 93 | struct jffs2_eraseblock *nextblock; /* The block we're currently filling */ |
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| 94 | |
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| 95 | struct jffs2_eraseblock *gcblock; /* The block we're currently garbage-collecting */ |
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| 96 | |
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| 97 | struct list_head clean_list; /* Blocks 100% full of clean data */ |
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| 98 | struct list_head very_dirty_list; /* Blocks with lots of dirty space */ |
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| 99 | struct list_head dirty_list; /* Blocks with some dirty space */ |
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| 100 | struct list_head erasable_list; /* Blocks which are completely dirty, and need erasing */ |
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| 101 | struct list_head erasable_pending_wbuf_list; /* Blocks which need erasing but only after the current wbuf is flushed */ |
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| 102 | struct list_head erasing_list; /* Blocks which are currently erasing */ |
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| 103 | struct list_head erase_checking_list; /* Blocks which are being checked and marked */ |
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| 104 | struct list_head erase_pending_list; /* Blocks which need erasing now */ |
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| 105 | struct list_head erase_complete_list; /* Blocks which are erased and need the clean marker written to them */ |
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| 106 | struct list_head free_list; /* Blocks which are free and ready to be used */ |
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| 107 | struct list_head bad_list; /* Bad blocks. */ |
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| 108 | struct list_head bad_used_list; /* Bad blocks with valid data in. */ |
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| 109 | |
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| 110 | spinlock_t erase_completion_lock; /* Protect free_list and erasing_list |
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| 111 | against erase completion handler */ |
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| 112 | wait_queue_head_t erase_wait; /* For waiting for erases to complete */ |
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| 113 | |
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| 114 | wait_queue_head_t inocache_wq; |
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| 115 | int inocache_hashsize; |
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| 116 | struct jffs2_inode_cache **inocache_list; |
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| 117 | spinlock_t inocache_lock; |
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| 118 | |
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| 119 | /* Sem to allow jffs2_garbage_collect_deletion_dirent to |
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| 120 | drop the erase_completion_lock while it's holding a pointer |
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| 121 | to an obsoleted node. I don't like this. Alternatives welcomed. */ |
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| 122 | struct mutex erase_free_sem; |
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| 123 | |
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| 124 | uint32_t wbuf_pagesize; /* 0 for NOR and other flashes with no wbuf */ |
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| 125 | |
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| 126 | #ifdef CONFIG_JFFS2_FS_WBUF_VERIFY |
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| 127 | unsigned char *wbuf_verify; /* read-back buffer for verification */ |
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| 128 | #endif |
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| 129 | #ifdef CONFIG_JFFS2_FS_WRITEBUFFER |
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| 130 | unsigned char *wbuf; /* Write-behind buffer for NAND flash */ |
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| 131 | uint32_t wbuf_ofs; |
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| 132 | uint32_t wbuf_len; |
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| 133 | struct jffs2_inodirty *wbuf_inodes; |
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| 134 | struct rw_semaphore wbuf_sem; /* Protects the write buffer */ |
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| 135 | |
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| 136 | struct delayed_work wbuf_dwork; /* write-buffer write-out work */ |
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| 137 | |
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| 138 | unsigned char *oobbuf; |
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| 139 | int oobavail; /* How many bytes are available for JFFS2 in OOB */ |
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| 140 | #endif |
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| 141 | |
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| 142 | struct jffs2_summary *summary; /* Summary information */ |
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| 143 | struct jffs2_mount_opts mount_opts; |
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| 144 | |
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| 145 | #ifdef CONFIG_JFFS2_FS_XATTR |
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| 146 | #define XATTRINDEX_HASHSIZE (57) |
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| 147 | uint32_t highest_xid; |
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| 148 | uint32_t highest_xseqno; |
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| 149 | struct list_head xattrindex[XATTRINDEX_HASHSIZE]; |
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| 150 | struct list_head xattr_unchecked; |
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| 151 | struct list_head xattr_dead_list; |
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| 152 | struct jffs2_xattr_ref *xref_dead_list; |
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| 153 | struct jffs2_xattr_ref *xref_temp; |
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| 154 | struct rw_semaphore xattr_sem; |
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| 155 | uint32_t xdatum_mem_usage; |
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| 156 | uint32_t xdatum_mem_threshold; |
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| 157 | #endif |
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| 158 | /* OS-private pointer for getting back to master superblock info */ |
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| 159 | void *os_priv; |
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| 160 | }; |
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| 161 | |
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| 162 | #endif /* _JFFS2_FS_SB */ |
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