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