David Woodhouse | c00c310 | 2007-04-25 14:16:47 +0100 | [diff] [blame] | 1 | /* |
| 2 | * JFFS2 -- Journalling Flash File System, Version 2. |
| 3 | * |
| 4 | * Copyright © 2001-2007 Red Hat, Inc. |
| 5 | * |
| 6 | * Created by David Woodhouse <dwmw2@infradead.org> |
| 7 | * |
| 8 | * For licensing information, see the file 'LICENCE' in this directory. |
| 9 | * |
| 10 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | |
| 12 | #ifndef _JFFS2_FS_SB |
| 13 | #define _JFFS2_FS_SB |
| 14 | |
| 15 | #include <linux/types.h> |
| 16 | #include <linux/spinlock.h> |
| 17 | #include <linux/workqueue.h> |
| 18 | #include <linux/completion.h> |
| 19 | #include <asm/semaphore.h> |
| 20 | #include <linux/timer.h> |
| 21 | #include <linux/wait.h> |
| 22 | #include <linux/list.h> |
| 23 | #include <linux/rwsem.h> |
| 24 | |
| 25 | #define JFFS2_SB_FLAG_RO 1 |
Artem B. Bityuckiy | 31fbdf7 | 2005-02-28 08:21:09 +0000 | [diff] [blame] | 26 | #define JFFS2_SB_FLAG_SCANNING 2 /* Flash scanning is in progress */ |
| 27 | #define JFFS2_SB_FLAG_BUILDING 4 /* File system building is in progress */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | |
| 29 | struct jffs2_inodirty; |
| 30 | |
| 31 | /* A struct for the overall file system control. Pointers to |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 32 | jffs2_sb_info structs are named `c' in the source code. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | Nee jffs_control |
| 34 | */ |
| 35 | struct jffs2_sb_info { |
| 36 | struct mtd_info *mtd; |
| 37 | |
| 38 | uint32_t highest_ino; |
| 39 | uint32_t checked_ino; |
| 40 | |
| 41 | unsigned int flags; |
| 42 | |
| 43 | struct task_struct *gc_task; /* GC task struct */ |
Thomas Gleixner | fff7afd | 2005-05-19 17:18:11 +0100 | [diff] [blame] | 44 | struct completion gc_thread_start; /* GC thread start completion */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | struct completion gc_thread_exit; /* GC thread exit completion port */ |
| 46 | |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 47 | struct semaphore alloc_sem; /* Used to protect all the following |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | fields, and also to protect against |
| 49 | out-of-order writing of nodes. And GC. */ |
| 50 | uint32_t cleanmarker_size; /* Size of an _inline_ CLEANMARKER |
| 51 | (i.e. zero for OOB CLEANMARKER */ |
| 52 | |
| 53 | uint32_t flash_size; |
| 54 | uint32_t used_size; |
| 55 | uint32_t dirty_size; |
| 56 | uint32_t wasted_size; |
| 57 | uint32_t free_size; |
| 58 | uint32_t erasing_size; |
| 59 | uint32_t bad_size; |
| 60 | uint32_t sector_size; |
| 61 | uint32_t unchecked_size; |
| 62 | |
| 63 | uint32_t nr_free_blocks; |
| 64 | uint32_t nr_erasing_blocks; |
| 65 | |
| 66 | /* Number of free blocks there must be before we... */ |
| 67 | uint8_t resv_blocks_write; /* ... allow a normal filesystem write */ |
| 68 | uint8_t resv_blocks_deletion; /* ... allow a normal filesystem deletion */ |
| 69 | uint8_t resv_blocks_gctrigger; /* ... wake up the GC thread */ |
| 70 | uint8_t resv_blocks_gcbad; /* ... pick a block from the bad_list to GC */ |
| 71 | uint8_t resv_blocks_gcmerge; /* ... merge pages when garbage collecting */ |
| 72 | |
| 73 | uint32_t nospc_dirty_size; |
| 74 | |
| 75 | uint32_t nr_blocks; |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 76 | struct jffs2_eraseblock *blocks; /* The whole array of blocks. Used for getting blocks |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | * from the offset (blocks[ofs / sector_size]) */ |
| 78 | struct jffs2_eraseblock *nextblock; /* The block we're currently filling */ |
| 79 | |
| 80 | struct jffs2_eraseblock *gcblock; /* The block we're currently garbage-collecting */ |
| 81 | |
| 82 | struct list_head clean_list; /* Blocks 100% full of clean data */ |
| 83 | struct list_head very_dirty_list; /* Blocks with lots of dirty space */ |
| 84 | struct list_head dirty_list; /* Blocks with some dirty space */ |
| 85 | struct list_head erasable_list; /* Blocks which are completely dirty, and need erasing */ |
| 86 | struct list_head erasable_pending_wbuf_list; /* Blocks which need erasing but only after the current wbuf is flushed */ |
| 87 | struct list_head erasing_list; /* Blocks which are currently erasing */ |
| 88 | struct list_head erase_pending_list; /* Blocks which need erasing now */ |
| 89 | struct list_head erase_complete_list; /* Blocks which are erased and need the clean marker written to them */ |
| 90 | struct list_head free_list; /* Blocks which are free and ready to be used */ |
| 91 | struct list_head bad_list; /* Bad blocks. */ |
| 92 | struct list_head bad_used_list; /* Bad blocks with valid data in. */ |
| 93 | |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 94 | spinlock_t erase_completion_lock; /* Protect free_list and erasing_list |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | against erase completion handler */ |
| 96 | wait_queue_head_t erase_wait; /* For waiting for erases to complete */ |
| 97 | |
| 98 | wait_queue_head_t inocache_wq; |
| 99 | struct jffs2_inode_cache **inocache_list; |
| 100 | spinlock_t inocache_lock; |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 101 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | /* Sem to allow jffs2_garbage_collect_deletion_dirent to |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 103 | drop the erase_completion_lock while it's holding a pointer |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | to an obsoleted node. I don't like this. Alternatives welcomed. */ |
| 105 | struct semaphore erase_free_sem; |
| 106 | |
Artem B. Bityutskiy | 733802d | 2005-09-22 12:25:00 +0100 | [diff] [blame] | 107 | uint32_t wbuf_pagesize; /* 0 for NOR and other flashes with no wbuf */ |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 108 | |
Andrew Victor | 2f82ce1 | 2005-02-09 09:24:26 +0000 | [diff] [blame] | 109 | #ifdef CONFIG_JFFS2_FS_WRITEBUFFER |
Artem Bityutskiy | a7a6ace1 | 2007-01-31 11:38:53 +0200 | [diff] [blame] | 110 | unsigned char *wbuf; /* Write-behind buffer for NAND flash */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | uint32_t wbuf_ofs; |
| 112 | uint32_t wbuf_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | struct jffs2_inodirty *wbuf_inodes; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | struct rw_semaphore wbuf_sem; /* Protects the write buffer */ |
| 115 | |
Artem Bityutskiy | a7a6ace1 | 2007-01-31 11:38:53 +0200 | [diff] [blame] | 116 | unsigned char *oobbuf; |
| 117 | int oobavail; /* How many bytes are available for JFFS2 in OOB */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | #endif |
| 119 | |
Ferenc Havasi | e631ddb | 2005-09-07 09:35:26 +0100 | [diff] [blame] | 120 | struct jffs2_summary *summary; /* Summary information */ |
| 121 | |
KaiGai Kohei | aa98d7c | 2006-05-13 15:09:47 +0900 | [diff] [blame] | 122 | #ifdef CONFIG_JFFS2_FS_XATTR |
| 123 | #define XATTRINDEX_HASHSIZE (57) |
| 124 | uint32_t highest_xid; |
KaiGai Kohei | c9f700f | 2006-06-11 10:35:15 +0900 | [diff] [blame] | 125 | uint32_t highest_xseqno; |
KaiGai Kohei | aa98d7c | 2006-05-13 15:09:47 +0900 | [diff] [blame] | 126 | struct list_head xattrindex[XATTRINDEX_HASHSIZE]; |
KaiGai Kohei | aa98d7c | 2006-05-13 15:09:47 +0900 | [diff] [blame] | 127 | struct list_head xattr_unchecked; |
KaiGai Kohei | c9f700f | 2006-06-11 10:35:15 +0900 | [diff] [blame] | 128 | struct list_head xattr_dead_list; |
| 129 | struct jffs2_xattr_ref *xref_dead_list; |
KaiGai Kohei | 8f2b6f4 | 2006-05-13 15:15:07 +0900 | [diff] [blame] | 130 | struct jffs2_xattr_ref *xref_temp; |
KaiGai Kohei | aa98d7c | 2006-05-13 15:09:47 +0900 | [diff] [blame] | 131 | struct rw_semaphore xattr_sem; |
| 132 | uint32_t xdatum_mem_usage; |
| 133 | uint32_t xdatum_mem_threshold; |
| 134 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | /* OS-private pointer for getting back to master superblock info */ |
| 136 | void *os_priv; |
| 137 | }; |
| 138 | |
| 139 | #endif /* _JFFS2_FB_SB */ |