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733802d9 | 1 | /* $Id: jffs2_fs_sb.h,v 1.54 2005/09/21 13:37:34 dedekind Exp $ */ |
1da177e4 LT |
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 | |
31fbdf7a AB |
17 | #define JFFS2_SB_FLAG_SCANNING 2 /* Flash scanning is in progress */ |
18 | #define JFFS2_SB_FLAG_BUILDING 4 /* File system building is in progress */ | |
1da177e4 LT |
19 | |
20 | struct jffs2_inodirty; | |
21 | ||
22 | /* A struct for the overall file system control. Pointers to | |
182ec4ee | 23 | jffs2_sb_info structs are named `c' in the source code. |
1da177e4 LT |
24 | Nee jffs_control |
25 | */ | |
26 | struct jffs2_sb_info { | |
27 | struct mtd_info *mtd; | |
28 | ||
29 | uint32_t highest_ino; | |
30 | uint32_t checked_ino; | |
31 | ||
32 | unsigned int flags; | |
33 | ||
34 | struct task_struct *gc_task; /* GC task struct */ | |
fff7afd7 | 35 | struct completion gc_thread_start; /* GC thread start completion */ |
1da177e4 LT |
36 | struct completion gc_thread_exit; /* GC thread exit completion port */ |
37 | ||
182ec4ee | 38 | struct semaphore alloc_sem; /* Used to protect all the following |
1da177e4 LT |
39 | fields, and also to protect against |
40 | out-of-order writing of nodes. And GC. */ | |
41 | uint32_t cleanmarker_size; /* Size of an _inline_ CLEANMARKER | |
42 | (i.e. zero for OOB CLEANMARKER */ | |
43 | ||
44 | uint32_t flash_size; | |
45 | uint32_t used_size; | |
46 | uint32_t dirty_size; | |
47 | uint32_t wasted_size; | |
48 | uint32_t free_size; | |
49 | uint32_t erasing_size; | |
50 | uint32_t bad_size; | |
51 | uint32_t sector_size; | |
52 | uint32_t unchecked_size; | |
53 | ||
54 | uint32_t nr_free_blocks; | |
55 | uint32_t nr_erasing_blocks; | |
56 | ||
57 | /* Number of free blocks there must be before we... */ | |
58 | uint8_t resv_blocks_write; /* ... allow a normal filesystem write */ | |
59 | uint8_t resv_blocks_deletion; /* ... allow a normal filesystem deletion */ | |
60 | uint8_t resv_blocks_gctrigger; /* ... wake up the GC thread */ | |
61 | uint8_t resv_blocks_gcbad; /* ... pick a block from the bad_list to GC */ | |
62 | uint8_t resv_blocks_gcmerge; /* ... merge pages when garbage collecting */ | |
63 | ||
64 | uint32_t nospc_dirty_size; | |
65 | ||
66 | uint32_t nr_blocks; | |
182ec4ee | 67 | struct jffs2_eraseblock *blocks; /* The whole array of blocks. Used for getting blocks |
1da177e4 LT |
68 | * from the offset (blocks[ofs / sector_size]) */ |
69 | struct jffs2_eraseblock *nextblock; /* The block we're currently filling */ | |
70 | ||
71 | struct jffs2_eraseblock *gcblock; /* The block we're currently garbage-collecting */ | |
72 | ||
73 | struct list_head clean_list; /* Blocks 100% full of clean data */ | |
74 | struct list_head very_dirty_list; /* Blocks with lots of dirty space */ | |
75 | struct list_head dirty_list; /* Blocks with some dirty space */ | |
76 | struct list_head erasable_list; /* Blocks which are completely dirty, and need erasing */ | |
77 | struct list_head erasable_pending_wbuf_list; /* Blocks which need erasing but only after the current wbuf is flushed */ | |
78 | struct list_head erasing_list; /* Blocks which are currently erasing */ | |
79 | struct list_head erase_pending_list; /* Blocks which need erasing now */ | |
80 | struct list_head erase_complete_list; /* Blocks which are erased and need the clean marker written to them */ | |
81 | struct list_head free_list; /* Blocks which are free and ready to be used */ | |
82 | struct list_head bad_list; /* Bad blocks. */ | |
83 | struct list_head bad_used_list; /* Bad blocks with valid data in. */ | |
84 | ||
182ec4ee | 85 | spinlock_t erase_completion_lock; /* Protect free_list and erasing_list |
1da177e4 LT |
86 | against erase completion handler */ |
87 | wait_queue_head_t erase_wait; /* For waiting for erases to complete */ | |
88 | ||
89 | wait_queue_head_t inocache_wq; | |
90 | struct jffs2_inode_cache **inocache_list; | |
91 | spinlock_t inocache_lock; | |
182ec4ee | 92 | |
1da177e4 | 93 | /* Sem to allow jffs2_garbage_collect_deletion_dirent to |
182ec4ee | 94 | drop the erase_completion_lock while it's holding a pointer |
1da177e4 LT |
95 | to an obsoleted node. I don't like this. Alternatives welcomed. */ |
96 | struct semaphore erase_free_sem; | |
97 | ||
733802d9 | 98 | uint32_t wbuf_pagesize; /* 0 for NOR and other flashes with no wbuf */ |
182ec4ee | 99 | |
2f82ce1e | 100 | #ifdef CONFIG_JFFS2_FS_WRITEBUFFER |
1da177e4 LT |
101 | /* Write-behind buffer for NAND flash */ |
102 | unsigned char *wbuf; | |
103 | uint32_t wbuf_ofs; | |
104 | uint32_t wbuf_len; | |
1da177e4 LT |
105 | struct jffs2_inodirty *wbuf_inodes; |
106 | ||
107 | struct rw_semaphore wbuf_sem; /* Protects the write buffer */ | |
108 | ||
109 | /* Information about out-of-band area usage... */ | |
110 | struct nand_oobinfo *oobinfo; | |
111 | uint32_t badblock_pos; | |
112 | uint32_t fsdata_pos; | |
113 | uint32_t fsdata_len; | |
114 | #endif | |
115 | ||
e631ddba FH |
116 | struct jffs2_summary *summary; /* Summary information */ |
117 | ||
1da177e4 LT |
118 | /* OS-private pointer for getting back to master superblock info */ |
119 | void *os_priv; | |
120 | }; | |
121 | ||
122 | #endif /* _JFFS2_FB_SB */ |