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8f15fd55 | 1 | /* $Id: jffs2_fs_sb.h,v 1.49 2005/02/09 09:17:41 pavlov 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 | |
17 | #define JFFS2_SB_FLAG_MOUNTING 2 | |
18 | ||
19 | struct jffs2_inodirty; | |
20 | ||
21 | /* A struct for the overall file system control. Pointers to | |
22 | jffs2_sb_info structs are named `c' in the source code. | |
23 | Nee jffs_control | |
24 | */ | |
25 | struct jffs2_sb_info { | |
26 | struct mtd_info *mtd; | |
27 | ||
28 | uint32_t highest_ino; | |
29 | uint32_t checked_ino; | |
30 | ||
31 | unsigned int flags; | |
32 | ||
33 | struct task_struct *gc_task; /* GC task struct */ | |
34 | struct semaphore gc_thread_start; /* GC thread start mutex */ | |
35 | struct completion gc_thread_exit; /* GC thread exit completion port */ | |
36 | ||
37 | struct semaphore alloc_sem; /* Used to protect all the following | |
38 | fields, and also to protect against | |
39 | out-of-order writing of nodes. And GC. */ | |
40 | uint32_t cleanmarker_size; /* Size of an _inline_ CLEANMARKER | |
41 | (i.e. zero for OOB CLEANMARKER */ | |
42 | ||
43 | uint32_t flash_size; | |
44 | uint32_t used_size; | |
45 | uint32_t dirty_size; | |
46 | uint32_t wasted_size; | |
47 | uint32_t free_size; | |
48 | uint32_t erasing_size; | |
49 | uint32_t bad_size; | |
50 | uint32_t sector_size; | |
51 | uint32_t unchecked_size; | |
52 | ||
53 | uint32_t nr_free_blocks; | |
54 | uint32_t nr_erasing_blocks; | |
55 | ||
56 | /* Number of free blocks there must be before we... */ | |
57 | uint8_t resv_blocks_write; /* ... allow a normal filesystem write */ | |
58 | uint8_t resv_blocks_deletion; /* ... allow a normal filesystem deletion */ | |
59 | uint8_t resv_blocks_gctrigger; /* ... wake up the GC thread */ | |
60 | uint8_t resv_blocks_gcbad; /* ... pick a block from the bad_list to GC */ | |
61 | uint8_t resv_blocks_gcmerge; /* ... merge pages when garbage collecting */ | |
62 | ||
63 | uint32_t nospc_dirty_size; | |
64 | ||
65 | uint32_t nr_blocks; | |
66 | struct jffs2_eraseblock *blocks; /* The whole array of blocks. Used for getting blocks | |
67 | * from the offset (blocks[ofs / sector_size]) */ | |
68 | struct jffs2_eraseblock *nextblock; /* The block we're currently filling */ | |
69 | ||
70 | struct jffs2_eraseblock *gcblock; /* The block we're currently garbage-collecting */ | |
71 | ||
72 | struct list_head clean_list; /* Blocks 100% full of clean data */ | |
73 | struct list_head very_dirty_list; /* Blocks with lots of dirty space */ | |
74 | struct list_head dirty_list; /* Blocks with some dirty space */ | |
75 | struct list_head erasable_list; /* Blocks which are completely dirty, and need erasing */ | |
76 | struct list_head erasable_pending_wbuf_list; /* Blocks which need erasing but only after the current wbuf is flushed */ | |
77 | struct list_head erasing_list; /* Blocks which are currently erasing */ | |
78 | struct list_head erase_pending_list; /* Blocks which need erasing now */ | |
79 | struct list_head erase_complete_list; /* Blocks which are erased and need the clean marker written to them */ | |
80 | struct list_head free_list; /* Blocks which are free and ready to be used */ | |
81 | struct list_head bad_list; /* Bad blocks. */ | |
82 | struct list_head bad_used_list; /* Bad blocks with valid data in. */ | |
83 | ||
84 | spinlock_t erase_completion_lock; /* Protect free_list and erasing_list | |
85 | against erase completion handler */ | |
86 | wait_queue_head_t erase_wait; /* For waiting for erases to complete */ | |
87 | ||
88 | wait_queue_head_t inocache_wq; | |
89 | struct jffs2_inode_cache **inocache_list; | |
90 | spinlock_t inocache_lock; | |
91 | ||
92 | /* Sem to allow jffs2_garbage_collect_deletion_dirent to | |
93 | drop the erase_completion_lock while it's holding a pointer | |
94 | to an obsoleted node. I don't like this. Alternatives welcomed. */ | |
95 | struct semaphore erase_free_sem; | |
96 | ||
8f15fd55 | 97 | #if defined CONFIG_JFFS2_FS_NAND || defined CONFIG_JFFS2_FS_NOR_ECC || defined CONFIG_JFFS2_FS_DATAFLASH |
1da177e4 LT |
98 | /* Write-behind buffer for NAND flash */ |
99 | unsigned char *wbuf; | |
100 | uint32_t wbuf_ofs; | |
101 | uint32_t wbuf_len; | |
102 | uint32_t wbuf_pagesize; | |
103 | struct jffs2_inodirty *wbuf_inodes; | |
104 | ||
105 | struct rw_semaphore wbuf_sem; /* Protects the write buffer */ | |
106 | ||
107 | /* Information about out-of-band area usage... */ | |
108 | struct nand_oobinfo *oobinfo; | |
109 | uint32_t badblock_pos; | |
110 | uint32_t fsdata_pos; | |
111 | uint32_t fsdata_len; | |
112 | #endif | |
113 | ||
114 | /* OS-private pointer for getting back to master superblock info */ | |
115 | void *os_priv; | |
116 | }; | |
117 | ||
118 | #endif /* _JFFS2_FB_SB */ |