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1/* $Id: jffs2_fs_sb.h,v 1.48 2004/11/20 10:41:12 dwmw2 Exp $ */
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
19struct 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*/
25struct 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
97#if defined CONFIG_JFFS2_FS_NAND || defined CONFIG_JFFS2_FS_NOR_ECC
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 */