1 | /* |
---|
2 | * JFFS2 -- Journalling Flash File System, Version 2. |
---|
3 | * |
---|
4 | * Copyright © 2001-2007 Red Hat, Inc. |
---|
5 | * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org> |
---|
6 | * |
---|
7 | * Created by David Woodhouse <dwmw2@infradead.org> |
---|
8 | * |
---|
9 | * For licensing information, see the file 'LICENCE' in this directory. |
---|
10 | * |
---|
11 | */ |
---|
12 | |
---|
13 | #ifndef _JFFS2_FS_SB |
---|
14 | #define _JFFS2_FS_SB |
---|
15 | |
---|
16 | #include <linux/types.h> |
---|
17 | #include <linux/spinlock.h> |
---|
18 | #include <linux/workqueue.h> |
---|
19 | #include <linux/completion.h> |
---|
20 | #include <linux/mutex.h> |
---|
21 | #include <linux/timer.h> |
---|
22 | #include <linux/wait.h> |
---|
23 | #include <linux/list.h> |
---|
24 | #include <linux/rwsem.h> |
---|
25 | |
---|
26 | #define JFFS2_SB_FLAG_RO 1 |
---|
27 | #define JFFS2_SB_FLAG_SCANNING 2 /* Flash scanning is in progress */ |
---|
28 | #define JFFS2_SB_FLAG_BUILDING 4 /* File system building is in progress */ |
---|
29 | |
---|
30 | struct jffs2_inodirty; |
---|
31 | |
---|
32 | struct jffs2_mount_opts { |
---|
33 | bool override_compr; |
---|
34 | unsigned int compr; |
---|
35 | |
---|
36 | /* The size of the reserved pool. The reserved pool is the JFFS2 flash |
---|
37 | * space which may only be used by root cannot be used by the other |
---|
38 | * users. This is implemented simply by means of not allowing the |
---|
39 | * latter users to write to the file system if the amount if the |
---|
40 | * available space is less then 'rp_size'. */ |
---|
41 | unsigned int rp_size; |
---|
42 | }; |
---|
43 | |
---|
44 | /* A struct for the overall file system control. Pointers to |
---|
45 | jffs2_sb_info structs are named `c' in the source code. |
---|
46 | Nee jffs_control |
---|
47 | */ |
---|
48 | struct jffs2_sb_info { |
---|
49 | struct mtd_info *mtd; |
---|
50 | |
---|
51 | uint32_t highest_ino; |
---|
52 | uint32_t checked_ino; |
---|
53 | |
---|
54 | unsigned int flags; |
---|
55 | |
---|
56 | struct task_struct *gc_task; /* GC task struct */ |
---|
57 | struct completion gc_thread_start; /* GC thread start completion */ |
---|
58 | struct completion gc_thread_exit; /* GC thread exit completion port */ |
---|
59 | |
---|
60 | struct mutex alloc_sem; /* Used to protect all the following |
---|
61 | fields, and also to protect against |
---|
62 | out-of-order writing of nodes. And GC. */ |
---|
63 | uint32_t cleanmarker_size; /* Size of an _inline_ CLEANMARKER |
---|
64 | (i.e. zero for OOB CLEANMARKER */ |
---|
65 | |
---|
66 | uint32_t flash_size; |
---|
67 | uint32_t used_size; |
---|
68 | uint32_t dirty_size; |
---|
69 | uint32_t wasted_size; |
---|
70 | uint32_t free_size; |
---|
71 | uint32_t erasing_size; |
---|
72 | uint32_t bad_size; |
---|
73 | uint32_t sector_size; |
---|
74 | uint32_t unchecked_size; |
---|
75 | |
---|
76 | uint32_t nr_free_blocks; |
---|
77 | uint32_t nr_erasing_blocks; |
---|
78 | |
---|
79 | /* Number of free blocks there must be before we... */ |
---|
80 | uint8_t resv_blocks_write; /* ... allow a normal filesystem write */ |
---|
81 | uint8_t resv_blocks_deletion; /* ... allow a normal filesystem deletion */ |
---|
82 | uint8_t resv_blocks_gctrigger; /* ... wake up the GC thread */ |
---|
83 | uint8_t resv_blocks_gcbad; /* ... pick a block from the bad_list to GC */ |
---|
84 | uint8_t resv_blocks_gcmerge; /* ... merge pages when garbage collecting */ |
---|
85 | /* Number of 'very dirty' blocks before we trigger immediate GC */ |
---|
86 | uint8_t vdirty_blocks_gctrigger; |
---|
87 | |
---|
88 | uint32_t nospc_dirty_size; |
---|
89 | |
---|
90 | uint32_t nr_blocks; |
---|
91 | struct jffs2_eraseblock *blocks; /* The whole array of blocks. Used for getting blocks |
---|
92 | * from the offset (blocks[ofs / sector_size]) */ |
---|
93 | struct jffs2_eraseblock *nextblock; /* The block we're currently filling */ |
---|
94 | |
---|
95 | struct jffs2_eraseblock *gcblock; /* The block we're currently garbage-collecting */ |
---|
96 | |
---|
97 | struct list_head clean_list; /* Blocks 100% full of clean data */ |
---|
98 | struct list_head very_dirty_list; /* Blocks with lots of dirty space */ |
---|
99 | struct list_head dirty_list; /* Blocks with some dirty space */ |
---|
100 | struct list_head erasable_list; /* Blocks which are completely dirty, and need erasing */ |
---|
101 | struct list_head erasable_pending_wbuf_list; /* Blocks which need erasing but only after the current wbuf is flushed */ |
---|
102 | struct list_head erasing_list; /* Blocks which are currently erasing */ |
---|
103 | struct list_head erase_checking_list; /* Blocks which are being checked and marked */ |
---|
104 | struct list_head erase_pending_list; /* Blocks which need erasing now */ |
---|
105 | struct list_head erase_complete_list; /* Blocks which are erased and need the clean marker written to them */ |
---|
106 | struct list_head free_list; /* Blocks which are free and ready to be used */ |
---|
107 | struct list_head bad_list; /* Bad blocks. */ |
---|
108 | struct list_head bad_used_list; /* Bad blocks with valid data in. */ |
---|
109 | |
---|
110 | spinlock_t erase_completion_lock; /* Protect free_list and erasing_list |
---|
111 | against erase completion handler */ |
---|
112 | wait_queue_head_t erase_wait; /* For waiting for erases to complete */ |
---|
113 | |
---|
114 | wait_queue_head_t inocache_wq; |
---|
115 | int inocache_hashsize; |
---|
116 | struct jffs2_inode_cache **inocache_list; |
---|
117 | spinlock_t inocache_lock; |
---|
118 | |
---|
119 | /* Sem to allow jffs2_garbage_collect_deletion_dirent to |
---|
120 | drop the erase_completion_lock while it's holding a pointer |
---|
121 | to an obsoleted node. I don't like this. Alternatives welcomed. */ |
---|
122 | struct mutex erase_free_sem; |
---|
123 | |
---|
124 | uint32_t wbuf_pagesize; /* 0 for NOR and other flashes with no wbuf */ |
---|
125 | |
---|
126 | #ifdef CONFIG_JFFS2_FS_WBUF_VERIFY |
---|
127 | unsigned char *wbuf_verify; /* read-back buffer for verification */ |
---|
128 | #endif |
---|
129 | #ifdef CONFIG_JFFS2_FS_WRITEBUFFER |
---|
130 | unsigned char *wbuf; /* Write-behind buffer for NAND flash */ |
---|
131 | uint32_t wbuf_ofs; |
---|
132 | uint32_t wbuf_len; |
---|
133 | struct jffs2_inodirty *wbuf_inodes; |
---|
134 | struct rw_semaphore wbuf_sem; /* Protects the write buffer */ |
---|
135 | |
---|
136 | struct delayed_work wbuf_dwork; /* write-buffer write-out work */ |
---|
137 | int wbuf_queued; /* non-zero delayed work is queued */ |
---|
138 | spinlock_t wbuf_dwork_lock; /* protects wbuf_dwork and and wbuf_queued */ |
---|
139 | |
---|
140 | unsigned char *oobbuf; |
---|
141 | int oobavail; /* How many bytes are available for JFFS2 in OOB */ |
---|
142 | #endif |
---|
143 | |
---|
144 | struct jffs2_summary *summary; /* Summary information */ |
---|
145 | struct jffs2_mount_opts mount_opts; |
---|
146 | |
---|
147 | #ifdef CONFIG_JFFS2_FS_XATTR |
---|
148 | #define XATTRINDEX_HASHSIZE (57) |
---|
149 | uint32_t highest_xid; |
---|
150 | uint32_t highest_xseqno; |
---|
151 | struct list_head xattrindex[XATTRINDEX_HASHSIZE]; |
---|
152 | struct list_head xattr_unchecked; |
---|
153 | struct list_head xattr_dead_list; |
---|
154 | struct jffs2_xattr_ref *xref_dead_list; |
---|
155 | struct jffs2_xattr_ref *xref_temp; |
---|
156 | struct rw_semaphore xattr_sem; |
---|
157 | uint32_t xdatum_mem_usage; |
---|
158 | uint32_t xdatum_mem_threshold; |
---|
159 | #endif |
---|
160 | /* OS-private pointer for getting back to master superblock info */ |
---|
161 | void *os_priv; |
---|
162 | }; |
---|
163 | |
---|
164 | #endif /* _JFFS2_FS_SB */ |
---|