1 /* $Id: jffs2_fs_sb.h,v 1.54 2005/09/21 13:37:34 dedekind Exp $ */
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>
16 #define JFFS2_SB_FLAG_RO 1
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 */
20 struct jffs2_inodirty
;
22 /* A struct for the overall file system control. Pointers to
23 jffs2_sb_info structs are named `c' in the source code.
26 struct jffs2_sb_info
{
29 struct jffs2_raw_node_ref
*refs
;
37 struct task_struct
*gc_task
; /* GC task struct */
38 struct completion gc_thread_start
; /* GC thread start completion */
39 struct completion gc_thread_exit
; /* GC thread exit completion port */
41 struct semaphore alloc_sem
; /* Used to protect all the following
42 fields, and also to protect against
43 out-of-order writing of nodes. And GC. */
44 uint32_t cleanmarker_size
; /* Size of an _inline_ CLEANMARKER
45 (i.e. zero for OOB CLEANMARKER */
52 uint32_t erasing_size
;
55 uint32_t unchecked_size
;
57 uint32_t nr_free_blocks
;
58 uint32_t nr_erasing_blocks
;
60 /* Number of free blocks there must be before we... */
61 uint8_t resv_blocks_write
; /* ... allow a normal filesystem write */
62 uint8_t resv_blocks_deletion
; /* ... allow a normal filesystem deletion */
63 uint8_t resv_blocks_gctrigger
; /* ... wake up the GC thread */
64 uint8_t resv_blocks_gcbad
; /* ... pick a block from the bad_list to GC */
65 uint8_t resv_blocks_gcmerge
; /* ... merge pages when garbage collecting */
67 uint32_t nospc_dirty_size
;
70 struct jffs2_eraseblock
*blocks
; /* The whole array of blocks. Used for getting blocks
71 * from the offset (blocks[ofs / sector_size]) */
72 struct jffs2_eraseblock
*nextblock
; /* The block we're currently filling */
74 struct jffs2_eraseblock
*gcblock
; /* The block we're currently garbage-collecting */
76 struct list_head clean_list
; /* Blocks 100% full of clean data */
77 struct list_head very_dirty_list
; /* Blocks with lots of dirty space */
78 struct list_head dirty_list
; /* Blocks with some dirty space */
79 struct list_head erasable_list
; /* Blocks which are completely dirty, and need erasing */
80 struct list_head erasable_pending_wbuf_list
; /* Blocks which need erasing but only after the current wbuf is flushed */
81 struct list_head erasing_list
; /* Blocks which are currently erasing */
82 struct list_head erase_pending_list
; /* Blocks which need erasing now */
83 struct list_head erase_complete_list
; /* Blocks which are erased and need the clean marker written to them */
84 struct list_head free_list
; /* Blocks which are free and ready to be used */
85 struct list_head bad_list
; /* Bad blocks. */
86 struct list_head bad_used_list
; /* Bad blocks with valid data in. */
88 spinlock_t erase_completion_lock
; /* Protect free_list and erasing_list
89 against erase completion handler */
90 wait_queue_head_t erase_wait
; /* For waiting for erases to complete */
92 wait_queue_head_t inocache_wq
;
93 struct jffs2_inode_cache
**inocache_list
;
94 spinlock_t inocache_lock
;
96 /* Sem to allow jffs2_garbage_collect_deletion_dirent to
97 drop the erase_completion_lock while it's holding a pointer
98 to an obsoleted node. I don't like this. Alternatives welcomed. */
99 struct semaphore erase_free_sem
;
101 uint32_t wbuf_pagesize
; /* 0 for NOR and other flashes with no wbuf */
103 #ifdef CONFIG_JFFS2_FS_WRITEBUFFER
104 /* Write-behind buffer for NAND flash */
108 struct jffs2_inodirty
*wbuf_inodes
;
110 struct rw_semaphore wbuf_sem
; /* Protects the write buffer */
112 /* Information about out-of-band area usage... */
113 struct nand_oobinfo
*oobinfo
;
114 uint32_t badblock_pos
;
119 struct jffs2_summary
*summary
; /* Summary information */
121 #ifdef CONFIG_JFFS2_FS_XATTR
122 #define XATTRINDEX_HASHSIZE (57)
123 uint32_t highest_xid
;
124 struct list_head xattrindex
[XATTRINDEX_HASHSIZE
];
125 struct list_head xattr_unchecked
;
126 struct jffs2_xattr_ref
*xref_temp
;
127 struct rw_semaphore xattr_sem
;
128 uint32_t xdatum_mem_usage
;
129 uint32_t xdatum_mem_threshold
;
131 /* OS-private pointer for getting back to master superblock info */
135 #endif /* _JFFS2_FB_SB */