1 /* $Id: jffs2_fs_sb.h,v 1.52 2005/05/19 16:12:17 gleixner 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 {
34 struct task_struct *gc_task; /* GC task struct */
35 struct completion gc_thread_start; /* GC thread start completion */
36 struct completion gc_thread_exit; /* GC thread exit completion port */
38 struct semaphore alloc_sem; /* Used to protect all the following
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 */
49 uint32_t erasing_size;
52 uint32_t unchecked_size;
54 uint32_t nr_free_blocks;
55 uint32_t nr_erasing_blocks;
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 */
64 uint32_t nospc_dirty_size;
67 struct jffs2_eraseblock *blocks; /* The whole array of blocks. Used for getting blocks
68 * from the offset (blocks[ofs / sector_size]) */
69 struct jffs2_eraseblock *nextblock; /* The block we're currently filling */
71 struct jffs2_eraseblock *gcblock; /* The block we're currently garbage-collecting */
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. */
85 spinlock_t erase_completion_lock; /* Protect free_list and erasing_list
86 against erase completion handler */
87 wait_queue_head_t erase_wait; /* For waiting for erases to complete */
89 wait_queue_head_t inocache_wq;
90 struct jffs2_inode_cache **inocache_list;
91 spinlock_t inocache_lock;
93 /* Sem to allow jffs2_garbage_collect_deletion_dirent to
94 drop the erase_completion_lock while it's holding a pointer
95 to an obsoleted node. I don't like this. Alternatives welcomed. */
96 struct semaphore erase_free_sem;
98 #ifdef CONFIG_JFFS2_FS_WRITEBUFFER
99 /* Write-behind buffer for NAND flash */
103 uint32_t wbuf_pagesize;
104 struct jffs2_inodirty *wbuf_inodes;
106 struct rw_semaphore wbuf_sem; /* Protects the write buffer */
108 /* Information about out-of-band area usage... */
109 struct nand_oobinfo *oobinfo;
110 uint32_t badblock_pos;
115 /* OS-private pointer for getting back to master superblock info */
119 #endif /* _JFFS2_FB_SB */