2 * JFFS2 -- Journalling Flash File System, Version 2.
4 * Copyright © 2001-2007 Red Hat, Inc.
6 * Created by David Woodhouse <dwmw2@infradead.org>
8 * For licensing information, see the file 'LICENCE' in this directory.
15 #include <linux/types.h>
16 #include <linux/spinlock.h>
17 #include <linux/workqueue.h>
18 #include <linux/completion.h>
19 #include <asm/semaphore.h>
20 #include <linux/timer.h>
21 #include <linux/wait.h>
22 #include <linux/list.h>
23 #include <linux/rwsem.h>
25 #define JFFS2_SB_FLAG_RO 1
26 #define JFFS2_SB_FLAG_SCANNING 2 /* Flash scanning is in progress */
27 #define JFFS2_SB_FLAG_BUILDING 4 /* File system building is in progress */
29 struct jffs2_inodirty;
31 /* A struct for the overall file system control. Pointers to
32 jffs2_sb_info structs are named `c' in the source code.
35 struct jffs2_sb_info {
43 struct task_struct *gc_task; /* GC task struct */
44 struct completion gc_thread_start; /* GC thread start completion */
45 struct completion gc_thread_exit; /* GC thread exit completion port */
47 struct semaphore alloc_sem; /* Used to protect all the following
48 fields, and also to protect against
49 out-of-order writing of nodes. And GC. */
50 uint32_t cleanmarker_size; /* Size of an _inline_ CLEANMARKER
51 (i.e. zero for OOB CLEANMARKER */
58 uint32_t erasing_size;
61 uint32_t unchecked_size;
63 uint32_t nr_free_blocks;
64 uint32_t nr_erasing_blocks;
66 /* Number of free blocks there must be before we... */
67 uint8_t resv_blocks_write; /* ... allow a normal filesystem write */
68 uint8_t resv_blocks_deletion; /* ... allow a normal filesystem deletion */
69 uint8_t resv_blocks_gctrigger; /* ... wake up the GC thread */
70 uint8_t resv_blocks_gcbad; /* ... pick a block from the bad_list to GC */
71 uint8_t resv_blocks_gcmerge; /* ... merge pages when garbage collecting */
73 uint32_t nospc_dirty_size;
76 struct jffs2_eraseblock *blocks; /* The whole array of blocks. Used for getting blocks
77 * from the offset (blocks[ofs / sector_size]) */
78 struct jffs2_eraseblock *nextblock; /* The block we're currently filling */
80 struct jffs2_eraseblock *gcblock; /* The block we're currently garbage-collecting */
82 struct list_head clean_list; /* Blocks 100% full of clean data */
83 struct list_head very_dirty_list; /* Blocks with lots of dirty space */
84 struct list_head dirty_list; /* Blocks with some dirty space */
85 struct list_head erasable_list; /* Blocks which are completely dirty, and need erasing */
86 struct list_head erasable_pending_wbuf_list; /* Blocks which need erasing but only after the current wbuf is flushed */
87 struct list_head erasing_list; /* Blocks which are currently erasing */
88 struct list_head erase_pending_list; /* Blocks which need erasing now */
89 struct list_head erase_complete_list; /* Blocks which are erased and need the clean marker written to them */
90 struct list_head free_list; /* Blocks which are free and ready to be used */
91 struct list_head bad_list; /* Bad blocks. */
92 struct list_head bad_used_list; /* Bad blocks with valid data in. */
94 spinlock_t erase_completion_lock; /* Protect free_list and erasing_list
95 against erase completion handler */
96 wait_queue_head_t erase_wait; /* For waiting for erases to complete */
98 wait_queue_head_t inocache_wq;
99 struct jffs2_inode_cache **inocache_list;
100 spinlock_t inocache_lock;
102 /* Sem to allow jffs2_garbage_collect_deletion_dirent to
103 drop the erase_completion_lock while it's holding a pointer
104 to an obsoleted node. I don't like this. Alternatives welcomed. */
105 struct semaphore erase_free_sem;
107 uint32_t wbuf_pagesize; /* 0 for NOR and other flashes with no wbuf */
109 #ifdef CONFIG_JFFS2_FS_WRITEBUFFER
110 unsigned char *wbuf; /* Write-behind buffer for NAND flash */
113 struct jffs2_inodirty *wbuf_inodes;
114 struct rw_semaphore wbuf_sem; /* Protects the write buffer */
116 unsigned char *oobbuf;
117 int oobavail; /* How many bytes are available for JFFS2 in OOB */
120 struct jffs2_summary *summary; /* Summary information */
122 #ifdef CONFIG_JFFS2_FS_XATTR
123 #define XATTRINDEX_HASHSIZE (57)
124 uint32_t highest_xid;
125 uint32_t highest_xseqno;
126 struct list_head xattrindex[XATTRINDEX_HASHSIZE];
127 struct list_head xattr_unchecked;
128 struct list_head xattr_dead_list;
129 struct jffs2_xattr_ref *xref_dead_list;
130 struct jffs2_xattr_ref *xref_temp;
131 struct rw_semaphore xattr_sem;
132 uint32_t xdatum_mem_usage;
133 uint32_t xdatum_mem_threshold;
135 /* OS-private pointer for getting back to master superblock info */
139 #endif /* _JFFS2_FB_SB */