Root/fs/jffs2/jffs2_fs_sb.h

1/*
2 * JFFS2 -- Journalling Flash File System, Version 2.
3 *
4 * Copyright © 2001-2007 Red Hat, Inc.
5 *
6 * Created by David Woodhouse <dwmw2@infradead.org>
7 *
8 * For licensing information, see the file 'LICENCE' in this directory.
9 *
10 */
11
12#ifndef _JFFS2_FS_SB
13#define _JFFS2_FS_SB
14
15#include <linux/types.h>
16#include <linux/spinlock.h>
17#include <linux/workqueue.h>
18#include <linux/completion.h>
19#include <linux/mutex.h>
20#include <linux/timer.h>
21#include <linux/wait.h>
22#include <linux/list.h>
23#include <linux/rwsem.h>
24
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 */
28
29struct jffs2_inodirty;
30
31/* A struct for the overall file system control. Pointers to
32   jffs2_sb_info structs are named `c' in the source code.
33   Nee jffs_control
34*/
35struct jffs2_sb_info {
36    struct mtd_info *mtd;
37
38    uint32_t highest_ino;
39    uint32_t checked_ino;
40
41    unsigned int flags;
42
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 */
46
47    struct mutex 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 */
52
53    uint32_t flash_size;
54    uint32_t used_size;
55    uint32_t dirty_size;
56    uint32_t wasted_size;
57    uint32_t free_size;
58    uint32_t erasing_size;
59    uint32_t bad_size;
60    uint32_t sector_size;
61    uint32_t unchecked_size;
62
63    uint32_t nr_free_blocks;
64    uint32_t nr_erasing_blocks;
65
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 */
72    /* Number of 'very dirty' blocks before we trigger immediate GC */
73    uint8_t vdirty_blocks_gctrigger;
74
75    uint32_t nospc_dirty_size;
76
77    uint32_t nr_blocks;
78    struct jffs2_eraseblock *blocks; /* The whole array of blocks. Used for getting blocks
79                         * from the offset (blocks[ofs / sector_size]) */
80    struct jffs2_eraseblock *nextblock; /* The block we're currently filling */
81
82    struct jffs2_eraseblock *gcblock; /* The block we're currently garbage-collecting */
83
84    struct list_head clean_list; /* Blocks 100% full of clean data */
85    struct list_head very_dirty_list; /* Blocks with lots of dirty space */
86    struct list_head dirty_list; /* Blocks with some dirty space */
87    struct list_head erasable_list; /* Blocks which are completely dirty, and need erasing */
88    struct list_head erasable_pending_wbuf_list; /* Blocks which need erasing but only after the current wbuf is flushed */
89    struct list_head erasing_list; /* Blocks which are currently erasing */
90    struct list_head erase_checking_list; /* Blocks which are being checked and marked */
91    struct list_head erase_pending_list; /* Blocks which need erasing now */
92    struct list_head erase_complete_list; /* Blocks which are erased and need the clean marker written to them */
93    struct list_head free_list; /* Blocks which are free and ready to be used */
94    struct list_head bad_list; /* Bad blocks. */
95    struct list_head bad_used_list; /* Bad blocks with valid data in. */
96
97    spinlock_t erase_completion_lock; /* Protect free_list and erasing_list
98                           against erase completion handler */
99    wait_queue_head_t erase_wait; /* For waiting for erases to complete */
100
101    wait_queue_head_t inocache_wq;
102    struct jffs2_inode_cache **inocache_list;
103    spinlock_t inocache_lock;
104
105    /* Sem to allow jffs2_garbage_collect_deletion_dirent to
106       drop the erase_completion_lock while it's holding a pointer
107       to an obsoleted node. I don't like this. Alternatives welcomed. */
108    struct mutex erase_free_sem;
109
110    uint32_t wbuf_pagesize; /* 0 for NOR and other flashes with no wbuf */
111
112#ifdef CONFIG_JFFS2_FS_WBUF_VERIFY
113    unsigned char *wbuf_verify; /* read-back buffer for verification */
114#endif
115#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
116    unsigned char *wbuf; /* Write-behind buffer for NAND flash */
117    uint32_t wbuf_ofs;
118    uint32_t wbuf_len;
119    struct jffs2_inodirty *wbuf_inodes;
120    struct rw_semaphore wbuf_sem; /* Protects the write buffer */
121
122    unsigned char *oobbuf;
123    int oobavail; /* How many bytes are available for JFFS2 in OOB */
124#endif
125
126    struct jffs2_summary *summary; /* Summary information */
127
128#ifdef CONFIG_JFFS2_FS_XATTR
129#define XATTRINDEX_HASHSIZE (57)
130    uint32_t highest_xid;
131    uint32_t highest_xseqno;
132    struct list_head xattrindex[XATTRINDEX_HASHSIZE];
133    struct list_head xattr_unchecked;
134    struct list_head xattr_dead_list;
135    struct jffs2_xattr_ref *xref_dead_list;
136    struct jffs2_xattr_ref *xref_temp;
137    struct rw_semaphore xattr_sem;
138    uint32_t xdatum_mem_usage;
139    uint32_t xdatum_mem_threshold;
140#endif
141    /* OS-private pointer for getting back to master superblock info */
142    void *os_priv;
143};
144
145#endif /* _JFFS2_FB_SB */
146

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