2 * JFFS2 -- Journalling Flash File System, Version 2.
4 * Copyright © 2001-2007 Red Hat, Inc.
5 * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org>
7 * Created by David Woodhouse <dwmw2@infradead.org>
9 * For licensing information, see the file 'LICENCE' in this directory.
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>
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 */
30 struct jffs2_inodirty
;
32 struct jffs2_mount_opts
{
37 /* A struct for the overall file system control. Pointers to
38 jffs2_sb_info structs are named `c' in the source code.
41 struct jffs2_sb_info
{
49 struct task_struct
*gc_task
; /* GC task struct */
50 struct completion gc_thread_start
; /* GC thread start completion */
51 struct completion gc_thread_exit
; /* GC thread exit completion port */
53 struct mutex alloc_sem
; /* Used to protect all the following
54 fields, and also to protect against
55 out-of-order writing of nodes. And GC. */
56 uint32_t cleanmarker_size
; /* Size of an _inline_ CLEANMARKER
57 (i.e. zero for OOB CLEANMARKER */
64 uint32_t erasing_size
;
67 uint32_t unchecked_size
;
69 uint32_t nr_free_blocks
;
70 uint32_t nr_erasing_blocks
;
72 /* Number of free blocks there must be before we... */
73 uint8_t resv_blocks_write
; /* ... allow a normal filesystem write */
74 uint8_t resv_blocks_deletion
; /* ... allow a normal filesystem deletion */
75 uint8_t resv_blocks_gctrigger
; /* ... wake up the GC thread */
76 uint8_t resv_blocks_gcbad
; /* ... pick a block from the bad_list to GC */
77 uint8_t resv_blocks_gcmerge
; /* ... merge pages when garbage collecting */
78 /* Number of 'very dirty' blocks before we trigger immediate GC */
79 uint8_t vdirty_blocks_gctrigger
;
81 uint32_t nospc_dirty_size
;
84 struct jffs2_eraseblock
*blocks
; /* The whole array of blocks. Used for getting blocks
85 * from the offset (blocks[ofs / sector_size]) */
86 struct jffs2_eraseblock
*nextblock
; /* The block we're currently filling */
88 struct jffs2_eraseblock
*gcblock
; /* The block we're currently garbage-collecting */
90 struct list_head clean_list
; /* Blocks 100% full of clean data */
91 struct list_head very_dirty_list
; /* Blocks with lots of dirty space */
92 struct list_head dirty_list
; /* Blocks with some dirty space */
93 struct list_head erasable_list
; /* Blocks which are completely dirty, and need erasing */
94 struct list_head erasable_pending_wbuf_list
; /* Blocks which need erasing but only after the current wbuf is flushed */
95 struct list_head erasing_list
; /* Blocks which are currently erasing */
96 struct list_head erase_checking_list
; /* Blocks which are being checked and marked */
97 struct list_head erase_pending_list
; /* Blocks which need erasing now */
98 struct list_head erase_complete_list
; /* Blocks which are erased and need the clean marker written to them */
99 struct list_head free_list
; /* Blocks which are free and ready to be used */
100 struct list_head bad_list
; /* Bad blocks. */
101 struct list_head bad_used_list
; /* Bad blocks with valid data in. */
103 spinlock_t erase_completion_lock
; /* Protect free_list and erasing_list
104 against erase completion handler */
105 wait_queue_head_t erase_wait
; /* For waiting for erases to complete */
107 wait_queue_head_t inocache_wq
;
108 int inocache_hashsize
;
109 struct jffs2_inode_cache
**inocache_list
;
110 spinlock_t inocache_lock
;
112 /* Sem to allow jffs2_garbage_collect_deletion_dirent to
113 drop the erase_completion_lock while it's holding a pointer
114 to an obsoleted node. I don't like this. Alternatives welcomed. */
115 struct mutex erase_free_sem
;
117 uint32_t wbuf_pagesize
; /* 0 for NOR and other flashes with no wbuf */
119 #ifdef CONFIG_JFFS2_FS_WBUF_VERIFY
120 unsigned char *wbuf_verify
; /* read-back buffer for verification */
122 #ifdef CONFIG_JFFS2_FS_WRITEBUFFER
123 unsigned char *wbuf
; /* Write-behind buffer for NAND flash */
126 struct jffs2_inodirty
*wbuf_inodes
;
127 struct rw_semaphore wbuf_sem
; /* Protects the write buffer */
129 struct delayed_work wbuf_dwork
; /* write-buffer write-out work */
130 int wbuf_queued
; /* non-zero delayed work is queued */
131 spinlock_t wbuf_dwork_lock
; /* protects wbuf_dwork and and wbuf_queued */
133 unsigned char *oobbuf
;
134 int oobavail
; /* How many bytes are available for JFFS2 in OOB */
137 struct jffs2_summary
*summary
; /* Summary information */
138 struct jffs2_mount_opts mount_opts
;
140 #ifdef CONFIG_JFFS2_FS_XATTR
141 #define XATTRINDEX_HASHSIZE (57)
142 uint32_t highest_xid
;
143 uint32_t highest_xseqno
;
144 struct list_head xattrindex
[XATTRINDEX_HASHSIZE
];
145 struct list_head xattr_unchecked
;
146 struct list_head xattr_dead_list
;
147 struct jffs2_xattr_ref
*xref_dead_list
;
148 struct jffs2_xattr_ref
*xref_temp
;
149 struct rw_semaphore xattr_sem
;
150 uint32_t xdatum_mem_usage
;
151 uint32_t xdatum_mem_threshold
;
153 /* OS-private pointer for getting back to master superblock info */
157 #endif /* _JFFS2_FS_SB */