ia64/linux-2.6.18-xen.hg

view fs/jffs2/jffs2_fs_sb.h @ 524:7f8b544237bf

netfront: Allow netfront in domain 0.

This is useful if your physical network device is in a utility domain.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Tue Apr 15 15:18:58 2008 +0100 (2008-04-15)
parents 831230e53067
children
line source
1 /* $Id: jffs2_fs_sb.h,v 1.54 2005/09/21 13:37:34 dedekind Exp $ */
3 #ifndef _JFFS2_FS_SB
4 #define _JFFS2_FS_SB
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.
24 Nee jffs_control
25 */
26 struct jffs2_sb_info {
27 struct mtd_info *mtd;
29 uint32_t highest_ino;
30 uint32_t checked_ino;
32 unsigned int flags;
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 */
44 uint32_t flash_size;
45 uint32_t used_size;
46 uint32_t dirty_size;
47 uint32_t wasted_size;
48 uint32_t free_size;
49 uint32_t erasing_size;
50 uint32_t bad_size;
51 uint32_t sector_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;
66 uint32_t nr_blocks;
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 uint32_t wbuf_pagesize; /* 0 for NOR and other flashes with no wbuf */
100 #ifdef CONFIG_JFFS2_FS_WRITEBUFFER
101 /* Write-behind buffer for NAND flash */
102 unsigned char *wbuf;
103 unsigned char *oobbuf;
104 uint32_t wbuf_ofs;
105 uint32_t wbuf_len;
106 struct jffs2_inodirty *wbuf_inodes;
108 struct rw_semaphore wbuf_sem; /* Protects the write buffer */
110 /* Information about out-of-band area usage... */
111 struct nand_ecclayout *ecclayout;
112 uint32_t badblock_pos;
113 uint32_t fsdata_pos;
114 uint32_t fsdata_len;
115 #endif
117 struct jffs2_summary *summary; /* Summary information */
119 #ifdef CONFIG_JFFS2_FS_XATTR
120 #define XATTRINDEX_HASHSIZE (57)
121 uint32_t highest_xid;
122 uint32_t highest_xseqno;
123 struct list_head xattrindex[XATTRINDEX_HASHSIZE];
124 struct list_head xattr_unchecked;
125 struct list_head xattr_dead_list;
126 struct jffs2_xattr_ref *xref_dead_list;
127 struct jffs2_xattr_ref *xref_temp;
128 struct rw_semaphore xattr_sem;
129 uint32_t xdatum_mem_usage;
130 uint32_t xdatum_mem_threshold;
131 #endif
132 /* OS-private pointer for getting back to master superblock info */
133 void *os_priv;
134 };
136 #endif /* _JFFS2_FB_SB */