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Linux/fs/jffs2/jffs2_fs_sb.h

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  1 /*
  2  * JFFS2 -- Journalling Flash File System, Version 2.
  3  *
  4  * Copyright © 2001-2007 Red Hat, Inc.
  5  * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org>
  6  *
  7  * Created by David Woodhouse <dwmw2@infradead.org>
  8  *
  9  * For licensing information, see the file 'LICENCE' in this directory.
 10  *
 11  */
 12 
 13 #ifndef _JFFS2_FS_SB
 14 #define _JFFS2_FS_SB
 15 
 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>
 25 
 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 */
 29 
 30 struct jffs2_inodirty;
 31 
 32 struct jffs2_mount_opts {
 33         bool override_compr;
 34         unsigned int compr;
 35 
 36         /* The size of the reserved pool. The reserved pool is the JFFS2 flash
 37          * space which may only be used by root cannot be used by the other
 38          * users. This is implemented simply by means of not allowing the
 39          * latter users to write to the file system if the amount if the
 40          * available space is less then 'rp_size'. */
 41         unsigned int rp_size;
 42 };
 43 
 44 /* A struct for the overall file system control.  Pointers to
 45    jffs2_sb_info structs are named `c' in the source code.
 46    Nee jffs_control
 47 */
 48 struct jffs2_sb_info {
 49         struct mtd_info *mtd;
 50 
 51         uint32_t highest_ino;
 52         uint32_t check_ino;             /* *NEXT* inode to be checked */
 53 
 54         unsigned int flags;
 55 
 56         struct task_struct *gc_task;    /* GC task struct */
 57         struct completion gc_thread_start; /* GC thread start completion */
 58         struct completion gc_thread_exit; /* GC thread exit completion port */
 59 
 60         struct mutex alloc_sem;         /* Used to protect all the following
 61                                            fields, and also to protect against
 62                                            out-of-order writing of nodes. And GC. */
 63         uint32_t cleanmarker_size;      /* Size of an _inline_ CLEANMARKER
 64                                          (i.e. zero for OOB CLEANMARKER */
 65 
 66         uint32_t flash_size;
 67         uint32_t used_size;
 68         uint32_t dirty_size;
 69         uint32_t wasted_size;
 70         uint32_t free_size;
 71         uint32_t erasing_size;
 72         uint32_t bad_size;
 73         uint32_t sector_size;
 74         uint32_t unchecked_size;
 75 
 76         uint32_t nr_free_blocks;
 77         uint32_t nr_erasing_blocks;
 78 
 79         /* Number of free blocks there must be before we... */
 80         uint8_t resv_blocks_write;      /* ... allow a normal filesystem write */
 81         uint8_t resv_blocks_deletion;   /* ... allow a normal filesystem deletion */
 82         uint8_t resv_blocks_gctrigger;  /* ... wake up the GC thread */
 83         uint8_t resv_blocks_gcbad;      /* ... pick a block from the bad_list to GC */
 84         uint8_t resv_blocks_gcmerge;    /* ... merge pages when garbage collecting */
 85         /* Number of 'very dirty' blocks before we trigger immediate GC */
 86         uint8_t vdirty_blocks_gctrigger;
 87 
 88         uint32_t nospc_dirty_size;
 89 
 90         uint32_t nr_blocks;
 91         struct jffs2_eraseblock *blocks;        /* The whole array of blocks. Used for getting blocks
 92                                                  * from the offset (blocks[ofs / sector_size]) */
 93         struct jffs2_eraseblock *nextblock;     /* The block we're currently filling */
 94 
 95         struct jffs2_eraseblock *gcblock;       /* The block we're currently garbage-collecting */
 96 
 97         struct list_head clean_list;            /* Blocks 100% full of clean data */
 98         struct list_head very_dirty_list;       /* Blocks with lots of dirty space */
 99         struct list_head dirty_list;            /* Blocks with some dirty space */
100         struct list_head erasable_list;         /* Blocks which are completely dirty, and need erasing */
101         struct list_head erasable_pending_wbuf_list;    /* Blocks which need erasing but only after the current wbuf is flushed */
102         struct list_head erasing_list;          /* Blocks which are currently erasing */
103         struct list_head erase_checking_list;   /* Blocks which are being checked and marked */
104         struct list_head erase_pending_list;    /* Blocks which need erasing now */
105         struct list_head erase_complete_list;   /* Blocks which are erased and need the clean marker written to them */
106         struct list_head free_list;             /* Blocks which are free and ready to be used */
107         struct list_head bad_list;              /* Bad blocks. */
108         struct list_head bad_used_list;         /* Bad blocks with valid data in. */
109 
110         spinlock_t erase_completion_lock;       /* Protect free_list and erasing_list
111                                                    against erase completion handler */
112         wait_queue_head_t erase_wait;           /* For waiting for erases to complete */
113 
114         wait_queue_head_t inocache_wq;
115         int inocache_hashsize;
116         struct jffs2_inode_cache **inocache_list;
117         spinlock_t inocache_lock;
118 
119         /* Sem to allow jffs2_garbage_collect_deletion_dirent to
120            drop the erase_completion_lock while it's holding a pointer
121            to an obsoleted node. I don't like this. Alternatives welcomed. */
122         struct mutex erase_free_sem;
123 
124         uint32_t wbuf_pagesize; /* 0 for NOR and other flashes with no wbuf */
125 
126 #ifdef CONFIG_JFFS2_FS_WBUF_VERIFY
127         unsigned char *wbuf_verify; /* read-back buffer for verification */
128 #endif
129 #ifdef CONFIG_JFFS2_FS_WRITEBUFFER
130         unsigned char *wbuf; /* Write-behind buffer for NAND flash */
131         uint32_t wbuf_ofs;
132         uint32_t wbuf_len;
133         struct jffs2_inodirty *wbuf_inodes;
134         struct rw_semaphore wbuf_sem;   /* Protects the write buffer */
135 
136         struct delayed_work wbuf_dwork; /* write-buffer write-out work */
137 
138         unsigned char *oobbuf;
139         int oobavail; /* How many bytes are available for JFFS2 in OOB */
140 #endif
141 
142         struct jffs2_summary *summary;          /* Summary information */
143         struct jffs2_mount_opts mount_opts;
144 
145 #ifdef CONFIG_JFFS2_FS_XATTR
146 #define XATTRINDEX_HASHSIZE     (57)
147         uint32_t highest_xid;
148         uint32_t highest_xseqno;
149         struct list_head xattrindex[XATTRINDEX_HASHSIZE];
150         struct list_head xattr_unchecked;
151         struct list_head xattr_dead_list;
152         struct jffs2_xattr_ref *xref_dead_list;
153         struct jffs2_xattr_ref *xref_temp;
154         struct rw_semaphore xattr_sem;
155         uint32_t xdatum_mem_usage;
156         uint32_t xdatum_mem_threshold;
157 #endif
158         /* OS-private pointer for getting back to master superblock info */
159         void *os_priv;
160 };
161 
162 #endif /* _JFFS2_FS_SB */
163 

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