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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [mtd/] [mtdblock_ro.c] - Blame information for rev 1774

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/*
 * $Id: mtdblock_ro.c,v 1.1.1.1 2004-04-15 01:51:40 phoenix Exp $
 *
 * Read-only version of the mtdblock device, without the
 * read/erase/modify/writeback stuff
 */
 
#ifdef MTDBLOCK_DEBUG
#define DEBUGLVL debug
#endif                                                         
 
 
#include <linux/module.h>
#include <linux/types.h>
 
#include <linux/mtd/mtd.h>
#include <linux/mtd/compatmac.h>
 
#define MAJOR_NR MTD_BLOCK_MAJOR
#define DEVICE_NAME "mtdblock"
#define DEVICE_REQUEST mtdblock_request
#define DEVICE_NR(device) (device)
#define DEVICE_ON(device)
#define DEVICE_OFF(device)
#define DEVICE_NO_RANDOM
#include <linux/blk.h>
 
#if LINUX_VERSION_CODE < 0x20300
#define RQFUNC_ARG void
#define blkdev_dequeue_request(req) do {CURRENT = req->next;} while (0)
#else
#define RQFUNC_ARG request_queue_t *q
#endif
 
#ifdef MTDBLOCK_DEBUG
static int debug = MTDBLOCK_DEBUG;
MODULE_PARM(debug, "i");
#endif
 
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,4,14)
#define BLK_INC_USE_COUNT MOD_INC_USE_COUNT
#define BLK_DEC_USE_COUNT MOD_DEC_USE_COUNT
#else
#define BLK_INC_USE_COUNT do {} while(0)
#define BLK_DEC_USE_COUNT do {} while(0)
#endif
 
static int mtd_sizes[MAX_MTD_DEVICES];
 
 
static int mtdblock_open(struct inode *inode, struct file *file)
{
        struct mtd_info *mtd = NULL;
 
        int dev;
 
        DEBUG(1,"mtdblock_open\n");
 
        if (inode == 0)
                return -EINVAL;
 
        dev = MINOR(inode->i_rdev);
 
        mtd = get_mtd_device(NULL, dev);
        if (!mtd)
                return -EINVAL;
        if (MTD_ABSENT == mtd->type) {
                put_mtd_device(mtd);
                return -EINVAL;
        }
 
        BLK_INC_USE_COUNT;
 
        mtd_sizes[dev] = mtd->size>>9;
 
        DEBUG(1, "ok\n");
 
        return 0;
}
 
static release_t mtdblock_release(struct inode *inode, struct file *file)
{
        int dev;
        struct mtd_info *mtd;
 
        DEBUG(1, "mtdblock_release\n");
 
        if (inode == NULL)
                release_return(-ENODEV);
 
        dev = MINOR(inode->i_rdev);
        mtd = __get_mtd_device(NULL, dev);
 
        if (!mtd) {
                printk(KERN_WARNING "MTD device is absent on mtd_release!\n");
                BLK_DEC_USE_COUNT;
                release_return(-ENODEV);
        }
 
        if (mtd->sync)
                mtd->sync(mtd);
 
        put_mtd_device(mtd);
 
        DEBUG(1, "ok\n");
 
        BLK_DEC_USE_COUNT;
        release_return(0);
}
 
 
static void mtdblock_request(RQFUNC_ARG)
{
   struct request *current_request;
   unsigned int res = 0;
   struct mtd_info *mtd;
 
   while (1)
   {
      /* Grab the Request and unlink it from the request list, INIT_REQUEST
         will execute a return if we are done. */
      INIT_REQUEST;
      current_request = CURRENT;
 
      if (MINOR(current_request->rq_dev) >= MAX_MTD_DEVICES)
      {
         printk("mtd: Unsupported device!\n");
         end_request(0);
         continue;
      }
 
      // Grab our MTD structure
 
      mtd = __get_mtd_device(NULL, MINOR(current_request->rq_dev));
      if (!mtd) {
              printk("MTD device %d doesn't appear to exist any more\n", CURRENT_DEV);
              end_request(0);
      }
 
      if (current_request->sector << 9 > mtd->size ||
          (current_request->sector + current_request->current_nr_sectors) << 9 > mtd->size)
      {
         printk("mtd: Attempt to read past end of device!\n");
         printk("size: %x, sector: %lx, nr_sectors %lx\n", mtd->size,
                current_request->sector, current_request->current_nr_sectors);
         end_request(0);
         continue;
      }
 
      /* Remove the request we are handling from the request list so nobody messes
         with it */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)
      /* Now drop the lock that the ll_rw_blk functions grabbed for us
         and process the request. This is necessary due to the extreme time
         we spend processing it. */
      spin_unlock_irq(&io_request_lock);
#endif
 
      // Handle the request
      switch (current_request->cmd)
      {
         size_t retlen;
 
         case READ:
         if (MTD_READ(mtd,current_request->sector<<9,
                      current_request->current_nr_sectors << 9,
                      &retlen, current_request->buffer) == 0)
            res = 1;
         else
            res = 0;
         break;
 
         case WRITE:
 
         /* printk("mtdblock_request WRITE sector=%d(%d)\n",current_request->sector,
                current_request->current_nr_sectors);
         */
 
         // Read only device
         if ((mtd->flags & MTD_CAP_RAM) == 0)
         {
            res = 0;
            break;
         }
 
         // Do the write
         if (MTD_WRITE(mtd,current_request->sector<<9,
                       current_request->current_nr_sectors << 9,
                       &retlen, current_request->buffer) == 0)
            res = 1;
         else
            res = 0;
         break;
 
         // Shouldn't happen
         default:
         printk("mtd: unknown request\n");
         break;
      }
 
      // Grab the lock and re-thread the item onto the linked list
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)
        spin_lock_irq(&io_request_lock);
#endif
        end_request(res);
   }
}
 
 
 
static int mtdblock_ioctl(struct inode * inode, struct file * file,
                      unsigned int cmd, unsigned long arg)
{
        struct mtd_info *mtd;
 
        mtd = __get_mtd_device(NULL, MINOR(inode->i_rdev));
 
        if (!mtd) return -EINVAL;
 
        switch (cmd) {
        case BLKGETSIZE:   /* Return device size */
                return put_user((mtd->size >> 9), (unsigned long *) arg);
 
#ifdef BLKGETSIZE64
        case BLKGETSIZE64:
                return put_user((u64)mtd->size, (u64 *)arg);
#endif
 
        case BLKFLSBUF:
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)
                if(!capable(CAP_SYS_ADMIN))  return -EACCES;
#endif
                fsync_dev(inode->i_rdev);
                invalidate_buffers(inode->i_rdev);
                if (mtd->sync)
                        mtd->sync(mtd);
                return 0;
 
        default:
                return -ENOTTY;
        }
}
 
#if LINUX_VERSION_CODE < 0x20326
static struct file_operations mtd_fops =
{
        open: mtdblock_open,
        ioctl: mtdblock_ioctl,
        release: mtdblock_release,
        read: block_read,
        write: block_write
};
#else
static struct block_device_operations mtd_fops =
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,14)
        owner: THIS_MODULE,
#endif
        open: mtdblock_open,
        release: mtdblock_release,
        ioctl: mtdblock_ioctl
};
#endif
 
int __init init_mtdblock(void)
{
        int i;
 
        if (register_blkdev(MAJOR_NR,DEVICE_NAME,&mtd_fops)) {
                printk(KERN_NOTICE "Can't allocate major number %d for Memory Technology Devices.\n",
                       MTD_BLOCK_MAJOR);
                return -EAGAIN;
        }
 
        /* We fill it in at open() time. */
        for (i=0; i< MAX_MTD_DEVICES; i++) {
                mtd_sizes[i] = 0;
        }
 
        /* Allow the block size to default to BLOCK_SIZE. */
        blksize_size[MAJOR_NR] = NULL;
        blk_size[MAJOR_NR] = mtd_sizes;
 
        blk_init_queue(BLK_DEFAULT_QUEUE(MAJOR_NR), &mtdblock_request);
        return 0;
}
 
static void __exit cleanup_mtdblock(void)
{
        unregister_blkdev(MAJOR_NR,DEVICE_NAME);
        blk_size[MAJOR_NR] = NULL;
        blk_cleanup_queue(BLK_DEFAULT_QUEUE(MAJOR_NR));
}
 
module_init(init_mtdblock);
module_exit(cleanup_mtdblock);
 
 
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Erwin Authried <eauth@softsys.co.at> et al.");
MODULE_DESCRIPTION("Simple read-only block device emulation access to MTD devices");

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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [mtd/] [mtdblock_ro.c] - Blame information for rev 1774

Line No.	Rev	Author	Line
1	1275	phoenix	`/*`
2			`* $Id: mtdblock_ro.c,v 1.1.1.1 2004-04-15 01:51:40 phoenix Exp $`
3			`*`
4			`* Read-only version of the mtdblock device, without the`
5			`* read/erase/modify/writeback stuff`
6			`*/`
7
8			`#ifdef MTDBLOCK_DEBUG`
9			`#define DEBUGLVL debug`
10			`#endif`
11
12
13			`#include <linux/module.h>`
14			`#include <linux/types.h>`
15
16			`#include <linux/mtd/mtd.h>`
17			`#include <linux/mtd/compatmac.h>`
18
19			`#define MAJOR_NR MTD_BLOCK_MAJOR`
20			`#define DEVICE_NAME "mtdblock"`
21			`#define DEVICE_REQUEST mtdblock_request`
22			`#define DEVICE_NR(device) (device)`
23			`#define DEVICE_ON(device)`
24			`#define DEVICE_OFF(device)`
25			`#define DEVICE_NO_RANDOM`
26			`#include <linux/blk.h>`
27
28			`#if LINUX_VERSION_CODE < 0x20300`
29			`#define RQFUNC_ARG void`
30			`#define blkdev_dequeue_request(req) do {CURRENT = req->next;} while (0)`
31			`#else`
32			`#define RQFUNC_ARG request_queue_t *q`
33			`#endif`
34
35			`#ifdef MTDBLOCK_DEBUG`
36			`static int debug = MTDBLOCK_DEBUG;`
37			`MODULE_PARM(debug, "i");`
38			`#endif`
39
40			`#if LINUX_VERSION_CODE < KERNEL_VERSION(2,4,14)`
41			`#define BLK_INC_USE_COUNT MOD_INC_USE_COUNT`
42			`#define BLK_DEC_USE_COUNT MOD_DEC_USE_COUNT`
43			`#else`
44			`#define BLK_INC_USE_COUNT do {} while(0)`
45			`#define BLK_DEC_USE_COUNT do {} while(0)`
46			`#endif`
47
48			`static int mtd_sizes[MAX_MTD_DEVICES];`
49
50
51			`static int mtdblock_open(struct inode inode, struct file file)`
52			`{`
53			`struct mtd_info *mtd = NULL;`
54
55			`int dev;`
56
57			`DEBUG(1,"mtdblock_open\n");`
58
59			`if (inode == 0)`
60			`return -EINVAL;`
61
62			`dev = MINOR(inode->i_rdev);`
63
64			`mtd = get_mtd_device(NULL, dev);`
65			`if (!mtd)`
66			`return -EINVAL;`
67			`if (MTD_ABSENT == mtd->type) {`
68			`put_mtd_device(mtd);`
69			`return -EINVAL;`
70			`}`
71
72			`BLK_INC_USE_COUNT;`
73
74			`mtd_sizes[dev] = mtd->size>>9;`
75
76			`DEBUG(1, "ok\n");`
77
78			`return 0;`
79			`}`
80
81			`static release_t mtdblock_release(struct inode inode, struct file file)`
82			`{`
83			`int dev;`
84			`struct mtd_info *mtd;`
85
86			`DEBUG(1, "mtdblock_release\n");`
87
88			`if (inode == NULL)`
89			`release_return(-ENODEV);`
90
91			`dev = MINOR(inode->i_rdev);`
92			`mtd = __get_mtd_device(NULL, dev);`
93
94			`if (!mtd) {`
95			`printk(KERN_WARNING "MTD device is absent on mtd_release!\n");`
96			`BLK_DEC_USE_COUNT;`
97			`release_return(-ENODEV);`
98			`}`
99
100			`if (mtd->sync)`
101			`mtd->sync(mtd);`
102
103			`put_mtd_device(mtd);`
104
105			`DEBUG(1, "ok\n");`
106
107			`BLK_DEC_USE_COUNT;`
108			`release_return(0);`
109			`}`
110
111
112			`static void mtdblock_request(RQFUNC_ARG)`
113			`{`
114			`struct request *current_request;`
115			`unsigned int res = 0;`
116			`struct mtd_info *mtd;`
117
118			`while (1)`
119			`{`
120			`/* Grab the Request and unlink it from the request list, INIT_REQUEST`
121			`will execute a return if we are done. */`
122			`INIT_REQUEST;`
123			`current_request = CURRENT;`
124
125			`if (MINOR(current_request->rq_dev) >= MAX_MTD_DEVICES)`
126			`{`
127			`printk("mtd: Unsupported device!\n");`
128			`end_request(0);`
129			`continue;`
130			`}`
131
132			`// Grab our MTD structure`
133
134			`mtd = __get_mtd_device(NULL, MINOR(current_request->rq_dev));`
135			`if (!mtd) {`
136			`printk("MTD device %d doesn't appear to exist any more\n", CURRENT_DEV);`
137			`end_request(0);`
138			`}`
139
140			`if (current_request->sector << 9 > mtd->size \|\|`
141			`(current_request->sector + current_request->current_nr_sectors) << 9 > mtd->size)`
142			`{`
143			`printk("mtd: Attempt to read past end of device!\n");`
144			`printk("size: %x, sector: %lx, nr_sectors %lx\n", mtd->size,`
145			`current_request->sector, current_request->current_nr_sectors);`
146			`end_request(0);`
147			`continue;`
148			`}`
149
150			`/* Remove the request we are handling from the request list so nobody messes`
151			`with it */`
152			`#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)`
153			`/* Now drop the lock that the ll_rw_blk functions grabbed for us`
154			`and process the request. This is necessary due to the extreme time`
155			`we spend processing it. */`
156			`spin_unlock_irq(&io_request_lock);`
157			`#endif`
158
159			`// Handle the request`
160			`switch (current_request->cmd)`
161			`{`
162			`size_t retlen;`
163
164			`case READ:`
165			`if (MTD_READ(mtd,current_request->sector<<9,`
166			`current_request->current_nr_sectors << 9,`
167			`&retlen, current_request->buffer) == 0)`
168			`res = 1;`
169			`else`
170			`res = 0;`
171			`break;`
172
173			`case WRITE:`
174
175			`/* printk("mtdblock_request WRITE sector=%d(%d)\n",current_request->sector,`
176			`current_request->current_nr_sectors);`
177			`*/`
178
179			`// Read only device`
180			`if ((mtd->flags & MTD_CAP_RAM) == 0)`
181			`{`
182			`res = 0;`
183			`break;`
184			`}`
185
186			`// Do the write`
187			`if (MTD_WRITE(mtd,current_request->sector<<9,`
188			`current_request->current_nr_sectors << 9,`
189			`&retlen, current_request->buffer) == 0)`
190			`res = 1;`
191			`else`
192			`res = 0;`
193			`break;`
194
195			`// Shouldn't happen`
196			`default:`
197			`printk("mtd: unknown request\n");`
198			`break;`
199			`}`
200
201			`// Grab the lock and re-thread the item onto the linked list`
202			`#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)`
203			`spin_lock_irq(&io_request_lock);`
204			`#endif`
205			`end_request(res);`
206			`}`
207			`}`
208
209
210
211			`static int mtdblock_ioctl(struct inode * inode, struct file * file,`
212			`unsigned int cmd, unsigned long arg)`
213			`{`
214			`struct mtd_info *mtd;`
215
216			`mtd = __get_mtd_device(NULL, MINOR(inode->i_rdev));`
217
218			`if (!mtd) return -EINVAL;`
219
220			`switch (cmd) {`
221			`case BLKGETSIZE: /* Return device size */`
222			`return put_user((mtd->size >> 9), (unsigned long *) arg);`
223
224			`#ifdef BLKGETSIZE64`
225			`case BLKGETSIZE64:`
226			`return put_user((u64)mtd->size, (u64 *)arg);`
227			`#endif`
228
229			`case BLKFLSBUF:`
230			`#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)`
231			`if(!capable(CAP_SYS_ADMIN)) return -EACCES;`
232			`#endif`
233			`fsync_dev(inode->i_rdev);`
234			`invalidate_buffers(inode->i_rdev);`
235			`if (mtd->sync)`
236			`mtd->sync(mtd);`
237			`return 0;`
238
239			`default:`
240			`return -ENOTTY;`
241			`}`
242			`}`
243
244			`#if LINUX_VERSION_CODE < 0x20326`
245			`static struct file_operations mtd_fops =`
246			`{`
247			`open: mtdblock_open,`
248			`ioctl: mtdblock_ioctl,`
249			`release: mtdblock_release,`
250			`read: block_read,`
251			`write: block_write`
252			`};`
253			`#else`
254			`static struct block_device_operations mtd_fops =`
255			`{`
256			`#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,14)`
257			`owner: THIS_MODULE,`
258			`#endif`
259			`open: mtdblock_open,`
260			`release: mtdblock_release,`
261			`ioctl: mtdblock_ioctl`
262			`};`
263			`#endif`
264
265			`int __init init_mtdblock(void)`
266			`{`
267			`int i;`
268
269			`if (register_blkdev(MAJOR_NR,DEVICE_NAME,&mtd_fops)) {`
270			`printk(KERN_NOTICE "Can't allocate major number %d for Memory Technology Devices.\n",`
271			`MTD_BLOCK_MAJOR);`
272			`return -EAGAIN;`
273			`}`
274
275			`/* We fill it in at open() time. */`
276			`for (i=0; i< MAX_MTD_DEVICES; i++) {`
277			`mtd_sizes[i] = 0;`
278			`}`
279
280			`/* Allow the block size to default to BLOCK_SIZE. */`
281			`blksize_size[MAJOR_NR] = NULL;`
282			`blk_size[MAJOR_NR] = mtd_sizes;`
283
284			`blk_init_queue(BLK_DEFAULT_QUEUE(MAJOR_NR), &mtdblock_request);`
285			`return 0;`
286			`}`
287
288			`static void __exit cleanup_mtdblock(void)`
289			`{`
290			`unregister_blkdev(MAJOR_NR,DEVICE_NAME);`
291			`blk_size[MAJOR_NR] = NULL;`
292			`blk_cleanup_queue(BLK_DEFAULT_QUEUE(MAJOR_NR));`
293			`}`
294
295			`module_init(init_mtdblock);`
296			`module_exit(cleanup_mtdblock);`
297
298
299			`MODULE_LICENSE("GPL");`
300			`MODULE_AUTHOR("Erwin Authried <eauth@softsys.co.at> et al.");`
301			`MODULE_DESCRIPTION("Simple read-only block device emulation access to MTD devices");`