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[/] [test_project/] [trunk/] [linux_sd_driver/] [block/] [ioctl.c] - Blame information for rev 78

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Line No. Rev Author Line
1 62 marcus.erl 
#include <linux/capability.h>
2 
#include <linux/blkdev.h>
3 
#include <linux/blkpg.h>
4 
#include <linux/hdreg.h>
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#include <linux/backing-dev.h>
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#include <linux/buffer_head.h>
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#include <linux/smp_lock.h>
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#include <linux/blktrace_api.h>
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#include <asm/uaccess.h>
10 
 
11 
static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user *arg)
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{
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        struct block_device *bdevp;
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        struct gendisk *disk;
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        struct blkpg_ioctl_arg a;
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        struct blkpg_partition p;
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        long long start, length;
18 
        int part;
19 
        int i;
20 
 
21 
        if (!capable(CAP_SYS_ADMIN))
22 
                return -EACCES;
23 
        if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg)))
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                return -EFAULT;
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        if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition)))
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                return -EFAULT;
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        disk = bdev->bd_disk;
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        if (bdev != bdev->bd_contains)
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                return -EINVAL;
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        part = p.pno;
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        if (part <= 0 || part >= disk->minors)
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                return -EINVAL;
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        switch (a.op) {
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                case BLKPG_ADD_PARTITION:
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                        start = p.start >> 9;
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                        length = p.length >> 9;
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                        /* check for fit in a hd_struct */
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                        if (sizeof(sector_t) == sizeof(long) &&
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                            sizeof(long long) > sizeof(long)) {
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                                long pstart = start, plength = length;
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                                if (pstart != start || plength != length
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                                    || pstart < 0 || plength < 0)
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                                        return -EINVAL;
44 
                        }
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                        /* partition number in use? */
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                        mutex_lock(&bdev->bd_mutex);
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                        if (disk->part[part - 1]) {
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                                mutex_unlock(&bdev->bd_mutex);
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                                return -EBUSY;
50 
                        }
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                        /* overlap? */
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                        for (i = 0; i < disk->minors - 1; i++) {
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                                struct hd_struct *s = disk->part[i];
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55 
                                if (!s)
56 
                                        continue;
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                                if (!(start+length <= s->start_sect ||
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                                      start >= s->start_sect + s->nr_sects)) {
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                                        mutex_unlock(&bdev->bd_mutex);
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                                        return -EBUSY;
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                                }
62 
                        }
63 
                        /* all seems OK */
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                        add_partition(disk, part, start, length, ADDPART_FLAG_NONE);
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                        mutex_unlock(&bdev->bd_mutex);
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                        return 0;
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                case BLKPG_DEL_PARTITION:
68 
                        if (!disk->part[part-1])
69 
                                return -ENXIO;
70 
                        if (disk->part[part - 1]->nr_sects == 0)
71 
                                return -ENXIO;
72 
                        bdevp = bdget_disk(disk, part);
73 
                        if (!bdevp)
74 
                                return -ENOMEM;
75 
                        mutex_lock(&bdevp->bd_mutex);
76 
                        if (bdevp->bd_openers) {
77 
                                mutex_unlock(&bdevp->bd_mutex);
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                                bdput(bdevp);
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                                return -EBUSY;
80 
                        }
81 
                        /* all seems OK */
82 
                        fsync_bdev(bdevp);
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                        invalidate_bdev(bdevp);
84 
 
85 
                        mutex_lock_nested(&bdev->bd_mutex, 1);
86 
                        delete_partition(disk, part);
87 
                        mutex_unlock(&bdev->bd_mutex);
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                        mutex_unlock(&bdevp->bd_mutex);
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                        bdput(bdevp);
90 
 
91 
                        return 0;
92 
                default:
93 
                        return -EINVAL;
94 
        }
95 
}
96 
 
97 
static int blkdev_reread_part(struct block_device *bdev)
98 
{
99 
        struct gendisk *disk = bdev->bd_disk;
100 
        int res;
101 
 
102 
        if (disk->minors == 1 || bdev != bdev->bd_contains)
103 
                return -EINVAL;
104 
        if (!capable(CAP_SYS_ADMIN))
105 
                return -EACCES;
106 
        if (!mutex_trylock(&bdev->bd_mutex))
107 
                return -EBUSY;
108 
        res = rescan_partitions(disk, bdev);
109 
        mutex_unlock(&bdev->bd_mutex);
110 
        return res;
111 
}
112 
 
113 
static int put_ushort(unsigned long arg, unsigned short val)
114 
{
115 
        return put_user(val, (unsigned short __user *)arg);
116 
}
117 
 
118 
static int put_int(unsigned long arg, int val)
119 
{
120 
        return put_user(val, (int __user *)arg);
121 
}
122 
 
123 
static int put_long(unsigned long arg, long val)
124 
{
125 
        return put_user(val, (long __user *)arg);
126 
}
127 
 
128 
static int put_ulong(unsigned long arg, unsigned long val)
129 
{
130 
        return put_user(val, (unsigned long __user *)arg);
131 
}
132 
 
133 
static int put_u64(unsigned long arg, u64 val)
134 
{
135 
        return put_user(val, (u64 __user *)arg);
136 
}
137 
 
138 
static int blkdev_locked_ioctl(struct file *file, struct block_device *bdev,
139 
                                unsigned cmd, unsigned long arg)
140 
{
141 
        struct backing_dev_info *bdi;
142 
        int ret, n;
143 
 
144 
        switch (cmd) {
145 
        case BLKRAGET:
146 
        case BLKFRAGET:
147 
                if (!arg)
148 
                        return -EINVAL;
149 
                bdi = blk_get_backing_dev_info(bdev);
150 
                if (bdi == NULL)
151 
                        return -ENOTTY;
152 
                return put_long(arg, (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
153 
        case BLKROGET:
154 
                return put_int(arg, bdev_read_only(bdev) != 0);
155 
        case BLKBSZGET: /* get the logical block size (cf. BLKSSZGET) */
156 
                return put_int(arg, block_size(bdev));
157 
        case BLKSSZGET: /* get block device hardware sector size */
158 
                return put_int(arg, bdev_hardsect_size(bdev));
159 
        case BLKSECTGET:
160 
                return put_ushort(arg, bdev_get_queue(bdev)->max_sectors);
161 
        case BLKRASET:
162 
        case BLKFRASET:
163 
                if(!capable(CAP_SYS_ADMIN))
164 
                        return -EACCES;
165 
                bdi = blk_get_backing_dev_info(bdev);
166 
                if (bdi == NULL)
167 
                        return -ENOTTY;
168 
                bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
169 
                return 0;
170 
        case BLKBSZSET:
171 
                /* set the logical block size */
172 
                if (!capable(CAP_SYS_ADMIN))
173 
                        return -EACCES;
174 
                if (!arg)
175 
                        return -EINVAL;
176 
                if (get_user(n, (int __user *) arg))
177 
                        return -EFAULT;
178 
                if (bd_claim(bdev, file) < 0)
179 
                        return -EBUSY;
180 
                ret = set_blocksize(bdev, n);
181 
                bd_release(bdev);
182 
                return ret;
183 
        case BLKPG:
184 
                return blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg);
185 
        case BLKRRPART:
186 
                return blkdev_reread_part(bdev);
187 
        case BLKGETSIZE:
188 
                if ((bdev->bd_inode->i_size >> 9) > ~0UL)
189 
                        return -EFBIG;
190 
                return put_ulong(arg, bdev->bd_inode->i_size >> 9);
191 
        case BLKGETSIZE64:
192 
                return put_u64(arg, bdev->bd_inode->i_size);
193 
        case BLKTRACESTART:
194 
        case BLKTRACESTOP:
195 
        case BLKTRACESETUP:
196 
        case BLKTRACETEARDOWN:
197 
                return blk_trace_ioctl(bdev, cmd, (char __user *) arg);
198 
        }
199 
        return -ENOIOCTLCMD;
200 
}
201 
 
202 
int blkdev_driver_ioctl(struct inode *inode, struct file *file,
203 
                        struct gendisk *disk, unsigned cmd, unsigned long arg)
204 
{
205 
        int ret;
206 
        if (disk->fops->unlocked_ioctl)
207 
                return disk->fops->unlocked_ioctl(file, cmd, arg);
208 
 
209 
        if (disk->fops->ioctl) {
210 
                lock_kernel();
211 
                ret = disk->fops->ioctl(inode, file, cmd, arg);
212 
                unlock_kernel();
213 
                return ret;
214 
        }
215 
 
216 
        return -ENOTTY;
217 
}
218 
EXPORT_SYMBOL_GPL(blkdev_driver_ioctl);
219 
 
220 
/*
221 
 * always keep this in sync with compat_blkdev_ioctl() and
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 * compat_blkdev_locked_ioctl()
223 
 */
224 
int blkdev_ioctl(struct inode *inode, struct file *file, unsigned cmd,
225 
                        unsigned long arg)
226 
{
227 
        struct block_device *bdev = inode->i_bdev;
228 
        struct gendisk *disk = bdev->bd_disk;
229 
        int ret, n;
230 
 
231 
        switch(cmd) {
232 
        case BLKFLSBUF:
233 
                if (!capable(CAP_SYS_ADMIN))
234 
                        return -EACCES;
235 
 
236 
                ret = blkdev_driver_ioctl(inode, file, disk, cmd, arg);
237 
                /* -EINVAL to handle old uncorrected drivers */
238 
                if (ret != -EINVAL && ret != -ENOTTY)
239 
                        return ret;
240 
 
241 
                lock_kernel();
242 
                fsync_bdev(bdev);
243 
                invalidate_bdev(bdev);
244 
                unlock_kernel();
245 
                return 0;
246 
 
247 
        case BLKROSET:
248 
                ret = blkdev_driver_ioctl(inode, file, disk, cmd, arg);
249 
                /* -EINVAL to handle old uncorrected drivers */
250 
                if (ret != -EINVAL && ret != -ENOTTY)
251 
                        return ret;
252 
                if (!capable(CAP_SYS_ADMIN))
253 
                        return -EACCES;
254 
                if (get_user(n, (int __user *)(arg)))
255 
                        return -EFAULT;
256 
                lock_kernel();
257 
                set_device_ro(bdev, n);
258 
                unlock_kernel();
259 
                return 0;
260 
        case HDIO_GETGEO: {
261 
                struct hd_geometry geo;
262 
 
263 
                if (!arg)
264 
                        return -EINVAL;
265 
                if (!disk->fops->getgeo)
266 
                        return -ENOTTY;
267 
 
268 
                /*
269 
                 * We need to set the startsect first, the driver may
270 
                 * want to override it.
271 
                 */
272 
                geo.start = get_start_sect(bdev);
273 
                ret = disk->fops->getgeo(bdev, &geo);
274 
                if (ret)
275 
                        return ret;
276 
                if (copy_to_user((struct hd_geometry __user *)arg, &geo,
277 
                                        sizeof(geo)))
278 
                        return -EFAULT;
279 
                return 0;
280 
        }
281 
        }
282 
 
283 
        lock_kernel();
284 
        ret = blkdev_locked_ioctl(file, bdev, cmd, arg);
285 
        unlock_kernel();
286 
        if (ret != -ENOIOCTLCMD)
287 
                return ret;
288 
 
289 
        return blkdev_driver_ioctl(inode, file, disk, cmd, arg);
290 
}
291 
EXPORT_SYMBOL_GPL(blkdev_ioctl);

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