ia64/linux-2.6.18-xen.hg

view block/ioctl.c @ 890:2e94884f0e8d

Dom0 PCI: fix a regression introduced by the SR-IOV change

The device class may be changed during the early fixup. So need to
re-read the device class from pci_dev after the fixup.

The patch "PCI: centralize device setup code" (c/s 825) wrongly
cleaned up the device class re-read. This patch reverts that change.

Signed-off-by: Yu Zhao <yu.zhao@intel.com>
author Keir Fraser <keir.fraser@citrix.com>
date Wed Jun 03 11:21:52 2009 +0100 (2009-06-03)
parents 831230e53067
children
line source
1 #include <linux/capability.h>
2 #include <linux/blkdev.h>
3 #include <linux/blkpg.h>
4 #include <linux/hdreg.h>
5 #include <linux/backing-dev.h>
6 #include <linux/buffer_head.h>
7 #include <linux/smp_lock.h>
8 #include <linux/blktrace_api.h>
9 #include <asm/uaccess.h>
11 static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user *arg)
12 {
13 struct block_device *bdevp;
14 struct gendisk *disk;
15 struct blkpg_ioctl_arg a;
16 struct blkpg_partition p;
17 long long start, length;
18 int part;
19 int i;
21 if (!capable(CAP_SYS_ADMIN))
22 return -EACCES;
23 if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg)))
24 return -EFAULT;
25 if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition)))
26 return -EFAULT;
27 disk = bdev->bd_disk;
28 if (bdev != bdev->bd_contains)
29 return -EINVAL;
30 part = p.pno;
31 if (part <= 0 || part >= disk->minors)
32 return -EINVAL;
33 switch (a.op) {
34 case BLKPG_ADD_PARTITION:
35 start = p.start >> 9;
36 length = p.length >> 9;
37 /* check for fit in a hd_struct */
38 if (sizeof(sector_t) == sizeof(long) &&
39 sizeof(long long) > sizeof(long)) {
40 long pstart = start, plength = length;
41 if (pstart != start || plength != length
42 || pstart < 0 || plength < 0)
43 return -EINVAL;
44 }
45 /* partition number in use? */
46 mutex_lock(&bdev->bd_mutex);
47 if (disk->part[part - 1]) {
48 mutex_unlock(&bdev->bd_mutex);
49 return -EBUSY;
50 }
51 /* overlap? */
52 for (i = 0; i < disk->minors - 1; i++) {
53 struct hd_struct *s = disk->part[i];
55 if (!s)
56 continue;
57 if (!(start+length <= s->start_sect ||
58 start >= s->start_sect + s->nr_sects)) {
59 mutex_unlock(&bdev->bd_mutex);
60 return -EBUSY;
61 }
62 }
63 /* all seems OK */
64 add_partition(disk, part, start, length);
65 mutex_unlock(&bdev->bd_mutex);
66 return 0;
67 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_nested(&bdevp->bd_mutex, BD_MUTEX_PARTITION);
76 if (bdevp->bd_openers) {
77 mutex_unlock(&bdevp->bd_mutex);
78 bdput(bdevp);
79 return -EBUSY;
80 }
81 /* all seems OK */
82 fsync_bdev(bdevp);
83 invalidate_bdev(bdevp, 0);
85 mutex_lock_nested(&bdev->bd_mutex, BD_MUTEX_WHOLE);
86 delete_partition(disk, part);
87 mutex_unlock(&bdev->bd_mutex);
88 mutex_unlock(&bdevp->bd_mutex);
89 bdput(bdevp);
91 return 0;
92 default:
93 return -EINVAL;
94 }
95 }
97 static int blkdev_reread_part(struct block_device *bdev)
98 {
99 struct gendisk *disk = bdev->bd_disk;
100 int res;
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 }
113 static int put_ushort(unsigned long arg, unsigned short val)
114 {
115 return put_user(val, (unsigned short __user *)arg);
116 }
118 static int put_int(unsigned long arg, int val)
119 {
120 return put_user(val, (int __user *)arg);
121 }
123 static int put_long(unsigned long arg, long val)
124 {
125 return put_user(val, (long __user *)arg);
126 }
128 static int put_ulong(unsigned long arg, unsigned long val)
129 {
130 return put_user(val, (unsigned long __user *)arg);
131 }
133 static int put_u64(unsigned long arg, u64 val)
134 {
135 return put_user(val, (u64 __user *)arg);
136 }
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;
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 }
202 static 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);
209 if (disk->fops->ioctl) {
210 lock_kernel();
211 ret = disk->fops->ioctl(inode, file, cmd, arg);
212 unlock_kernel();
213 return ret;
214 }
216 return -ENOTTY;
217 }
219 int blkdev_ioctl(struct inode *inode, struct file *file, unsigned cmd,
220 unsigned long arg)
221 {
222 struct block_device *bdev = inode->i_bdev;
223 struct gendisk *disk = bdev->bd_disk;
224 int ret, n;
226 switch(cmd) {
227 case BLKFLSBUF:
228 if (!capable(CAP_SYS_ADMIN))
229 return -EACCES;
231 ret = blkdev_driver_ioctl(inode, file, disk, cmd, arg);
232 /* -EINVAL to handle old uncorrected drivers */
233 if (ret != -EINVAL && ret != -ENOTTY)
234 return ret;
236 lock_kernel();
237 fsync_bdev(bdev);
238 invalidate_bdev(bdev, 0);
239 unlock_kernel();
240 return 0;
242 case BLKROSET:
243 ret = blkdev_driver_ioctl(inode, file, disk, cmd, arg);
244 /* -EINVAL to handle old uncorrected drivers */
245 if (ret != -EINVAL && ret != -ENOTTY)
246 return ret;
247 if (!capable(CAP_SYS_ADMIN))
248 return -EACCES;
249 if (get_user(n, (int __user *)(arg)))
250 return -EFAULT;
251 lock_kernel();
252 set_device_ro(bdev, n);
253 unlock_kernel();
254 return 0;
255 case HDIO_GETGEO: {
256 struct hd_geometry geo;
258 if (!arg)
259 return -EINVAL;
260 if (!disk->fops->getgeo)
261 return -ENOTTY;
263 /*
264 * We need to set the startsect first, the driver may
265 * want to override it.
266 */
267 geo.start = get_start_sect(bdev);
268 ret = disk->fops->getgeo(bdev, &geo);
269 if (ret)
270 return ret;
271 if (copy_to_user((struct hd_geometry __user *)arg, &geo,
272 sizeof(geo)))
273 return -EFAULT;
274 return 0;
275 }
276 }
278 lock_kernel();
279 ret = blkdev_locked_ioctl(file, bdev, cmd, arg);
280 unlock_kernel();
281 if (ret != -ENOIOCTLCMD)
282 return ret;
284 return blkdev_driver_ioctl(inode, file, disk, cmd, arg);
285 }
287 /* Most of the generic ioctls are handled in the normal fallback path.
288 This assumes the blkdev's low level compat_ioctl always returns
289 ENOIOCTLCMD for unknown ioctls. */
290 long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
291 {
292 struct block_device *bdev = file->f_dentry->d_inode->i_bdev;
293 struct gendisk *disk = bdev->bd_disk;
294 int ret = -ENOIOCTLCMD;
295 if (disk->fops->compat_ioctl) {
296 lock_kernel();
297 ret = disk->fops->compat_ioctl(file, cmd, arg);
298 unlock_kernel();
299 }
300 return ret;
301 }
303 EXPORT_SYMBOL_GPL(blkdev_ioctl);