nfs: new subdir Documentation/filesystems/nfs

[safe/jmp/linux-2.6] / block / ioctl.c

diff --git a/block/ioctl.c b/block/ioctl.c
index bd214cb..1f4d1de 100644 (file)
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -18,7 +18,6 @@ static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user
        struct disk_part_iter piter;
        long long start, length;
        int partno;
-       int err;
 
        if (!capable(CAP_SYS_ADMIN))
                return -EACCES;
@@ -61,10 +60,10 @@ static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user
                        disk_part_iter_exit(&piter);
 
                        /* all seems OK */
-                       err = add_partition(disk, partno, start, length,
-                                           ADDPART_FLAG_NONE);
+                       part = add_partition(disk, partno, start, length,
+                                            ADDPART_FLAG_NONE);
                        mutex_unlock(&bdev->bd_mutex);
-                       return err;
+                       return IS_ERR(part) ? PTR_ERR(part) : 0;
                case BLKPG_DEL_PARTITION:
                        part = disk_get_part(disk, partno);
                        if (!part)
@@ -113,22 +112,9 @@ static int blkdev_reread_part(struct block_device *bdev)
        return res;
 }
 
-static void blk_ioc_discard_endio(struct bio *bio, int err)
-{
-       if (err) {
-               if (err == -EOPNOTSUPP)
-                       set_bit(BIO_EOPNOTSUPP, &bio->bi_flags);
-               clear_bit(BIO_UPTODATE, &bio->bi_flags);
-       }
-       complete(bio->bi_private);
-}
-
 static int blk_ioctl_discard(struct block_device *bdev, uint64_t start,
                             uint64_t len)
 {
-       struct request_queue *q = bdev_get_queue(bdev);
-       int ret = 0;
-
        if (start & 511)
                return -EINVAL;
        if (len & 511)
@@ -138,42 +124,8 @@ static int blk_ioctl_discard(struct block_device *bdev, uint64_t start,
 
        if (start + len > (bdev->bd_inode->i_size >> 9))
                return -EINVAL;
-
-       if (!q->prepare_discard_fn)
-               return -EOPNOTSUPP;
-
-       while (len && !ret) {
-               DECLARE_COMPLETION_ONSTACK(wait);
-               struct bio *bio;
-
-               bio = bio_alloc(GFP_KERNEL, 0);
-               if (!bio)
-                       return -ENOMEM;
-
-               bio->bi_end_io = blk_ioc_discard_endio;
-               bio->bi_bdev = bdev;
-               bio->bi_private = &wait;
-               bio->bi_sector = start;
-
-               if (len > q->max_hw_sectors) {
-                       bio->bi_size = q->max_hw_sectors << 9;
-                       len -= q->max_hw_sectors;
-                       start += q->max_hw_sectors;
-               } else {
-                       bio->bi_size = len << 9;
-                       len = 0;
-               }
-               submit_bio(DISCARD_NOBARRIER, bio);
-
-               wait_for_completion(&wait);
-
-               if (bio_flagged(bio, BIO_EOPNOTSUPP))
-                       ret = -EOPNOTSUPP;
-               else if (!bio_flagged(bio, BIO_UPTODATE))
-                       ret = -EIO;
-               bio_put(bio);
-       }
-       return ret;
+       return blkdev_issue_discard(bdev, start, len, GFP_KERNEL,
+                                   DISCARD_FL_WAIT);
 }
 
 static int put_ushort(unsigned long arg, unsigned short val)
@@ -186,6 +138,11 @@ static int put_int(unsigned long arg, int val)
        return put_user(val, (int __user *)arg);
 }
 
+static int put_uint(unsigned long arg, unsigned int val)
+{
+       return put_user(val, (unsigned int __user *)arg);
+}
+
 static int put_long(unsigned long arg, long val)
 {
        return put_user(val, (long __user *)arg);
@@ -230,20 +187,13 @@ EXPORT_SYMBOL_GPL(__blkdev_driver_ioctl);
  * always keep this in sync with compat_blkdev_ioctl() and
  * compat_blkdev_locked_ioctl()
  */
-int blkdev_ioctl(struct inode *inode, struct file *file, unsigned cmd,
+int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
                        unsigned long arg)
 {
-       struct block_device *bdev = inode->i_bdev;
        struct gendisk *disk = bdev->bd_disk;
        struct backing_dev_info *bdi;
        loff_t size;
        int ret, n;
-       fmode_t mode = 0;
-       if (file) {
-               mode = file->f_mode;
-               if (file->f_flags & O_NDELAY)
-                       mode |= FMODE_NDELAY_NOW;
-       }
 
        switch(cmd) {
        case BLKFLSBUF:
@@ -318,12 +268,20 @@ int blkdev_ioctl(struct inode *inode, struct file *file, unsigned cmd,
                return put_long(arg, (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
        case BLKROGET:
                return put_int(arg, bdev_read_only(bdev) != 0);
-       case BLKBSZGET: /* get the logical block size (cf. BLKSSZGET) */
+       case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
                return put_int(arg, block_size(bdev));
-       case BLKSSZGET: /* get block device hardware sector size */
-               return put_int(arg, bdev_hardsect_size(bdev));
+       case BLKSSZGET: /* get block device logical block size */
+               return put_int(arg, bdev_logical_block_size(bdev));
+       case BLKPBSZGET: /* get block device physical block size */
+               return put_uint(arg, bdev_physical_block_size(bdev));
+       case BLKIOMIN:
+               return put_uint(arg, bdev_io_min(bdev));
+       case BLKIOOPT:
+               return put_uint(arg, bdev_io_opt(bdev));
+       case BLKALIGNOFF:
+               return put_int(arg, bdev_alignment_offset(bdev));
        case BLKSECTGET:
-               return put_ushort(arg, bdev_get_queue(bdev)->max_sectors);
+               return put_ushort(arg, queue_max_sectors(bdev_get_queue(bdev)));
        case BLKRASET:
        case BLKFRASET:
                if(!capable(CAP_SYS_ADMIN))
@@ -331,9 +289,7 @@ int blkdev_ioctl(struct inode *inode, struct file *file, unsigned cmd,
                bdi = blk_get_backing_dev_info(bdev);
                if (bdi == NULL)
                        return -ENOTTY;
-               lock_kernel();
                bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
-               unlock_kernel();
                return 0;
        case BLKBSZSET:
                /* set the logical block size */
@@ -343,10 +299,11 @@ int blkdev_ioctl(struct inode *inode, struct file *file, unsigned cmd,
                        return -EINVAL;
                if (get_user(n, (int __user *) arg))
                        return -EFAULT;
-               if (bd_claim(bdev, file) < 0)
+               if (!(mode & FMODE_EXCL) && bd_claim(bdev, &bdev) < 0)
                        return -EBUSY;
                ret = set_blocksize(bdev, n);
-               bd_release(bdev);
+               if (!(mode & FMODE_EXCL))
+                       bd_release(bdev);
                return ret;
        case BLKPG:
                lock_kernel();