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new helper: ihold()

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Clones an existing reference to inode; caller must already hold one.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2010-10-23 11:11:40 -04:00
parent 646ec4615c
commit 7de9c6ee3e
40 changed files with 57 additions and 49 deletions
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8
fs/block_dev.c
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@ -550,7 +550,7 @@ EXPORT_SYMBOL(bdget);
*/
struct block_device *bdgrab(struct block_device *bdev)
{
atomic_inc(&bdev->bd_inode->i_count);
ihold(bdev->bd_inode);
return bdev;
}
@ -580,7 +580,7 @@ static struct block_device *bd_acquire(struct inode *inode)
spin_lock(&bdev_lock);
bdev = inode->i_bdev;
if (bdev) {
atomic_inc(&bdev->bd_inode->i_count);
ihold(bdev->bd_inode);
spin_unlock(&bdev_lock);
return bdev;
}
@ -591,12 +591,12 @@ static struct block_device *bd_acquire(struct inode *inode)
spin_lock(&bdev_lock);
if (!inode->i_bdev) {
/*
* We take an additional bd_inode->i_count for inode,
* We take an additional reference to bd_inode,
* and it's released in clear_inode() of inode.
* So, we can access it via ->i_mapping always
* without igrab().
*/
atomic_inc(&bdev->bd_inode->i_count);
ihold(bdev->bd_inode);
inode->i_bdev = bdev;
inode->i_mapping = bdev->bd_inode->i_mapping;
list_add(&inode->i_devices, &bdev->bd_inodes);