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| author | Jeff Garzik <jeff@garzik.org> | 2006-06-22 22:51:46 -0400 |
|---|---|---|
| committer | Jeff Garzik <jeff@garzik.org> | 2006-06-22 22:51:46 -0400 |
| commit | dbe1ab9514c231c9b062140a107d9dea0eabefcc (patch) | |
| tree | 0001c7143cf923fc704215f0a0e54221e9e5cbb9 /fs/block_dev.c | |
| parent | 612eff0e3715a6faff5ba1b74873b99e036c59fe (diff) | |
| parent | d588fcbe5a7ba8bba2cebf7799ab2d573717a806 (diff) | |
| download | op-kernel-dev-dbe1ab9514c231c9b062140a107d9dea0eabefcc.zip op-kernel-dev-dbe1ab9514c231c9b062140a107d9dea0eabefcc.tar.gz | |
Merge branch 'master' into upstream
Diffstat (limited to 'fs/block_dev.c')
| -rw-r--r-- | fs/block_dev.c | 32 |
1 files changed, 25 insertions, 7 deletions
diff --git a/fs/block_dev.c b/fs/block_dev.c index f5958f4..44aaba2 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -414,21 +414,31 @@ EXPORT_SYMBOL(bdput); static struct block_device *bd_acquire(struct inode *inode) { struct block_device *bdev; + spin_lock(&bdev_lock); bdev = inode->i_bdev; - if (bdev && igrab(bdev->bd_inode)) { + if (bdev) { + atomic_inc(&bdev->bd_inode->i_count); spin_unlock(&bdev_lock); return bdev; } spin_unlock(&bdev_lock); + bdev = bdget(inode->i_rdev); if (bdev) { spin_lock(&bdev_lock); - if (inode->i_bdev) - __bd_forget(inode); - inode->i_bdev = bdev; - inode->i_mapping = bdev->bd_inode->i_mapping; - list_add(&inode->i_devices, &bdev->bd_inodes); + if (!inode->i_bdev) { + /* + * We take an additional bd_inode->i_count for 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); + inode->i_bdev = bdev; + inode->i_mapping = bdev->bd_inode->i_mapping; + list_add(&inode->i_devices, &bdev->bd_inodes); + } spin_unlock(&bdev_lock); } return bdev; @@ -438,10 +448,18 @@ static struct block_device *bd_acquire(struct inode *inode) void bd_forget(struct inode *inode) { + struct block_device *bdev = NULL; + spin_lock(&bdev_lock); - if (inode->i_bdev) + if (inode->i_bdev) { + if (inode->i_sb != blockdev_superblock) + bdev = inode->i_bdev; __bd_forget(inode); + } spin_unlock(&bdev_lock); + + if (bdev) + iput(bdev->bd_inode); } int bd_claim(struct block_device *bdev, void *holder) |
