NFC: Close a race condition in llcp_sock_getname()

[karo-tx-linux.git] / fs / block_dev.c

diff --git a/fs/block_dev.c b/fs/block_dev.c
index 530145b607c4a9c8ec99515ef68d4788f36ea245..afb43748436201e29343a923077976d01a2344fd 100644 (file)
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -75,7 +75,7 @@ void kill_bdev(struct block_device *bdev)
 {
        struct address_space *mapping = bdev->bd_inode->i_mapping;
 
-       if (mapping->nrpages == 0 && mapping->nrshadows == 0)
+       if (mapping->nrpages == 0 && mapping->nrexceptional == 0)
                return;
 
        invalidate_bh_lrus();
@@ -346,9 +346,9 @@ static loff_t block_llseek(struct file *file, loff_t offset, int whence)
        struct inode *bd_inode = bdev_file_inode(file);
        loff_t retval;
 
-       mutex_lock(&bd_inode->i_mutex);
+       inode_lock(bd_inode);
        retval = fixed_size_llseek(file, offset, whence, i_size_read(bd_inode));
-       mutex_unlock(&bd_inode->i_mutex);
+       inode_unlock(bd_inode);
        return retval;
 }
        
@@ -400,7 +400,7 @@ int bdev_read_page(struct block_device *bdev, sector_t sector,
        if (!ops->rw_page || bdev_get_integrity(bdev))
                return result;
 
-       result = blk_queue_enter(bdev->bd_queue, GFP_KERNEL);
+       result = blk_queue_enter(bdev->bd_queue, false);
        if (result)
                return result;
        result = ops->rw_page(bdev, sector + get_start_sect(bdev), page, READ);
@@ -437,7 +437,7 @@ int bdev_write_page(struct block_device *bdev, sector_t sector,
 
        if (!ops->rw_page || bdev_get_integrity(bdev))
                return -EOPNOTSUPP;
-       result = blk_queue_enter(bdev->bd_queue, GFP_NOIO);
+       result = blk_queue_enter(bdev->bd_queue, false);
        if (result)
                return result;
 
@@ -700,7 +700,7 @@ static struct block_device *bd_acquire(struct inode *inode)
        spin_lock(&bdev_lock);
        bdev = inode->i_bdev;
        if (bdev) {
-               ihold(bdev->bd_inode);
+               bdgrab(bdev);
                spin_unlock(&bdev_lock);
                return bdev;
        }
@@ -716,7 +716,7 @@ static struct block_device *bd_acquire(struct inode *inode)
                         * So, we can access it via ->i_mapping always
                         * without igrab().
                         */
-                       ihold(bdev->bd_inode);
+                       bdgrab(bdev);
                        inode->i_bdev = bdev;
                        inode->i_mapping = bdev->bd_inode->i_mapping;
                        list_add(&inode->i_devices, &bdev->bd_inodes);
@@ -739,7 +739,7 @@ void bd_forget(struct inode *inode)
        spin_unlock(&bdev_lock);
 
        if (bdev)
-               iput(bdev->bd_inode);
+               bdput(bdev);
 }
 
 /**
@@ -1142,9 +1142,9 @@ void bd_set_size(struct block_device *bdev, loff_t size)
 {
        unsigned bsize = bdev_logical_block_size(bdev);
 
-       mutex_lock(&bdev->bd_inode->i_mutex);
+       inode_lock(bdev->bd_inode);
        i_size_write(bdev->bd_inode, size);
-       mutex_unlock(&bdev->bd_inode->i_mutex);
+       inode_unlock(bdev->bd_inode);
        while (bsize < PAGE_CACHE_SIZE) {
                if (size & bsize)
                        break;
@@ -1736,37 +1736,13 @@ static int blkdev_dax_pmd_fault(struct vm_area_struct *vma, unsigned long addr,
        return __dax_pmd_fault(vma, addr, pmd, flags, blkdev_get_block, NULL);
 }
 
-static void blkdev_vm_open(struct vm_area_struct *vma)
-{
-       struct inode *bd_inode = bdev_file_inode(vma->vm_file);
-       struct block_device *bdev = I_BDEV(bd_inode);
-
-       mutex_lock(&bd_inode->i_mutex);
-       bdev->bd_map_count++;
-       mutex_unlock(&bd_inode->i_mutex);
-}
-
-static void blkdev_vm_close(struct vm_area_struct *vma)
-{
-       struct inode *bd_inode = bdev_file_inode(vma->vm_file);
-       struct block_device *bdev = I_BDEV(bd_inode);
-
-       mutex_lock(&bd_inode->i_mutex);
-       bdev->bd_map_count--;
-       mutex_unlock(&bd_inode->i_mutex);
-}
-
 static const struct vm_operations_struct blkdev_dax_vm_ops = {
-       .open           = blkdev_vm_open,
-       .close          = blkdev_vm_close,
        .fault          = blkdev_dax_fault,
        .pmd_fault      = blkdev_dax_pmd_fault,
        .pfn_mkwrite    = blkdev_dax_fault,
 };
 
 static const struct vm_operations_struct blkdev_default_vm_ops = {
-       .open           = blkdev_vm_open,
-       .close          = blkdev_vm_close,
        .fault          = filemap_fault,
        .map_pages      = filemap_map_pages,
 };
@@ -1774,18 +1750,14 @@ static const struct vm_operations_struct blkdev_default_vm_ops = {
 static int blkdev_mmap(struct file *file, struct vm_area_struct *vma)
 {
        struct inode *bd_inode = bdev_file_inode(file);
-       struct block_device *bdev = I_BDEV(bd_inode);
 
        file_accessed(file);
-       mutex_lock(&bd_inode->i_mutex);
-       bdev->bd_map_count++;
        if (IS_DAX(bd_inode)) {
                vma->vm_ops = &blkdev_dax_vm_ops;
                vma->vm_flags |= VM_MIXEDMAP | VM_HUGEPAGE;
        } else {
                vma->vm_ops = &blkdev_default_vm_ops;
        }
-       mutex_unlock(&bd_inode->i_mutex);
 
        return 0;
 }