[PATCH 30/31] block: store the holder in file->private_data

Christoph Hellwig
2023-06-06T07:46:29Z

Store the file struct used as the holder in file->private_data as an
indicator that this file descriptor was opened exclusively to remove
the last use of FMODE_EXCL.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
block/fops.c | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/block/fops.c b/block/fops.c
index c40b9f978e3bc7..915e0ef7560993 100644
--- a/block/fops.c
+++ b/block/fops.c
@@ -478,7 +478,7 @@ blk_mode_t file_to_blk_mode(struct file *file)
mode |= BLK_OPEN_READ;
if (file->f_mode & FMODE_WRITE)
mode |= BLK_OPEN_WRITE;
- if (file->f_mode & FMODE_EXCL)
+ if (file->private_data)
mode |= BLK_OPEN_EXCL;
if ((file->f_flags & O_ACCMODE) == 3)
mode |= BLK_OPEN_WRITE_IOCTL;
@@ -501,12 +501,15 @@ static int blkdev_open(struct inode *inode, struct file *filp)
filp->f_flags |= O_LARGEFILE;
filp->f_mode |= FMODE_NOWAIT | FMODE_BUF_RASYNC;

+ /*
+ * Use the file private data to store the holder, file_to_blk_mode
+ * relies on this.
+ */
if (filp->f_flags & O_EXCL)
- filp->f_mode |= FMODE_EXCL;
+ filp->private_data = filp;

bdev = blkdev_get_by_dev(inode->i_rdev, file_to_blk_mode(filp),
- (filp->f_mode & FMODE_EXCL) ? filp : NULL,
- NULL);
+ filp->private_data, NULL);
if (IS_ERR(bdev))
return PTR_ERR(bdev);

@@ -517,8 +520,7 @@ static int blkdev_open(struct inode *inode, struct file *filp)

static int blkdev_release(struct inode *inode, struct file *filp)
{
- blkdev_put(I_BDEV(filp->f_mapping->host),
- (filp->f_mode & FMODE_EXCL) ? filp : NULL);
+ blkdev_put(I_BDEV(filp->f_mapping->host), filp->private_data);
return 0;
}

--
2.39.2