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block: store the holder in file->private_data

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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>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Link: https://lore.kernel.org/r/20230608110258.189493-30-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig
2023-06-08 13:02:57 +02:00
committed by Jens Axboe
parent 4e762d8623
commit ee3249a8ce
1 changed files with 8 additions and 6 deletions
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14
block/fops.c
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@@ -478,7 +478,7 @@ blk_mode_t file_to_blk_mode(struct file *file)
mode |= BLK_OPEN_READ; mode |= BLK_OPEN_READ;
if (file->f_mode & FMODE_WRITE) if (file->f_mode & FMODE_WRITE)
mode |= BLK_OPEN_WRITE; mode |= BLK_OPEN_WRITE;
if (file->f_mode & FMODE_EXCL) if (file->private_data)
mode |= BLK_OPEN_EXCL; mode |= BLK_OPEN_EXCL;
if (file->f_flags & O_NDELAY) if (file->f_flags & O_NDELAY)
mode |= BLK_OPEN_NDELAY; mode |= BLK_OPEN_NDELAY;
@@ -507,12 +507,15 @@ static int blkdev_open(struct inode *inode, struct file *filp)
filp->f_flags |= O_LARGEFILE; filp->f_flags |= O_LARGEFILE;
filp->f_mode |= FMODE_NOWAIT | FMODE_BUF_RASYNC; filp->f_mode |= FMODE_NOWAIT | FMODE_BUF_RASYNC;
/*
* Use the file private data to store the holder for exclusive openes.
* file_to_blk_mode relies on it being present to set BLK_OPEN_EXCL.
*/
if (filp->f_flags & O_EXCL) 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), bdev = blkdev_get_by_dev(inode->i_rdev, file_to_blk_mode(filp),
(filp->f_mode & FMODE_EXCL) ? filp : NULL, filp->private_data, NULL);
NULL);
if (IS_ERR(bdev)) if (IS_ERR(bdev))
return PTR_ERR(bdev); return PTR_ERR(bdev);
@@ -523,8 +526,7 @@ static int blkdev_open(struct inode *inode, struct file *filp)
static int blkdev_release(struct inode *inode, struct file *filp) static int blkdev_release(struct inode *inode, struct file *filp)
{ {
blkdev_put(I_BDEV(filp->f_mapping->host), blkdev_put(I_BDEV(filp->f_mapping->host), filp->private_data);
(filp->f_mode & FMODE_EXCL) ? filp : NULL);
return 0; return 0;
} }