... eliminating the need to reopen block devices so they could be
exclusively held.
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Christian Brauner <brauner@xxxxxxxxxx>
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
---
include/linux/swap.h | 1 -
mm/swapfile.c | 19 ++-----------------
2 files changed, 2 insertions(+), 18 deletions(-)
diff --git a/include/linux/swap.h b/include/linux/swap.h
index a5b640cca459..7e61a4aef2fc 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -298,7 +298,6 @@ struct swap_info_struct {
unsigned int __percpu *cluster_next_cpu; /*percpu index for next allocation */
struct percpu_cluster __percpu *percpu_cluster; /* per cpu's swap location */
struct rb_root swap_extent_root;/* root of the swap extent rbtree */
- struct file *bdev_file; /* open handle of the bdev */
struct block_device *bdev; /* swap device or bdev of swap file */
struct file *swap_file; /* seldom referenced */
struct completion comp; /* seldom referenced */
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 304f74d039f3..7bba0b0d4924 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -2550,10 +2550,6 @@ SYSCALL_DEFINE1(swapoff, const char __user *, specialfile)
exit_swap_address_space(p->type);
inode = mapping->host;
- if (p->bdev_file) {
- fput(p->bdev_file);
- p->bdev_file = NULL;
- }
inode_lock(inode);
inode->i_flags &= ~S_SWAPFILE;
@@ -2780,14 +2776,7 @@ static struct swap_info_struct *alloc_swap_info(void)
static int claim_swapfile(struct swap_info_struct *p, struct inode *inode)
{
if (S_ISBLK(inode->i_mode)) {
- p->bdev_file = bdev_file_open_by_dev(inode->i_rdev,
- BLK_OPEN_READ | BLK_OPEN_WRITE, p, NULL);
- if (IS_ERR(p->bdev_file)) {
- int error = PTR_ERR(p->bdev_file);
- p->bdev_file = NULL;
- return error;
- }
- p->bdev = file_bdev(p->bdev_file);
+ p->bdev = I_BDEV(inode);
/*
* Zoned block devices contain zones that have a sequential
* write only restriction. Hence zoned block devices are not
@@ -3028,7 +3017,7 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
name = NULL;
goto bad_swap;
}
- swap_file = file_open_name(name, O_RDWR|O_LARGEFILE, 0);
+ swap_file = file_open_name(name, O_RDWR | O_LARGEFILE | O_EXCL, 0);
if (IS_ERR(swap_file)) {
error = PTR_ERR(swap_file);
swap_file = NULL;
@@ -3225,10 +3214,6 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
p->percpu_cluster = NULL;
free_percpu(p->cluster_next_cpu);
p->cluster_next_cpu = NULL;
- if (p->bdev_file) {
- fput(p->bdev_file);
- p->bdev_file = NULL;
- }
inode = NULL;
destroy_swap_extents(p);
swap_cgroup_swapoff(p->type);
--
2.39.2
