diff options
| author | Christoph Hellwig <hch@lst.de> | 2020-09-21 09:19:56 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-09-23 18:43:19 +0200 |
| commit | 21bd900572f3708e281ea25f051fc92462eb1193 (patch) | |
| tree | 6a35266ebc9c5c5c49d7245861a80f391900934c /kernel/power/user.c | |
| parent | PM: rewrite is_hibernate_resume_dev to not require an inode (diff) | |
| download | linux-21bd900572f3708e281ea25f051fc92462eb1193.tar.xz linux-21bd900572f3708e281ea25f051fc92462eb1193.zip | |
mm: split swap_type_of
swap_type_of is used for two entirely different purposes:
(1) check what swap type a given device/offset corresponds to
(2) find the first available swap device that can be written to
Mixing both in a single function creates an unreadable mess. Create two
separate functions instead, and switch both to pass a dev_t instead of
a struct block_device to further simplify the code.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'kernel/power/user.c')
| -rw-r--r-- | kernel/power/user.c | 16 |
1 files changed, 4 insertions, 12 deletions
diff --git a/kernel/power/user.c b/kernel/power/user.c index b5815685b944..6510a8f7687f 100644 --- a/kernel/power/user.c +++ b/kernel/power/user.c @@ -69,8 +69,7 @@ static int snapshot_open(struct inode *inode, struct file *filp) memset(&data->handle, 0, sizeof(struct snapshot_handle)); if ((filp->f_flags & O_ACCMODE) == O_RDONLY) { /* Hibernating. The image device should be accessible. */ - data->swap = swsusp_resume_device ? - swap_type_of(swsusp_resume_device, 0, NULL) : -1; + data->swap = swap_type_of(swsusp_resume_device, 0); data->mode = O_RDONLY; data->free_bitmaps = false; error = __pm_notifier_call_chain(PM_HIBERNATION_PREPARE, -1, &nr_calls); @@ -210,7 +209,6 @@ struct compat_resume_swap_area { static int snapshot_set_swap_area(struct snapshot_data *data, void __user *argp) { - struct block_device *bdev; sector_t offset; dev_t swdev; @@ -237,16 +235,10 @@ static int snapshot_set_swap_area(struct snapshot_data *data, * User space encodes device types as two-byte values, * so we need to recode them */ - if (!swdev) { - data->swap = -1; - return -EINVAL; - } - data->swap = swap_type_of(swdev, offset, &bdev); + data->swap = swap_type_of(swdev, offset); if (data->swap < 0) - return -ENODEV; - - data->dev = bdev->bd_dev; - bdput(bdev); + return swdev ? -ENODEV : -EINVAL; + data->dev = swdev; return 0; } |