* Re: Regression: hibernation is broken since e6bc9de714972cac34daa1dc1567ee48a47a9342
[not found] ` <20200213194135.GF6870@magnolia>
@ 2020-02-14 21:15 ` Domenico Andreoli
2020-02-19 5:03 ` Darrick J. Wong
2020-02-22 0:23 ` Darrick J. Wong
0 siblings, 2 replies; 6+ messages in thread
From: Domenico Andreoli @ 2020-02-14 21:15 UTC (permalink / raw)
To: Darrick J. Wong
Cc: Christoph Hellwig, Linus Torvalds, Linux Kernel Mailing List, linux-pm
[ added linux-pm ]
On Thu, Feb 13, 2020 at 11:41:35AM -0800, Darrick J. Wong wrote:
> On Thu, Feb 13, 2020 at 11:34:10AM -0800, Darrick J. Wong wrote:
> >
> > Well ... you could try the in-kernel hibernate (which I think is what
> > 'systemctl hibernate' does), though you'd lose the nifty features of
> > µswsusp.
Indeed 'systemctl hibernate' works perfectly with v5.6-rc1 in my setup.
> > In the end, though, I'll probably have to revert all those IS_SWAPFILE
> > checks (at least if CONFIG_HIBERNATION=y) since it's not fair to force
> > you to totally reconfigure your hibernation setup.
>
> Also, does the following partial revert fix uswsusp for you? It'll
> allow the direct writes that uswsusp wants to do, while leaving the rest
> (mmap writes) in place.
>
> --D
>
> diff --git a/fs/block_dev.c b/fs/block_dev.c
> index 69bf2fb6f7cd..077d9fa6b87d 100644
> --- a/fs/block_dev.c
> +++ b/fs/block_dev.c
> @@ -2001,8 +2001,10 @@ ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from)
> if (bdev_read_only(I_BDEV(bd_inode)))
> return -EPERM;
>
> +#ifndef CONFIG_HIBERNATION
> if (IS_SWAPFILE(bd_inode))
> return -ETXTBSY;
> +#endif
This alone is enough to make uswsusp work again.
I propose this alternative:
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -2001,7 +2001,8 @@ ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from)
if (bdev_read_only(I_BDEV(bd_inode)))
return -EPERM;
- if (IS_SWAPFILE(bd_inode))
+ /* Hibernation might happen via uswsusp, let it write to the swap */
+ if (IS_SWAPFILE(bd_inode) && !IS_ENABLED(CONFIG_HIBERNATION))
return -ETXTBSY;
if (!iov_iter_count(from))
I looked for a more selective way to enable writes to swap at runtime,
so I tried with system_entering_hibernation() but it's not yet armed
at the point in which uswsusp wants to write to the swap and therefore
it does not work.
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -34,6 +34,7 @@
#include <linux/task_io_accounting_ops.h>
#include <linux/falloc.h>
#include <linux/uaccess.h>
+#include <linux/suspend.h>
#include "internal.h"
struct bdev_inode {
@@ -2001,7 +2002,8 @@ ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from)
if (bdev_read_only(I_BDEV(bd_inode)))
return -EPERM;
- if (IS_SWAPFILE(bd_inode))
+ /* Hibernation might happen via uswsusp, let it write to the swap */
+ if (IS_SWAPFILE(bd_inode) && !system_entering_hibernation())
return -ETXTBSY;
if (!iov_iter_count(from))
> if (!iov_iter_count(from))
> return 0;
> diff --git a/mm/filemap.c b/mm/filemap.c
> index 1784478270e1..3df3211abe25 100644
> --- a/mm/filemap.c
> +++ b/mm/filemap.c
> @@ -2920,8 +2920,10 @@ inline ssize_t generic_write_checks(struct kiocb *iocb, struct iov_iter *from)
> loff_t count;
> int ret;
>
> +#ifndef CONFIG_HIBERNATION
> if (IS_SWAPFILE(inode))
> return -ETXTBSY;
> +#endif
>
> if (!iov_iter_count(from))
> return 0;
The above is not needed in my case but I'm not sure it would not be
needed in some other configuration of uswsusp.
Dom
--
rsa4096: 3B10 0CA1 8674 ACBA B4FE FCD2 CE5B CF17 9960 DE13
ed25519: FFB4 0CC3 7F2E 091D F7DA 356E CC79 2832 ED38 CB05
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Regression: hibernation is broken since e6bc9de714972cac34daa1dc1567ee48a47a9342
2020-02-14 21:15 ` Regression: hibernation is broken since e6bc9de714972cac34daa1dc1567ee48a47a9342 Domenico Andreoli
@ 2020-02-19 5:03 ` Darrick J. Wong
2020-02-22 0:23 ` Darrick J. Wong
1 sibling, 0 replies; 6+ messages in thread
From: Darrick J. Wong @ 2020-02-19 5:03 UTC (permalink / raw)
To: Christoph Hellwig, Linus Torvalds, Linux Kernel Mailing List, linux-pm
On Fri, Feb 14, 2020 at 10:15:24PM +0100, Domenico Andreoli wrote:
> [ added linux-pm ]
>
> On Thu, Feb 13, 2020 at 11:41:35AM -0800, Darrick J. Wong wrote:
> > On Thu, Feb 13, 2020 at 11:34:10AM -0800, Darrick J. Wong wrote:
> > >
> > > Well ... you could try the in-kernel hibernate (which I think is what
> > > 'systemctl hibernate' does), though you'd lose the nifty features of
> > > µswsusp.
>
> Indeed 'systemctl hibernate' works perfectly with v5.6-rc1 in my setup.
As I suspected, the in-kernel hibernate can write the memory image to
the swap file just fine...
> > > In the end, though, I'll probably have to revert all those IS_SWAPFILE
> > > checks (at least if CONFIG_HIBERNATION=y) since it's not fair to force
> > > you to totally reconfigure your hibernation setup.
> >
> > Also, does the following partial revert fix uswsusp for you? It'll
> > allow the direct writes that uswsusp wants to do, while leaving the rest
> > (mmap writes) in place.
> >
> > --D
> >
> > diff --git a/fs/block_dev.c b/fs/block_dev.c
> > index 69bf2fb6f7cd..077d9fa6b87d 100644
> > --- a/fs/block_dev.c
> > +++ b/fs/block_dev.c
> > @@ -2001,8 +2001,10 @@ ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from)
> > if (bdev_read_only(I_BDEV(bd_inode)))
> > return -EPERM;
> >
> > +#ifndef CONFIG_HIBERNATION
> > if (IS_SWAPFILE(bd_inode))
> > return -ETXTBSY;
> > +#endif
>
> This alone is enough to make uswsusp work again.
>
> I propose this alternative:
>
> --- a/fs/block_dev.c
> +++ b/fs/block_dev.c
> @@ -2001,7 +2001,8 @@ ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from)
> if (bdev_read_only(I_BDEV(bd_inode)))
> return -EPERM;
>
> - if (IS_SWAPFILE(bd_inode))
> + /* Hibernation might happen via uswsusp, let it write to the swap */
> + if (IS_SWAPFILE(bd_inode) && !IS_ENABLED(CONFIG_HIBERNATION))
...but maybe we could do something a little more targeted?
> return -ETXTBSY;
>
> if (!iov_iter_count(from))
>
> I looked for a more selective way to enable writes to swap at runtime,
> so I tried with system_entering_hibernation() but it's not yet armed
> at the point in which uswsusp wants to write to the swap and therefore
> it does not work.
Hmm. I was poking around in the uswsusp code and I /think/ it prepares
the kernel for the userspace-driven hibernation by calling the ioctl
SNAPSHOT_SET_SWAP_FILE on the device that it's going to use. If that's
true, we could have it clear S_SWAPFILE on the chosen device, though I'd
have to do some more digging to figure out how to restore the flag after
resuming from hibernation.
--D
>
> --- a/fs/block_dev.c
> +++ b/fs/block_dev.c
> @@ -34,6 +34,7 @@
> #include <linux/task_io_accounting_ops.h>
> #include <linux/falloc.h>
> #include <linux/uaccess.h>
> +#include <linux/suspend.h>
> #include "internal.h"
>
> struct bdev_inode {
> @@ -2001,7 +2002,8 @@ ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from)
> if (bdev_read_only(I_BDEV(bd_inode)))
> return -EPERM;
>
> - if (IS_SWAPFILE(bd_inode))
> + /* Hibernation might happen via uswsusp, let it write to the swap */
> + if (IS_SWAPFILE(bd_inode) && !system_entering_hibernation())
> return -ETXTBSY;
>
> if (!iov_iter_count(from))
>
> > if (!iov_iter_count(from))
> > return 0;
> > diff --git a/mm/filemap.c b/mm/filemap.c
> > index 1784478270e1..3df3211abe25 100644
> > --- a/mm/filemap.c
> > +++ b/mm/filemap.c
> > @@ -2920,8 +2920,10 @@ inline ssize_t generic_write_checks(struct kiocb *iocb, struct iov_iter *from)
> > loff_t count;
> > int ret;
> >
> > +#ifndef CONFIG_HIBERNATION
> > if (IS_SWAPFILE(inode))
> > return -ETXTBSY;
> > +#endif
> >
> > if (!iov_iter_count(from))
> > return 0;
>
> The above is not needed in my case but I'm not sure it would not be
> needed in some other configuration of uswsusp.
>
> Dom
>
> --
> rsa4096: 3B10 0CA1 8674 ACBA B4FE FCD2 CE5B CF17 9960 DE13
> ed25519: FFB4 0CC3 7F2E 091D F7DA 356E CC79 2832 ED38 CB05
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Regression: hibernation is broken since e6bc9de714972cac34daa1dc1567ee48a47a9342
2020-02-14 21:15 ` Regression: hibernation is broken since e6bc9de714972cac34daa1dc1567ee48a47a9342 Domenico Andreoli
2020-02-19 5:03 ` Darrick J. Wong
@ 2020-02-22 0:23 ` Darrick J. Wong
2020-02-23 19:03 ` Domenico Andreoli
1 sibling, 1 reply; 6+ messages in thread
From: Darrick J. Wong @ 2020-02-22 0:23 UTC (permalink / raw)
To: Christoph Hellwig, Linus Torvalds, Linux Kernel Mailing List, linux-pm
On Fri, Feb 14, 2020 at 10:15:24PM +0100, Domenico Andreoli wrote:
> [ added linux-pm ]
>
> On Thu, Feb 13, 2020 at 11:41:35AM -0800, Darrick J. Wong wrote:
> > On Thu, Feb 13, 2020 at 11:34:10AM -0800, Darrick J. Wong wrote:
> > >
> > > Well ... you could try the in-kernel hibernate (which I think is what
> > > 'systemctl hibernate' does), though you'd lose the nifty features of
> > > µswsusp.
>
> Indeed 'systemctl hibernate' works perfectly with v5.6-rc1 in my setup.
>
> > > In the end, though, I'll probably have to revert all those IS_SWAPFILE
> > > checks (at least if CONFIG_HIBERNATION=y) since it's not fair to force
> > > you to totally reconfigure your hibernation setup.
> >
> > Also, does the following partial revert fix uswsusp for you? It'll
> > allow the direct writes that uswsusp wants to do, while leaving the rest
> > (mmap writes) in place.
> >
> > --D
> >
> > diff --git a/fs/block_dev.c b/fs/block_dev.c
> > index 69bf2fb6f7cd..077d9fa6b87d 100644
> > --- a/fs/block_dev.c
> > +++ b/fs/block_dev.c
> > @@ -2001,8 +2001,10 @@ ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from)
> > if (bdev_read_only(I_BDEV(bd_inode)))
> > return -EPERM;
> >
> > +#ifndef CONFIG_HIBERNATION
> > if (IS_SWAPFILE(bd_inode))
> > return -ETXTBSY;
> > +#endif
>
> This alone is enough to make uswsusp work again.
>
> I propose this alternative:
>
> --- a/fs/block_dev.c
> +++ b/fs/block_dev.c
> @@ -2001,7 +2001,8 @@ ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from)
> if (bdev_read_only(I_BDEV(bd_inode)))
> return -EPERM;
>
> - if (IS_SWAPFILE(bd_inode))
> + /* Hibernation might happen via uswsusp, let it write to the swap */
> + if (IS_SWAPFILE(bd_inode) && !IS_ENABLED(CONFIG_HIBERNATION))
> return -ETXTBSY;
>
> if (!iov_iter_count(from))
>
> I looked for a more selective way to enable writes to swap at runtime,
> so I tried with system_entering_hibernation() but it's not yet armed
> at the point in which uswsusp wants to write to the swap and therefore
> it does not work.
>
> --- a/fs/block_dev.c
> +++ b/fs/block_dev.c
> @@ -34,6 +34,7 @@
> #include <linux/task_io_accounting_ops.h>
> #include <linux/falloc.h>
> #include <linux/uaccess.h>
> +#include <linux/suspend.h>
> #include "internal.h"
>
> struct bdev_inode {
> @@ -2001,7 +2002,8 @@ ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from)
> if (bdev_read_only(I_BDEV(bd_inode)))
> return -EPERM;
>
> - if (IS_SWAPFILE(bd_inode))
> + /* Hibernation might happen via uswsusp, let it write to the swap */
> + if (IS_SWAPFILE(bd_inode) && !system_entering_hibernation())
> return -ETXTBSY;
>
> if (!iov_iter_count(from))
>
> > if (!iov_iter_count(from))
> > return 0;
> > diff --git a/mm/filemap.c b/mm/filemap.c
> > index 1784478270e1..3df3211abe25 100644
> > --- a/mm/filemap.c
> > +++ b/mm/filemap.c
> > @@ -2920,8 +2920,10 @@ inline ssize_t generic_write_checks(struct kiocb *iocb, struct iov_iter *from)
> > loff_t count;
> > int ret;
> >
> > +#ifndef CONFIG_HIBERNATION
> > if (IS_SWAPFILE(inode))
> > return -ETXTBSY;
> > +#endif
> >
> > if (!iov_iter_count(from))
> > return 0;
>
> The above is not needed in my case but I'm not sure it would not be
> needed in some other configuration of uswsusp.
Ok, third try. Does the following work? This is a little more
selective in that it only disables the write protection on the swap
device/file that uswusp is going to write to.
--D
diff --git a/kernel/power/user.c b/kernel/power/user.c
index 77438954cc2b..a3ae9cbbfcf0 100644
--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -372,10 +372,17 @@ static long snapshot_ioctl(struct file *filp, unsigned int cmd,
*/
swdev = new_decode_dev(swap_area.dev);
if (swdev) {
+ struct block_device *bd;
+
offset = swap_area.offset;
- data->swap = swap_type_of(swdev, offset, NULL);
+ data->swap = swap_type_of(swdev, offset, &bd);
if (data->swap < 0)
error = -ENODEV;
+
+ inode_lock(bd->bd_inode);
+ bd->bd_inode->i_flags &= ~S_SWAPFILE;
+ inode_unlock(bd->bd_inode);
+ bdput(bd);
} else {
data->swap = -1;
error = -EINVAL;
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: Regression: hibernation is broken since e6bc9de714972cac34daa1dc1567ee48a47a9342
2020-02-22 0:23 ` Darrick J. Wong
@ 2020-02-23 19:03 ` Domenico Andreoli
2020-02-25 20:26 ` Darrick J. Wong
0 siblings, 1 reply; 6+ messages in thread
From: Domenico Andreoli @ 2020-02-23 19:03 UTC (permalink / raw)
To: Darrick J. Wong
Cc: Christoph Hellwig, Linus Torvalds, Linux Kernel Mailing List, linux-pm
On Fri, Feb 21, 2020 at 04:23:19PM -0800, Darrick J. Wong wrote:
>
> Ok, third try. Does the following work? This is a little more
> selective in that it only disables the write protection on the swap
> device/file that uswusp is going to write to.
Yes it works but also verified that once the S_SWAPFILE bit is cleared
it's never restored, therefore the protecton is gone after the first
hibernation.
>
> --D
>
> diff --git a/kernel/power/user.c b/kernel/power/user.c
> index 77438954cc2b..a3ae9cbbfcf0 100644
> --- a/kernel/power/user.c
> +++ b/kernel/power/user.c
> @@ -372,10 +372,17 @@ static long snapshot_ioctl(struct file *filp, unsigned int cmd,
> */
> swdev = new_decode_dev(swap_area.dev);
> if (swdev) {
> + struct block_device *bd;
> +
> offset = swap_area.offset;
> - data->swap = swap_type_of(swdev, offset, NULL);
> + data->swap = swap_type_of(swdev, offset, &bd);
> if (data->swap < 0)
> error = -ENODEV;
> +
> + inode_lock(bd->bd_inode);
> + bd->bd_inode->i_flags &= ~S_SWAPFILE;
> + inode_unlock(bd->bd_inode);
> + bdput(bd);
> } else {
> data->swap = -1;
> error = -EINVAL;
--
rsa4096: 3B10 0CA1 8674 ACBA B4FE FCD2 CE5B CF17 9960 DE13
ed25519: FFB4 0CC3 7F2E 091D F7DA 356E CC79 2832 ED38 CB05
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Regression: hibernation is broken since e6bc9de714972cac34daa1dc1567ee48a47a9342
2020-02-23 19:03 ` Domenico Andreoli
@ 2020-02-25 20:26 ` Darrick J. Wong
2020-03-17 15:51 ` Brad Campbell
0 siblings, 1 reply; 6+ messages in thread
From: Darrick J. Wong @ 2020-02-25 20:26 UTC (permalink / raw)
To: Christoph Hellwig, Linus Torvalds, Linux Kernel Mailing List, linux-pm
On Sun, Feb 23, 2020 at 08:03:11PM +0100, Domenico Andreoli wrote:
> On Fri, Feb 21, 2020 at 04:23:19PM -0800, Darrick J. Wong wrote:
> >
> > Ok, third try. Does the following work? This is a little more
> > selective in that it only disables the write protection on the swap
> > device/file that uswusp is going to write to.
>
> Yes it works but also verified that once the S_SWAPFILE bit is cleared
> it's never restored, therefore the protecton is gone after the first
> hibernation.
Ok, good. Now can you try the third part, which ought to re-apply
S_SWAPFILE after a successful resume, please? Assuming this works, I
think we're ready with a fixpatch.
--D
diff --git a/include/linux/swap.h b/include/linux/swap.h
index 1e99f7ac1d7e..add93e205850 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -458,6 +458,7 @@ extern void swap_free(swp_entry_t);
extern void swapcache_free_entries(swp_entry_t *entries, int n);
extern int free_swap_and_cache(swp_entry_t);
extern int swap_type_of(dev_t, sector_t, struct block_device **);
+extern void swap_relockall(void);
extern unsigned int count_swap_pages(int, int);
extern sector_t map_swap_page(struct page *, struct block_device **);
extern sector_t swapdev_block(int, pgoff_t);
diff --git a/kernel/power/user.c b/kernel/power/user.c
index 77438954cc2b..b11f7037ce5e 100644
--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -271,6 +271,8 @@ static long snapshot_ioctl(struct file *filp, unsigned int cmd,
break;
}
error = hibernation_restore(data->platform_support);
+ if (!error)
+ swap_relockall();
break;
case SNAPSHOT_FREE:
@@ -372,10 +374,17 @@ static long snapshot_ioctl(struct file *filp, unsigned int cmd,
*/
swdev = new_decode_dev(swap_area.dev);
if (swdev) {
+ struct block_device *bd;
+
offset = swap_area.offset;
- data->swap = swap_type_of(swdev, offset, NULL);
+ data->swap = swap_type_of(swdev, offset, &bd);
if (data->swap < 0)
error = -ENODEV;
+
+ inode_lock(bd->bd_inode);
+ bd->bd_inode->i_flags &= ~S_SWAPFILE;
+ inode_unlock(bd->bd_inode);
+ bdput(bd);
} else {
data->swap = -1;
error = -EINVAL;
diff --git a/mm/swapfile.c b/mm/swapfile.c
index b2a2e45c9a36..a64dcba10db6 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -1799,6 +1799,32 @@ int swap_type_of(dev_t device, sector_t offset, struct block_device **bdev_p)
return -ENODEV;
}
+/* Re-lock swap devices after resuming from userspace suspend. */
+void swap_relockall(void)
+{
+ int type;
+
+ spin_lock(&swap_lock);
+ for (type = 0; type < nr_swapfiles; type++) {
+ struct swap_info_struct *sis = swap_info[type];
+ struct block_device *bdev = bdgrab(sis->bdev);
+
+ /*
+ * uswsusp only knows how to suspend to block devices, so we
+ * can skip swap files.
+ */
+ if (!(sis->flags & SWP_WRITEOK) ||
+ !(sis->flags & SWP_BLKDEV))
+ continue;
+
+ inode_lock(bd->bd_inode);
+ bd->bd_inode->i_flags |= S_SWAPFILE;
+ inode_unlock(bd->bd_inode);
+ bdput(bd);
+ }
+ spin_unlock(&swap_lock);
+}
+
/*
* Get the (PAGE_SIZE) block corresponding to given offset on the swapdev
* corresponding to given index in swap_info (swap type).
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: Regression: hibernation is broken since e6bc9de714972cac34daa1dc1567ee48a47a9342
2020-02-25 20:26 ` Darrick J. Wong
@ 2020-03-17 15:51 ` Brad Campbell
0 siblings, 0 replies; 6+ messages in thread
From: Brad Campbell @ 2020-03-17 15:51 UTC (permalink / raw)
To: Darrick J. Wong, Christoph Hellwig, Linus Torvalds,
Linux Kernel Mailing List, linux-pm
On 26/2/20 4:26 am, Darrick J. Wong wrote:
> On Sun, Feb 23, 2020 at 08:03:11PM +0100, Domenico Andreoli wrote:
>> On Fri, Feb 21, 2020 at 04:23:19PM -0800, Darrick J. Wong wrote:
>>>
>>> Ok, third try. Does the following work? This is a little more
>>> selective in that it only disables the write protection on the swap
>>> device/file that uswusp is going to write to.
>>
>> Yes it works but also verified that once the S_SWAPFILE bit is cleared
>> it's never restored, therefore the protecton is gone after the first
>> hibernation.
>
> Ok, good. Now can you try the third part, which ought to re-apply
> S_SWAPFILE after a successful resume, please? Assuming this works, I
> think we're ready with a fixpatch.
>
I just bumped up against it upgrading from 5.2 to 5.5 & a long bisection results in apparently the same point :
# first bad commit: [dc617f29dbe5ef0c8ced65ce62c464af1daaab3d] vfs: don't allow writes to swap files
Tested-By: Brad Campbell <lists2009@fnarfbargle.com>
> --D
>
> diff --git a/include/linux/swap.h b/include/linux/swap.h
> index 1e99f7ac1d7e..add93e205850 100644
> --- a/include/linux/swap.h
> +++ b/include/linux/swap.h
> @@ -458,6 +458,7 @@ extern void swap_free(swp_entry_t);
> extern void swapcache_free_entries(swp_entry_t *entries, int n);
> extern int free_swap_and_cache(swp_entry_t);
> extern int swap_type_of(dev_t, sector_t, struct block_device **);
> +extern void swap_relockall(void);
> extern unsigned int count_swap_pages(int, int);
> extern sector_t map_swap_page(struct page *, struct block_device **);
> extern sector_t swapdev_block(int, pgoff_t);
> diff --git a/kernel/power/user.c b/kernel/power/user.c
> index 77438954cc2b..b11f7037ce5e 100644
> --- a/kernel/power/user.c
> +++ b/kernel/power/user.c
> @@ -271,6 +271,8 @@ static long snapshot_ioctl(struct file *filp, unsigned int cmd,
> break;
> }
> error = hibernation_restore(data->platform_support);
> + if (!error)
> + swap_relockall();
> break;
>
> case SNAPSHOT_FREE:
> @@ -372,10 +374,17 @@ static long snapshot_ioctl(struct file *filp, unsigned int cmd,
> */
> swdev = new_decode_dev(swap_area.dev);
> if (swdev) {
> + struct block_device *bd;
> +
> offset = swap_area.offset;
> - data->swap = swap_type_of(swdev, offset, NULL);
> + data->swap = swap_type_of(swdev, offset, &bd);
> if (data->swap < 0)
> error = -ENODEV;
> +
> + inode_lock(bd->bd_inode);
> + bd->bd_inode->i_flags &= ~S_SWAPFILE;
> + inode_unlock(bd->bd_inode);
> + bdput(bd);
> } else {
> data->swap = -1;
> error = -EINVAL;
> diff --git a/mm/swapfile.c b/mm/swapfile.c
> index b2a2e45c9a36..a64dcba10db6 100644
> --- a/mm/swapfile.c
> +++ b/mm/swapfile.c
> @@ -1799,6 +1799,32 @@ int swap_type_of(dev_t device, sector_t offset, struct block_device **bdev_p)
> return -ENODEV;
> }
>
> +/* Re-lock swap devices after resuming from userspace suspend. */
> +void swap_relockall(void)
> +{
> + int type;
> +
> + spin_lock(&swap_lock);
> + for (type = 0; type < nr_swapfiles; type++) {
> + struct swap_info_struct *sis = swap_info[type];
> + struct block_device *bdev = bdgrab(sis->bdev);
> +
> + /*
> + * uswsusp only knows how to suspend to block devices, so we
> + * can skip swap files.
> + */
> + if (!(sis->flags & SWP_WRITEOK) ||
> + !(sis->flags & SWP_BLKDEV))
> + continue;
> +
> + inode_lock(bd->bd_inode);
> + bd->bd_inode->i_flags |= S_SWAPFILE;
> + inode_unlock(bd->bd_inode);
> + bdput(bd);
> + }
> + spin_unlock(&swap_lock);
> +}
> +
> /*
> * Get the (PAGE_SIZE) block corresponding to given offset on the swapdev
> * corresponding to given index in swap_info (swap type).
>
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2020-03-17 16:16 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
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2020-02-14 21:15 ` Regression: hibernation is broken since e6bc9de714972cac34daa1dc1567ee48a47a9342 Domenico Andreoli
2020-02-19 5:03 ` Darrick J. Wong
2020-02-22 0:23 ` Darrick J. Wong
2020-02-23 19:03 ` Domenico Andreoli
2020-02-25 20:26 ` Darrick J. Wong
2020-03-17 15:51 ` Brad Campbell
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