| Message ID | 20190423080612.15361-7-pagupta@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | virtio pmem driver | expand |
On Tue, Apr 23, 2019 at 01:36:12PM +0530, Pankaj Gupta wrote: > Dont support 'MAP_SYNC' with non-DAX files and DAX files > with asynchronous dax_device. Virtio pmem provides > asynchronous host page cache flush mechanism. We don't > support 'MAP_SYNC' with virtio pmem and xfs. > > Signed-off-by: Pankaj Gupta <pagupta@redhat.com> > --- > fs/xfs/xfs_file.c | 10 ++++++---- > 1 file changed, 6 insertions(+), 4 deletions(-) > > diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c > index 1f2e2845eb76..0e59be018511 100644 > --- a/fs/xfs/xfs_file.c > +++ b/fs/xfs/xfs_file.c > @@ -1196,11 +1196,13 @@ xfs_file_mmap( > struct file *filp, > struct vm_area_struct *vma) > { > - /* > - * We don't support synchronous mappings for non-DAX files. At least > - * until someone comes with a sensible use case. > + struct dax_device *dax_dev = xfs_find_daxdev_for_inode > + (file_inode(filp)); > + > + /* We don't support synchronous mappings for non-DAX files and > + * for DAX files if underneath dax_device is not synchronous. > */ /* * This is the correct multi-line comment format. Please * update the patch to maintain the existing comment format. */ Cheers, Dave.
On Wed, Apr 24, 2019 at 08:02:17AM +1000, Dave Chinner wrote: > On Tue, Apr 23, 2019 at 01:36:12PM +0530, Pankaj Gupta wrote: > > Dont support 'MAP_SYNC' with non-DAX files and DAX files > > with asynchronous dax_device. Virtio pmem provides > > asynchronous host page cache flush mechanism. We don't > > support 'MAP_SYNC' with virtio pmem and xfs. > > > > Signed-off-by: Pankaj Gupta <pagupta@redhat.com> > > --- > > fs/xfs/xfs_file.c | 10 ++++++---- > > 1 file changed, 6 insertions(+), 4 deletions(-) > > > > diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c > > index 1f2e2845eb76..0e59be018511 100644 > > --- a/fs/xfs/xfs_file.c > > +++ b/fs/xfs/xfs_file.c > > @@ -1196,11 +1196,13 @@ xfs_file_mmap( > > struct file *filp, > > struct vm_area_struct *vma) > > { > > - /* > > - * We don't support synchronous mappings for non-DAX files. At least > > - * until someone comes with a sensible use case. > > + struct dax_device *dax_dev = xfs_find_daxdev_for_inode > > + (file_inode(filp)); tab separation here ^^^ ^^^^ and cut down the indent while you're at it, please: struct dax_device *dax_dev; dax_dev = xfs_find_daxdev_for_inode(file_inode(filp)); if (!dax_is_frobbed(dax)) return -EMEWANTCOOKIE; --D > > + > > + /* We don't support synchronous mappings for non-DAX files and > > + * for DAX files if underneath dax_device is not synchronous. > > */ > > /* > * This is the correct multi-line comment format. Please > * update the patch to maintain the existing comment format. > */ > > Cheers, > > Dave. > -- > Dave Chinner > david@fromorbit.com
> > On Tue, Apr 23, 2019 at 01:36:12PM +0530, Pankaj Gupta wrote: > > Dont support 'MAP_SYNC' with non-DAX files and DAX files > > with asynchronous dax_device. Virtio pmem provides > > asynchronous host page cache flush mechanism. We don't > > support 'MAP_SYNC' with virtio pmem and xfs. > > > > Signed-off-by: Pankaj Gupta <pagupta@redhat.com> > > --- > > fs/xfs/xfs_file.c | 10 ++++++---- > > 1 file changed, 6 insertions(+), 4 deletions(-) > > > > diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c > > index 1f2e2845eb76..0e59be018511 100644 > > --- a/fs/xfs/xfs_file.c > > +++ b/fs/xfs/xfs_file.c > > @@ -1196,11 +1196,13 @@ xfs_file_mmap( > > struct file *filp, > > struct vm_area_struct *vma) > > { > > - /* > > - * We don't support synchronous mappings for non-DAX files. At least > > - * until someone comes with a sensible use case. > > + struct dax_device *dax_dev = xfs_find_daxdev_for_inode > > + (file_inode(filp)); > > + > > + /* We don't support synchronous mappings for non-DAX files and > > + * for DAX files if underneath dax_device is not synchronous. > > */ > > /* > * This is the correct multi-line comment format. Please > * update the patch to maintain the existing comment format. > */ Sure. Will correct this for both xfs & ext4. Thanks, Pankaj > > Cheers, > > Dave. > -- > Dave Chinner > david@fromorbit.com >
> > On Wed, Apr 24, 2019 at 08:02:17AM +1000, Dave Chinner wrote: > > On Tue, Apr 23, 2019 at 01:36:12PM +0530, Pankaj Gupta wrote: > > > Dont support 'MAP_SYNC' with non-DAX files and DAX files > > > with asynchronous dax_device. Virtio pmem provides > > > asynchronous host page cache flush mechanism. We don't > > > support 'MAP_SYNC' with virtio pmem and xfs. > > > > > > Signed-off-by: Pankaj Gupta <pagupta@redhat.com> > > > --- > > > fs/xfs/xfs_file.c | 10 ++++++---- > > > 1 file changed, 6 insertions(+), 4 deletions(-) > > > > > > diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c > > > index 1f2e2845eb76..0e59be018511 100644 > > > --- a/fs/xfs/xfs_file.c > > > +++ b/fs/xfs/xfs_file.c > > > @@ -1196,11 +1196,13 @@ xfs_file_mmap( > > > struct file *filp, > > > struct vm_area_struct *vma) > > > { > > > - /* > > > - * We don't support synchronous mappings for non-DAX files. At least > > > - * until someone comes with a sensible use case. > > > + struct dax_device *dax_dev = xfs_find_daxdev_for_inode > > > + (file_inode(filp)); > > tab separation here ^^^ ^^^^ and cut > down the indent > while you're at > it, please: > > struct dax_device *dax_dev; > > dax_dev = xfs_find_daxdev_for_inode(file_inode(filp)); > if (!dax_is_frobbed(dax)) > return -EMEWANTCOOKIE; Done. Thanks, Pankaj > > --D > > > > + > > > + /* We don't support synchronous mappings for non-DAX files and > > > + * for DAX files if underneath dax_device is not synchronous. > > > */ > > > > /* > > * This is the correct multi-line comment format. Please > > * update the patch to maintain the existing comment format. > > */ > > > > Cheers, > > > > Dave. > > -- > > Dave Chinner > > david@fromorbit.com > >
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index 1f2e2845eb76..0e59be018511 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -1196,11 +1196,13 @@ xfs_file_mmap( struct file *filp, struct vm_area_struct *vma) { - /* - * We don't support synchronous mappings for non-DAX files. At least - * until someone comes with a sensible use case. + struct dax_device *dax_dev = xfs_find_daxdev_for_inode + (file_inode(filp)); + + /* We don't support synchronous mappings for non-DAX files and + * for DAX files if underneath dax_device is not synchronous. */ - if (!IS_DAX(file_inode(filp)) && (vma->vm_flags & VM_SYNC)) + if (!daxdev_mapping_supported(vma, dax_dev)) return -EOPNOTSUPP; file_accessed(filp);
Dont support 'MAP_SYNC' with non-DAX files and DAX files with asynchronous dax_device. Virtio pmem provides asynchronous host page cache flush mechanism. We don't support 'MAP_SYNC' with virtio pmem and xfs. Signed-off-by: Pankaj Gupta <pagupta@redhat.com> --- fs/xfs/xfs_file.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-)