| Message ID | 20190403104018.23947-5-pagupta@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | virtio pmem driver | expand |
On Wed 03-04-19 16:10:17, Pankaj Gupta wrote: > Virtio pmem provides asynchronous host page cache flush > mechanism. We don't support 'MAP_SYNC' with virtio pmem > and ext4. > > Signed-off-by: Pankaj Gupta <pagupta@redhat.com> The patch looks good to me. You can add: Reviewed-by: Jan Kara <jack@suse.cz> Honza > --- > fs/ext4/file.c | 11 ++++++++++- > 1 file changed, 10 insertions(+), 1 deletion(-) > > diff --git a/fs/ext4/file.c b/fs/ext4/file.c > index 69d65d49837b..86e4bf464320 100644 > --- a/fs/ext4/file.c > +++ b/fs/ext4/file.c > @@ -360,8 +360,10 @@ static const struct vm_operations_struct ext4_file_vm_ops = { > static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma) > { > struct inode *inode = file->f_mapping->host; > + struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); > + struct dax_device *dax_dev = sbi->s_daxdev; > > - if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) > + if (unlikely(ext4_forced_shutdown(sbi))) > return -EIO; > > /* > @@ -371,6 +373,13 @@ static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma) > if (!IS_DAX(file_inode(file)) && (vma->vm_flags & VM_SYNC)) > return -EOPNOTSUPP; > > + /* We don't support synchronous mappings with DAX files if > + * dax_device is not synchronous. > + */ > + if (IS_DAX(file_inode(file)) && !dax_synchronous(dax_dev) > + && (vma->vm_flags & VM_SYNC)) > + return -EOPNOTSUPP; > + > file_accessed(file); > if (IS_DAX(file_inode(file))) { > vma->vm_ops = &ext4_dax_vm_ops; > -- > 2.20.1 >
diff --git a/fs/ext4/file.c b/fs/ext4/file.c index 69d65d49837b..86e4bf464320 100644 --- a/fs/ext4/file.c +++ b/fs/ext4/file.c @@ -360,8 +360,10 @@ static const struct vm_operations_struct ext4_file_vm_ops = { static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma) { struct inode *inode = file->f_mapping->host; + struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); + struct dax_device *dax_dev = sbi->s_daxdev; - if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) + if (unlikely(ext4_forced_shutdown(sbi))) return -EIO; /* @@ -371,6 +373,13 @@ static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma) if (!IS_DAX(file_inode(file)) && (vma->vm_flags & VM_SYNC)) return -EOPNOTSUPP; + /* We don't support synchronous mappings with DAX files if + * dax_device is not synchronous. + */ + if (IS_DAX(file_inode(file)) && !dax_synchronous(dax_dev) + && (vma->vm_flags & VM_SYNC)) + return -EOPNOTSUPP; + file_accessed(file); if (IS_DAX(file_inode(file))) { vma->vm_ops = &ext4_dax_vm_ops;
Virtio pmem provides asynchronous host page cache flush mechanism. We don't support 'MAP_SYNC' with virtio pmem and ext4. Signed-off-by: Pankaj Gupta <pagupta@redhat.com> --- fs/ext4/file.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-)