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virtiofs: define dax address space operations

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This is done along the lines of ext4 and xfs.  I primarily wanted
->writepages hook at this time so that I could call into
dax_writeback_mapping_range().  This in turn will decide which pfns need to
be written back.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Vivek Goyal 2020-08-19 18:19:53 -04:00 committed by Miklos Szeredi
parent 2a9a609a0c
commit 9483e7d580
1 changed files with 18 additions and 0 deletions
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18
fs/fuse/dax.c
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@ -575,6 +575,16 @@ ssize_t fuse_dax_write_iter(struct kiocb *iocb, struct iov_iter *from)
return ret;
}
static int fuse_dax_writepages(struct address_space *mapping,
struct writeback_control *wbc)
{
struct inode *inode = mapping->host;
struct fuse_conn *fc = get_fuse_conn(inode);
return dax_writeback_mapping_range(mapping, fc->dax->dev, wbc);
}
static vm_fault_t __fuse_dax_fault(struct vm_fault *vmf,
enum page_entry_size pe_size, bool write)
{
@ -741,6 +751,13 @@ bool fuse_dax_inode_alloc(struct super_block *sb, struct fuse_inode *fi)
return true;
}
static const struct address_space_operations fuse_dax_file_aops = {
.writepages = fuse_dax_writepages,
.direct_IO = noop_direct_IO,
.set_page_dirty = noop_set_page_dirty,
.invalidatepage = noop_invalidatepage,
};
void fuse_dax_inode_init(struct inode *inode)
{
struct fuse_conn *fc = get_fuse_conn(inode);
@ -749,6 +766,7 @@ void fuse_dax_inode_init(struct inode *inode)
return;
inode->i_flags |= S_DAX;
inode->i_data.a_ops = &fuse_dax_file_aops;
}
bool fuse_dax_check_alignment(struct fuse_conn *fc, unsigned int map_alignment)