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authorPankaj Gupta <pagupta@redhat.com>2019-07-05 17:03:27 +0300
committerDan Williams <dan.j.williams@intel.com>2019-07-06 01:19:10 +0300
commite46bfc3f03d7894c0eb47c7d754c38bafe39e197 (patch)
tree5a90c4400c9c87a22f25189160ef503e5c5d609d /fs/ext4/file.c
parent32de1484648a837db5dea0a7007fe7136804e392 (diff)
downloadlinux-e46bfc3f03d7894c0eb47c7d754c38bafe39e197.tar.xz
ext4: disable map_sync for async flush
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 ext4. Signed-off-by: Pankaj Gupta <pagupta@redhat.com> Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'fs/ext4/file.c')
-rw-r--r--fs/ext4/file.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 2c5baa5e8291..4feeecae8db6 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -367,15 +367,17 @@ 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;
/*
- * We don't support synchronous mappings for non-DAX files. At least
- * until someone comes with a sensible use case.
+ * 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(file)) && (vma->vm_flags & VM_SYNC))
+ if (!daxdev_mapping_supported(vma, dax_dev))
return -EOPNOTSUPP;
file_accessed(file);