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The fuse file system implements fuse_dax_break_layouts() to do this which includes a comment indicating that passing dmap_end == 0 leads to unmapping of the whole file. However this is not true - passing dmap_end == 0 will not unmap anything before dmap_start, and further more dax_layout_busy_page_range() will not scan any of the range to see if there maybe ongoing DMA access to the range. Fix this by checking for dmap_end == 0 in fuse_dax_break_layouts() and pass the entire file range to dax_layout_busy_page_range(). Signed-off-by: Alistair Popple Fixes: 6ae330cad6ef ("virtiofs: serialize truncate/punch_hole and dax fault path") Cc: Vivek Goyal --- I am not at all familiar with the fuse file system driver so I have no idea if the comment is relevant or not and whether the documented behaviour for dmap_end == 0 is ever relied upon. However this seemed like the safest fix unless someone more familiar with fuse can confirm that dmap_end == 0 is never used. --- fs/fuse/dax.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/fuse/dax.c b/fs/fuse/dax.c index 9abbc2f..c5d1fea 100644 --- a/fs/fuse/dax.c +++ b/fs/fuse/dax.c @@ -693,6 +693,10 @@ int fuse_dax_break_layouts(struct inode *inode, u64 dmap_start, ret = __fuse_dax_break_layouts(inode, &retry, dmap_start, dmap_end); } while (ret == 0 && retry); + if (!dmap_end) { + dmap_start = 0; + dmap_end = LLONG_MAX; + } return ret; }