fallocate hole punch will want to unmap a specific range of pages.
Modify the existing hugetlb_vmtruncate_list() routine to take a
start/end range. If end is 0, this indicates all pages after start
should be unmapped. This is the same as the existing truncate
functionality. Modify existing callers to add 0 as end of range.
Since the routine will be used in hole punch as well as truncate
operations, it is more appropriately renamed to hugetlb_vmdelete_list().
Signed-off-by: Mike Kravetz <mike.krav...@oracle.com>
---
fs/hugetlbfs/inode.c | 25 ++++++++++++++++++-------
1 file changed, 18 insertions(+), 7 deletions(-)
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 0cf74df..ed40f56 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -349,11 +349,15 @@ static void hugetlbfs_evict_inode(struct inode *inode)
}
static inline void
-hugetlb_vmtruncate_list(struct rb_root *root, pgoff_t pgoff)
+hugetlb_vmdelete_list(struct rb_root *root, pgoff_t start, pgoff_t end)
{
struct vm_area_struct *vma;
- vma_interval_tree_foreach(vma, root, pgoff, ULONG_MAX) {
+ /*
+ * end == 0 indicates that the entire range after
+ * start should be unmapped.
+ */
+ vma_interval_tree_foreach(vma, root, start, end ? end : ULONG_MAX) {
unsigned long v_offset;
/*
@@ -362,13 +366,20 @@ hugetlb_vmtruncate_list(struct rb_root *root, pgoff_t
pgoff)
* which overlap the truncated area starting at pgoff,
* and no vma on a 32-bit arch can span beyond the 4GB.
*/
- if (vma->vm_pgoff < pgoff)
- v_offset = (pgoff - vma->vm_pgoff) << PAGE_SHIFT;
+ if (vma->vm_pgoff < start)
+ v_offset = (start - vma->vm_pgoff) << PAGE_SHIFT;
else
v_offset = 0;
- unmap_hugepage_range(vma, vma->vm_start + v_offset,
- vma->vm_end, NULL);
+ if (end) {
+ end = ((end - start) << PAGE_SHIFT) +
+ vma->vm_start + v_offset;
+ if (end > vma->vm_end)
+ end = vma->vm_end;
+ } else
+ end = vma->vm_end;
+
+ unmap_hugepage_range(vma, vma->vm_start + v_offset, end, NULL);
}
}
@@ -384,7 +395,7 @@ static int hugetlb_vmtruncate(struct inode *inode, loff_t
offset)
i_size_write(inode, offset);
i_mmap_lock_write(mapping);
if (!RB_EMPTY_ROOT(&mapping->i_mmap))
- hugetlb_vmtruncate_list(&mapping->i_mmap, pgoff);
+ hugetlb_vmdelete_list(&mapping->i_mmap, pgoff, 0);
i_mmap_unlock_write(mapping);
truncate_hugepages(inode, offset);
return 0;
--
2.1.0
--
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