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hugetlbfs: hugetlb_vmtruncate_list() needs to take a range to delete

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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.kravetz@oracle.com>
Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: Hillf Danton <hillf.zj@alibaba-inc.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Aneesh Kumar <aneesh.kumar@linux.vnet.ibm.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mike Kravetz 2015-09-08 15:01:38 -07:00 committed by Linus Torvalds
parent c672c7f29f
commit 1bfad99ab4
1 changed files with 18 additions and 7 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

25
fs/hugetlbfs/inode.c
View file

@ -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;