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mm, fs: introduce mapping_gfp_constraint()

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There are many places which use mapping_gfp_mask to restrict a more
generic gfp mask which would be used for allocations which are not
directly related to the page cache but they are performed in the same
context.

Let's introduce a helper function which makes the restriction explicit and
easier to track.  This patch doesn't introduce any functional changes.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Michal Hocko <mhocko@suse.com>
Suggested-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Michal Hocko
2015-11-06 16:28:49 -08:00
committed by Linus Torvalds
parent 8990332760
commit c62d25556b
19 changed files with 36 additions and 30 deletions
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7
fs/ceph/addr.c
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@@ -1283,8 +1283,8 @@ static int ceph_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
int ret1;
struct address_space *mapping = inode->i_mapping;
struct page *page = find_or_create_page(mapping, 0,
mapping_gfp_mask(mapping) &
~__GFP_FS);
mapping_gfp_constraint(mapping,
~__GFP_FS));
if (!page) {
ret = VM_FAULT_OOM;
goto out;
@@ -1428,7 +1428,8 @@ void ceph_fill_inline_data(struct inode *inode, struct page *locked_page,
if (i_size_read(inode) == 0)
return;
page = find_or_create_page(mapping, 0,
mapping_gfp_mask(mapping) & ~__GFP_FS);
mapping_gfp_constraint(mapping,
~__GFP_FS));
if (!page)
return;
if (PageUptodate(page)) {