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| author | Hugh Dickins <hughd@google.com> | 2011-08-03 16:21:27 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-08-03 14:25:24 -1000 |
| commit | 31475dd611209413bace21651a400afb91d0bd9d (patch) | |
| tree | 679c1cb33e211a4f2e5c0f47bb836393c9454d35 /mm/truncate.c | |
| parent | 69f07ec938712b58755add82dd3d0b35f01317cc (diff) | |
| download | lwn-31475dd611209413bace21651a400afb91d0bd9d.tar.gz lwn-31475dd611209413bace21651a400afb91d0bd9d.zip | |
mm: a few small updates for radix-swap
Remove PageSwapBacked (!page_is_file_cache) cases from
add_to_page_cache_locked() and add_to_page_cache_lru(): those pages now
go through shmem_add_to_page_cache().
Remove a comment on maximum tmpfs size from fsstack_copy_inode_size(),
and add a comment on swap entries to invalidate_mapping_pages().
And mincore_page() uses find_get_page() on what might be shmem or a
tmpfs file: allow for a radix_tree_exceptional_entry(), and proceed to
find_get_page() on swapper_space if so (oh, swapper_space needs #ifdef).
Signed-off-by: Hugh Dickins <hughd@google.com>
Acked-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/truncate.c')
| -rw-r--r-- | mm/truncate.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/mm/truncate.c b/mm/truncate.c index 232eb2736a79..b40ac6d4e86e 100644 --- a/mm/truncate.c +++ b/mm/truncate.c @@ -336,6 +336,14 @@ unsigned long invalidate_mapping_pages(struct address_space *mapping, unsigned long count = 0; int i; + /* + * Note: this function may get called on a shmem/tmpfs mapping: + * pagevec_lookup() might then return 0 prematurely (because it + * got a gangful of swap entries); but it's hardly worth worrying + * about - it can rarely have anything to free from such a mapping + * (most pages are dirty), and already skips over any difficulties. + */ + pagevec_init(&pvec, 0); while (index <= end && pagevec_lookup(&pvec, mapping, index, min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1)) { |