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authorHugh Dickins <hugh@veritas.com>2008-02-04 22:28:50 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-05 09:44:15 -0800
commit73b1262fa43a778b1e154deea632cdef5009d6a1 (patch)
tree409f14e78e23cd999e8c3d1e0945f0fa9b67048f /mm/shmem.c
parentf000944d03a5b74ab3c92b2fcdf0e944cc898065 (diff)
tmpfs: move swap swizzling into shmem
move_to_swap_cache and move_from_swap_cache functions (which swizzle a page between tmpfs page cache and swap cache, to avoid page copying) are only used by shmem.c; and our subsequent fix for unionfs needs different treatments in the two instances of move_from_swap_cache. Move them from swap_state.c into their callsites shmem_writepage, shmem_unuse_inode and shmem_getpage, making add_to_swap_cache externally visible. shmem.c likes to say set_page_dirty where swap_state.c liked to say SetPageDirty: respect that diversity, which __set_page_dirty_no_writeback makes moot (and implies we should lose that "shift page from clean_pages to dirty_pages list" comment: it's on neither). Signed-off-by: Hugh Dickins <hugh@veritas.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/shmem.c')
-rw-r--r--mm/shmem.c16
1 files changed, 12 insertions, 4 deletions
diff --git a/mm/shmem.c b/mm/shmem.c
index 7be94342bf06..e577adf4ae85 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -884,7 +884,9 @@ lost2:
found:
idx += offset;
inode = &info->vfs_inode;
- if (move_from_swap_cache(page, idx, inode->i_mapping) == 0) {
+ if (add_to_page_cache(page, inode->i_mapping, idx, GFP_ATOMIC) == 0) {
+ delete_from_swap_cache(page);
+ set_page_dirty(page);
info->flags |= SHMEM_PAGEIN;
shmem_swp_set(info, ptr + offset, 0);
}
@@ -972,7 +974,8 @@ static int shmem_writepage(struct page *page, struct writeback_control *wbc)
BUG_ON(!entry);
BUG_ON(entry->val);
- if (move_to_swap_cache(page, swap) == 0) {
+ if (add_to_swap_cache(page, swap, GFP_ATOMIC) == 0) {
+ remove_from_page_cache(page);
shmem_swp_set(info, entry, swap.val);
shmem_swp_unmap(entry);
spin_unlock(&info->lock);
@@ -982,6 +985,9 @@ static int shmem_writepage(struct page *page, struct writeback_control *wbc)
list_move_tail(&info->swaplist, &shmem_swaplist);
spin_unlock(&shmem_swaplist_lock);
}
+ swap_duplicate(swap);
+ page_cache_release(page); /* pagecache ref */
+ set_page_dirty(page);
unlock_page(page);
return 0;
}
@@ -1217,13 +1223,15 @@ repeat:
SetPageUptodate(filepage);
set_page_dirty(filepage);
swap_free(swap);
- } else if (!(error = move_from_swap_cache(
- swappage, idx, mapping))) {
+ } else if (!(error = add_to_page_cache(
+ swappage, mapping, idx, GFP_ATOMIC))) {
info->flags |= SHMEM_PAGEIN;
shmem_swp_set(info, entry, 0);
shmem_swp_unmap(entry);
+ delete_from_swap_cache(swappage);
spin_unlock(&info->lock);
filepage = swappage;
+ set_page_dirty(filepage);
swap_free(swap);
} else {
shmem_swp_unmap(entry);