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authorNeilBrown <neilb@suse.de>2022-05-10 04:20:49 +0300
committerakpm <akpm@linux-foundation.org>2022-05-10 04:20:49 +0300
commita1a0dfd56f97738c1974976309bbf38bb5a21132 (patch)
tree2f4aa69a0ba85c406ada1759cd57d9695d0417d9 /mm/page_io.c
parent2282679fb20bf036a714ed49fadd0230c278a203 (diff)
downloadlinux-a1a0dfd56f97738c1974976309bbf38bb5a21132.tar.xz
mm: handle THP in swap_*page_fs()
Pages passed to swap_readpage()/swap_writepage() are not necessarily all the same size - there may be transparent-huge-pages involves. The BIO paths of swap_*page() handle this correctly, but the SWP_FS_OPS path does not. So we need to use thp_size() to find the size, not just assume PAGE_SIZE, and we need to track the total length of the request, not just assume it is "page * PAGE_SIZE". Link: https://lkml.kernel.org/r/165119301488.15698.9457662928942765453.stgit@noble.brown Signed-off-by: NeilBrown <neilb@suse.de> Reported-by: Miaohe Lin <linmiaohe@huawei.com> Cc: Christoph Hellwig <hch@lst.de> Cc: David Howells <dhowells@redhat.com> Cc: Geert Uytterhoeven <geert+renesas@glider.be> Cc: Hugh Dickins <hughd@google.com> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/page_io.c')
-rw-r--r--mm/page_io.c23
1 files changed, 13 insertions, 10 deletions
diff --git a/mm/page_io.c b/mm/page_io.c
index c132511f521c..d636a3531cad 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -239,6 +239,7 @@ struct swap_iocb {
struct kiocb iocb;
struct bio_vec bvec[SWAP_CLUSTER_MAX];
int pages;
+ int len;
};
static mempool_t *sio_pool;
@@ -261,7 +262,7 @@ static void sio_write_complete(struct kiocb *iocb, long ret)
struct page *page = sio->bvec[0].bv_page;
int p;
- if (ret != PAGE_SIZE * sio->pages) {
+ if (ret != sio->len) {
/*
* In the case of swap-over-nfs, this can be a
* temporary failure if the system has limited
@@ -301,7 +302,7 @@ static int swap_writepage_fs(struct page *page, struct writeback_control *wbc)
sio = *wbc->swap_plug;
if (sio) {
if (sio->iocb.ki_filp != swap_file ||
- sio->iocb.ki_pos + sio->pages * PAGE_SIZE != pos) {
+ sio->iocb.ki_pos + sio->len != pos) {
swap_write_unplug(sio);
sio = NULL;
}
@@ -312,10 +313,12 @@ static int swap_writepage_fs(struct page *page, struct writeback_control *wbc)
sio->iocb.ki_complete = sio_write_complete;
sio->iocb.ki_pos = pos;
sio->pages = 0;
+ sio->len = 0;
}
sio->bvec[sio->pages].bv_page = page;
- sio->bvec[sio->pages].bv_len = PAGE_SIZE;
+ sio->bvec[sio->pages].bv_len = thp_size(page);
sio->bvec[sio->pages].bv_offset = 0;
+ sio->len += thp_size(page);
sio->pages += 1;
if (sio->pages == ARRAY_SIZE(sio->bvec) || !wbc->swap_plug) {
swap_write_unplug(sio);
@@ -371,8 +374,7 @@ void swap_write_unplug(struct swap_iocb *sio)
struct address_space *mapping = sio->iocb.ki_filp->f_mapping;
int ret;
- iov_iter_bvec(&from, WRITE, sio->bvec, sio->pages,
- PAGE_SIZE * sio->pages);
+ iov_iter_bvec(&from, WRITE, sio->bvec, sio->pages, sio->len);
ret = mapping->a_ops->swap_rw(&sio->iocb, &from);
if (ret != -EIOCBQUEUED)
sio_write_complete(&sio->iocb, ret);
@@ -383,7 +385,7 @@ static void sio_read_complete(struct kiocb *iocb, long ret)
struct swap_iocb *sio = container_of(iocb, struct swap_iocb, iocb);
int p;
- if (ret == PAGE_SIZE * sio->pages) {
+ if (ret == sio->len) {
for (p = 0; p < sio->pages; p++) {
struct page *page = sio->bvec[p].bv_page;
@@ -415,7 +417,7 @@ static void swap_readpage_fs(struct page *page,
sio = *plug;
if (sio) {
if (sio->iocb.ki_filp != sis->swap_file ||
- sio->iocb.ki_pos + sio->pages * PAGE_SIZE != pos) {
+ sio->iocb.ki_pos + sio->len != pos) {
swap_read_unplug(sio);
sio = NULL;
}
@@ -426,10 +428,12 @@ static void swap_readpage_fs(struct page *page,
sio->iocb.ki_pos = pos;
sio->iocb.ki_complete = sio_read_complete;
sio->pages = 0;
+ sio->len = 0;
}
sio->bvec[sio->pages].bv_page = page;
- sio->bvec[sio->pages].bv_len = PAGE_SIZE;
+ sio->bvec[sio->pages].bv_len = thp_size(page);
sio->bvec[sio->pages].bv_offset = 0;
+ sio->len += thp_size(page);
sio->pages += 1;
if (sio->pages == ARRAY_SIZE(sio->bvec) || !plug) {
swap_read_unplug(sio);
@@ -521,8 +525,7 @@ void __swap_read_unplug(struct swap_iocb *sio)
struct address_space *mapping = sio->iocb.ki_filp->f_mapping;
int ret;
- iov_iter_bvec(&from, READ, sio->bvec, sio->pages,
- PAGE_SIZE * sio->pages);
+ iov_iter_bvec(&from, READ, sio->bvec, sio->pages, sio->len);
ret = mapping->a_ops->swap_rw(&sio->iocb, &from);
if (ret != -EIOCBQUEUED)
sio_read_complete(&sio->iocb, ret);