From: Jeff Layton <jlayton@xxxxxxxxxx>
Encrypted files will need to be dealt with in block-sized chunks and
once we do that, the way that ceph_sync_write aligns the data in the
bounce buffer won't be acceptable.
Change it to align the data the same way it would be aligned in the
pagecache.
Tested-by: Luís Henriques <lhenriques@xxxxxxx>
Tested-by: Venky Shankar <vshankar@xxxxxxxxxx>
Reviewed-by: Luís Henriques <lhenriques@xxxxxxx>
Reviewed-by: Xiubo Li <xiubli@xxxxxxxxxx>
Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
---
fs/ceph/file.c | 20 ++++++++++----------
1 file changed, 10 insertions(+), 10 deletions(-)
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 70c9b9d7dc33..c9d83e87e58a 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -1579,6 +1579,7 @@ ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
bool check_caps = false;
struct timespec64 mtime = current_time(inode);
size_t count = iov_iter_count(from);
+ size_t off;
if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
return -EROFS;
@@ -1616,12 +1617,7 @@ ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
break;
}
- /*
- * write from beginning of first page,
- * regardless of io alignment
- */
- num_pages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
-
+ num_pages = calc_pages_for(pos, len);
pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
if (IS_ERR(pages)) {
ret = PTR_ERR(pages);
@@ -1629,9 +1625,12 @@ ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
}
left = len;
+ off = offset_in_page(pos);
for (n = 0; n < num_pages; n++) {
- size_t plen = min_t(size_t, left, PAGE_SIZE);
- ret = copy_page_from_iter(pages[n], 0, plen, from);
+ size_t plen = min_t(size_t, left, PAGE_SIZE - off);
+
+ ret = copy_page_from_iter(pages[n], off, plen, from);
+ off = 0;
if (ret != plen) {
ret = -EFAULT;
break;
@@ -1646,8 +1645,9 @@ ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
req->r_inode = inode;
- osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0,
- false, true);
+ osd_req_op_extent_osd_data_pages(req, 0, pages, len,
+ offset_in_page(pos),
+ false, true);
req->r_mtime = mtime;
ceph_osdc_start_request(&fsc->client->osdc, req);
--
2.39.2
