[PATCH v13 53/59] ceph: align data in pages in ceph_sync_write

Jeff Layton
2022-04-05T20:23:26Z

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.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
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 41b97d32dfcf..69ac67c93552 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -1551,6 +1551,7 @@ 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;
@@ -1588,12 +1589,7 @@ 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);
@@ -1601,9 +1597,12 @@ 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;
@@ -1618,8 +1617,9 @@ 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;
ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
--
2.35.1