ceph: fix reading inline data when i_size > PAGE_SIZE
when inode has inline data but its size > PAGE_SIZE (it was truncated
to larger size), previous direct read code return -EIO. This patch adds
code to return zeros for data whose offset > PAGE_SIZE.
Signed-off-by: Yan, Zheng <zyan@redhat.com>
diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index c81c0e00..7d05e37 100644
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -196,17 +196,22 @@
u64 len = PAGE_CACHE_SIZE;
if (off >= i_size_read(inode)) {
- zero_user_segment(page, err, PAGE_CACHE_SIZE);
+ zero_user_segment(page, 0, PAGE_CACHE_SIZE);
SetPageUptodate(page);
return 0;
}
- /*
- * Uptodate inline data should have been added into page cache
- * while getting Fcr caps.
- */
- if (ci->i_inline_version != CEPH_INLINE_NONE)
- return -EINVAL;
+ if (ci->i_inline_version != CEPH_INLINE_NONE) {
+ /*
+ * Uptodate inline data should have been added
+ * into page cache while getting Fcr caps.
+ */
+ if (off == 0)
+ return -EINVAL;
+ zero_user_segment(page, 0, PAGE_CACHE_SIZE);
+ SetPageUptodate(page);
+ return 0;
+ }
err = ceph_readpage_from_fscache(inode, page);
if (err == 0)
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 663da44..c407abb 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -879,28 +879,34 @@
i_size = i_size_read(inode);
if (retry_op == READ_INLINE) {
- /* does not support inline data > PAGE_SIZE */
- if (i_size > PAGE_CACHE_SIZE) {
- ret = -EIO;
- } else if (iocb->ki_pos < i_size) {
+ BUG_ON(ret > 0 || read > 0);
+ if (iocb->ki_pos < i_size &&
+ iocb->ki_pos < PAGE_CACHE_SIZE) {
loff_t end = min_t(loff_t, i_size,
iocb->ki_pos + len);
+ end = min_t(loff_t, end, PAGE_CACHE_SIZE);
if (statret < end)
zero_user_segment(page, statret, end);
ret = copy_page_to_iter(page,
iocb->ki_pos & ~PAGE_MASK,
end - iocb->ki_pos, to);
iocb->ki_pos += ret;
- } else {
- ret = 0;
+ read += ret;
+ }
+ if (iocb->ki_pos < i_size && read < len) {
+ size_t zlen = min_t(size_t, len - read,
+ i_size - iocb->ki_pos);
+ ret = iov_iter_zero(zlen, to);
+ iocb->ki_pos += ret;
+ read += ret;
}
__free_pages(page, 0);
- return ret;
+ return read;
}
/* hit EOF or hole? */
if (retry_op == CHECK_EOF && iocb->ki_pos < i_size &&
- ret < len) {
+ ret < len) {
dout("sync_read hit hole, ppos %lld < size %lld"
", reading more\n", iocb->ki_pos,
inode->i_size);