If the offset is larger or equal to both real file size and
max file size, then return -EFBIG.
Signed-off-by: Chengguang Xu <cgxu519@xxxxxxx>
---
fs/ceph/file.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index e588b23681e0..7a01fe627bd7 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -1387,9 +1387,11 @@ static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
struct ceph_osd_client *osdc =
&ceph_sb_to_client(inode->i_sb)->client->osdc;
struct ceph_cap_flush *prealloc_cf;
+ struct ceph_fs_client *fsc = inode->i_sb->s_fs_info;
ssize_t count, written = 0;
int err, want, got;
loff_t pos;
+ loff_t limit = max(i_size_read(inode), fsc->max_file_size);
if (ceph_snap(inode) != CEPH_NOSNAP)
return -EROFS;
@@ -1415,6 +1417,13 @@ static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
goto out;
pos = iocb->ki_pos;
+ if (unlikely(pos >= limit)) {
+ err = -EFBIG;
+ goto out;
+ } else {
+ iov_iter_truncate(from, limit - pos);
+ }
+
count = iov_iter_count(from);
if (ceph_quota_is_max_bytes_exceeded(inode, pos + count)) {
err = -EDQUOT;
--
2.17.1
--
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