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7c673cae FG |
1 | // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- |
2 | // vim: ts=8 sw=2 smarttab | |
3 | ||
4 | #include "rbd_replay/BufferReader.h" | |
11fdf7f2 | 5 | #include "include/ceph_assert.h" |
7c673cae FG |
6 | #include "include/intarith.h" |
7 | ||
8 | namespace rbd_replay { | |
9 | ||
10 | BufferReader::BufferReader(int fd, size_t min_bytes, size_t max_bytes) | |
11 | : m_fd(fd), m_min_bytes(min_bytes), m_max_bytes(max_bytes), | |
12 | m_bl_it(m_bl.begin()), m_eof_reached(false) { | |
11fdf7f2 | 13 | ceph_assert(m_min_bytes <= m_max_bytes); |
7c673cae FG |
14 | } |
15 | ||
11fdf7f2 | 16 | int BufferReader::fetch(bufferlist::const_iterator **it) { |
7c673cae | 17 | if (m_bl_it.get_remaining() < m_min_bytes) { |
11fdf7f2 | 18 | ssize_t bytes_to_read = round_up_to(m_max_bytes - m_bl_it.get_remaining(), |
7c673cae FG |
19 | CEPH_PAGE_SIZE); |
20 | while (!m_eof_reached && bytes_to_read > 0) { | |
21 | int r = m_bl.read_fd(m_fd, CEPH_PAGE_SIZE); | |
22 | if (r < 0) { | |
23 | return r; | |
24 | } | |
25 | if (r == 0) { | |
26 | m_eof_reached = true; | |
27 | } | |
11fdf7f2 | 28 | ceph_assert(r <= bytes_to_read); |
7c673cae FG |
29 | bytes_to_read -= r; |
30 | } | |
31 | } | |
32 | ||
33 | *it = &m_bl_it; | |
34 | return 0; | |
35 | } | |
36 | ||
37 | } // namespace rbd_replay |