diff options
| -rw-r--r-- | fs/ceph/addr.c | 137 |
1 files changed, 80 insertions, 57 deletions
diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c index b6ac3da9ddab..03a1ee27b33c 100644 --- a/fs/ceph/addr.c +++ b/fs/ceph/addr.c @@ -463,14 +463,20 @@ out: return rc; } +struct ceph_writeback_ctl +{ + loff_t i_size; + u64 truncate_size; + u32 truncate_seq; + bool size_stable; +}; + /* * Get ref for the oldest snapc for an inode with dirty data... that is, the * only snap context we are allowed to write back. */ -static struct ceph_snap_context *get_oldest_context(struct inode *inode, - loff_t *snap_size, - u64 *truncate_size, - u32 *truncate_seq) +static struct ceph_snap_context * +get_oldest_context(struct inode *inode, struct ceph_writeback_ctl *ctl) { struct ceph_inode_info *ci = ceph_inode(inode); struct ceph_snap_context *snapc = NULL; @@ -482,12 +488,17 @@ static struct ceph_snap_context *get_oldest_context(struct inode *inode, capsnap->context, capsnap->dirty_pages); if (capsnap->dirty_pages) { snapc = ceph_get_snap_context(capsnap->context); - if (snap_size) - *snap_size = capsnap->size; - if (truncate_size) - *truncate_size = capsnap->truncate_size; - if (truncate_seq) - *truncate_seq = capsnap->truncate_seq; + if (ctl) { + if (capsnap->writing) { + ctl->i_size = i_size_read(inode); + ctl->size_stable = false; + } else { + ctl->i_size = capsnap->size; + ctl->size_stable = true; + } + ctl->truncate_size = capsnap->truncate_size; + ctl->truncate_seq = capsnap->truncate_seq; + } break; } } @@ -495,15 +506,44 @@ static struct ceph_snap_context *get_oldest_context(struct inode *inode, snapc = ceph_get_snap_context(ci->i_head_snapc); dout(" head snapc %p has %d dirty pages\n", snapc, ci->i_wrbuffer_ref_head); - if (truncate_size) - *truncate_size = ci->i_truncate_size; - if (truncate_seq) - *truncate_seq = ci->i_truncate_seq; + if (ctl) { + ctl->i_size = i_size_read(inode); + ctl->truncate_size = ci->i_truncate_size; + ctl->truncate_seq = ci->i_truncate_seq; + ctl->size_stable = false; + } } spin_unlock(&ci->i_ceph_lock); return snapc; } +static u64 get_writepages_data_length(struct inode *inode, + struct page *page, u64 start) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_snap_context *snapc = page_snap_context(page); + struct ceph_cap_snap *capsnap = NULL; + u64 end = i_size_read(inode); + + if (snapc != ci->i_head_snapc) { + bool found = false; + spin_lock(&ci->i_ceph_lock); + list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { + if (capsnap->context == snapc) { + if (!capsnap->writing) + end = capsnap->size; + found = true; + break; + } + } + spin_unlock(&ci->i_ceph_lock); + WARN_ON(!found); + } + if (end > page_offset(page) + PAGE_SIZE) + end = page_offset(page) + PAGE_SIZE; + return end > start ? end - start : 0; +} + /* * Write a single page, but leave the page locked. * @@ -515,21 +555,17 @@ static int writepage_nounlock(struct page *page, struct writeback_control *wbc) struct inode *inode; struct ceph_inode_info *ci; struct ceph_fs_client *fsc; - struct ceph_osd_client *osdc; struct ceph_snap_context *snapc, *oldest; loff_t page_off = page_offset(page); - loff_t snap_size = -1; long writeback_stat; - u64 truncate_size; - u32 truncate_seq; int err, len = PAGE_SIZE; + struct ceph_writeback_ctl ceph_wbc; dout("writepage %p idx %lu\n", page, page->index); inode = page->mapping->host; ci = ceph_inode(inode); fsc = ceph_inode_to_client(inode); - osdc = &fsc->client->osdc; /* verify this is a writeable snap context */ snapc = page_snap_context(page); @@ -537,8 +573,7 @@ static int writepage_nounlock(struct page *page, struct writeback_control *wbc) dout("writepage %p page %p not dirty?\n", inode, page); return 0; } - oldest = get_oldest_context(inode, &snap_size, - &truncate_size, &truncate_seq); + oldest = get_oldest_context(inode, &ceph_wbc); if (snapc->seq > oldest->seq) { dout("writepage %p page %p snapc %p not writeable - noop\n", inode, page, snapc); @@ -550,17 +585,14 @@ static int writepage_nounlock(struct page *page, struct writeback_control *wbc) } ceph_put_snap_context(oldest); - if (snap_size == -1) - snap_size = i_size_read(inode); - /* is this a partial page at end of file? */ - if (page_off >= snap_size) { - dout("%p page eof %llu\n", page, snap_size); + if (page_off >= ceph_wbc.i_size) { + dout("%p page eof %llu\n", page, ceph_wbc.i_size); return 0; } - if (snap_size < page_off + len) - len = snap_size - page_off; + if (ceph_wbc.i_size < page_off + len) + len = ceph_wbc.i_size - page_off; dout("writepage %p page %p index %lu on %llu~%u snapc %p seq %lld\n", inode, page, page->index, page_off, len, snapc, snapc->seq); @@ -571,10 +603,10 @@ static int writepage_nounlock(struct page *page, struct writeback_control *wbc) set_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC); set_page_writeback(page); - err = ceph_osdc_writepages(osdc, ceph_vino(inode), - &ci->i_layout, snapc, - page_off, len, - truncate_seq, truncate_size, + err = ceph_osdc_writepages(&fsc->client->osdc, ceph_vino(inode), + &ci->i_layout, snapc, page_off, len, + ceph_wbc.truncate_seq, + ceph_wbc.truncate_size, &inode->i_mtime, &page, 1); if (err < 0) { struct writeback_control tmp_wbc; @@ -745,9 +777,7 @@ static int ceph_writepages_start(struct address_space *mapping, int rc = 0; unsigned int wsize = i_blocksize(inode); struct ceph_osd_request *req = NULL; - loff_t snap_size, i_size; - u64 truncate_size; - u32 truncate_seq; + struct ceph_writeback_ctl ceph_wbc; dout("writepages_start %p (mode=%s)\n", inode, wbc->sync_mode == WB_SYNC_NONE ? "NONE" : @@ -786,9 +816,7 @@ static int ceph_writepages_start(struct address_space *mapping, retry: /* find oldest snap context with dirty data */ ceph_put_snap_context(snapc); - snap_size = -1; - snapc = get_oldest_context(inode, &snap_size, - &truncate_size, &truncate_seq); + snapc = get_oldest_context(inode, &ceph_wbc); if (!snapc) { /* hmm, why does writepages get called when there is no dirty data? */ @@ -798,8 +826,6 @@ retry: dout(" oldest snapc is %p seq %lld (%d snaps)\n", snapc, snapc->seq, snapc->num_snaps); - i_size = i_size_read(inode); - if (last_snapc && snapc != last_snapc) { /* if we switched to a newer snapc, restart our scan at the * start of the original file range. */ @@ -865,10 +891,9 @@ get_more_pages: dout("waiting on writeback %p\n", page); wait_on_page_writeback(page); } - if (page_offset(page) >= - (snap_size == -1 ? i_size : snap_size)) { - dout("%p page eof %llu\n", page, - (snap_size == -1 ? i_size : snap_size)); + if (page_offset(page) >= ceph_wbc.i_size) { + dout("%p page eof %llu\n", + page, ceph_wbc.i_size); done = 1; unlock_page(page); break; @@ -996,10 +1021,9 @@ new_request: req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, vino, offset, &len, 0, num_ops, - CEPH_OSD_OP_WRITE, - CEPH_OSD_FLAG_WRITE, - snapc, truncate_seq, - truncate_size, false); + CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE, + snapc, ceph_wbc.truncate_seq, + ceph_wbc.truncate_size, false); if (IS_ERR(req)) { req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, vino, @@ -1008,8 +1032,8 @@ new_request: CEPH_OSD_SLAB_OPS), CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE, - snapc, truncate_seq, - truncate_size, true); + snapc, ceph_wbc.truncate_seq, + ceph_wbc.truncate_size, true); BUG_ON(IS_ERR(req)); } BUG_ON(len < page_offset(pages[locked_pages - 1]) + @@ -1046,14 +1070,15 @@ new_request: len += PAGE_SIZE; } - if (snap_size != -1) { - len = min(len, snap_size - offset); + if (ceph_wbc.size_stable) { + len = min(len, ceph_wbc.i_size - offset); } else if (i == locked_pages) { /* writepages_finish() clears writeback pages * according to the data length, so make sure * data length covers all locked pages */ u64 min_len = len + 1 - PAGE_SIZE; - len = min(len, (u64)i_size_read(inode) - offset); + len = get_writepages_data_length(inode, pages[i - 1], + offset); len = max(len, min_len); } dout("writepages got pages at %llu~%llu\n", offset, len); @@ -1137,8 +1162,7 @@ out: static int context_is_writeable_or_written(struct inode *inode, struct ceph_snap_context *snapc) { - struct ceph_snap_context *oldest = get_oldest_context(inode, NULL, - NULL, NULL); + struct ceph_snap_context *oldest = get_oldest_context(inode, NULL); int ret = !oldest || snapc->seq <= oldest->seq; ceph_put_snap_context(oldest); @@ -1183,8 +1207,7 @@ retry_locked: * this page is already dirty in another (older) snap * context! is it writeable now? */ - oldest = get_oldest_context(inode, NULL, NULL, NULL); - + oldest = get_oldest_context(inode, NULL); if (snapc->seq > oldest->seq) { ceph_put_snap_context(oldest); dout(" page %p snapc %p not current or oldest\n", |