return ret;
}
-static void ocfs2_dio_end_io(struct kiocb *iocb,
- loff_t offset,
- ssize_t bytes,
- void *private)
+ struct ocfs2_dio_write_ctxt {
+ struct list_head dw_zero_list;
+ unsigned dw_zero_count;
+ int dw_orphaned;
+ pid_t dw_writer_pid;
+ };
+
+ static struct ocfs2_dio_write_ctxt *
+ ocfs2_dio_alloc_write_ctx(struct buffer_head *bh, int *alloc)
+ {
+ struct ocfs2_dio_write_ctxt *dwc = NULL;
+
+ if (bh->b_private)
+ return bh->b_private;
+
+ dwc = kmalloc(sizeof(struct ocfs2_dio_write_ctxt), GFP_NOFS);
+ if (dwc == NULL)
+ return NULL;
+ INIT_LIST_HEAD(&dwc->dw_zero_list);
+ dwc->dw_zero_count = 0;
+ dwc->dw_orphaned = 0;
+ dwc->dw_writer_pid = task_pid_nr(current);
+ bh->b_private = dwc;
+ *alloc = 1;
+
+ return dwc;
+ }
+
+ static void ocfs2_dio_free_write_ctx(struct inode *inode,
+ struct ocfs2_dio_write_ctxt *dwc)
+ {
+ ocfs2_free_unwritten_list(inode, &dwc->dw_zero_list);
+ kfree(dwc);
+ }
+
+ /*
+ * TODO: Make this into a generic get_blocks function.
+ *
+ * From do_direct_io in direct-io.c:
+ * "So what we do is to permit the ->get_blocks function to populate
+ * bh.b_size with the size of IO which is permitted at this offset and
+ * this i_blkbits."
+ *
+ * This function is called directly from get_more_blocks in direct-io.c.
+ *
+ * called like this: dio->get_blocks(dio->inode, fs_startblk,
+ * fs_count, map_bh, dio->rw == WRITE);
+ */
+ static int ocfs2_dio_get_block(struct inode *inode, sector_t iblock,
+ struct buffer_head *bh_result, int create)
+ {
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+ struct ocfs2_inode_info *oi = OCFS2_I(inode);
+ struct ocfs2_write_ctxt *wc;
+ struct ocfs2_write_cluster_desc *desc = NULL;
+ struct ocfs2_dio_write_ctxt *dwc = NULL;
+ struct buffer_head *di_bh = NULL;
+ u64 p_blkno;
+ loff_t pos = iblock << inode->i_sb->s_blocksize_bits;
+ unsigned len, total_len = bh_result->b_size;
+ int ret = 0, first_get_block = 0;
+
+ len = osb->s_clustersize - (pos & (osb->s_clustersize - 1));
+ len = min(total_len, len);
+
+ mlog(0, "get block of %lu at %llu:%u req %u\n",
+ inode->i_ino, pos, len, total_len);
+
+ /*
+ * Because we need to change file size in ocfs2_dio_end_io_write(), or
+ * we may need to add it to orphan dir. So can not fall to fast path
+ * while file size will be changed.
+ */
+ if (pos + total_len <= i_size_read(inode)) {
+ down_read(&oi->ip_alloc_sem);
+ /* This is the fast path for re-write. */
+ ret = ocfs2_get_block(inode, iblock, bh_result, create);
+
+ up_read(&oi->ip_alloc_sem);
+
+ if (buffer_mapped(bh_result) &&
+ !buffer_new(bh_result) &&
+ ret == 0)
+ goto out;
+
+ /* Clear state set by ocfs2_get_block. */
+ bh_result->b_state = 0;
+ }
+
+ dwc = ocfs2_dio_alloc_write_ctx(bh_result, &first_get_block);
+ if (unlikely(dwc == NULL)) {
+ ret = -ENOMEM;
+ mlog_errno(ret);
+ goto out;
+ }
+
+ if (ocfs2_clusters_for_bytes(inode->i_sb, pos + total_len) >
+ ocfs2_clusters_for_bytes(inode->i_sb, i_size_read(inode)) &&
+ !dwc->dw_orphaned) {
+ /*
+ * when we are going to alloc extents beyond file size, add the
+ * inode to orphan dir, so we can recall those spaces when
+ * system crashed during write.
+ */
+ ret = ocfs2_add_inode_to_orphan(osb, inode);
+ if (ret < 0) {
+ mlog_errno(ret);
+ goto out;
+ }
+ dwc->dw_orphaned = 1;
+ }
+
+ ret = ocfs2_inode_lock(inode, &di_bh, 1);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ down_write(&oi->ip_alloc_sem);
+
+ if (first_get_block) {
+ if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
+ ret = ocfs2_zero_tail(inode, di_bh, pos);
+ else
+ ret = ocfs2_expand_nonsparse_inode(inode, di_bh, pos,
+ total_len, NULL);
+ if (ret < 0) {
+ mlog_errno(ret);
+ goto unlock;
+ }
+ }
+
+ ret = ocfs2_write_begin_nolock(inode->i_mapping, pos, len,
+ OCFS2_WRITE_DIRECT, NULL,
+ (void **)&wc, di_bh, NULL);
+ if (ret) {
+ mlog_errno(ret);
+ goto unlock;
+ }
+
+ desc = &wc->w_desc[0];
+
+ p_blkno = ocfs2_clusters_to_blocks(inode->i_sb, desc->c_phys);
+ BUG_ON(p_blkno == 0);
+ p_blkno += iblock & (u64)(ocfs2_clusters_to_blocks(inode->i_sb, 1) - 1);
+
+ map_bh(bh_result, inode->i_sb, p_blkno);
+ bh_result->b_size = len;
+ if (desc->c_needs_zero)
+ set_buffer_new(bh_result);
+
+ /* May sleep in end_io. It should not happen in a irq context. So defer
+ * it to dio work queue. */
+ set_buffer_defer_completion(bh_result);
+
+ if (!list_empty(&wc->w_unwritten_list)) {
+ struct ocfs2_unwritten_extent *ue = NULL;
+
+ ue = list_first_entry(&wc->w_unwritten_list,
+ struct ocfs2_unwritten_extent,
+ ue_node);
+ BUG_ON(ue->ue_cpos != desc->c_cpos);
+ /* The physical address may be 0, fill it. */
+ ue->ue_phys = desc->c_phys;
+
+ list_splice_tail_init(&wc->w_unwritten_list, &dwc->dw_zero_list);
+ dwc->dw_zero_count++;
+ }
+
+ ret = ocfs2_write_end_nolock(inode->i_mapping, pos, len, len, NULL, wc);
+ BUG_ON(ret != len);
+ ret = 0;
+ unlock:
+ up_write(&oi->ip_alloc_sem);
+ ocfs2_inode_unlock(inode, 1);
+ brelse(di_bh);
+ out:
+ if (ret < 0)
+ ret = -EIO;
+ return ret;
+ }
+
+ static void ocfs2_dio_end_io_write(struct inode *inode,
+ struct ocfs2_dio_write_ctxt *dwc,
+ loff_t offset,
+ ssize_t bytes)
+ {
+ struct ocfs2_cached_dealloc_ctxt dealloc;
+ struct ocfs2_extent_tree et;
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+ struct ocfs2_inode_info *oi = OCFS2_I(inode);
+ struct ocfs2_unwritten_extent *ue = NULL;
+ struct buffer_head *di_bh = NULL;
+ struct ocfs2_dinode *di;
+ struct ocfs2_alloc_context *data_ac = NULL;
+ struct ocfs2_alloc_context *meta_ac = NULL;
+ handle_t *handle = NULL;
+ loff_t end = offset + bytes;
+ int ret = 0, credits = 0, locked = 0;
+
+ ocfs2_init_dealloc_ctxt(&dealloc);
+
+ /* We do clear unwritten, delete orphan, change i_size here. If neither
+ * of these happen, we can skip all this. */
+ if (list_empty(&dwc->dw_zero_list) &&
+ end <= i_size_read(inode) &&
+ !dwc->dw_orphaned)
+ goto out;
+
+ /* ocfs2_file_write_iter will get i_mutex, so we need not lock if we
+ * are in that context. */
+ if (dwc->dw_writer_pid != task_pid_nr(current)) {
+ mutex_lock(&inode->i_mutex);
+ locked = 1;
+ }
+
+ ret = ocfs2_inode_lock(inode, &di_bh, 1);
+ if (ret < 0) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ down_write(&oi->ip_alloc_sem);
+
+ /* Delete orphan before acquire i_mutex. */
+ if (dwc->dw_orphaned) {
+ BUG_ON(dwc->dw_writer_pid != task_pid_nr(current));
+
+ end = end > i_size_read(inode) ? end : 0;
+
+ ret = ocfs2_del_inode_from_orphan(osb, inode, di_bh,
+ !!end, end);
+ if (ret < 0)
+ mlog_errno(ret);
+ }
+
+ di = (struct ocfs2_dinode *)di_bh;
+
+ ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), di_bh);
+
+ ret = ocfs2_lock_allocators(inode, &et, 0, dwc->dw_zero_count*2,
+ &data_ac, &meta_ac);
+ if (ret) {
+ mlog_errno(ret);
+ goto unlock;
+ }
+
+ credits = ocfs2_calc_extend_credits(inode->i_sb, &di->id2.i_list);
+
+ handle = ocfs2_start_trans(osb, credits);
+ if (IS_ERR(handle)) {
+ ret = PTR_ERR(handle);
+ mlog_errno(ret);
+ goto unlock;
+ }
+ ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ if (ret) {
+ mlog_errno(ret);
+ goto commit;
+ }
+
+ list_for_each_entry(ue, &dwc->dw_zero_list, ue_node) {
+ ret = ocfs2_mark_extent_written(inode, &et, handle,
+ ue->ue_cpos, 1,
+ ue->ue_phys,
+ meta_ac, &dealloc);
+ if (ret < 0) {
+ mlog_errno(ret);
+ break;
+ }
+ }
+
+ if (end > i_size_read(inode)) {
+ ret = ocfs2_set_inode_size(handle, inode, di_bh, end);
+ if (ret < 0)
+ mlog_errno(ret);
+ }
+ commit:
+ ocfs2_commit_trans(osb, handle);
+ unlock:
+ up_write(&oi->ip_alloc_sem);
+ ocfs2_inode_unlock(inode, 1);
+ brelse(di_bh);
+ out:
+ if (data_ac)
+ ocfs2_free_alloc_context(data_ac);
+ if (meta_ac)
+ ocfs2_free_alloc_context(meta_ac);
+ ocfs2_run_deallocs(osb, &dealloc);
+ if (locked)
+ mutex_unlock(&inode->i_mutex);
+ ocfs2_dio_free_write_ctx(inode, dwc);
+ }
+
+ /*
+ * ocfs2_dio_end_io is called by the dio core when a dio is finished. We're
+ * particularly interested in the aio/dio case. We use the rw_lock DLM lock
+ * to protect io on one node from truncation on another.
+ */
++static int ocfs2_dio_end_io(struct kiocb *iocb,
++ loff_t offset,
++ ssize_t bytes,
++ void *private)
+ {
+ struct inode *inode = file_inode(iocb->ki_filp);
+ int level;
+
++ if (bytes <= 0)
++ return 0;
++
+ /* this io's submitter should not have unlocked this before we could */
+ BUG_ON(!ocfs2_iocb_is_rw_locked(iocb));
+
+ if (private)
+ ocfs2_dio_end_io_write(inode, private, offset, bytes);
+
+ ocfs2_iocb_clear_rw_locked(iocb);
+
+ level = ocfs2_iocb_rw_locked_level(iocb);
+ ocfs2_rw_unlock(inode, level);
++
++ return 0;
+ }
+
+ static ssize_t ocfs2_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
+ loff_t offset)
+ {
+ struct file *file = iocb->ki_filp;
+ struct inode *inode = file_inode(file)->i_mapping->host;
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+ loff_t end = offset + iter->count;
+ get_block_t *get_block;
+
+ /*
+ * Fallback to buffered I/O if we see an inode without
+ * extents.
+ */
+ if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
+ return 0;
+
+ /* Fallback to buffered I/O if we do not support append dio. */
+ if (end > i_size_read(inode) && !ocfs2_supports_append_dio(osb))
+ return 0;
+
+ if (iov_iter_rw(iter) == READ)
+ get_block = ocfs2_get_block;
+ else
+ get_block = ocfs2_dio_get_block;
+
+ return __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev,
+ iter, offset, get_block,
+ ocfs2_dio_end_io, NULL, 0);
+ }
+
const struct address_space_operations ocfs2_aops = {
.readpage = ocfs2_readpage,
.readpages = ocfs2_readpages,
projects / karo-tx-linux.git / commitdiff