diff options
Diffstat (limited to 'fs/ocfs2/aops.c')
| -rw-r--r-- | fs/ocfs2/aops.c | 863 |
1 files changed, 346 insertions, 517 deletions
diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c index c29d066..578ce22 100644 --- a/fs/ocfs2/aops.c +++ b/fs/ocfs2/aops.c @@ -499,158 +499,6 @@ bail: return status; } -/* - * 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_direct_IO_get_blocks(struct inode *inode, sector_t iblock, - struct buffer_head *bh_result, int create) -{ - int ret; - u32 cpos = 0; - int alloc_locked = 0; - u64 p_blkno, inode_blocks, contig_blocks; - unsigned int ext_flags; - unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits; - unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits; - unsigned long len = bh_result->b_size; - unsigned int clusters_to_alloc = 0, contig_clusters = 0; - - cpos = ocfs2_blocks_to_clusters(inode->i_sb, iblock); - - /* This function won't even be called if the request isn't all - * nicely aligned and of the right size, so there's no need - * for us to check any of that. */ - - inode_blocks = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode)); - - down_read(&OCFS2_I(inode)->ip_alloc_sem); - - /* This figures out the size of the next contiguous block, and - * our logical offset */ - ret = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, - &contig_blocks, &ext_flags); - up_read(&OCFS2_I(inode)->ip_alloc_sem); - - if (ret) { - mlog(ML_ERROR, "get_blocks() failed iblock=%llu\n", - (unsigned long long)iblock); - ret = -EIO; - goto bail; - } - - /* We should already CoW the refcounted extent in case of create. */ - BUG_ON(create && (ext_flags & OCFS2_EXT_REFCOUNTED)); - - /* allocate blocks if no p_blkno is found, and create == 1 */ - if (!p_blkno && create) { - ret = ocfs2_inode_lock(inode, NULL, 1); - if (ret < 0) { - mlog_errno(ret); - goto bail; - } - - alloc_locked = 1; - - down_write(&OCFS2_I(inode)->ip_alloc_sem); - - /* fill hole, allocate blocks can't be larger than the size - * of the hole */ - clusters_to_alloc = ocfs2_clusters_for_bytes(inode->i_sb, len); - contig_clusters = ocfs2_clusters_for_blocks(inode->i_sb, - contig_blocks); - if (clusters_to_alloc > contig_clusters) - clusters_to_alloc = contig_clusters; - - /* allocate extent and insert them into the extent tree */ - ret = ocfs2_extend_allocation(inode, cpos, - clusters_to_alloc, 0); - if (ret < 0) { - up_write(&OCFS2_I(inode)->ip_alloc_sem); - mlog_errno(ret); - goto bail; - } - - ret = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, - &contig_blocks, &ext_flags); - if (ret < 0) { - up_write(&OCFS2_I(inode)->ip_alloc_sem); - mlog(ML_ERROR, "get_blocks() failed iblock=%llu\n", - (unsigned long long)iblock); - ret = -EIO; - goto bail; - } - set_buffer_new(bh_result); - up_write(&OCFS2_I(inode)->ip_alloc_sem); - } - - /* - * get_more_blocks() expects us to describe a hole by clearing - * the mapped bit on bh_result(). - * - * Consider an unwritten extent as a hole. - */ - if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN)) - map_bh(bh_result, inode->i_sb, p_blkno); - else - clear_buffer_mapped(bh_result); - - /* make sure we don't map more than max_blocks blocks here as - that's all the kernel will handle at this point. */ - if (max_blocks < contig_blocks) - contig_blocks = max_blocks; - bh_result->b_size = contig_blocks << blocksize_bits; -bail: - if (alloc_locked) - ocfs2_inode_unlock(inode, 1); - return ret; -} - -/* - * 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 (ocfs2_iocb_is_unaligned_aio(iocb)) { - ocfs2_iocb_clear_unaligned_aio(iocb); - - mutex_unlock(&OCFS2_I(inode)->ip_unaligned_aio); - } - - /* Let rw unlock to be done later to protect append direct io write */ - if (offset + bytes <= i_size_read(inode)) { - ocfs2_iocb_clear_rw_locked(iocb); - - level = ocfs2_iocb_rw_locked_level(iocb); - ocfs2_rw_unlock(inode, level); - } - - return 0; -} - static int ocfs2_releasepage(struct page *page, gfp_t wait) { if (!page_has_buffers(page)) @@ -658,363 +506,6 @@ static int ocfs2_releasepage(struct page *page, gfp_t wait) return try_to_free_buffers(page); } -static int ocfs2_is_overwrite(struct ocfs2_super *osb, - struct inode *inode, loff_t offset) -{ - int ret = 0; - u32 v_cpos = 0; - u32 p_cpos = 0; - unsigned int num_clusters = 0; - unsigned int ext_flags = 0; - - v_cpos = ocfs2_bytes_to_clusters(osb->sb, offset); - ret = ocfs2_get_clusters(inode, v_cpos, &p_cpos, - &num_clusters, &ext_flags); - if (ret < 0) { - mlog_errno(ret); - return ret; - } - - if (p_cpos && !(ext_flags & OCFS2_EXT_UNWRITTEN)) - return 1; - - return 0; -} - -static int ocfs2_direct_IO_zero_extend(struct ocfs2_super *osb, - struct inode *inode, loff_t offset, - u64 zero_len, int cluster_align) -{ - u32 p_cpos = 0; - u32 v_cpos = ocfs2_bytes_to_clusters(osb->sb, i_size_read(inode)); - unsigned int num_clusters = 0; - unsigned int ext_flags = 0; - int ret = 0; - - if (offset <= i_size_read(inode) || cluster_align) - return 0; - - ret = ocfs2_get_clusters(inode, v_cpos, &p_cpos, &num_clusters, - &ext_flags); - if (ret < 0) { - mlog_errno(ret); - return ret; - } - - if (p_cpos && !(ext_flags & OCFS2_EXT_UNWRITTEN)) { - u64 s = i_size_read(inode); - sector_t sector = ((u64)p_cpos << (osb->s_clustersize_bits - 9)) + - (do_div(s, osb->s_clustersize) >> 9); - - ret = blkdev_issue_zeroout(osb->sb->s_bdev, sector, - zero_len >> 9, GFP_NOFS, false); - if (ret < 0) - mlog_errno(ret); - } - - return ret; -} - -static int ocfs2_direct_IO_extend_no_holes(struct ocfs2_super *osb, - struct inode *inode, loff_t offset) -{ - u64 zero_start, zero_len, total_zero_len; - u32 p_cpos = 0, clusters_to_add; - u32 v_cpos = ocfs2_bytes_to_clusters(osb->sb, i_size_read(inode)); - unsigned int num_clusters = 0; - unsigned int ext_flags = 0; - u32 size_div, offset_div; - int ret = 0; - - { - u64 o = offset; - u64 s = i_size_read(inode); - - offset_div = do_div(o, osb->s_clustersize); - size_div = do_div(s, osb->s_clustersize); - } - - if (offset <= i_size_read(inode)) - return 0; - - clusters_to_add = ocfs2_bytes_to_clusters(inode->i_sb, offset) - - ocfs2_bytes_to_clusters(inode->i_sb, i_size_read(inode)); - total_zero_len = offset - i_size_read(inode); - if (clusters_to_add) - total_zero_len -= offset_div; - - /* Allocate clusters to fill out holes, and this is only needed - * when we add more than one clusters. Otherwise the cluster will - * be allocated during direct IO */ - if (clusters_to_add > 1) { - ret = ocfs2_extend_allocation(inode, - OCFS2_I(inode)->ip_clusters, - clusters_to_add - 1, 0); - if (ret) { - mlog_errno(ret); - goto out; - } - } - - while (total_zero_len) { - ret = ocfs2_get_clusters(inode, v_cpos, &p_cpos, &num_clusters, - &ext_flags); - if (ret < 0) { - mlog_errno(ret); - goto out; - } - - zero_start = ocfs2_clusters_to_bytes(osb->sb, p_cpos) + - size_div; - zero_len = ocfs2_clusters_to_bytes(osb->sb, num_clusters) - - size_div; - zero_len = min(total_zero_len, zero_len); - - if (p_cpos && !(ext_flags & OCFS2_EXT_UNWRITTEN)) { - ret = blkdev_issue_zeroout(osb->sb->s_bdev, - zero_start >> 9, zero_len >> 9, - GFP_NOFS, false); - if (ret < 0) { - mlog_errno(ret); - goto out; - } - } - - total_zero_len -= zero_len; - v_cpos += ocfs2_bytes_to_clusters(osb->sb, zero_len + size_div); - - /* Only at first iteration can be cluster not aligned. - * So set size_div to 0 for the rest */ - size_div = 0; - } - -out: - return ret; -} - -static ssize_t ocfs2_direct_IO_write(struct kiocb *iocb, - struct iov_iter *iter, - loff_t offset) -{ - ssize_t ret = 0; - ssize_t written = 0; - bool orphaned = false; - int is_overwrite = 0; - struct file *file = iocb->ki_filp; - struct inode *inode = file_inode(file)->i_mapping->host; - struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); - struct buffer_head *di_bh = NULL; - size_t count = iter->count; - journal_t *journal = osb->journal->j_journal; - u64 zero_len_head, zero_len_tail; - int cluster_align_head, cluster_align_tail; - loff_t final_size = offset + count; - int append_write = offset >= i_size_read(inode) ? 1 : 0; - unsigned int num_clusters = 0; - unsigned int ext_flags = 0; - - { - u64 o = offset; - u64 s = i_size_read(inode); - - zero_len_head = do_div(o, 1 << osb->s_clustersize_bits); - cluster_align_head = !zero_len_head; - - zero_len_tail = osb->s_clustersize - - do_div(s, osb->s_clustersize); - if ((offset - i_size_read(inode)) < zero_len_tail) - zero_len_tail = offset - i_size_read(inode); - cluster_align_tail = !zero_len_tail; - } - - /* - * when final_size > inode->i_size, inode->i_size will be - * updated after direct write, so add the inode to orphan - * dir first. - */ - if (final_size > i_size_read(inode)) { - ret = ocfs2_add_inode_to_orphan(osb, inode); - if (ret < 0) { - mlog_errno(ret); - goto out; - } - orphaned = true; - } - - if (append_write) { - ret = ocfs2_inode_lock(inode, NULL, 1); - if (ret < 0) { - mlog_errno(ret); - goto clean_orphan; - } - - /* zeroing out the previously allocated cluster tail - * that but not zeroed */ - if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) { - down_read(&OCFS2_I(inode)->ip_alloc_sem); - ret = ocfs2_direct_IO_zero_extend(osb, inode, offset, - zero_len_tail, cluster_align_tail); - up_read(&OCFS2_I(inode)->ip_alloc_sem); - } else { - down_write(&OCFS2_I(inode)->ip_alloc_sem); - ret = ocfs2_direct_IO_extend_no_holes(osb, inode, - offset); - up_write(&OCFS2_I(inode)->ip_alloc_sem); - } - if (ret < 0) { - mlog_errno(ret); - ocfs2_inode_unlock(inode, 1); - goto clean_orphan; - } - - is_overwrite = ocfs2_is_overwrite(osb, inode, offset); - if (is_overwrite < 0) { - mlog_errno(is_overwrite); - ret = is_overwrite; - ocfs2_inode_unlock(inode, 1); - goto clean_orphan; - } - - ocfs2_inode_unlock(inode, 1); - } - - written = __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev, iter, - offset, ocfs2_direct_IO_get_blocks, - ocfs2_dio_end_io, NULL, 0); - /* overwrite aio may return -EIOCBQUEUED, and it is not an error */ - if ((written < 0) && (written != -EIOCBQUEUED)) { - loff_t i_size = i_size_read(inode); - - if (offset + count > i_size) { - ret = ocfs2_inode_lock(inode, &di_bh, 1); - if (ret < 0) { - mlog_errno(ret); - goto clean_orphan; - } - - if (i_size == i_size_read(inode)) { - ret = ocfs2_truncate_file(inode, di_bh, - i_size); - if (ret < 0) { - if (ret != -ENOSPC) - mlog_errno(ret); - - ocfs2_inode_unlock(inode, 1); - brelse(di_bh); - di_bh = NULL; - goto clean_orphan; - } - } - - ocfs2_inode_unlock(inode, 1); - brelse(di_bh); - di_bh = NULL; - - ret = jbd2_journal_force_commit(journal); - if (ret < 0) - mlog_errno(ret); - } - } else if (written > 0 && append_write && !is_overwrite && - !cluster_align_head) { - /* zeroing out the allocated cluster head */ - u32 p_cpos = 0; - u32 v_cpos = ocfs2_bytes_to_clusters(osb->sb, offset); - - ret = ocfs2_inode_lock(inode, NULL, 0); - if (ret < 0) { - mlog_errno(ret); - goto clean_orphan; - } - - ret = ocfs2_get_clusters(inode, v_cpos, &p_cpos, - &num_clusters, &ext_flags); - if (ret < 0) { - mlog_errno(ret); - ocfs2_inode_unlock(inode, 0); - goto clean_orphan; - } - - BUG_ON(!p_cpos || (ext_flags & OCFS2_EXT_UNWRITTEN)); - - ret = blkdev_issue_zeroout(osb->sb->s_bdev, - (u64)p_cpos << (osb->s_clustersize_bits - 9), - zero_len_head >> 9, GFP_NOFS, false); - if (ret < 0) - mlog_errno(ret); - - ocfs2_inode_unlock(inode, 0); - } - -clean_orphan: - if (orphaned) { - int tmp_ret; - int update_isize = written > 0 ? 1 : 0; - loff_t end = update_isize ? offset + written : 0; - - tmp_ret = ocfs2_inode_lock(inode, &di_bh, 1); - if (tmp_ret < 0) { - ret = tmp_ret; - mlog_errno(ret); - goto out; - } - - tmp_ret = ocfs2_del_inode_from_orphan(osb, inode, di_bh, - update_isize, end); - if (tmp_ret < 0) { - ocfs2_inode_unlock(inode, 1); - ret = tmp_ret; - mlog_errno(ret); - brelse(di_bh); - goto out; - } - - ocfs2_inode_unlock(inode, 1); - brelse(di_bh); - - tmp_ret = jbd2_journal_force_commit(journal); - if (tmp_ret < 0) { - ret = tmp_ret; - mlog_errno(tmp_ret); - } - } - -out: - if (ret >= 0) - ret = written; - return ret; -} - -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); - int full_coherency = !(osb->s_mount_opt & - OCFS2_MOUNT_COHERENCY_BUFFERED); - - /* - * 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 are appending and - * concurrent O_DIRECT writes are allowed. - */ - if (i_size_read(inode) <= offset && !full_coherency) - return 0; - - if (iov_iter_rw(iter) == READ) - return __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev, - iter, offset, - ocfs2_direct_IO_get_blocks, - ocfs2_dio_end_io, NULL, 0); - else - return ocfs2_direct_IO_write(iocb, iter, offset); -} - static void ocfs2_figure_cluster_boundaries(struct ocfs2_super *osb, u32 cpos, unsigned int *start, @@ -1326,14 +817,14 @@ static void ocfs2_free_unwritten_list(struct inode *inode, struct list_head *head) { struct ocfs2_inode_info *oi = OCFS2_I(inode); - struct ocfs2_unwritten_extent *dz = NULL, *tmp = NULL; + struct ocfs2_unwritten_extent *ue = NULL, *tmp = NULL; - list_for_each_entry_safe(dz, tmp, head, ue_node) { - list_del(&dz->ue_node); + list_for_each_entry_safe(ue, tmp, head, ue_node) { + list_del(&ue->ue_node); spin_lock(&oi->ip_lock); - list_del(&dz->ue_ip_node); + list_del(&ue->ue_ip_node); spin_unlock(&oi->ip_lock); - kfree(dz); + kfree(ue); } } @@ -1834,7 +1325,7 @@ static int ocfs2_unwritten_check(struct inode *inode, struct ocfs2_write_cluster_desc *desc) { struct ocfs2_inode_info *oi = OCFS2_I(inode); - struct ocfs2_unwritten_extent *dz = NULL, *new = NULL; + struct ocfs2_unwritten_extent *ue = NULL, *new = NULL; int ret = 0; if (!desc->c_needs_zero) @@ -1845,8 +1336,8 @@ retry: /* Needs not to zero no metter buffer or direct. The one who is zero * the cluster is doing zero. And he will clear unwritten after all * cluster io finished. */ - list_for_each_entry(dz, &oi->ip_unwritten_list, ue_ip_node) { - if (desc->c_cpos == dz->ue_cpos) { + list_for_each_entry(ue, &oi->ip_unwritten_list, ue_ip_node) { + if (desc->c_cpos == ue->ue_cpos) { BUG_ON(desc->c_new); desc->c_needs_zero = 0; desc->c_clear_unwritten = 0; @@ -2608,6 +2099,344 @@ static int ocfs2_write_end(struct file *file, struct address_space *mapping, return ret; } +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_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); + + /* This is the fast path for re-write. */ + ret = ocfs2_get_block(inode, iblock, bh_result, create); + + 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; + } + + 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: + 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_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; + + ret = ocfs2_inode_lock(inode, &di_bh, 1); + if (ret < 0) { + mlog_errno(ret); + 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; + } + + /* 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); + + 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: + ocfs2_inode_unlock(inode, 1); + brelse(di_bh); +out: + ocfs2_run_deallocs(osb, &dealloc); + if (locked) + mutex_unlock(&inode->i_mutex); + ocfs2_dio_free_write_ctx(inode, dwc); + if (data_ac) + ocfs2_free_alloc_context(data_ac); + if (meta_ac) + ocfs2_free_alloc_context(meta_ac); +} + +/* + * 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 (ocfs2_iocb_is_unaligned_aio(iocb)) { + ocfs2_iocb_clear_unaligned_aio(iocb); + + mutex_unlock(&OCFS2_I(inode)->ip_unaligned_aio); + } + + 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, |
