diff options
Diffstat (limited to 'fs/ocfs2/file.c')
-rw-r--r-- | fs/ocfs2/file.c | 76 |
1 files changed, 71 insertions, 5 deletions
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c index e0f04d5..46e0d4e 100644 --- a/fs/ocfs2/file.c +++ b/fs/ocfs2/file.c @@ -295,7 +295,7 @@ out: return ret; } -static int ocfs2_set_inode_size(handle_t *handle, +int ocfs2_set_inode_size(handle_t *handle, struct inode *inode, struct buffer_head *fe_bh, u64 new_i_size) @@ -441,7 +441,7 @@ out: return status; } -static int ocfs2_truncate_file(struct inode *inode, +int ocfs2_truncate_file(struct inode *inode, struct buffer_head *di_bh, u64 new_i_size) { @@ -709,6 +709,13 @@ leave: return status; } +int ocfs2_extend_allocation(struct inode *inode, u32 logical_start, + u32 clusters_to_add, int mark_unwritten) +{ + return __ocfs2_extend_allocation(inode, logical_start, + clusters_to_add, mark_unwritten); +} + /* * While a write will already be ordering the data, a truncate will not. * Thus, we need to explicitly order the zeroed pages. @@ -2109,6 +2116,9 @@ static int ocfs2_prepare_inode_for_write(struct file *file, struct dentry *dentry = file->f_path.dentry; struct inode *inode = dentry->d_inode; loff_t saved_pos = 0, end; + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + int full_coherency = !(osb->s_mount_opt & + OCFS2_MOUNT_COHERENCY_BUFFERED); /* * We start with a read level meta lock and only jump to an ex @@ -2197,7 +2207,16 @@ static int ocfs2_prepare_inode_for_write(struct file *file, * one node could wind up truncating another * nodes writes. */ - if (end > i_size_read(inode)) { + if (end > i_size_read(inode) && !full_coherency) { + *direct_io = 0; + break; + } + + /* + * Fallback to old way if the feature bit is not set. + */ + if (end > i_size_read(inode) && + !ocfs2_supports_append_dio(osb)) { *direct_io = 0; break; } @@ -2210,7 +2229,13 @@ static int ocfs2_prepare_inode_for_write(struct file *file, */ ret = ocfs2_check_range_for_holes(inode, saved_pos, count); if (ret == 1) { - *direct_io = 0; + /* + * Fallback to old way if the feature bit is not set. + * Otherwise try dio first and then complete the rest + * request through buffer io. + */ + if (!ocfs2_supports_append_dio(osb)) + *direct_io = 0; ret = 0; } else if (ret < 0) mlog_errno(ret); @@ -2243,6 +2268,7 @@ static ssize_t ocfs2_file_write_iter(struct kiocb *iocb, u32 old_clusters; struct file *file = iocb->ki_filp; struct inode *inode = file_inode(file); + struct address_space *mapping = file->f_mapping; struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); int full_coherency = !(osb->s_mount_opt & OCFS2_MOUNT_COHERENCY_BUFFERED); @@ -2357,11 +2383,51 @@ relock: iov_iter_truncate(from, count); if (direct_io) { + loff_t endbyte; + ssize_t written_buffered; written = generic_file_direct_write(iocb, from, *ppos); - if (written < 0) { + if (written < 0 || written == count) { ret = written; goto out_dio; } + + /* + * for completing the rest of the request. + */ + *ppos += written; + count -= written; + written_buffered = generic_perform_write(file, from, *ppos); + /* + * If generic_file_buffered_write() returned a synchronous error + * then we want to return the number of bytes which were + * direct-written, or the error code if that was zero. Note + * that this differs from normal direct-io semantics, which + * will return -EFOO even if some bytes were written. + */ + if (written_buffered < 0) { + ret = written_buffered; + goto out_dio; + } + + iocb->ki_pos = *ppos + written_buffered; + /* We need to ensure that the page cache pages are written to + * disk and invalidated to preserve the expected O_DIRECT + * semantics. + */ + endbyte = *ppos + written_buffered - 1; + ret = filemap_write_and_wait_range(file->f_mapping, *ppos, + endbyte); + if (ret == 0) { + written += written_buffered; + invalidate_mapping_pages(mapping, + *ppos >> PAGE_CACHE_SHIFT, + endbyte >> PAGE_CACHE_SHIFT); + } else { + /* + * We don't know how much we wrote, so just return + * the number of bytes which were direct-written + */ + } } else { current->backing_dev_info = inode_to_bdi(inode); written = generic_perform_write(file, from, *ppos); |