2 files changed, 132 insertions, 48 deletions

diff --git a/fs/xfs/linux-2.6/xfs_aops.c b/fs/xfs/linux-2.6/xfs_aops.c
index 143ffc851c9d..4475588e973a 100644
--- a/fs/xfs/linux-2.6/xfs_aops.c
+++ b/fs/xfs/linux-2.6/xfs_aops.c
@@ -141,9 +141,46 @@ xfs_destroy_ioend(
 }
 
 /*
+ * Update on-disk file size now that data has been written to disk.
+ * The current in-memory file size is i_size.  If a write is beyond
+ * eof io_new_size will be the intended file size until i_size is
+ * updated.  If this write does not extend all the way to the valid
+ * file size then restrict this update to the end of the write.
+ */
+STATIC void
+xfs_setfilesize(
+	xfs_ioend_t		*ioend)
+{
+	xfs_inode_t		*ip;
+	xfs_fsize_t		isize;
+	xfs_fsize_t		bsize;
+
+	ip = xfs_vtoi(ioend->io_vnode);
+
+	ASSERT((ip->i_d.di_mode & S_IFMT) == S_IFREG);
+	ASSERT(ioend->io_type != IOMAP_READ);
+
+	if (unlikely(ioend->io_error))
+		return;
+
+	bsize = ioend->io_offset + ioend->io_size;
+
+	xfs_ilock(ip, XFS_ILOCK_EXCL);
+
+	isize = MAX(ip->i_size, ip->i_iocore.io_new_size);
+	isize = MIN(isize, bsize);
+
+	if (ip->i_d.di_size < isize) {
+		ip->i_d.di_size = isize;
+		ip->i_update_core = 1;
+		ip->i_update_size = 1;
+	}
+
+	xfs_iunlock(ip, XFS_ILOCK_EXCL);
+}
+
+/*
  * Buffered IO write completion for delayed allocate extents.
- * TODO: Update ondisk isize now that we know the file data
- * has been flushed (i.e. the notorious "NULL file" problem).
  */
 STATIC void
 xfs_end_bio_delalloc(
@@ -152,6 +189,7 @@ xfs_end_bio_delalloc(
 	xfs_ioend_t		*ioend =
 		container_of(work, xfs_ioend_t, io_work);
 
+	xfs_setfilesize(ioend);
 	xfs_destroy_ioend(ioend);
 }
 
@@ -165,6 +203,7 @@ xfs_end_bio_written(
 	xfs_ioend_t		*ioend =
 		container_of(work, xfs_ioend_t, io_work);
 
+	xfs_setfilesize(ioend);
 	xfs_destroy_ioend(ioend);
 }
 
@@ -184,8 +223,23 @@ xfs_end_bio_unwritten(
 	xfs_off_t		offset = ioend->io_offset;
 	size_t			size = ioend->io_size;
 
-	if (likely(!ioend->io_error))
+	if (likely(!ioend->io_error)) {
 		bhv_vop_bmap(vp, offset, size, BMAPI_UNWRITTEN, NULL, NULL);
+		xfs_setfilesize(ioend);
+	}
+	xfs_destroy_ioend(ioend);
+}
+
+/*
+ * IO read completion for regular, written extents.
+ */
+STATIC void
+xfs_end_bio_read(
+	struct work_struct	*work)
+{
+	xfs_ioend_t		*ioend =
+		container_of(work, xfs_ioend_t, io_work);
+
 	xfs_destroy_ioend(ioend);
 }
 
@@ -224,6 +278,8 @@ xfs_alloc_ioend(
 		INIT_WORK(&ioend->io_work, xfs_end_bio_unwritten);
 	else if (type == IOMAP_DELAY)
 		INIT_WORK(&ioend->io_work, xfs_end_bio_delalloc);
+	else if (type == IOMAP_READ)
+		INIT_WORK(&ioend->io_work, xfs_end_bio_read);
 	else
 		INIT_WORK(&ioend->io_work, xfs_end_bio_written);
 
@@ -913,7 +969,7 @@ xfs_page_state_convert(
 	bh = head = page_buffers(page);
 	offset = page_offset(page);
 	flags = -1;
-	type = 0;
+	type = IOMAP_READ;
 
 	/* TODO: cleanup count and page_dirty */
 
@@ -999,7 +1055,7 @@ xfs_page_state_convert(
 			 * That means it must already have extents allocated
 			 * underneath it. Map the extent by reading it.
 			 */
-			if (!iomap_valid || type != 0) {
+			if (!iomap_valid || type != IOMAP_READ) {
 				flags = BMAPI_READ;
 				size = xfs_probe_cluster(inode, page, bh,
 								head, 1);
@@ -1010,7 +1066,7 @@ xfs_page_state_convert(
 				iomap_valid = xfs_iomap_valid(&iomap, offset);
 			}
 
-			type = 0;
+			type = IOMAP_READ;
 			if (!test_and_set_bit(BH_Lock, &bh->b_state)) {
 				ASSERT(buffer_mapped(bh));
 				if (iomap_valid)
@@ -1356,12 +1412,21 @@ xfs_end_io_direct(
 	 * completion handler in the future, in which case all this can
 	 * go away.
 	 */
-	if (private && size > 0) {
-		ioend->io_offset = offset;
-		ioend->io_size = size;
+	ioend->io_offset = offset;
+	ioend->io_size = size;
+	if (ioend->io_type == IOMAP_READ) {
+		xfs_finish_ioend(ioend);
+	} else if (private && size > 0) {
 		xfs_finish_ioend(ioend);
 	} else {
-		xfs_destroy_ioend(ioend);
+		/*
+		 * A direct I/O write ioend starts it's life in unwritten
+		 * state in case they map an unwritten extent.  This write
+		 * didn't map an unwritten extent so switch it's completion
+		 * handler.
+		 */
+		INIT_WORK(&ioend->io_work, xfs_end_bio_written);
+		xfs_finish_ioend(ioend);
 	}
 
 	/*
@@ -1392,15 +1457,15 @@ xfs_vm_direct_IO(
 	if (error)
 		return -error;
 
-	iocb->private = xfs_alloc_ioend(inode, IOMAP_UNWRITTEN);
-
 	if (rw == WRITE) {
+		iocb->private = xfs_alloc_ioend(inode, IOMAP_UNWRITTEN);
 		ret = blockdev_direct_IO_own_locking(rw, iocb, inode,
 			iomap.iomap_target->bt_bdev,
 			iov, offset, nr_segs,
 			xfs_get_blocks_direct,
 			xfs_end_io_direct);
 	} else {
+		iocb->private = xfs_alloc_ioend(inode, IOMAP_READ);
 		ret = blockdev_direct_IO_no_locking(rw, iocb, inode,
 			iomap.iomap_target->bt_bdev,
 			iov, offset, nr_segs,
diff --git a/fs/xfs/linux-2.6/xfs_lrw.c b/fs/xfs/linux-2.6/xfs_lrw.c
index 80fe31233471..82ab792c7fc9 100644
--- a/fs/xfs/linux-2.6/xfs_lrw.c
+++ b/fs/xfs/linux-2.6/xfs_lrw.c
@@ -224,7 +224,7 @@ xfs_read(
 				mp->m_rtdev_targp : mp->m_ddev_targp;
 		if ((*offset & target->bt_smask) ||
 		    (size & target->bt_smask)) {
-			if (*offset == ip->i_d.di_size) {
+			if (*offset == ip->i_size) {
 				return (0);
 			}
 			return -XFS_ERROR(EINVAL);
@@ -387,9 +387,10 @@ xfs_splice_write(
 {
 	xfs_inode_t		*ip = XFS_BHVTOI(bdp);
 	xfs_mount_t		*mp = ip->i_mount;
+	xfs_iocore_t		*io = &ip->i_iocore;
 	ssize_t			ret;
 	struct inode		*inode = outfilp->f_mapping->host;
-	xfs_fsize_t		isize;
+	xfs_fsize_t		isize, new_size;
 
 	XFS_STATS_INC(xs_write_calls);
 	if (XFS_FORCED_SHUTDOWN(ip->i_mount))
@@ -410,6 +411,14 @@ xfs_splice_write(
 			return -error;
 		}
 	}
+
+	new_size = *ppos + count;
+
+	xfs_ilock(ip, XFS_ILOCK_EXCL);
+	if (new_size > ip->i_size)
+		io->io_new_size = new_size;
+	xfs_iunlock(ip, XFS_ILOCK_EXCL);
+
 	xfs_rw_enter_trace(XFS_SPLICE_WRITE_ENTER, &ip->i_iocore,
 			   pipe, count, *ppos, ioflags);
 	ret = generic_file_splice_write(pipe, outfilp, ppos, count, flags);
@@ -420,14 +429,18 @@ xfs_splice_write(
 	if (unlikely(ret < 0 && ret != -EFAULT && *ppos > isize))
 		*ppos = isize;
 
-	if (*ppos > ip->i_d.di_size) {
+	if (*ppos > ip->i_size) {
 		xfs_ilock(ip, XFS_ILOCK_EXCL);
-		if (*ppos > ip->i_d.di_size) {
-			ip->i_d.di_size = *ppos;
-			i_size_write(inode, *ppos);
-			ip->i_update_core = 1;
-			ip->i_update_size = 1;
-		}
+		if (*ppos > ip->i_size)
+			ip->i_size = *ppos;
+		xfs_iunlock(ip, XFS_ILOCK_EXCL);
+	}
+
+	if (io->io_new_size) {
+		xfs_ilock(ip, XFS_ILOCK_EXCL);
+		io->io_new_size = 0;
+		if (ip->i_d.di_size > ip->i_size)
+			ip->i_d.di_size = ip->i_size;
 		xfs_iunlock(ip, XFS_ILOCK_EXCL);
 	}
 	xfs_iunlock(ip, XFS_IOLOCK_EXCL);
@@ -711,8 +724,6 @@ start:
 		goto out_unlock_mutex;
 	}
 
-	isize = i_size_read(inode);
-
 	if (ioflags & IO_ISDIRECT) {
 		xfs_buftarg_t	*target =
 			(xip->i_d.di_flags & XFS_DIFLAG_REALTIME) ?
@@ -723,7 +734,7 @@ start:
 			return XFS_ERROR(-EINVAL);
 		}
 
-		if (!need_i_mutex && (VN_CACHED(vp) || pos > isize)) {
+		if (!need_i_mutex && (VN_CACHED(vp) || pos > xip->i_size)) {
 			xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock);
 			iolock = XFS_IOLOCK_EXCL;
 			locktype = VRWLOCK_WRITE;
@@ -735,7 +746,7 @@ start:
 	}
 
 	new_size = pos + count;
-	if (new_size > isize)
+	if (new_size > xip->i_size)
 		io->io_new_size = new_size;
 
 	if ((DM_EVENT_ENABLED(vp->v_vfsp, xip, DM_EVENT_WRITE) &&
@@ -751,8 +762,7 @@ start:
 				      pos, count,
 				      dmflags, &locktype);
 		if (error) {
-			xfs_iunlock(xip, iolock);
-			goto out_unlock_mutex;
+			goto out_unlock_internal;
 		}
 		xfs_ilock(xip, XFS_ILOCK_EXCL);
 		eventsent = 1;
@@ -764,9 +774,8 @@ start:
 		 * event prevents another call to XFS_SEND_DATA, which is
 		 * what allows the size to change in the first place.
 		 */
-		if ((file->f_flags & O_APPEND) && savedsize != isize) {
+		if ((file->f_flags & O_APPEND) && savedsize != xip->i_size)
 			goto start;
-		}
 	}
 
 	if (likely(!(ioflags & IO_INVIS))) {
@@ -784,11 +793,11 @@ start:
 	 * to zero it out up to the new size.
 	 */
 
-	if (pos > isize) {
-		error = xfs_zero_eof(BHV_TO_VNODE(bdp), io, pos, isize);
+	if (pos > xip->i_size) {
+		error = xfs_zero_eof(BHV_TO_VNODE(bdp), io, pos, xip->i_size);
 		if (error) {
-			xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock);
-			goto out_unlock_mutex;
+			xfs_iunlock(xip, XFS_ILOCK_EXCL);
+			goto out_unlock_internal;
 		}
 	}
 	xfs_iunlock(xip, XFS_ILOCK_EXCL);
@@ -808,8 +817,7 @@ start:
 		if (likely(!error))
 			error = -remove_suid(file->f_path.dentry);
 		if (unlikely(error)) {
-			xfs_iunlock(xip, iolock);
-			goto out_unlock_mutex;
+			goto out_unlock_internal;
 		}
 	}
 
@@ -879,12 +887,12 @@ retry:
 		error = XFS_SEND_NAMESP(xip->i_mount, DM_EVENT_NOSPACE, vp,
 				DM_RIGHT_NULL, vp, DM_RIGHT_NULL, NULL, NULL,
 				0, 0, 0); /* Delay flag intentionally  unused */
-		if (error)
-			goto out_nounlocks;
 		if (need_i_mutex)
 			mutex_lock(&inode->i_mutex);
 		xfs_rwlock(bdp, locktype);
-		pos = xip->i_d.di_size;
+		if (error)
+			goto out_unlock_internal;
+		pos = xip->i_size;
 		ret = 0;
 		goto retry;
 	}
@@ -893,14 +901,10 @@ retry:
 	if (unlikely(ret < 0 && ret != -EFAULT && *offset > isize))
 		*offset = isize;
 
-	if (*offset > xip->i_d.di_size) {
+	if (*offset > xip->i_size) {
 		xfs_ilock(xip, XFS_ILOCK_EXCL);
-		if (*offset > xip->i_d.di_size) {
-			xip->i_d.di_size = *offset;
-			i_size_write(inode, *offset);
-			xip->i_update_core = 1;
-			xip->i_update_size = 1;
-		}
+		if (*offset > xip->i_size)
+			xip->i_size = *offset;
 		xfs_iunlock(xip, XFS_ILOCK_EXCL);
 	}
 
@@ -922,16 +926,31 @@ retry:
 
 		error = sync_page_range(inode, mapping, pos, ret);
 		if (!error)
-			error = ret;
-		return error;
+			error = -ret;
+		if (need_i_mutex)
+			mutex_lock(&inode->i_mutex);
+		xfs_rwlock(bdp, locktype);
 	}
 
  out_unlock_internal:
+	if (io->io_new_size) {
+		xfs_ilock(xip, XFS_ILOCK_EXCL);
+		io->io_new_size = 0;
+		/*
+		 * If this was a direct or synchronous I/O that failed (such
+		 * as ENOSPC) then part of the I/O may have been written to
+		 * disk before the error occured.  In this case the on-disk
+		 * file size may have been adjusted beyond the in-memory file
+		 * size and now needs to be truncated back.
+		 */
+		if (xip->i_d.di_size > xip->i_size)
+			xip->i_d.di_size = xip->i_size;
+		xfs_iunlock(xip, XFS_ILOCK_EXCL);
+	}
 	xfs_rwunlock(bdp, locktype);
  out_unlock_mutex:
 	if (need_i_mutex)
 		mutex_unlock(&inode->i_mutex);
- out_nounlocks:
 	return -error;
 }