[XFS] propogate return codes from flush routines

This patch handles error return values in fs_flush_pages and
fs_flushinval_pages. It changes the prototype of fs_flushinval_pages so we
can propogate the errors and handle them at higher layers. I also modified
xfs_itruncate_start so that it could propogate the error further.

SGI-PV: 961990
SGI-Modid: xfs-linux-melb:xfs-kern:28231a

Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Signed-off-by: Stewart Smith <stewart@flamingspork.com>
Signed-off-by: Tim Shimmin <tes@sgi.com>

fs/xfs/linux-2.6/xfs_fs_subr.c

@@ -35,7 +35,7 @@ fs_tosspages(
 		truncate_inode_pages(ip->i_mapping, first);
 }
 
-void
+int
 fs_flushinval_pages(
 	bhv_desc_t	*bdp,
 	xfs_off_t	first,
@@ -44,13 +44,16 @@ fs_flushinval_pages(
 {
 	bhv_vnode_t	*vp = BHV_TO_VNODE(bdp);
 	struct inode	*ip = vn_to_inode(vp);
+	int		ret = 0;
 
 	if (VN_CACHED(vp)) {
 		if (VN_TRUNC(vp))
 			VUNTRUNCATE(vp);
-		filemap_write_and_wait(ip->i_mapping);
+		ret = filemap_write_and_wait(ip->i_mapping);
-		truncate_inode_pages(ip->i_mapping, first);
+		if (!ret)
+			truncate_inode_pages(ip->i_mapping, first);
 	}
+	return ret;
 }
 
 int
@@ -63,14 +66,18 @@ fs_flush_pages(
 {
 	bhv_vnode_t	*vp = BHV_TO_VNODE(bdp);
 	struct inode	*ip = vn_to_inode(vp);
+	int		ret = 0;
+	int		ret2;
 
 	if (VN_DIRTY(vp)) {
 		if (VN_TRUNC(vp))
 			VUNTRUNCATE(vp);
-		filemap_fdatawrite(ip->i_mapping);
+		ret = filemap_fdatawrite(ip->i_mapping);
 		if (flags & XFS_B_ASYNC)
-			return 0;
+			return ret;
-		filemap_fdatawait(ip->i_mapping);
+		ret2 = filemap_fdatawait(ip->i_mapping);
+		if (!ret)
+			ret = ret2;
 	}
-	return 0;
+	return ret;
 }

fs/xfs/linux-2.6/xfs_fs_subr.h

@@ -23,7 +23,7 @@ extern int  fs_noerr(void);
 extern int  fs_nosys(void);
 extern void fs_noval(void);
 extern void fs_tosspages(bhv_desc_t *, xfs_off_t, xfs_off_t, int);
-extern void fs_flushinval_pages(bhv_desc_t *, xfs_off_t, xfs_off_t, int);
+extern int  fs_flushinval_pages(bhv_desc_t *, xfs_off_t, xfs_off_t, int);
 extern int  fs_flush_pages(bhv_desc_t *, xfs_off_t, xfs_off_t, uint64_t, int);
 
 #endif	/* __XFS_FS_SUBR_H__ */

fs/xfs/linux-2.6/xfs_lrw.c

@@ -191,7 +191,7 @@ xfs_read(
 	struct file		*file = iocb->ki_filp;
 	struct inode		*inode = file->f_mapping->host;
 	size_t			size = 0;
-	ssize_t			ret;
+	ssize_t			ret = 0;
 	xfs_fsize_t		n;
 	xfs_inode_t		*ip;
 	xfs_mount_t		*mp;
@@ -263,9 +263,13 @@ xfs_read(
 
 	if (unlikely(ioflags & IO_ISDIRECT)) {
 		if (VN_CACHED(vp))
-			bhv_vop_flushinval_pages(vp, ctooff(offtoct(*offset)),
+			ret = bhv_vop_flushinval_pages(vp, ctooff(offtoct(*offset)),
 						 -1, FI_REMAPF_LOCKED);
 		mutex_unlock(&inode->i_mutex);
+		if (ret) {
+			xfs_iunlock(ip, XFS_IOLOCK_SHARED);
+			return ret;
+		}
 	}
 
 	xfs_rw_enter_trace(XFS_READ_ENTER, &ip->i_iocore,
@@ -814,8 +818,10 @@ retry:
 		if (need_flush) {
 			xfs_inval_cached_trace(io, pos, -1,
 					ctooff(offtoct(pos)), -1);
-			bhv_vop_flushinval_pages(vp, ctooff(offtoct(pos)),
+			error = bhv_vop_flushinval_pages(vp, ctooff(offtoct(pos)),
 					-1, FI_REMAPF_LOCKED);
+			if (error)
+				goto out_unlock_internal;
 		}
 
 		if (need_i_mutex) {

fs/xfs/linux-2.6/xfs_vnode.h

@@ -194,7 +194,7 @@ typedef	int	(*vop_attr_list_t)(bhv_desc_t *, char *, int, int,
 typedef void	(*vop_link_removed_t)(bhv_desc_t *, bhv_vnode_t *, int);
 typedef void	(*vop_vnode_change_t)(bhv_desc_t *, bhv_vchange_t, __psint_t);
 typedef void	(*vop_ptossvp_t)(bhv_desc_t *, xfs_off_t, xfs_off_t, int);
-typedef void	(*vop_pflushinvalvp_t)(bhv_desc_t *, xfs_off_t, xfs_off_t, int);
+typedef int	(*vop_pflushinvalvp_t)(bhv_desc_t *, xfs_off_t, xfs_off_t, int);
 typedef int	(*vop_pflushvp_t)(bhv_desc_t *, xfs_off_t, xfs_off_t,
 				uint64_t, int);
 typedef int	(*vop_iflush_t)(bhv_desc_t *, int);

fs/xfs/xfs_dfrag.c

@@ -199,7 +199,9 @@ xfs_swap_extents(
 
 	if (VN_CACHED(tvp) != 0) {
 		xfs_inval_cached_trace(&tip->i_iocore, 0, -1, 0, -1);
-		bhv_vop_flushinval_pages(tvp, 0, -1, FI_REMAPF_LOCKED);
+		error = bhv_vop_flushinval_pages(tvp, 0, -1, FI_REMAPF_LOCKED);
+		if (error)
+			goto error0;
 	}
 
 	/* Verify O_DIRECT for ftmp */

fs/xfs/xfs_inode.c

@@ -1421,7 +1421,7 @@ xfs_itrunc_trace(
  * must be called again with all the same restrictions as the initial
  * call.
  */
-void
+int
 xfs_itruncate_start(
 	xfs_inode_t	*ip,
 	uint		flags,
@@ -1431,6 +1431,7 @@ xfs_itruncate_start(
 	xfs_off_t	toss_start;
 	xfs_mount_t	*mp;
 	bhv_vnode_t	*vp;
+	int		error = 0;
 
 	ASSERT(ismrlocked(&ip->i_iolock, MR_UPDATE) != 0);
 	ASSERT((new_size == 0) || (new_size <= ip->i_d.di_size));
@@ -1468,7 +1469,7 @@ xfs_itruncate_start(
 		 * file size, so there is no way that the data extended
 		 * out there.
 		 */
-		return;
+		return 0;
 	}
 	last_byte = xfs_file_last_byte(ip);
 	xfs_itrunc_trace(XFS_ITRUNC_START, ip, flags, new_size, toss_start,
@@ -1477,7 +1478,7 @@ xfs_itruncate_start(
 		if (flags & XFS_ITRUNC_DEFINITE) {
 			bhv_vop_toss_pages(vp, toss_start, -1, FI_REMAPF_LOCKED);
 		} else {
-			bhv_vop_flushinval_pages(vp, toss_start, -1, FI_REMAPF_LOCKED);
+			error = bhv_vop_flushinval_pages(vp, toss_start, -1, FI_REMAPF_LOCKED);
 		}
 	}
 
@@ -1486,6 +1487,7 @@ xfs_itruncate_start(
 		ASSERT(VN_CACHED(vp) == 0);
 	}
 #endif
+	return error;
 }
 
 /*

fs/xfs/xfs_inode.h

@@ -481,7 +481,7 @@ uint		xfs_ip2xflags(struct xfs_inode *);
 uint		xfs_dic2xflags(struct xfs_dinode_core *);
 int		xfs_ifree(struct xfs_trans *, xfs_inode_t *,
 			   struct xfs_bmap_free *);
-void		xfs_itruncate_start(xfs_inode_t *, uint, xfs_fsize_t);
+int		xfs_itruncate_start(xfs_inode_t *, uint, xfs_fsize_t);
 int		xfs_itruncate_finish(struct xfs_trans **, xfs_inode_t *,
 				     xfs_fsize_t, int, int);
 int		xfs_iunlink(struct xfs_trans *, xfs_inode_t *);

fs/xfs/xfs_utils.c

@@ -420,7 +420,11 @@ xfs_truncate_file(
 	 * in a transaction.
 	 */
 	xfs_ilock(ip, XFS_IOLOCK_EXCL);
-	xfs_itruncate_start(ip, XFS_ITRUNC_DEFINITE, (xfs_fsize_t)0);
+	error = xfs_itruncate_start(ip, XFS_ITRUNC_DEFINITE, (xfs_fsize_t)0);
+	if (error) {
+		xfs_iunlock(ip, XFS_IOLOCK_EXCL);
+		return error;
+	}
 
 	tp = xfs_trans_alloc(mp, XFS_TRANS_TRUNCATE_FILE);
 	if ((error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0,

fs/xfs/xfs_vfsops.c

@@ -1147,7 +1147,7 @@ xfs_sync_inodes(
 			if (XFS_FORCED_SHUTDOWN(mp)) {
 				bhv_vop_toss_pages(vp, 0, -1, FI_REMAPF);
 			} else {
-				bhv_vop_flushinval_pages(vp, 0, -1, FI_REMAPF);
+				error = bhv_vop_flushinval_pages(vp, 0, -1, FI_REMAPF);
 			}
 
 			xfs_ilock(ip, XFS_ILOCK_SHARED);

fs/xfs/xfs_vnodeops.c

@@ -1257,8 +1257,12 @@ xfs_inactive_free_eofblocks(
 		 * do that within a transaction.
 		 */
 		xfs_ilock(ip, XFS_IOLOCK_EXCL);
-		xfs_itruncate_start(ip, XFS_ITRUNC_DEFINITE,
+		error = xfs_itruncate_start(ip, XFS_ITRUNC_DEFINITE,
 				    ip->i_d.di_size);
+		if (error) {
+			xfs_iunlock(ip, XFS_IOLOCK_EXCL);
+			return error;
+		}
 
 		error = xfs_trans_reserve(tp, 0,
 					  XFS_ITRUNCATE_LOG_RES(mp),
@@ -1674,7 +1678,11 @@ xfs_inactive(
 		 */
 		xfs_ilock(ip, XFS_IOLOCK_EXCL);
 
-		xfs_itruncate_start(ip, XFS_ITRUNC_DEFINITE, 0);
+		error = xfs_itruncate_start(ip, XFS_ITRUNC_DEFINITE, 0);
+		if (error) {
+			xfs_iunlock(ip, XFS_IOLOCK_EXCL);
+			return VN_INACTIVE_CACHE;
+		}
 
 		error = xfs_trans_reserve(tp, 0,
 					  XFS_ITRUNCATE_LOG_RES(mp),
@@ -4338,8 +4346,10 @@ xfs_free_file_space(
 	if (VN_CACHED(vp) != 0) {
 		xfs_inval_cached_trace(&ip->i_iocore, ioffset, -1,
 				ctooff(offtoct(ioffset)), -1);
-		bhv_vop_flushinval_pages(vp, ctooff(offtoct(ioffset)),
+		error = bhv_vop_flushinval_pages(vp, ctooff(offtoct(ioffset)),
 				-1, FI_REMAPF_LOCKED);
+		if (error)
+			goto out_unlock_iolock;
 	}
 
 	/*