From: David Chinner <dgc@sgi.com>
Date: Thu, 7 Sep 2006 04:27:15 +0000 (+1000)
Subject: [XFS] Fix xfs_splice_write() so appended data gets to disk.
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=0a8d17d090a4939643a52194b7d4a4001b9b2d93;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

[XFS] Fix xfs_splice_write() so appended data gets to disk.

xfs_splice_write() failed to update the on disk inode size when extending
the so when the file was closed the range extended by splice was truncated
off. Hence any region of a file written to by splice would end up as a
hole full of zeros.

SGI-PV: 955939
SGI-Modid: xfs-linux-melb:xfs-kern:26920a

Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: David Chatterton <chatz@sgi.com>
---

diff --git a/fs/xfs/linux-2.6/xfs_lrw.c b/fs/xfs/linux-2.6/xfs_lrw.c
index 110c038910ff..ee788b1cb364 100644
--- a/fs/xfs/linux-2.6/xfs_lrw.c
+++ b/fs/xfs/linux-2.6/xfs_lrw.c
@@ -391,6 +391,8 @@ xfs_splice_write(
 	xfs_inode_t		*ip = XFS_BHVTOI(bdp);
 	xfs_mount_t		*mp = ip->i_mount;
 	ssize_t			ret;
+	struct inode		*inode = outfilp->f_mapping->host;
+	xfs_fsize_t		isize;
 
 	XFS_STATS_INC(xs_write_calls);
 	if (XFS_FORCED_SHUTDOWN(ip->i_mount))
@@ -417,6 +419,20 @@ xfs_splice_write(
 	if (ret > 0)
 		XFS_STATS_ADD(xs_write_bytes, ret);
 
+	isize = i_size_read(inode);
+	if (unlikely(ret < 0 && ret != -EFAULT && *ppos > isize))
+		*ppos = isize;
+
+	if (*ppos > ip->i_d.di_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;
+		}
+		xfs_iunlock(ip, XFS_ILOCK_EXCL);
+	}
 	xfs_iunlock(ip, XFS_IOLOCK_EXCL);
 	return ret;
 }