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authorDavid Chinner <dgc@sgi.com>2007-07-19 16:28:58 +1000
committerTim Shimmin <tes@chook.melbourne.sgi.com>2007-07-19 19:52:05 +1000
commitc32676eea19ce29cb74dba0f97b085e83f6b8915 (patch)
tree5eddf206e10b0b1857c899fd9939c517aa758359
parent91ebecc74eeeeea0a2aa50bf1964ec2214a229c9 (diff)
downloadlinux-linaro-c32676eea19ce29cb74dba0f97b085e83f6b8915.tar.gz
[XFS] Fix inode size update before data write in xfs_setattr
When changing the file size by a truncate() call, we log the change in the inode size. However, we do not flush any outstanding data that might not have been written to disk, thereby violating the data/inode size update order. This can leave files full of NULLs on crash. Hence if we are truncating the file, flush any unwritten data that may lie between the curret on disk inode size and the new inode size that is being logged to ensure that ordering is preserved. SGI-PV: 966308 SGI-Modid: xfs-linux-melb:xfs-kern:29174a Signed-off-by: David Chinner <dgc@sgi.com> Signed-off-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Tim Shimmin <tes@sgi.com>
-rw-r--r--fs/xfs/xfs_vnodeops.c25
1 files changed, 24 insertions, 1 deletions
diff --git a/fs/xfs/xfs_vnodeops.c b/fs/xfs/xfs_vnodeops.c
index 401cb00a55d..1a5ad8cd97b 100644
--- a/fs/xfs/xfs_vnodeops.c
+++ b/fs/xfs/xfs_vnodeops.c
@@ -589,7 +589,30 @@ xfs_setattr(
code = xfs_igrow_start(ip, vap->va_size, credp);
}
xfs_iunlock(ip, XFS_ILOCK_EXCL);
- vn_iowait(vp); /* wait for the completion of any pending DIOs */
+
+ /*
+ * We are going to log the inode size change in this
+ * transaction so any previous writes that are beyond the on
+ * disk EOF and the new EOF that have not been written out need
+ * to be written here. If we do not write the data out, we
+ * expose ourselves to the null files problem.
+ *
+ * Only flush from the on disk size to the smaller of the in
+ * memory file size or the new size as that's the range we
+ * really care about here and prevents waiting for other data
+ * not within the range we care about here.
+ */
+ if (!code &&
+ (ip->i_size != ip->i_d.di_size) &&
+ (vap->va_size > ip->i_d.di_size)) {
+ code = bhv_vop_flush_pages(XFS_ITOV(ip),
+ ip->i_d.di_size, vap->va_size,
+ XFS_B_ASYNC, FI_NONE);
+ }
+
+ /* wait for all I/O to complete */
+ vn_iowait(vp);
+
if (!code)
code = xfs_itruncate_data(ip, vap->va_size);
if (code) {