xfs: remove the i_size field in struct xfs_inode

There is no fundamental need to keep an in-memory inode size copy in the XFS
inode.  We already have the on-disk value in the dinode, and the separate
in-memory copy that we need for regular files only in the XFS inode.

Remove the xfs_inode i_size field and change the XFS_ISIZE macro to use the
VFS inode i_size field for regular files.  Switch code that was directly
accessing the i_size field in the xfs_inode to XFS_ISIZE, or in cases where
we are limited to regular files direct access of the VFS inode i_size field.

This also allows dropping some fairly complicated code in the write path
which dealt with keeping the xfs_inode i_size uptodate with the VFS i_size
that is getting updated inside ->write_end.

Note that we do not bother resetting the VFS i_size when truncating a file
that gets freed to zero as there is no point in doing so because the VFS inode
is no longer in use at this point.  Just relax the assert in xfs_ifree to
only check the on-disk size instead.

Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ben Myers <bpm@sgi.com>

1 files changed, 11 insertions, 34 deletions

diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index f675f3d9d7b3..86d5dc260464 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -327,7 +327,7 @@ xfs_file_aio_read(
 				mp->m_rtdev_targp : mp->m_ddev_targp;
 		if ((iocb->ki_pos & target->bt_smask) ||
 		    (size & target->bt_smask)) {
-			if (iocb->ki_pos == ip->i_size)
+			if (iocb->ki_pos == i_size_read(inode))
 				return 0;
 			return -XFS_ERROR(EINVAL);
 		}
@@ -412,30 +412,6 @@ xfs_file_splice_read(
 	return ret;
 }
 
-STATIC void
-xfs_aio_write_isize_update(
-	struct inode	*inode,
-	loff_t		*ppos,
-	ssize_t		bytes_written)
-{
-	struct xfs_inode	*ip = XFS_I(inode);
-	xfs_fsize_t		isize = i_size_read(inode);
-
-	if (bytes_written > 0)
-		XFS_STATS_ADD(xs_write_bytes, bytes_written);
-
-	if (unlikely(bytes_written < 0 && bytes_written != -EFAULT &&
-					*ppos > isize))
-		*ppos = isize;
-
-	if (*ppos > ip->i_size) {
-		xfs_rw_ilock(ip, XFS_ILOCK_EXCL);
-		if (*ppos > ip->i_size)
-			ip->i_size = *ppos;
-		xfs_rw_iunlock(ip, XFS_ILOCK_EXCL);
-	}
-}
-
 /*
  * 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 occurred.  In
@@ -451,8 +427,8 @@ xfs_aio_write_newsize_update(
 		xfs_rw_ilock(ip, XFS_ILOCK_EXCL);
 		if (new_size == ip->i_new_size)
 			ip->i_new_size = 0;
-		if (ip->i_d.di_size > ip->i_size)
-			ip->i_d.di_size = ip->i_size;
+		if (ip->i_d.di_size > i_size_read(VFS_I(ip)))
+			ip->i_d.di_size = i_size_read(VFS_I(ip));
 		xfs_rw_iunlock(ip, XFS_ILOCK_EXCL);
 	}
 }
@@ -492,15 +468,16 @@ xfs_file_splice_write(
 	new_size = *ppos + count;
 
 	xfs_ilock(ip, XFS_ILOCK_EXCL);
-	if (new_size > ip->i_size)
+	if (new_size > i_size_read(inode))
 		ip->i_new_size = new_size;
 	xfs_iunlock(ip, XFS_ILOCK_EXCL);
 
 	trace_xfs_file_splice_write(ip, count, *ppos, ioflags);
 
 	ret = generic_file_splice_write(pipe, outfilp, ppos, count, flags);
+	if (ret > 0)
+		XFS_STATS_ADD(xs_write_bytes, ret);
 
-	xfs_aio_write_isize_update(inode, ppos, ret);
 	xfs_aio_write_newsize_update(ip, new_size);
 	xfs_iunlock(ip, XFS_IOLOCK_EXCL);
 	return ret;
@@ -728,14 +705,14 @@ restart:
 	 * values are still valid.
 	 */
 	if ((ip->i_new_size && *pos > ip->i_new_size) ||
-	    (!ip->i_new_size && *pos > ip->i_size)) {
+	    (!ip->i_new_size && *pos > i_size_read(inode))) {
 		if (*iolock == XFS_IOLOCK_SHARED) {
 			xfs_rw_iunlock(ip, XFS_ILOCK_EXCL | *iolock);
 			*iolock = XFS_IOLOCK_EXCL;
 			xfs_rw_ilock(ip, XFS_ILOCK_EXCL | *iolock);
 			goto restart;
 		}
-		error = -xfs_zero_eof(ip, *pos, ip->i_size);
+		error = -xfs_zero_eof(ip, *pos, i_size_read(inode));
 	}
 
 	/*
@@ -744,7 +721,7 @@ restart:
 	 * ip->i_new_size if this IO ends beyond any other in-flight writes.
 	 */
 	new_size = *pos + *count;
-	if (new_size > ip->i_size) {
+	if (new_size > i_size_read(inode)) {
 		if (new_size > ip->i_new_size)
 			ip->i_new_size = new_size;
 		*new_sizep = new_size;
@@ -957,11 +934,11 @@ xfs_file_aio_write(
 		ret = xfs_file_buffered_aio_write(iocb, iovp, nr_segs, pos,
 						ocount, &new_size, &iolock);
 
-	xfs_aio_write_isize_update(inode, &iocb->ki_pos, ret);
-
 	if (ret <= 0)
 		goto out_unlock;
 
+	XFS_STATS_ADD(xs_write_bytes, ret);
+
 	/* Handle various SYNC-type writes */
 	if ((file->f_flags & O_DSYNC) || IS_SYNC(inode)) {
 		loff_t end = pos + ret - 1;