xfs: mark inodes dirty before issuing I/O

To make sure they get properly waited on in sync when I/O is in flight and
we latter need to update the inode size.  Requires a new helper to check if an
ioend structure is beyond the current EOF.

Signed-off-by: Dave Chinner <david@fromorbit.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Alex Elder <aelder@sgi.com>
Signed-off-by: Alex Elder <aelder@sgi.com>

diff --git a/fs/xfs/linux-2.6/xfs_aops.c b/fs/xfs/linux-2.6/xfs_aops.c
index 40d2226..6a2910e 100644 (file)
--- a/fs/xfs/linux-2.6/xfs_aops.c
+++ b/fs/xfs/linux-2.6/xfs_aops.c
@@ -186,19 +186,37 @@ xfs_destroy_ioend(
 }
 
 /*
+ * If the end of the current ioend is beyond the current EOF,
+ * return the new EOF value, otherwise zero.
+ */
+STATIC xfs_fsize_t
+xfs_ioend_new_eof(
+       xfs_ioend_t             *ioend)
+{
+       xfs_inode_t             *ip = XFS_I(ioend->io_inode);
+       xfs_fsize_t             isize;
+       xfs_fsize_t             bsize;
+
+       bsize = ioend->io_offset + ioend->io_size;
+       isize = MAX(ip->i_size, ip->i_new_size);
+       isize = MIN(isize, bsize);
+       return isize > ip->i_d.di_size ? isize : 0;
+}
+
+/*
  * 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 i_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_I(ioend->io_inode);
        xfs_fsize_t             isize;
-       xfs_fsize_t             bsize;
 
        ASSERT((ip->i_d.di_mode & S_IFMT) == S_IFREG);
        ASSERT(ioend->io_type != IOMAP_READ);
@@ -206,14 +224,9 @@ xfs_setfilesize(
        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_new_size);
-       isize = MIN(isize, bsize);
-
-       if (ip->i_d.di_size < isize) {
+       isize = xfs_ioend_new_eof(ioend);
+       if (isize) {
                ip->i_d.di_size = isize;
                xfs_mark_inode_dirty_sync(ip);
        }
@@ -403,10 +416,16 @@ xfs_submit_ioend_bio(
        struct bio      *bio)
 {
        atomic_inc(&ioend->io_remaining);
-
        bio->bi_private = ioend;
        bio->bi_end_io = xfs_end_bio;
 
+       /*
+        * If the I/O is beyond EOF we mark the inode dirty immediately
+        * but don't update the inode size until I/O completion.
+        */
+       if (xfs_ioend_new_eof(ioend))
+               xfs_mark_inode_dirty_sync(XFS_I(ioend->io_inode));
+
        submit_bio(WRITE, bio);
        ASSERT(!bio_flagged(bio, BIO_EOPNOTSUPP));
        bio_put(bio);