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>

1 files changed, 28 insertions, 9 deletions

diff --git a/fs/xfs/linux-2.6/xfs_aops.c b/fs/xfs/linux-2.6/xfs_aops.c
index 40d2226060d1..6a2910ee8a28 100644
--- 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);