From: Dave Chinner <david@from...>

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@from...>
Signed-off-by: Christoph Hellwig <hch@lst....>

Index: linux-2.6/fs/xfs/linux-2.6/xfs_aops.c
===================================================================
--- linux-2.6.orig/fs/xfs/linux-2.6/xfs_aops.c 2009-08-26 20:06:07.105357325 -0300
+++ linux-2.6/fs/xfs/linux-2.6/xfs_aops.c 2009-08-26 20:08:09.017355358 -0300
@@ -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);

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