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authorDavid Chinner <dgc@sgi.com>2006-03-22 12:47:15 +1100
committerNathan Scott <nathans@sgi.com>2006-03-22 12:47:15 +1100
commit38e2299a641d93d029eb559e096648ab75a22be2 (patch)
tree3aa1afbd899c668ff6f50daa302533a219f8c8c3 /fs/xfs
parent9fa8046f50bcb88ab9183ee1f22de5adc42bf92a (diff)
[XFS] Explain the race closed by the addition of vn_iowait() to the start
of xfs_itruncate_start(). SGI-PV: 947420 SGI-Modid: xfs-linux-melb:xfs-kern:25527a Signed-off-by: David Chinner <dgc@sgi.com> Signed-off-by: Nathan Scott <nathans@sgi.com>
Diffstat (limited to 'fs/xfs')
-rw-r--r--fs/xfs/xfs_inode.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 8d2b36879f0..88a517fad07 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -1393,6 +1393,16 @@ xfs_itrunc_trace(
* calling into the buffer/page cache code and we can't hold the
* inode lock when we do so.
*
+ * We need to wait for any direct I/Os in flight to complete before we
+ * proceed with the truncate. This is needed to prevent the extents
+ * being read or written by the direct I/Os from being removed while the
+ * I/O is in flight as there is no other method of synchronising
+ * direct I/O with the truncate operation. Also, because we hold
+ * the IOLOCK in exclusive mode, we prevent new direct I/Os from being
+ * started until the truncate completes and drops the lock. Essentially,
+ * the vn_iowait() call forms an I/O barrier that provides strict ordering
+ * between direct I/Os and the truncate operation.
+ *
* The flags parameter can have either the value XFS_ITRUNC_DEFINITE
* or XFS_ITRUNC_MAYBE. The XFS_ITRUNC_MAYBE value should be used
* in the case that the caller is locking things out of order and