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authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2008-10-16 18:09:17 +0400
committerTheodore Ts'o <tytso@mit.edu>2008-10-16 18:09:17 +0400
commit17bc6c30cf6bfffd816bdc53682dd46fc34a2cf4 (patch)
tree9fb9512764e970123c0f44573b0bfd74539744e3 /include/linux/writeback.h
parent74baaaaec8b4f22e1ae279f5ecca4ff705b28912 (diff)
downloadlinux-17bc6c30cf6bfffd816bdc53682dd46fc34a2cf4.tar.xz
vfs: Add no_nrwrite_index_update writeback control flag
If no_nrwrite_index_update is set we don't update nr_to_write and address space writeback_index in write_cache_pages. This change enables a file system to skip these updates in write_cache_pages and do them in the writepages() callback. This patch will be followed by an ext4 patch that make use of these new flags. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> CC: linux-fsdevel@vger.kernel.org
Diffstat (limited to 'include/linux/writeback.h')
-rw-r--r--include/linux/writeback.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index bd91987c065f..e585657e9831 100644
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -63,6 +63,15 @@ struct writeback_control {
unsigned for_writepages:1; /* This is a writepages() call */
unsigned range_cyclic:1; /* range_start is cyclic */
unsigned more_io:1; /* more io to be dispatched */
+ /*
+ * write_cache_pages() won't update wbc->nr_to_write and
+ * mapping->writeback_index if no_nrwrite_index_update
+ * is set. write_cache_pages() may write more than we
+ * requested and we want to make sure nr_to_write and
+ * writeback_index are updated in a consistent manner
+ * so we use a single control to update them
+ */
+ unsigned no_nrwrite_index_update:1;
};
/*