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vfs: Add no_nrwrite_index_update writeback control flag

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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
This commit is contained in:
Aneesh Kumar K.V
2008-10-16 10:09:17 -04:00
committed by Theodore Ts'o
parent 74baaaaec8
commit 17bc6c30cf
2 changed files with 16 additions and 3 deletions
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9
include/linux/writeback.h
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@@ -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;
};
/*