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| author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2008-10-16 10:09:17 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2008-10-16 10:09:17 -0400 |
| commit | 17bc6c30cf6bfffd816bdc53682dd46fc34a2cf4 (patch) | |
| tree | 9fb9512764e970123c0f44573b0bfd74539744e3 /include/linux/writeback.h | |
| parent | 74baaaaec8b4f22e1ae279f5ecca4ff705b28912 (diff) | |
| download | lwn-17bc6c30cf6bfffd816bdc53682dd46fc34a2cf4.tar.gz lwn-17bc6c30cf6bfffd816bdc53682dd46fc34a2cf4.zip | |
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.h | 9 |
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; }; /* |