From f4c0a0fdfae708f7aa438c27a380ed4071294e11 Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Fri, 11 Jul 2008 19:27:31 -0400 Subject: vfs: export filemap_fdatawrite_range() Make filemap_fdatawrite_range() function public, so that it can later be used in ordered mode rewrite by JBD/JBD2. Signed-off-by: Jan Kara --- mm/filemap.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'mm') diff --git a/mm/filemap.c b/mm/filemap.c index 1e6a7d34874f..65d9d9e2b755 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -236,11 +236,12 @@ int filemap_fdatawrite(struct address_space *mapping) } EXPORT_SYMBOL(filemap_fdatawrite); -static int filemap_fdatawrite_range(struct address_space *mapping, loff_t start, +int filemap_fdatawrite_range(struct address_space *mapping, loff_t start, loff_t end) { return __filemap_fdatawrite_range(mapping, start, end, WB_SYNC_ALL); } +EXPORT_SYMBOL(filemap_fdatawrite_range); /** * filemap_flush - mostly a non-blocking flush -- cgit v1.2.3 From 06d6cf6959d22037fcec598f4f954db5db3d7356 Mon Sep 17 00:00:00 2001 From: "Aneesh Kumar K.V" Date: Fri, 11 Jul 2008 19:27:31 -0400 Subject: mm: Add range_cont mode for writeback Filesystems like ext4 needs to start a new transaction in the writepages for block allocation. This happens with delayed allocation and there is limit to how many credits we can request from the journal layer. So we call write_cache_pages multiple times with wbc->nr_to_write set to the maximum possible value limitted by the max journal credits available. Add a new mode to writeback that enables us to handle this behaviour. In the new mode we update the wbc->range_start to point to the new offset to be written. Next call to call to write_cache_pages will start writeout from specified range_start offset. In the new mode we also limit writing to the specified wbc->range_end. Signed-off-by: Aneesh Kumar K.V Signed-off-by: Mingming Cao Acked-by: Jan Kara Signed-off-by: "Theodore Ts'o" --- include/linux/writeback.h | 1 + mm/page-writeback.c | 3 +++ 2 files changed, 4 insertions(+) (limited to 'mm') diff --git a/include/linux/writeback.h b/include/linux/writeback.h index f462439cc288..0d8573e6b9ec 100644 --- a/include/linux/writeback.h +++ b/include/linux/writeback.h @@ -63,6 +63,7 @@ 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 */ + unsigned range_cont:1; }; /* diff --git a/mm/page-writeback.c b/mm/page-writeback.c index 789b6adbef37..ded57d528060 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -956,6 +956,9 @@ retry: } if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) mapping->writeback_index = index; + + if (wbc->range_cont) + wbc->range_start = index << PAGE_CACHE_SHIFT; return ret; } EXPORT_SYMBOL(write_cache_pages); -- cgit v1.2.3