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authorKonstantin Khlebnikov <khlebnikov@yandex-team.ru>2019-09-24 00:34:48 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2019-09-25 00:54:08 +0200
commit875d91b11a201276ac3a9ab79f8b0fa3dc4ee8fd (patch)
tree3a74f57e68611b86acf4addb674aca8220dfaa64 /mm/filemap.c
parentmm/filemap.c: don't initiate writeback if mapping has no dirty pages (diff)
downloadlinux-875d91b11a201276ac3a9ab79f8b0fa3dc4ee8fd.tar.xz
linux-875d91b11a201276ac3a9ab79f8b0fa3dc4ee8fd.zip
mm/filemap.c: rewrite mapping_needs_writeback in less fancy manner
This actually checks that writeback is needed or in progress. Link: http://lkml.kernel.org/r/156378817069.1087.1302816672037672488.stgit@buzz Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Cc: Tejun Heo <tj@kernel.org> Cc: Jens Axboe <axboe@kernel.dk> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Jan Kara <jack@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to '')
-rw-r--r--mm/filemap.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/mm/filemap.c b/mm/filemap.c
index 82f3b9a3a940..d5462d706f76 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -618,10 +618,13 @@ int filemap_fdatawait_keep_errors(struct address_space *mapping)
}
EXPORT_SYMBOL(filemap_fdatawait_keep_errors);
+/* Returns true if writeback might be needed or already in progress. */
static bool mapping_needs_writeback(struct address_space *mapping)
{
- return (!dax_mapping(mapping) && mapping->nrpages) ||
- (dax_mapping(mapping) && mapping->nrexceptional);
+ if (dax_mapping(mapping))
+ return mapping->nrexceptional;
+
+ return mapping->nrpages;
}
int filemap_write_and_wait(struct address_space *mapping)