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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>
This commit is contained in:
Konstantin Khlebnikov 2019-09-23 15:34:48 -07:00 committed by Linus Torvalds
parent c3aab9a0bd
commit 875d91b11a
1 changed files with 5 additions and 2 deletions
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7
mm/filemap.c
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@ -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)