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f2fs: relax migratepage for atomic written page 

In order to avoid lock contention for atomic written pages, we'd better give
EBUSY in f2fs_migrate_page when mode is asynchronous. We expect it will be
released soon as transaction commits.

Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2017-07-06 14:46:01 -07:00
parent 000519f278
commit ff1048e7df
1 changed files with 6 additions and 2 deletions
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8
fs/f2fs/data.c
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@ -2203,8 +2203,12 @@ int f2fs_migrate_page(struct address_space *mapping,
BUG_ON(PageWriteback(page));
/* migrating an atomic written page is safe with the inmem_lock hold */
if (atomic_written && !mutex_trylock(&fi->inmem_lock))
return -EAGAIN;
if (atomic_written) {
if (mode != MIGRATE_SYNC)
return -EBUSY;
if (!mutex_trylock(&fi->inmem_lock))
return -EAGAIN;
}
/*
* A reference is expected if PagePrivate set when move mapping,