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f2fs: assign REQ_RAHEAD to bio for ->readpages
As Jens reported, we'd better assign REQ_RAHEAD to bio by the fact that ->readpages is called only from read-ahead. In Documentation/filesystems/vfs.txt, readpages: called by the VM to read pages associated with the address_space object. This is essentially just a vector version of readpage. Instead of just one page, several pages are requested. readpages is only used for read-ahead, so read errors are ignored. If anything goes wrong, feel free to give up. Signed-off-by: Jens Axboe <axboe@kernel.dk> Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org> Signed-off-by: khusika <khusikadhamar@gmail.com>
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