tree df0c8215c666c02446cb6bffab81df1e031d436d
parent e6b0b159cf2f62de69561f585fe8515d3d9189d4
author Chao Yu <yuchao0@huawei.com> 1532015874 +0800
committer Jaegeuk Kim <jaegeuk@kernel.org> 1533149556 -0700

f2fs: restrict setting up inode.i_advise

In order to give advise to f2fs to recognize hot/cold file, it is possible
that we can set specific bit in inode.i_advise through setxattr(), but
there are several bits which are used internally, such as encrypt_bit,
keep_size_bit, they should never be changed through setxattr().

So that this patch 1) adds FADVISE_MODIFIABLE_BITS to filter modifiable
bits user given, 2) supports to clear {hot,cold}_file bits.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>