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Wong" , Randy Dunlap , Jeff Layton , Amir Goldstein , Jonathan Cameron , Stefan Hajnoczi , Joanne Koong , Josef Bacik , Bagas Sanjaya , James Morse , Fuad Tabba , Sean Christopherson , Shivank Garg , Ackerley Tng , Gregory Price , Aravind Ramesh , Ajay Joshi , venkataravis@micron.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, nvdimm@lists.linux.dev, linux-cxl@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: [PATCH V4 17/19] famfs_fuse: Add DAX address_space_operations with noop_dirty_folio Date: Wed, 14 Jan 2026 15:32:04 -0600 Message-ID: <20260114213209.29453-18-john@groves.net> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260114213209.29453-1-john@groves.net> References: <20260114153133.29420.compound@groves.net> <20260114213209.29453-1-john@groves.net> Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: John Groves Famfs is memory-backed; there is no place to write back to, and no reason to mark pages dirty at all. Signed-off-by: John Groves --- fs/fuse/famfs.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/fs/fuse/famfs.c b/fs/fuse/famfs.c index ee3526175b6b..f98e358ea489 100644 --- a/fs/fuse/famfs.c +++ b/fs/fuse/famfs.c @@ -14,6 +14,7 @@ #include #include #include +#include #include #include #include @@ -39,6 +40,15 @@ static const struct dax_holder_operations famfs_fuse_dax_holder_ops = { .notify_failure = famfs_dax_notify_failure, }; +/* + * DAX address_space_operations for famfs. + * famfs doesn't need dirty tracking - writes go directly to + * memory with no writeback required. + */ +static const struct address_space_operations famfs_dax_aops = { + .dirty_folio = noop_dirty_folio, +}; + /*****************************************************************************/ /* @@ -625,6 +635,7 @@ famfs_file_init_dax( } i_size_write(inode, meta->file_size); inode->i_flags |= S_DAX; + inode->i_data.a_ops = &famfs_dax_aops; } unlock_out: inode_unlock(inode); -- 2.52.0