On Mon, Oct 11, 2021 at 11:00:51AM +0800, Jeffle Xu wrote: > When the per-file DAX hint changes while the file is still *opened*, it > is quite complicated and maybe fragile to dynamically change the DAX > state. > > Hence mark the inode and corresponding dentries as DONE_CACHE once the > per-file DAX hint changes, so that the inode instance will be evicted > and freed as soon as possible once the file is closed and the last > reference to the inode is put. And then when the file gets reopened next > time, the new instantiated inode will reflect the new DAX state. > > In summary, when the per-file DAX hint changes for an *opened* file, the > DAX state of the file won't be updated until this file is closed and > reopened later. > > Signed-off-by: Jeffle Xu <[email protected]> > --- > fs/fuse/dax.c | 9 +++++++++ > fs/fuse/fuse_i.h | 1 + > fs/fuse/inode.c | 3 +++ > 3 files changed, 13 insertions(+) > > diff --git a/fs/fuse/dax.c b/fs/fuse/dax.c > index 15bde36829b8..ca083c13f5e8 100644 > --- a/fs/fuse/dax.c > +++ b/fs/fuse/dax.c > @@ -1364,6 +1364,15 @@ void fuse_dax_inode_init(struct inode *inode, unsigned > int flags) > inode->i_data.a_ops = &fuse_dax_file_aops; > } > > +void fuse_dax_dontcache(struct inode *inode, unsigned int flags) > +{ > + struct fuse_conn *fc = get_fuse_conn(inode); > + > + if (fc->dax_mode == FUSE_DAX_INODE && > + (!!IS_DAX(inode) != !!(flags & FUSE_ATTR_DAX))) > + d_mark_dontcache(inode); > +} > + > bool fuse_dax_check_alignment(struct fuse_conn *fc, unsigned int > map_alignment) > { > if (fc->dax && (map_alignment > FUSE_DAX_SHIFT)) { > diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h > index 0270a41c31d7..bb2c11e0311a 100644 > --- a/fs/fuse/fuse_i.h > +++ b/fs/fuse/fuse_i.h > @@ -1270,6 +1270,7 @@ void fuse_dax_conn_free(struct fuse_conn *fc); > bool fuse_dax_inode_alloc(struct super_block *sb, struct fuse_inode *fi); > void fuse_dax_inode_init(struct inode *inode, unsigned int flags); > void fuse_dax_inode_cleanup(struct inode *inode); > +void fuse_dax_dontcache(struct inode *inode, unsigned int flags); > bool fuse_dax_check_alignment(struct fuse_conn *fc, unsigned int > map_alignment); > void fuse_dax_cancel_work(struct fuse_conn *fc); > > diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c > index 73f19cd6e702..cf934c2ba761 100644 > --- a/fs/fuse/inode.c > +++ b/fs/fuse/inode.c > @@ -268,6 +268,9 @@ void fuse_change_attributes(struct inode *inode, struct > fuse_attr *attr, > if (inval) > invalidate_inode_pages2(inode->i_mapping); > } > + > + if (IS_ENABLED(CONFIG_FUSE_DAX)) > + fuse_dax_dontcache(inode, attr->flags);
Should we give this function more generic name. Say fuse_dax_change_attributes(). And let that function decide what attributes have changed and does it need to take any action. Vivek > } > > static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr) > -- > 2.27.0 > _______________________________________________ Virtio-fs mailing list [email protected] https://listman.redhat.com/mailman/listinfo/virtio-fs
