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authorJeffle Xu <jefflexu@linux.alibaba.com>2021-11-25 10:05:29 +0300
committerMiklos Szeredi <mszeredi@redhat.com>2021-12-14 13:09:37 +0300
commitc3cb6f935e322fa183988032e318b293d9e4fe53 (patch)
tree0c8d38c2b190aa597aa30ff98a9324f926bce7f5 /fs/fuse/dax.c
parent2ee019fadcca343c3deea6a1767965bdf23fc3d0 (diff)
downloadlinux-c3cb6f935e322fa183988032e318b293d9e4fe53.tar.xz
fuse: mark inode DONT_CACHE when per inode DAX hint changes
When the per inode 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 inode 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 inode 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 <jefflexu@linux.alibaba.com> Reviewed-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/fuse/dax.c')
-rw-r--r--fs/fuse/dax.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/fs/fuse/dax.c b/fs/fuse/dax.c
index 663270dc6e20..182b24a14804 100644
--- a/fs/fuse/dax.c
+++ b/fs/fuse/dax.c
@@ -1361,6 +1361,15 @@ 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 (fuse_is_inode_dax_mode(fc->dax_mode) &&
+ ((bool) IS_DAX(inode) != (bool) (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)) {