1 files changed, 28 insertions, 4 deletions

diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 1cd61652018c..ce0a2838ccd0 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -197,6 +197,7 @@ void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
         struct fuse_conn *fc = get_fuse_conn(inode);
         struct fuse_inode *fi = get_fuse_inode(inode);
         loff_t oldsize;
+        struct timespec old_mtime;
 
         spin_lock(&fc->lock);
         if (attr_version != 0 && fi->attr_version > attr_version) {
@@ -204,15 +205,35 @@ void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
                 return;
         }
 
+        old_mtime = inode->i_mtime;
         fuse_change_attributes_common(inode, attr, attr_valid);
 
         oldsize = inode->i_size;
         i_size_write(inode, attr->size);
         spin_unlock(&fc->lock);
 
-        if (S_ISREG(inode->i_mode) && oldsize != attr->size) {
-                truncate_pagecache(inode, oldsize, attr->size);
-                invalidate_inode_pages2(inode->i_mapping);
+        if (S_ISREG(inode->i_mode)) {
+                bool inval = false;
+
+                if (oldsize != attr->size) {
+                        truncate_pagecache(inode, oldsize, attr->size);
+                        inval = true;
+                } else if (fc->auto_inval_data) {
+                        struct timespec new_mtime = {
+                                .tv_sec = attr->mtime,
+                                .tv_nsec = attr->mtimensec,
+                        };
+
+                        /*
+                         * Auto inval mode also checks and invalidates if mtime
+                         * has changed.
+                         */
+                        if (!timespec_equal(&old_mtime, &new_mtime))
+                                inval = true;
+                }
+
+                if (inval)
+                        invalidate_inode_pages2(inode->i_mapping);
         }
 }
 
@@ -834,6 +855,8 @@ static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
                                 fc->big_writes = 1;
                         if (arg->flags & FUSE_DONT_MASK)
                                 fc->dont_mask = 1;
+                        if (arg->flags & FUSE_AUTO_INVAL_DATA)
+                                fc->auto_inval_data = 1;
                 } else {
                         ra_pages = fc->max_read / PAGE_CACHE_SIZE;
                         fc->no_lock = 1;
@@ -859,7 +882,8 @@ static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req)
         arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE;
         arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC |
                 FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK |
-                FUSE_FLOCK_LOCKS;
+                FUSE_SPLICE_WRITE | FUSE_SPLICE_MOVE | FUSE_SPLICE_READ |
+                FUSE_FLOCK_LOCKS | FUSE_IOCTL_DIR | FUSE_AUTO_INVAL_DATA;
         req->in.h.opcode = FUSE_INIT;
         req->in.numargs = 1;
         req->in.args[0].size = sizeof(*arg);