[PATCH 08/30] virtiofsd: remove unused notify reply support

[Dr. David Alan Gilbert (git)]

From: Stefan Hajnoczi <address@hidden>

Notify reply support is unused by virtiofsd.  The code would need to be
updated to validate input buffer sizes.  Remove this unused code since
changes to it are untestable.

Signed-off-by: Stefan Hajnoczi <address@hidden>
---
 contrib/virtiofsd/fuse_lowlevel.c | 142 +-----------------------------
 contrib/virtiofsd/fuse_lowlevel.h |  47 ----------
 2 files changed, 1 insertion(+), 188 deletions(-)

diff --git a/contrib/virtiofsd/fuse_lowlevel.c 
b/contrib/virtiofsd/fuse_lowlevel.c
index 2f40510707..a36a00e793 100644
--- a/contrib/virtiofsd/fuse_lowlevel.c
+++ b/contrib/virtiofsd/fuse_lowlevel.c
@@ -33,10 +33,6 @@
 #define PARAM(inarg) (((char *)(inarg)) + sizeof(*(inarg)))
 #define OFFSET_MAX 0x7fffffffffffffffLL
 
-#define container_of(ptr, type, member) ({                             \
-                       const typeof( ((type *)0)->member ) *__mptr = (ptr); \
-                       (type *)( (char *)__mptr - offsetof(type,member) );})
-
 struct fuse_pollhandle {
        uint64_t kh;
        struct fuse_session *se;
@@ -1735,51 +1731,6 @@ static void do_destroy(fuse_req_t req, fuse_ino_t 
nodeid, const void *inarg)
        send_reply_ok(req, NULL, 0);
 }
 
-static void list_del_nreq(struct fuse_notify_req *nreq)
-{
-       struct fuse_notify_req *prev = nreq->prev;
-       struct fuse_notify_req *next = nreq->next;
-       prev->next = next;
-       next->prev = prev;
-}
-
-static void list_add_nreq(struct fuse_notify_req *nreq,
-                         struct fuse_notify_req *next)
-{
-       struct fuse_notify_req *prev = next->prev;
-       nreq->next = next;
-       nreq->prev = prev;
-       prev->next = nreq;
-       next->prev = nreq;
-}
-
-static void list_init_nreq(struct fuse_notify_req *nreq)
-{
-       nreq->next = nreq;
-       nreq->prev = nreq;
-}
-
-static void do_notify_reply(fuse_req_t req, fuse_ino_t nodeid,
-                           const void *inarg, const struct fuse_buf *buf)
-{
-       struct fuse_session *se = req->se;
-       struct fuse_notify_req *nreq;
-       struct fuse_notify_req *head;
-
-       pthread_mutex_lock(&se->lock);
-       head = &se->notify_list;
-       for (nreq = head->next; nreq != head; nreq = nreq->next) {
-               if (nreq->unique == req->unique) {
-                       list_del_nreq(nreq);
-                       break;
-               }
-       }
-       pthread_mutex_unlock(&se->lock);
-
-       if (nreq != head)
-               nreq->reply(nreq, req, nodeid, inarg, buf);
-}
-
 static int send_notify_iov(struct fuse_session *se, int notify_code,
                           struct iovec *iov, int count)
 {
@@ -1921,93 +1872,6 @@ int fuse_lowlevel_notify_store(struct fuse_session *se, 
fuse_ino_t ino,
        return res;
 }
 
-struct fuse_retrieve_req {
-       struct fuse_notify_req nreq;
-       void *cookie;
-};
-
-static void fuse_ll_retrieve_reply(struct fuse_notify_req *nreq,
-                                  fuse_req_t req, fuse_ino_t ino,
-                                  const void *inarg,
-                                  const struct fuse_buf *ibuf)
-{
-       struct fuse_session *se = req->se;
-       struct fuse_retrieve_req *rreq =
-               container_of(nreq, struct fuse_retrieve_req, nreq);
-       const struct fuse_notify_retrieve_in *arg = inarg;
-       struct fuse_bufvec bufv = {
-               .buf[0] = *ibuf,
-               .count = 1,
-       };
-
-       if (!(bufv.buf[0].flags & FUSE_BUF_IS_FD))
-               bufv.buf[0].mem = PARAM(arg);
-
-       bufv.buf[0].size -= sizeof(struct fuse_in_header) +
-               sizeof(struct fuse_notify_retrieve_in);
-
-       if (bufv.buf[0].size < arg->size) {
-               fuse_log(FUSE_LOG_ERR, "fuse: retrieve reply: buffer size too 
small\n");
-               fuse_reply_none(req);
-               goto out;
-       }
-       bufv.buf[0].size = arg->size;
-
-       if (se->op.retrieve_reply) {
-               se->op.retrieve_reply(req, rreq->cookie, ino,
-                                         arg->offset, &bufv);
-       } else {
-               fuse_reply_none(req);
-       }
-out:
-       free(rreq);
-}
-
-int fuse_lowlevel_notify_retrieve(struct fuse_session *se, fuse_ino_t ino,
-                                 size_t size, off_t offset, void *cookie)
-{
-       struct fuse_notify_retrieve_out outarg;
-       struct iovec iov[2];
-       struct fuse_retrieve_req *rreq;
-       int err;
-
-       if (!se)
-               return -EINVAL;
-
-       if (se->conn.proto_major < 6 || se->conn.proto_minor < 15)
-               return -ENOSYS;
-
-       rreq = malloc(sizeof(*rreq));
-       if (rreq == NULL)
-               return -ENOMEM;
-
-       pthread_mutex_lock(&se->lock);
-       rreq->cookie = cookie;
-       rreq->nreq.unique = se->notify_ctr++;
-       rreq->nreq.reply = fuse_ll_retrieve_reply;
-       list_add_nreq(&rreq->nreq, &se->notify_list);
-       pthread_mutex_unlock(&se->lock);
-
-       outarg.notify_unique = rreq->nreq.unique;
-       outarg.nodeid = ino;
-       outarg.offset = offset;
-       outarg.size = size;
-       outarg.padding = 0;
-
-       iov[1].iov_base = &outarg;
-       iov[1].iov_len = sizeof(outarg);
-
-       err = send_notify_iov(se, FUSE_NOTIFY_RETRIEVE, iov, 2);
-       if (err) {
-               pthread_mutex_lock(&se->lock);
-               list_del_nreq(&rreq->nreq);
-               pthread_mutex_unlock(&se->lock);
-               free(rreq);
-       }
-
-       return err;
-}
-
 void *fuse_req_userdata(fuse_req_t req)
 {
        return req->se->userdata;
@@ -2085,7 +1949,7 @@ static struct {
        [FUSE_POLL]        = { do_poll,        "POLL"        },
        [FUSE_FALLOCATE]   = { do_fallocate,   "FALLOCATE"   },
        [FUSE_DESTROY]     = { do_destroy,     "DESTROY"     },
-       [FUSE_NOTIFY_REPLY] = { (void *) 1,    "NOTIFY_REPLY" },
+       [FUSE_NOTIFY_REPLY] = { NULL,    "NOTIFY_REPLY" },
        [FUSE_BATCH_FORGET] = { do_batch_forget, "BATCH_FORGET" },
        [FUSE_READDIRPLUS] = { do_readdirplus,  "READDIRPLUS"},
        [FUSE_RENAME2]     = { do_rename2,      "RENAME2"    },
@@ -2185,8 +2049,6 @@ void fuse_session_process_buf_int(struct fuse_session *se,
        inarg = (void *) &in[1];
        if (in->opcode == FUSE_WRITE && se->op.write_buf)
                do_write_buf(req, in->nodeid, inarg, buf);
-       else if (in->opcode == FUSE_NOTIFY_REPLY)
-               do_notify_reply(req, in->nodeid, inarg, buf);
        else
                fuse_ll_ops[in->opcode].func(req, in->nodeid, inarg);
 
@@ -2297,8 +2159,6 @@ struct fuse_session *fuse_session_new(struct fuse_args 
*args,
 
        list_init_req(&se->list);
        list_init_req(&se->interrupts);
-       list_init_nreq(&se->notify_list);
-       se->notify_ctr = 1;
        fuse_mutex_init(&se->lock);
 
        memcpy(&se->op, op, op_size);
diff --git a/contrib/virtiofsd/fuse_lowlevel.h 
b/contrib/virtiofsd/fuse_lowlevel.h
index b0566ea21d..018e7c0be0 100644
--- a/contrib/virtiofsd/fuse_lowlevel.h
+++ b/contrib/virtiofsd/fuse_lowlevel.h
@@ -1085,21 +1085,6 @@ struct fuse_lowlevel_ops {
                           struct fuse_bufvec *bufv, off_t off,
                           struct fuse_file_info *fi);
 
-       /**
-        * Callback function for the retrieve request
-        *
-        * Valid replies:
-        *      fuse_reply_none
-        *
-        * @param req request handle
-        * @param cookie user data supplied to fuse_lowlevel_notify_retrieve()
-        * @param ino the inode number supplied to 
fuse_lowlevel_notify_retrieve()
-        * @param offset the offset supplied to fuse_lowlevel_notify_retrieve()
-        * @param bufv the buffer containing the returned data
-        */
-       void (*retrieve_reply) (fuse_req_t req, void *cookie, fuse_ino_t ino,
-                               off_t offset, struct fuse_bufvec *bufv);
-
        /**
         * Forget about multiple inodes
         *
@@ -1696,38 +1681,6 @@ int fuse_lowlevel_notify_delete(struct fuse_session *se,
 int fuse_lowlevel_notify_store(struct fuse_session *se, fuse_ino_t ino,
                               off_t offset, struct fuse_bufvec *bufv,
                               enum fuse_buf_copy_flags flags);
-/**
- * Retrieve data from the kernel buffers
- *
- * Retrieve data in the kernel buffers belonging to the given inode.
- * If successful then the retrieve_reply() method will be called with
- * the returned data.
- *
- * Only present pages are returned in the retrieve reply.  Retrieving
- * stops when it finds a non-present page and only data prior to that
- * is returned.
- *
- * If this function returns an error, then the retrieve will not be
- * completed and no reply will be sent.
- *
- * This function doesn't change the dirty state of pages in the kernel
- * buffer.  For dirty pages the write() method will be called
- * regardless of having been retrieved previously.
- *
- * Added in FUSE protocol version 7.15. If the kernel does not support
- * this (or a newer) version, the function will return -ENOSYS and do
- * nothing.
- *
- * @param se the session object
- * @param ino the inode number
- * @param size the number of bytes to retrieve
- * @param offset the starting offset into the file to retrieve from
- * @param cookie user data to supply to the reply callback
- * @return zero for success, -errno for failure
- */
-int fuse_lowlevel_notify_retrieve(struct fuse_session *se, fuse_ino_t ino,
-                                 size_t size, off_t offset, void *cookie);
-
 
 /* ----------------------------------------------------------- *
  * Utility functions                                          *
-- 
2.23.0