DAOS-15682 dfuse: Perform reads in larger chunks.

src/client/dfuse/dfuse.h

@@ -405,6 +405,7 @@ struct dfuse_event {
  union {
  struct dfuse_obj_hdl *de_oh;
  struct dfuse_inode_entry *de_ie;
+ struct read_chunk_data *de_cd;
  };
  off_t de_req_position; /**< The file position requested by fuse */
  union {
@@ -1011,6 +1012,8 @@ struct dfuse_inode_entry {
 
  /* Entry on the evict list */
  d_list_t ie_evict_entry;
+
+ struct read_chunk_core *ie_chunk;
 };
 
 /* Flush write-back cache writes to a inode. It does this by waiting for and then releasing an
@@ -1108,6 +1111,13 @@ dfuse_compute_inode(struct dfuse_cont *dfs,
 void
 dfuse_cache_evict_dir(struct dfuse_info *dfuse_info, struct dfuse_inode_entry *ie);
 
+/* Free any read chunk data for an inode.
+ *
+ * Returns true if feature was used.
+ */
+bool
+read_chunk_close(struct dfuse_inode_entry *ie);
+
 /* Metadata caching functions. */
 
 /* Mark the cache as up-to-date from now */

src/client/dfuse/ops/open.c

@@ -139,6 +139,7 @@ dfuse_cb_release(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi)
  struct dfuse_obj_hdl *oh = (struct dfuse_obj_hdl *)fi->fh;
  struct dfuse_inode_entry *ie = NULL;
  int rc;
+ uint32_t oc;
  uint32_t il_calls;
 
  /* Perform the opposite of what the ioctl call does, always change the open handle count
@@ -206,7 +207,11 @@ dfuse_cb_release(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi)
  if (il_calls != 0) {
  atomic_fetch_sub_relaxed(&oh->doh_ie->ie_il_count, 1);
  }
- atomic_fetch_sub_relaxed(&oh->doh_ie->ie_open_count, 1);
+ oc = atomic_fetch_sub_relaxed(&oh->doh_ie->ie_open_count, 1);
+ if (oc == 1) {
+ if (read_chunk_close(oh->doh_ie))
+ oh->doh_linear_read = true;
+ }
 
  if (oh->doh_evict_on_close) {
  ie = oh->doh_ie;