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+creating a call stub and pausing a call
+---------------------------------------
+libglusterfs provides seperate API to pause each of the fop. parameters to each API is
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+ NOTE: @fn should exactly take the same type and number of parameters that
+ the corresponding regular fop takes.
+rest will be the regular parameters to corresponding fop.
+
+NOTE: @frame can never be NULL. fop_<operation>_stub() fails with errno
+ set to EINVAL, if @frame is NULL. also wherever @loc is applicable,
+ @loc cannot be NULL.
+
+refer to individual stub creation API to know about call-stub creation's behaviour with
+specific parameters.
+
+here is the list of stub creation APIs for xlator fops.
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@loc - pointer to location structure.
+ NOTE: @loc will be copied to a different location, with inode_ref() to
+ @loc->inode and @loc->parent, if not NULL. also @loc->path will be
+ copied to a different location.
+@need_xattr - flag to specify if xattr should be returned or not.
+call_stub_t *
+fop_lookup_stub (call_frame_t *frame,
+ fop_lookup_t fn,
+ loc_t *loc,
+ int32_t need_xattr);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@loc - pointer to location structure.
+ NOTE: @loc will be copied to a different location, with inode_ref() to
+ @loc->inode and @loc->parent, if not NULL. also @loc->path will be
+ copied to a different location.
+call_stub_t *
+fop_stat_stub (call_frame_t *frame,
+ fop_stat_t fn,
+ loc_t *loc);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@fd - file descriptor parameter to lk fop.
+ NOTE: @fd is stored with a fd_ref().
+call_stub_t *
+fop_fstat_stub (call_frame_t *frame,
+ fop_fstat_t fn,
+ fd_t *fd);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@loc - pointer to location structure.
+ NOTE: @loc will be copied to a different location, with inode_ref() to @loc->inode and
+ @loc->parent, if not NULL. also @loc->path will be copied to a different location.
+@mode - mode parameter to chmod.
+call_stub_t *
+fop_chmod_stub (call_frame_t *frame,
+ fop_chmod_t fn,
+ loc_t *loc,
+ mode_t mode);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@fd - file descriptor parameter to lk fop.
+ NOTE: @fd is stored with a fd_ref().
+@mode - mode parameter for fchmod fop.
+call_stub_t *
+fop_fchmod_stub (call_frame_t *frame,
+ fop_fchmod_t fn,
+ fd_t *fd,
+ mode_t mode);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@loc - pointer to location structure.
+ NOTE: @loc will be copied to a different location, with inode_ref() to @loc->inode and
+ @loc->parent, if not NULL. also @loc->path will be copied to a different location.
+@uid - uid parameter to chown.
+@gid - gid parameter to chown.
+call_stub_t *
+fop_chown_stub (call_frame_t *frame,
+ fop_chown_t fn,
+ loc_t *loc,
+ uid_t uid,
+ gid_t gid);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@fd - file descriptor parameter to lk fop.
+ NOTE: @fd is stored with a fd_ref().
+@uid - uid parameter to fchown.
+@gid - gid parameter to fchown.
+call_stub_t *
+fop_fchown_stub (call_frame_t *frame,
+ fop_fchown_t fn,
+ fd_t *fd,
+ uid_t uid,
+ gid_t gid);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@loc - pointer to location structure.
+ NOTE: @loc will be copied to a different location, with inode_ref() to
+ @loc->inode and @loc->parent, if not NULL. also @loc->path will be
+ copied to a different location, if not NULL.
+@off - offset parameter to truncate fop.
+call_stub_t *
+fop_truncate_stub (call_frame_t *frame,
+ fop_truncate_t fn,
+ loc_t *loc,
+ off_t off);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@fd - file descriptor parameter to lk fop.
+ NOTE: @fd is stored with a fd_ref().
+@off - offset parameter to ftruncate fop.
+call_stub_t *
+fop_ftruncate_stub (call_frame_t *frame,
+ fop_ftruncate_t fn,
+ fd_t *fd,
+ off_t off);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@loc - pointer to location structure.
+ NOTE: @loc will be copied to a different location, with inode_ref() to
+ @loc->inode and @loc->parent, if not NULL. also @loc->path will be
+ copied to a different location.
+@tv - tv parameter to utimens fop.
+call_stub_t *
+fop_utimens_stub (call_frame_t *frame,
+ fop_utimens_t fn,
+ loc_t *loc,
+ struct timespec tv[2]);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@loc - pointer to location structure.
+ NOTE: @loc will be copied to a different location, with inode_ref() to
+ @loc->inode and @loc->parent, if not NULL. also @loc->path will be
+ copied to a different location.
+@mask - mask parameter for access fop.
+call_stub_t *
+fop_access_stub (call_frame_t *frame,
+ fop_access_t fn,
+ loc_t *loc,
+ int32_t mask);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@loc - pointer to location structure.
+ NOTE: @loc will be copied to a different location, with inode_ref() to
+ @loc->inode and @loc->parent, if not NULL. also @loc->path will be
+ copied to a different location.
+@size - size parameter to readlink fop.
+call_stub_t *
+fop_readlink_stub (call_frame_t *frame,
+ fop_readlink_t fn,
+ loc_t *loc,
+ size_t size);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@loc - pointer to location structure.
+ NOTE: @loc will be copied to a different location, with inode_ref() to
+ @loc->inode and @loc->parent, if not NULL. also @loc->path will be
+ copied to a different location.
+@mode - mode parameter to mknod fop.
+@rdev - rdev parameter to mknod fop.
+call_stub_t *
+fop_mknod_stub (call_frame_t *frame,
+ fop_mknod_t fn,
+ loc_t *loc,
+ mode_t mode,
+ dev_t rdev);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@loc - pointer to location structure.
+ NOTE: @loc will be copied to a different location, with inode_ref() to
+ @loc->inode and @loc->parent, if not NULL. also @loc->path will be
+ copied to a different location.
+@mode - mode parameter to mkdir fop.
+call_stub_t *
+fop_mkdir_stub (call_frame_t *frame,
+ fop_mkdir_t fn,
+ loc_t *loc,
+ mode_t mode);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@loc - pointer to location structure.
+ NOTE: @loc will be copied to a different location, with inode_ref() to
+ @loc->inode and @loc->parent, if not NULL. also @loc->path will be
+ copied to a different location.
+call_stub_t *
+fop_unlink_stub (call_frame_t *frame,
+ fop_unlink_t fn,
+ loc_t *loc);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@loc - pointer to location structure.
+ NOTE: @loc will be copied to a different location, with inode_ref() to
+ @loc->inode and @loc->parent, if not NULL. also @loc->path will be
+ copied to a different location.
+call_stub_t *
+fop_rmdir_stub (call_frame_t *frame,
+ fop_rmdir_t fn,
+ loc_t *loc);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@linkname - linkname parameter to symlink fop.
+@loc - pointer to location structure.
+ NOTE: @loc will be copied to a different location, with inode_ref() to
+ @loc->inode and @loc->parent, if not NULL. also @loc->path will be
+ copied to a different location.
+call_stub_t *
+fop_symlink_stub (call_frame_t *frame,
+ fop_symlink_t fn,
+ const char *linkname,
+ loc_t *loc);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@oldloc - pointer to location structure.
+ NOTE: @oldloc will be copied to a different location, with inode_ref() to
+ @oldloc->inode and @oldloc->parent, if not NULL. also @oldloc->path will
+ be copied to a different location, if not NULL.
+@newloc - pointer to location structure.
+ NOTE: @newloc will be copied to a different location, with inode_ref() to
+ @newloc->inode and @newloc->parent, if not NULL. also @newloc->path will
+ be copied to a different location, if not NULL.
+call_stub_t *
+fop_rename_stub (call_frame_t *frame,
+ fop_rename_t fn,
+ loc_t *oldloc,
+ loc_t *newloc);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@loc - pointer to location structure.
+ NOTE: @loc will be copied to a different location, with inode_ref() to
+ @loc->inode and @loc->parent, if not NULL. also @loc->path will be
+ copied to a different location.
+@newpath - newpath parameter to link fop.
+call_stub_t *
+fop_link_stub (call_frame_t *frame,
+ fop_link_t fn,
+ loc_t *oldloc,
+ const char *newpath);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@loc - pointer to location structure.
+ NOTE: @loc will be copied to a different location, with inode_ref() to
+ @loc->inode and @loc->parent, if not NULL. also @loc->path will be
+ copied to a different location.
+@flags - flags parameter to create fop.
+@mode - mode parameter to create fop.
+@fd - file descriptor parameter to create fop.
+ NOTE: @fd is stored with a fd_ref().
+call_stub_t *
+fop_create_stub (call_frame_t *frame,
+ fop_create_t fn,
+ loc_t *loc,
+ int32_t flags,
+ mode_t mode, fd_t *fd);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@flags - flags parameter to open fop.
+@loc - pointer to location structure.
+ NOTE: @loc will be copied to a different location, with inode_ref() to
+ @loc->inode and @loc->parent, if not NULL. also @loc->path will be
+ copied to a different location.
+call_stub_t *
+fop_open_stub (call_frame_t *frame,
+ fop_open_t fn,
+ loc_t *loc,
+ int32_t flags,
+ fd_t *fd);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@fd - file descriptor parameter to lk fop.
+ NOTE: @fd is stored with a fd_ref().
+@size - size parameter to readv fop.
+@off - offset parameter to readv fop.
+call_stub_t *
+fop_readv_stub (call_frame_t *frame,
+ fop_readv_t fn,
+ fd_t *fd,
+ size_t size,
+ off_t off);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@fd - file descriptor parameter to lk fop.
+ NOTE: @fd is stored with a fd_ref().
+@vector - vector parameter to writev fop.
+ NOTE: @vector is iov_dup()ed while creating stub. and frame->root->req_refs
+ dictionary is dict_ref()ed.
+@count - count parameter to writev fop.
+@off - off parameter to writev fop.
+call_stub_t *
+fop_writev_stub (call_frame_t *frame,
+ fop_writev_t fn,
+ fd_t *fd,
+ struct iovec *vector,
+ int32_t count,
+ off_t off);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@fd - file descriptor parameter to flush fop.
+ NOTE: @fd is stored with a fd_ref().
+call_stub_t *
+fop_flush_stub (call_frame_t *frame,
+ fop_flush_t fn,
+ fd_t *fd);
+
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@fd - file descriptor parameter to lk fop.
+ NOTE: @fd is stored with a fd_ref().
+@datasync - datasync parameter to fsync fop.
+call_stub_t *
+fop_fsync_stub (call_frame_t *frame,
+ fop_fsync_t fn,
+ fd_t *fd,
+ int32_t datasync);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@loc - pointer to location structure.
+ NOTE: @loc will be copied to a different location, with inode_ref() to @loc->inode and
+ @loc->parent, if not NULL. also @loc->path will be copied to a different location.
+@fd - file descriptor parameter to opendir fop.
+ NOTE: @fd is stored with a fd_ref().
+call_stub_t *
+fop_opendir_stub (call_frame_t *frame,
+ fop_opendir_t fn,
+ loc_t *loc,
+ fd_t *fd);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@fd - file descriptor parameter to getdents fop.
+ NOTE: @fd is stored with a fd_ref().
+@size - size parameter to getdents fop.
+@off - off parameter to getdents fop.
+@flags - flags parameter to getdents fop.
+call_stub_t *
+fop_getdents_stub (call_frame_t *frame,
+ fop_getdents_t fn,
+ fd_t *fd,
+ size_t size,
+ off_t off,
+ int32_t flag);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@fd - file descriptor parameter to setdents fop.
+ NOTE: @fd is stored with a fd_ref().
+@flags - flags parameter to setdents fop.
+@entries - entries parameter to setdents fop.
+call_stub_t *
+fop_setdents_stub (call_frame_t *frame,
+ fop_setdents_t fn,
+ fd_t *fd,
+ int32_t flags,
+ dir_entry_t *entries,
+ int32_t count);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@fd - file descriptor parameter to setdents fop.
+ NOTE: @fd is stored with a fd_ref().
+@datasync - datasync parameter to fsyncdir fop.
+call_stub_t *
+fop_fsyncdir_stub (call_frame_t *frame,
+ fop_fsyncdir_t fn,
+ fd_t *fd,
+ int32_t datasync);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@loc - pointer to location structure.
+ NOTE: @loc will be copied to a different location, with inode_ref() to
+ @loc->inode and @loc->parent, if not NULL. also @loc->path will be
+ copied to a different location.
+call_stub_t *
+fop_statfs_stub (call_frame_t *frame,
+ fop_statfs_t fn,
+ loc_t *loc);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@loc - pointer to location structure.
+ NOTE: @loc will be copied to a different location, with inode_ref() to
+ @loc->inode and @loc->parent, if not NULL. also @loc->path will be
+ copied to a different location.
+@dict - dict parameter to setxattr fop.
+ NOTE: stub creation procedure stores @dict pointer with dict_ref() to it.
+call_stub_t *
+fop_setxattr_stub (call_frame_t *frame,
+ fop_setxattr_t fn,
+ loc_t *loc,
+ dict_t *dict,
+ int32_t flags);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@loc - pointer to location structure.
+ NOTE: @loc will be copied to a different location, with inode_ref() to
+ @loc->inode and @loc->parent, if not NULL. also @loc->path will be
+ copied to a different location.
+@name - name parameter to getxattr fop.
+call_stub_t *
+fop_getxattr_stub (call_frame_t *frame,
+ fop_getxattr_t fn,
+ loc_t *loc,
+ const char *name);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@loc - pointer to location structure.
+ NOTE: @loc will be copied to a different location, with inode_ref() to
+ @loc->inode and @loc->parent, if not NULL. also @loc->path will be
+ copied to a different location.
+@name - name parameter to removexattr fop.
+ NOTE: name string will be copied to a different location while creating stub.
+call_stub_t *
+fop_removexattr_stub (call_frame_t *frame,
+ fop_removexattr_t fn,
+ loc_t *loc,
+ const char *name);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@fd - file descriptor parameter to lk fop.
+ NOTE: @fd is stored with a fd_ref().
+@cmd - command parameter to lk fop.
+@lock - lock parameter to lk fop.
+ NOTE: lock will be copied to a different location while creating stub.
+call_stub_t *
+fop_lk_stub (call_frame_t *frame,
+ fop_lk_t fn,
+ fd_t *fd,
+ int32_t cmd,
+ struct flock *lock);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@fd - fd parameter to gf_lk fop.
+ NOTE: @fd is fd_ref()ed while creating stub, if not NULL.
+@cmd - cmd parameter to gf_lk fop.
+@lock - lock paramater to gf_lk fop.
+ NOTE: @lock is copied to a different memory location while creating
+ stub.
+call_stub_t *
+fop_gf_lk_stub (call_frame_t *frame,
+ fop_gf_lk_t fn,
+ fd_t *fd,
+ int32_t cmd,
+ struct flock *lock);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@fd - file descriptor parameter to readdir fop.
+ NOTE: @fd is stored with a fd_ref().
+@size - size parameter to readdir fop.
+@off - offset parameter to readdir fop.
+call_stub_t *
+fop_readdir_stub (call_frame_t *frame,
+ fop_readdir_t fn,
+ fd_t *fd,
+ size_t size,
+ off_t off);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@loc - pointer to location structure.
+ NOTE: @loc will be copied to a different location, with inode_ref() to
+ @loc->inode and @loc->parent, if not NULL. also @loc->path will be
+ copied to a different location.
+@flags - flags parameter to checksum fop.
+call_stub_t *
+fop_checksum_stub (call_frame_t *frame,
+ fop_checksum_t fn,
+ loc_t *loc,
+ int32_t flags);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@op_ret - op_ret parameter to @fn.
+@op_errno - op_errno parameter to @fn.
+@inode - inode parameter to @fn.
+ NOTE: @inode pointer is stored with a inode_ref().
+@buf - buf parameter to @fn.
+ NOTE: @buf is copied to a different memory location, if not NULL.
+@dict - dict parameter to @fn.
+ NOTE: @dict pointer is stored with dict_ref().
+call_stub_t *
+fop_lookup_cbk_stub (call_frame_t *frame,
+ fop_lookup_cbk_t fn,
+ int32_t op_ret,
+ int32_t op_errno,
+ inode_t *inode,
+ struct stat *buf,
+ dict_t *dict);
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@op_ret - op_ret parameter to @fn.
+@op_errno - op_errno parameter to @fn.
+@buf - buf parameter to @fn.
+ NOTE: @buf is copied to a different memory location, if not NULL.
+call_stub_t *
+fop_stat_cbk_stub (call_frame_t *frame,
+ fop_stat_cbk_t fn,
+ int32_t op_ret,
+ int32_t op_errno,
+ struct stat *buf);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@op_ret - op_ret parameter to @fn.
+@op_errno - op_errno parameter to @fn.
+@buf - buf parameter to @fn.
+ NOTE: @buf is copied to a different memory location, if not NULL.
+call_stub_t *
+fop_fstat_cbk_stub (call_frame_t *frame,
+ fop_fstat_cbk_t fn,
+ int32_t op_ret,
+ int32_t op_errno,
+ struct stat *buf);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@op_ret - op_ret parameter to @fn.
+@op_errno - op_errno parameter to @fn.
+@buf - buf parameter to @fn.
+ NOTE: @buf is copied to a different memory location, if not NULL.
+call_stub_t *
+fop_chmod_cbk_stub (call_frame_t *frame,
+ fop_chmod_cbk_t fn,
+ int32_t op_ret,
+ int32_t op_errno,
+ struct stat *buf);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@op_ret - op_ret parameter to @fn.
+@op_errno - op_errno parameter to @fn.
+@buf - buf parameter to @fn.
+ NOTE: @buf is copied to a different memory location, if not NULL.
+call_stub_t *
+fop_fchmod_cbk_stub (call_frame_t *frame,
+ fop_fchmod_cbk_t fn,
+ int32_t op_ret,
+ int32_t op_errno,
+ struct stat *buf);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@op_ret - op_ret parameter to @fn.
+@op_errno - op_errno parameter to @fn.
+@buf - buf parameter to @fn.
+ NOTE: @buf is copied to a different memory location, if not NULL.
+call_stub_t *
+fop_chown_cbk_stub (call_frame_t *frame,
+ fop_chown_cbk_t fn,
+ int32_t op_ret,
+ int32_t op_errno,
+ struct stat *buf);
+
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@op_ret - op_ret parameter to @fn.
+@op_errno - op_errno parameter to @fn.
+@buf - buf parameter to @fn.
+ NOTE: @buf is copied to a different memory location, if not NULL.
+call_stub_t *
+fop_fchown_cbk_stub (call_frame_t *frame,
+ fop_fchown_cbk_t fn,
+ int32_t op_ret,
+ int32_t op_errno,
+ struct stat *buf);
+
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@op_ret - op_ret parameter to @fn.
+@op_errno - op_errno parameter to @fn.
+@buf - buf parameter to @fn.
+ NOTE: @buf is copied to a different memory location, if not NULL.
+call_stub_t *
+fop_truncate_cbk_stub (call_frame_t *frame,
+ fop_truncate_cbk_t fn,
+ int32_t op_ret,
+ int32_t op_errno,
+ struct stat *buf);
+
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@op_ret - op_ret parameter to @fn.
+@op_errno - op_errno parameter to @fn.
+@buf - buf parameter to @fn.
+ NOTE: @buf is copied to a different memory location, if not NULL.
+call_stub_t *
+fop_ftruncate_cbk_stub (call_frame_t *frame,
+ fop_ftruncate_cbk_t fn,
+ int32_t op_ret,
+ int32_t op_errno,
+ struct stat *buf);
+
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@op_ret - op_ret parameter to @fn.
+@op_errno - op_errno parameter to @fn.
+@buf - buf parameter to @fn.
+ NOTE: @buf is copied to a different memory location, if not NULL.
+call_stub_t *
+fop_utimens_cbk_stub (call_frame_t *frame,
+ fop_utimens_cbk_t fn,
+ int32_t op_ret,
+ int32_t op_errno,
+ struct stat *buf);
+
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@op_ret - op_ret parameter to @fn.
+@op_errno - op_errno parameter to @fn.
+call_stub_t *
+fop_access_cbk_stub (call_frame_t *frame,
+ fop_access_cbk_t fn,
+ int32_t op_ret,
+ int32_t op_errno);
+
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@op_ret - op_ret parameter to @fn.
+@op_errno - op_errno parameter to @fn.
+@path - path parameter to @fn.
+ NOTE: @path is copied to a different memory location, if not NULL.
+call_stub_t *
+fop_readlink_cbk_stub (call_frame_t *frame,
+ fop_readlink_cbk_t fn,
+ int32_t op_ret,
+ int32_t op_errno,
+ const char *path);
+
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@op_ret - op_ret parameter to @fn.
+@op_errno - op_errno parameter to @fn.
+@inode - inode parameter to @fn.
+ NOTE: @inode pointer is stored with a inode_ref().
+@buf - buf parameter to @fn.
+ NOTE: @buf is copied to a different memory location, if not NULL.
+call_stub_t *
+fop_mknod_cbk_stub (call_frame_t *frame,
+ fop_mknod_cbk_t fn,
+ int32_t op_ret,
+ int32_t op_errno,
+ inode_t *inode,
+ struct stat *buf);
+
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@op_ret - op_ret parameter to @fn.
+@op_errno - op_errno parameter to @fn.
+@inode - inode parameter to @fn.
+ NOTE: @inode pointer is stored with a inode_ref().
+@buf - buf parameter to @fn.
+ NOTE: @buf is copied to a different memory location, if not NULL.
+call_stub_t *
+fop_mkdir_cbk_stub (call_frame_t *frame,
+ fop_mkdir_cbk_t fn,
+ int32_t op_ret,
+ int32_t op_errno,
+ inode_t *inode,
+ struct stat *buf);
+
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@op_ret - op_ret parameter to @fn.
+@op_errno - op_errno parameter to @fn.
+call_stub_t *
+fop_unlink_cbk_stub (call_frame_t *frame,
+ fop_unlink_cbk_t fn,
+ int32_t op_ret,
+ int32_t op_errno);
+
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@op_ret - op_ret parameter to @fn.
+@op_errno - op_errno parameter to @fn.
+call_stub_t *
+fop_rmdir_cbk_stub (call_frame_t *frame,
+ fop_rmdir_cbk_t fn,
+ int32_t op_ret,
+ int32_t op_errno);
+
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@op_ret - op_ret parameter to @fn.
+@op_errno - op_errno parameter to @fn.
+@inode - inode parameter to @fn.
+ NOTE: @inode pointer is stored with a inode_ref().
+@buf - buf parameter to @fn.
+ NOTE: @buf is copied to a different memory location, if not NULL.
+call_stub_t *
+fop_symlink_cbk_stub (call_frame_t *frame,
+ fop_symlink_cbk_t fn,
+ int32_t op_ret,
+ int32_t op_errno,
+ inode_t *inode,
+ struct stat *buf);
+
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@op_ret - op_ret parameter to @fn.
+@op_errno - op_errno parameter to @fn.
+@buf - buf parameter to @fn.
+ NOTE: @buf is copied to a different memory location, if not NULL.
+call_stub_t *
+fop_rename_cbk_stub (call_frame_t *frame,
+ fop_rename_cbk_t fn,
+ int32_t op_ret,
+ int32_t op_errno,
+ struct stat *buf);
+
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@op_ret - op_ret parameter to @fn.
+@op_errno - op_errno parameter to @fn.
+@inode - inode parameter to @fn.
+ NOTE: @inode pointer is stored with a inode_ref().
+@buf - buf parameter to @fn.
+ NOTE: @buf is copied to a different memory location, if not NULL.
+call_stub_t *
+fop_link_cbk_stub (call_frame_t *frame,
+ fop_link_cbk_t fn,
+ int32_t op_ret,
+ int32_t op_errno,
+ inode_t *inode,
+ struct stat *buf);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@op_ret - op_ret parameter to @fn.
+@op_errno - op_errno parameter to @fn.
+@fd - fd parameter to @fn.
+ NOTE: @fd pointer is stored with a fd_ref().
+@inode - inode parameter to @fn.
+ NOTE: @inode pointer is stored with a inode_ref().
+@buf - buf parameter to @fn.
+ NOTE: @buf is copied to a different memory location, if not NULL.
+call_stub_t *
+fop_create_cbk_stub (call_frame_t *frame,
+ fop_create_cbk_t fn,
+ int32_t op_ret,
+ int32_t op_errno,
+ fd_t *fd,
+ inode_t *inode,
+ struct stat *buf);
+
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@op_ret - op_ret parameter to @fn.
+@op_errno - op_errno parameter to @fn.
+@fd - fd parameter to @fn.
+ NOTE: @fd pointer is stored with a fd_ref().
+call_stub_t *
+fop_open_cbk_stub (call_frame_t *frame,
+ fop_open_cbk_t fn,
+ int32_t op_ret,
+ int32_t op_errno,
+ fd_t *fd);
+
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@op_ret - op_ret parameter to @fn.
+@op_errno - op_errno parameter to @fn.
+@vector - vector parameter to @fn.
+ NOTE: @vector is copied to a different memory location, if not NULL. also
+ frame->root->rsp_refs is dict_ref()ed.
+@stbuf - stbuf parameter to @fn.
+ NOTE: @stbuf is copied to a different memory location, if not NULL.
+call_stub_t *
+fop_readv_cbk_stub (call_frame_t *frame,
+ fop_readv_cbk_t fn,
+ int32_t op_ret,
+ int32_t op_errno,
+ struct iovec *vector,
+ int32_t count,
+ struct stat *stbuf);
+
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@op_ret - op_ret parameter to @fn.
+@op_errno - op_errno parameter to @fn.
+@stbuf - stbuf parameter to @fn.
+ NOTE: @stbuf is copied to a different memory location, if not NULL.
+call_stub_t *
+fop_writev_cbk_stub (call_frame_t *frame,
+ fop_writev_cbk_t fn,
+ int32_t op_ret,
+ int32_t op_errno,
+ struct stat *stbuf);
+
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@op_ret - op_ret parameter to @fn.
+@op_errno - op_errno parameter to @fn.
+call_stub_t *
+fop_flush_cbk_stub (call_frame_t *frame,
+ fop_flush_cbk_t fn,
+ int32_t op_ret,
+ int32_t op_errno);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@op_ret - op_ret parameter to @fn.
+@op_errno - op_errno parameter to @fn.
+call_stub_t *
+fop_fsync_cbk_stub (call_frame_t *frame,
+ fop_fsync_cbk_t fn,
+ int32_t op_ret,
+ int32_t op_errno);
+
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@op_ret - op_ret parameter to @fn.
+@op_errno - op_errno parameter to @fn.
+@fd - fd parameter to @fn.
+ NOTE: @fd pointer is stored with a fd_ref().
+call_stub_t *
+fop_opendir_cbk_stub (call_frame_t *frame,
+ fop_opendir_cbk_t fn,
+ int32_t op_ret,
+ int32_t op_errno,
+ fd_t *fd);
+
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@op_ret - op_ret parameter to @fn.
+@op_errno - op_errno parameter to @fn.
+@entries - entries parameter to @fn.
+@count - count parameter to @fn.
+call_stub_t *
+fop_getdents_cbk_stub (call_frame_t *frame,
+ fop_getdents_cbk_t fn,
+ int32_t op_ret,
+ int32_t op_errno,
+ dir_entry_t *entries,
+ int32_t count);
+
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@op_ret - op_ret parameter to @fn.
+@op_errno - op_errno parameter to @fn.
+call_stub_t *
+fop_setdents_cbk_stub (call_frame_t *frame,
+ fop_setdents_cbk_t fn,
+ int32_t op_ret,
+ int32_t op_errno);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@op_ret - op_ret parameter to @fn.
+@op_errno - op_errno parameter to @fn.
+call_stub_t *
+fop_fsyncdir_cbk_stub (call_frame_t *frame,
+ fop_fsyncdir_cbk_t fn,
+ int32_t op_ret,
+ int32_t op_errno);
+
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@op_ret - op_ret parameter to @fn.
+@op_errno - op_errno parameter to @fn.
+@buf - buf parameter to @fn.
+ NOTE: @buf is copied to a different memory location, if not NULL.
+call_stub_t *
+fop_statfs_cbk_stub (call_frame_t *frame,
+ fop_statfs_cbk_t fn,
+ int32_t op_ret,
+ int32_t op_errno,
+ struct statvfs *buf);
+
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@op_ret - op_ret parameter to @fn.
+@op_errno - op_errno parameter to @fn.
+call_stub_t *
+fop_setxattr_cbk_stub (call_frame_t *frame,
+ fop_setxattr_cbk_t fn,
+ int32_t op_ret,
+ int32_t op_errno);
+
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@op_ret - op_ret parameter to @fn.
+@op_errno - op_errno parameter to @fn.
+@value - value dictionary parameter to @fn.
+ NOTE: @value pointer is stored with a dict_ref().
+call_stub_t *
+fop_getxattr_cbk_stub (call_frame_t *frame,
+ fop_getxattr_cbk_t fn,
+ int32_t op_ret,
+ int32_t op_errno,
+ dict_t *value);
+
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@op_ret - op_ret parameter to @fn.
+@op_errno - op_errno parameter to @fn.
+call_stub_t *
+fop_removexattr_cbk_stub (call_frame_t *frame,
+ fop_removexattr_cbk_t fn,
+ int32_t op_ret,
+ int32_t op_errno);
+
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@op_ret - op_ret parameter to @fn.
+@op_errno - op_errno parameter to @fn.
+@lock - lock parameter to @fn.
+ NOTE: @lock is copied to a different memory location while creating
+ stub.
+call_stub_t *
+fop_lk_cbk_stub (call_frame_t *frame,
+ fop_lk_cbk_t fn,
+ int32_t op_ret,
+ int32_t op_errno,
+ struct flock *lock);
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@op_ret - op_ret parameter to @fn.
+@op_errno - op_errno parameter to @fn.
+@lock - lock parameter to @fn.
+ NOTE: @lock is copied to a different memory location while creating
+ stub.
+call_stub_t *
+fop_gf_lk_cbk_stub (call_frame_t *frame,
+ fop_gf_lk_cbk_t fn,
+ int32_t op_ret,
+ int32_t op_errno,
+ struct flock *lock);
+
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@op_ret - op_ret parameter to @fn.
+@op_errno - op_errno parameter to @fn.
+@entries - entries parameter to @fn.
+call_stub_t *
+fop_readdir_cbk_stub (call_frame_t *frame,
+ fop_readdir_cbk_t fn,
+ int32_t op_ret,
+ int32_t op_errno,
+ gf_dirent_t *entries);
+
+
+@frame - call frame which has to be used to resume the call at call_resume().
+@fn - procedure to call during call_resume().
+@op_ret - op_ret parameter to @fn.
+@op_errno - op_errno parameter to @fn.
+@file_checksum - file_checksum parameter to @fn.
+ NOTE: file_checksum will be copied to a different memory location
+ while creating stub.
+@dir_checksum - dir_checksum parameter to @fn.
+ NOTE: file_checksum will be copied to a different memory location
+ while creating stub.
+call_stub_t *
+fop_checksum_cbk_stub (call_frame_t *frame,
+ fop_checksum_cbk_t fn,
+ int32_t op_ret,
+ int32_t op_errno,
+ uint8_t *file_checksum,
+ uint8_t *dir_checksum);
+
+resuming a call:
+---------------
+ call can be resumed using call stub through call_resume API.
+
+ void call_resume (call_stub_t *stub);
+
+ stub - call stub created during pausing a call.
+
+ NOTE: call_resume() will decrease reference count of any fd_t, dict_t and inode_t that it finds
+ in stub->args.<operation>.<fd_t-or-inode_t-or-dict_t>. so, if any fd_t, dict_t or
+ inode_t pointers are assigned at stub->args.<operation>.<fd_t-or-inode_t-or-dict_t> after
+ fop_<operation>_stub() call, they must be <fd_t-or-inode_t-or-dict_t>_ref()ed.
+
+ call_resume does not STACK_DESTROY() for any fop.
+
+ if stub->fn is NULL, call_resume does STACK_WIND() or STACK_UNWIND() using the stub->frame.
+
+ return - call resume fails only if stub is NULL. call resume fails with errno set to EINVAL.