Bug 1223890

+++ This bug was initially created as a clone of Bug #1223889 +++

Description of problem:

No issue using nfs only with fuse.

For 32bits applications on 64bits systems, ino32 is mandadory but the readdirp optimisation still return 64 bits inodes when getdent syscall is triggerd.


Version-Release number of selected component (if applicable):

How reproducible:

Always

Steps to Reproduce:
1. Have a 32 bits application listing directories on a 64 bits system
2. Run it
3. Cry

Actual results:

open("/usr/global/lib/", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY|O_CLOEXEC) = 5
getdents(5, 0x9b27308, 32768)           = -1 EOVERFLOW (Value too large for defined data type)

Expected results:

open("/usr/global/lib/", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY|O_CLOEXEC) = 5
getdents(5, /* 1 entries */, 32768)     = 88

Additional info:


use use-readdirp=off when mounting the volume as a workaround but impact performaces.

--- Additional comment from Niels de Vos on 2015-05-20 22:48:16 CEST ---

Compile tested only, needs real functional test and maybe a test-case too.

This bug needs to get cloned for the mainline version and the patch needs review+merging in the master branch before it can get included in 3.5.

--- Additional comment from Cyril Peponnet on 2015-05-21 01:22:27 CEST ---

I gave a try with RPMs generated through

http://koji.fedoraproject.org/koji/taskinfo?taskID=9810286

Seems to work fine with enable-ino32 to mount options and use 32bit binary to call getdents syscall.

Thanks !

For the record to test it you can compile:

/*
 *  * List directories using getdents() because ls, find and Python libraries
 *   * use readdir() which is slower (but uses getdents() underneath.
 *    *
 *     * Compile with
 *      * ]$ gcc  getdents.c -o getdents
 *       */
#define _GNU_SOURCE
#include <dirent.h>     /* Defines DT_* constants */
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/syscall.h>

#define handle_error(msg) \
       do { perror(msg); exit(EXIT_FAILURE); } while (0)

struct linux_dirent {
   long           d_ino;
   off_t          d_off;
   unsigned short d_reclen;
   char           d_name[];
};

#define BUF_SIZE 1024*1024*5

int
main(int argc, char *argv[])
{
   int fd, nread;
   char buf[BUF_SIZE];
   struct 

with gcc -m32 getdents getdents.c


And run it like ./getdents /path/

Before the patch:

strace -e getdents ./getdents /mnt/test/
[ Process PID=15906 runs in 32 bit mode. ]
getdents(3, /* 1 entries */, 5242880)   = 16
getdents(3, 0xff8f65bf, 5242880)        = -1 EOVERFLOW (Value too large for defined data type)
getdents: Value too large for defined data type
+++ exited with 1 +++