How to get mount command to run and connect a disk all only 1 partition ?
--Glenn

# mount -v /dev/sdc /media/disk2
mount: mount(2) failed: No such file or directory

#
# strace -e open mount /dev/sdc /media/disk2
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
open("/usr/lib64/libmount.so.1", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
open("/usr/lib64/libblkid.so.1", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libselinux.so.1", O_RDONLY|O_CLOEXEC) = 3
open("/usr/lib64/libuuid.so.1", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libdl.so.2", O_RDONLY|O_CLOEXEC) = 3
open("/usr/lib64/libpcre.so.1", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libpthread.so.0", O_RDONLY|O_CLOEXEC) = 3
open("/proc/filesystems", O_RDONLY) = 3
open("/usr/lib/locale/locale-archive", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/locale.alias", O_RDONLY|O_CLOEXEC) = 3
open("/usr/lib/locale/en_US.UTF-8/LC_CTYPE", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
open("/usr/lib/locale/en_US.utf8/LC_CTYPE", O_RDONLY|O_CLOEXEC) = 3
open("/usr/lib64/gconv/gconv-modules.cache", O_RDONLY) = 3
open("/run/mount/utab", O_RDWR|O_CREAT|O_CLOEXEC, 0644) = 3
open("/dev/sdc", O_RDONLY|O_CLOEXEC) = 3
open("/sys/dev/block/8:32", O_RDONLY|O_CLOEXEC) = 4
mount: mount(2) failed: No such file or directory
+++ exited with 32 +++

# ll /media/disk2
total 0

# fdisk -l

.
.
Disk /dev/sdc: 2000.4 GB, 2000398934016 bytes, 3907029168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

# mount --help

Usage:
mount [-lhV]
mount -a [options]
mount [options] [--source] <source> | [--target] <directory>
mount [options] <source> <directory>
mount <operation> <mountpoint> [<target>]

Options:
-a, --all mount all filesystems mentioned in fstab
-c, --no-canonicalize don't canonicalize paths
-f, --fake dry run; skip the mount(2) syscall
-F, --fork fork off for each device (use with -a)
-T, --fstab <path> alternative file to /etc/fstab
-h, --help display this help text and exit
-i, --internal-only don't call the mount.<type> helpers
-l, --show-labels lists all mounts with LABELs
-n, --no-mtab don't write to /etc/mtab
-o, --options <list> comma-separated list of mount options
-O, --test-opts <list> limit the set of filesystems (use with -a)
-r, --read-only mount the filesystem read-only (same as -o ro)
-t, --types <list> limit the set of filesystem types
--source <src> explicitly specifies source (path, label, uuid)
--target <target> explicitly specifies mountpoint
-v, --verbose say what is being done
-V, --version display version information and exit
-w, --rw, --read-write mount the filesystem read-write (default)

-h, --help display this help and exit
-V, --version output version information and exit

Source:
-L, --label <label> synonym for LABEL=<label>
-U, --uuid <uuid> synonym for UUID=<uuid>
LABEL=<label> specifies device by filesystem label
UUID=<uuid> specifies device by filesystem UUID
PARTLABEL=<label> specifies device by partition label
PARTUUID=<uuid> specifies device by partition UUID
<device> specifies device by path
<directory> mountpoint for bind mounts (see --bind/rbind)
<file> regular file for loopdev setup

Operations:
-B, --bind mount a subtree somewhere else (same as -o bind)
-M, --move move a subtree to some other place
-R, --rbind mount a subtree and all submounts somewhere else
--make-shared mark a subtree as shared
--make-slave mark a subtree as slave
--make-private mark a subtree as private
--make-unbindable mark a subtree as unbindable
--make-rshared recursively mark a whole subtree as shared
--make-rslave recursively mark a whole subtree as slave
--make-rprivate recursively mark a whole subtree as private
--make-runbindable recursively mark a whole subtree as unbindable


#dmesg

2015-10-24T13:53:03.865691+11:00 test kernel: [58379.310044] usb 1-2: new high-speed USB device number 4 using ehci-pci
2015-10-24T13:53:04.001628+11:00 test kernel: [58379.446491] usb 1-2: New USB device found, idVendor=04fc, idProduct=0c25
2015-10-24T13:53:04.001661+11:00 test kernel: [58379.446504] usb 1-2: New USB device strings: Mfr=2, Product=3, SerialNumber=1
2015-10-24T13:53:04.001664+11:00 test kernel: [58379.446511] usb 1-2: Product: USB to Serial-ATA bridge
2015-10-24T13:53:04.001667+11:00 test kernel: [58379.446518] usb 1-2: Manufacturer: Sunplus Technology Inc.
2015-10-24T13:53:04.001670+11:00 test kernel: [58379.446523] usb 1-2: SerialNumber: ST32000542 5XW1ZMG4
2015-10-24T13:53:04.001673+11:00 test kernel: [58379.449478] usb-storage 1-2:1.0: USB Mass Storage device detected
2015-10-24T13:53:04.005699+11:00 test kernel: [58379.450122] scsi host5: usb-storage 1-2:1.0
2015-10-24T13:53:04.009508+11:00 test mtp-probe: checking bus 1, device 4: "/sys/devices/pci0000:00/0000:00:12.2/usb1/1-2"
2015-10-24T13:53:04.010717+11:00 test mtp-probe: bus: 1, device: 4 was not an MTP device
2015-10-24T13:53:05.009615+11:00 test kernel: [58380.455696] scsi 5:0:0:0: Direct-Access ST320005 42AS PQ: 0 ANSI: 2
2015-10-24T13:53:05.009644+11:00 test kernel: [58380.456130] sd 5:0:0:0: Attached scsi generic sg3 type 0
2015-10-24T13:53:05.009646+11:00 test kernel: [58380.457884] sd 5:0:0:0: [sdc] 3907029168 512-byte logical blocks: (2.00 TB/1.81 TiB)
2015-10-24T13:53:05.013585+11:00 test kernel: [58380.460454] sd 5:0:0:0: [sdc] Write Protect is off
2015-10-24T13:53:05.013619+11:00 test kernel: [58380.460471] sd 5:0:0:0: [sdc] Mode Sense: 38 00 00 00
2015-10-24T13:53:05.017676+11:00 test kernel: [58380.464150] sd 5:0:0:0: [sdc] No Caching mode page found
2015-10-24T13:53:05.017698+11:00 test kernel: [58380.464164] sd 5:0:0:0: [sdc] Assuming drive cache: write through
2015-10-24T13:53:05.049635+11:00 test kernel: [58380.494889] sd 5:0:0:0: [sdc] Attached SCSI disk

Did you make a filesystem on sdc?

Yes -at the time it was /dev/sdb

Some details:
--Glenn

# fsck.reiser4 --check /dev/sdb
*******************************************************************
This is an EXPERIMENTAL version of fsck.reiser4. Read README first.
*******************************************************************

Fscking the /dev/sdb block device.


Will check the consistency of the Reiser4 SuperBlock.


Will check the consistency of the Reiser4 FileSystem.


Continue?


(Yes/No): yes
***** fsck.reiser4 started at Fri Feb 27 02:58:06 2015
Reiser4 fs was detected on /dev/sdb.


Master super block (16):
magic: ReIsEr4
blksize: 4096
format: 0x0 (format40)
uuid: 3006ced1-7490-4ea8-a9b8-d82143c6bede
label: <none>

Format super block (17):
plugin: format40
description: Disk-format plugin.
version: 0
magic: ReIsEr40FoRmAt
mkfs id: 0x1ddaf754
flushes: 0
blocks: 488378640
free blocks: 217146980
root block: 37017218
tail policy: 0x2 (smart)
next oid: 0xedade
file count: 188313
tree height: 6
key policy: LARGE


CHECKING THE STORAGE TREE


Read nodes 197008413


Nodes left in the tree 197008413
Leaves of them 194764277, Twigs of them 2217790
Time interval: Fri Feb 27 03:00:05 2015 - Fri Feb 27 11:07:45 2015

CHECKING EXTENT REGIONS.


Read twigs 2217790


Time interval: Fri Feb 27 11:07:45 2015 - Fri Feb 27 13:18:06 2015

CHECKING THE SEMANTIC TREE


FSCK: semantic.c: 573: repair_semantic_dir_open: Failed to recognize the
plugin for the directory [29:0:2a].

FSCK: semantic.c: 651: repair_semantic_root_prepare: No root directory
opened.
Time interval: Fri Feb 27 13:18:06 2015 - Fri Feb 27 13:18:06 2015


FSCK: repair.c: 550: repair_sem_fini: On-disk used block bitmap and really
used block bitmap differ.

***** fsck.reiser4 finished at Fri Feb 27 13:18:07 2015
Closing fs...done

2 fatal corruptions were detected in FileSystem. Run with --build-fs
option to fix them.


-prevoius try
http://www.spinics.net/lists/reiserf.../msg04903.html

The problem clearly occurs in the mount system call, so why do you strace open()?

Edit: man 2 mount says "ENOENT A pathname was empty or had a nonexistent component", which I have a hard time to understand.

# strace -e open mount /dev/sdc /media/disk2
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
open("/usr/lib64/libmount.so.1", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
open("/usr/lib64/libblkid.so.1", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libselinux.so.1", O_RDONLY|O_CLOEXEC) = 3
open("/usr/lib64/libuuid.so.1", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libdl.so.2", O_RDONLY|O_CLOEXEC) = 3
open("/usr/lib64/libpcre.so.1", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libpthread.so.0", O_RDONLY|O_CLOEXEC) = 3
open("/proc/filesystems", O_RDONLY) = 3
open("/usr/lib/locale/locale-archive", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/locale.alias", O_RDONLY|O_CLOEXEC) = 3
open("/usr/lib/locale/en_US.UTF-8/LC_CTYPE", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
open("/usr/lib/locale/en_US.utf8/LC_CTYPE", O_RDONLY|O_CLOEXEC) = 3
open("/usr/lib64/gconv/gconv-modules.cache", O_RDONLY) = 3
open("/run/mount/utab", O_RDWR|O_CREAT|O_CLOEXEC, 0644) = 3
open("/dev/sdc", O_RDONLY|O_CLOEXEC) = 3
open("/sys/dev/block/8:32", O_RDONLY|O_CLOEXEC) = 4
mount: mount(2) failed: No such file or directory
+++ exited with 32 +++

Re:
The problem clearly occurs in the mount system call
man 2 mount says "ENOENT A pathname was empty or had a nonexistent component"

#cat /proc/filesystems | awk '{print $NF}' | sed '/^$/d' | grep -i reiser
reiserfs
reiser4

I did:
# mount -t reiser4 /dev/sdc /media/disk2
mount: mount(2) failed: No such file or directory

# ll /media/disk2
total 0

I am curious what you get with
The fact fhat reiserfs is in your /proc/filesystems doesn't mean it's on that disk. Have you fsck'd the disk recently?

Q:Have you fsck'd the disk recently?
A: [Feb 2015] See threads
http://www.spinics.net/lists/reiserf.../msg04665.html
http://www.spinics.net/lists/reiserf.../msg04900.html
Data and files on disk, just trying to access it but volume wont mount for some reason.
--Glenn

Rerun that strace with "-e file". The ENOENT error could have come from a lot of syscalls other than open(). (My bet would be on stat() or lstat().)