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ltfs file backend does not work with a format and type different from LTO5

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#535 12 comentarios 0 reacciones 1 asignado Ver en GitHub

@madjesc ya está trabajando en esto.

Desde el 31/7/2025.

Evaluación

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Descripción

enhancement

Describe the bug
Even tho you can change the tape type and density using cart_type and density_code, if you use any other format besides LTO5 it will not format.

To Reproduce

  • mkdir tape
  • mkltfs -e file -d tape
  • cd tape
  • Change the backend configuration to use any density and type different from LTO5, e.g.
<?xml version="1.0" encoding="UTF-8"?>
<filedebug_cartridge_config>
    <dummy_io>false</dummy_io>
    <emulate_readonly>false</emulate_readonly>
    <capacity_mb>204800</capacity_mb>
    <cart_type>L6</cart_type>
    <density_code>5A</density_code>
    <delay_mode>None</delay_mode>
    <wraps>40</wraps>
    <change_direction_us>2000000</change_direction_us>
    <change_track_us>10000</change_track_us>
    <threading_sec>0</threading_sec>
</filedebug_cartridge_config>
  • mkltfs -f -e file -d tape
LTFS15000I Starting mkltfs, LTFS version 2.5.0.0 (Prelim), log level 3.
LTFS15041I Launched by "mkltfs -f -t -e file -d tape0".
LTFS15042I This binary is built for Linux (x86_64).
LTFS15043I GCC version is 11.4.1 20231218 (Red Hat 11.4.1-3).
LTFS17087I Kernel version: Linux version 5.14.0-427.13.1.el9_4.x86_64 ([email protected]) (gcc (GCC) 11.4.1 20231218 (Red Hat 11.4.1-3), GNU ld version 2.35.2-43.el9) #1 SMP PREEMPT_DYNAMIC Wed Apr 10 10:29:16 EDT 2024 i386.
LTFS17089I Distribution: NAME="Red Hat Enterprise Linux".
LTFS17089I Distribution: Red Hat Enterprise Linux release 9.4 (Plow).
LTFS17089I Distribution: Red Hat Enterprise Linux release 9.4 (Plow).
LTFS15025D Validating command line options.
LTFS15037D Command line options are valid.
LTFS15003I Formatting device 'tape0'.
LTFS15004I LTFS volume blocksize: 524288.
LTFS15005I Index partition placement policy: None.

LTFS11337I Update index-dirty flag (1) - NO_BARCODE (0x0x55738f543c50).
LTFS15006D Opening the device.
LTFS17085I Plugin: Loading "file" tape backend.
LTFS30000I Opening a device through generic file driver (tape0).
LTFS30003I Opening a directory through generic file driver (tape0).
LTFS12023D Reserving device.
LTFS12028D Unlocking medium.
LTFS30061E Cannot unlock medium: unit not ready.
LTFS17160I Maximum device block size is 4194304.
LTFS11330I Loading cartridge.
LTFS30048I Loading a directory through generic file driver (tape0).
LTFS30086I Cartridge is unsupported (LTO5, 0x68).
LTFS11331E Failed to load the cartridge (ltfs_load_tape).
LTFS17157I Changing the drive setting to write-anywhere mode.
LTFS15007D Device opened.
LTFS15049I Checking the medium (load).
LTFS30198D Backend readpos: (0, 0) FM = 0.
LTFS15010I Creating data partition b on SCSI partition 1.
LTFS15011I Creating index partition a on SCSI partition 0.
LTFS17254E This cartridge cannot be reformatted in the drive (0x68, 5).
LTFS15012E Failed to format the medium.
LTFS12028D Unlocking medium.
LTFS12025D Releasing device.
LTFS15023I Formatting failed.

Expected behavior
It should format to any other format available

Desktop (please complete the following information):

  • OS: RHEL 9.4

Additional context
The reason is becase it's hardcoded in filedebug_tc.c:411

state->product_id = "ULTRIUM-TD5";

But also it tries to get the drive_type from the serial of the tape wich is weird.

for (i = 0; i < (int)strlen(state->serial_number); i++) {
	if (state->serial_number[i] == '.') {
		state->serial_number[i] = '\0';
		state->product_id = &(state->serial_number[i+1]);
		break;
	}
}

In this part gets the first compatible drive from the ibm_supported_drives variable, wich is an ULT3580-TD5 that is not compatible with any other tape.

while(*d_cur) {
	if((! strncmp(IBM_VENDOR_ID, (*d_cur)->vendor_id, strlen((*d_cur)->vendor_id)) ) &&
	   (! strncmp(state->product_id, (*d_cur)->product_id, strlen((*d_cur)->product_id)) ) ) {
		state->drive_type = (*d_cur)->drive_type;
		break;
	}
	d_cur++;
}

I'm currently working in a new option for the xml file to specify the drive type

Lenguaje dominante
C
Estrellas
356
Forks
111
Merge medio
1 h 52 min
PR fusionados (30 d)
1

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