LittleFS: Error Resizing the External QSPI NOR Flash in nRF52840dk

[DineshDK03]

Describe the bug
I tried running the USB mass storage sample in that I can't able to use the whole 64MiBi of external qspi_nor flash in nRF52840dk for littleFS partition. I tried changing the reg value in the partition table as <0x0 0x4000000> inside the overlay file Also I tried changing the label as label = "storage_lfs" and replaced the label name accordingly in the source code as well.

To Reproduce
Steps to reproduce the behavior:

1. Edit nrf52840dk_nrf52840.overlay file's Line 16 into this reg = <0x00000000 0x4000000>; to get 64Mb size
2. Follow this link for build, flash, and mount as LittleFS
3. During the process of LFS mounting in the Host system, make sure changed the block_count=16384

Expected behavior
It is supposed to access 64Mb size and able to use basic Linux file system operations like mkdir, cp, mv, etc.,

Logs and Console Outputs
minicom terminal output is as follows,

*** Booting Zephyr OS build zephyr-v2.4.0-2674-g4ca7942411f7  ***
Area 4 at 0x0 on MX25R64 for 67108864 bytes
[00:00:00.368,164] <inf> littlefs: LittleFS version 2.2, disk version 2.0
[00:00:00.370,300] <inf> littlefs: FS at MX25R64:0x0 is 16384 0x1000-byte blocks with 512 cycle
[00:00:00.370,300] <inf> littlefs: sizes: rd 16 ; pr 16 ; ca 64 ; la 32
[00:00:00.370,697] <inf> littlefs: /lfs mounted
Mount /lfs: 0
/lfs: bsize = 16 ; frsize = 4096 ; blocks = 16384 ; bfree = 16382
/lfs opendir: 0
End of files
[00:00:00.431,610] <inf> main: The device is put in USB mass storage mode.

but while running system log to determine device name it shows only 131kB only available as follows,

Jan 06 11:49:56 arch kernel: scsi 9:0:0:0: Direct-Access    ZEPHYR  ZEPHYR USB DISK 0.01 PQ: 0 ANSI: 0 CCS 
Jan 06 11:49:56 arch kernel: sd 9:0:0:0: [sdg] 256 512-byte logical blocks: (131 kB/128 KiB) 
Jan 06 11:49:56 arch kernel: sd 9:0:0:0: [sdg] Write Protect is off 
Jan 06 11:49:56 arch kernel: sd 9:0:0:0: [sdg] Mode Sense: 03 00 00 00 
Jan 06 11:49:56 arch kernel: sd 9:0:0:0: [sdg] No Caching mode page found 
Jan 06 11:49:56 arch kernel: sd 9:0:0:0: [sdg] Assuming drive cache: write through 
Jan 06 11:49:57 arch kernel: sd 9:0:0:0: [sdg] Attached SCSI removable disk

Also during mounting the littleFS partition with the host system by following this instruction in this link. I changed the block_count =16384 mounting process done successfully but most linux commands like mkdir, cp commands are not working(mkdir: cannot create directory 'new': Invalid argument). But at the same time during the littlefs mounting process changing the block_count = 32 (example's default value) and doing so makes linux commands work properly.

Environment (please complete the following information):

• OS: Linux (Arch Linux to be specific)

[jfischer-no]

You need to adjust DISK_VOLUME_SIZE accordingly. The default value is 0x20000 = 256 512-byte logical blocks.

[DineshDK03]

Thank you @jfischer-no, it worked