212,213b USB flash names not retained in Pmount, Univ Inst

Please post any bugs you have found
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BarryK
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#141 Post by BarryK »

I wonder, if you were to execute 'fdisk -l' after swapping the cards, does that force an update in /proc? ...or does fdisk only read what's in /proc?
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Jesse
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Location: Auckland, NZ

#142 Post by Jesse »

Hi Barry,

sorry "fdisk -l" does not identify the new media correctly.

Jesse
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BarryK
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#143 Post by BarryK »

Jesse, could you try the same thing with 'disktype /dev/sda'?

'disktype' does a direct read of the hardware I think, so may force an update of /proc.
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Jesse
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#144 Post by Jesse »

Hi Barry,

This idea works for when the media changes, but if you remove the media and scan it, it disapears from /proc/partitions, you'll need to rescan the device node listed from /proc/diskstats to get it back into the /proc/partitions when there is a medium present:

Code: Select all

(start with 32MB)
sh-3.00# cat /proc/partitions | grep sdc
   8    32      31296 sdc
(swap to 256MB)
sh-3.00# disktype /dev/sdc

--- /dev/sdc
Block device, size 249.3 MiB (261357568 bytes)
DOS partition map
Partition 1: 249.0 MiB (261115904 bytes, 509992 sectors from 56, bootable)
  Type 0x06 (FAT16)
  FAT16 file system (hints score 5 of 5)
    Volume size 248.8 MiB (260841472 bytes, 63682 clusters of 4 KiB)
    Volume name ""
Ext3 file system
  UUID 5E93D6C6-44E3-4732-8D25-FB1CCDB7D88E (DCE, v4)
  Volume size 249.3 MiB (261357568 bytes, 255232 blocks of 1 KiB)

sh-3.00# cat /proc/partitions | grep sdc
   8    32     255232 sdc
   8    33     254996 sdc1
(swap back to 32MB)
sh-3.00# cat /proc/partitions | grep sdc
   8    32     255232 sdc
   8    33     254996 sdc1
sh-3.00# cat /proc/partitions | grep sdc
   8    32     255232 sdc
   8    33     254996 sdc1
sh-3.00# disktype /dev/sdc

--- /dev/sdc
Block device, size 30.56 MiB (32047104 bytes)
FAT16 file system (hints score 5 of 5)
  Volume size 30.49 MiB (31967232 bytes, 15609 clusters of 2 KiB)
  Volume name ""

sh-3.00# cat /proc/partitions | grep sdc
   8    32      31296 sdc
(remove /dev/sdc media)
sh-3.00# cat /proc/partitions | grep sdc
   8    32      31296 sdc
sh-3.00# disktype /dev/sdc

--- /dev/sdc
disktype: Can't open /dev/sdc: No medium found

sh-3.00# cat /proc/partitions | grep sdc
sh-3.00# cat /proc/partitions           
major minor  #blocks  name

   7     0      67144 loop0
   7     1     524288 loop1
   7     3       8524 loop3
   7     4      61236 loop4
  22    64   78150744 hdd
  22    65    4096543 hdd1
  22    66    6136830 hdd2
  22    67    2859570 hdd3
  22    68          1 hdd4
  22    69     771088 hdd5
  22    70    8570646 hdd6
  22    71   55030626 hdd7
  22    72     682731 hdd8
   8     0  156290904 sda
   8     1   66557263 sda1
   8     2    2048287 sda2
sh-3.00#
sh-3.00# disktype /dev/sdc

--- /dev/sdc
disktype: Can't open /dev/sdc: No medium found

(insert 256MB)
sh-3.00# cat /proc/partitions | grep sdc
sh-3.00# cat /proc/diskstats | grep sdc
   8   32 sdc 159 94 2024 2480 0 0 0 0 0 1950 2480
sh-3.00# disktype /dev/sdc

--- /dev/sdc
Block device, size 249.3 MiB (261357568 bytes)
DOS partition map
Partition 1: 249.0 MiB (261115904 bytes, 509992 sectors from 56, bootable)
  Type 0x06 (FAT16)
  FAT16 file system (hints score 5 of 5)
    Volume size 248.8 MiB (260841472 bytes, 63682 clusters of 4 KiB)
    Volume name ""
Ext3 file system
  UUID 5E93D6C6-44E3-4732-8D25-FB1CCDB7D88E (DCE, v4)
  Volume size 249.3 MiB (261357568 bytes, 255232 blocks of 1 KiB)

sh-3.00# cat /proc/diskstats | grep sdc
   8   32 sdc 175 97 2176 2730 0 0 0 0 0 2130 2730
   8   33 sdc1 0 0 0 0
sh-3.00# cat /proc/diskstats | grep sdc
   8   32 sdc 175 97 2176 2730 0 0 0 0 0 2130 2730
   8   33 sdc1 0 0 0 0
sh-3.00# cat /proc/partitions | grep sdc
   8    32     255232 sdc
   8    33     254996 sdc1
sh-3.00# ./probepart-bk4 | grep sdc
/dev/sdc1|vfat|509992
(remove /dev/sdc media)
sh-3.00# ./probepart-bk4 | grep sdc
/dev/sdc1|none|509992
sh-3.00# ./probepart-bk4 | grep sdc
/dev/sdc|none|0
/dev/sdc1|none|0
sh-3.00# ./probepart-bk4 | grep sdc
/dev/sdc|none|0
/dev/sdc1|none|0
sh-3.00# cat /proc/partitions | grep sdc
sh-3.00# ./probepart-bk4 | grep sdc
/dev/sdc|none|0
/dev/sdc1|none|0
sh-3.00# cat /proc/diskstats | grep sdc
   8   32 sdc 178 106 2272 2790 0 0 0 0 0 2190 2790
   8   33 sdc1 8 64 0 0
sh-3.00# disktype /dev/sdc

--- /dev/sdc
disktype: Can't open /dev/sdc: No medium found

sh-3.00# cat /proc/diskstats | grep sdc
   8   32 sdc 178 106 2272 2790 0 0 0 0 0 2190 2790
   8   33 sdc1 8 64 0 0
sh-3.00# cat /proc/partitions | grep sdc
(insert 32MB)
sh-3.00# cat /proc/diskstats | grep sdc
   8   32 sdc 178 106 2272 2790 0 0 0 0 0 2190 2790
   8   33 sdc1 8 64 0 0
sh-3.00# cat /proc/partitions | grep sdc
sh-3.00# disktype /dev/sdc

--- /dev/sdc
Block device, size 30.56 MiB (32047104 bytes)
FAT16 file system (hints score 5 of 5)
  Volume size 30.49 MiB (31967232 bytes, 15609 clusters of 2 KiB)
  Volume name ""

sh-3.00# cat /proc/partitions | grep sdc
   8    32      31296 sdc
sh-3.00# cat /proc/diskstats | grep sdc
   8   32 sdc 188 107 2360 2950 0 0 0 0 0 2290 2950
sh-3.00# ./probepart-bk4 | grep sdc
/dev/sdc|vfat|62592
sh-3.00#
I hope all that helps!

Jesse
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