sfdisk 2.20.1 --no-reread do BLKRRPART

Bertrand Jacquin
2012-02-16T20:22:58Z

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Hi,

When creating partitions on a destination that is not a block device,
sfdisk do a BLKRRPART ioctl even when --no-reread option is used, but
looking at documentation --no-reread only apply to the beginning
process.

Would it be fine to extend that to the complete process ?

Bertrand

dd if=/dev/zero of=/tmp/disk.img bs=1024 count=4032
strace -fF -s 1024 -e trace=ioctl \
sfdisk --no-reread -C2 -H32 -S63 -q -f \
/tmp/disk.img << EOF
unit: sectors

part1 : start= 63, size= 3969, Id=83
part2 : start= 4032, size= 98784, Id=83
part3 : start= 102816, size= 22176, Id=83
part4 : start= 124992, size= 0, Id=83
EOF

ioctl(0, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS, 0x7fff7b917ce0) = -1 ENOTTY (Inappropriate ioctl for device)
Warning: /tmp/disk.img is not a block device
ioctl(3, HDIO_GETGEO, 0x7fff7b917c10) = -1 ENOTTY (Inappropriate ioctl for device)
Disk /tmp/disk.img: cannot get geometry
ioctl(3, BLKGETSIZE64, 0x7fff7b917be0) = -1 ENOTTY (Inappropriate ioctl for device)
ioctl(3, BLKGETSIZE, 0x7fff7b917b18) = -1 ENOTTY (Inappropriate ioctl for device)
ioctl(3, FDGETPRM, 0x7fff7b917af0) = -1 ENOTTY (Inappropriate ioctl for device)

Disk /tmp/disk.img: 2 cylinders, 32 heads, 63 sectors/track

sfdisk: ERROR: sector 0 does not have an msdos signature
/tmp/disk.img: unrecognized partition table type
Old situation:
No partitions found
New situation:
Units = sectors of 512 bytes, counting from 0

Device Boot Start End #sectors Id System
/tmp/disk.img1 63 4031 3969 83 Linux
/tmp/disk.img2 4032 102815 98784 83 Linux
/tmp/disk.img3 102816 124991 22176 83 Linux
/tmp/disk.img4 124992 124991 0 83 Linux
Successfully wrote the new partition table

Re-reading the partition table ...
ioctl(3, BLKRRPART, 0) = -1 ENOTTY (Inappropriate ioctl for device)
BLKRRPART: Inappropriate ioctl for device

--
Beber

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