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Use udev to create /dev/zvol/[dataset_name] links

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This commit allows zvols with names longer than 32 characters, which
fixes issue on https://github.com/behlendorf/zfs/issues/#issue/102.

Changes include:
- use /dev/zd* device names for zvol, where * is the device minor
  (include/sys/fs/zfs.h, module/zfs/zvol.c).
- add BLKZNAME ioctl to get dataset name from userland
  (include/sys/fs/zfs.h, module/zfs/zvol.c, cmd/zvol_id).
- add udev rule to create /dev/zvol/[dataset_name] and the legacy
  /dev/[dataset_name] symlink. For partitions on zvol, it will create
  /dev/zvol/[dataset_name]-part* (etc/udev/rules.d/60-zvol.rules,
  cmd/zvol_id).

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
This commit is contained in:
Fajar A. Nugraha
2011-02-22 17:58:44 +07:00
committed by Brian Behlendorf
parent 61da501f9d
commit 4c0d8e50b9
10 changed files with 761 additions and 9 deletions
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etc/udev/rules.d/60-zvol.rules
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# Peristent links for zvol
#
# persistent disk links: /dev/zvol/dataset_name
# also creates compatibilty symlink of /dev/dataset_name
KERNEL=="zd*" SUBSYSTEM=="block" ACTION=="add" PROGRAM="/usr/bin/zvol_id $tempnode" SYMLINK+="zvol/%c %c"