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Add port of FreeBSD 'volmode' property

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The volmode property may be set to control the visibility of ZVOL
block devices.

This allow switching ZVOL between three modes:
   full - existing fully functional behaviour (default)
   dev  - hide partitions on ZVOL block devices
   none - not exposing volumes outside ZFS

Additionally the new zvol_volmode module parameter can be used to
control the default behaviour.

This functionality can be used, for instance, on "backup" pools to
avoid cluttering /dev with unneeded zd* devices.

Original-patch-by: mav <mav@FreeBSD.org>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Ported-by: loli10K <ezomori.nozomu@gmail.com>
Signed-off-by: loli10K <ezomori.nozomu@gmail.com>

FreeBSD-commit: https://github.com/freebsd/freebsd/commit/dd28e6bb
Closes #1796 
Closes #3438 
Closes #6233
This commit is contained in:
LOLi
2017-07-12 22:05:37 +02:00
committed by Brian Behlendorf
parent e19572e4cc
commit cf8738d853
14 changed files with 634 additions and 83 deletions
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include/sys/zvol.h
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@@ -51,6 +51,7 @@ extern void zvol_create_cb(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx);
extern int zvol_set_volsize(const char *, uint64_t);
extern int zvol_set_volblocksize(const char *, uint64_t);
extern int zvol_set_snapdev(const char *, zprop_source_t, uint64_t);
extern int zvol_set_volmode(const char *, zprop_source_t, uint64_t);
extern zvol_state_t *zvol_suspend(const char *);
extern int zvol_resume(zvol_state_t *);
extern void *zvol_tag(zvol_state_t *);