Date: Sat, 25 May 2019 00:38:09 +0000 From: bugzilla-noreply@freebsd.org To: fs@FreeBSD.org Subject: [Bug 238112] Unable to create ZVOL Message-ID: <bug-238112-3630@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D238112 Bug ID: 238112 Summary: Unable to create ZVOL Product: Base System Version: 11.2-STABLE Hardware: Any OS: Any Status: New Severity: Affects Some People Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: eugen@freebsd.org CC: allanjude@FreeBSD.org, fs@FreeBSD.org, markj@FreeBSD.org, mav@FreeBSD.org A colleague of mine is testing his set of virtual machines under FreeBSD 11.2-STABLE using bhyve (sysutils/vm-bhyve specifically) over GELI-encrypted non-boot ZFS pool with multiple ZVOLs and faced a problem. After GELI attached the pool, kernel part of ZFS tastes its internals and writes to dmesg: ZFS WARNING: Unable to create ZVOL sata/vm/ws2019tmplENhalts/C@20190524-225700-before-1st-reboot (error=3D63). The dataset has recommended volmode=3Ddev. In sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zvol.c the function zvol_create_minor() prepends mentioned long name of dataset with prefix "zv= ol/" and calls make_dev_s() from sys/kern/kern_conf.c that is a wrapper for make_dev_sv() failing with ENAMETOOLONG (63). make_dev_sv() uses prep_devname() that returns this error if total length is more than sizeof(dev->si_name) - 1 that equals to SPECNAMELEN defined to 63= . So ZVOL name length is effectively limited to 58 octets due to "zvol/" prefix. Warning message quoted above is too cryptic for user and this limit is obsc= ure and seems to be FreeBSD-specific. Please change the code to test for ENAMETOOLONG and issue a warning describing the problem more clearly. Also, consider replacing kernel printf() with more useful logging like log(= ) so the warning would hit syslog and get to /var/log/console.log (if enabled) a= nd not dmesg buffer only. --=20 You are receiving this mail because: You are on the CC list for the bug.=
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