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zfsd should be able to online an L2ARC that disappears and returns

Browse source 
Previously, this didn't work because L2ARC devices' labels don't contain
pool GUIDs.  Modify zfsd so that the pool GUID won't be required:

lib/libdevdctl/guid.h
	Change INVALID_GUID from a uint64_t constant to a function that
	returns an invalid Guid object.  Remove the void constructor.
	Nothing uses it, and it violates RAII.

cddl/usr.sbin/zfsd/case_file.h
cddl/usr.sbin/zfsd/case_file.cc
	Allow CaseFile::Find to match a CaseFile based on Vdev GUID alone.
	In CaseFile::ReEvaluate, attempt to online devices even if the newly
	arrived device has no pool GUID.

cddl/usr.sbin/zfsd/vdev_iterator.cc
	Iterate through a pool's cache devices as well as its regular
	devices.

Reported by:	avg
Reviewed by:	avg
MFC after:	3 weeks
Sponsored by:	Spectra Logic Corp
Differential Revision:	https://reviews.freebsd.org/D12791
This commit is contained in:
Alan Somers 2017-10-26 15:28:18 +00:00
parent 79b67c8d4a
commit 12a88a3d63
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=325011
4 changed files with 24 additions and 10 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
cddl/usr.sbin/zfsd/case_file.cc
View file

@ -102,7 +102,8 @@ CaseFile::Find(Guid poolGUID, Guid vdevGUID)
for (CaseFileList::iterator curCase = s_activeCases.begin();
curCase != s_activeCases.end(); curCase++) {
if ((*curCase)->PoolGUID() != poolGUID
if (((*curCase)->PoolGUID() != poolGUID
&& Guid::InvalidGuid() != poolGUID)
|| (*curCase)->VdevGUID() != vdevGUID)
continue;
@ -268,7 +269,8 @@ CaseFile::ReEvaluate(const string &devPath, const string &physPath, Vdev *vdev)
}
if (vdev != NULL
&& vdev->PoolGUID() == m_poolGUID
&& ( vdev->PoolGUID() == m_poolGUID
|| vdev->PoolGUID() == Guid::InvalidGuid())
&& vdev->GUID() == m_vdevGUID) {
zpool_vdev_online(pool, vdev->GUIDString().c_str(),

2
cddl/usr.sbin/zfsd/case_file.h
View file

@ -89,6 +89,8 @@ class CaseFile
* \brief Find a CaseFile object by a vdev's pool/vdev GUID tuple.
*
* \param poolGUID Pool GUID for the vdev of the CaseFile to find.
* If InvalidGuid, then only match the vdev GUID
* instead of both pool and vdev GUIDs.
* \param vdevGUID Vdev GUID for the vdev of the CaseFile to find.
*
* \return If found, a pointer to a valid CaseFile object.

9
cddl/usr.sbin/zfsd/vdev_iterator.cc
View file

@ -76,7 +76,9 @@ void
VdevIterator::Reset()
{
nvlist_t *rootVdev;
nvlist **cache_child;
int result;
uint_t cache_children;
result = nvlist_lookup_nvlist(m_poolConfig,
ZPOOL_CONFIG_VDEV_TREE,
@ -85,6 +87,13 @@ VdevIterator::Reset()
throw ZfsdException(m_poolConfig, "Unable to extract "
"ZPOOL_CONFIG_VDEV_TREE from pool.");
m_vdevQueue.assign(1, rootVdev);
result = nvlist_lookup_nvlist_array(rootVdev,
ZPOOL_CONFIG_L2CACHE,
&cache_child,
&cache_children);
if (result == 0)
for (uint_t c = 0; c < cache_children; c++)
m_vdevQueue.push_back(cache_child[c]);
}
nvlist_t *

17
lib/libdevdctl/guid.h
View file

@ -62,9 +62,9 @@ class Guid
{
public:
/* Constructors */
Guid();
Guid(uint64_t guid);
Guid(const std::string &guid);
static Guid InvalidGuid();
/* Assignment */
Guid& operator=(const Guid& rhs);
@ -80,25 +80,26 @@ class Guid
operator uint64_t() const;
operator bool() const;
static const uint64_t INVALID_GUID = 0;
protected:
static const uint64_t INVALID_GUID = 0;
/* The integer value of the GUID. */
uint64_t m_GUID;
};
//- Guid Inline Public Methods ------------------------------------------------
inline
Guid::Guid()
: m_GUID(INVALID_GUID)
{
}
inline
Guid::Guid(uint64_t guid)
: m_GUID(guid)
{
}
inline Guid
Guid::InvalidGuid()
{
return (Guid(INVALID_GUID));
}
inline Guid&
Guid::operator=(const Guid &rhs)
{