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vdev_iokit_util.cpp
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/*
* Apple IOKit (c++)
*/
#include <IOKit/IOLib.h>
#include <IOKit/IOTypes.h>
#include <IOKit/IOBSD.h>
#include <IOKit/IOKitKeys.h>
#include <IOKit/IOMemoryDescriptor.h>
/* #include <IOKit/IOBufferMemoryDescriptor.h> */
#include <IOKit/IOWorkLoop.h>
#include <IOKit/IOPlatformExpert.h>
#include <sys/vdev_impl.h>
#include <sys/vdev_iokit.h>
#include <sys/vdev_iokit_context.h>
/*
* XXX To do -
* Determine best value
* First used value was 8
* #define VDEV_IOKIT_PREALLOCATE_CONTEXTS 16
*/
/*
* IOKit C++ functions
*/
extern void vdev_iokit_log(const char *logString)
{
IOLog("ZFS: vdev: %s\n", logString);
}
extern void vdev_iokit_log_str(const char *logString1, const char *logString2)
{
IOLog("ZFS: vdev: %s {%s}\n", logString1, logString2);
}
extern void vdev_iokit_log_ptr(const char *logString, const void *logPtr)
{
IOLog("ZFS: vdev: %s [%p]\n", logString, logPtr);
}
extern void vdev_iokit_log_num(const char *logString, const uint64_t logNum)
{
IOLog("ZFS: vdev: %s (%llu)\n", logString, logNum);
}
static inline void vdev_iokit_context_free(vdev_iokit_context_t *io_context);
static inline vdev_iokit_context_t *vdev_iokit_context_alloc(zio_t *zio)
{
vdev_iokit_context_t *io_context = 0;
IOMemoryDescriptor *newBuffer = 0;
if (!zio || !zio->io_data || zio->io_size == 0)
return (0);
/* KM_PUSHPAGE for IO context */
io_context = (vdev_iokit_context_t *)kmem_alloc(
sizeof (vdev_iokit_context_t), KM_PUSHPAGE);
if (!io_context)
return (0);
newBuffer = IOBufferMemoryDescriptor::withAddress(
zio->io_data, zio->io_size,
(zio->io_type == ZIO_TYPE_WRITE ?
kIODirectionOut : kIODirectionIn));
if (!newBuffer)
goto error;
io_context->buffer = newBuffer;
newBuffer = 0;
io_context->completion.target = io_context;
io_context->completion.parameter = zio;
io_context->completion.action = (IOStorageCompletionAction)
&vdev_iokit_io_intr;
return (io_context);
error:
vdev_iokit_context_free(io_context);
io_context = 0;
return (0);
}
static inline void vdev_iokit_context_free(vdev_iokit_context_t *io_context)
{
if (!io_context) {
return;
}
if (io_context->buffer) {
io_context->buffer->release();
io_context->buffer = 0;
}
io_context->completion.target = 0;
io_context->completion.parameter = 0;
io_context->completion.action = 0;
kmem_free(io_context, sizeof (vdev_iokit_context_t));
io_context = 0;
}
#if 0 /* Disabled */
extern inline void *vdev_iokit_get_context(vdev_iokit_t *dvd, zio_t *zio)
{
bool blocking = false;
IOCommandPool * command_pool = 0;
if (!zio || !dvd)
return (0);
if (zio->io_type == ZIO_TYPE_WRITE) {
command_pool = (OSDynamicCast(IOCommandPool,
(OSObject *)dvd->out_command_pool));
} else {
command_pool = (OSDynamicCast(IOCommandPool,
(OSObject *)dvd->in_command_pool));
}
if (!command_pool) {
vdev_iokit_log("vdev_iokit_get_context: invalid command_pools");
return (0);
}
/*
* Negate the value of failfast in
* zio->io_flags
*
* For fail-fast, get a context
* without blocking - can return 0.
* Otherwise block and guarantee a
* returned IOCommand.
*/
blocking = ~(zio->io_flags & ZIO_FLAG_FAILFAST);
return (void *)(command_pool->getCommand(blocking));
}
extern inline void vdev_iokit_return_context(zio_t *zio, void *io_context)
{
vdev_iokit_t *dvd = 0;
IOCommandPool *command_pool = 0;
if (!zio || !zio->io_vd || !zio->io_vd->vdev_tsd)
return;
dvd = static_cast <vdev_iokit_t *> (zio->io_vd->vdev_tsd);
if (!dvd)
return;
if (zio->io_type == ZIO_TYPE_WRITE) {
command_pool = (OSDynamicCast(IOCommandPool,
(OSObject *)dvd->out_command_pool));
} else {
command_pool = (OSDynamicCast(IOCommandPool,
(OSObject *)dvd->in_command_pool));
}
if (!command_pool) {
return;
}
command_pool->returnCommand((IOCommand *)io_context);
}
extern int vdev_iokit_context_pool_alloc(vdev_iokit_t *dvd)
{
OSSet * new_set = 0;
IOWorkLoop * work_loop = 0;
IOCommandPool * new_in_pool = 0;
IOCommandPool * new_out_pool = 0;
net_lundman_vdev_io_context * new_context = 0;
int preallocate = VDEV_IOKIT_PREALLOCATE_CONTEXTS;
int error = EINVAL;
/* Only allocate if dvd avail and command pools are not */
if (!dvd || (dvd->in_command_pool && dvd->out_command_pool)) {
return (EINVAL);
}
/* Allocate command set if needed */
if (dvd->command_set) {
new_set = (OSSet *)dvd->command_set;
} else {
new_set = OSSet::withCapacity(preallocate);
if (!new_set) {
error = ENOMEM;
goto error;
}
}
if (!dvd->in_command_pool) {
/* Allocate read work loop */
work_loop = IOWorkLoop::workLoopWithOptions(
IOWorkLoop::kPreciousStack);
if (!work_loop) {
error = ENOMEM;
goto error;
}
/* Allocate read command pool */
new_in_pool = IOCommandPool::withWorkLoop(work_loop);
if (!new_in_pool) {
error = ENOMEM;
work_loop->release();
work_loop = 0;
goto error;
}
/* IOCommandPool holds a reference to work_loop now */
work_loop = 0;
/* Pre-allocate contexts for reads */
for (int i = 0; i < preallocate; i++) {
new_context = (net_lundman_vdev_io_context *)
net_lundman_vdev_io_context::withDirection(
kIODirectionIn);
if (!new_context) {
error = ENOMEM;
goto error;
}
new_set->setObject(new_context);
new_in_pool->returnCommand(new_context);
new_context->release();
new_context = 0;
}
}
if (!dvd->out_command_pool) {
/* Allocate write work loop */
work_loop = IOWorkLoop::workLoopWithOptions(
IOWorkLoop::kPreciousStack);
if (!work_loop) {
error = ENOMEM;
goto error;
}
new_out_pool = IOCommandPool::withWorkLoop(work_loop);
if (!new_out_pool) {
error = ENOMEM;
work_loop->release();
work_loop = 0;
new_in_pool->release();
new_in_pool = 0;
goto error;
}
/* IOCommandPool holds a reference to work_loop now */
work_loop = 0;
/* Pre-allocate contexts for writes */
for (int i = 0; i < preallocate; i++) {
new_context = (net_lundman_vdev_io_context *)
net_lundman_vdev_io_context::withDirection(
kIODirectionOut);
if (!new_context) {
error = ENOMEM;
goto error;
}
new_set->setObject(new_context);
new_out_pool->returnCommand(new_context);
new_context->release();
new_context = 0;
}
}
dvd->command_set = new_set;
new_set = 0;
if (new_in_pool) {
dvd->in_command_pool = new_in_pool;
new_in_pool = 0;
}
if (new_out_pool) {
dvd->out_command_pool = new_out_pool;
new_out_pool = 0;
}
return (0);
error:
vdev_iokit_context_pool_free(dvd);
return (error);
}
extern int vdev_iokit_context_pool_free(vdev_iokit_t *dvd)
{
IOCommandPool * command_pool = 0;
OSSet * command_set = 0;
if (!dvd)
return (EINVAL);
if (dvd->in_command_pool) {
command_pool = (IOCommandPool *)dvd->in_command_pool;
dvd->in_command_pool = 0;
command_pool->release();
command_pool = 0;
}
if (dvd->out_command_pool) {
command_pool = (IOCommandPool *)dvd->out_command_pool;
dvd->out_command_pool = 0;
command_pool->release();
command_pool = 0;
}
if (dvd->command_set) {
command_set = (OSSet *)dvd->command_set;
dvd->command_set = 0;
/* This will release all of the contained IOCommands */
command_set->flushCollection();
command_set->release();
command_set = 0;
}
return (0);
}
#endif /* Disabled */
extern void * vdev_iokit_get_service()
{
IORegistryIterator * registryIterator = 0;
OSIterator * newIterator = 0;
IORegistryEntry * currentEntry = 0;
OSDictionary * matchDict = 0;
OSOrderedSet * allServices = 0;
OSString * entryName = 0;
IOService * zfs_hl = 0;
currentEntry = IORegistryEntry::fromPath(
"IOService:/IOResources/net_lundman_zfs_zvol",
0, 0, 0, 0);
if (currentEntry) {
zfs_hl = OSDynamicCast(IOService, currentEntry);
currentEntry->release();
currentEntry = 0;
if (zfs_hl) {
return ((void *)zfs_hl);
}
}
/* If not matched, go to plan B */
matchDict = IOService::resourceMatching("net_lundman_zfs_zvol", 0);
if (matchDict) {
newIterator = IOService::getMatchingServices(matchDict);
matchDict->release();
matchDict = 0;
if (newIterator) {
registryIterator = OSDynamicCast(IORegistryIterator,
newIterator);
if (registryIterator) {
zfs_hl = OSDynamicCast(IOService,
registryIterator->getCurrentEntry());
if (zfs_hl)
zfs_hl->retain();
registryIterator->release();
registryIterator = 0;
}
}
}
if (zfs_hl) {
zfs_hl->release();
return ((void *)zfs_hl);
}
/* If not matched, go to plan C */
registryIterator = IORegistryIterator::iterateOver(
gIOServicePlane, kIORegistryIterateRecursively);
if (registryIterator) {
do {
if (allServices)
allServices->release();
allServices = registryIterator->iterateAll();
} while (! registryIterator->isValid());
registryIterator->release();
registryIterator = 0;
}
if (!allServices) {
return (0);
}
while ((currentEntry = OSDynamicCast(IORegistryEntry,
allServices->getFirstObject()))) {
if (currentEntry) {
entryName = OSDynamicCast(OSString,
currentEntry->copyName());
if (entryName) {
if (entryName->isEqualTo(
"net_lundman_zfs_zvol")) {
zfs_hl = OSDynamicCast(
IOService,
currentEntry);
zfs_hl->retain();
}
entryName->release();
entryName = 0;
}
// Remove from the set
allServices->removeObject(currentEntry);
currentEntry = 0;
if (zfs_hl) {
/* Found service */
break;
}
}
}
allServices->release();
allServices = 0;
if (zfs_hl) {
zfs_hl->release();
}
return ((void *)zfs_hl);
} /* vdev_iokit_get_service */
/*
* We want to match on all disks or volumes that
* do not contain a partition map / raid / LVM
* - Caller must release the returned object
*/
extern OSSet * vdev_iokit_get_disks()
{
const OSBoolean * matchBool = OSBoolean::withBoolean(true);
OSSet * allMatches = 0;
IORegistryIterator * registryIterator = 0;
IORegistryEntry * currentEntry = 0;
OSOrderedSet * allEntries = 0;
boolean_t result = false;
registryIterator = IORegistryIterator::iterateOver(gIOServicePlane,
kIORegistryIterateRecursively);
if (!registryIterator) {
registryIterator = 0;
return (0);
}
/*
* The registry iterator may be invalid by the time
* we've copied all the records. If so, try again
*/
do {
/* Reset allEntries if needed */
if (allEntries) {
allEntries->release();
allEntries = 0;
}
/* Grab all records */
allEntries = registryIterator->iterateAll();
} while (! registryIterator->isValid());
if (registryIterator) {
/* clean up */
registryIterator->release();
registryIterator = 0;
}
if (allEntries && allEntries->getCount() > 0) {
/*
* Pre-allocate a few records
* Most systems will have at least
* 2 or 3 'leaf' IOMedia objects-
* and the set will allocate more
*/
allMatches = OSSet::withCapacity(3);
}
/* Loop through all the items in allEntries */
while (allEntries->getCount() > 0) {
/*
* Grab the first object in the set.
* (could just as well be the last object)
*/
currentEntry = OSDynamicCast(IORegistryEntry,
allEntries->getFirstObject());
if (!currentEntry) {
/* clean up */
allEntries->flushCollection();
allEntries->release();
allEntries = 0;
break;
}
/*
* XXX - TO DO
*
* Also filter out CoreStorage PVs but not LVMs?
*/
/* Check 'Leaf' property */
matchBool = OSDynamicCast(OSBoolean,
currentEntry->getProperty(kIOMediaLeafKey));
result = (matchBool && matchBool->getValue() == true);
matchBool = 0;
if (result) {
allMatches->setObject(currentEntry);
}
/* Remove current item from ordered set */
allEntries->removeObject(currentEntry);
currentEntry = 0;
}
if (allEntries) {
allEntries->flushCollection();
allEntries->release();
}
allEntries = 0;
return (allMatches);
}
/* Returned object will have a reference count and should be released */
int
vdev_iokit_find_by_path(vdev_iokit_t *dvd, char *diskPath, uint64_t guid = 0)
{
OSSet * allDisks = 0;
OSObject * currentEntry = 0;
IOMedia * currentDisk = 0;
IOMedia * matchedDisk = 0;
OSObject * bsdnameosobj = 0;
OSString * bsdnameosstr = 0;
char *diskName = 0;
nvlist_t *config = 0;
uint64_t min_size = SPA_MINDEVSIZE; /* 64 Mb */
uint64_t current_guid = 0;
if (!dvd || !diskPath) {
return (EINVAL);
}
allDisks = vdev_iokit_get_disks();
if (!allDisks) {
return (EINVAL);
}
/*
* XXX - TO DO
* We may need to rework libzpool
* to resolve symlinks to /dev/diskNsN
*/
if (strncmp(diskPath, "/dev/", 5) == 0)
diskName = diskPath + 5;
else
diskName = diskPath;
#if 0
diskName = strrchr(diskPath, '/');
if (diskName) {
/* /dev/disk0s2 -> /disk0s2 */
/* Start after the last path divider */
diskName++;
/* /disk0s2 -> disk0s2 */
} else {
/*
* XXX To do - check that diskName
* is in the form diskNsN
*/
diskName = diskPath;
}
#endif
while (allDisks->getCount() > 0) {
/* Get next object */
currentEntry = allDisks->getAnyObject();
if (!currentEntry) {
break;
}
currentDisk = OSDynamicCast(IOMedia, currentEntry);
/* Couldn't cast? */
if (!currentDisk) {
/* Pop from list */
allDisks->removeObject(currentEntry);
currentEntry = 0;
continue;
}
if (currentDisk->getSize() < min_size) {
/* Pop from list */
allDisks->removeObject(currentEntry);
currentEntry = 0;
currentDisk = 0;
continue;
}
bsdnameosobj = currentDisk->getProperty(kIOBSDNameKey,
gIOServicePlane, kIORegistryIterateRecursively);
if (bsdnameosobj) {
bsdnameosstr = OSDynamicCast(OSString, bsdnameosobj);
bsdnameosobj = 0;
}
if (!bsdnameosstr) {
/* Pop from list */
allDisks->removeObject(currentEntry);
currentEntry = 0;
currentDisk = 0;
continue;
}
/* Check if the name matches */
if (bsdnameosstr->isEqualTo(diskName)) {
/* Success - save match */
matchedDisk = currentDisk;
matchedDisk->retain();
}
/* Pop from list */
allDisks->removeObject(currentEntry);
currentEntry = 0;
currentDisk = 0;
/* Find by path breaks on the first match */
if (matchedDisk) {
break;
}
}
/* Check GUID */
if (guid > 0 && matchedDisk) {
/* Temporarily assign currentDisk to the dvd */
dvd->vd_iokit_hl = (void *)matchedDisk;
/* Try to read a config label from this disk */
if (vdev_iokit_read_label(dvd, &config) != 0 ||
nvlist_lookup_uint64(config,
ZPOOL_CONFIG_GUID, ¤t_guid) != 0 ||
current_guid != guid) {
/* Clear matchedDisk */
matchedDisk->release();
matchedDisk = 0;
}
/* Clear the vd_iokit_hl */
dvd->vd_iokit_hl = 0;
/* Clear the config */
if (config)
nvlist_free(config);
config = 0;
}
if (allDisks) {
allDisks->flushCollection();
allDisks->release();
allDisks = 0;
}
if (matchedDisk) {
/* Already retained */
dvd->vd_iokit_hl = (void *)matchedDisk;
matchedDisk = 0;
}
if (dvd->vd_iokit_hl != 0) {
return (0);
} else {
return (ENOENT);
}
}
/*
* Check all disks for matching guid
* Assign vd_iokit_t -> vd_iokit_hl
* Returned object will have a reference count and should be released
*/
int
vdev_iokit_find_by_guid(vdev_iokit_t *dvd, uint64_t guid)
{
OSSet * allDisks = 0;
OSObject * currentEntry = 0;
IOMedia * currentDisk = 0;
IOMedia * matchedDisk = 0;
nvlist_t *config = 0;
uint64_t min_size = SPA_MINDEVSIZE; /* 64 Mb */
uint64_t state = 0, txg = 0;
uint64_t current_guid = 0;
if (!dvd || guid == 0)
return (EINVAL);
allDisks = vdev_iokit_get_disks();
if (!allDisks || allDisks->getCount() == 0) {
return (ENOENT);
}
while (allDisks->getCount() > 0) {
/* Get next object */
currentEntry = allDisks->getAnyObject();
if (!currentEntry) {
break;
}
currentDisk = OSDynamicCast(IOMedia, currentEntry);
/* Couldn't cast? */
if (!currentDisk) {
/* Pop from list */
allDisks->removeObject(currentEntry);
currentEntry = 0;
continue;
}
if (currentDisk->getSize() < min_size) {
/* Pop from list */
allDisks->removeObject(currentEntry);
currentEntry = 0;
currentDisk = 0;
continue;
}
/* Temporarily assign currentDisk to the dvd */
dvd->vd_iokit_hl = (void *)currentDisk;
/* Try to read a config label from this disk */
if (vdev_iokit_read_label(dvd, &config) != 0) {
/* Failed to read config */
if (config) {
nvlist_free(config);
config = 0;
}
/* No config found - clear the vd_iokit_hl */
dvd->vd_iokit_hl = 0;
/* Pop from list */
allDisks->removeObject(currentEntry);
currentEntry = 0;
currentDisk = 0;
continue;
}
/* Checking config - clear the vd_iokit_hl meanwhile */
dvd->vd_iokit_hl = 0;
/*
* Check that a valid config was loaded
* skip devices that are unavailable,
* uninitialized, or potentially active
*/
if (nvlist_lookup_uint64(config,
ZPOOL_CONFIG_POOL_STATE, &state) != 0 ||
state > POOL_STATE_L2CACHE) {
nvlist_free(config);
config = 0;
/* Pop from list */
allDisks->removeObject(currentEntry);
currentEntry = 0;
currentDisk = 0;
continue;
}
/*
* Fetch txg number unless spare or l2cache
*/
if (state != POOL_STATE_SPARE &&
state != POOL_STATE_L2CACHE &&
(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_TXG,
&txg) != 0 || txg == 0)) {
nvlist_free(config);
config = 0;
/* Pop from list */
allDisks->removeObject(currentEntry);
currentEntry = 0;
currentDisk = 0;
continue;
}
/* Get and check guid */
if (nvlist_lookup_uint64(config,
ZPOOL_CONFIG_GUID, ¤t_guid) != 0 ||
current_guid != guid) {
current_guid = 0;
nvlist_free(config);
config = 0;
/* Pop from list */
allDisks->removeObject(currentEntry);
currentEntry = 0;
currentDisk = 0;
continue;
}
/* Save it and up the retain count */
matchedDisk = currentDisk;
matchedDisk->retain();
/* Pop from list */
allDisks->removeObject(currentEntry);
currentEntry = 0;
currentDisk = 0;
/* Find by guid breaks on the first match */
if (matchedDisk) {
break;
}
}
if (config) {
nvlist_free(config);
config = 0;
}
if (allDisks) {
allDisks->flushCollection();
allDisks->release();
allDisks = 0;
}
/* Found a match? Save it in dvd as vd_iokit_hl */
if (matchedDisk) {
dvd->vd_iokit_hl = (void *)matchedDisk;
matchedDisk = 0;
}
if (dvd->vd_iokit_hl != 0) {
return (0);
} else {
return (ENOENT);
}
}
/* Returned nvlist should be freed */
extern int vdev_iokit_find_pool(vdev_iokit_t *dvd, char *pool_name)
{
OSSet * allDisks = 0;
OSObject * currentEntry = 0;
IOMedia * currentDisk = 0;
IOMedia * matchedDisk = 0;
nvlist_t *config = 0;
char *cur_pool_name = 0;
uint64_t min_size = SPA_MINDEVSIZE; /* 64 Mb */
uint64_t txg = 0, besttxg = 0;
if (!pool_name)
return (EINVAL);
allDisks = vdev_iokit_get_disks();
if (!allDisks || allDisks->getCount() == 0) {
return (ENOENT);
}
while (allDisks->getCount() > 0) {
/* Get next object */
currentEntry = allDisks->getAnyObject();
if (!currentEntry) {
break;
}
currentDisk = OSDynamicCast(IOMedia, currentEntry);
/* Couldn't cast? */
if (!currentDisk) {
/* Pop from list */
allDisks->removeObject(currentEntry);
currentEntry = 0;
continue;
}
if (currentDisk->getSize() < min_size) {
/* Pop from list */
allDisks->removeObject(currentEntry);
currentEntry = 0;
currentDisk = 0;
continue;
}
/* Temporarily assign currentDisk to the dvd */
dvd->vd_iokit_hl = (void *)currentDisk;
/* Try to read a config label from this disk */
if (vdev_iokit_read_label(dvd, &config) != 0) {
/* Failed to read config */
if (config)
nvlist_free(config);
/* No config found - clear the vd_iokit_hl */
dvd->vd_iokit_hl = 0;
/* Pop from list */
allDisks->removeObject(currentEntry);
currentEntry = 0;
currentDisk = 0;
continue;
}
/* Checking config - clear the vd_iokit_hl meanwhile */
dvd->vd_iokit_hl = 0;
/* Get and check txg and pool name */
if (nvlist_lookup_uint64(config,
ZPOOL_CONFIG_POOL_TXG, &txg) != 0 ||
nvlist_lookup_string(config,
ZPOOL_CONFIG_POOL_NAME, &cur_pool_name) != 0 ||
txg < besttxg || strlen(cur_pool_name) == 0 ||
strncmp(cur_pool_name, pool_name,
strlen(cur_pool_name)) != 0) {
txg = 0;
cur_pool_name = 0;
nvlist_free(config);
config = 0;
/* Pop from list */
allDisks->removeObject(currentEntry);
currentEntry = 0;
currentDisk = 0;
continue;
}
besttxg = txg;
if (matchedDisk) {
matchedDisk->release();
matchedDisk = 0;
}