Re: [PATCH v2 16/21] conf: introduce a virNWFilterBindingObjListPtr struct

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On 05/15/2018 01:43 PM, Daniel P. Berrangé wrote:
> Introduce a new struct to act as the manager of a collection of
> virNWFilterBindingObjPtr objects.
> ---
>  src/conf/Makefile.inc.am             |   2 +
>  src/conf/virnwfilterbindingobjlist.c | 475 +++++++++++++++++++++++++++
>  src/conf/virnwfilterbindingobjlist.h |  66 ++++
>  src/libvirt_private.syms             |  11 +
>  4 files changed, 554 insertions(+)
>  create mode 100644 src/conf/virnwfilterbindingobjlist.c
>  create mode 100644 src/conf/virnwfilterbindingobjlist.h
> 

[...]

> diff --git a/src/conf/virnwfilterbindingobjlist.c b/src/conf/virnwfilterbindingobjlist.c
> new file mode 100644
> index 0000000000..bf0869a216
> --- /dev/null
> +++ b/src/conf/virnwfilterbindingobjlist.c
> @@ -0,0 +1,475 @@
> +/*
> + * virnwfilterbindingobjlist.c: binding objects list utilities
> + *
> + * Copyright (C) 2006-2018 Red Hat, Inc.
> + * Copyright (C) 2006-2008 Daniel P. Berrange
> + * Copyright (c) 2015 SUSE LINUX Products GmbH, Nuernberg, Germany.

All of them? Why not more like the *bindingobj.c...

> + *
> + * This library is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU Lesser General Public
> + * License as published by the Free Software Foundation; either
> + * version 2.1 of the License, or (at your option) any later version.
> + *

[...]

> +
> +virNWFilterBindingObjListPtr virNWFilterBindingObjListNew(void)

virNWFilterBindingObjListPtr
virNWFilterBindingObjListNew(void)

> +{
> +    virNWFilterBindingObjListPtr bindings;
> +
> +    if (virNWFilterBindingObjListInitialize() < 0)
> +        return NULL;
> +
> +    if (!(bindings = virObjectRWLockableNew(virNWFilterBindingObjListClass)))
> +        return NULL;
> +
> +    if (!(bindings->objs = virHashCreate(50, virObjectFreeHashData))) {
> +        virObjectUnref(bindings);
> +        return NULL;
> +    }
> +
> +    return bindings;
> +}
> +
> +static void virNWFilterBindingObjListDispose(void *obj)

static void
virNWFilterBindingObjListDispose(void *obj)

> +{
> +    virNWFilterBindingObjListPtr bindings = obj;
> +
> +    virHashFree(bindings->objs);
> +}

[...]

> +/**
> + * @bindings: NWFilterBinding object list pointer
> + * @binding: NWFilterBinding object to be added
> + *
> + * Upon entry @binding should have at least 1 ref and be locked.
> + *
> + * Add the @binding into the @bindings->objs hash
> + * tables. Once successfully added into a table, increase the
> + * reference count since upon removal in virHashRemoveEntry
> + * the virObjectUnref will be called since the hash tables were
> + * configured to call virObjectFreeHashData when the object is
> + * removed from the hash table.
> + *
> + * Returns 0 on success with 3 references and locked

2 refs - 1 from ObjNew and 1 from ObjRef

> + *        -1 on failure with 1 reference and locked
> + */
> +static int
> +virNWFilterBindingObjListAddObjLocked(virNWFilterBindingObjListPtr bindings,
> +                                      virNWFilterBindingObjPtr binding)
> +{
> +    if (virHashAddEntry(bindings->objs, binding->def->portdevname, binding) < 0)
> +        return -1;
> +    virObjectRef(binding);
> +
> +    return 0;
> +}
> +
> +
> +/*
> + * virNWFilterBindingObjListAddLocked:
> + *
> + * The returned @binding from this function will be locked and ref
> + * counted. The caller is expected to use virNWFilterBindingObjEndAPI
> + * when it completes usage.
> + */
> +static virNWFilterBindingObjPtr
> +virNWFilterBindingObjListAddLocked(virNWFilterBindingObjListPtr bindings,
> +                                   virNWFilterBindingDefPtr def)
> +{
> +    virNWFilterBindingObjPtr binding;
> +
> +    /* See if a BINDING with matching portdev already exists */
> +    if ((binding = virNWFilterBindingObjListFindByPortDevLocked(bindings, def->portdevname))) {

That's a long line

> +        virReportError(VIR_ERR_OPERATION_FAILED,
> +                       _("binding '%s' already exists"),
> +                       def->portdevname);
> +        return NULL;

@binding is returned reffed and locked, so we need to EndAPI on it - so
goto error here.

> +    }
> +
> +    if (!(binding = virNWFilterBindingObjNew()))
> +        goto cleanup;
> +    binding->def = def;
> +
> +    if (virNWFilterBindingObjListAddObjLocked(bindings, binding) < 0)
> +        goto error;
> +
> + cleanup:
> +    return binding;
> +
> + error:
> +    virNWFilterBindingObjEndAPI(&binding);
> +    return NULL;
> +}
> +
> +
> +virNWFilterBindingObjPtr virNWFilterBindingObjListAdd(virNWFilterBindingObjListPtr bindings,
> +                                                      virNWFilterBindingDefPtr def)

virNWFilterBindingObjPtr
virNWFilterBindingObjListAdd(virNWFilterBindingObjListPtr bindings,
                             virNWFilterBindingDefPtr def)

> +{
> +    virNWFilterBindingObjPtr ret;
> +
> +    virObjectRWLockWrite(bindings);
> +    ret = virNWFilterBindingObjListAddLocked(bindings, def);
> +    virObjectRWUnlock(bindings);
> +    return ret;
> +}
> +
> +
> +/* The caller must hold lock on 'bindings' in addition to 'virNWFilterBindingObjListRemove'
> + * requirements
> + *
> + * Can be used to remove current element while iterating with
> + * virNWFilterBindingObjListForEach
> + */
> +void

static void

> +virNWFilterBindingObjListRemoveLocked(virNWFilterBindingObjListPtr bindings,
> +                                      virNWFilterBindingObjPtr binding)
> +{
> +    virHashRemoveEntry(bindings->objs, binding->def->portdevname);

If _virNWFilterBindingObj becomes private then need accessor for @def...
Something not generally necessary in other code since Obj and ObjList
"live" in the same module.

> +}
> +
> +
> +/**
> + * @bindings: Pointer to the binding object list
> + * @binding: NWFilterBinding pointer from either after Add or FindBy* API where the
> + *       @binding was successfully added to both the bindings->objs

added to the bindings->objs

> + *       hash tables that now would need to be removed.

hash table

> + *
> + * The caller must hold a lock on the driver owning 'bindings',

^^ is this part necessarily true any more since we have self locking
lists?  Although for nwfilter - it's one of those that hasn't yet been
converted to the hash table model, so I guess depends on the consumer.

> + * and must also have locked and ref counted 'binding', to ensure
> + * no one else is either waiting for 'binding' or still using it.
> + *
> + * When this function returns, @binding will be removed from the hash
> + * tables and returned with lock and refcnt that was present upon entry.
> + */
> +void
> +virNWFilterBindingObjListRemove(virNWFilterBindingObjListPtr bindings,
> +                                virNWFilterBindingObjPtr binding)
> +{
> +    binding->removing = true;
> +    virObjectRef(binding);
> +    virObjectUnlock(binding);
> +    virObjectRWLockWrite(bindings);
> +    virObjectLock(binding);
> +    virNWFilterBindingObjListRemoveLocked(bindings, binding);
> +    virObjectUnref(binding);
> +    virObjectRWUnlock(bindings);
> +}
> +
> +
> +static virNWFilterBindingObjPtr
> +virNWFilterBindingObjListLoadStatus(virNWFilterBindingObjListPtr bindings,
> +                                    const char *statusDir,
> +                                    const char *name)
> +{
> +    char *statusFile = NULL;
> +    virNWFilterBindingObjPtr obj = NULL;
> +
> +    if ((statusFile = virNWFilterBindingObjConfigFile(statusDir, name)) == NULL)
> +        goto error;
> +
> +    if (!(obj = virNWFilterBindingObjParseFile(statusFile)))
> +        goto error;
> +
> +    if (virHashLookup(bindings->objs, obj->def->portdevname) != NULL) {

If _virNWFilterBindingObj becomes private, then this would require an
accessor for obj->def...

> +        virReportError(VIR_ERR_INTERNAL_ERROR,
> +                       _("unexpected binding %s already exists"),
> +                       obj->def->portdevname);
> +        goto error;
> +    }
> +
> +    if (virNWFilterBindingObjListAddObjLocked(bindings, obj) < 0)
> +        goto error;
> +
> +    VIR_FREE(statusFile);
> +    return obj;
> +
> + error:
> +    virNWFilterBindingObjEndAPI(&obj);
> +    VIR_FREE(statusFile);
> +    return NULL;
> +}
> +
> +
> +int
> +virNWFilterBindingObjListLoadAllConfigs(virNWFilterBindingObjListPtr bindings,
> +                                        const char *configDir)
> +{
> +    DIR *dir;
> +    struct dirent *entry;
> +    int ret = -1;
> +    int rc;
> +
> +    VIR_INFO("Scanning for configs in %s", configDir);
> +
> +    if ((rc = virDirOpenIfExists(&dir, configDir)) <= 0)
> +        return rc;
> +
> +    virObjectRWLockWrite(bindings);
> +
> +    while ((ret = virDirRead(dir, &entry, configDir)) > 0) {
> +        virNWFilterBindingObjPtr binding;
> +
> +        if (!virFileStripSuffix(entry->d_name, ".xml"))
> +            continue;
> +
> +        /* NB: ignoring errors, so one malformed config doesn't
> +           kill the whole process */
> +        VIR_INFO("Loading config file '%s.xml'", entry->d_name);
> +        binding = virNWFilterBindingObjListLoadStatus(bindings,
> +                                                      configDir,
> +                                                      entry->d_name);
> +        if (binding) {
> +            virNWFilterBindingObjEndAPI(&binding);
> +        } else {
> +            VIR_ERROR(_("Failed to load config for binding '%s'"), entry->d_name);
> +        }

The { } { } aren't necessary, but syntax-check doesn't complain either

> +    }
> +
> +    VIR_DIR_CLOSE(dir);
> +    virObjectRWUnlock(bindings);
> +    return ret;
> +}
> +
> +

[...]

> +static void
> +virNWFilterBindingObjListFilter(virNWFilterBindingObjPtr **list,
> +                                size_t *nbindings,
> +                                virConnectPtr conn,
> +                                virNWFilterBindingObjListACLFilter filter)
> +{
> +    size_t i = 0;
> +
> +    while (i < *nbindings) {
> +        virNWFilterBindingObjPtr binding = (*list)[i];
> +
> +        virObjectLock(binding);
> +
> +        /* do not list the object if:
> +         * 1) it's being removed.
> +         * 2) connection does not have ACL to see it
> +         * 3) it doesn't match the filter
> +         */
> +        if (binding->removing ||
> +            (filter && !filter(conn, binding->def))) {

If @binding is private, then use accessor.

> +            virObjectUnlock(binding);
> +            virObjectUnref(binding);
> +            VIR_DELETE_ELEMENT(*list, i, *nbindings);
> +            continue;
> +        }
> +
> +        virObjectUnlock(binding);
> +        i++;
> +    }
> +}
> +
> +
> +static int
> +virNWFilterBindingObjListCollect(virNWFilterBindingObjListPtr domlist,
> +                                 virConnectPtr conn,
> +                                 virNWFilterBindingObjPtr **bindings,
> +                                 size_t *nbindings,
> +                                 virNWFilterBindingObjListACLFilter filter)
> +{
> +    struct virNWFilterBindingListData data = { NULL, 0 };
> +
> +    virObjectRWLockRead(domlist);
> +    sa_assert(domlist->objs);
> +    if (VIR_ALLOC_N(data.bindings, virHashSize(domlist->objs)) < 0) {
> +        virObjectRWUnlock(domlist);
> +        return -1;
> +    }
> +
> +    virHashForEach(domlist->objs, virNWFilterBindingObjListCollectIterator, &data);
> +    virObjectRWUnlock(domlist);
> +
> +    virNWFilterBindingObjListFilter(&data.bindings, &data.nbindings, conn, filter);
> +
> +    *nbindings = data.nbindings;
> +    *bindings = data.bindings;
> +
> +    return 0;
> +}
> +
> +
> +int
> +virNWFilterBindingObjListExport(virNWFilterBindingObjListPtr bindings,
> +                                virConnectPtr conn,
> +                                virNWFilterBindingPtr **bindinglist,
> +                                virNWFilterBindingObjListACLFilter filter)
> +{
> +    virNWFilterBindingObjPtr *bindingobjs = NULL;
> +    size_t nbindings = 0;
> +    size_t i;
> +    int ret = -1;
> +
> +    if (virNWFilterBindingObjListCollect(bindings, conn, &bindingobjs, &nbindings, filter) < 0)

long line

> +        return -1;
> +
> +    if (bindinglist) {
> +        if (VIR_ALLOC_N(*bindinglist, nbindings + 1) < 0)
> +            goto cleanup;
> +
> +        for (i = 0; i < nbindings; i++) {
> +            virNWFilterBindingObjPtr binding = bindingobjs[i];
> +
> +            virObjectLock(binding);
> +            (*bindinglist)[i] = virGetNWFilterBinding(conn, binding->def->portdevname, binding->def->filter);

Long line... also another place to have an accessor binding->def

> +            virObjectUnlock(binding);
> +
> +            if (!(*bindinglist)[i])
> +                goto cleanup;
> +        }
> +    }
> +
> +    ret = nbindings;
> +
> + cleanup:
> +    virObjectListFreeCount(bindingobjs, nbindings);
> +    if (ret < 0) {
> +        virObjectListFreeCount(*bindinglist, nbindings);
> +        *bindinglist = NULL;
> +    }
> +    return ret;
> +}
> diff --git a/src/conf/virnwfilterbindingobjlist.h b/src/conf/virnwfilterbindingobjlist.h
> new file mode 100644
> index 0000000000..252da90baa
> --- /dev/null
> +++ b/src/conf/virnwfilterbindingobjlist.h
> @@ -0,0 +1,66 @@
> +/*
> + * virnwfilterbindingobjlist.h: domain objects list utilities

well I know where you copied this from ;-)

> + *
> + * Copyright (C) 2006-2018 Red Hat, Inc.
> + * Copyright (C) 2006-2008 Daniel P. Berrange
> + * Copyright (c) 2015 SUSE LINUX Products GmbH, Nuernberg, Germany.

Similar to above.

> + *
> + * This library is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU Lesser General Public
> + * License as published by the Free Software Foundation; either
> + * version 2.1 of the License, or (at your option) any later version.
> + *
> + * This library is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * Lesser General Public License for more details.
> + *
> + * You should have received a copy of the GNU Lesser General Public
> + * License along with this library.  If not, see
> + * <http://www.gnu.org/licenses/>.
> + *
> + * Author: Daniel P. Berrange <berrange@xxxxxxxxxx>
> + */
> +
> +#ifndef __VIRNWFILTERBINDINGOBJ_H__
> +# define __VIRNWFILTERBINDINGOBJT_H__

VIR_NWFILTER_BINDING_OBJ_LIST_H

(3 occurrences)

> +
> +# include "virnwfilterbindingobj.h"
> +
> +typedef struct _virNWFilterBindingObjList virNWFilterBindingObjList;
> +typedef virNWFilterBindingObjList *virNWFilterBindingObjListPtr;
> +

These are some long lines - just format like the .c file..

> +virNWFilterBindingObjListPtr virNWFilterBindingObjListNew(void);
> +
> +virNWFilterBindingObjPtr virNWFilterBindingObjListFindByPortDev(virNWFilterBindingObjListPtr bindings,
> +                                                                const char *name);
> +
> +virNWFilterBindingObjPtr virNWFilterBindingObjListAdd(virNWFilterBindingObjListPtr bindings,
> +                                                      virNWFilterBindingDefPtr def);
> +
> +void virNWFilterBindingObjListRemove(virNWFilterBindingObjListPtr bindings,
> +                                     virNWFilterBindingObjPtr binding);
> +void virNWFilterBindingObjListRemoveLocked(virNWFilterBindingObjListPtr bindings,
> +                                           virNWFilterBindingObjPtr binding);
> +
> +int virNWFilterBindingObjListLoadAllConfigs(virNWFilterBindingObjListPtr bindings,
> +                                            const char *configDir);
> +
> +
> +typedef int (*virNWFilterBindingObjListIterator)(virNWFilterBindingObjPtr binding,
> +                                                 void *opaque);
> +
> +int virNWFilterBindingObjListForEach(virNWFilterBindingObjListPtr bindings,
> +                                     virNWFilterBindingObjListIterator callback,
> +                                     void *opaque);
> +
> +typedef bool (*virNWFilterBindingObjListACLFilter)(virConnectPtr conn,
> +                                                   virNWFilterBindingDefPtr def);
> +
> +int virNWFilterBindingObjListExport(virNWFilterBindingObjListPtr bindings,
> +                                    virConnectPtr conn,
> +                                    virNWFilterBindingPtr **bindinglist,
> +                                    virNWFilterBindingObjListACLFilter filter);
> +
> +
> +#endif /* __VIRNWFILTERBINDINGOBJLIST_H__ */

John

[...]

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