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zvol: make calls to platform ops static 

There's no need to make the platform ops dynamic dispatch.

This change replaces the dynamic dispatch with static calls to the
platform-specific functions.
To avoid name collisions, prefix all platform-specific functions
with `zvol_os_`.
I actually find `zvol_..._os` slightly nicer to read in the calling
code, but having it as a prefix is useful.

Advantage:
- easier jump-to-definition / grepping
- potential benefits to static analysis
- better legibility

Future work: also prefix remaining `static` functions in zvol_os.c.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Christian Schwarz <christian.schwarz@nutanix.com>
Closes #12965
This commit is contained in:
Christian Schwarz 2022-02-07 19:24:38 +01:00 committed by GitHub
parent f2c5bc150e
commit 1dccfd7a38
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GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 62 additions and 97 deletions
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20
include/sys/zvol_impl.h
View File

@ -93,17 +93,13 @@ void zvol_wait_close(zvol_state_t *zv);
/*
* platform dependent functions exported to platform independent code
*/
typedef struct zvol_platform_ops {
void (*zv_free)(zvol_state_t *);
void (*zv_rename_minor)(zvol_state_t *, const char *);
int (*zv_create_minor)(const char *);
int (*zv_update_volsize)(zvol_state_t *, uint64_t);
boolean_t (*zv_is_zvol)(const char *);
void (*zv_clear_private)(zvol_state_t *);
void (*zv_set_disk_ro)(zvol_state_t *, int flags);
void (*zv_set_capacity)(zvol_state_t *, uint64_t capacity);
} zvol_platform_ops_t;
void zvol_register_ops(const zvol_platform_ops_t *ops);
void zvol_os_free(zvol_state_t *zv);
void zvol_os_rename_minor(zvol_state_t *zv, const char *newname);
int zvol_os_create_minor(const char *name);
int zvol_os_update_volsize(zvol_state_t *zv, uint64_t volsize);
boolean_t zvol_os_is_zvol(const char *path);
void zvol_os_clear_private(zvol_state_t *zv);
void zvol_os_set_disk_ro(zvol_state_t *zv, int flags);
void zvol_os_set_capacity(zvol_state_t *zv, uint64_t capacity);
#endif

46
module/os/freebsd/zfs/zvol_os.c
View File

@ -1196,7 +1196,7 @@ zvol_ensure_zilog(zvol_state_t *zv)
zv->zv_zilog = zil_open(zv->zv_objset,
zvol_get_data);
zv->zv_flags |= ZVOL_WRITTEN_TO;
/* replay / destroy done in zvol_create_minor_impl() */
/* replay / destroy done in zvol_os_create_minor() */
VERIFY0(zv->zv_zilog->zl_header->zh_flags &
ZIL_REPLAY_NEEDED);
}
@ -1204,14 +1204,14 @@ zvol_ensure_zilog(zvol_state_t *zv)
}
}
static boolean_t
zvol_is_zvol_impl(const char *device)
boolean_t
zvol_os_is_zvol(const char *device)
{
return (device && strncmp(device, ZVOL_DIR, strlen(ZVOL_DIR)) == 0);
}
static void
zvol_rename_minor(zvol_state_t *zv, const char *newname)
void
zvol_os_rename_minor(zvol_state_t *zv, const char *newname)
{
ASSERT(RW_LOCK_HELD(&zvol_state_lock));
ASSERT(MUTEX_HELD(&zv->zv_state_lock));
@ -1282,8 +1282,8 @@ zvol_rename_minor(zvol_state_t *zv, const char *newname)
/*
* Remove minor node for the specified volume.
*/
static void
zvol_free(zvol_state_t *zv)
void
zvol_os_free(zvol_state_t *zv)
{
ASSERT(!RW_LOCK_HELD(&zv->zv_suspend_lock));
ASSERT(!MUTEX_HELD(&zv->zv_state_lock));
@ -1324,8 +1324,8 @@ zvol_free(zvol_state_t *zv)
/*
* Create a minor node (plus a whole lot more) for the specified volume.
*/
static int
zvol_create_minor_impl(const char *name)
int
zvol_os_create_minor(const char *name)
{
zvol_state_t *zv;
objset_t *os;
@ -1463,8 +1463,8 @@ out_doi:
return (error);
}
static void
zvol_clear_private(zvol_state_t *zv)
void
zvol_os_clear_private(zvol_state_t *zv)
{
ASSERT(RW_LOCK_HELD(&zvol_state_lock));
if (zv->zv_volmode == ZFS_VOLMODE_GEOM) {
@ -1492,8 +1492,8 @@ zvol_clear_private(zvol_state_t *zv)
}
}
static int
zvol_update_volsize(zvol_state_t *zv, uint64_t volsize)
int
zvol_os_update_volsize(zvol_state_t *zv, uint64_t volsize)
{
zv->zv_volsize = volsize;
if (zv->zv_volmode == ZFS_VOLMODE_GEOM) {
@ -1522,29 +1522,18 @@ zvol_update_volsize(zvol_state_t *zv, uint64_t volsize)
return (0);
}
static void
zvol_set_disk_ro_impl(zvol_state_t *zv, int flags)
void
zvol_os_set_disk_ro(zvol_state_t *zv, int flags)
{
// XXX? set_disk_ro(zv->zv_zso->zvo_disk, flags);
}
static void
zvol_set_capacity_impl(zvol_state_t *zv, uint64_t capacity)
void
zvol_os_set_capacity(zvol_state_t *zv, uint64_t capacity)
{
// XXX? set_capacity(zv->zv_zso->zvo_disk, capacity);
}
const static zvol_platform_ops_t zvol_freebsd_ops = {
.zv_free = zvol_free,
.zv_rename_minor = zvol_rename_minor,
.zv_create_minor = zvol_create_minor_impl,
.zv_update_volsize = zvol_update_volsize,
.zv_clear_private = zvol_clear_private,
.zv_is_zvol = zvol_is_zvol_impl,
.zv_set_disk_ro = zvol_set_disk_ro_impl,
.zv_set_capacity = zvol_set_capacity_impl,
};
/*
* Public interfaces
*/
@ -1559,7 +1548,6 @@ int
zvol_init(void)
{
zvol_init_impl();
zvol_register_ops(&zvol_freebsd_ops);
return (0);
}

44
module/os/linux/zfs/zvol_os.c
View File

@ -86,8 +86,8 @@ zv_request_task_free(zv_request_task_t *task)
/*
* Given a path, return TRUE if path is a ZVOL.
*/
static boolean_t
zvol_is_zvol_impl(const char *path)
boolean_t
zvol_os_is_zvol(const char *path)
{
dev_t dev = 0;
@ -507,7 +507,7 @@ retry:
/*
* Obtain a copy of private_data under the zvol_state_lock to make
* sure that either the result of zvol free code path setting
* bdev->bd_disk->private_data to NULL is observed, or zvol_free()
* bdev->bd_disk->private_data to NULL is observed, or zvol_os_free()
* is not called on this zv because of the positive zv_open_count.
*/
zv = bdev->bd_disk->private_data;
@ -747,8 +747,8 @@ zvol_revalidate_disk(struct gendisk *disk)
return (0);
}
static int
zvol_update_volsize(zvol_state_t *zv, uint64_t volsize)
int
zvol_os_update_volsize(zvol_state_t *zv, uint64_t volsize)
{
struct gendisk *disk = zv->zv_zso->zvo_disk;
@ -762,8 +762,8 @@ zvol_update_volsize(zvol_state_t *zv, uint64_t volsize)
return (0);
}
static void
zvol_clear_private(zvol_state_t *zv)
void
zvol_os_clear_private(zvol_state_t *zv)
{
/*
* Cleared while holding zvol_state_lock as a writer
@ -944,8 +944,8 @@ out_kmem:
* "del_gendisk". Thus, consumers need to be careful to account for this
* latency when calling this function.
*/
static void
zvol_free(zvol_state_t *zv)
void
zvol_os_free(zvol_state_t *zv)
{
ASSERT(!RW_LOCK_HELD(&zv->zv_suspend_lock));
@ -985,7 +985,7 @@ zvol_wait_close(zvol_state_t *zv)
* and the specified volume. Once this function returns the block
* device is live and ready for use.
*/
static int
int
zvol_os_create_minor(const char *name)
{
zvol_state_t *zv;
@ -1122,8 +1122,8 @@ out_doi:
return (error);
}
static void
zvol_rename_minor(zvol_state_t *zv, const char *newname)
void
zvol_os_rename_minor(zvol_state_t *zv, const char *newname)
{
int readonly = get_disk_ro(zv->zv_zso->zvo_disk);
@ -1149,31 +1149,20 @@ zvol_rename_minor(zvol_state_t *zv, const char *newname)
set_disk_ro(zv->zv_zso->zvo_disk, readonly);
}
static void
zvol_set_disk_ro_impl(zvol_state_t *zv, int flags)
void
zvol_os_set_disk_ro(zvol_state_t *zv, int flags)
{
set_disk_ro(zv->zv_zso->zvo_disk, flags);
}
static void
zvol_set_capacity_impl(zvol_state_t *zv, uint64_t capacity)
void
zvol_os_set_capacity(zvol_state_t *zv, uint64_t capacity)
{
set_capacity(zv->zv_zso->zvo_disk, capacity);
}
const static zvol_platform_ops_t zvol_linux_ops = {
.zv_free = zvol_free,
.zv_rename_minor = zvol_rename_minor,
.zv_create_minor = zvol_os_create_minor,
.zv_update_volsize = zvol_update_volsize,
.zv_clear_private = zvol_clear_private,
.zv_is_zvol = zvol_is_zvol_impl,
.zv_set_disk_ro = zvol_set_disk_ro_impl,
.zv_set_capacity = zvol_set_capacity_impl,
};
int
zvol_init(void)
{
@ -1193,7 +1182,6 @@ zvol_init(void)
}
zvol_init_impl();
ida_init(&zvol_ida);
zvol_register_ops(&zvol_linux_ops);
return (0);
}

49
module/zfs/zvol.c
View File

@ -92,7 +92,6 @@ unsigned int zvol_volmode = ZFS_VOLMODE_GEOM;
struct hlist_head *zvol_htable;
static list_t zvol_state_list;
krwlock_t zvol_state_lock;
static const zvol_platform_ops_t *ops;
typedef enum {
ZVOL_ASYNC_REMOVE_MINORS,
@ -365,7 +364,7 @@ out:
mutex_exit(&zv->zv_state_lock);
if (error == 0 && zv != NULL)
ops->zv_update_volsize(zv, volsize);
zvol_os_update_volsize(zv, volsize);
return (SET_ERROR(error));
}
@ -747,15 +746,15 @@ zvol_setup_zv(zvol_state_t *zv)
if (error)
return (SET_ERROR(error));
ops->zv_set_capacity(zv, volsize >> 9);
zvol_os_set_capacity(zv, volsize >> 9);
zv->zv_volsize = volsize;
if (ro || dmu_objset_is_snapshot(os) ||
!spa_writeable(dmu_objset_spa(os))) {
ops->zv_set_disk_ro(zv, 1);
zvol_os_set_disk_ro(zv, 1);
zv->zv_flags |= ZVOL_RDONLY;
} else {
ops->zv_set_disk_ro(zv, 0);
zvol_os_set_disk_ro(zv, 0);
zv->zv_flags &= ~ZVOL_RDONLY;
}
return (0);
@ -1119,7 +1118,7 @@ zvol_create_minors_recursive(const char *name)
* taskq_dispatch to parallel prefetch zvol dnodes. Note we don't need
* any lock because all list operation is done on the current thread.
*
* We will use this list to do zvol_create_minor_impl after prefetch
* We will use this list to do zvol_os_create_minor after prefetch
* so we don't have to traverse using dmu_objset_find again.
*/
list_create(&minors_list, sizeof (minors_job_t),
@ -1133,7 +1132,7 @@ zvol_create_minors_recursive(const char *name)
&snapdev, NULL);
if (error == 0 && snapdev == ZFS_SNAPDEV_VISIBLE)
(void) ops->zv_create_minor(name);
(void) zvol_os_create_minor(name);
} else {
fstrans_cookie_t cookie = spl_fstrans_mark();
(void) dmu_objset_find(name, zvol_create_minors_cb,
@ -1144,13 +1143,13 @@ zvol_create_minors_recursive(const char *name)
taskq_wait_outstanding(system_taskq, 0);
/*
* Prefetch is completed, we can do zvol_create_minor_impl
* Prefetch is completed, we can do zvol_os_create_minor
* sequentially.
*/
while ((job = list_head(&minors_list)) != NULL) {
list_remove(&minors_list, job);
if (!job->error)
(void) ops->zv_create_minor(job->name);
(void) zvol_os_create_minor(job->name);
kmem_strfree(job->name);
kmem_free(job, sizeof (minors_job_t));
}
@ -1180,9 +1179,9 @@ zvol_create_minor(const char *name)
"snapdev", &snapdev, NULL);
if (error == 0 && snapdev == ZFS_SNAPDEV_VISIBLE)
(void) ops->zv_create_minor(name);
(void) zvol_os_create_minor(name);
} else {
(void) ops->zv_create_minor(name);
(void) zvol_os_create_minor(name);
}
}
@ -1193,7 +1192,7 @@ zvol_create_minor(const char *name)
static void
zvol_free_task(void *arg)
{
ops->zv_free(arg);
zvol_os_free(arg);
}
void
@ -1238,7 +1237,7 @@ zvol_remove_minors_impl(const char *name)
* Cleared while holding zvol_state_lock as a writer
* which will prevent zvol_open() from opening it.
*/
ops->zv_clear_private(zv);
zvol_os_clear_private(zv);
/* Drop zv_state_lock before zvol_free() */
mutex_exit(&zv->zv_state_lock);
@ -1257,7 +1256,7 @@ zvol_remove_minors_impl(const char *name)
/* Drop zvol_state_lock before calling zvol_free() */
while ((zv = list_head(&free_list)) != NULL) {
list_remove(&free_list, zv);
ops->zv_free(zv);
zvol_os_free(zv);
}
}
@ -1290,7 +1289,7 @@ zvol_remove_minor_impl(const char *name)
}
zvol_remove(zv);
ops->zv_clear_private(zv);
zvol_os_clear_private(zv);
mutex_exit(&zv->zv_state_lock);
break;
} else {
@ -1302,7 +1301,7 @@ zvol_remove_minor_impl(const char *name)
rw_exit(&zvol_state_lock);
if (zv != NULL)
ops->zv_free(zv);
zvol_os_free(zv);
}
/*
@ -1327,14 +1326,14 @@ zvol_rename_minors_impl(const char *oldname, const char *newname)
mutex_enter(&zv->zv_state_lock);
if (strcmp(zv->zv_name, oldname) == 0) {
ops->zv_rename_minor(zv, newname);
zvol_os_rename_minor(zv, newname);
} else if (strncmp(zv->zv_name, oldname, oldnamelen) == 0 &&
(zv->zv_name[oldnamelen] == '/' ||
zv->zv_name[oldnamelen] == '@')) {
char *name = kmem_asprintf("%s%c%s", newname,
zv->zv_name[oldnamelen],
zv->zv_name + oldnamelen + 1);
ops->zv_rename_minor(zv, name);
zvol_os_rename_minor(zv, name);
kmem_strfree(name);
}
@ -1358,7 +1357,7 @@ zvol_set_snapdev_cb(const char *dsname, void *param)
switch (arg->snapdev) {
case ZFS_SNAPDEV_VISIBLE:
(void) ops->zv_create_minor(dsname);
(void) zvol_os_create_minor(dsname);
break;
case ZFS_SNAPDEV_HIDDEN:
(void) zvol_remove_minor_impl(dsname);
@ -1415,14 +1414,14 @@ zvol_set_volmode_impl(char *name, uint64_t volmode)
case ZFS_VOLMODE_GEOM:
case ZFS_VOLMODE_DEV:
(void) zvol_remove_minor_impl(name);
(void) ops->zv_create_minor(name);
(void) zvol_os_create_minor(name);
break;
case ZFS_VOLMODE_DEFAULT:
(void) zvol_remove_minor_impl(name);
if (zvol_volmode == ZFS_VOLMODE_NONE)
break;
else /* if zvol_volmode is invalid defaults to "geom" */
(void) ops->zv_create_minor(name);
(void) zvol_os_create_minor(name);
break;
}
spl_fstrans_unmark(cookie);
@ -1699,13 +1698,7 @@ boolean_t
zvol_is_zvol(const char *name)
{
return (ops->zv_is_zvol(name));
}
void
zvol_register_ops(const zvol_platform_ops_t *zvol_ops)
{
ops = zvol_ops;
return (zvol_os_is_zvol(name));
}
int