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ZVOL: Unify zvol minors operations and improve error handling

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Now zvol minors creation logic is passed thru spa_zvol_taskq, like it
is doing for remove/rename zvol minors functions. Appropriate
zvol minors creation functions are refactored:
- The zvol_create_minor()/zvol_minors_create_recursive() were removed.
- The single zvol_create_minors() is added instead.

Also, it become possible to collect zvol minors subtasks status, to
detect, if some zvol minor subtask is failed in the subtasks chain.
The appropriate message is reported to zfs_dbgmsg buffer in this case.

Sponsored-by: vStack, Inc.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Signed-off-by: Fedor Uporov <fuporov.vstack@gmail.com>
Closes #17575
This commit is contained in:
Fedor Uporov
2025-08-06 17:10:52 +03:00
committed by GitHub
parent 0f8a1105ee
commit 0b6fd024a7
12 changed files with 265 additions and 180 deletions
Download Patch File Download Diff File Expand all files Collapse all files
module/os/linux/zfs/zvol_os.c
+20 -16
View File
@@ -1302,27 +1302,30 @@ zvol_alloc_blk_mq(zvol_state_t *zv, zvol_queue_limits_t *limits)
* Allocate memory for a new zvol_state_t and setup the required
* request queue and generic disk structures for the block device.
*/
static zvol_state_t *
zvol_alloc(dev_t dev, const char *name, uint64_t volblocksize)
static int
zvol_alloc(dev_t dev, const char *name, uint64_t volsize, uint64_t volblocksize,
zvol_state_t **zvp)
{
zvol_state_t *zv;
struct zvol_state_os *zso;
uint64_t volmode;
int ret;
if (dsl_prop_get_integer(name, "volmode", &volmode, NULL) != 0)
return (NULL);
ret = dsl_prop_get_integer(name, "volmode", &volmode, NULL);
if (ret)
return (ret);
if (volmode == ZFS_VOLMODE_DEFAULT)
volmode = zvol_volmode;
if (volmode == ZFS_VOLMODE_NONE)
return (NULL);
return (0);
zv = kmem_zalloc(sizeof (zvol_state_t), KM_SLEEP);
zso = kmem_zalloc(sizeof (struct zvol_state_os), KM_SLEEP);
zv->zv_zso = zso;
zv->zv_volmode = volmode;
zv->zv_volsize = volsize;
zv->zv_volblocksize = volblocksize;
list_link_init(&zv->zv_next);
@@ -1396,12 +1399,13 @@ zvol_alloc(dev_t dev, const char *name, uint64_t volblocksize)
snprintf(zso->zvo_disk->disk_name, DISK_NAME_LEN, "%s%d",
ZVOL_DEV_NAME, (dev & MINORMASK));
return (zv);
*zvp = zv;
return (ret);
out_kmem:
kmem_free(zso, sizeof (struct zvol_state_os));
kmem_free(zv, sizeof (zvol_state_t));
return (NULL);
return (ret);
}
/*
@@ -1562,7 +1566,7 @@ zvol_os_add_disk(struct gendisk *disk)
int
zvol_os_create_minor(const char *name)
{
zvol_state_t *zv;
zvol_state_t *zv = NULL;
objset_t *os;
dmu_object_info_t *doi;
uint64_t volsize;
@@ -1611,18 +1615,16 @@ zvol_os_create_minor(const char *name)
if (error)
goto out_dmu_objset_disown;
zv = zvol_alloc(MKDEV(zvol_major, minor), name,
doi->doi_data_block_size);
if (zv == NULL) {
error = SET_ERROR(EAGAIN);
error = zvol_alloc(MKDEV(zvol_major, minor), name,
volsize, doi->doi_data_block_size, &zv);
if (error || zv == NULL)
goto out_dmu_objset_disown;
}
zv->zv_hash = hash;
if (dmu_objset_is_snapshot(os))
zv->zv_flags |= ZVOL_RDONLY;
zv->zv_volsize = volsize;
zv->zv_objset = os;
/* Default */
@@ -1689,7 +1691,7 @@ out_doi:
* zvol_open()->zvol_first_open() and zvol_release()->zvol_last_close()
* directly as well.
*/
if (error == 0) {
if (error == 0 && zv) {
rw_enter(&zvol_state_lock, RW_WRITER);
zvol_insert(zv);
rw_exit(&zvol_state_lock);
@@ -1701,7 +1703,7 @@ out_doi:
return (error);
}
void
int
zvol_os_rename_minor(zvol_state_t *zv, const char *newname)
{
int readonly = get_disk_ro(zv->zv_zso->zvo_disk);
@@ -1728,6 +1730,8 @@ zvol_os_rename_minor(zvol_state_t *zv, const char *newname)
set_disk_ro(zv->zv_zso->zvo_disk, readonly);
dataset_kstats_rename(&zv->zv_kstat, newname);
return (0);
}
void