disk_expand_part

Name:disk_expand_part_tbl - expand disk->part_tbl*@disk: disk to expand part_tbl for*@partno: expand such that this partno can fit in* Expand disk->part_tbl such that @partno can fit in. disk->part_tbl

Proto:int disk_expand_part_tbl(struct gendisk *disk, int partno)

Type:int

Parameter:

Type	Parameter	Name
struct gendisk *	disk
int	partno

1288

old_ptbl = cu_dereference_protected() - fetch RCU pointer when updates prevented*@p: The pointer to read, prior to dereferencing*@c: The conditions under which the dereference will take place* Return the value of the specified RCU-protected pointer, but omit( Array of pointers to partitions indexed by partno. * Protected with matching bdev lock but stat and other * non-critical accesses use RCU. Always access through * helpers., 1)

1291

len = If old_ptbl Then len Else 0

1298

target = partno + 1

1299

If target < 0 Then Return -EINVAL

1303

If disk_max_parts(disk) && target > disk_max_parts(disk) Then Return -EINVAL

1306

If target <= len Then Return 0

1309

new_ptbl = kzalloc_node - allocate zeroed memory from a particular memory node.*@size: how many bytes of memory are required.*@flags: the type of memory to allocate (see kmalloc).*@node: memory node from which to allocate

1311

If Not new_ptbl Then Return -ENOMEM

1314

len = target

1316

When i < len cycle cu_assign_pointer() - assign to RCU-protected pointer*@p: pointer to assign to*@v: value to assign (publish)* Assigns the specified value to the specified RCU-protected* pointer, ensuring that any concurrent RCU readers will see* any prior initialization(part[i], part[i])

1319

disk_replace_part_tbl - replace disk->part_tbl in RCU-safe way*@disk: disk to replace part_tbl for*@new_ptbl: new part_tbl to install* Replace disk->part_tbl with @new_ptbl in RCU-safe way. The* original ptbl is freed using RCU callback.* LOCKING:

1320

Return 0

**Caller**
Name	Describe
__alloc_disk_node
add_partition	Must be called either with bd_mutex held, before a disk can be opened or* after all disk users are gone.
blk_add_partitions

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Function report