disk_part_iter

Name:disk_part_iter_next - proceed iterator to the next partition and return it*@piter: iterator of interest* Proceed @piter to the next partition and return it.* CONTEXT:* Don't care.

Proto:struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter)

Type:struct hd_struct

Parameter:

Type	Parameter	Name
struct disk_part_iter *	piter

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disk_put_part(part)

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part = NULL

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_read_lock() - mark the beginning of an RCU read-side critical section* When synchronize_rcu() is invoked on one CPU while other CPUs* are within RCU read-side critical sections, then the* synchronize_rcu() is guaranteed to block until after all the other

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ptbl = fetch RCU-protected pointer for dereferencing( 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.)

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If flags & rate in the reverse direction Then

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inc = -1

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If flags & (clude partition 0 | clude empty partition 0 ) Then end = -1

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Else end = 0

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Else

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inc = 1

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end = len

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When idx != end cycle

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part = fetch RCU-protected pointer for dereferencing(part[idx])

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If Not part Then Continue

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If Not Any access of part->nr_sects which is not protected by partition* bd_mutex or gendisk bdev bd_mutex, should be done using this* accessor function && Not (flags & clude 0-sized parts ) && Not ( flags & clude empty partition 0 && idx == 0 ) Then Continue

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get_device - atomically increment the reference count for the device.

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part = part

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idx += inc

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Break

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_read_unlock() - marks the end of an RCU read-side critical section.* In most situations, rcu_read_unlock() is immune from deadlock.* However, in kernels built with CONFIG_RCU_BOOST, rcu_read_unlock()

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Return part

**Caller**
Name	Describe
blkpg_ioctl
register_disk
del_gendisk
printk_all_partitions	print a full list of all partitions - intended for places where the root* filesystem can't be mounted and thus to give the victim some idea of what* went wrong
show_partition
diskstats_show	aggregate disk stat collector. Uses the same stats that the sysfs* entries do, above, but makes them available through one seq_file.* The output looks suspiciously like /proc/partitions with a bunch of* extra fields.
set_disk_ro
blk_drop_partitions

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