guard_bio_eod

Name:This allows us to do IO even on the odd last sectors* of a device, even if the block size is some multiple* of the physical sector size

Proto:void guard_bio_eod(struct bio *bio)

Type:void

Parameter:

Type	Parameter	Name
struct bio *	bio

3039

_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

3040

part = __disk_get_part(bi_disk, bi_partno)

3041

If part Then maxsector = 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

3043

Else maxsector = get_capacity(bi_disk)

3045

_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()

3047

If Not maxsector Then Return

3055

If Value for the false possibility is greater at compile time(bi_sector >= maxsector) Then Return

3058

maxsector -= device address in 512 byte sectors

3059

If Value is more likely to compile time(( residual I/O count >> 9) <= maxsector) Then Return

3062

bio_truncate(bio, maxsector << 9)

**Caller**
Name	Describe
submit_bh_wbc
mpage_bio_submit

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