wb_check_old_data_flush

Name:wb_check_old_data_flush

Proto:static long wb_check_old_data_flush(struct bdi_writeback *wb)

Type:long

Parameter:

Type	Parameter	Name
struct bdi_writeback *	wb

1976

If Not centiseconds Then Return 0

1979

expired = last old data flush + msecs_to_jiffies: - convert milliseconds to jiffies*@m: time in milliseconds* conversion is done as follows:* - negative values mean 'infinite timeout' (MAX_JIFFY_OFFSET)* - 'too large' values [that would result in larger than

1981

If time_before(jiffies, expired) Then Return 0

1984

last old data flush = jiffies

1985

nr_pages = Add in the number of potentially dirty inodes, because each inode* write can dirty pagecache in the underlying blockdev.

1987

If nr_pages Then

1988

struct wb_writeback_work work = {nr_pages = nr_pages, sync_mode = Don't wait on anything , for_kupdate = 1, range_cyclic = 1, why was writeback initiated? = WB_REASON_PERIODIC, }

1996

Return Explicit flushing or periodic writeback of "old" data

1999

Return 0

**Caller**
Name	Describe
wb_do_writeback	Retrieve work items and do the writeback they describe

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