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writeback: use RCU to protect bdi_list

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Now that bdi_writeback_all() no longer handles integrity writeback,
it doesn't have to block anymore. This means that we can switch
bdi_list reader side protection to RCU.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe
2009-09-14 13:12:40 +02:00
parent f11fcae840
commit cfc4ba5365
4 changed files with 63 additions and 28 deletions
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include/linux/backing-dev.h
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@@ -59,6 +59,7 @@ struct bdi_writeback {
struct backing_dev_info {
struct list_head bdi_list;
struct rcu_head rcu_head;
unsigned long ra_pages; /* max readahead in PAGE_CACHE_SIZE units */
unsigned long state; /* Always use atomic bitops on this */
unsigned int capabilities; /* Device capabilities */