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authorTejun Heo <tj@kernel.org>2015-05-22 17:13:26 -0400
committerJens Axboe <axboe@fb.com>2015-06-02 08:33:34 -0600
commit4452226ea276e74fc3e252c88d9bb7e8f8e44bf0 (patch)
tree793638cb2a6a027a84ec9cd69fc6cd68c330c212 /include/linux/backing-dev.h
parentad7fa852d3d2816d68a138ebc5bc8967aeb7fd86 (diff)
writeback: move backing_dev_info->state into bdi_writeback
Currently, a bdi (backing_dev_info) embeds single wb (bdi_writeback) and the role of the separation is unclear. For cgroup support for writeback IOs, a bdi will be updated to host multiple wb's where each wb serves writeback IOs of a different cgroup on the bdi. To achieve that, a wb should carry all states necessary for servicing writeback IOs for a cgroup independently. This patch moves bdi->state into wb. * enum bdi_state is renamed to wb_state and the prefix of all enums is changed from BDI_ to WB_. * Explicit zeroing of bdi->state is removed without adding zeoring of wb->state as the whole data structure is zeroed on init anyway. * As there's still only one bdi_writeback per backing_dev_info, all uses of bdi->state are mechanically replaced with bdi->wb.state introducing no behavior changes. Signed-off-by: Tejun Heo <tj@kernel.org> Reviewed-by: Jan Kara <jack@suse.cz> Cc: Jens Axboe <axboe@kernel.dk> Cc: Wu Fengguang <fengguang.wu@intel.com> Cc: drbd-dev@lists.linbit.com Cc: Neil Brown <neilb@suse.de> Cc: Alasdair Kergon <agk@redhat.com> Cc: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'include/linux/backing-dev.h')
-rw-r--r--include/linux/backing-dev.h24
1 files changed, 12 insertions, 12 deletions
diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h
index aff923ae8c4b..eb14f988a63e 100644
--- a/include/linux/backing-dev.h
+++ b/include/linux/backing-dev.h
@@ -25,13 +25,13 @@ struct device;
struct dentry;
/*
- * Bits in backing_dev_info.state
+ * Bits in bdi_writeback.state
*/
-enum bdi_state {
- BDI_async_congested, /* The async (write) queue is getting full */
- BDI_sync_congested, /* The sync queue is getting full */
- BDI_registered, /* bdi_register() was done */
- BDI_writeback_running, /* Writeback is in progress */
+enum wb_state {
+ WB_async_congested, /* The async (write) queue is getting full */
+ WB_sync_congested, /* The sync queue is getting full */
+ WB_registered, /* bdi_register() was done */
+ WB_writeback_running, /* Writeback is in progress */
};
typedef int (congested_fn)(void *, int);
@@ -49,6 +49,7 @@ enum bdi_stat_item {
struct bdi_writeback {
struct backing_dev_info *bdi; /* our parent bdi */
+ unsigned long state; /* Always use atomic bitops on this */
unsigned long last_old_flush; /* last old data flush */
struct delayed_work dwork; /* work item used for writeback */
@@ -62,7 +63,6 @@ struct bdi_writeback {
struct backing_dev_info {
struct list_head bdi_list;
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 */
congested_fn *congested_fn; /* Function pointer if device is md/dm */
void *congested_data; /* Pointer to aux data for congested func */
@@ -250,23 +250,23 @@ static inline int bdi_congested(struct backing_dev_info *bdi, int bdi_bits)
{
if (bdi->congested_fn)
return bdi->congested_fn(bdi->congested_data, bdi_bits);
- return (bdi->state & bdi_bits);
+ return (bdi->wb.state & bdi_bits);
}
static inline int bdi_read_congested(struct backing_dev_info *bdi)
{
- return bdi_congested(bdi, 1 << BDI_sync_congested);
+ return bdi_congested(bdi, 1 << WB_sync_congested);
}
static inline int bdi_write_congested(struct backing_dev_info *bdi)
{
- return bdi_congested(bdi, 1 << BDI_async_congested);
+ return bdi_congested(bdi, 1 << WB_async_congested);
}
static inline int bdi_rw_congested(struct backing_dev_info *bdi)
{
- return bdi_congested(bdi, (1 << BDI_sync_congested) |
- (1 << BDI_async_congested));
+ return bdi_congested(bdi, (1 << WB_sync_congested) |
+ (1 << WB_async_congested));
}
enum {