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authorTejun Heo <tj@kernel.org>2015-05-22 17:13:27 -0400
committerJens Axboe <axboe@fb.com>2015-06-02 08:33:34 -0600
commit93f78d882865cb90020d0f80a9523c99cf46924c (patch)
tree6cd9c3531085c7d51fbd6ec2086142255bc2c219 /fs
parent4452226ea276e74fc3e252c88d9bb7e8f8e44bf0 (diff)
writeback: move backing_dev_info->bdi_stat[] 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->bdi_stat[] into wb. * enum bdi_stat_item is renamed to wb_stat_item and the prefix of all enums is changed from BDI_ to WB_. * BDI_STAT_BATCH() -> WB_STAT_BATCH() * [__]{add|inc|dec|sum}_wb_stat(bdi, ...) -> [__]{add|inc}_wb_stat(wb, ...) * bdi_stat[_error]() -> wb_stat[_error]() * bdi_writeout_inc() -> wb_writeout_inc() * stat init is moved to bdi_wb_init() and bdi_wb_exit() is added and frees stat. * As there's still only one bdi_writeback per backing_dev_info, all uses of bdi->stat[] are mechanically replaced with bdi->wb.stat[] 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: Miklos Szeredi <miklos@szeredi.hu> Cc: Trond Myklebust <trond.myklebust@primarydata.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/fs-writeback.c2
-rw-r--r--fs/fuse/file.c12
-rw-r--r--fs/nfs/internal.h2
-rw-r--r--fs/nfs/write.c3
4 files changed, 10 insertions, 9 deletions
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 983312cea245..8873ecd1578c 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -840,7 +840,7 @@ static bool over_bground_thresh(struct backing_dev_info *bdi)
global_page_state(NR_UNSTABLE_NFS) > background_thresh)
return true;
- if (bdi_stat(bdi, BDI_RECLAIMABLE) >
+ if (wb_stat(&bdi->wb, WB_RECLAIMABLE) >
bdi_dirty_limit(bdi, background_thresh))
return true;
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 5ef05b5c4cff..8c5e2fa68835 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1445,9 +1445,9 @@ static void fuse_writepage_finish(struct fuse_conn *fc, struct fuse_req *req)
list_del(&req->writepages_entry);
for (i = 0; i < req->num_pages; i++) {
- dec_bdi_stat(bdi, BDI_WRITEBACK);
+ dec_wb_stat(&bdi->wb, WB_WRITEBACK);
dec_zone_page_state(req->pages[i], NR_WRITEBACK_TEMP);
- bdi_writeout_inc(bdi);
+ wb_writeout_inc(&bdi->wb);
}
wake_up(&fi->page_waitq);
}
@@ -1634,7 +1634,7 @@ static int fuse_writepage_locked(struct page *page)
req->end = fuse_writepage_end;
req->inode = inode;
- inc_bdi_stat(inode_to_bdi(inode), BDI_WRITEBACK);
+ inc_wb_stat(&inode_to_bdi(inode)->wb, WB_WRITEBACK);
inc_zone_page_state(tmp_page, NR_WRITEBACK_TEMP);
spin_lock(&fc->lock);
@@ -1749,9 +1749,9 @@ static bool fuse_writepage_in_flight(struct fuse_req *new_req,
copy_highpage(old_req->pages[0], page);
spin_unlock(&fc->lock);
- dec_bdi_stat(bdi, BDI_WRITEBACK);
+ dec_wb_stat(&bdi->wb, WB_WRITEBACK);
dec_zone_page_state(page, NR_WRITEBACK_TEMP);
- bdi_writeout_inc(bdi);
+ wb_writeout_inc(&bdi->wb);
fuse_writepage_free(fc, new_req);
fuse_request_free(new_req);
goto out;
@@ -1848,7 +1848,7 @@ static int fuse_writepages_fill(struct page *page,
req->page_descs[req->num_pages].offset = 0;
req->page_descs[req->num_pages].length = PAGE_SIZE;
- inc_bdi_stat(inode_to_bdi(inode), BDI_WRITEBACK);
+ inc_wb_stat(&inode_to_bdi(inode)->wb, WB_WRITEBACK);
inc_zone_page_state(tmp_page, NR_WRITEBACK_TEMP);
err = 0;
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index 9e6475bc5ba2..7e3c4604bea8 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -607,7 +607,7 @@ void nfs_mark_page_unstable(struct page *page)
struct inode *inode = page_file_mapping(page)->host;
inc_zone_page_state(page, NR_UNSTABLE_NFS);
- inc_bdi_stat(inode_to_bdi(inode), BDI_RECLAIMABLE);
+ inc_wb_stat(&inode_to_bdi(inode)->wb, WB_RECLAIMABLE);
__mark_inode_dirty(inode, I_DIRTY_DATASYNC);
}
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index d12a4be613a5..94c7ce01dfb1 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -853,7 +853,8 @@ static void
nfs_clear_page_commit(struct page *page)
{
dec_zone_page_state(page, NR_UNSTABLE_NFS);
- dec_bdi_stat(inode_to_bdi(page_file_mapping(page)->host), BDI_RECLAIMABLE);
+ dec_wb_stat(&inode_to_bdi(page_file_mapping(page)->host)->wb,
+ WB_RECLAIMABLE);
}
/* Called holding inode (/cinfo) lock */