fs: export inode_to_bdi and use it in favor of mapping->backing_dev_info
Now that we got rid of the bdi abuse on character devices we can always use
sb->s_bdi to get at the backing_dev_info for a file, except for the block
device special case. Export inode_to_bdi and replace uses of
mapping->backing_dev_info with it to prepare for the removal of
mapping->backing_dev_info.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index e409025..835c04a 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1746,7 +1746,7 @@
mutex_lock(&inode->i_mutex);
- current->backing_dev_info = inode->i_mapping->backing_dev_info;
+ current->backing_dev_info = inode_to_bdi(inode);
err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
if (err) {
mutex_unlock(&inode->i_mutex);
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index ce74b39..905986d 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -945,7 +945,7 @@
mutex_lock(&inode->i_mutex);
/* We can write back this queue in page reclaim */
- current->backing_dev_info = file->f_mapping->backing_dev_info;
+ current->backing_dev_info = inode_to_bdi(inode);
err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
if (err)
diff --git a/fs/ext2/ialloc.c b/fs/ext2/ialloc.c
index 7d66fb0..6c14bb8 100644
--- a/fs/ext2/ialloc.c
+++ b/fs/ext2/ialloc.c
@@ -170,7 +170,7 @@
struct ext2_group_desc * gdp;
struct backing_dev_info *bdi;
- bdi = inode->i_mapping->backing_dev_info;
+ bdi = inode_to_bdi(inode);
if (bdi_read_congested(bdi))
return;
if (bdi_write_congested(bdi))
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 74c5f53..ad88e60 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -334,7 +334,7 @@
static int block_device_ejected(struct super_block *sb)
{
struct inode *bd_inode = sb->s_bdev->bd_inode;
- struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info;
+ struct backing_dev_info *bdi = inode_to_bdi(bd_inode);
return bdi->dev == NULL;
}
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index e8116a4..a20b114 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -66,7 +66,7 @@
}
EXPORT_SYMBOL(writeback_in_progress);
-static inline struct backing_dev_info *inode_to_bdi(struct inode *inode)
+struct backing_dev_info *inode_to_bdi(struct inode *inode)
{
struct super_block *sb = inode->i_sb;
#ifdef CONFIG_BLOCK
@@ -75,6 +75,7 @@
#endif
return sb->s_bdi;
}
+EXPORT_SYMBOL_GPL(inode_to_bdi);
static inline struct inode *wb_inode(struct list_head *head)
{
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 760b2c5..19d80b8 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1159,7 +1159,7 @@
mutex_lock(&inode->i_mutex);
/* We can write back this queue in page reclaim */
- current->backing_dev_info = mapping->backing_dev_info;
+ current->backing_dev_info = inode_to_bdi(inode);
err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
if (err)
@@ -1464,7 +1464,7 @@
{
struct inode *inode = req->inode;
struct fuse_inode *fi = get_fuse_inode(inode);
- struct backing_dev_info *bdi = inode->i_mapping->backing_dev_info;
+ struct backing_dev_info *bdi = inode_to_bdi(inode);
int i;
list_del(&req->writepages_entry);
@@ -1658,7 +1658,7 @@
req->end = fuse_writepage_end;
req->inode = inode;
- inc_bdi_stat(mapping->backing_dev_info, BDI_WRITEBACK);
+ inc_bdi_stat(inode_to_bdi(inode), BDI_WRITEBACK);
inc_zone_page_state(tmp_page, NR_WRITEBACK_TEMP);
spin_lock(&fc->lock);
@@ -1768,7 +1768,7 @@
if (old_req->num_pages == 1 && (old_req->state == FUSE_REQ_INIT ||
old_req->state == FUSE_REQ_PENDING)) {
- struct backing_dev_info *bdi = page->mapping->backing_dev_info;
+ struct backing_dev_info *bdi = inode_to_bdi(page->mapping->host);
copy_highpage(old_req->pages[0], page);
spin_unlock(&fc->lock);
@@ -1872,7 +1872,7 @@
req->page_descs[req->num_pages].offset = 0;
req->page_descs[req->num_pages].length = PAGE_SIZE;
- inc_bdi_stat(page->mapping->backing_dev_info, BDI_WRITEBACK);
+ inc_bdi_stat(inode_to_bdi(inode), BDI_WRITEBACK);
inc_zone_page_state(tmp_page, NR_WRITEBACK_TEMP);
err = 0;
diff --git a/fs/gfs2/aops.c b/fs/gfs2/aops.c
index 805b37f..4ad4f94 100644
--- a/fs/gfs2/aops.c
+++ b/fs/gfs2/aops.c
@@ -289,7 +289,7 @@
if (!clear_page_dirty_for_io(page))
goto continue_unlock;
- trace_wbc_writepage(wbc, mapping->backing_dev_info);
+ trace_wbc_writepage(wbc, inode_to_bdi(inode));
ret = __gfs2_jdata_writepage(page, wbc);
if (unlikely(ret)) {
diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c
index 5b327f8..1666382 100644
--- a/fs/gfs2/super.c
+++ b/fs/gfs2/super.c
@@ -743,7 +743,7 @@
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_sbd *sdp = GFS2_SB(inode);
struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl);
- struct backing_dev_info *bdi = metamapping->backing_dev_info;
+ struct backing_dev_info *bdi = inode_to_bdi(metamapping->host);
int ret = 0;
if (wbc->sync_mode == WB_SYNC_ALL)
diff --git a/fs/nfs/filelayout/filelayout.c b/fs/nfs/filelayout/filelayout.c
index 7afb52f..51aa889 100644
--- a/fs/nfs/filelayout/filelayout.c
+++ b/fs/nfs/filelayout/filelayout.c
@@ -1081,7 +1081,7 @@
spin_unlock(cinfo->lock);
if (!cinfo->dreq) {
inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
- inc_bdi_stat(page_file_mapping(req->wb_page)->backing_dev_info,
+ inc_bdi_stat(inode_to_bdi(page_file_mapping(req->wb_page)->host),
BDI_RECLAIMABLE);
__mark_inode_dirty(req->wb_context->dentry->d_inode,
I_DIRTY_DATASYNC);
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index af3af68..298abcc 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -786,7 +786,7 @@
spin_unlock(cinfo->lock);
if (!cinfo->dreq) {
inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
- inc_bdi_stat(page_file_mapping(req->wb_page)->backing_dev_info,
+ inc_bdi_stat(inode_to_bdi(page_file_mapping(req->wb_page)->host),
BDI_RECLAIMABLE);
__mark_inode_dirty(req->wb_context->dentry->d_inode,
I_DIRTY_DATASYNC);
@@ -853,7 +853,7 @@
nfs_clear_page_commit(struct page *page)
{
dec_zone_page_state(page, NR_UNSTABLE_NFS);
- dec_bdi_stat(page_file_mapping(page)->backing_dev_info, BDI_RECLAIMABLE);
+ dec_bdi_stat(inode_to_bdi(page_file_mapping(page)->host), BDI_RECLAIMABLE);
}
/* Called holding inode (/cinfo) lock */
@@ -1564,7 +1564,7 @@
nfs_mark_request_commit(req, lseg, cinfo);
if (!cinfo->dreq) {
dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
- dec_bdi_stat(page_file_mapping(req->wb_page)->backing_dev_info,
+ dec_bdi_stat(inode_to_bdi(page_file_mapping(req->wb_page)->host),
BDI_RECLAIMABLE);
}
nfs_unlock_and_release_request(req);
diff --git a/fs/ntfs/file.c b/fs/ntfs/file.c
index 643faa4..1da9b2d 100644
--- a/fs/ntfs/file.c
+++ b/fs/ntfs/file.c
@@ -19,6 +19,7 @@
* Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
+#include <linux/backing-dev.h>
#include <linux/buffer_head.h>
#include <linux/gfp.h>
#include <linux/pagemap.h>
@@ -2091,7 +2092,7 @@
count = iov_length(iov, nr_segs);
pos = *ppos;
/* We can write back this queue in page reclaim. */
- current->backing_dev_info = mapping->backing_dev_info;
+ current->backing_dev_info = inode_to_bdi(inode);
written = 0;
err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
if (err)
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index 3950693..abe7d98 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -2363,7 +2363,7 @@
goto out_dio;
}
} else {
- current->backing_dev_info = file->f_mapping->backing_dev_info;
+ current->backing_dev_info = inode_to_bdi(inode);
written = generic_perform_write(file, from, *ppos);
if (likely(written >= 0))
iocb->ki_pos = *ppos + written;
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 13e974e..5684ac3 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -699,7 +699,7 @@
iov_iter_truncate(from, count);
/* We can write back this queue in page reclaim */
- current->backing_dev_info = mapping->backing_dev_info;
+ current->backing_dev_info = inode_to_bdi(inode);
write_retry:
trace_xfs_file_buffered_write(ip, count, iocb->ki_pos, 0);