Catch filesystems lacking s_bdi

noop_backing_dev_info is used only as a flag to mark filesystems that
don't have any backing store, like tmpfs, procfs, spufs, etc.

Signed-off-by: Joern Engel <joern@logfs.org>
Changed the BUG_ON() to a WARN_ON(). Note that adding dirty inodes
to the noop_backing_dev_info is not legal and will not result in
them being flushed, but we already catch this condition in
__mark_inode_dirty() when checking for a registered bdi.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

diff --git a/fs/super.c b/fs/super.c
index f35ac60..dc72491 100644 (file)
--- a/fs/super.c
+++ b/fs/super.c
@@ -693,6 +693,7 @@ int set_anon_super(struct super_block *s, void *data)
                return -EMFILE;
        }
        s->s_dev = MKDEV(0, dev & MINORMASK);
+       s->s_bdi = &noop_backing_dev_info;
        return 0;
 }
 
@@ -954,10 +955,11 @@ vfs_kern_mount(struct file_system_type *type, int flags, const char *name, void
        if (error < 0)
                goto out_free_secdata;
        BUG_ON(!mnt->mnt_sb);
+       WARN_ON(!mnt->mnt_sb->s_bdi);
 
-       error = security_sb_kern_mount(mnt->mnt_sb, flags, secdata);
-       if (error)
-               goto out_sb;
+       error = security_sb_kern_mount(mnt->mnt_sb, flags, secdata);
+       if (error)
+               goto out_sb;
 
        /*
         * filesystems should never set s_maxbytes larger than MAX_LFS_FILESIZE

diff --git a/fs/sync.c b/fs/sync.c
index fc5c3d7..92b2281 100644 (file)
--- a/fs/sync.c
+++ b/fs/sync.c
@@ -14,6 +14,7 @@
 #include <linux/pagemap.h>
 #include <linux/quotaops.h>
 #include <linux/buffer_head.h>
+#include <linux/backing-dev.h>
 #include "internal.h"
 
 #define VALID_FLAGS (SYNC_FILE_RANGE_WAIT_BEFORE|SYNC_FILE_RANGE_WRITE| \
@@ -32,7 +33,7 @@ static int __sync_filesystem(struct super_block *sb, int wait)
         * This should be safe, as we require bdi backing to actually
         * write out data in the first place
         */
-       if (!sb->s_bdi)
+       if (!sb->s_bdi || sb->s_bdi == &noop_backing_dev_info)
                return 0;
 
        if (sb->s_qcop && sb->s_qcop->quota_sync)

diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h
index e19c677..bd0e3c6 100644 (file)
--- a/include/linux/backing-dev.h
+++ b/include/linux/backing-dev.h
@@ -247,6 +247,7 @@ int bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ratio);
 #endif
 
 extern struct backing_dev_info default_backing_dev_info;
+extern struct backing_dev_info noop_backing_dev_info;
 void default_unplug_io_fn(struct backing_dev_info *bdi, struct page *page);
 
 int writeback_in_progress(struct backing_dev_info *bdi);

diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index dbda470..707d0dc 100644 (file)
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -27,6 +27,11 @@ struct backing_dev_info default_backing_dev_info = {
 };
 EXPORT_SYMBOL_GPL(default_backing_dev_info);
 
+struct backing_dev_info noop_backing_dev_info = {
+       .name           = "noop",
+};
+EXPORT_SYMBOL_GPL(noop_backing_dev_info);
+
 static struct class *bdi_class;
 
 /*