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authorJan Kara <jack@suse.cz>2012-07-03 16:45:31 +0200
committerAl Viro <viro@zeniv.linux.org.uk>2012-07-22 23:58:45 +0400
commit5c0d6b60a0ba46d45020547eacf7199171920935 (patch)
tree7d9f99cc40981dc0872e1ac33317f48b9e1f2bfb /fs/block_dev.c
parentb3de653105180b57af90ef2f5b8441f085f4ff56 (diff)
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vfs: Create function for iterating over block devices
Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/block_dev.c')
-rw-r--r--fs/block_dev.c36
1 files changed, 36 insertions, 0 deletions
diff --git a/fs/block_dev.c b/fs/block_dev.c
index c2bbe1fb1326..1e519195d45b 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1710,3 +1710,39 @@ int __invalidate_device(struct block_device *bdev, bool kill_dirty)
return res;
}
EXPORT_SYMBOL(__invalidate_device);
+
+void iterate_bdevs(void (*func)(struct block_device *, void *), void *arg)
+{
+ struct inode *inode, *old_inode = NULL;
+
+ spin_lock(&inode_sb_list_lock);
+ list_for_each_entry(inode, &blockdev_superblock->s_inodes, i_sb_list) {
+ struct address_space *mapping = inode->i_mapping;
+
+ spin_lock(&inode->i_lock);
+ if (inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW) ||
+ mapping->nrpages == 0) {
+ spin_unlock(&inode->i_lock);
+ continue;
+ }
+ __iget(inode);
+ spin_unlock(&inode->i_lock);
+ spin_unlock(&inode_sb_list_lock);
+ /*
+ * We hold a reference to 'inode' so it couldn't have been
+ * removed from s_inodes list while we dropped the
+ * inode_sb_list_lock. We cannot iput the inode now as we can
+ * be holding the last reference and we cannot iput it under
+ * inode_sb_list_lock. So we keep the reference and iput it
+ * later.
+ */
+ iput(old_inode);
+ old_inode = inode;
+
+ func(I_BDEV(inode), arg);
+
+ spin_lock(&inode_sb_list_lock);
+ }
+ spin_unlock(&inode_sb_list_lock);
+ iput(old_inode);
+}