vfs: prevent remount read-only if pending removes

If there are any inodes on the super block that have been unlinked
(i_nlink == 0) but have not yet been deleted then prevent the
remounting the super block read-only.

Reported-by: Toshiyuki Okajima <toshi.okajima@jp.fujitsu.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Tested-by: Toshiyuki Okajima <toshi.okajima@jp.fujitsu.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 0 insertions, 23 deletions

diff --git a/fs/file_table.c b/fs/file_table.c
index c322794f7360..20002e39754d 100644
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -474,29 +474,6 @@ void file_sb_list_del(struct file *file)
 
 #endif
 
-int fs_may_remount_ro(struct super_block *sb)
-{
-        struct file *file;
-        /* Check that no files are currently opened for writing. */
-        lg_global_lock(files_lglock);
-        do_file_list_for_each_entry(sb, file) {
-                struct inode *inode = file->f_path.dentry->d_inode;
-
-                /* File with pending delete? */
-                if (inode->i_nlink == 0)
-                        goto too_bad;
-
-                /* Writeable file? */
-                if (S_ISREG(inode->i_mode) && (file->f_mode & FMODE_WRITE))
-                        goto too_bad;
-        } while_file_list_for_each_entry;
-        lg_global_unlock(files_lglock);
-        return 1; /* Tis' cool bro. */
-too_bad:
-        lg_global_unlock(files_lglock);
-        return 0;
-}
-
 /**
  *      mark_files_ro - mark all files read-only
  *      @sb: superblock in question