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-rw-r--r--fs/file_table.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/fs/file_table.c b/fs/file_table.c
index 3f73eb1..71efc70 100644
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -199,6 +199,17 @@ int init_file(struct file *file, struct vfsmount *mnt, struct dentry *dentry,
file->f_mapping = dentry->d_inode->i_mapping;
file->f_mode = mode;
file->f_op = fop;
+
+ /*
+ * These mounts don't really matter in practice
+ * for r/o bind mounts. They aren't userspace-
+ * visible. We do this for consistency, and so
+ * that we can do debugging checks at __fput()
+ */
+ if ((mode & FMODE_WRITE) && !special_file(dentry->d_inode->i_mode)) {
+ error = mnt_want_write(mnt);
+ WARN_ON(error);
+ }
return error;
}
EXPORT_SYMBOL(init_file);
@@ -221,10 +232,13 @@ EXPORT_SYMBOL(fput);
*/
void drop_file_write_access(struct file *file)
{
+ struct vfsmount *mnt = file->f_path.mnt;
struct dentry *dentry = file->f_path.dentry;
struct inode *inode = dentry->d_inode;
put_write_access(inode);
+ if (!special_file(inode->i_mode))
+ mnt_drop_write(mnt);
}
EXPORT_SYMBOL_GPL(drop_file_write_access);
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