[patch] Reimplementation of fs_may_remount_ro in 2.1.47

Andreas Schwab (schwab@issan.informatik.uni-dortmund.de)
Fri, 1 Aug 97 10:54:15 +0200

This patch reimplements the function fs_may_remount_ro. Actually it is
pretty much identical to the previous implementation, except for
s/f_inode/f_dentry->d_inode/. As before, this function should be moved to
file_table.c.

--- linux-2.1.47/fs/inode.c.~1~ Mon Jul 28 17:29:46 1997
+++ linux-2.1.47/fs/inode.c Sat Jul 26 13:30:25 1997
@@ -504,7 +504,22 @@
return root->d_count == 1;
}

+/* This belongs in file_table.c, not here... */
int fs_may_remount_ro(struct super_block *sb)
{
- return 1;
+ struct file *file;
+ kdev_t dev = sb->s_dev;
+
+ /* Check that no files are currently opened for writing. */
+ for (file = inuse_filps; file; file = file->f_next) {
+ struct inode *inode;
+ if (!file->f_dentry)
+ continue;
+ inode = file->f_dentry->d_inode;
+ if (!inode || inode->i_dev != dev)
+ continue;
+ if (S_ISREG(inode->i_mode) && file->f_mode & FMODE_WRITE)
+ return 0;
+ }
+ return 1; /* Tis' cool bro. */
}

-- 
Andreas Schwab                                      "And now for something
schwab@issan.informatik.uni-dortmund.de              completely different"