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[PATCH] r/o bind mounts: unlink: monitor i_nlink

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When a filesystem decrements i_nlink to zero, it means that a write must be
performed in order to drop the inode from the filesystem.

We're shortly going to have keep filesystems from being remounted r/o between
the time that this i_nlink decrement and that write occurs.

So, add a little helper function to do the decrements.  We'll tie into it in a
bit to note when i_nlink hits zero.

Signed-off-by: Dave Hansen <[email protected]>
Acked-by: Christoph Hellwig <[email protected]>
Cc: Al Viro <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Dave Hansen 2006-09-30 23:29:03 -07:00 • committed by Linus Torvalds
commit 9a53c3a783
28 changed files with 83 additions and 93 deletions
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6
fs/hpfs/namei.c
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@ -434,7 +434,7 @@ again:
unlock_kernel();
return -ENOSPC;
default:
inode->i_nlink--;
drop_nlink(inode);
err = 0;
}
goto out;
@ -494,7 +494,7 @@ static int hpfs_rmdir(struct inode *dir, struct dentry *dentry)
err = -ENOSPC;
break;
default:
dir->i_nlink--;
drop_nlink(dir);
inode->i_nlink = 0;
err = 0;
}
@ -636,7 +636,7 @@ static int hpfs_rename(struct inode *old_dir, struct dentry *old_dentry,
hpfs_i(i)->i_parent_dir = new_dir->i_ino;
if (S_ISDIR(i->i_mode)) {
new_dir->i_nlink++;
old_dir->i_nlink--;
drop_nlink(old_dir);
}
if ((fnode = hpfs_map_fnode(i->i_sb, i->i_ino, &bh))) {
fnode->up = new_dir->i_ino;