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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 <haveblue@us.ibm.com>
Acked-by: Christoph Hellwig <hch@lst.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Dave Hansen
2006-09-30 23:29:03 -07:00
committed by Linus Torvalds
parent aab520e2f6
commit 9a53c3a783
28 changed files with 83 additions and 93 deletions
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2
ipc/mqueue.c
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@@ -307,7 +307,7 @@ static int mqueue_unlink(struct inode *dir, struct dentry *dentry)
dir->i_ctime = dir->i_mtime = dir->i_atime = CURRENT_TIME;
dir->i_size -= DIRENT_SIZE;
inode->i_nlink--;
drop_nlink(inode);
dput(dentry);
return 0;
}