Messages in this thread Patch in this message | | | Subject | [PATCH] don't invalidate non-directory mountpoints | From | Miklos Szeredi <> | Date | Fri, 07 Oct 2005 13:13:50 +0200 |
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d_invalidate allowed a non-directory mountpoint to be invalidated, which is bad, since the mountpoint becomes unreachable.
I know it's racy wrt attaching/detaching mount, but AFAICS so is everything else that unhashes the dentry. This seems to be an oversight when splitting out vfsmount_lock from dcache_lock. To be fixed.
Signed-off-by: Miklos Szeredi <miklos@szeredi.hu> ---
Index: linux/fs/dcache.c =================================================================== --- linux.orig/fs/dcache.c 2005-10-04 13:59:57.000000000 +0200 +++ linux/fs/dcache.c 2005-10-07 12:59:11.000000000 +0200 @@ -350,7 +350,8 @@ int d_invalidate(struct dentry * dentry) */ spin_lock(&dentry->d_lock); if (atomic_read(&dentry->d_count) > 1) { - if (dentry->d_inode && S_ISDIR(dentry->d_inode->i_mode)) { + if (dentry->d_inode && (S_ISDIR(dentry->d_inode->i_mode) || + d_mountpoint(dentry))) { spin_unlock(&dentry->d_lock); spin_unlock(&dcache_lock); return -EBUSY; - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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