[Ocfs2-devel] [PATCH] ocfs2: Use xs->bucket to set xattr value outside.
tristan.ye
tristan.ye at oracle.com
Wed Mar 11 19:28:50 PDT 2009
On Tue, 2009-03-10 at 07:49 +0800, Tao Ma wrote:
> Tristan,
> could you please run your xattr test against it?
Awesome! All single&multi-nodes xattr tests passed!
For detail testing info, refer to:
http://oss.oracle.com/osswiki/OCFS2/XattrTest
Regards,
Tristan
>
> xs->base used to be allocated a 4K size and all the contents in the
> bucket are copied to the it. So in ocfs2_xattr_bucket_set_value_outside,
> we are safe to use xs->base + offset. Now we use ocfs2_xattr_bucket to
> abstract xattr bucket and xs->base is initialized to the start of the
> bu_bhs[0]. So xs->base + offset will overflow when the value root is
> stored outside the first block.
>
> Then why we can survive the xattr test by now? It is because we always
> read the bucket contiguously now and kernel mm allocate continguous
> memory for us. We are lucky, but we should fix it. So just get the
> right value root as other callers do.
>
> Signed-off-by: Tao Ma <tao.ma at oracle.com>
> ---
> fs/ocfs2/xattr.c | 27 +++++++++++++++++++++------
> 1 files changed, 21 insertions(+), 6 deletions(-)
>
> diff --git a/fs/ocfs2/xattr.c b/fs/ocfs2/xattr.c
> index f1b9af1..503a1d7 100644
> --- a/fs/ocfs2/xattr.c
> +++ b/fs/ocfs2/xattr.c
> @@ -4795,19 +4795,34 @@ static int ocfs2_xattr_bucket_set_value_outside(struct inode *inode,
> char *val,
> int value_len)
> {
> - int offset;
> + int ret, offset, block_off;
> struct ocfs2_xattr_value_root *xv;
> struct ocfs2_xattr_entry *xe = xs->here;
> + struct ocfs2_xattr_bucket *bucket = xs->bucket;
> + struct ocfs2_xattr_header *xh = bucket_xh(bucket);
> + void *base;
>
> BUG_ON(!xs->base || !xe || ocfs2_xattr_is_local(xe));
>
> - offset = le16_to_cpu(xe->xe_name_offset) +
> - OCFS2_XATTR_SIZE(xe->xe_name_len);
> + ret = ocfs2_xattr_bucket_get_name_value(inode, xh,
> + xe - xh->xh_entries,
> + &block_off,
> + &offset);
> + if (ret) {
> + mlog_errno(ret);
> + goto out;
> + }
>
> - xv = (struct ocfs2_xattr_value_root *)(xs->base + offset);
> + base = bucket_block(xs->bucket, block_off);
> + xv = (struct ocfs2_xattr_value_root *)(base + offset +
> + OCFS2_XATTR_SIZE(xe->xe_name_len));
>
> - return __ocfs2_xattr_set_value_outside(inode, handle,
> - xv, val, value_len);
> + ret = __ocfs2_xattr_set_value_outside(inode, handle,
> + xv, val, value_len);
> + if (ret)
> + mlog_errno(ret);
> +out:
> + return ret;
> }
>
> static int ocfs2_rm_xattr_cluster(struct inode *inode,
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