#ifndef _UDF_I_H
#define _UDF_I_H

struct extent_position {
	struct buffer_head *bh;
	uint32_t offset;
	struct kernel_lb_addr block;
};

struct udf_ext_cache {
	/* Extent position */
	struct extent_position epos;
	/* Start logical offset in bytes */
	loff_t lstart;
};

/*
 * The i_data_sem and i_mutex serve for protection of allocation information
 * of a regular files and symlinks. This includes all extents belonging to
 * the file/symlink, a fact whether data are in-inode or in external data
 * blocks, preallocation, goal block information... When extents are read,
 * i_mutex or i_data_sem must be held (for reading is enough in case of
 * i_data_sem). When extents are changed, i_data_sem must be held for writing
 * and also i_mutex must be held.
 *
 * For directories i_mutex is used for all the necessary protection.
 */

struct udf_inode_info {
	struct timespec		i_crtime;
	/* Physical address of inode */
	struct kernel_lb_addr		i_location;
	__u64			i_unique;
	__u32			i_lenEAttr;
	__u32			i_lenAlloc;
	__u64			i_lenExtents;
	__u32			i_next_alloc_block;
	__u32			i_next_alloc_goal;
	__u32			i_checkpoint;
	unsigned		i_alloc_type : 3;
	unsigned		i_efe : 1;	/* extendedFileEntry */
	unsigned		i_use : 1;	/* unallocSpaceEntry */
	unsigned		i_strat4096 : 1;
	unsigned		reserved : 26;
	union {
		struct short_ad	*i_sad;
		struct long_ad		*i_lad;
		__u8		*i_data;
	} i_ext;
	struct rw_semaphore	i_data_sem;
	struct udf_ext_cache cached_extent;
	/* Spinlock for protecting extent cache */
	spinlock_t i_extent_cache_lock;
	struct inode vfs_inode;
};

static inline struct udf_inode_info *UDF_I(struct inode *inode)
{
	return container_of(inode, struct udf_inode_info, vfs_inode);
}

#endif /* _UDF_I_H) */
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<tr class='logheader'><td><span title='2017-01-31 13:16:59 -0500'>2017-01-31</span></td><td class='logsubject'><a href='/cgit.cgi/linux/net-next.git/commit/include/net/ipv6.h?id=90427ef5d2a4b9a24079889bf16afdcdaebc4240'>ipv6: fix flow labels when the traffic class is non-0</a></td><td>Dimitris Michailidis</td><td>1</td><td><span class='deletions'>-0</span>/<span class='insertions'>+5</span></td></tr>
<tr class='nohover-highlight'><td/><td colspan='5' class='logmsg'>
ip6_make_flowlabel() determines the flow label for IPv6 packets. It's
supposed to be passed a flow label, which it returns as is if non-0 and
in some other cases, otherwise it calculates a new value.

The problem is callers often pass a flowi6.flowlabel, which may also
contain traffic class bits. If the traffic class is non-0
ip6_make_flowlabel() mistakes the non-0 it gets as a flow label and
returns the whole thing. Thus it can return a 'flow label' longer than
20b and the low 20b of that is typically 0 resulting in packets with 0
label. Moreover, different packets of a flow may be labeled differently.
For a TCP flow with ECN non-payload and payload packets get different
labels as exemplified by this pair of consecutive packets:

(pure ACK)
Internet Protocol Version 6, Src: 2002:af5:11a3::, Dst: 2002:af5:11a2::
    0110 .... = Version: 6
    .... 0000 0000 .... .... .... .... .... = Traffic Class: 0x00 (DSCP: CS0, ECN: Not-ECT)
        .... 0000 00.. .... .... .... .... .... = Differentiated Services Codepoint: Default (0)
        .... .... ..00 .... .... .... .... .... = Explicit Congestion Notification: Not ECN-Capable Transport (0)
    .... .... .... 0001 1100 1110 0100 1001 = Flow Label: 0x1ce49
    Payload Length: 32
    Next Header: TCP (6)

(payload)
Internet Protocol Version 6, Src: 2002:af5:11a3::, Dst: 2002:af5:11a2::
    0110 .... = Version: 6
    .... 0000 0010 .... .... .... .... .... = Traffic Class: 0x02 (DSCP: CS0, ECN: ECT(0))
        .... 0000 00.. .... .... .... .... .... = Differentiated Services Codepoint: Default (0)
        .... .... ..10 .... .... .... .... .... = Explicit Congestion Notification: ECN-Capable Transport codepoint '10' (2)
    .... .... .... 0000 0000 0000 0000 0000 = Flow Label: 0x00000
    Payload Length: 688
    Next Header: TCP (6)

This patch allows ip6_make_flowlabel() to be passed more than just a
flow label and has it extract the part it really wants. This was simpler
than modifying the callers. With this patch packets like the above become

Internet Protocol Version 6, Src: 2002:af5:11a3::, Dst: 2002:af5:11a2::
    0110 .... = Version: 6
    .... 0000 0000 .... .... .... .... .... = Traffic Class: 0x00 (DSCP: CS0, ECN: Not-ECT)
        .... 0000 00.. .... .... .... .... .... = Differentiated Services Codepoint: Default (0)
        .... .... ..00 .... .... .... .... .... = Explicit Congestion Notification: Not ECN-Capable Transport (0)
    .... .... .... 1010 1111 1010 0101 1110 = Flow Label: 0xafa5e
    Payload Length: 32
    Next Header: TCP (6)

Internet Protocol Version 6, Src: 2002:af5:11a3::, Dst: 2002:af5:11a2::
    0110 .... = Version: 6
    .... 0000 0010 .... .... .... .... .... = Traffic Class: 0x02 (DSCP: CS0, ECN: ECT(0))
        .... 0000 00.. .... .... .... .... .... = Differentiated Services Codepoint: Default (0)
        .... .... ..10 .... .... .... .... .... = Explicit Congestion Notification: ECN-Capable Transport codepoint '10' (2)
    .... .... .... 1010 1111 1010 0101 1110 = Flow Label: 0xafa5e
    Payload Length: 688
    Next Header: TCP (6)

Signed-off-by: Dimitris Michailidis &lt;dmichail@google.com&gt;
Acked-by: Eric Dumazet &lt;edumazet@google.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;


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