Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted

Pull networking updates from Jakub Kicinski:
 "Core:

   - Add dedicated kmem_cache for typical/small skb->head, avoid having
     to access struct page at kfree time, and improve memory use.

   - Introduce sysctl to set default RPS configuration for new netdevs.

   - Define Netlink protocol specification format which can be used to
     describe messages used by each family and auto-generate parsers.
     Add tools for generating kernel data structures and uAPI headers.

   - Expose all net/core sysctls inside netns.

   - Remove 4s sleep in netpoll if carrier is instantly detected on
     boot.

   - Add configurable limit of MDB entries per port, and port-vlan.

   - Continue populating drop reasons throughout the stack.

   - Retire a handful of legacy Qdiscs and classifiers.

  Protocols:

   - Support IPv4 big TCP (TSO frames larger than 64kB).

   - Add IP_LOCAL_PORT_RANGE socket option, to control local port range
     on socket by socket basis.

   - Track and report in procfs number of MPTCP sockets used.

   - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
     manager.

   - IPv6: don't check net.ipv6.route.max_size and rely on garbage
     collection to free memory (similarly to IPv4).

   - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).

   - ICMP: add per-rate limit counters.

   - Add support for user scanning requests in ieee802154.

   - Remove static WEP support.

   - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
     reporting.

   - WiFi 7 EHT channel puncturing support (client & AP).

  BPF:

   - Add a rbtree data structure following the "next-gen data structure"
     precedent set by recently added linked list, that is, by using
     kfunc + kptr instead of adding a new BPF map type.

   - Expose XDP hints via kfuncs with initial support for RX hash and
     timestamp metadata.

   - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
     better support decap on GRE tunnel devices not operating in collect
     metadata.

   - Improve x86 JIT's codegen for PROBE_MEM runtime error checks.

   - Remove the need for trace_printk_lock for bpf_trace_printk and
     bpf_trace_vprintk helpers.

   - Extend libbpf's bpf_tracing.h support for tracing arguments of
     kprobes/uprobes and syscall as a special case.

   - Significantly reduce the search time for module symbols by
     livepatch and BPF.

   - Enable cpumasks to be used as kptrs, which is useful for tracing
     programs tracking which tasks end up running on which CPUs in
     different time intervals.

   - Add support for BPF trampoline on s390x and riscv64.

   - Add capability to export the XDP features supported by the NIC.

   - Add __bpf_kfunc tag for marking kernel functions as kfuncs.

   - Add cgroup.memory=nobpf kernel parameter option to disable BPF
     memory accounting for container environments.

  Netfilter:

   - Remove the CLUSTERIP target. It has been marked as obsolete for
     years, and we still have WARN splats wrt races of the out-of-band
     /proc interface installed by this target.

   - Add 'destroy' commands to nf_tables. They are identical to the
     existing 'delete' commands, but do not return an error if the
     referenced object (set, chain, rule...) did not exist.

  Driver API:

   - Improve cpumask_local_spread() locality to help NICs set the right
     IRQ affinity on AMD platforms.

   - Separate C22 and C45 MDIO bus transactions more clearly.

   - Introduce new DCB table to control DSCP rewrite on egress.

   - Support configuration of Physical Layer Collision Avoidance (PLCA)
     Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
     shared medium Ethernet.

   - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
     preemption of low priority frames by high priority frames.

   - Add support for controlling MACSec offload using netlink SET.

   - Rework devlink instance refcounts to allow registration and
     de-registration under the instance lock. Split the code into
     multiple files, drop some of the unnecessarily granular locks and
     factor out common parts of netlink operation handling.

   - Add TX frame aggregation parameters (for USB drivers).

   - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
     messages with notifications for debug.

   - Allow offloading of UDP NEW connections via act_ct.

   - Add support for per action HW stats in TC.

   - Support hardware miss to TC action (continue processing in SW from
     a specific point in the action chain).

   - Warn if old Wireless Extension user space interface is used with
     modern cfg80211/mac80211 drivers. Do not support Wireless
     Extensions for Wi-Fi 7 devices at all. Everyone should switch to
     using nl80211 interface instead.

   - Improve the CAN bit timing configuration. Use extack to return
     error messages directly to user space, update the SJW handling,
     including the definition of a new default value that will benefit
     CAN-FD controllers, by increasing their oscillator tolerance.

  New hardware / drivers:

   - Ethernet:
      - nVidia BlueField-3 support (control traffic driver)
      - Ethernet support for imx93 SoCs
      - Motorcomm yt8531 gigabit Ethernet PHY
      - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
      - Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
      - Amlogic gxl MDIO mux

   - WiFi:
      - RealTek RTL8188EU (rtl8xxxu)
      - Qualcomm Wi-Fi 7 devices (ath12k)

   - CAN:
      - Renesas R-Car V4H

  Drivers:

   - Bluetooth:
      - Set Per Platform Antenna Gain (PPAG) for Intel controllers.

   - Ethernet NICs:
      - Intel (1G, igc):
         - support TSN / Qbv / packet scheduling features of i226 model
      - Intel (100G, ice):
         - use GNSS subsystem instead of TTY
         - multi-buffer XDP support
         - extend support for GPIO pins to E823 devices
      - nVidia/Mellanox:
         - update the shared buffer configuration on PFC commands
         - implement PTP adjphase function for HW offset control
         - TC support for Geneve and GRE with VF tunnel offload
         - more efficient crypto key management method
         - multi-port eswitch support
      - Netronome/Corigine:
         - add DCB IEEE support
         - support IPsec offloading for NFP3800
      - Freescale/NXP (enetc):
         - support XDP_REDIRECT for XDP non-linear buffers
         - improve reconfig, avoid link flap and waiting for idle
         - support MAC Merge layer
      - Other NICs:
         - sfc/ef100: add basic devlink support for ef100
         - ionic: rx_push mode operation (writing descriptors via MMIO)
         - bnxt: use the auxiliary bus abstraction for RDMA
         - r8169: disable ASPM and reset bus in case of tx timeout
         - cpsw: support QSGMII mode for J721e CPSW9G
         - cpts: support pulse-per-second output
         - ngbe: add an mdio bus driver
         - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
         - r8152: handle devices with FW with NCM support
         - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
         - virtio-net: support multi buffer XDP
         - virtio/vsock: replace virtio_vsock_pkt with sk_buff
         - tsnep: XDP support

   - Ethernet high-speed switches:
      - nVidia/Mellanox (mlxsw):
         - add support for latency TLV (in FW control messages)
      - Microchip (sparx5):
         - separate explicit and implicit traffic forwarding rules, make
           the implicit rules always active
         - add support for egress DSCP rewrite
         - IS0 VCAP support (Ingress Classification)
         - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
           etc.)
         - ES2 VCAP support (Egress Access Control)
         - support for Per-Stream Filtering and Policing (802.1Q,
           8.6.5.1)

   - Ethernet embedded switches:
      - Marvell (mv88e6xxx):
         - add MAB (port auth) offload support
         - enable PTP receive for mv88e6390
      - NXP (ocelot):
         - support MAC Merge layer
         - support for the the vsc7512 internal copper phys
      - Microchip:
         - lan9303: convert to PHYLINK
         - lan966x: support TC flower filter statistics
         - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
         - lan937x: support Credit Based Shaper configuration
         - ksz9477: support Energy Efficient Ethernet
      - other:
         - qca8k: convert to regmap read/write API, use bulk operations
         - rswitch: Improve TX timestamp accuracy

   - Intel WiFi (iwlwifi):
      - EHT (Wi-Fi 7) rate reporting
      - STEP equalizer support: transfer some STEP (connection to radio
        on platforms with integrated wifi) related parameters from the
        BIOS to the firmware.

   - Qualcomm 802.11ax WiFi (ath11k):
      - IPQ5018 support
      - Fine Timing Measurement (FTM) responder role support
      - channel 177 support

   - MediaTek WiFi (mt76):
      - per-PHY LED support
      - mt7996: EHT (Wi-Fi 7) support
      - Wireless Ethernet Dispatch (WED) reset support
      - switch to using page pool allocator

   - RealTek WiFi (rtw89):
      - support new version of Bluetooth co-existance

   - Mobile:
      - rmnet: support TX aggregation"

* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
  page_pool: add a comment explaining the fragment counter usage
  net: ethtool: fix __ethtool_dev_mm_supported() implementation
  ethtool: pse-pd: Fix double word in comments
  xsk: add linux/vmalloc.h to xsk.c
  sefltests: netdevsim: wait for devlink instance after netns removal
  selftest: fib_tests: Always cleanup before exit
  net/mlx5e: Align IPsec ASO result memory to be as required by hardware
  net/mlx5e: TC, Set CT miss to the specific ct action instance
  net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
  net/mlx5: Refactor tc miss handling to a single function
  net/mlx5: Kconfig: Make tc offload depend on tc skb extension
  net/sched: flower: Support hardware miss to tc action
  net/sched: flower: Move filter handle initialization earlier
  net/sched: cls_api: Support hardware miss to tc action
  net/sched: Rename user cookie and act cookie
  sfc: fix builds without CONFIG_RTC_LIB
  sfc: clean up some inconsistent indentings
  net/mlx4_en: Introduce flexible array to silence overflow warning
  net: lan966x: Fix possible deadlock inside PTP
  net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
  ...

1 files changed, 561 insertions, 0 deletions

diff --git a/fs/hpfs/hpfs.h b/fs/hpfs/hpfs.h
new file mode 100644
index 000000000..281dec8f6
--- /dev/null
+++ b/fs/hpfs/hpfs.h
@@ -0,0 +1,561 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ *  linux/fs/hpfs/hpfs.h
+ *
+ *  HPFS structures by Chris Smith, 1993
+ *
+ *  a little bit modified by Mikulas Patocka, 1998-1999
+ */
+
+/* The paper
+
+     Duncan, Roy
+     Design goals and implementation of the new High Performance File System
+     Microsoft Systems Journal  Sept 1989  v4 n5 p1(13)
+
+   describes what HPFS looked like when it was new, and it is the source
+   of most of the information given here.  The rest is conjecture.
+
+   For definitive information on the Duncan paper, see it, not this file.
+   For definitive information on HPFS, ask somebody else -- this is guesswork.
+   There are certain to be many mistakes. */
+
+#if !defined(__LITTLE_ENDIAN) && !defined(__BIG_ENDIAN)
+#error unknown endian
+#endif
+
+/* Notation */
+
+typedef u32 secno;			/* sector number, partition relative */
+
+typedef secno dnode_secno;		/* sector number of a dnode */
+typedef secno fnode_secno;		/* sector number of an fnode */
+typedef secno anode_secno;		/* sector number of an anode */
+
+typedef u32 time32_t;		/* 32-bit time_t type */
+
+/* sector 0 */
+
+/* The boot block is very like a FAT boot block, except that the
+   29h signature byte is 28h instead, and the ID string is "HPFS". */
+
+#define BB_MAGIC 0xaa55
+
+struct hpfs_boot_block
+{
+  u8 jmp[3];
+  u8 oem_id[8];
+  u8 bytes_per_sector[2];	/* 512 */
+  u8 sectors_per_cluster;
+  u8 n_reserved_sectors[2];
+  u8 n_fats;
+  u8 n_rootdir_entries[2];
+  u8 n_sectors_s[2];
+  u8 media_byte;
+  __le16 sectors_per_fat;
+  __le16 sectors_per_track;
+  __le16 heads_per_cyl;
+  __le32 n_hidden_sectors;
+  __le32 n_sectors_l;		/* size of partition */
+  u8 drive_number;
+  u8 mbz;
+  u8 sig_28h;			/* 28h */
+  u8 vol_serno[4];
+  u8 vol_label[11];
+  u8 sig_hpfs[8];		/* "HPFS    " */
+  u8 pad[448];
+  __le16 magic;			/* aa55 */
+};
+
+
+/* sector 16 */
+
+/* The super block has the pointer to the root directory. */
+
+#define SB_MAGIC 0xf995e849
+
+struct hpfs_super_block
+{
+  __le32 magic;				/* f995 e849 */
+  __le32 magic1;			/* fa53 e9c5, more magic? */
+  u8 version;				/* version of a filesystem  usually 2 */
+  u8 funcversion;			/* functional version - oldest version
+  					   of filesystem that can understand
+					   this disk */
+  __le16 zero;				/* 0 */
+  __le32 root;				/* fnode of root directory */
+  __le32 n_sectors;			/* size of filesystem */
+  __le32 n_badblocks;			/* number of bad blocks */
+  __le32 bitmaps;			/* pointers to free space bit maps */
+  __le32 zero1;				/* 0 */
+  __le32 badblocks;			/* bad block list */
+  __le32 zero3;				/* 0 */
+  __le32 last_chkdsk;			/* date last checked, 0 if never */
+  __le32 last_optimize;			/* date last optimized, 0 if never */
+  __le32 n_dir_band;			/* number of sectors in dir band */
+  __le32 dir_band_start;			/* first sector in dir band */
+  __le32 dir_band_end;			/* last sector in dir band */
+  __le32 dir_band_bitmap;		/* free space map, 1 dnode per bit */
+  u8 volume_name[32];			/* not used */
+  __le32 user_id_table;			/* 8 preallocated sectors - user id */
+  u32 zero6[103];			/* 0 */
+};
+
+
+/* sector 17 */
+
+/* The spare block has pointers to spare sectors.  */
+
+#define SP_MAGIC 0xf9911849
+
+struct hpfs_spare_block
+{
+  __le32 magic;				/* f991 1849 */
+  __le32 magic1;				/* fa52 29c5, more magic? */
+
+#ifdef __LITTLE_ENDIAN
+  u8 dirty: 1;				/* 0 clean, 1 "improperly stopped" */
+  u8 sparedir_used: 1;			/* spare dirblks used */
+  u8 hotfixes_used: 1;			/* hotfixes used */
+  u8 bad_sector: 1;			/* bad sector, corrupted disk (???) */
+  u8 bad_bitmap: 1;			/* bad bitmap */
+  u8 fast: 1;				/* partition was fast formatted */
+  u8 old_wrote: 1;			/* old version wrote to partition */
+  u8 old_wrote_1: 1;			/* old version wrote to partition (?) */
+#else
+  u8 old_wrote_1: 1;			/* old version wrote to partition (?) */
+  u8 old_wrote: 1;			/* old version wrote to partition */
+  u8 fast: 1;				/* partition was fast formatted */
+  u8 bad_bitmap: 1;			/* bad bitmap */
+  u8 bad_sector: 1;			/* bad sector, corrupted disk (???) */
+  u8 hotfixes_used: 1;			/* hotfixes used */
+  u8 sparedir_used: 1;			/* spare dirblks used */
+  u8 dirty: 1;				/* 0 clean, 1 "improperly stopped" */
+#endif
+
+#ifdef __LITTLE_ENDIAN
+  u8 install_dasd_limits: 1;		/* HPFS386 flags */
+  u8 resynch_dasd_limits: 1;
+  u8 dasd_limits_operational: 1;
+  u8 multimedia_active: 1;
+  u8 dce_acls_active: 1;
+  u8 dasd_limits_dirty: 1;
+  u8 flag67: 2;
+#else
+  u8 flag67: 2;
+  u8 dasd_limits_dirty: 1;
+  u8 dce_acls_active: 1;
+  u8 multimedia_active: 1;
+  u8 dasd_limits_operational: 1;
+  u8 resynch_dasd_limits: 1;
+  u8 install_dasd_limits: 1;		/* HPFS386 flags */
+#endif
+
+  u8 mm_contlgulty;
+  u8 unused;
+
+  __le32 hotfix_map;			/* info about remapped bad sectors */
+  __le32 n_spares_used;			/* number of hotfixes */
+  __le32 n_spares;			/* number of spares in hotfix map */
+  __le32 n_dnode_spares_free;		/* spare dnodes unused */
+  __le32 n_dnode_spares;		/* length of spare_dnodes[] list,
+					   follows in this block*/
+  __le32 code_page_dir;			/* code page directory block */
+  __le32 n_code_pages;			/* number of code pages */
+  __le32 super_crc;			/* on HPFS386 and LAN Server this is
+  					   checksum of superblock, on normal
+					   OS/2 unused */
+  __le32 spare_crc;			/* on HPFS386 checksum of spareblock */
+  __le32 zero1[15];			/* unused */
+  __le32 spare_dnodes[100];		/* emergency free dnode list */
+  __le32 zero2[1];			/* room for more? */
+};
+
+/* The bad block list is 4 sectors long.  The first word must be zero,
+   the remaining words give n_badblocks bad block numbers.
+   I bet you can see it coming... */
+
+#define BAD_MAGIC 0
+       
+/* The hotfix map is 4 sectors long.  It looks like
+
+       secno from[n_spares];
+       secno to[n_spares];
+
+   The to[] list is initialized to point to n_spares preallocated empty
+   sectors.  The from[] list contains the sector numbers of bad blocks
+   which have been remapped to corresponding sectors in the to[] list.
+   n_spares_used gives the length of the from[] list. */
+
+
+/* Sectors 18 and 19 are preallocated and unused.
+   Maybe they're spares for 16 and 17, but simple substitution fails. */
+
+
+/* The code page info pointed to by the spare block consists of an index
+   block and blocks containing uppercasing tables.  I don't know what
+   these are for (CHKDSK, maybe?) -- OS/2 does not seem to use them
+   itself.  Linux doesn't use them either. */
+
+/* block pointed to by spareblock->code_page_dir */
+
+#define CP_DIR_MAGIC 0x494521f7
+
+struct code_page_directory
+{
+  __le32 magic;				/* 4945 21f7 */
+  __le32 n_code_pages;			/* number of pointers following */
+  __le32 zero1[2];
+  struct {
+    __le16 ix;				/* index */
+    __le16 code_page_number;		/* code page number */
+    __le32 bounds;			/* matches corresponding word
+					   in data block */
+    __le32 code_page_data;		/* sector number of a code_page_data
+					   containing c.p. array */
+    __le16 index;			/* index in c.p. array in that sector*/
+    __le16 unknown;			/* some unknown value; usually 0;
+    					   2 in Japanese version */
+  } array[31];				/* unknown length */
+};
+
+/* blocks pointed to by code_page_directory */
+
+#define CP_DATA_MAGIC 0x894521f7
+
+struct code_page_data
+{
+  __le32 magic;				/* 8945 21f7 */
+  __le32 n_used;			/* # elements used in c_p_data[] */
+  __le32 bounds[3];			/* looks a bit like
+					     (beg1,end1), (beg2,end2)
+					   one byte each */
+  __le16 offs[3];			/* offsets from start of sector
+					   to start of c_p_data[ix] */
+  struct {
+    __le16 ix;				/* index */
+    __le16 code_page_number;		/* code page number */
+    __le16 unknown;			/* the same as in cp directory */
+    u8 map[128];			/* upcase table for chars 80..ff */
+    __le16 zero2;
+  } code_page[3];
+  u8 incognita[78];
+};
+
+
+/* Free space bitmaps are 4 sectors long, which is 16384 bits.
+   16384 sectors is 8 meg, and each 8 meg band has a 4-sector bitmap.
+   Bit order in the maps is little-endian.  0 means taken, 1 means free.
+
+   Bit map sectors are marked allocated in the bit maps, and so are sectors 
+   off the end of the partition.
+
+   Band 0 is sectors 0-3fff, its map is in sectors 18-1b.
+   Band 1 is 4000-7fff, its map is in 7ffc-7fff.
+   Band 2 is 8000-ffff, its map is in 8000-8003.
+   The remaining bands have maps in their first (even) or last (odd) 4 sectors
+     -- if the last, partial, band is odd its map is in its last 4 sectors.
+
+   The bitmap locations are given in a table pointed to by the super block.
+   No doubt they aren't constrained to be at 18, 7ffc, 8000, ...; that is
+   just where they usually are.
+
+   The "directory band" is a bunch of sectors preallocated for dnodes.
+   It has a 4-sector free space bitmap of its own.  Each bit in the map
+   corresponds to one 4-sector dnode, bit 0 of the map corresponding to
+   the first 4 sectors of the directory band.  The entire band is marked
+   allocated in the main bitmap.   The super block gives the locations
+   of the directory band and its bitmap.  ("band" doesn't mean it is
+   8 meg long; it isn't.)  */
+
+
+/* dnode: directory.  4 sectors long */
+
+/* A directory is a tree of dnodes.  The fnode for a directory
+   contains one pointer, to the root dnode of the tree.  The fnode
+   never moves, the dnodes do the B-tree thing, splitting and merging
+   as files are added and removed.  */
+
+#define DNODE_MAGIC   0x77e40aae
+
+struct dnode {
+  __le32 magic;				/* 77e4 0aae */
+  __le32 first_free;			/* offset from start of dnode to
+					   first free dir entry */
+#ifdef __LITTLE_ENDIAN
+  u8 root_dnode: 1;			/* Is it root dnode? */
+  u8 increment_me: 7;			/* some kind of activity counter? */
+					/* Neither HPFS.IFS nor CHKDSK cares
+					   if you change this word */
+#else
+  u8 increment_me: 7;			/* some kind of activity counter? */
+					/* Neither HPFS.IFS nor CHKDSK cares
+					   if you change this word */
+  u8 root_dnode: 1;			/* Is it root dnode? */
+#endif
+  u8 increment_me2[3];
+  __le32 up;				/* (root dnode) directory's fnode
+					   (nonroot) parent dnode */
+  __le32 self;			/* pointer to this dnode */
+  u8 dirent[2028];			/* one or more dirents */
+};
+
+struct hpfs_dirent {
+  __le16 length;			/* offset to next dirent */
+
+#ifdef __LITTLE_ENDIAN
+  u8 first: 1;				/* set on phony ^A^A (".") entry */
+  u8 has_acl: 1;
+  u8 down: 1;				/* down pointer present (after name) */
+  u8 last: 1;				/* set on phony \377 entry */
+  u8 has_ea: 1;				/* entry has EA */
+  u8 has_xtd_perm: 1;			/* has extended perm list (???) */
+  u8 has_explicit_acl: 1;
+  u8 has_needea: 1;			/* ?? some EA has NEEDEA set
+					   I have no idea why this is
+					   interesting in a dir entry */
+#else
+  u8 has_needea: 1;			/* ?? some EA has NEEDEA set
+					   I have no idea why this is
+					   interesting in a dir entry */
+  u8 has_explicit_acl: 1;
+  u8 has_xtd_perm: 1;			/* has extended perm list (???) */
+  u8 has_ea: 1;				/* entry has EA */
+  u8 last: 1;				/* set on phony \377 entry */
+  u8 down: 1;				/* down pointer present (after name) */
+  u8 has_acl: 1;
+  u8 first: 1;				/* set on phony ^A^A (".") entry */
+#endif
+
+#ifdef __LITTLE_ENDIAN
+  u8 read_only: 1;			/* dos attrib */
+  u8 hidden: 1;				/* dos attrib */
+  u8 system: 1;				/* dos attrib */
+  u8 flag11: 1;				/* would be volume label dos attrib */
+  u8 directory: 1;			/* dos attrib */
+  u8 archive: 1;			/* dos attrib */
+  u8 not_8x3: 1;			/* name is not 8.3 */
+  u8 flag15: 1;
+#else
+  u8 flag15: 1;
+  u8 not_8x3: 1;			/* name is not 8.3 */
+  u8 archive: 1;			/* dos attrib */
+  u8 directory: 1;			/* dos attrib */
+  u8 flag11: 1;				/* would be volume label dos attrib */
+  u8 system: 1;				/* dos attrib */
+  u8 hidden: 1;				/* dos attrib */
+  u8 read_only: 1;			/* dos attrib */
+#endif
+
+  __le32 fnode;				/* fnode giving allocation info */
+  __le32 write_date;			/* mtime */
+  __le32 file_size;			/* file length, bytes */
+  __le32 read_date;			/* atime */
+  __le32 creation_date;			/* ctime */
+  __le32 ea_size;			/* total EA length, bytes */
+  u8 no_of_acls;			/* number of ACL's (low 3 bits) */
+  u8 ix;				/* code page index (of filename), see
+					   struct code_page_data */
+  u8 namelen;				/* file name length */
+  u8 name[];				/* file name */
+  /* dnode_secno down;	  btree down pointer, if present,
+     			  follows name on next word boundary, or maybe it
+			  precedes next dirent, which is on a word boundary. */
+};
+
+
+/* B+ tree: allocation info in fnodes and anodes */
+
+/* dnodes point to fnodes which are responsible for listing the sectors
+   assigned to the file.  This is done with trees of (length,address)
+   pairs.  (Actually triples, of (length, file-address, disk-address)
+   which can represent holes.  Find out if HPFS does that.)
+   At any rate, fnodes contain a small tree; if subtrees are needed
+   they occupy essentially a full block in anodes.  A leaf-level tree node
+   has 3-word entries giving sector runs, a non-leaf node has 2-word
+   entries giving subtree pointers.  A flag in the header says which. */
+
+struct bplus_leaf_node
+{
+  __le32 file_secno;			/* first file sector in extent */
+  __le32 length;			/* length, sectors */
+  __le32 disk_secno;			/* first corresponding disk sector */
+};
+
+struct bplus_internal_node
+{
+  __le32 file_secno;			/* subtree maps sectors < this  */
+  __le32 down;				/* pointer to subtree */
+};
+
+enum {
+	BP_hbff = 1,
+	BP_fnode_parent = 0x20,
+	BP_binary_search = 0x40,
+	BP_internal = 0x80
+};
+struct bplus_header
+{
+  u8 flags;				/* bit 0 - high bit of first free entry offset
+					   bit 5 - we're pointed to by an fnode,
+					   the data btree or some ea or the
+					   main ea bootage pointer ea_secno
+					   bit 6 - suggest binary search (unused)
+					   bit 7 - 1 -> (internal) tree of anodes
+						   0 -> (leaf) list of extents */
+  u8 fill[3];
+  u8 n_free_nodes;			/* free nodes in following array */
+  u8 n_used_nodes;			/* used nodes in following array */
+  __le16 first_free;			/* offset from start of header to
+					   first free node in array */
+  union {
+	/* (internal) 2-word entries giving subtree pointers */
+	DECLARE_FLEX_ARRAY(struct bplus_internal_node, internal);
+	/* (external) 3-word entries giving sector runs */
+	DECLARE_FLEX_ARRAY(struct bplus_leaf_node, external);
+  } u;
+};
+
+static inline bool bp_internal(struct bplus_header *bp)
+{
+	return bp->flags & BP_internal;
+}
+
+static inline bool bp_fnode_parent(struct bplus_header *bp)
+{
+	return bp->flags & BP_fnode_parent;
+}
+
+/* fnode: root of allocation b+ tree, and EA's */
+
+/* Every file and every directory has one fnode, pointed to by the directory
+   entry and pointing to the file's sectors or directory's root dnode.  EA's
+   are also stored here, and there are said to be ACL's somewhere here too. */
+
+#define FNODE_MAGIC 0xf7e40aae
+
+enum {FNODE_anode = cpu_to_le16(2), FNODE_dir = cpu_to_le16(256)};
+struct fnode
+{
+  __le32 magic;				/* f7e4 0aae */
+  __le32 zero1[2];			/* read history */
+  u8 len, name[15];			/* true length, truncated name */
+  __le32 up;				/* pointer to file's directory fnode */
+  __le32 acl_size_l;
+  __le32 acl_secno;
+  __le16 acl_size_s;
+  u8 acl_anode;
+  u8 zero2;				/* history bit count */
+  __le32 ea_size_l;			/* length of disk-resident ea's */
+  __le32 ea_secno;			/* first sector of disk-resident ea's*/
+  __le16 ea_size_s;			/* length of fnode-resident ea's */
+
+  __le16 flags;				/* bit 1 set -> ea_secno is an anode */
+					/* bit 8 set -> directory.  first & only extent
+					   points to dnode. */
+  struct bplus_header btree;		/* b+ tree, 8 extents or 12 subtrees */
+  union {
+    struct bplus_leaf_node external[8];
+    struct bplus_internal_node internal[12];
+  } u;
+
+  __le32 file_size;			/* file length, bytes */
+  __le32 n_needea;			/* number of EA's with NEEDEA set */
+  u8 user_id[16];			/* unused */
+  __le16 ea_offs;			/* offset from start of fnode
+					   to first fnode-resident ea */
+  u8 dasd_limit_treshhold;
+  u8 dasd_limit_delta;
+  __le32 dasd_limit;
+  __le32 dasd_usage;
+  u8 ea[316];				/* zero or more EA's, packed together
+					   with no alignment padding.
+					   (Do not use this name, get here
+					   via fnode + ea_offs. I think.) */
+};
+
+static inline bool fnode_in_anode(struct fnode *p)
+{
+	return (p->flags & FNODE_anode) != 0;
+}
+
+static inline bool fnode_is_dir(struct fnode *p)
+{
+	return (p->flags & FNODE_dir) != 0;
+}
+
+
+/* anode: 99.44% pure allocation tree */
+
+#define ANODE_MAGIC 0x37e40aae
+
+struct anode
+{
+  __le32 magic;				/* 37e4 0aae */
+  __le32 self;				/* pointer to this anode */
+  __le32 up;				/* parent anode or fnode */
+
+  struct bplus_header btree;		/* b+tree, 40 extents or 60 subtrees */
+  union {
+    struct bplus_leaf_node external[40];
+    struct bplus_internal_node internal[60];
+  } u;
+
+  __le32 fill[3];			/* unused */
+};
+
+
+/* extended attributes.
+
+   A file's EA info is stored as a list of (name,value) pairs.  It is
+   usually in the fnode, but (if it's large) it is moved to a single
+   sector run outside the fnode, or to multiple runs with an anode tree
+   that points to them.
+
+   The value of a single EA is stored along with the name, or (if large)
+   it is moved to a single sector run, or multiple runs pointed to by an
+   anode tree, pointed to by the value field of the (name,value) pair.
+
+   Flags in the EA tell whether the value is immediate, in a single sector
+   run, or in multiple runs.  Flags in the fnode tell whether the EA list
+   is immediate, in a single run, or in multiple runs. */
+
+enum {EA_indirect = 1, EA_anode = 2, EA_needea = 128 };
+struct extended_attribute
+{
+  u8 flags;				/* bit 0 set -> value gives sector number
+					   where real value starts */
+					/* bit 1 set -> sector is an anode
+					   that points to fragmented value */
+					/* bit 7 set -> required ea */
+  u8 namelen;				/* length of name, bytes */
+  u8 valuelen_lo;			/* length of value, bytes */
+  u8 valuelen_hi;			/* length of value, bytes */
+  u8 name[];
+  /*
+    u8 name[namelen];			ascii attrib name
+    u8 nul;				terminating '\0', not counted
+    u8 value[valuelen];			value, arbitrary
+      if this.flags & 1, valuelen is 8 and the value is
+        u32 length;			real length of value, bytes
+        secno secno;			sector address where it starts
+      if this.anode, the above sector number is the root of an anode tree
+        which points to the value.
+  */
+};
+
+static inline bool ea_indirect(struct extended_attribute *ea)
+{
+	return ea->flags & EA_indirect;
+}
+
+static inline bool ea_in_anode(struct extended_attribute *ea)
+{
+	return ea->flags & EA_anode;
+}
+
+/*
+   Local Variables:
+   comment-column: 40
+   End:
+*/