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-rw-r--r--fs/hpfs/hpfs.h439
1 files changed, 257 insertions, 182 deletions
diff --git a/fs/hpfs/hpfs.h b/fs/hpfs/hpfs.h
index 0e84c73..8b0650a 100644
--- a/fs/hpfs/hpfs.h
+++ b/fs/hpfs/hpfs.h
@@ -19,9 +19,13 @@
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 unsigned secno; /* sector number, partition relative */
+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 */
@@ -38,28 +42,28 @@ typedef u32 time32_t; /* 32-bit time_t type */
struct hpfs_boot_block
{
- unsigned char jmp[3];
- unsigned char oem_id[8];
- unsigned char bytes_per_sector[2]; /* 512 */
- unsigned char sectors_per_cluster;
- unsigned char n_reserved_sectors[2];
- unsigned char n_fats;
- unsigned char n_rootdir_entries[2];
- unsigned char n_sectors_s[2];
- unsigned char media_byte;
- unsigned short sectors_per_fat;
- unsigned short sectors_per_track;
- unsigned short heads_per_cyl;
- unsigned int n_hidden_sectors;
- unsigned int n_sectors_l; /* size of partition */
- unsigned char drive_number;
- unsigned char mbz;
- unsigned char sig_28h; /* 28h */
- unsigned char vol_serno[4];
- unsigned char vol_label[11];
- unsigned char sig_hpfs[8]; /* "HPFS " */
- unsigned char pad[448];
- unsigned short magic; /* aa55 */
+ 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;
+ u16 sectors_per_fat;
+ u16 sectors_per_track;
+ u16 heads_per_cyl;
+ u32 n_hidden_sectors;
+ u32 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];
+ u16 magic; /* aa55 */
};
@@ -71,31 +75,29 @@ struct hpfs_boot_block
struct hpfs_super_block
{
- unsigned magic; /* f995 e849 */
- unsigned magic1; /* fa53 e9c5, more magic? */
- /*unsigned huh202;*/ /* ?? 202 = N. of B. in 1.00390625 S.*/
- char version; /* version of a filesystem usually 2 */
- char funcversion; /* functional version - oldest version
+ u32 magic; /* f995 e849 */
+ u32 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 */
- unsigned short int zero; /* 0 */
+ u16 zero; /* 0 */
fnode_secno root; /* fnode of root directory */
secno n_sectors; /* size of filesystem */
- unsigned n_badblocks; /* number of bad blocks */
+ u32 n_badblocks; /* number of bad blocks */
secno bitmaps; /* pointers to free space bit maps */
- unsigned zero1; /* 0 */
+ u32 zero1; /* 0 */
secno badblocks; /* bad block list */
- unsigned zero3; /* 0 */
+ u32 zero3; /* 0 */
time32_t last_chkdsk; /* date last checked, 0 if never */
- /*unsigned zero4;*/ /* 0 */
- time32_t last_optimize; /* date last optimized, 0 if never */
+ time32_t last_optimize; /* date last optimized, 0 if never */
secno n_dir_band; /* number of sectors in dir band */
secno dir_band_start; /* first sector in dir band */
secno dir_band_end; /* last sector in dir band */
secno dir_band_bitmap; /* free space map, 1 dnode per bit */
- char volume_name[32]; /* not used */
+ u8 volume_name[32]; /* not used */
secno user_id_table; /* 8 preallocated sectors - user id */
- unsigned zero6[103]; /* 0 */
+ u32 zero6[103]; /* 0 */
};
@@ -107,44 +109,65 @@ struct hpfs_super_block
struct hpfs_spare_block
{
- unsigned magic; /* f991 1849 */
- unsigned magic1; /* fa52 29c5, more magic? */
-
- unsigned dirty: 1; /* 0 clean, 1 "improperly stopped" */
- /*unsigned flag1234: 4;*/ /* unknown flags */
- unsigned sparedir_used: 1; /* spare dirblks used */
- unsigned hotfixes_used: 1; /* hotfixes used */
- unsigned bad_sector: 1; /* bad sector, corrupted disk (???) */
- unsigned bad_bitmap: 1; /* bad bitmap */
- unsigned fast: 1; /* partition was fast formatted */
- unsigned old_wrote: 1; /* old version wrote to partion */
- unsigned old_wrote_1: 1; /* old version wrote to partion (?) */
- unsigned install_dasd_limits: 1; /* HPFS386 flags */
- unsigned resynch_dasd_limits: 1;
- unsigned dasd_limits_operational: 1;
- unsigned multimedia_active: 1;
- unsigned dce_acls_active: 1;
- unsigned dasd_limits_dirty: 1;
- unsigned flag67: 2;
- unsigned char mm_contlgulty;
- unsigned char unused;
+ u32 magic; /* f991 1849 */
+ u32 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 partion */
+ u8 old_wrote_1: 1; /* old version wrote to partion (?) */
+#else
+ u8 old_wrote_1: 1; /* old version wrote to partion (?) */
+ u8 old_wrote: 1; /* old version wrote to partion */
+ 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;
secno hotfix_map; /* info about remapped bad sectors */
- unsigned n_spares_used; /* number of hotfixes */
- unsigned n_spares; /* number of spares in hotfix map */
- unsigned n_dnode_spares_free; /* spare dnodes unused */
- unsigned n_dnode_spares; /* length of spare_dnodes[] list,
+ u32 n_spares_used; /* number of hotfixes */
+ u32 n_spares; /* number of spares in hotfix map */
+ u32 n_dnode_spares_free; /* spare dnodes unused */
+ u32 n_dnode_spares; /* length of spare_dnodes[] list,
follows in this block*/
secno code_page_dir; /* code page directory block */
- unsigned n_code_pages; /* number of code pages */
- /*unsigned large_numbers[2];*/ /* ?? */
- unsigned super_crc; /* on HPFS386 and LAN Server this is
+ u32 n_code_pages; /* number of code pages */
+ u32 super_crc; /* on HPFS386 and LAN Server this is
checksum of superblock, on normal
OS/2 unused */
- unsigned spare_crc; /* on HPFS386 checksum of spareblock */
- unsigned zero1[15]; /* unused */
+ u32 spare_crc; /* on HPFS386 checksum of spareblock */
+ u32 zero1[15]; /* unused */
dnode_secno spare_dnodes[100]; /* emergency free dnode list */
- unsigned zero2[1]; /* room for more? */
+ u32 zero2[1]; /* room for more? */
};
/* The bad block list is 4 sectors long. The first word must be zero,
@@ -179,18 +202,18 @@ struct hpfs_spare_block
struct code_page_directory
{
- unsigned magic; /* 4945 21f7 */
- unsigned n_code_pages; /* number of pointers following */
- unsigned zero1[2];
+ u32 magic; /* 4945 21f7 */
+ u32 n_code_pages; /* number of pointers following */
+ u32 zero1[2];
struct {
- unsigned short ix; /* index */
- unsigned short code_page_number; /* code page number */
- unsigned bounds; /* matches corresponding word
+ u16 ix; /* index */
+ u16 code_page_number; /* code page number */
+ u32 bounds; /* matches corresponding word
in data block */
secno code_page_data; /* sector number of a code_page_data
containing c.p. array */
- unsigned short index; /* index in c.p. array in that sector*/
- unsigned short unknown; /* some unknown value; usually 0;
+ u16 index; /* index in c.p. array in that sector*/
+ u16 unknown; /* some unknown value; usually 0;
2 in Japanese version */
} array[31]; /* unknown length */
};
@@ -201,21 +224,21 @@ struct code_page_directory
struct code_page_data
{
- unsigned magic; /* 8945 21f7 */
- unsigned n_used; /* # elements used in c_p_data[] */
- unsigned bounds[3]; /* looks a bit like
+ u32 magic; /* 8945 21f7 */
+ u32 n_used; /* # elements used in c_p_data[] */
+ u32 bounds[3]; /* looks a bit like
(beg1,end1), (beg2,end2)
one byte each */
- unsigned short offs[3]; /* offsets from start of sector
+ u16 offs[3]; /* offsets from start of sector
to start of c_p_data[ix] */
struct {
- unsigned short ix; /* index */
- unsigned short code_page_number; /* code page number */
- unsigned short unknown; /* the same as in cp directory */
- unsigned char map[128]; /* upcase table for chars 80..ff */
- unsigned short zero2;
+ u16 ix; /* index */
+ u16 code_page_number; /* code page number */
+ u16 unknown; /* the same as in cp directory */
+ u8 map[128]; /* upcase table for chars 80..ff */
+ u16 zero2;
} code_page[3];
- unsigned char incognita[78];
+ u8 incognita[78];
};
@@ -255,50 +278,84 @@ struct code_page_data
#define DNODE_MAGIC 0x77e40aae
struct dnode {
- unsigned magic; /* 77e4 0aae */
- unsigned first_free; /* offset from start of dnode to
+ u32 magic; /* 77e4 0aae */
+ u32 first_free; /* offset from start of dnode to
first free dir entry */
- unsigned root_dnode:1; /* Is it root dnode? */
- unsigned increment_me:31; /* some kind of activity counter?
- Neither HPFS.IFS nor CHKDSK cares
+#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];
secno up; /* (root dnode) directory's fnode
(nonroot) parent dnode */
dnode_secno self; /* pointer to this dnode */
- unsigned char dirent[2028]; /* one or more dirents */
+ u8 dirent[2028]; /* one or more dirents */
};
struct hpfs_dirent {
- unsigned short length; /* offset to next dirent */
- unsigned first: 1; /* set on phony ^A^A (".") entry */
- unsigned has_acl: 1;
- unsigned down: 1; /* down pointer present (after name) */
- unsigned last: 1; /* set on phony \377 entry */
- unsigned has_ea: 1; /* entry has EA */
- unsigned has_xtd_perm: 1; /* has extended perm list (???) */
- unsigned has_explicit_acl: 1;
- unsigned has_needea: 1; /* ?? some EA has NEEDEA set
+ u16 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 */
- unsigned read_only: 1; /* dos attrib */
- unsigned hidden: 1; /* dos attrib */
- unsigned system: 1; /* dos attrib */
- unsigned flag11: 1; /* would be volume label dos attrib */
- unsigned directory: 1; /* dos attrib */
- unsigned archive: 1; /* dos attrib */
- unsigned not_8x3: 1; /* name is not 8.3 */
- unsigned flag15: 1;
+ 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
+
fnode_secno fnode; /* fnode giving allocation info */
time32_t write_date; /* mtime */
- unsigned file_size; /* file length, bytes */
+ u32 file_size; /* file length, bytes */
time32_t read_date; /* atime */
time32_t creation_date; /* ctime */
- unsigned ea_size; /* total EA length, bytes */
- unsigned char no_of_acls : 3; /* number of ACL's */
- unsigned char reserver : 5;
- unsigned char ix; /* code page index (of filename), see
+ u32 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 */
- unsigned char namelen, name[1]; /* file name */
+ u8 namelen, name[1]; /* 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. */
@@ -318,38 +375,50 @@ struct hpfs_dirent {
struct bplus_leaf_node
{
- unsigned file_secno; /* first file sector in extent */
- unsigned length; /* length, sectors */
+ u32 file_secno; /* first file sector in extent */
+ u32 length; /* length, sectors */
secno disk_secno; /* first corresponding disk sector */
};
struct bplus_internal_node
{
- unsigned file_secno; /* subtree maps sectors < this */
+ u32 file_secno; /* subtree maps sectors < this */
anode_secno down; /* pointer to subtree */
};
struct bplus_header
{
- unsigned hbff: 1; /* high bit of first free entry offset */
- unsigned flag1: 1;
- unsigned flag2: 1;
- unsigned flag3: 1;
- unsigned flag4: 1;
- unsigned fnode_parent: 1; /* ? we're pointed to by an fnode,
+#ifdef __LITTLE_ENDIAN
+ u8 hbff: 1; /* high bit of first free entry offset */
+ u8 flag1234: 4;
+ u8 fnode_parent: 1; /* ? we're pointed to by an fnode,
the data btree or some ea or the
main ea bootage pointer ea_secno */
/* also can get set in fnodes, which
may be a chkdsk glitch or may mean
this bit is irrelevant in fnodes,
or this interpretation is all wet */
- unsigned binary_search: 1; /* suggest binary search (unused) */
- unsigned internal: 1; /* 1 -> (internal) tree of anodes
+ u8 binary_search: 1; /* suggest binary search (unused) */
+ u8 internal: 1; /* 1 -> (internal) tree of anodes
+ 0 -> (leaf) list of extents */
+#else
+ u8 internal: 1; /* 1 -> (internal) tree of anodes
0 -> (leaf) list of extents */
- unsigned char fill[3];
- unsigned char n_free_nodes; /* free nodes in following array */
- unsigned char n_used_nodes; /* used nodes in following array */
- unsigned short first_free; /* offset from start of header to
+ u8 binary_search: 1; /* suggest binary search (unused) */
+ u8 fnode_parent: 1; /* ? we're pointed to by an fnode,
+ the data btree or some ea or the
+ main ea bootage pointer ea_secno */
+ /* also can get set in fnodes, which
+ may be a chkdsk glitch or may mean
+ this bit is irrelevant in fnodes,
+ or this interpretation is all wet */
+ u8 flag1234: 4;
+ u8 hbff: 1; /* high bit of first free entry offset */
+#endif
+ u8 fill[3];
+ u8 n_free_nodes; /* free nodes in following array */
+ u8 n_used_nodes; /* used nodes in following array */
+ u16 first_free; /* offset from start of header to
first free node in array */
union {
struct bplus_internal_node internal[0]; /* (internal) 2-word entries giving
@@ -369,37 +438,38 @@ struct bplus_header
struct fnode
{
- unsigned magic; /* f7e4 0aae */
- unsigned zero1[2]; /* read history */
- unsigned char len, name[15]; /* true length, truncated name */
+ u32 magic; /* f7e4 0aae */
+ u32 zero1[2]; /* read history */
+ u8 len, name[15]; /* true length, truncated name */
fnode_secno up; /* pointer to file's directory fnode */
- /*unsigned zero2[3];*/
secno acl_size_l;
secno acl_secno;
- unsigned short acl_size_s;
- char acl_anode;
- char zero2; /* history bit count */
- unsigned ea_size_l; /* length of disk-resident ea's */
+ u16 acl_size_s;
+ u8 acl_anode;
+ u8 zero2; /* history bit count */
+ u32 ea_size_l; /* length of disk-resident ea's */
secno ea_secno; /* first sector of disk-resident ea's*/
- unsigned short ea_size_s; /* length of fnode-resident ea's */
-
- unsigned flag0: 1;
- unsigned ea_anode: 1; /* 1 -> ea_secno is an anode */
- unsigned flag2: 1;
- unsigned flag3: 1;
- unsigned flag4: 1;
- unsigned flag5: 1;
- unsigned flag6: 1;
- unsigned flag7: 1;
- unsigned dirflag: 1; /* 1 -> directory. first & only extent
+ u16 ea_size_s; /* length of fnode-resident ea's */
+
+#ifdef __LITTLE_ENDIAN
+ u8 flag0: 1;
+ u8 ea_anode: 1; /* 1 -> ea_secno is an anode */
+ u8 flag234567: 6;
+#else
+ u8 flag234567: 6;
+ u8 ea_anode: 1; /* 1 -> ea_secno is an anode */
+ u8 flag0: 1;
+#endif
+
+#ifdef __LITTLE_ENDIAN
+ u8 dirflag: 1; /* 1 -> directory. first & only extent
points to dnode. */
- unsigned flag9: 1;
- unsigned flag10: 1;
- unsigned flag11: 1;
- unsigned flag12: 1;
- unsigned flag13: 1;
- unsigned flag14: 1;
- unsigned flag15: 1;
+ u8 flag9012345: 7;
+#else
+ u8 flag9012345: 7;
+ u8 dirflag: 1; /* 1 -> directory. first & only extent
+ points to dnode. */
+#endif
struct bplus_header btree; /* b+ tree, 8 extents or 12 subtrees */
union {
@@ -407,17 +477,16 @@ struct fnode
struct bplus_internal_node internal[12];
} u;
- unsigned file_size; /* file length, bytes */
- unsigned n_needea; /* number of EA's with NEEDEA set */
- char user_id[16]; /* unused */
- unsigned short ea_offs; /* offset from start of fnode
+ u32 file_size; /* file length, bytes */
+ u32 n_needea; /* number of EA's with NEEDEA set */
+ u8 user_id[16]; /* unused */
+ u16 ea_offs; /* offset from start of fnode
to first fnode-resident ea */
- char dasd_limit_treshhold;
- char dasd_limit_delta;
- unsigned dasd_limit;
- unsigned dasd_usage;
- /*unsigned zero5[2];*/
- unsigned char ea[316]; /* zero or more EA's, packed together
+ u8 dasd_limit_treshhold;
+ u8 dasd_limit_delta;
+ u32 dasd_limit;
+ u32 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.) */
@@ -430,7 +499,7 @@ struct fnode
struct anode
{
- unsigned magic; /* 37e4 0aae */
+ u32 magic; /* 37e4 0aae */
anode_secno self; /* pointer to this anode */
secno up; /* parent anode or fnode */
@@ -440,7 +509,7 @@ struct anode
struct bplus_internal_node internal[60];
} u;
- unsigned fill[3]; /* unused */
+ u32 fill[3]; /* unused */
};
@@ -461,25 +530,31 @@ struct anode
struct extended_attribute
{
- unsigned indirect: 1; /* 1 -> value gives sector number
+#ifdef __LITTLE_ENDIAN
+ u8 indirect: 1; /* 1 -> value gives sector number
where real value starts */
- unsigned anode: 1; /* 1 -> sector is an anode
+ u8 anode: 1; /* 1 -> sector is an anode
+ that points to fragmented value */
+ u8 flag23456: 5;
+ u8 needea: 1; /* required ea */
+#else
+ u8 needea: 1; /* required ea */
+ u8 flag23456: 5;
+ u8 anode: 1; /* 1 -> sector is an anode
that points to fragmented value */
- unsigned flag2: 1;
- unsigned flag3: 1;
- unsigned flag4: 1;
- unsigned flag5: 1;
- unsigned flag6: 1;
- unsigned needea: 1; /* required ea */
- unsigned char namelen; /* length of name, bytes */
- unsigned short valuelen; /* length of value, bytes */
- unsigned char name[0];
+ u8 indirect: 1; /* 1 -> value gives sector number
+ where real value starts */
+#endif
+ u8 namelen; /* length of name, bytes */
+ u8 valuelen_lo; /* length of value, bytes */
+ u8 valuelen_hi; /* length of value, bytes */
+ u8 name[0];
/*
- unsigned char name[namelen]; ascii attrib name
- unsigned char nul; terminating '\0', not counted
- unsigned char value[valuelen]; value, arbitrary
+ u8 name[namelen]; ascii attrib name
+ u8 nul; terminating '\0', not counted
+ u8 value[valuelen]; value, arbitrary
if this.indirect, valuelen is 8 and the value is
- unsigned length; real length of value, bytes
+ 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.
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