Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 493 insertions, 0 deletions

diff --git a/fs/hpfs/hpfs.h b/fs/hpfs/hpfs.h
new file mode 100644
index 000000000000..0e84c73cd9c4
--- /dev/null
+++ b/fs/hpfs/hpfs.h
@@ -0,0 +1,493 @@
+/*
+ *  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. */
+
+/* Notation */
+
+typedef unsigned 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
+{
+  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 */
+};
+
+
+/* sector 16 */
+
+/* The super block has the pointer to the root directory. */
+
+#define SB_MAGIC 0xf995e849
+
+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
+  					   of filesystem that can understand
+					   this disk */
+  unsigned short int zero;		/* 0 */
+  fnode_secno root;			/* fnode of root directory */
+  secno n_sectors;			/* size of filesystem */
+  unsigned n_badblocks;			/* number of bad blocks */
+  secno bitmaps;			/* pointers to free space bit maps */
+  unsigned zero1;			/* 0 */
+  secno badblocks;			/* bad block list */
+  unsigned 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 */
+  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 */
+  secno user_id_table;			/* 8 preallocated sectors - user id */
+  unsigned zero6[103];			/* 0 */
+};
+
+
+/* sector 17 */
+
+/* The spare block has pointers to spare sectors.  */
+
+#define SP_MAGIC 0xf9911849
+
+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;
+
+  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,
+					   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
+  					   checksum of superblock, on normal
+					   OS/2 unused */
+  unsigned spare_crc;			/* on HPFS386 checksum of spareblock */
+  unsigned zero1[15];			/* unused */
+  dnode_secno spare_dnodes[100];	/* emergency free dnode list */
+  unsigned 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
+{
+  unsigned magic;			/* 4945 21f7 */
+  unsigned n_code_pages;		/* number of pointers following */
+  unsigned zero1[2];
+  struct {
+    unsigned short ix;			/* index */
+    unsigned short code_page_number;	/* code page number */
+    unsigned 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;
+    					   2 in Japanese version */
+  } array[31];				/* unknown length */
+};
+
+/* blocks pointed to by code_page_directory */
+
+#define CP_DATA_MAGIC 0x894521f7
+
+struct code_page_data
+{
+  unsigned magic;			/* 8945 21f7 */
+  unsigned n_used;			/* # elements used in c_p_data[] */
+  unsigned bounds[3];			/* looks a bit like
+					     (beg1,end1), (beg2,end2)
+					   one byte each */
+  unsigned short 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;
+  } code_page[3];
+  unsigned char 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 {
+  unsigned magic;			/* 77e4 0aae */
+  unsigned 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
+					   if you change this word */
+  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 */
+};
+
+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
+					   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;
+  fnode_secno fnode;			/* fnode giving allocation info */
+  time32_t write_date;			/* mtime */
+  unsigned 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
+					   struct code_page_data */
+  unsigned char 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. */
+};
+
+
+/* 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
+{
+  unsigned file_secno;			/* first file sector in extent */
+  unsigned length;			/* length, sectors */
+  secno disk_secno;			/* first corresponding disk sector */
+};
+
+struct bplus_internal_node
+{
+  unsigned 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,
+					   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
+					   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
+					   first free node in array */
+  union {
+    struct bplus_internal_node internal[0]; /* (internal) 2-word entries giving
+					       subtree pointers */
+    struct bplus_leaf_node external[0];	    /* (external) 3-word entries giving
+					       sector runs */
+  } u;
+};
+
+/* 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
+
+struct fnode
+{
+  unsigned magic;			/* f7e4 0aae */
+  unsigned zero1[2];			/* read history */
+  unsigned char 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 */
+  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
+					   points to dnode. */
+  unsigned flag9: 1;
+  unsigned flag10: 1;
+  unsigned flag11: 1;
+  unsigned flag12: 1;
+  unsigned flag13: 1;
+  unsigned flag14: 1;
+  unsigned flag15: 1;
+
+  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;
+
+  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
+					   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
+					   with no alignment padding.
+					   (Do not use this name, get here
+					   via fnode + ea_offs. I think.) */
+};
+
+
+/* anode: 99.44% pure allocation tree */
+
+#define ANODE_MAGIC 0x37e40aae
+
+struct anode
+{
+  unsigned magic;			/* 37e4 0aae */
+  anode_secno self;			/* pointer to this anode */
+  secno 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;
+
+  unsigned 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. */
+
+struct extended_attribute
+{
+  unsigned indirect: 1;			/* 1 -> value gives sector number
+					   where real value starts */
+  unsigned 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];
+  /*
+    unsigned char name[namelen];	ascii attrib name
+    unsigned char nul;			terminating '\0', not counted
+    unsigned char value[valuelen];	value, arbitrary
+      if this.indirect, valuelen is 8 and the value is
+        unsigned 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.
+  */
+};
+
+/*
+   Local Variables:
+   comment-column: 40
+   End:
+*/