Initial revision

1 files changed, 301 insertions, 0 deletions

diff --git a/ext2fs/ext2fs.h b/ext2fs/ext2fs.h
new file mode 100644
index 00000000..a7c9a891
--- /dev/null
+++ b/ext2fs/ext2fs.h
@@ -0,0 +1,301 @@
+/* 
+   Copyright (C) 1994 Free Software Foundation
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2, or (at
+   your option) any later version.
+
+   This program is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#include <mach.h>
+#include <hurd.h>
+#include <hurd/ports.h>
+#include <hurd/pager.h>
+#include <hurd/fshelp.h>
+#include <hurd/ioserver.h>
+#include <hurd/diskfs.h>
+#include <assert.h>
+#include "fs.h"
+#include "dinode.h"
+
+/* Define this if memory objects should not be cached by the kernel.
+   Normally, don't define it, but defining it causes a much greater rate
+   of paging requests, which may be helpful in catching bugs. */
+
+/* #undef DONT_CACHE_MEMORY_OBJECTS */
+
+/* Simple reader/writer lock. */
+struct rwlock
+{
+  struct mutex master;
+  struct condition wakeup;
+  int readers;
+  int writers_waiting;
+  int readers_waiting;
+};
+
+struct disknode 
+{
+  ino_t number;
+
+  /* For a directory, this array holds the number of directory entries in
+     each DIRBLKSIZE piece of the directory. */
+  int *dirents;
+
+  /* Links on hash list. */
+  struct node *hnext, **hprevp;
+
+  struct rwlock allocptrlock;
+
+  struct dirty_indir *dirty;
+
+  struct user_pager_info *fileinfo;
+};  
+
+/* Get a reader lock on reader-writer lock LOCK for disknode DN */
+extern inline void
+rwlock_reader_lock (struct rwlock *lock)
+{
+  mutex_lock (&lock->master);
+  if (lock->readers == -1 || lock->writers_waiting)
+    {
+      lock->readers_waiting++;
+      do
+	condition_wait (&lock->wakeup, &lock->master);
+      while (lock->readers == -1 || lock->writers_waiting);
+      lock->readers_waiting--;
+    }
+  lock->readers++;
+  mutex_unlock (&lock->master);
+}
+
+/* Identifies a particular block and where it's found
+   when interpreting indirect block structure.  */
+struct iblock_spec
+{
+  /* Disk address of block */
+  daddr_t bno;
+
+  /* Offset in next block up; -1 if it's in the inode itself. */
+  int offset;
+};
+
+/* Identifies an indirect block owned by this file which
+   might be dirty. */
+struct dirty_indir
+{
+  daddr_t bno;			/* Disk address of block. */
+  struct dirty_indir *next;
+};
+
+/* Get a writer lock on reader-writer lock LOCK for disknode DN */
+extern inline void
+rwlock_writer_lock (struct rwlock *lock)
+{
+  mutex_lock (&lock->master);
+  if (lock->readers)
+    {
+      lock->writers_waiting++;
+      do
+	condition_wait (&lock->wakeup, &lock->master);
+      while (lock->readers);
+      lock->writers_waiting--;
+    }
+  lock->readers = -1;
+  mutex_unlock (&lock->master);
+}
+
+/* Release a reader lock on reader-writer lock LOCK for disknode DN */
+extern inline void
+rwlock_reader_unlock (struct rwlock *lock)
+{
+  mutex_lock (&lock->master);
+  assert (lock->readers);
+  lock->readers--;
+  if (lock->readers_waiting || lock->writers_waiting)
+    condition_broadcast (&lock->wakeup);
+  mutex_unlock (&lock->master);
+}
+
+/* Release a writer lock on reader-writer lock LOCK for disknode DN */
+extern inline void
+rwlock_writer_unlock (struct rwlock *lock)
+{
+  mutex_lock (&lock->master);
+  assert (lock->readers == -1);
+  lock->readers = 0;
+  if (lock->readers_waiting || lock->writers_waiting)
+    condition_broadcast (&lock->wakeup);
+  mutex_unlock (&lock->master);
+}
+
+/* Initialize reader-writer lock LOCK */
+extern inline void
+rwlock_init (struct rwlock *lock)
+{
+  mutex_init (&lock->master);
+  condition_init (&lock->wakeup);
+  lock->readers = 0;
+  lock->readers_waiting = 0;
+  lock->writers_waiting = 0;
+}
+
+struct user_pager_info 
+{
+  struct node *np;
+  enum pager_type 
+    {
+      DISK,
+      FILE_DATA,
+    } type;
+  struct pager *p;
+  struct user_pager_info *next, **prevp;
+};
+
+struct user_pager_info *diskpager;
+mach_port_t diskpagerport;
+off_t diskpagersize;
+
+vm_address_t zeroblock;
+
+struct fs *sblock;
+struct csum *csum;
+int sblock_dirty;
+int csum_dirty;
+
+void *disk_image;
+
+spin_lock_t node2pagelock;
+
+spin_lock_t alloclock;
+
+spin_lock_t gennumberlock;
+u_long nextgennumber;
+
+mach_port_t ufs_device;
+
+/* The compat_mode specifies whether or not we write
+   extensions onto the disk. */
+enum compat_mode
+{
+  COMPAT_GNU = 0,
+  COMPAT_BSD42 = 1,
+  COMPAT_BSD44 = 2,
+} compat_mode;
+
+/* If this is set, then this filesystem has two extensions:
+   1) directory entries include the type field.
+   2) symlink targets might be written directly in the di_db field 
+      of the dinode. */
+int direct_symlink_extension;
+
+
+/* Handy macros */
+#define DEV_BSIZE 512
+#define NBBY 8
+#define btodb(n) ((n) / DEV_BSIZE)
+#define howmany(x,y) (((x)+((y)-1))/(y))
+#define roundup(x, y) ((((x)+((y)-1))/(y))*(y))
+#define isclr(a, i) (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0)
+#define isset(a, i) ((a)[(i)/NBBY] & (1<<((i)%NBBY)))
+#define setbit(a,i) ((a)[(i)/NBBY] |= 1<<((i)%NBBY))
+#define clrbit(a,i) ((a)[(i)/NBBY] &= ~(1<<(i)%NBBY))
+#define fsaddr(fs,n) (fsbtodb(fs,n)*DEV_BSIZE)
+
+
+/* Functions for looking inside disk_image */
+
+/* Convert an inode number to the dinode on disk. */
+extern inline struct dinode *
+dino (ino_t inum)
+{
+  return (struct dinode *)
+    (disk_image 
+     + fsaddr (sblock, ino_to_fsba (sblock, inum))
+     + ino_to_fsbo (sblock, inum) * sizeof (struct dinode));
+}
+
+/* Convert a indirect block number to a daddr_t table. */
+extern inline daddr_t *
+indir_block (daddr_t bno)
+{
+  return (daddr_t *) (disk_image + fsaddr (sblock, bno));
+}
+
+/* Convert a cg number to the cylinder group. */
+extern inline struct cg *
+cg_locate (int ncg)
+{
+  return (struct cg *) (disk_image + fsaddr (sblock, cgtod (sblock, ncg)));
+}
+
+/* Sync part of the disk */
+extern inline void
+sync_disk_blocks (daddr_t blkno, size_t nbytes, int wait)
+{
+  pager_sync_some (diskpager->p, fsaddr (sblock, blkno), nbytes, wait);
+}
+
+/* Sync an disk inode */
+extern inline void
+sync_dinode (int inum, int wait)
+{
+  sync_disk_blocks (ino_to_fsba (sblock, inum), sblock->fs_fsize, wait);
+}
+
+/* From alloc.c: */
+error_t ffs_alloc (struct node *, daddr_t, daddr_t, int, daddr_t *, 
+		   struct protid *);
+void ffs_blkfree(struct node *, daddr_t bno, long size);
+daddr_t ffs_blkpref (struct node *, daddr_t, int, daddr_t *);
+error_t ffs_realloccg(struct node *, daddr_t, daddr_t,
+		  int, int, daddr_t *, struct protid *);
+
+/* From bmap.c */
+error_t fetch_indir_spec (struct node *, daddr_t, struct iblock_spec *);
+void mark_indir_dirty (struct node *, daddr_t);
+
+/* From devio.c: */
+error_t dev_write_sync (daddr_t addr, vm_address_t data, long len);
+error_t dev_write (daddr_t addr, vm_address_t data, long len);
+error_t dev_read_sync (daddr_t addr, vm_address_t *data, long len);
+
+/* From hyper.c: */
+void get_hypermetadata (void);
+void copy_sblock (void);
+
+/* From inode.c: */
+error_t iget (ino_t ino, struct node **NP);
+struct node *ifind (ino_t ino);
+void inode_init (void);
+void write_all_disknodes (void);
+
+/* From pager.c: */
+void create_disk_pager (void);
+void din_map (struct node *);
+void sin_map (struct node *);
+void sin_remap (struct node *, int);
+void sin_unmap (struct node *);
+void din_unmap (struct node *);
+void drop_pager_softrefs (struct node *);
+void allow_pager_softrefs (struct node *);
+
+/* From subr.c: */
+void ffs_fragacct (struct fs *, int, long [], int);
+int ffs_isblock(struct fs *, u_char *, daddr_t);
+void ffs_clrblock(struct fs *, u_char *, daddr_t);
+void ffs_setblock (struct fs *, u_char *, daddr_t);
+int skpc (int, int, char *);
+int scanc (u_int, u_char *, u_char [], int);
+
+/* From pokeloc.c: */
+void record_poke (void *, vm_size_t);
+void sync_disk (int);