add -lminixfs with fs support routines

. move cache size heuristic from mfs there
	  so mfs and ext2 can share it
	. add vfs credentials retrieving function, with
	  backwards compatability from previous struct
	  format, to be used by both ext2 and mfs
	. fix for ext2 - STATICINIT was fed no.
	  of bytes instead of no. of elements, overallocating
	  memory by a megabyte or two for the superblock

servers/ext2/Makefile

@@ -6,14 +6,11 @@ SRCS=	balloc.c cache.c device.c link.c \
 	write.c ialloc.c inode.c main.c path.c \
 	super.c optset.c
 DPADD+=	${LIBSYS}
-LDADD+=	-lsys
+LDADD+= -lminixfs -lsys
 
 MAN=
 
 BINDIR?= /sbin
 INSTALLFLAGS+= -S 128k
 
-DEFAULT_NR_BUFS= 1024
-CPPFLAGS+= -DDEFAULT_NR_BUFS=${DEFAULT_NR_BUFS}
-
 .include <minix.service.mk>

servers/ext2/cache.c

@@ -17,6 +17,7 @@
 
 #include "fs.h"
 #include <minix/u64.h>
+#include <minix/libminixfs.h>
 #include <stdlib.h>
 #include <assert.h>
 #include "buf.h"
@@ -489,10 +490,12 @@ PRIVATE void rm_lru(
 /*===========================================================================*
  *				set_blocksize				     *
  *===========================================================================*/
-PUBLIC void set_blocksize(unsigned int blocksize)
+PUBLIC void set_blocksize(unsigned int blocksize, u32_t blocks,
+	u32_t freeblocks, dev_t majordev)
 {
   struct buf *bp;
   struct inode *rip;
+  int new_nr_bufs;
 
   ASSERT(blocksize > 0);
 
@@ -502,7 +505,9 @@ PUBLIC void set_blocksize(unsigned int blocksize)
   for (rip = &inode[0]; rip < &inode[NR_INODES]; rip++)
 	if (rip->i_count > 0) panic("change blocksize with inode in use");
 
-  buf_pool(nr_bufs);
+  new_nr_bufs = fs_bufs_heuristic(10, blocks, freeblocks, blocksize, majordev);
+
+  buf_pool(new_nr_bufs);
   fs_block_size = blocksize;
 }
 

servers/ext2/main.c

@@ -157,7 +157,9 @@ PRIVATE int sef_cb_init_fresh(int type, sef_init_info_t *info)
 	driver_endpoints[i].driver_e = NONE;
 
   SELF_E = getprocnr();
-  buf_pool(DEFAULT_NR_BUFS);
+
+  /* just a small number before we find out the block size at mount time */
+  buf_pool(10);
   fs_block_size = _MIN_BLOCK_SIZE;
 
   return(OK);

servers/ext2/mount.c

@@ -70,7 +70,7 @@ PUBLIC int fs_readsuper()
   }
 
   /* Fill in the super block. */
-  STATICINIT(superblock, sizeof(struct super_block));
+  STATICINIT(superblock, 1);
   if (!superblock)
 	panic("Can't allocate memory for superblock.");
   superblock->s_dev = fs_dev;	/* read_super() needs to know which dev */
@@ -125,7 +125,10 @@ PUBLIC int fs_readsuper()
   }
 
 
-  set_blocksize(superblock->s_block_size);
+  set_blocksize(superblock->s_block_size,
+  	superblock->s_blocks_count,
+	superblock->s_free_blocks_count,
+	major(fs_dev));
 
   /* Get the root inode of the mounted file system. */
   if ( (root_ip = get_inode(fs_dev, ROOT_INODE)) == NULL)  {

servers/ext2/path.c

@@ -36,10 +36,10 @@ FORWARD _PROTOTYPE( int parse_path, (ino_t dir_ino, ino_t root_ino,
  *===========================================================================*/
 PUBLIC int fs_lookup()
 {
-  cp_grant_id_t grant, grant2;
+  cp_grant_id_t grant;
   int r, r1, flags, symlinks;
   unsigned int len;
-  size_t offset = 0, path_size, cred_size;
+  size_t offset = 0, path_size;
   ino_t dir_ino, root_ino;
   struct inode *rip;
 
@@ -62,21 +62,16 @@ PUBLIC int fs_lookup()
   /* Verify this is a null-terminated path. */
   if(user_path[len - 1] != '\0') return(EINVAL);
 
-  if(flags & PATH_GET_UCRED) { /* Do we have to copy uid/gid credentials? */
-	grant2 = (cp_grant_id_t) fs_m_in.REQ_GRANT2;
-	cred_size = (size_t) fs_m_in.REQ_UCRED_SIZE;
-
-	if (cred_size > sizeof(credentials)) return(EINVAL); /* Too big. */
-	r = sys_safecopyfrom(VFS_PROC_NR, grant2, (vir_bytes) 0,
-			     (vir_bytes) &credentials, cred_size, D);
-	if (r != OK) return(r);
-
-	caller_uid = (uid_t) credentials.vu_uid;
-	caller_gid = (gid_t) credentials.vu_gid;
-  } else {
-	memset(&credentials, 0, sizeof(credentials));
-	caller_uid	= fs_m_in.REQ_UID;
-	caller_gid	= fs_m_in.REQ_GID;
+  memset(&credentials, 0, sizeof(credentials));
+  if(!(flags & PATH_GET_UCRED)) { /* Do we have to copy uid/gid credentials? */
+        caller_uid      = (uid_t) fs_m_in.REQ_UID;
+        caller_gid      = (gid_t) fs_m_in.REQ_GID;
+   } else {
+         if((r=fs_lookup_credentials(&credentials,
+               &caller_uid, &caller_gid,
+               (cp_grant_id_t) fs_m_in.REQ_GRANT2,
+               (size_t) fs_m_in.REQ_UCRED_SIZE)) != OK)
+               return r;
   }
 
   /* Lookup inode */

servers/ext2/proto.h

@@ -21,7 +21,8 @@ _PROTOTYPE( void flushall, (dev_t dev)					);
 _PROTOTYPE( struct buf *get_block, (dev_t dev, block_t block,int only_search));
 _PROTOTYPE( void invalidate, (dev_t device)				);
 _PROTOTYPE( void put_block, (struct buf *bp, int block_type)		);
-_PROTOTYPE( void set_blocksize, (unsigned int blocksize)		);
+_PROTOTYPE( void set_blocksize, (unsigned int blocksize, u32_t blocks, 
+	u32_t freeblocks, dev_t major));
 _PROTOTYPE( void rw_scattered, (dev_t dev,
 			struct buf **bufq, int bufqsize, int rw_flag)	);
 

servers/ext2/super.c

@@ -85,14 +85,17 @@ register struct super_block *sp; /* pointer to a superblock */
 	super_block_offset = opt.block_with_super * 1024;
   }
 
-  STATICINIT(ondisk_superblock, sizeof(struct super_block));
+  STATICINIT(ondisk_superblock, 1);
 
   if (!sp || !ondisk_superblock)
 	panic("can't allocate memory for super_block buffers");
 
+  printf("ext2: reading %d bytes into %d buffer\n", _MIN_BLOCK_SIZE, sizeof(*ondisk_superblock));
+
   r = block_dev_io(MFS_DEV_READ, dev, SELF_E,
 		   (char*) ondisk_superblock, cvu64(super_block_offset),
 		   _MIN_BLOCK_SIZE);
+		   
   if (r != _MIN_BLOCK_SIZE)
 	return(EINVAL);
 

servers/mfs/Makefile

@@ -6,7 +6,7 @@ SRCS=	cache.c device.c link.c \
 	write.c inode.c main.c path.c super.c
 
 DPADD+=	${LIBM} ${LIBSYS}
-LDADD+= -lsys
+LDADD+= -lminixfs  -lsys
 
 MAN=
 

servers/mfs/cache.c

@@ -19,6 +19,7 @@
 #include <sys/param.h>
 #include <stdlib.h>
 #include <assert.h>
+#include <minix/libminixfs.h>
 #include <math.h>
 #include "buf.h"
 #include "super.h"
@@ -567,52 +568,12 @@ PRIVATE void cache_resize(unsigned int blocksize, unsigned int bufs)
  *===========================================================================*/
 PRIVATE int bufs_heuristic(struct super_block *sp)
 {
-  struct vm_stats_info vsi;
-  int bufs;
-  u32_t btotal, bfree, bused, kbytes_used_fs,
-	kbytes_total_fs, kbcache, kb_fsmax;
-  u32_t kbytes_remain_mem;
+  u32_t btotal, bfree, bused;
 
-  /* but we simply need MINBUFS no matter what, and we don't
-   * want more than that if we're a memory device
-   */
-  if(major(sp->s_dev) == MEMORY_MAJOR) {
-	bufs = MINBUFS;
-	return bufs;
-  }
-
-  /* set a reasonable cache size; cache at most a certain
-   * portion of the used FS, and at most a certain %age of remaining
-   * memory
-   */
-  if((vm_info_stats(&vsi) != OK)) {
-	bufs = 1024;
-	printf("mfs: heuristic info fail: default to %d bufs\n", bufs);
-	return bufs;
-  }
-
-  kbytes_remain_mem = div64u(mul64u(vsi.vsi_free, vsi.vsi_pagesize), 1024);
-
-  /* check fs usage. */
   blockstats(&btotal, &bfree, &bused);
-  kbytes_used_fs = div64u(mul64u(bused, sp->s_block_size), 1024);
-  kbytes_total_fs = div64u(mul64u(btotal, sp->s_block_size), 1024);
 
-  /* heuristic for a desired cache size based on FS usage;
-   * but never bigger than half of the total filesystem
-   */
-  kb_fsmax = sqrt_approx(kbytes_used_fs)*40;
-  kb_fsmax = MIN(kb_fsmax, kbytes_total_fs/2);
-
-  /* heuristic for a maximum usage - 10% of remaining memory */
-  kbcache = MIN(kbytes_remain_mem/10, kb_fsmax);
-  bufs = kbcache * 1024 / sp->s_block_size;
-
-  /* but we simply need MINBUFS no matter what */
-  if(bufs < MINBUFS)
-	bufs = MINBUFS;
-
-  return bufs;
+  return fs_bufs_heuristic(MINBUFS, btotal, bfree,
+  	sp->s_block_size, major(sp->s_dev));
 }
 
 /*===========================================================================*

servers/mfs/path.c

@@ -36,10 +36,10 @@ FORWARD _PROTOTYPE( int parse_path, (ino_t dir_ino, ino_t root_ino,
  *===========================================================================*/
 PUBLIC int fs_lookup()
 {
-  cp_grant_id_t grant, grant2;
+  cp_grant_id_t grant;
   int r, r1, flags, symlinks;
   unsigned int len;
-  size_t offset = 0, path_size, cred_size;
+  size_t offset = 0, path_size;
   ino_t dir_ino, root_ino;
   struct inode *rip;
 
@@ -62,21 +62,16 @@ PUBLIC int fs_lookup()
   /* Verify this is a null-terminated path. */
   if(user_path[len - 1] != '\0') return(EINVAL);
 
-  if(flags & PATH_GET_UCRED) { /* Do we have to copy uid/gid credentials? */
-  	grant2 = (cp_grant_id_t) fs_m_in.REQ_GRANT2;
-  	cred_size = (size_t) fs_m_in.REQ_UCRED_SIZE;
-
-  	if (cred_size > sizeof(credentials)) return(EINVAL); /* Too big. */
-  	r = sys_safecopyfrom(VFS_PROC_NR, grant2, (vir_bytes) 0,
-  			     (vir_bytes) &credentials, cred_size, D);
-  	if (r != OK) return(r);
-
-  	caller_uid = credentials.vu_uid;
-  	caller_gid = credentials.vu_gid;
+  memset(&credentials, 0, sizeof(credentials));
+  if(!(flags & PATH_GET_UCRED)) { /* Do we have to copy uid/gid credentials? */
+        caller_uid      = (uid_t) fs_m_in.REQ_UID;
+        caller_gid      = (gid_t) fs_m_in.REQ_GID;
   } else {
-  	memset(&credentials, 0, sizeof(credentials));
-	caller_uid	= (uid_t) fs_m_in.REQ_UID;
-	caller_gid	= (gid_t) fs_m_in.REQ_GID;
+	  if((r=fs_lookup_credentials(&credentials,
+		&caller_uid, &caller_gid,
+		(cp_grant_id_t) fs_m_in.REQ_GRANT2,
+		(size_t) fs_m_in.REQ_UCRED_SIZE)) != OK)
+  		return r;
   }
 
   /* Lookup inode */