Changeset e03a733 in mainline

Timestamp:

2011-03-06T22:30:26Z (14 years ago)

Author:

Maurizio Lombardi <m.lombardi85@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

e2267e82

Parents:

ae1ae27

Message:

initialize V3 superblock and write it to disk

Location:

uspace

Files:

• app/mkminix/mkminix.c (modified) (7 diffs)
• lib/minix/minix.h (modified) (1 diff)

uspace/app/mkminix/mkminix.c

@@ -215 +215 @@
                 }
                 setup_superblock_v3(sb3, &opt);
+                block_write_direct(handle, MFS_SUPERBLOCK, 1, sb3);
                 setup_bitmaps(handle, sb3->s_ninodes,
-                                sb3->s_total_zones, sb3->s_block_size);
+                                sb3->s_nzones, sb3->s_block_size);
         } else {
                 sb = (struct mfs_superblock *) malloc(sizeof(struct mfs_superblock));
@@ -244 +245 @@
         } else {
                 fs_version = 2;
-                ino_per_block = V1_INODES_PER_BLOCK;
+                ino_per_block = V2_INODES_PER_BLOCK;
                 if (opt->fs_longnames)
                         opt->fs_magic = MFS_MAGIC_V2L;
@@ -250 +251 @@
 
         sb->s_magic = opt->fs_magic;
+
+        /*Compute the number of zones on disk*/
 
         /*Valid only for MFS V1*/
@@ -259 +262 @@
                         UINT32_MAX : opt->dev_nblocks;
 
+        /*Round up the number of inodes to fill block size*/
         if (opt->n_inodes == 0)
                 tmp = opt->dev_nblocks / 3;             
@@ -264 +268 @@
                 tmp = opt->n_inodes;
 
-        /*Round up the number of inodes to fill block size*/
         if (tmp % ino_per_block)
                 tmp = ((tmp / ino_per_block) + 1) * ino_per_block;
@@ -278 +281 @@
                 sb->s_zbmap_blocks = UPPER(sb->s_nzones2, MFS_BLOCKSIZE * 8);
 
+        /*Compute inode table size*/
+        unsigned long ninodes_blocks = sb->s_ninodes / ino_per_block;
+
         /*Compute first data zone position*/
-        unsigned long ninodes_blocks = sb->s_ninodes / (fs_version == 1 ?
-                                                        V1_INODES_PER_BLOCK :
-                                                        V2_INODES_PER_BLOCK);
         sb->s_first_data_zone = 2 + ninodes_blocks + 
                                 sb->s_zbmap_blocks + sb->s_ibmap_blocks;
@@ -293 +296 @@
         printf(NAME ": inode table blocks = %ld\n", ninodes_blocks);
         printf(NAME ": first data zone = %d\n", sb->s_first_data_zone);
+        printf(NAME ": long fnames = %s\n", opt->fs_longnames ? "Yes" : "No");
 }
 
 static void setup_superblock_v3(struct mfs3_superblock *sb, mfs_params_t *opt)
 {
+        int ino_per_block;
+        int bs;
+        aoff64_t tmp;
+
+        sb->s_magic = opt->fs_magic;
+        bs = opt->block_size;
+
+        if (opt->n_inodes == 0)
+                tmp = opt->dev_nblocks / 3;             
+        else
+                tmp = opt->n_inodes;
+
+        /*Compute the number of zones on disk*/
+        sb->s_nzones = opt->dev_nblocks > UINT32_MAX ?
+                        UINT32_MAX : opt->dev_nblocks;
+        sb->s_nzones /= (bs / MFS_MIN_BLOCKSIZE);
+
+        /*Round up the number of inodes to fill block size*/
+        ino_per_block = V3_INODES_PER_BLOCK(bs);
+        if (tmp % ino_per_block)
+                tmp = ((tmp / ino_per_block) + 1) * ino_per_block;
+        sb->s_ninodes = tmp > UINT32_MAX ? UINT32_MAX : tmp;
+
+        /*Compute inode bitmap size in blocks*/
+        sb->s_ibmap_blocks = UPPER(sb->s_ninodes, bs * 8);
+
+        /*Compute zone bitmap size in blocks*/
+        sb->s_zbmap_blocks = UPPER(sb->s_nzones, bs * 8);
+
+        /*Compute inode table size*/
+        unsigned long ninodes_blocks = sb->s_ninodes / ino_per_block;
+
+        /*Compute first data zone position*/
+        sb->s_first_data_zone = 2 + ninodes_blocks + 
+                                sb->s_zbmap_blocks + sb->s_ibmap_blocks;
+
+        /*Set log2 of zone to block ratio to zero*/
+        sb->s_log2_zone_size = 0;
+        sb->s_disk_version = 3;
+        sb->s_block_size = bs;
+
+        /*Superblock is now ready to be written on disk*/
+        printf(NAME ": %d inodes\n", sb->s_ninodes);
+        printf(NAME ": %d zones\n", sb->s_nzones);
+        printf(NAME ": block size = %d\n", sb->s_block_size);
+        printf(NAME ": inode table blocks = %ld\n", ninodes_blocks);
+        printf(NAME ": first data zone = %d\n", sb->s_first_data_zone);
 }
 

uspace/lib/minix/minix.h

@@ -119 +119 @@
         int32_t         s_max_file_size;
         /*Total number of zones on the device*/
-        uint32_t        s_total_zones;
+        uint32_t        s_nzones;
         /*
          *Magic number used to recognize MinixFS