Changes in uspace/app/mkfat/mkfat.c [51d0ee9:991f645] in mainline

File:

• uspace/app/mkfat/mkfat.c (modified) (23 diffs)

uspace/app/mkfat/mkfat.c

@@ -35 +35 @@
  * @brief       Tool for creating new FAT file systems.
  *
- * Currently we can create 12/16/32-bit FAT.
+ * Currently we can only create 16-bit FAT.
  */
 
@@ -42 +42 @@
 #include <libblock.h>
 #include <mem.h>
-#include <loc.h>
+#include <devmap.h>
 #include <byteorder.h>
 #include <sys/types.h>
@@ -55 +55 @@
 #define div_round_up(a, b) (((a) + (b) - 1) / (b))
 
-/** Default file-system parameters */
+/** Predefined file-system parameters */
 enum {
-        default_sector_size             = 512,
-        default_sectors_per_cluster     = 4,
-        default_fat_count               = 2,
-        default_reserved_clusters       = 2,
-        default_media_descriptor        = 0xF8 /**< fixed disk */
+        sector_size             = 512,
+        sectors_per_cluster     = 8,
+        fat_count               = 2,
+        reserved_clusters       = 2,
+        media_descriptor        = 0xF8 /**< fixed disk */
 };
 
 /** Configurable file-system parameters */
 typedef struct fat_cfg {
-        int fat_type; /* FAT12 = 12, FAT16 = 16, FAT32 = 32 */
-        size_t sector_size;
         uint32_t total_sectors;
         uint16_t root_ent_max;
-        uint32_t addt_res_sectors;
-        uint8_t sectors_per_cluster;
-
+        uint16_t addt_res_sectors;
+} fat_cfg_t;
+
+/** Derived file-system parameters */
+typedef struct fat_params {
+        struct fat_cfg cfg;
         uint16_t reserved_sectors;
-        uint32_t rootdir_sectors;
+        uint16_t rootdir_sectors;
         uint32_t fat_sectors;
-        uint32_t total_clusters;
-        uint8_t fat_count;
-} fat_cfg_t;
+        uint16_t total_clusters;
+} fat_params_t;
 
 static void syntax_print(void);
 
-static int fat_params_compute(struct fat_cfg *cfg);
-static int fat_blocks_write(struct fat_cfg const *cfg, service_id_t service_id);
-static void fat_bootsec_create(struct fat_cfg const *cfg, struct fat_bs *bs);
+static int fat_params_compute(struct fat_cfg const *cfg,
+    struct fat_params *par);
+static int fat_blocks_write(struct fat_params const *par,
+    devmap_handle_t handle);
+static void fat_bootsec_create(struct fat_params const *par, struct fat_bs *bs);
 
 int main(int argc, char **argv)
 {
+        struct fat_params par;
         struct fat_cfg cfg;
 
         int rc;
         char *dev_path;
-        service_id_t service_id;
+        devmap_handle_t handle;
+        size_t block_size;
         char *endptr;
         aoff64_t dev_nblocks;
 
-        cfg.sector_size = default_sector_size;
-        cfg.sectors_per_cluster = default_sectors_per_cluster;
-        cfg.fat_count = default_fat_count;
         cfg.total_sectors = 0;
         cfg.addt_res_sectors = 0;
         cfg.root_ent_max = 128;
-        cfg.fat_type = FAT16;
 
         if (argc < 2) {
@@ -111 +111 @@
 
         --argc; ++argv;
+
         if (str_cmp(*argv, "--size") == 0) {
                 --argc; ++argv;
@@ -129 +130 @@
         }
 
-        if (str_cmp(*argv, "--type") == 0) {
-                --argc; ++argv;
-                if (*argv == NULL) {
-                        printf(NAME ": Error, argument missing.\n");
-                        syntax_print();
-                        return 1;
-                }
-
-                cfg.fat_type = strtol(*argv, &endptr, 10);
-                if (*endptr != '\0') {
-                        printf(NAME ": Error, invalid argument.\n");
-                        syntax_print();
-                        return 1;
-                }
-
-                --argc; ++argv;
-        }
-
         if (argc != 1) {
                 printf(NAME ": Error, unexpected argument.\n");
@@ -154 +137 @@
 
         dev_path = *argv;
-        printf("Device: %s\n", dev_path);
-
-        rc = loc_service_get_id(dev_path, &service_id, 0);
+
+        rc = devmap_device_get_handle(dev_path, &handle, 0);
         if (rc != EOK) {
                 printf(NAME ": Error resolving device `%s'.\n", dev_path);
@@ -162 +144 @@
         }
 
-        rc = block_init(EXCHANGE_SERIALIZE, service_id, 2048);
+        rc = block_init(handle, 2048);
         if (rc != EOK)  {
                 printf(NAME ": Error initializing libblock.\n");
@@ -168 +150 @@
         }
 
-        rc = block_get_bsize(service_id, &cfg.sector_size);
+        rc = block_get_bsize(handle, &block_size);
         if (rc != EOK) {
                 printf(NAME ": Error determining device block size.\n");
@@ -174 +156 @@
         }
 
-        rc = block_get_nblocks(service_id, &dev_nblocks);
+        rc = block_get_nblocks(handle, &dev_nblocks);
         if (rc != EOK) {
                 printf(NAME ": Warning, failed to obtain block device size.\n");
@@ -180 +162 @@
                 printf(NAME ": Block device has %" PRIuOFF64 " blocks.\n",
                     dev_nblocks);
-                if (!cfg.total_sectors || dev_nblocks < cfg.total_sectors)
-                        cfg.total_sectors = dev_nblocks;
+                cfg.total_sectors = dev_nblocks;
+        }
+
+        if (block_size != 512) {
+                printf(NAME ": Error. Device block size is not 512 bytes.\n");
+                return 2;
         }
 
@@ -189 +175 @@
         }
 
-        if (cfg.fat_type != FAT12 && cfg.fat_type != FAT16 && cfg.fat_type != FAT32) {
-                printf(NAME ": Error. Unknown FAT type.\n");
-                return 2;
-        }
-
-        printf(NAME ": Creating FAT%d filesystem on device %s.\n", cfg.fat_type, dev_path);
-
-        rc = fat_params_compute(&cfg);
+        printf(NAME ": Creating FAT filesystem on device %s.\n", dev_path);
+
+        rc = fat_params_compute(&cfg, &par);
         if (rc != EOK) {
                 printf(NAME ": Invalid file-system parameters.\n");
@@ -202 +183 @@
         }
 
-        rc = fat_blocks_write(&cfg, service_id);
+        rc = fat_blocks_write(&par, handle);
         if (rc != EOK) {
                 printf(NAME ": Error writing device.\n");
@@ -208 +189 @@
         }
 
-        block_fini(service_id);
+        block_fini(handle);
         printf("Success.\n");
 
@@ -216 +197 @@
 static void syntax_print(void)
 {
-        printf("syntax: mkfat [--size <sectors>] [--type 12|16|32] <device_name>\n");
+        printf("syntax: mkfat [--size <num_blocks>] <device_name>\n");
 }
 
@@ -224 +205 @@
  * file system params.
  */
-static int fat_params_compute(struct fat_cfg *cfg)
+static int fat_params_compute(struct fat_cfg const *cfg, struct fat_params *par)
 {
         uint32_t fat_bytes;
@@ -230 +211 @@
 
         /*
-         * Make a conservative guess on the FAT size needed for the file
-         * system. The optimum could be potentially smaller since we
-         * do not subtract size of the FAT itself when computing the
-         * size of the data region.
-         */
-
-        cfg->reserved_sectors = 1 + cfg->addt_res_sectors;
-        if (cfg->fat_type != FAT32) {
-                cfg->rootdir_sectors = div_round_up(cfg->root_ent_max * DIRENT_SIZE,
-                        cfg->sector_size);
-        } else
-                cfg->rootdir_sectors = 0;
-        non_data_sectors_lb = cfg->reserved_sectors + cfg->rootdir_sectors;
-
-        cfg->total_clusters = div_round_up(cfg->total_sectors - non_data_sectors_lb,
-            cfg->sectors_per_cluster);
-
-        if ((cfg->fat_type == FAT12 && cfg->total_clusters > FAT12_CLST_MAX) ||
-            (cfg->fat_type == FAT16 && (cfg->total_clusters <= FAT12_CLST_MAX ||
-            cfg->total_clusters > FAT16_CLST_MAX)) ||
-            (cfg->fat_type == FAT32 && cfg->total_clusters <= FAT16_CLST_MAX))
-                return ENOSPC;
-
-        fat_bytes = div_round_up((cfg->total_clusters + 2) *
-            FAT_CLUSTER_DOUBLE_SIZE(cfg->fat_type), 2);
-        cfg->fat_sectors = div_round_up(fat_bytes, cfg->sector_size);
+         * Make a conservative guess on the FAT size needed for the file
+         * system. The optimum could be potentially smaller since we
+         * do not subtract size of the FAT itself when computing the
+         * size of the data region.
+         */
+
+        par->reserved_sectors = 1 + cfg->addt_res_sectors;
+        par->rootdir_sectors = div_round_up(cfg->root_ent_max * DIRENT_SIZE,
+            sector_size);
+        non_data_sectors_lb = par->reserved_sectors + par->rootdir_sectors;
+
+        par->total_clusters = div_round_up(cfg->total_sectors - non_data_sectors_lb,
+            sectors_per_cluster);
+
+        fat_bytes = (par->total_clusters + 2) * 2;
+        par->fat_sectors = div_round_up(fat_bytes, sector_size);
+
+        par->cfg = *cfg;
 
         return EOK;
@@ -261 +234 @@
 
 /** Create file system with the given parameters. */
-static int fat_blocks_write(struct fat_cfg const *cfg, service_id_t service_id)
+static int fat_blocks_write(struct fat_params const *par, devmap_handle_t handle)
 {
         aoff64_t addr;
@@ -270 +243 @@
         struct fat_bs bs;
 
-        fat_bootsec_create(cfg, &bs);
-
-        rc = block_write_direct(service_id, BS_BLOCK, 1, &bs);
+        fat_bootsec_create(par, &bs);
+
+        rc = block_write_direct(handle, BS_BLOCK, 1, &bs);
         if (rc != EOK)
                 return EIO;
@@ -278 +251 @@
         addr = BS_BLOCK + 1;
 
-        buffer = calloc(cfg->sector_size, 1);
+        buffer = calloc(sector_size, 1);
         if (buffer == NULL)
                 return ENOMEM;
-        memset(buffer, 0, cfg->sector_size);
 
         /* Reserved sectors */
-        for (i = 0; i < cfg->reserved_sectors - 1; ++i) {
-                rc = block_write_direct(service_id, addr, 1, buffer);
+        for (i = 0; i < par->reserved_sectors - 1; ++i) {
+                rc = block_write_direct(handle, addr, 1, buffer);
                 if (rc != EOK)
                         return EIO;
@@ -293 +265 @@
 
         /* File allocation tables */
-        for (i = 0; i < cfg->fat_count; ++i) {
+        for (i = 0; i < fat_count; ++i) {
                 printf("Writing allocation table %d.\n", i + 1);
 
-                for (j = 0; j < cfg->fat_sectors; ++j) {
-                        memset(buffer, 0, cfg->sector_size);
+                for (j = 0; j < par->fat_sectors; ++j) {
+                        memset(buffer, 0, sector_size);
                         if (j == 0) {
-                                buffer[0] = default_media_descriptor;
+                                buffer[0] = media_descriptor;
                                 buffer[1] = 0xFF;
                                 buffer[2] = 0xFF;
-                                if (cfg->fat_type == FAT16) {
-                                        buffer[3] = 0xFF;
-                                } else if (cfg->fat_type == FAT32) {
-                                        buffer[3] = 0x0F;
-                                        buffer[4] = 0xFF;
-                                        buffer[5] = 0xFF;
-                                        buffer[6] = 0xFF;
-                                        buffer[7] = 0x0F;
-                                        buffer[8] = 0xF8;
-                                        buffer[9] = 0xFF;
-                                        buffer[10] = 0xFF;
-                                        buffer[11] = 0x0F;
-                                }
+                                buffer[3] = 0xFF;
                         }
 
-                        rc = block_write_direct(service_id, addr, 1, buffer);
+                        rc = block_write_direct(handle, addr, 1, buffer);
                         if (rc != EOK)
                                 return EIO;
@@ -325 +285 @@
         }
 
+        printf("Writing root directory.\n");
+
+        memset(buffer, 0, sector_size);
+
         /* Root directory */
-        printf("Writing root directory.\n");
-        memset(buffer, 0, cfg->sector_size);
-        if (cfg->fat_type != FAT32) {
-                size_t idx;
-                for (idx = 0; idx < cfg->rootdir_sectors; ++idx) {
-                        rc = block_write_direct(service_id, addr, 1, buffer);
-                        if (rc != EOK)
-                                return EIO;
-
-                        ++addr;
-                }
-        } else {
-                for (i = 0; i < cfg->sectors_per_cluster; i++) {
-                        rc = block_write_direct(service_id, addr, 1, buffer);
-                        if (rc != EOK)
-                                return EIO;
-
-                        ++addr;
-                }       
+        for (i = 0; i < par->rootdir_sectors; ++i) {
+                rc = block_write_direct(handle, addr, 1, buffer);
+                if (rc != EOK)
+                        return EIO;
+
+                ++addr;
         }
 
@@ -353 +304 @@
 
 /** Construct boot sector with the given parameters. */
-static void fat_bootsec_create(struct fat_cfg const *cfg, struct fat_bs *bs)
+static void fat_bootsec_create(struct fat_params const *par, struct fat_bs *bs)
 {
         memset(bs, 0, sizeof(*bs));
@@ -364 +315 @@
 
         /* BIOS Parameter Block */
-        bs->bps = host2uint16_t_le(cfg->sector_size);
-        bs->spc = cfg->sectors_per_cluster;
-        bs->rscnt = host2uint16_t_le(cfg->reserved_sectors);
-        bs->fatcnt = cfg->fat_count;
-        bs->root_ent_max = host2uint16_t_le(cfg->root_ent_max);
-
-        if (cfg->total_sectors < 0x10000) {
-                bs->totsec16 = host2uint16_t_le(cfg->total_sectors);
-                bs->totsec32 = 0;
-        } else {
-                bs->totsec16 = 0;
-                bs->totsec32 = host2uint32_t_le(cfg->total_sectors);
-        }
-
-        bs->mdesc = default_media_descriptor;
+        bs->bps = host2uint16_t_le(sector_size);
+        bs->spc = sectors_per_cluster;
+        bs->rscnt = host2uint16_t_le(par->reserved_sectors);
+        bs->fatcnt = fat_count;
+        bs->root_ent_max = host2uint16_t_le(par->cfg.root_ent_max);
+
+        if (par->cfg.total_sectors < 0x10000)
+                bs->totsec16 = host2uint16_t_le(par->cfg.total_sectors);
+        else
+                bs->totsec16 = host2uint16_t_le(0);
+
+        bs->mdesc = media_descriptor;
+        bs->sec_per_fat = host2uint16_t_le(par->fat_sectors);
         bs->sec_per_track = host2uint16_t_le(63);
-        bs->signature = host2uint16_t_be(0x55AA);
         bs->headcnt = host2uint16_t_le(6);
         bs->hidden_sec = host2uint32_t_le(0);
 
-        if (cfg->fat_type == FAT32) {
-                bs->sec_per_fat = 0;
-                bs->fat32.sectors_per_fat = host2uint32_t_le(cfg->fat_sectors);
-
-                bs->fat32.pdn = 0x80;
-                bs->fat32.ebs = 0x29;
-                bs->fat32.id = host2uint32_t_be(0x12345678);
-                bs->fat32.root_cluster = 2;
-
-                memcpy(bs->fat32.label, "HELENOS_NEW", 11);
-                memcpy(bs->fat32.type, "FAT32   ", 8);
-        } else {
-                bs->sec_per_fat = host2uint16_t_le(cfg->fat_sectors);
-                bs->pdn = 0x80;
-                bs->ebs = 0x29;
-                bs->id = host2uint32_t_be(0x12345678);
-
-                memcpy(bs->label, "HELENOS_NEW", 11);
-                memcpy(bs->type, "FAT   ", 8);
-        }
+        if (par->cfg.total_sectors >= 0x10000)
+                bs->totsec32 = host2uint32_t_le(par->cfg.total_sectors);
+        else
+                bs->totsec32 = host2uint32_t_le(0);
+
+        /* Extended BPB */
+        bs->pdn = 0x80;
+        bs->ebs = 0x29;
+        bs->id = host2uint32_t_be(0x12345678);
+
+        memcpy(bs->label, "HELENOS_NEW", 11);
+        memcpy(bs->type, "FAT16   ", 8);
+        bs->signature = host2uint16_t_be(0x55AA);
 }