From 7205e4075d8b50e4dd89fe39ed03860b23cbb704 Mon Sep 17 00:00:00 2001 From: wdenk Date: Wed, 10 Sep 2003 22:30:53 +0000 Subject: * Patches by Denis Peter, 9 Sep 2003: add FAT support for IDE, SCSI and USB * Patches by Gleb Natapov, 2 Sep 2003: - cleanup of POST code for unsupported architectures - MPC824x locks way0 of data cache for use as initial RAM; this patch unlocks it after relocation to RAM and invalidates the locked entries. * Patch by Gleb Natapov, 30 Aug 2003: new I2C driver for mpc107 bridge. Now works from flash. * Patch by Dave Ellis, 11 Aug 2003: - JFFS2: fix typo in common/cmd_jffs2.c - JFFS2: fix CFG_JFFS2_SORT_FRAGMENTS option - JFFS2: remove node version 0 warning - JFFS2: accept JFFS2 PADDING nodes - SXNI855T: add AM29LV800 support - SXNI855T: move environment from EEPROM to flash - SXNI855T: boot from JFFS2 in NOR or NAND flash * Patch by Bill Hargen, 11 Aug 2003: fixes for I2C on MPC8240 - fix i2c_write routine - fix iprobe command - eliminates use of global variables, plus dead code, cleanup. --- fs/fat/fat.c | 184 ++++++++++++++++++++++++++++++++++++++++++++++------------- 1 file changed, 143 insertions(+), 41 deletions(-) (limited to 'fs/fat/fat.c') diff --git a/fs/fat/fat.c b/fs/fat/fat.c index 9f0156719e..6a6c5be016 100644 --- a/fs/fat/fat.c +++ b/fs/fat/fat.c @@ -29,6 +29,7 @@ #include #include #include +#include #if (CONFIG_COMMANDS & CFG_CMD_FAT) @@ -44,26 +45,70 @@ downcase(char *str) } } -int (*dev_block_read)(int device, __u32 blknr, __u32 blkcnt, __u8 *buffer) = 0; +static block_dev_desc_t *cur_dev = NULL; +static unsigned long part_offset = 0; +static int cur_part = 1; + +#define DOS_PART_TBL_OFFSET 0x1be +#define DOS_PART_MAGIC_OFFSET 0x1fe +#define DOS_FS_TYPE_OFFSET 0x36 int disk_read (__u32 startblock, __u32 getsize, __u8 * bufptr) { - /* FIXME we need to determine the start block of the - * partition where the DOS FS resides - */ - startblock += 32; - - if (dev_block_read) { - return dev_block_read (0, startblock, getsize, bufptr); + startblock += part_offset; + if (cur_dev == NULL) + return -1; + if (cur_dev->block_read) { + return cur_dev->block_read (cur_dev->dev, startblock, getsize, (unsigned long *)bufptr); } return -1; } int -fat_register_read (int (*block_read)(int, __u32, __u32, __u8 *)) +fat_register_device(block_dev_desc_t *dev_desc, int part_no) { - dev_block_read = block_read; + unsigned char buffer[SECTOR_SIZE]; + + if (!dev_desc->block_read) + return -1; + cur_dev=dev_desc; + /* check if we have a MBR (on floppies we have only a PBR) */ + if (dev_desc->block_read (dev_desc->dev, 0, 1, (ulong *) buffer) != 1) { + printf ("** Can't read from device %d **\n", dev_desc->dev); + return -1; + } + if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 || + buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) { + /* no signature found */ + return -1; + } + if(!strncmp(&buffer[DOS_FS_TYPE_OFFSET],"FAT",3)) { + /* ok, we assume we are on a PBR only */ + cur_part = 1; + part_offset=0; + } + else { +#if (CONFIG_COMMANDS & CFG_CMD_IDE) || (CONFIG_COMMANDS & CFG_CMD_SCSI) + disk_partition_t info; + if(!get_partition_info(dev_desc, part_no, &info)) { + part_offset = info.start; + cur_part = part_no; + } + else { + printf ("** Partition %d not valid on device %d **\n",part_no,dev_desc->dev); + return -1; + } +#else + /* FIXME we need to determine the start block of the + * partition where the DOS FS resides. This can be done + * by using the get_partition_info routine. For this + * purpose the libpart must be included. + */ + part_offset=32; + cur_part = 1; +#endif + } return 0; } @@ -246,25 +291,21 @@ get_cluster(fsdata *mydata, __u32 clustnum, __u8 *buffer, unsigned long size) } FAT_DPRINT("gc - clustnum: %d, startsect: %d\n", clustnum, startsect); - while (size > 0) { - if (size >= FS_BLOCK_SIZE) { - if (disk_read(startsect + idx, 1, buffer) < 0) { - FAT_DPRINT("Error reading data\n"); - return -1; - } - } else { - __u8 tmpbuf[FS_BLOCK_SIZE]; - if (disk_read(startsect + idx, 1, tmpbuf) < 0) { - FAT_DPRINT("Error reading data\n"); - return -1; - } - memcpy(buffer, tmpbuf, size); - - return 0; + if (disk_read(startsect, size/FS_BLOCK_SIZE , buffer) < 0) { + FAT_DPRINT("Error reading data\n"); + return -1; + } + if(size % FS_BLOCK_SIZE) { + __u8 tmpbuf[FS_BLOCK_SIZE]; + idx= size/FS_BLOCK_SIZE; + if (disk_read(startsect + idx, 1, tmpbuf) < 0) { + FAT_DPRINT("Error reading data\n"); + return -1; } - buffer += FS_BLOCK_SIZE; - size -= FS_BLOCK_SIZE; - idx++; + buffer += idx*FS_BLOCK_SIZE; + + memcpy(buffer, tmpbuf, size % FS_BLOCK_SIZE); + return 0; } return 0; @@ -283,6 +324,8 @@ get_contents(fsdata *mydata, dir_entry *dentptr, __u8 *buffer, unsigned long filesize = FAT2CPU32(dentptr->size), gotsize = 0; unsigned int bytesperclust = mydata->clust_size * SECTOR_SIZE; __u32 curclust = START(dentptr); + __u32 endclust, newclust; + unsigned long actsize; FAT_DPRINT("Filesize: %ld bytes\n", filesize); @@ -290,25 +333,56 @@ get_contents(fsdata *mydata, dir_entry *dentptr, __u8 *buffer, FAT_DPRINT("Reading: %ld bytes\n", filesize); + actsize=bytesperclust; + endclust=curclust; do { - int getsize = (filesize > bytesperclust) ? bytesperclust : - filesize; - - if (get_cluster(mydata, curclust, buffer, getsize) != 0) { + /* search for consecutive clusters */ + while(actsize < filesize) { + newclust = get_fatent(mydata, endclust); + if((newclust -1)!=endclust) + goto getit; + if (newclust <= 0x0001 || newclust >= 0xfff0) { + FAT_DPRINT("curclust: 0x%x\n", newclust); + FAT_DPRINT("Invalid FAT entry\n"); + return gotsize; + } + endclust=newclust; + actsize+= bytesperclust; + } + /* actsize >= file size */ + actsize -= bytesperclust; + /* get remaining clusters */ + if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) { FAT_ERROR("Error reading cluster\n"); return -1; } - gotsize += getsize; - filesize -= getsize; - if (filesize <= 0) return gotsize; - buffer += getsize; - - curclust = get_fatent(mydata, curclust); + /* get remaining bytes */ + gotsize += (int)actsize; + filesize -= actsize; + buffer += actsize; + actsize= filesize; + if (get_cluster(mydata, endclust, buffer, (int)actsize) != 0) { + FAT_ERROR("Error reading cluster\n"); + return -1; + } + gotsize+=actsize; + return gotsize; +getit: + if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) { + FAT_ERROR("Error reading cluster\n"); + return -1; + } + gotsize += (int)actsize; + filesize -= actsize; + buffer += actsize; + curclust = get_fatent(mydata, endclust); if (curclust <= 0x0001 || curclust >= 0xfff0) { FAT_DPRINT("curclust: 0x%x\n", curclust); FAT_ERROR("Invalid FAT entry\n"); return gotsize; } + actsize=bytesperclust; + endclust=curclust; } while (1); } @@ -641,7 +715,7 @@ static long do_fat_read (const char *filename, void *buffer, unsigned long maxsize, int dols) { - __u8 block[FS_BLOCK_SIZE]; /* Block buffer */ + __u8 block[MAX_CLUSTSIZE]; /* Block buffer */ char fnamecopy[2048]; boot_sector bs; volume_info volinfo; @@ -713,7 +787,7 @@ do_fat_read (const char *filename, void *buffer, unsigned long maxsize, while (1) { int i; - if (disk_read (cursect, 1, block) < 0) { + if (disk_read (cursect, mydata->clust_size, block) < 0) { FAT_DPRINT ("Error: reading rootdir block\n"); return -1; } @@ -880,8 +954,35 @@ file_fat_detectfs(void) boot_sector bs; volume_info volinfo; int fatsize; + char vol_label[12]; - return read_bootsectandvi(&bs, &volinfo, &fatsize); + if(cur_dev==NULL) { + printf("No current device\n"); + return 1; + } +#if (CONFIG_COMMANDS & CFG_CMD_IDE) || (CONFIG_COMMANDS & CFG_CMD_SCSI) + printf("Interface: "); + switch(cur_dev->if_type) { + case IF_TYPE_IDE : printf("IDE"); break; + case IF_TYPE_SCSI : printf("SCSI"); break; + case IF_TYPE_ATAPI : printf("ATAPI"); break; + case IF_TYPE_USB : printf("USB"); break; + case IF_TYPE_DOC : printf("DOC"); break; + case IF_TYPE_MMC : printf("MMC"); break; + default : printf("Unknown"); + } + printf("\n Device %d: ",cur_dev->dev); + dev_print(cur_dev); +#endif + if(read_bootsectandvi(&bs, &volinfo, &fatsize)) { + printf("\nNo valid FAT fs found\n"); + return 1; + } + memcpy (vol_label, volinfo.volume_label, 11); + vol_label[11] = '\0'; + volinfo.fs_type[5]='\0'; + printf("Partition %d: Filesystem: %s \"%s\"\n",cur_part,volinfo.fs_type,vol_label); + return 0; } @@ -895,6 +996,7 @@ file_fat_ls(const char *dir) long file_fat_read(const char *filename, void *buffer, unsigned long maxsize) { + printf("reading %s\n",filename); return do_fat_read(filename, buffer, maxsize, LS_NO); } -- cgit v1.2.1