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-rw-r--r--fs/ext2/dev.c151
1 files changed, 69 insertions, 82 deletions
diff --git a/fs/ext2/dev.c b/fs/ext2/dev.c
index 117a44984e..35a576daa8 100644
--- a/fs/ext2/dev.c
+++ b/fs/ext2/dev.c
@@ -34,109 +34,96 @@ static block_dev_desc_t *ext2fs_block_dev_desc;
static disk_partition_t part_info;
#undef DEBUG
-int ext2fs_set_blk_dev
- (
- block_dev_desc_t *rbdd,
- int part
- )
- {
- ext2fs_block_dev_desc = rbdd;
+int ext2fs_set_blk_dev (block_dev_desc_t * rbdd, int part)
+{
+ ext2fs_block_dev_desc = rbdd;
- if (part == 0)
- {
- /* disk doesn't use partition table */
- part_info.start = 0;
- part_info.size = rbdd->lba;
- part_info.blksz = rbdd->blksz;
- }
- else
- {
- if (get_partition_info (ext2fs_block_dev_desc, part, &part_info))
- {
- return 0;
- }
+ if (part == 0) {
+ /* disk doesn't use partition table */
+ part_info.start = 0;
+ part_info.size = rbdd->lba;
+ part_info.blksz = rbdd->blksz;
+ } else {
+ if (get_partition_info
+ (ext2fs_block_dev_desc, part, &part_info)) {
+ return 0;
+ }
}
- return (part_info.size);
- }
+ return (part_info.size);
+}
-int ext2fs_devread
- (
- int sector,
- int byte_offset,
- int byte_len,
- char *buf
- )
- {
- char sec_buf[SECTOR_SIZE];
- unsigned block_len;
+int ext2fs_devread (int sector, int byte_offset, int byte_len, char *buf) {
+ char sec_buf[SECTOR_SIZE];
+ unsigned block_len;
+
/*
* Check partition boundaries
*/
- if ((sector < 0) || ((sector + ((byte_offset + byte_len - 1) >> SECTOR_BITS)) >= part_info.size))
- {
-/* errnum = ERR_OUTSIDE_PART; */
- printf (" ** ext2fs_devread() read outside partition sector %d\n", sector);
- return(0);
+ if ((sector < 0)
+ || ((sector + ((byte_offset + byte_len - 1) >> SECTOR_BITS)) >=
+ part_info.size)) {
+ /* errnum = ERR_OUTSIDE_PART; */
+ printf (" ** ext2fs_devread() read outside partition sector %d\n", sector);
+ return (0);
}
/*
* Get the read to the beginning of a partition.
*/
- sector += byte_offset >> SECTOR_BITS;
- byte_offset &= SECTOR_SIZE - 1;
+ sector += byte_offset >> SECTOR_BITS;
+ byte_offset &= SECTOR_SIZE - 1;
#if defined(DEBUG)
- printf (" <%d, %d, %d>\n", sector, byte_offset, byte_len);
+ printf (" <%d, %d, %d>\n", sector, byte_offset, byte_len);
#endif
- if (ext2fs_block_dev_desc == NULL)
- {
- printf("** Invalid Block Device Descriptor (NULL)\n");
- return(0);
+ if (ext2fs_block_dev_desc == NULL) {
+ printf ("** Invalid Block Device Descriptor (NULL)\n");
+ return (0);
}
- if (byte_offset != 0)
- {
-/* read first part which isn't aligned with start of sector */
- if (ext2fs_block_dev_desc->block_read(ext2fs_block_dev_desc->dev, part_info.start+sector, 1, (unsigned long *)sec_buf) != 1)
- {
- printf (" ** ext2fs_devread() read error **\n");
- return(0);
- }
- memcpy(buf, sec_buf+byte_offset, min(SECTOR_SIZE-byte_offset, byte_len));
- buf+=min(SECTOR_SIZE-byte_offset, byte_len);
- byte_len-=min(SECTOR_SIZE-byte_offset, byte_len);
- sector++;
+ if (byte_offset != 0) {
+ /* read first part which isn't aligned with start of sector */
+ if (ext2fs_block_dev_desc->
+ block_read (ext2fs_block_dev_desc->dev,
+ part_info.start + sector, 1,
+ (unsigned long *) sec_buf) != 1) {
+ printf (" ** ext2fs_devread() read error **\n");
+ return (0);
+ }
+ memcpy (buf, sec_buf + byte_offset,
+ min (SECTOR_SIZE - byte_offset, byte_len));
+ buf += min (SECTOR_SIZE - byte_offset, byte_len);
+ byte_len -= min (SECTOR_SIZE - byte_offset, byte_len);
+ sector++;
}
-/* read sector aligned part */
- block_len = byte_len & ~(SECTOR_SIZE-1);
- if (ext2fs_block_dev_desc->block_read(ext2fs_block_dev_desc->dev,
- part_info.start+sector,
- block_len/SECTOR_SIZE,
- (unsigned long *)buf) != block_len/SECTOR_SIZE)
- {
- printf (" ** ext2fs_devread() read error - block\n");
- return(0);
+ /* read sector aligned part */
+ block_len = byte_len & ~(SECTOR_SIZE - 1);
+ if (ext2fs_block_dev_desc->block_read (ext2fs_block_dev_desc->dev,
+ part_info.start + sector,
+ block_len / SECTOR_SIZE,
+ (unsigned long *) buf) !=
+ block_len / SECTOR_SIZE) {
+ printf (" ** ext2fs_devread() read error - block\n");
+ return (0);
}
- buf+=block_len;
- byte_len-=block_len;
- sector+= block_len/SECTOR_SIZE;
+ buf += block_len;
+ byte_len -= block_len;
+ sector += block_len / SECTOR_SIZE;
- if (byte_len != 0)
- {
-/* read rest of data which are not in whole sector */
- if (ext2fs_block_dev_desc->block_read(ext2fs_block_dev_desc->dev,
- part_info.start+sector,
- 1,
- (unsigned long *)sec_buf) != 1)
- {
- printf (" ** ext2fs_devread() read error - last part\n");
- return(0);
- }
- memcpy(buf, sec_buf, byte_len);
+ if (byte_len != 0) {
+ /* read rest of data which are not in whole sector */
+ if (ext2fs_block_dev_desc->
+ block_read (ext2fs_block_dev_desc->dev,
+ part_info.start + sector, 1,
+ (unsigned long *) sec_buf) != 1) {
+ printf (" ** ext2fs_devread() read error - last part\n");
+ return (0);
+ }
+ memcpy (buf, sec_buf, byte_len);
}
- return(1);
- }
+ return (1);
+}
#endif /* CFG_CMD_EXT2FS */
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