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dmg: fix ->open failure

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Currently the dmg image format driver simply opens the images as raw
if any kind of failure happens.  This is contrarty to the behaviour
of all other image formats which just return an error and let the
block core deal with it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Christoph Hellwig 2010-01-11 14:06:54 +01:00 committed by Anthony Liguori
parent 49e75cf388
commit 1559ca00bc
1 changed files with 14 additions and 14 deletions
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28
block/dmg.c
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@ -90,24 +90,21 @@ static int dmg_open(BlockDriverState *bs, const char *filename, int flags)
/* read offset of info blocks */
if(lseek(s->fd,-0x1d8,SEEK_END)<0) {
dmg_close:
close(s->fd);
/* open raw instead */
bs->drv=bdrv_find_format("raw");
return bs->drv->bdrv_open(bs, filename, flags);
goto fail;
}
info_begin=read_off(s->fd);
if(info_begin==0)
goto dmg_close;
goto fail;
if(lseek(s->fd,info_begin,SEEK_SET)<0)
goto dmg_close;
goto fail;
if(read_uint32(s->fd)!=0x100)
goto dmg_close;
goto fail;
if((count = read_uint32(s->fd))==0)
goto dmg_close;
goto fail;
info_end = info_begin+count;
if(lseek(s->fd,0xf8,SEEK_CUR)<0)
goto dmg_close;
goto fail;
/* read offsets */
last_in_offset = last_out_offset = 0;
@ -116,14 +113,14 @@ dmg_close:
count = read_uint32(s->fd);
if(count==0)
goto dmg_close;
goto fail;
type = read_uint32(s->fd);
if(type!=0x6d697368 || count<244)
lseek(s->fd,count-4,SEEK_CUR);
else {
int new_size, chunk_count;
if(lseek(s->fd,200,SEEK_CUR)<0)
goto dmg_close;
goto fail;
chunk_count = (count-204)/40;
new_size = sizeof(uint64_t) * (s->n_chunks + chunk_count);
s->types = qemu_realloc(s->types, new_size/2);
@ -142,7 +139,7 @@ dmg_close:
chunk_count--;
i--;
if(lseek(s->fd,36,SEEK_CUR)<0)
goto dmg_close;
goto fail;
continue;
}
read_uint32(s->fd);
@ -163,11 +160,14 @@ dmg_close:
s->compressed_chunk = qemu_malloc(max_compressed_size+1);
s->uncompressed_chunk = qemu_malloc(512*max_sectors_per_chunk);
if(inflateInit(&s->zstream) != Z_OK)
goto dmg_close;
goto fail;
s->current_chunk = s->n_chunks;
return 0;
fail:
close(s->fd);
return -1;
}
static inline int is_sector_in_chunk(BDRVDMGState* s,