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qemu/qemu-0.9.0-block-rw-range-c...

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diff -rup qemu-0.9.0.orig/block.c qemu-0.9.0.new/block.c
--- qemu-0.9.0.orig/block.c 2008-02-27 19:16:26.000000000 -0500
+++ qemu-0.9.0.new/block.c 2008-02-27 19:19:00.000000000 -0500
@@ -120,6 +120,60 @@ void path_combine(char *dest, int dest_s
}
}
+static int bdrv_rd_badreq_sectors(BlockDriverState *bs,
+ int64_t sector_num, int nb_sectors)
+{
+ return
+ nb_sectors < 0 ||
+ sector_num < 0 ||
+ nb_sectors > bs->total_sectors ||
+ sector_num > bs->total_sectors - nb_sectors;
+}
+
+static int bdrv_rd_badreq_bytes(BlockDriverState *bs,
+ int64_t offset, int count)
+{
+ int64_t size = bs->total_sectors << SECTOR_BITS;
+ return
+ count < 0 ||
+ size < 0 ||
+ count > size ||
+ offset > size - count;
+}
+
+static int bdrv_wr_badreq_sectors(BlockDriverState *bs,
+ int64_t sector_num, int nb_sectors)
+{
+ if (sector_num < 0 ||
+ nb_sectors < 0)
+ return 1;
+
+ if (sector_num > bs->total_sectors - nb_sectors) {
+ if (bs->autogrow)
+ bs->total_sectors = sector_num + nb_sectors;
+ else
+ return 1;
+ }
+ return 0;
+}
+
+static int bdrv_wr_badreq_bytes(BlockDriverState *bs,
+ int64_t offset, int count)
+{
+ int64_t size = bs->total_sectors << SECTOR_BITS;
+ if (count < 0 ||
+ offset < 0)
+ return 1;
+
+ if (offset > size - count) {
+ if (bs->autogrow)
+ bs->total_sectors = (offset + count + SECTOR_SIZE - 1) >> SECTOR_BITS;
+ else
+ return 1;
+ }
+ return 0;
+}
+
void bdrv_register(BlockDriver *bdrv)
{
@@ -328,6 +382,10 @@ int bdrv_open2(BlockDriverState *bs, con
bs->read_only = 0;
bs->is_temporary = 0;
bs->encrypted = 0;
+ bs->autogrow = 0;
+
+ if (flags & BDRV_O_AUTOGROW)
+ bs->autogrow = 1;
if (flags & BDRV_O_SNAPSHOT) {
BlockDriverState *bs1;
@@ -372,6 +430,7 @@ int bdrv_open2(BlockDriverState *bs, con
}
bs->drv = drv;
bs->opaque = qemu_mallocz(drv->instance_size);
+ bs->total_sectors = 0; /* driver will set if it does not do getlength */
if (bs->opaque == NULL && drv->instance_size > 0)
return -1;
/* Note: for compatibility, we open disk image files as RDWR, and
@@ -437,6 +496,7 @@ void bdrv_close(BlockDriverState *bs)
bs->drv = NULL;
/* call the change callback */
+ bs->total_sectors = 0;
bs->media_changed = 1;
if (bs->change_cb)
bs->change_cb(bs->change_opaque);
@@ -502,6 +562,8 @@ int bdrv_read(BlockDriverState *bs, int6
if (!drv)
return -ENOMEDIUM;
+ if (bdrv_rd_badreq_sectors(bs, sector_num, nb_sectors))
+ return -EDOM;
if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
memcpy(buf, bs->boot_sector_data, 512);
sector_num++;
@@ -539,6 +601,8 @@ int bdrv_write(BlockDriverState *bs, int
return -ENOMEDIUM;
if (bs->read_only)
return -EACCES;
+ if (bdrv_wr_badreq_sectors(bs, sector_num, nb_sectors))
+ return -EDOM;
if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
memcpy(bs->boot_sector_data, buf, 512);
}
@@ -661,6 +725,8 @@ int bdrv_pread(BlockDriverState *bs, int
return -ENOMEDIUM;
if (!drv->bdrv_pread)
return bdrv_pread_em(bs, offset, buf1, count1);
+ if (bdrv_rd_badreq_bytes(bs, offset, count1))
+ return -EDOM;
return drv->bdrv_pread(bs, offset, buf1, count1);
}
@@ -676,6 +742,8 @@ int bdrv_pwrite(BlockDriverState *bs, in
return -ENOMEDIUM;
if (!drv->bdrv_pwrite)
return bdrv_pwrite_em(bs, offset, buf1, count1);
+ if (bdrv_wr_badreq_bytes(bs, offset, count1))
+ return -EDOM;
return drv->bdrv_pwrite(bs, offset, buf1, count1);
}
@@ -917,6 +985,8 @@ int bdrv_write_compressed(BlockDriverSta
return -ENOMEDIUM;
if (!drv->bdrv_write_compressed)
return -ENOTSUP;
+ if (bdrv_wr_badreq_sectors(bs, sector_num, nb_sectors))
+ return -EDOM;
return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
}
@@ -1062,6 +1132,8 @@ BlockDriverAIOCB *bdrv_aio_read(BlockDri
if (!drv)
return NULL;
+ if (bdrv_rd_badreq_sectors(bs, sector_num, nb_sectors))
+ return NULL;
/* XXX: we assume that nb_sectors == 0 is suppored by the async read */
if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
@@ -1084,6 +1156,8 @@ BlockDriverAIOCB *bdrv_aio_write(BlockDr
return NULL;
if (bs->read_only)
return NULL;
+ if (bdrv_wr_badreq_sectors(bs, sector_num, nb_sectors))
+ return NULL;
if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
memcpy(bs->boot_sector_data, buf, 512);
}
diff -rup qemu-0.9.0.orig/block_int.h qemu-0.9.0.new/block_int.h
--- qemu-0.9.0.orig/block_int.h 2007-02-05 18:01:54.000000000 -0500
+++ qemu-0.9.0.new/block_int.h 2008-02-27 19:17:46.000000000 -0500
@@ -87,6 +87,7 @@ struct BlockDriverState {
int removable; /* if true, the media can be removed */
int locked; /* if true, the media cannot temporarily be ejected */
int encrypted; /* if true, the media is encrypted */
+ int autogrow; /* if true, the backing store can auto-extend to allocate new extents */
/* event callback when inserting/removing */
void (*change_cb)(void *opaque);
void *change_opaque;
diff -rup qemu-0.9.0.orig/block-qcow2.c qemu-0.9.0.new/block-qcow2.c
--- qemu-0.9.0.orig/block-qcow2.c 2007-02-05 18:01:54.000000000 -0500
+++ qemu-0.9.0.new/block-qcow2.c 2008-02-27 19:17:16.000000000 -0500
@@ -191,7 +191,7 @@ static int qcow_open(BlockDriverState *b
int len, i, shift, ret;
QCowHeader header;
- ret = bdrv_file_open(&s->hd, filename, flags);
+ ret = bdrv_file_open(&s->hd, filename, flags | BDRV_O_AUTOGROW);
if (ret < 0)
return ret;
if (bdrv_pread(s->hd, 0, &header, sizeof(header)) != sizeof(header))
diff -rup qemu-0.9.0.orig/block-qcow.c qemu-0.9.0.new/block-qcow.c
--- qemu-0.9.0.orig/block-qcow.c 2007-02-05 18:01:54.000000000 -0500
+++ qemu-0.9.0.new/block-qcow.c 2008-02-27 19:17:16.000000000 -0500
@@ -95,7 +95,7 @@ static int qcow_open(BlockDriverState *b
int len, i, shift, ret;
QCowHeader header;
- ret = bdrv_file_open(&s->hd, filename, flags);
+ ret = bdrv_file_open(&s->hd, filename, flags | BDRV_O_AUTOGROW);
if (ret < 0)
return ret;
if (bdrv_pread(s->hd, 0, &header, sizeof(header)) != sizeof(header))
diff -rup qemu-0.9.0.orig/block-vmdk.c qemu-0.9.0.new/block-vmdk.c
--- qemu-0.9.0.orig/block-vmdk.c 2007-02-05 18:01:54.000000000 -0500
+++ qemu-0.9.0.new/block-vmdk.c 2008-02-27 19:17:16.000000000 -0500
@@ -352,7 +352,7 @@ static int vmdk_open(BlockDriverState *b
uint32_t magic;
int l1_size, i, ret;
- ret = bdrv_file_open(&s->hd, filename, flags);
+ ret = bdrv_file_open(&s->hd, filename, flags | BDRV_O_AUTOGROW);
if (ret < 0)
return ret;
if (bdrv_pread(s->hd, 0, &magic, sizeof(magic)) != sizeof(magic))
diff -rup qemu-0.9.0.orig/vl.h qemu-0.9.0.new/vl.h
--- qemu-0.9.0.orig/vl.h 2008-02-27 19:16:02.000000000 -0500
+++ qemu-0.9.0.new/vl.h 2008-02-27 19:18:19.000000000 -0500
@@ -576,6 +576,7 @@ typedef struct QEMUSnapshotInfo {
use a disk image format on top of
it (default for
bdrv_file_open()) */
+#define BDRV_O_AUTOGROW 0x0040 /* Allow backing file to extend when writing past end of file */
void bdrv_init(void);
BlockDriver *bdrv_find_format(const char *format_name);
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