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block: Make essential BlockDriver objects public 

There are some block drivers which are essential to QEMU and may not be
removed: These are raw, file and qcow2 (as the default non-raw format).
Make their BlockDriver objects public so they can be directly referenced
throughout the block layer without needing to call bdrv_find_format()
and having to deal with an error at runtime, while the real problem
occurred during linking (where raw, file or qcow2 were not linked into
qemu).

Cc: qemu-stable@nongnu.org
Signed-off-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz 2014-12-02 18:32:41 +01:00 committed by Kevin Wolf
parent b89689f5b2
commit 5f535a941e
5 changed files with 12 additions and 4 deletions
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2
block/qcow2.c
View File

@ -2847,7 +2847,7 @@ static QemuOptsList qcow2_create_opts = {
}
};
static BlockDriver bdrv_qcow2 = {
BlockDriver bdrv_qcow2 = {
.format_name = "qcow2",
.instance_size = sizeof(BDRVQcowState),
.bdrv_probe = qcow2_probe,

2
block/raw-posix.c
View File

@ -1684,7 +1684,7 @@ static QemuOptsList raw_create_opts = {
}
};
static BlockDriver bdrv_file = {
BlockDriver bdrv_file = {
.format_name = "file",
.protocol_name = "file",
.instance_size = sizeof(BDRVRawState),

2
block/raw-win32.c
View File

@ -540,7 +540,7 @@ static QemuOptsList raw_create_opts = {
}
};
static BlockDriver bdrv_file = {
BlockDriver bdrv_file = {
.format_name = "file",
.protocol_name = "file",
.instance_size = sizeof(BDRVRawState),

2
block/raw_bsd.c
View File

@ -235,7 +235,7 @@ static int raw_probe(const uint8_t *buf, int buf_size, const char *filename)
return 1;
}
static BlockDriver bdrv_raw = {
BlockDriver bdrv_raw = {
.format_name = "raw",
.bdrv_probe = &raw_probe,
.bdrv_reopen_prepare = &raw_reopen_prepare,

8
include/block/block_int.h
View File

@ -414,6 +414,14 @@ struct BlockDriverState {
Error *backing_blocker;
};
/* Essential block drivers which must always be statically linked into qemu, and
* which therefore can be accessed without using bdrv_find_format() */
extern BlockDriver bdrv_file;
extern BlockDriver bdrv_raw;
extern BlockDriver bdrv_qcow2;
int get_tmp_filename(char *filename, int size);
BlockDriver *bdrv_probe_all(const uint8_t *buf, int buf_size,
const char *filename);