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| author | Kevin Wolf <kwolf@redhat.com> | 2017-11-20 15:02:48 +0100 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2017-11-21 14:48:22 +0100 |
| commit | 1f4ad7d3b8f7162ec0471506d86f57a5d77b8f76 (patch) | |
| tree | cfe4e11087042d0c2afc34e81470933f1d5647d8 /block/block-backend.c | |
| parent | dacaa16238cc5915a609ddaab4b7f81c4bceb9ae (diff) | |
| download | qemu-1f4ad7d3b8f7162ec0471506d86f57a5d77b8f76.tar.gz | |
block: Don't request I/O permission with BDRV_O_NO_IO
'qemu-img info' makes sense even when BLK_PERM_CONSISTENT_READ cannot be
granted because of a block job in a running qemu process. It already
sets BDRV_O_NO_IO to indicate that it doesn't access the guest visible
data at all.
Check the BDRV_O_NO_IO flags in blk_new_open(), so that I/O related
permissions are not unnecessarily requested and 'qemu-img info' can work
even if BLK_PERM_CONSISTENT_READ cannot be granted.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Diffstat (limited to 'block/block-backend.c')
| -rw-r--r-- | block/block-backend.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/block/block-backend.c b/block/block-backend.c index 5836cb3087..baef8e7abc 100644 --- a/block/block-backend.c +++ b/block/block-backend.c @@ -299,7 +299,7 @@ BlockBackend *blk_new_open(const char *filename, const char *reference, { BlockBackend *blk; BlockDriverState *bs; - uint64_t perm; + uint64_t perm = 0; /* blk_new_open() is mainly used in .bdrv_create implementations and the * tools where sharing isn't a concern because the BDS stays private, so we @@ -309,9 +309,11 @@ BlockBackend *blk_new_open(const char *filename, const char *reference, * caller of blk_new_open() doesn't make use of the permissions, but they * shouldn't hurt either. We can still share everything here because the * guest devices will add their own blockers if they can't share. */ - perm = BLK_PERM_CONSISTENT_READ; - if (flags & BDRV_O_RDWR) { - perm |= BLK_PERM_WRITE; + if ((flags & BDRV_O_NO_IO) == 0) { + perm |= BLK_PERM_CONSISTENT_READ; + if (flags & BDRV_O_RDWR) { + perm |= BLK_PERM_WRITE; + } } if (flags & BDRV_O_RESIZE) { perm |= BLK_PERM_RESIZE; |