diff options
| -rw-r--r-- | block/block-backend.c | 23 | ||||
| -rw-r--r-- | include/sysemu/block-backend.h | 1 |
2 files changed, 17 insertions, 7 deletions
diff --git a/block/block-backend.c b/block/block-backend.c index ebdf78a11c..03e71b4368 100644 --- a/block/block-backend.c +++ b/block/block-backend.c @@ -50,6 +50,8 @@ struct BlockBackend { bool iostatus_enabled; BlockDeviceIoStatus iostatus; + bool allow_write_beyond_eof; + NotifierList remove_bs_notifiers, insert_bs_notifiers; }; @@ -579,6 +581,11 @@ void blk_iostatus_set_err(BlockBackend *blk, int error) } } +void blk_set_allow_write_beyond_eof(BlockBackend *blk, bool allow) +{ + blk->allow_write_beyond_eof = allow; +} + static int blk_check_byte_request(BlockBackend *blk, int64_t offset, size_t size) { @@ -592,17 +599,19 @@ static int blk_check_byte_request(BlockBackend *blk, int64_t offset, return -ENOMEDIUM; } - len = blk_getlength(blk); - if (len < 0) { - return len; - } - if (offset < 0) { return -EIO; } - if (offset > len || len - offset < size) { - return -EIO; + if (!blk->allow_write_beyond_eof) { + len = blk_getlength(blk); + if (len < 0) { + return len; + } + + if (offset > len || len - offset < size) { + return -EIO; + } } return 0; diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h index 66c5cf22e1..00d69baa07 100644 --- a/include/sysemu/block-backend.h +++ b/include/sysemu/block-backend.h @@ -78,6 +78,7 @@ void blk_insert_bs(BlockBackend *blk, BlockDriverState *bs); void blk_hide_on_behalf_of_hmp_drive_del(BlockBackend *blk); +void blk_set_allow_write_beyond_eof(BlockBackend *blk, bool allow); void blk_iostatus_enable(BlockBackend *blk); bool blk_iostatus_is_enabled(const BlockBackend *blk); BlockDeviceIoStatus blk_iostatus(const BlockBackend *blk); |