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| author | Jeff Cody <jcody@redhat.com> | 2013-10-30 10:44:47 -0400 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2013-11-07 13:58:59 +0100 |
| commit | 8adc52336d9c44ab4c7b9358a7be22ac0ef962bf (patch) | |
| tree | 65cfb1879270b64b35e88d8e5ba155646b5feb26 /block/vhdx.h | |
| parent | 1a848fd4517820981b542e0d10e64c0426414229 (diff) | |
| download | qemu-8adc52336d9c44ab4c7b9358a7be22ac0ef962bf.tar.gz | |
block: vhdx - add log write support
This adds support for writing to the VHDX log.
For spec details, see VHDX Specification Format v1.00:
https://www.microsoft.com/en-us/download/details.aspx?id=34750
There are a few limitations to this log support:
1.) There is no caching yet
2.) The log is flushed after each entry
The primary write interface, vhdx_log_write_and_flush(), performs a log
write followed by an immediate flush of the log.
As each log entry sector is a minimum of 4KB, partial sector writes are
filled in with data from the disk write destination.
If the current file log GUID is 0, a new GUID is generated and updated
in the header.
Signed-off-by: Jeff Cody <jcody@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'block/vhdx.h')
| -rw-r--r-- | block/vhdx.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/block/vhdx.h b/block/vhdx.h index d9065595fc..6abbf5090b 100644 --- a/block/vhdx.h +++ b/block/vhdx.h @@ -398,6 +398,9 @@ bool vhdx_checksum_is_valid(uint8_t *buf, size_t size, int crc_offset); int vhdx_parse_log(BlockDriverState *bs, BDRVVHDXState *s, bool *flushed); +int vhdx_log_write_and_flush(BlockDriverState *bs, BDRVVHDXState *s, + void *data, uint32_t length, uint64_t offset); + static inline void leguid_to_cpus(MSGUID *guid) { le32_to_cpus(&guid->data1); |