diff options
Diffstat (limited to 'block/vhdx-log.c')
| -rw-r--r-- | block/vhdx-log.c | 43 |
1 files changed, 25 insertions, 18 deletions
diff --git a/block/vhdx-log.c b/block/vhdx-log.c index 7c2630d659..0088be8747 100644 --- a/block/vhdx-log.c +++ b/block/vhdx-log.c @@ -84,6 +84,7 @@ static int vhdx_log_peek_hdr(BlockDriverState *bs, VHDXLogEntries *log, if (ret < 0) { goto exit; } + vhdx_log_entry_hdr_le_import(hdr); exit: return ret; @@ -211,7 +212,7 @@ static bool vhdx_log_hdr_is_valid(VHDXLogEntries *log, VHDXLogEntryHeader *hdr, { int valid = false; - if (memcmp(&hdr->signature, "loge", 4)) { + if (hdr->signature != VHDX_LOG_SIGNATURE) { goto exit; } @@ -275,12 +276,12 @@ static bool vhdx_log_desc_is_valid(VHDXLogDescriptor *desc, goto exit; } - if (!memcmp(&desc->signature, "zero", 4)) { + if (desc->signature == VHDX_LOG_ZERO_SIGNATURE) { if (desc->zero_length % VHDX_LOG_SECTOR_SIZE == 0) { /* valid */ ret = true; } - } else if (!memcmp(&desc->signature, "desc", 4)) { + } else if (desc->signature == VHDX_LOG_DESC_SIGNATURE) { /* valid */ ret = true; } @@ -327,13 +328,15 @@ static int vhdx_compute_desc_sectors(uint32_t desc_cnt) * passed into this function. Each descriptor will also be validated, * and error returned if any are invalid. */ static int vhdx_log_read_desc(BlockDriverState *bs, BDRVVHDXState *s, - VHDXLogEntries *log, VHDXLogDescEntries **buffer) + VHDXLogEntries *log, VHDXLogDescEntries **buffer, + bool convert_endian) { int ret = 0; uint32_t desc_sectors; uint32_t sectors_read; VHDXLogEntryHeader hdr; VHDXLogDescEntries *desc_entries = NULL; + VHDXLogDescriptor desc; int i; assert(*buffer == NULL); @@ -342,7 +345,7 @@ static int vhdx_log_read_desc(BlockDriverState *bs, BDRVVHDXState *s, if (ret < 0) { goto exit; } - vhdx_log_entry_hdr_le_import(&hdr); + if (vhdx_log_hdr_is_valid(log, &hdr, s) == false) { ret = -EINVAL; goto exit; @@ -363,12 +366,19 @@ static int vhdx_log_read_desc(BlockDriverState *bs, BDRVVHDXState *s, /* put in proper endianness, and validate each desc */ for (i = 0; i < hdr.descriptor_count; i++) { - vhdx_log_desc_le_import(&desc_entries->desc[i]); - if (vhdx_log_desc_is_valid(&desc_entries->desc[i], &hdr) == false) { + desc = desc_entries->desc[i]; + vhdx_log_desc_le_import(&desc); + if (convert_endian) { + desc_entries->desc[i] = desc; + } + if (vhdx_log_desc_is_valid(&desc, &hdr) == false) { ret = -EINVAL; goto free_and_exit; } } + if (convert_endian) { + desc_entries->hdr = hdr; + } *buffer = desc_entries; goto exit; @@ -403,7 +413,7 @@ static int vhdx_log_flush_desc(BlockDriverState *bs, VHDXLogDescriptor *desc, buffer = qemu_blockalign(bs, VHDX_LOG_SECTOR_SIZE); - if (!memcmp(&desc->signature, "desc", 4)) { + if (desc->signature == VHDX_LOG_DESC_SIGNATURE) { /* data sector */ if (data == NULL) { ret = -EFAULT; @@ -431,7 +441,7 @@ static int vhdx_log_flush_desc(BlockDriverState *bs, VHDXLogDescriptor *desc, memcpy(buffer+offset, &desc->trailing_bytes, 4); - } else if (!memcmp(&desc->signature, "zero", 4)) { + } else if (desc->signature == VHDX_LOG_ZERO_SIGNATURE) { /* write 'count' sectors of sector */ memset(buffer, 0, VHDX_LOG_SECTOR_SIZE); count = desc->zero_length / VHDX_LOG_SECTOR_SIZE; @@ -498,13 +508,13 @@ static int vhdx_log_flush(BlockDriverState *bs, BDRVVHDXState *s, goto exit; } - ret = vhdx_log_read_desc(bs, s, &logs->log, &desc_entries); + ret = vhdx_log_read_desc(bs, s, &logs->log, &desc_entries, true); if (ret < 0) { goto exit; } for (i = 0; i < desc_entries->hdr.descriptor_count; i++) { - if (!memcmp(&desc_entries->desc[i].signature, "desc", 4)) { + if (desc_entries->desc[i].signature == VHDX_LOG_DESC_SIGNATURE) { /* data sector, so read a sector to flush */ ret = vhdx_log_read_sectors(bs, &logs->log, §ors_read, data, 1, false); @@ -515,6 +525,7 @@ static int vhdx_log_flush(BlockDriverState *bs, BDRVVHDXState *s, ret = -EINVAL; goto exit; } + vhdx_log_data_le_import(data); } ret = vhdx_log_flush_desc(bs, &desc_entries->desc[i], data); @@ -563,9 +574,6 @@ static int vhdx_validate_log_entry(BlockDriverState *bs, BDRVVHDXState *s, goto inc_and_exit; } - vhdx_log_entry_hdr_le_import(&hdr); - - if (vhdx_log_hdr_is_valid(log, &hdr, s) == false) { goto inc_and_exit; } @@ -578,13 +586,13 @@ static int vhdx_validate_log_entry(BlockDriverState *bs, BDRVVHDXState *s, desc_sectors = vhdx_compute_desc_sectors(hdr.descriptor_count); - /* Read desc sectors, and calculate log checksum */ + /* Read all log sectors, and calculate log checksum */ total_sectors = hdr.entry_length / VHDX_LOG_SECTOR_SIZE; /* read_desc() will increment the read idx */ - ret = vhdx_log_read_desc(bs, s, log, &desc_buffer); + ret = vhdx_log_read_desc(bs, s, log, &desc_buffer, false); if (ret < 0) { goto free_and_exit; } @@ -607,7 +615,7 @@ static int vhdx_validate_log_entry(BlockDriverState *bs, BDRVVHDXState *s, } } crc ^= 0xffffffff; - if (crc != desc_buffer->hdr.checksum) { + if (crc != hdr.checksum) { goto free_and_exit; } @@ -967,7 +975,6 @@ static int vhdx_log_write(BlockDriverState *bs, BDRVVHDXState *s, * last data sector */ vhdx_update_checksum(buffer, total_length, offsetof(VHDXLogEntryHeader, checksum)); - cpu_to_le32s((uint32_t *)(buffer + 4)); /* now write to the log */ ret = vhdx_log_write_sectors(bs, &s->log, §ors_written, buffer, |