aboutsummaryrefslogtreecommitdiff
path: root/block/vhdx-log.c
diff options
context:
space:
mode:
Diffstat (limited to 'block/vhdx-log.c')
-rw-r--r--block/vhdx-log.c55
1 files changed, 36 insertions, 19 deletions
diff --git a/block/vhdx-log.c b/block/vhdx-log.c
index a77c040ee0..eb5c7a097b 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);
@@ -342,14 +345,19 @@ 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;
}
desc_sectors = vhdx_compute_desc_sectors(hdr.descriptor_count);
- desc_entries = qemu_blockalign(bs, desc_sectors * VHDX_LOG_SECTOR_SIZE);
+ desc_entries = qemu_try_blockalign(bs->file,
+ desc_sectors * VHDX_LOG_SECTOR_SIZE);
+ if (desc_entries == NULL) {
+ ret = -ENOMEM;
+ goto exit;
+ }
ret = vhdx_log_read_sectors(bs, log, &sectors_read, desc_entries,
desc_sectors, false);
@@ -363,12 +371,19 @@ 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 +418,7 @@ 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;
@@ -431,10 +446,15 @@ 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;
+ } else {
+ error_report("Invalid VHDX log descriptor entry signature 0x%" PRIx32,
+ desc->signature);
+ ret = -EINVAL;
+ goto exit;
}
file_offset = desc->file_offset;
@@ -493,13 +513,13 @@ 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, &sectors_read,
data, 1, false);
@@ -510,6 +530,7 @@ 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);
@@ -558,9 +579,6 @@ 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;
}
@@ -573,13 +591,13 @@ 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;
}
@@ -602,7 +620,7 @@ 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;
}
@@ -962,7 +980,6 @@ 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, &sectors_written, buffer,
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-19 23:55:48 +0000