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x86: Limited disk space reported by shared FS to 2GB (#574)

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This allows older MS-DOS versions to see non-zero disk space remaining
when free space is greater than 2GB.
This commit is contained in:
user7182
2022-03-20 13:44:37 -04:00
committed by GitHub
parent cc9791eea6
commit bf180ef364
1 changed files with 12 additions and 3 deletions
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15
support/x86/x86_share.cpp
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@@ -809,19 +809,28 @@ static int process_request(void *reqres_buffer)
dbg_print("> AL_DISKSPACE\n");
uint32_t total = 10;
uint32_t avail = 1;
uint32_t spc = 128;
uint32_t bps = 512;
// Set the sector size to the maximum size supported by FAT16:
// 1024 MB - 2047 MB: 64 Sectors/Cluster, 32K Cluster Size
//
// This allows for MS-DOS version that only support up to 64
// Sectors/Cluster to display a non-zero value for disk space remaning.
uint32_t spc = 64; // Sectors/Cluster (normally based on partition size)
uint32_t bps = 512; // Bytes/Sector (this value is not adjusted)
struct statvfs st;
if (!statvfs(getFullPath(basepath), &st))
{
// Calculate the size available and remaining as reported from Linux
uint64_t sz = st.f_bsize * st.f_blocks;
uint64_t av = st.f_bsize * st.f_bavail;
// Convert those values into cluster sizes.
total = sz / (bps * spc);
avail = av / (bps * spc);
}
// Limit the total and available sizes to the maximum supported size
// based on the cluster size. (In our case 2GB at 32KB clusters)
if (total > UINT16_MAX) total = UINT16_MAX;
if (avail > UINT16_MAX) avail = UINT16_MAX;