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Support FileStream.Length for block devices on Linux #41

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Support FileStream.Length for block devices on Linux #41

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32 changes: 32 additions & 0 deletions mono/io-layer/io.c
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,10 @@
#include <fnmatch.h>
#include <stdio.h>
#include <utime.h>
#ifdef __linux__
#include <sys/ioctl.h>
#include <linux/fs.h>
#endif

#include <mono/io-layer/wapi.h>
#include <mono/io-layer/wapi-private.h>
Expand Down Expand Up @@ -798,6 +802,34 @@ static guint32 file_getfilesize(gpointer handle, guint32 *highsize)
return(INVALID_FILE_SIZE);
}

/* fstat indicates block devices as zero-length, so go a different path */
#ifdef BLKGETSIZE64
if (S_ISBLK(statbuf.st_mode)) {
guint64 bigsize;
if (ioctl(fd, BLKGETSIZE64, &bigsize) < 0) {
#ifdef DEBUG
g_message ("%s: handle %p ioctl BLKGETSIZE64 failed: %s",
__func__, handle, strerror(errno));
#endif

_wapi_set_last_error_from_errno ();
return(INVALID_FILE_SIZE);
}

size = bigsize & 0xFFFFFFFF;
if (highsize != NULL) {
*highsize = bigsize>>32;
}

#ifdef DEBUG
g_message ("%s: Returning block device size %d/%d",
__func__, size, *highsize);
#endif

return(size);
}
#endif

#ifdef HAVE_LARGE_FILE_SUPPORT
size = statbuf.st_size & 0xFFFFFFFF;
if (highsize != NULL) {
Expand Down