[Qemu-devel] [PATCH V2 2/5] Add WIN32 platform support for backing_file_loop_check()

[Xu Wang <cngesaint@gmail.com>]

Signed-off-by: Xu Wang <cngesaint@gmail.com>
---
 block.c | 94 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 94 insertions(+)

diff --git a/block.c b/block.c
index 53b1a01..8dc6ded 100644
--- a/block.c
+++ b/block.c
@@ -4431,6 +4431,83 @@ bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie)
     bs->total_time_ns[cookie->type] += get_clock() - cookie->start_time_ns;
 }
 
+#ifdef _WIN32
+static int get_lnk_target_file(const char *lnk_file, char *filepath)
+{
+    unsigned int flag, offet;
+    unsigned int sflag;
+    char uch;
+    int i = 0;
+
+    FILE *fd = fopen(lnk_file, "rb");
+    if (!fd) {
+        error_report("Open file %s failed.", lnk_file);
+        return -1;
+    }
+    fread(&flag, 4, 1, fd);
+    if (flag != 0x4c) {
+        error_report("%s is not a lnk file.", lnk_file);
+        fclose(fd);
+        return -1;
+    }
+    fseek(fd, 0x14, SEEK_SET);
+    fread(&flag, 4, 1, fd);
+    fseek(fd, 0x4c, SEEK_SET);
+
+    if (flag & 0x01) {
+        fread(&sflag, 2, 1, fd);
+        fseek(fd, sflag, SEEK_CUR);
+    }
+
+    offset = ftell(fd);
+    fseek(fd, offset + 0x10, SEEK_SET);
+    fread(&flag, 4, 1, fd);
+    fseek(fd, flag + offset, SEEK_SET);
+
+    do {
+        fread(&uch, 1, 1, fd);
+        filepath[i++] = uch;
+    } while (uch != '\0');
+
+    fclose(fd);
+    return 0;
+}
+
+static long get_win_inode(const char *filename)
+{
+    char pbuf[MAX_PATH_LEN], *p;
+    long inode;
+    struct stat sbuf;
+    char path[MAX_PATH_LEN];
+
+    /* If filename contains .lnk, it's a shortcuts. Target file
+ *      * need to be parsed.
+ *           */
+    if (strstr(filename, ".lnk")) {
+        if (get_lnk_target_file(filename, path)) {
+            error_report("Parse .lnk file %s failed.", filename);
+            return -1;
+        }
+    } else {
+        memcpy(path, filename, sizeof(filename));
+    }
+
+    if (stat(path, &sbuf) == -1) {
+        error_report("get file %s stat error.", path);
+        return -1;
+    }
+    if (GetFullPathName(path, MAX_PATH_LEN, pbuf, &p) != 0) {
+        inode = 11003;
+        for (p = pbuf; *p != '\0'; p++) {
+            inode = inode * 31 + *(unsigned char *)p;
+        }
+        return (inode * 911) & 0x7FFF;
+    }
+
+    return -1;
+}
+#endif
+
 static gboolean str_equal_func(gconstpointer a, gconstpointer b)
 {
     return strcmp(a, b) == 0;
@@ -4475,7 +4552,15 @@ bool bdrv_backing_file_loop_check(const char *filename, const char *fmt,
                 error_report("Get file %s stat failed.", filename);
                 goto err;
             }
+            #ifdef _WIN32
+            inode = get_win_inode(filename);
+            if (inode == -1) {
+                error_report("Get file %s inode failed.", filename);
+                goto err;
+            }
+            #else
             inode = (long)sbuf.st_ino;
+            #endif
         }
 
         filename = backing_file;
@@ -4488,7 +4573,16 @@ bool bdrv_backing_file_loop_check(const char *filename, const char *fmt,
                 error_report("Get file %s stat failed.", filename);
                 goto err;
         }
+
+        #ifdef _WIN32
+        inode = get_win_inode(filename);
+        if (inode == -1) {
+            error_report("Get file %s inode failed.", filename);
+            goto err;
+        }
+        #else
         inode = (long)sbuf.st_ino;
+        #endif
 
         if (g_hash_table_lookup_extended(inodes, &inode, NULL, NULL)) {
             error_report("Backing file '%s' creates an infinite loop.",
-- 
1.8.1.4