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[Qemu-devel] [PULL v3 08/38] block: JSON filenames and relative backing


From: Stefan Hajnoczi
Subject: [Qemu-devel] [PULL v3 08/38] block: JSON filenames and relative backing files
Date: Tue, 13 Jan 2015 13:47:46 +0000

From: Max Reitz <address@hidden>

When using a relative backing file name, qemu needs to know the
directory of the top image file. For JSON filenames, such a directory
cannot be easily determined (e.g. how do you determine the directory of
a qcow2 BDS directly on top of a quorum BDS?). Therefore, do not allow
relative filenames for the backing file of BDSs only having a JSON
filename.

Furthermore, BDS::exact_filename should be used whenever possible. If
BDS::filename is not equal to BDS::exact_filename, the former will
always be a JSON object.

Signed-off-by: Max Reitz <address@hidden>
Signed-off-by: Kevin Wolf <address@hidden>
---
 block.c               | 28 ++++++++++++++++++++++------
 block/qapi.c          |  7 ++++++-
 include/block/block.h |  5 +++--
 3 files changed, 31 insertions(+), 9 deletions(-)

diff --git a/block.c b/block.c
index 86f2faa..cf0867c 100644
--- a/block.c
+++ b/block.c
@@ -305,19 +305,28 @@ void path_combine(char *dest, int dest_size,
 
 void bdrv_get_full_backing_filename_from_filename(const char *backed,
                                                   const char *backing,
-                                                  char *dest, size_t sz)
+                                                  char *dest, size_t sz,
+                                                  Error **errp)
 {
-    if (backing[0] == '\0' || path_has_protocol(backing)) {
+    if (backing[0] == '\0' || path_has_protocol(backing) ||
+        path_is_absolute(backing))
+    {
         pstrcpy(dest, sz, backing);
+    } else if (backed[0] == '\0' || strstart(backed, "json:", NULL)) {
+        error_setg(errp, "Cannot use relative backing file names for '%s'",
+                   backed);
     } else {
         path_combine(dest, sz, backed, backing);
     }
 }
 
-void bdrv_get_full_backing_filename(BlockDriverState *bs, char *dest, size_t 
sz)
+void bdrv_get_full_backing_filename(BlockDriverState *bs, char *dest, size_t 
sz,
+                                    Error **errp)
 {
-    bdrv_get_full_backing_filename_from_filename(bs->filename, 
bs->backing_file,
-                                                 dest, sz);
+    char *backed = bs->exact_filename[0] ? bs->exact_filename : bs->filename;
+
+    bdrv_get_full_backing_filename_from_filename(backed, bs->backing_file,
+                                                 dest, sz, errp);
 }
 
 void bdrv_register(BlockDriver *bdrv)
@@ -1225,7 +1234,14 @@ int bdrv_open_backing_file(BlockDriverState *bs, QDict 
*options, Error **errp)
         QDECREF(options);
         goto free_exit;
     } else {
-        bdrv_get_full_backing_filename(bs, backing_filename, PATH_MAX);
+        bdrv_get_full_backing_filename(bs, backing_filename, PATH_MAX,
+                                       &local_err);
+        if (local_err) {
+            ret = -EINVAL;
+            error_propagate(errp, local_err);
+            QDECREF(options);
+            goto free_exit;
+        }
     }
 
     if (!bs->drv || !bs->drv->supports_backing) {
diff --git a/block/qapi.c b/block/qapi.c
index fa68ba7..a6fd6f7 100644
--- a/block/qapi.c
+++ b/block/qapi.c
@@ -214,7 +214,12 @@ void bdrv_query_image_info(BlockDriverState *bs,
         info->backing_filename = g_strdup(backing_filename);
         info->has_backing_filename = true;
         bdrv_get_full_backing_filename(bs, backing_filename2,
-                                       sizeof(backing_filename2));
+                                       sizeof(backing_filename2), &err);
+        if (err) {
+            error_propagate(errp, err);
+            qapi_free_ImageInfo(info);
+            return;
+        }
 
         if (strcmp(backing_filename, backing_filename2) != 0) {
             info->full_backing_filename =
diff --git a/include/block/block.h b/include/block/block.h
index eac9bb0..9efaa80 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -396,10 +396,11 @@ const char *bdrv_get_encrypted_filename(BlockDriverState 
*bs);
 void bdrv_get_backing_filename(BlockDriverState *bs,
                                char *filename, int filename_size);
 void bdrv_get_full_backing_filename(BlockDriverState *bs,
-                                    char *dest, size_t sz);
+                                    char *dest, size_t sz, Error **errp);
 void bdrv_get_full_backing_filename_from_filename(const char *backed,
                                                   const char *backing,
-                                                  char *dest, size_t sz);
+                                                  char *dest, size_t sz,
+                                                  Error **errp);
 int bdrv_is_snapshot(BlockDriverState *bs);
 
 int path_has_protocol(const char *path);
-- 
2.1.0




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