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9pfs: fix inode sequencing in 'synth' driver 

The 'synth' driver's root node and the 'synth' driver's first
subdirectory node falsely share the same inode number (zero), which
makes it impossible for 9p clients (i.e. 9p test cases) to distinguish
root node and first subdirectory from each other by comparing their QIDs
(which are derived by 9p server from driver's inode numbers).

Fix this issue by using prefix-increment instead of postfix-increment
operator while generating new inode numbers for subdirectories and files.

Link: https://lore.kernel.org/qemu-devel/3859307.hTDP4D0zbi@silver/
Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Message-Id: <E1nTpyU-0000yR-9o@lizzy.crudebyte.com>
This commit is contained in:
Christian Schoenebeck 2022-03-14 19:58:11 +01:00
parent 731340813f
commit 0009df31cb
1 changed files with 2 additions and 2 deletions
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4
hw/9pfs/9p-synth.c
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@ -92,7 +92,7 @@ int qemu_v9fs_synth_mkdir(V9fsSynthNode *parent, int mode,
}
}
/* Add the name */
node = v9fs_add_dir_node(parent, mode, name, NULL, synth_node_count++);
node = v9fs_add_dir_node(parent, mode, name, NULL, ++synth_node_count);
v9fs_add_dir_node(node, parent->attr->mode, "..",
parent->attr, parent->attr->inode);
v9fs_add_dir_node(node, node->attr->mode, ".",
@ -130,7 +130,7 @@ int qemu_v9fs_synth_add_file(V9fsSynthNode *parent, int mode,
mode = ((mode & 0777) | S_IFREG);
node = g_new0(V9fsSynthNode, 1);
node->attr = &node->actual_attr;
node->attr->inode = synth_node_count++;
node->attr->inode = ++synth_node_count;
node->attr->nlink = 1;
node->attr->read = read;
node->attr->write = write;