diff options
| author | Greg Kurz <groug@kaod.org> | 2017-02-26 23:41:48 +0100 |
|---|---|---|
| committer | Greg Kurz <groug@kaod.org> | 2017-02-28 11:21:14 +0100 |
| commit | 00c90bd1c2ff6aabb9ca948a254ba044a403e399 (patch) | |
| tree | c0d02733caf70e081ab9dbdb7b87523d556be12c /hw/9pfs/9p-local.c | |
| parent | 56fc494bdcba35d74da27e1d34dbb6db6fa7bd67 (diff) | |
9pfs: remove side-effects in local_init()
If this function fails, it should not modify *ctx.
Signed-off-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'hw/9pfs/9p-local.c')
| -rw-r--r-- | hw/9pfs/9p-local.c | 37 |
1 files changed, 19 insertions, 18 deletions
diff --git a/hw/9pfs/9p-local.c b/hw/9pfs/9p-local.c index 7de07e1ba6..4a8e628117 100644 --- a/hw/9pfs/9p-local.c +++ b/hw/9pfs/9p-local.c @@ -1168,9 +1168,25 @@ static int local_ioc_getversion(FsContext *ctx, V9fsPath *path, static int local_init(FsContext *ctx) { - int err = 0; struct statfs stbuf; +#ifdef FS_IOC_GETVERSION + /* + * use ioc_getversion only if the ioctl is definied + */ + if (statfs(ctx->fs_root, &stbuf) < 0) { + return -1; + } + switch (stbuf.f_type) { + case EXT2_SUPER_MAGIC: + case BTRFS_SUPER_MAGIC: + case REISERFS_SUPER_MAGIC: + case XFS_SUPER_MAGIC: + ctx->exops.get_st_gen = local_ioc_getversion; + break; + } +#endif + if (ctx->export_flags & V9FS_SM_PASSTHROUGH) { ctx->xops = passthrough_xattr_ops; } else if (ctx->export_flags & V9FS_SM_MAPPED) { @@ -1185,23 +1201,8 @@ static int local_init(FsContext *ctx) ctx->xops = passthrough_xattr_ops; } ctx->export_flags |= V9FS_PATHNAME_FSCONTEXT; -#ifdef FS_IOC_GETVERSION - /* - * use ioc_getversion only if the iocl is definied - */ - err = statfs(ctx->fs_root, &stbuf); - if (!err) { - switch (stbuf.f_type) { - case EXT2_SUPER_MAGIC: - case BTRFS_SUPER_MAGIC: - case REISERFS_SUPER_MAGIC: - case XFS_SUPER_MAGIC: - ctx->exops.get_st_gen = local_ioc_getversion; - break; - } - } -#endif - return err; + + return 0; } static int local_parse_opts(QemuOpts *opts, struct FsDriverEntry *fse) |