tree: https://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git M8 head: 5e7877be25361d1d622dde6656f54f4d7a5afe6e commit: d186d50786cb550af6bae5b33fbe762450fdd581 [9/31] vfs: Introduce the basic header for the new mount API's filesystem context config: i386-tinyconfig (attached as .config) compiler: gcc-7 (Debian 7.3.0-1) 7.3.0 reproduce: git checkout d186d50786cb550af6bae5b33fbe762450fdd581 # save the attached .config to linux build tree make ARCH=i386 All warnings (new ones prefixed by >>): fs/fs_context.c: In function 'vfs_new_fs_context': >> fs/fs_context.c:66:2: warning: enumeration value 'FS_CONTEXT_FOR_SUBMOUNT' not handled in switch [-Wswitch] switch (purpose) { ^~~~~~ >> fs/fs_context.c:66:2: warning: enumeration value 'FS_CONTEXT_FOR_ROOT_MOUNT' not handled in switch [-Wswitch] vim +/FS_CONTEXT_FOR_SUBMOUNT +66 fs/fs_context.c d4ea7f68 Al Viro 2018-11-04 33 d4ea7f68 Al Viro 2018-11-04 34 /** d4ea7f68 Al Viro 2018-11-04 35 * vfs_new_fs_context - Create a filesystem context. d4ea7f68 Al Viro 2018-11-04 36 * @fs_type: The filesystem type. d4ea7f68 Al Viro 2018-11-04 37 * @reference: The dentry from which this one derives (or NULL) d4ea7f68 Al Viro 2018-11-04 38 * @sb_flags: Filesystem/superblock flags (SB_*) d4ea7f68 Al Viro 2018-11-04 39 * @sb_flags_mask: Applicable members of @sb_flags d4ea7f68 Al Viro 2018-11-04 40 * @purpose: The purpose that this configuration shall be used for. d4ea7f68 Al Viro 2018-11-04 41 * d4ea7f68 Al Viro 2018-11-04 42 * Open a filesystem and create a mount context. The mount context is d4ea7f68 Al Viro 2018-11-04 43 * initialised with the supplied flags and, if a submount/automount from d4ea7f68 Al Viro 2018-11-04 44 * another superblock (referred to by @reference) is supplied, may have d4ea7f68 Al Viro 2018-11-04 45 * parameters such as namespaces copied across from that superblock. d4ea7f68 Al Viro 2018-11-04 46 */ d4ea7f68 Al Viro 2018-11-04 47 struct fs_context *vfs_new_fs_context(struct file_system_type *fs_type, d4ea7f68 Al Viro 2018-11-04 48 struct dentry *reference, d4ea7f68 Al Viro 2018-11-04 49 unsigned int sb_flags, d4ea7f68 Al Viro 2018-11-04 50 unsigned int sb_flags_mask, d4ea7f68 Al Viro 2018-11-04 51 enum fs_context_purpose purpose) d4ea7f68 Al Viro 2018-11-04 52 { d4ea7f68 Al Viro 2018-11-04 53 struct fs_context *fc; d4ea7f68 Al Viro 2018-11-04 54 int ret = -ENOMEM; d4ea7f68 Al Viro 2018-11-04 55 d4ea7f68 Al Viro 2018-11-04 56 fc = kzalloc(sizeof(struct fs_context), GFP_KERNEL); d4ea7f68 Al Viro 2018-11-04 57 if (!fc) d4ea7f68 Al Viro 2018-11-04 58 return ERR_PTR(-ENOMEM); d4ea7f68 Al Viro 2018-11-04 59 d4ea7f68 Al Viro 2018-11-04 60 fc->purpose = purpose; d4ea7f68 Al Viro 2018-11-04 61 fc->sb_flags = sb_flags; d4ea7f68 Al Viro 2018-11-04 62 fc->sb_flags_mask = sb_flags_mask; d4ea7f68 Al Viro 2018-11-04 63 fc->fs_type = get_filesystem(fs_type); d4ea7f68 Al Viro 2018-11-04 64 fc->cred = get_current_cred(); d4ea7f68 Al Viro 2018-11-04 65 d4ea7f68 Al Viro 2018-11-04 @66 switch (purpose) { d4ea7f68 Al Viro 2018-11-04 67 case FS_CONTEXT_FOR_KERNEL_MOUNT: d4ea7f68 Al Viro 2018-11-04 68 fc->sb_flags |= SB_KERNMOUNT; d4ea7f68 Al Viro 2018-11-04 69 /* Fallthrough */ d4ea7f68 Al Viro 2018-11-04 70 case FS_CONTEXT_FOR_USER_MOUNT: d4ea7f68 Al Viro 2018-11-04 71 fc->user_ns = get_user_ns(fc->cred->user_ns); d4ea7f68 Al Viro 2018-11-04 72 fc->net_ns = get_net(current->nsproxy->net_ns); d4ea7f68 Al Viro 2018-11-04 73 break; 0a21c624 Al Viro 2018-11-04 74 case FS_CONTEXT_FOR_RECONFIGURE: 0a21c624 Al Viro 2018-11-04 75 case FS_CONTEXT_FOR_UMOUNT: 0a21c624 Al Viro 2018-11-04 76 case FS_CONTEXT_FOR_EMERGENCY_RO: 0a21c624 Al Viro 2018-11-04 77 /* We don't pin any namespaces as the superblock's 0a21c624 Al Viro 2018-11-04 78 * subscriptions cannot be changed at this point. 0a21c624 Al Viro 2018-11-04 79 */ 0a21c624 Al Viro 2018-11-04 80 atomic_inc(&reference->d_sb->s_active); 0a21c624 Al Viro 2018-11-04 81 fc->root = dget(reference); 0a21c624 Al Viro 2018-11-04 82 break; d4ea7f68 Al Viro 2018-11-04 83 } d4ea7f68 Al Viro 2018-11-04 84 d4ea7f68 Al Viro 2018-11-04 85 ret = legacy_init_fs_context(fc, reference); d4ea7f68 Al Viro 2018-11-04 86 if (ret < 0) d4ea7f68 Al Viro 2018-11-04 87 goto err_fc; d4ea7f68 Al Viro 2018-11-04 88 fc->need_free = true; d4ea7f68 Al Viro 2018-11-04 89 return fc; d4ea7f68 Al Viro 2018-11-04 90 d4ea7f68 Al Viro 2018-11-04 91 err_fc: d4ea7f68 Al Viro 2018-11-04 92 put_fs_context(fc); d4ea7f68 Al Viro 2018-11-04 93 return ERR_PTR(ret); d4ea7f68 Al Viro 2018-11-04 94 } d4ea7f68 Al Viro 2018-11-04 95 EXPORT_SYMBOL(vfs_new_fs_context); d4ea7f68 Al Viro 2018-11-04 96 :::::: The code at line 66 was first introduced by commit :::::: d4ea7f68ae3c23c9442e2f6ff821aede7b8435d9 introduce fs_context, switch vfs_kern_mount() to it. :::::: TO: Al Viro <viro@xxxxxxxxxxxxxxxxxx> :::::: CC: Al Viro <viro@xxxxxxxxxxxxxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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