diff options
Diffstat (limited to 'fs/overlayfs/super.c')
| -rw-r--r-- | fs/overlayfs/super.c | 40 |
1 files changed, 31 insertions, 9 deletions
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c index cc8977498c48..def266b5e2a3 100644 --- a/fs/overlayfs/super.c +++ b/fs/overlayfs/super.c @@ -32,6 +32,7 @@ static struct dentry *ovl_d_real(struct dentry *dentry, const struct inode *inode) { struct dentry *real = NULL, *lower; + int err; /* It's an overlay file */ if (inode && d_inode(dentry) == inode) @@ -58,7 +59,9 @@ static struct dentry *ovl_d_real(struct dentry *dentry, * uprobes on offset within the file, so lowerdata should be available * when setting the uprobe. */ - ovl_maybe_lookup_lowerdata(dentry); + err = ovl_verify_lowerdata(dentry); + if (err) + goto bug; lower = ovl_dentry_lowerdata(dentry); if (!lower) goto bug; @@ -182,7 +185,7 @@ static void ovl_destroy_inode(struct inode *inode) static void ovl_put_super(struct super_block *sb) { - struct ovl_fs *ofs = sb->s_fs_info; + struct ovl_fs *ofs = OVL_FS(sb); if (ofs) ovl_free_fs(ofs); @@ -191,7 +194,7 @@ static void ovl_put_super(struct super_block *sb) /* Sync real dirty inodes in upper filesystem (if it exists) */ static int ovl_sync_fs(struct super_block *sb, int wait) { - struct ovl_fs *ofs = sb->s_fs_info; + struct ovl_fs *ofs = OVL_FS(sb); struct super_block *upper_sb; int ret; @@ -239,8 +242,9 @@ static int ovl_sync_fs(struct super_block *sb, int wait) */ static int ovl_statfs(struct dentry *dentry, struct kstatfs *buf) { - struct ovl_fs *ofs = dentry->d_sb->s_fs_info; - struct dentry *root_dentry = dentry->d_sb->s_root; + struct super_block *sb = dentry->d_sb; + struct ovl_fs *ofs = OVL_FS(sb); + struct dentry *root_dentry = sb->s_root; struct path path; int err; @@ -250,6 +254,8 @@ static int ovl_statfs(struct dentry *dentry, struct kstatfs *buf) if (!err) { buf->f_namelen = ofs->namelen; buf->f_type = OVERLAYFS_SUPER_MAGIC; + if (ovl_has_fsid(ofs)) + buf->f_fsid = uuid_to_fsid(sb->s_uuid.b); } return err; @@ -397,6 +403,7 @@ static int ovl_lower_dir(const char *name, struct path *path, pr_warn("fs on '%s' does not support file handles, falling back to index=off,nfs_export=off.\n", name); } + ofs->nofh |= !fh_type; /* * Decoding origin file handle is required for persistent st_ino. * Without persistent st_ino, xino=auto falls back to xino=off. @@ -770,6 +777,10 @@ static int ovl_make_workdir(struct super_block *sb, struct ovl_fs *ofs, ofs->config.index = false; pr_warn("...falling back to index=off.\n"); } + if (ovl_has_fsid(ofs)) { + ofs->config.uuid = OVL_UUID_NULL; + pr_warn("...falling back to uuid=null.\n"); + } /* * xattr support is required for persistent st_ino. * Without persistent st_ino, xino=auto falls back to xino=off. @@ -815,6 +826,7 @@ static int ovl_make_workdir(struct super_block *sb, struct ovl_fs *ofs, ofs->config.index = false; pr_warn("upper fs does not support file handles, falling back to index=off.\n"); } + ofs->nofh |= !fh_type; /* Check if upper fs has 32bit inode numbers */ if (fh_type != FILEID_INO32_GEN) @@ -1416,9 +1428,12 @@ int ovl_fill_super(struct super_block *sb, struct fs_context *fc) if (!ovl_upper_mnt(ofs)) sb->s_flags |= SB_RDONLY; - if (!ofs->config.uuid && ofs->numfs > 1) { - pr_warn("The uuid=off requires a single fs for lower and upper, falling back to uuid=on.\n"); - ofs->config.uuid = true; + if (!ovl_origin_uuid(ofs) && ofs->numfs > 1) { + pr_warn("The uuid=off requires a single fs for lower and upper, falling back to uuid=null.\n"); + ofs->config.uuid = OVL_UUID_NULL; + } else if (ovl_has_fsid(ofs) && ovl_upper_mnt(ofs)) { + /* Use per instance persistent uuid/fsid */ + ovl_init_uuid_xattr(sb, ofs, &ctx->upper); } if (!ovl_force_readonly(ofs) && ofs->config.index) { @@ -1449,8 +1464,15 @@ int ovl_fill_super(struct super_block *sb, struct fs_context *fc) ofs->config.nfs_export = false; } + /* + * Support encoding decodable file handles with nfs_export=on + * and encoding non-decodable file handles with nfs_export=off + * if all layers support file handles. + */ if (ofs->config.nfs_export) sb->s_export_op = &ovl_export_operations; + else if (!ofs->nofh) + sb->s_export_op = &ovl_export_fid_operations; /* Never override disk quota limits or use reserved space */ cap_lower(cred->cap_effective, CAP_SYS_RESOURCE); @@ -1479,7 +1501,7 @@ out_err: return err; } -static struct file_system_type ovl_fs_type = { +struct file_system_type ovl_fs_type = { .owner = THIS_MODULE, .name = "overlay", .init_fs_context = ovl_init_fs_context, |