Using vfs_{get,set}xattr() for fscaps will be blocked in a future
commit, so convert ovl to use the new interfaces. Also remove the now
unused ovl_getxattr_value().Reviewed-by: Amir Goldstein <[email protected]> Signed-off-by: Seth Forshee (DigitalOcean) <[email protected]> --- fs/overlayfs/copy_up.c | 72 ++++++++++++++++++++++++++------------------------ 1 file changed, 37 insertions(+), 35 deletions(-) diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c index b8e25ca51016..d7c8d76e2394 100644 --- a/fs/overlayfs/copy_up.c +++ b/fs/overlayfs/copy_up.c @@ -73,6 +73,23 @@ static int ovl_copy_acl(struct ovl_fs *ofs, const struct path *path, return err; } +static int ovl_copy_fscaps(struct ovl_fs *ofs, const struct path *oldpath, + struct dentry *new) +{ + struct vfs_caps capability; + int err; + + err = vfs_get_fscaps(mnt_idmap(oldpath->mnt), oldpath->dentry, + &capability); + if (err) { + if (err == -ENODATA || err == -EOPNOTSUPP) + return 0; + return err; + } + + return vfs_set_fscaps(ovl_upper_mnt_idmap(ofs), new, &capability, 0); +} + int ovl_copy_xattr(struct super_block *sb, const struct path *oldpath, struct dentry *new) { struct dentry *old = oldpath->dentry; @@ -130,6 +147,14 @@ int ovl_copy_xattr(struct super_block *sb, const struct path *oldpath, struct de break; } + if (is_fscaps_xattr(name)) { + error = ovl_copy_fscaps(OVL_FS(sb), oldpath, new); + if (!error) + continue; + /* fs capabilities must be copied */ + break; + } + retry: size = ovl_do_getxattr(oldpath, name, value, value_size); if (size == -ERANGE) @@ -1039,61 +1064,40 @@ static bool ovl_need_meta_copy_up(struct dentry *dentry, umode_t mode, return true; } -static ssize_t ovl_getxattr_value(const struct path *path, char *name, char **value) -{ - ssize_t res; - char *buf; - - res = ovl_do_getxattr(path, name, NULL, 0); - if (res == -ENODATA || res == -EOPNOTSUPP) - res = 0; - - if (res > 0) { - buf = kzalloc(res, GFP_KERNEL); - if (!buf) - return -ENOMEM; - - res = ovl_do_getxattr(path, name, buf, res); - if (res < 0) - kfree(buf); - else - *value = buf; - } - return res; -} - /* Copy up data of an inode which was copied up metadata only in the past. */ static int ovl_copy_up_meta_inode_data(struct ovl_copy_up_ctx *c) { struct ovl_fs *ofs = OVL_FS(c->dentry->d_sb); struct path upperpath; int err; - char *capability = NULL; - ssize_t cap_size; + struct vfs_caps capability; + bool has_capability = false; ovl_path_upper(c->dentry, &upperpath); if (WARN_ON(upperpath.dentry == NULL)) return -EIO; if (c->stat.size) { - err = cap_size = ovl_getxattr_value(&upperpath, XATTR_NAME_CAPS, - &capability); - if (cap_size < 0) + err = vfs_get_fscaps(mnt_idmap(upperpath.mnt), upperpath.dentry, + &capability); + if (!err) + has_capability = 1; + else if (err != -ENODATA && err != EOPNOTSUPP) goto out; } err = ovl_copy_up_data(c, &upperpath); if (err) - goto out_free; + goto out; /* * Writing to upper file will clear security.capability xattr. We * don't want that to happen for normal copy-up operation. */ ovl_start_write(c->dentry); - if (capability) { - err = ovl_do_setxattr(ofs, upperpath.dentry, XATTR_NAME_CAPS, - capability, cap_size, 0); + if (has_capability) { + err = vfs_set_fscaps(mnt_idmap(upperpath.mnt), upperpath.dentry, + &capability, 0); } if (!err) { err = ovl_removexattr(ofs, upperpath.dentry, @@ -1101,13 +1105,11 @@ static int ovl_copy_up_meta_inode_data(struct ovl_copy_up_ctx *c) } ovl_end_write(c->dentry); if (err) - goto out_free; + goto out; ovl_clear_flag(OVL_HAS_DIGEST, d_inode(c->dentry)); ovl_clear_flag(OVL_VERIFIED_DIGEST, d_inode(c->dentry)); ovl_set_upperdata(d_inode(c->dentry)); -out_free: - kfree(capability); out: return err; } -- 2.43.0
