{
int res;
char *buf;
+ struct ovl_fs *ofs = OVL_FS(d->sb);
- buf = ovl_get_redirect_xattr(dentry, prelen + strlen(post));
+ buf = ovl_get_redirect_xattr(ofs, dentry, prelen + strlen(post));
if (IS_ERR_OR_NULL(buf))
return PTR_ERR(buf);
return 0;
}
-static struct ovl_fh *ovl_get_fh(struct dentry *dentry, const char *name)
+static struct ovl_fh *ovl_get_fh(struct ovl_fs *ofs, struct dentry *dentry,
+ enum ovl_xattr ox)
{
int res, err;
struct ovl_fh *fh = NULL;
- res = vfs_getxattr(dentry, name, NULL, 0);
+ res = ovl_do_getxattr(ofs, dentry, ox, NULL, 0);
if (res < 0) {
if (res == -ENODATA || res == -EOPNOTSUPP)
return NULL;
if (!fh)
return ERR_PTR(-ENOMEM);
- res = vfs_getxattr(dentry, name, fh->buf, res);
+ res = ovl_do_getxattr(ofs, dentry, ox, fh->buf, res);
if (res < 0)
goto fail;
goto out;
}
-struct dentry *ovl_decode_real_fh(struct ovl_fh *fh, struct vfsmount *mnt,
- bool connected)
+struct dentry *ovl_decode_real_fh(struct ovl_fs *ofs, struct ovl_fh *fh,
+ struct vfsmount *mnt, bool connected)
{
struct dentry *real;
int bytes;
+ if (!capable(CAP_DAC_READ_SEARCH))
+ return NULL;
+
/*
* Make sure that the stored uuid matches the uuid of the lower
* layer where file handle will be decoded.
+ * In case of uuid=off option just make sure that stored uuid is null.
*/
- if (!uuid_equal(&fh->fb.uuid, &mnt->mnt_sb->s_uuid))
+ if (ofs->config.uuid ? !uuid_equal(&fh->fb.uuid, &mnt->mnt_sb->s_uuid) :
+ !uuid_is_null(&fh->fb.uuid))
return NULL;
bytes = (fh->fb.len - offsetof(struct ovl_fb, fid));
return real;
}
-static bool ovl_is_opaquedir(struct dentry *dentry)
+static bool ovl_is_opaquedir(struct super_block *sb, struct dentry *dentry)
{
- return ovl_check_dir_xattr(dentry, OVL_XATTR_OPAQUE);
+ return ovl_check_dir_xattr(sb, dentry, OVL_XATTR_OPAQUE);
}
static struct dentry *ovl_lookup_positive_unlocked(const char *name,
d->stop = true;
goto put_and_out;
}
- err = ovl_check_metacopy_xattr(this);
+ err = ovl_check_metacopy_xattr(OVL_FS(d->sb), this);
if (err < 0)
goto out_err;
if (d->last)
goto out;
- if (ovl_is_opaquedir(this)) {
+ if (ovl_is_opaquedir(d->sb, this)) {
d->stop = true;
if (last_element)
d->opaque = true;
ofs->layers[i].fs->bad_uuid)
continue;
- origin = ovl_decode_real_fh(fh, ofs->layers[i].mnt,
+ origin = ovl_decode_real_fh(ofs, fh, ofs->layers[i].mnt,
connected);
if (origin)
break;
static int ovl_check_origin(struct ovl_fs *ofs, struct dentry *upperdentry,
struct ovl_path **stackp)
{
- struct ovl_fh *fh = ovl_get_fh(upperdentry, OVL_XATTR_ORIGIN);
+ struct ovl_fh *fh = ovl_get_fh(ofs, upperdentry, OVL_XATTR_ORIGIN);
int err;
if (IS_ERR_OR_NULL(fh))
* Verify that @fh matches the file handle stored in xattr @name.
* Return 0 on match, -ESTALE on mismatch, < 0 on error.
*/
-static int ovl_verify_fh(struct dentry *dentry, const char *name,
- const struct ovl_fh *fh)
+static int ovl_verify_fh(struct ovl_fs *ofs, struct dentry *dentry,
+ enum ovl_xattr ox, const struct ovl_fh *fh)
{
- struct ovl_fh *ofh = ovl_get_fh(dentry, name);
+ struct ovl_fh *ofh = ovl_get_fh(ofs, dentry, ox);
int err = 0;
if (!ofh)
*
* Return 0 on match, -ESTALE on mismatch, -ENODATA on no xattr, < 0 on error.
*/
-int ovl_verify_set_fh(struct dentry *dentry, const char *name,
- struct dentry *real, bool is_upper, bool set)
+int ovl_verify_set_fh(struct ovl_fs *ofs, struct dentry *dentry,
+ enum ovl_xattr ox, struct dentry *real, bool is_upper,
+ bool set)
{
struct inode *inode;
struct ovl_fh *fh;
int err;
- fh = ovl_encode_real_fh(real, is_upper);
+ fh = ovl_encode_real_fh(ofs, real, is_upper);
err = PTR_ERR(fh);
if (IS_ERR(fh)) {
fh = NULL;
goto fail;
}
- err = ovl_verify_fh(dentry, name, fh);
+ err = ovl_verify_fh(ofs, dentry, ox, fh);
if (set && err == -ENODATA)
- err = ovl_do_setxattr(dentry, name, fh->buf, fh->fb.len, 0);
+ err = ovl_do_setxattr(ofs, dentry, ox, fh->buf, fh->fb.len);
if (err)
goto fail;
if (!d_is_dir(index))
return dget(index);
- fh = ovl_get_fh(index, OVL_XATTR_UPPER);
+ fh = ovl_get_fh(ofs, index, OVL_XATTR_UPPER);
if (IS_ERR_OR_NULL(fh))
return ERR_CAST(fh);
- upper = ovl_decode_real_fh(fh, ovl_upper_mnt(ofs), true);
+ upper = ovl_decode_real_fh(ofs, fh, ovl_upper_mnt(ofs), true);
kfree(fh);
if (IS_ERR_OR_NULL(upper))
goto fail;
}
- err = ovl_verify_fh(upper, OVL_XATTR_ORIGIN, fh);
+ err = ovl_verify_fh(ofs, upper, OVL_XATTR_ORIGIN, fh);
dput(upper);
if (err)
goto fail;
if (err)
goto fail;
- if (ovl_get_nlink(origin.dentry, index, 0) == 0)
+ if (ovl_get_nlink(ofs, origin.dentry, index, 0) == 0)
goto orphan;
}
* index dir was cleared. Either way, that index cannot be used to indentify
* the overlay inode.
*/
-int ovl_get_index_name(struct dentry *origin, struct qstr *name)
+int ovl_get_index_name(struct ovl_fs *ofs, struct dentry *origin,
+ struct qstr *name)
{
struct ovl_fh *fh;
int err;
- fh = ovl_encode_real_fh(origin, false);
+ fh = ovl_encode_real_fh(ofs, origin, false);
if (IS_ERR(fh))
return PTR_ERR(fh);
bool is_dir = d_is_dir(origin);
int err;
- err = ovl_get_index_name(origin, &name);
+ err = ovl_get_index_name(ofs, origin, &name);
if (err)
return ERR_PTR(err);
}
/* Verify that dir index 'upper' xattr points to upper dir */
- err = ovl_verify_upper(index, upper, false);
+ err = ovl_verify_upper(ofs, index, upper, false);
if (err) {
if (err == -ESTALE) {
pr_warn_ratelimited("suspected multiply redirected dir found (upper=%pd2, origin=%pd2, index=%pd2).\n",
}
/* Fix missing 'origin' xattr */
-static int ovl_fix_origin(struct dentry *dentry, struct dentry *lower,
- struct dentry *upper)
+static int ovl_fix_origin(struct ovl_fs *ofs, struct dentry *dentry,
+ struct dentry *lower, struct dentry *upper)
{
int err;
- if (ovl_check_origin_xattr(upper))
+ if (ovl_check_origin_xattr(ofs, upper))
return 0;
err = ovl_want_write(dentry);
if (err)
return err;
- err = ovl_set_origin(dentry, lower, upper);
+ err = ovl_set_origin(ofs, dentry, lower, upper);
if (!err)
err = ovl_set_impure(dentry->d_parent, upper->d_parent);
* of lower dir and set upper parent "impure".
*/
if (upperdentry && !ctr && !ofs->noxattr && d.is_dir) {
- err = ovl_fix_origin(dentry, this, upperdentry);
+ err = ovl_fix_origin(ofs, dentry, this, upperdentry);
if (err) {
dput(this);
goto out_put;
if (upperdentry && !ctr &&
((d.is_dir && ovl_verify_lower(dentry->d_sb)) ||
(!d.is_dir && ofs->config.index && origin_path))) {
- err = ovl_verify_origin(upperdentry, this, false);
+ err = ovl_verify_origin(ofs, upperdentry, this, false);
if (err) {
dput(this);
if (d.is_dir)
* Just make sure a corresponding data dentry has been found.
*/
if (d.metacopy || (uppermetacopy && !ctr)) {
+ pr_warn_ratelimited("metacopy with no lower data found - abort lookup (%pd2)\n",
+ dentry);
err = -EIO;
goto out_put;
} else if (!d.is_dir && upperdentry && !ctr && origin_path) {
ovl_dentry_set_upper_alias(dentry);
else if (index) {
upperdentry = dget(index);
- upperredirect = ovl_get_redirect_xattr(upperdentry, 0);
+ upperredirect = ovl_get_redirect_xattr(ofs, upperdentry, 0);
if (IS_ERR(upperredirect)) {
err = PTR_ERR(upperredirect);
upperredirect = NULL;
goto out_free_oe;
}
- err = ovl_check_metacopy_xattr(upperdentry);
+ err = ovl_check_metacopy_xattr(ofs, upperdentry);
if (err < 0)
goto out_free_oe;
uppermetacopy = err;
projects / linux-2.6-microblaze.git / blobdiff